add subscriptions; change persistence file format to JSON (closes #901, #76, #113, #170, #242, #444, #503, #555, #566)

Allow users to prefer a specific video codec (H.264, H.265, AV1, VP9)
when adding downloads. The selector filters available formats via
yt-dlp format strings, falling back to best available if the preferred
codec is not found. The completed downloads table now shows Quality
and Codec columns.

.github/workflows/main.yml

@@ -6,38 +6,80 @@ on:
       - 'master'
 
 jobs:
+  quality-checks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: lts/*
+      - name: Enable pnpm
+        run: corepack enable
+      - name: Install frontend dependencies
+        working-directory: ui
+        run: pnpm install --frozen-lockfile
+      - name: Run frontend lint
+        working-directory: ui
+        run: pnpm run lint
+      - name: Build frontend
+        working-directory: ui
+        run: pnpm run build
+      - name: Run frontend tests
+        working-directory: ui
+        run: pnpm exec ng test --watch=false
+        env:
+          CI: true
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
+      - name: Install Python dependencies
+        run: uv sync --frozen --group dev
+      - name: Run backend smoke checks
+        run: python -m compileall app
+      - name: Run backend tests
+        run: uv run pytest app/tests/
+      - name: Run Trivy filesystem scan
+        uses: aquasecurity/trivy-action@0.35.0
+        with:
+          scan-type: fs
+          scan-ref: .
+          format: table
+          severity: CRITICAL,HIGH
+
   dockerhub-build-push:
+    needs: quality-checks
     runs-on: ubuntu-latest
     steps:
       -
         name: Get current date
         id: date
-        run: echo "::set-output name=date::$(date +'%Y.%m.%d')"
+        run: echo "date=$(date +'%Y.%m.%d')" >> "$GITHUB_OUTPUT"
       -
         name: Checkout
         uses: actions/checkout@v6
       -
         name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
       -
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       -
         name: Login to DockerHub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       -
         name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
       -
         name: Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           platforms: linux/amd64,linux/arm64

Dockerfile

@@ -26,15 +26,12 @@ RUN sed -i 's/\r$//g' docker-entrypoint.sh && \
       gosu \
       curl \
       tini \
-      file \
-      gdbmtool \
-      sqlite3 \
       build-essential && \
     curl -LsSf https://astral.sh/uv/install.sh | UV_INSTALL_DIR=/usr/local/bin sh && \
     UV_PROJECT_ENVIRONMENT=/usr/local uv sync --frozen --no-dev --compile-bytecode && \
     uv cache clean && \
     rm -f /usr/local/bin/uv /usr/local/bin/uvx /usr/local/bin/uvw && \
-    curl -fsSL https://deno.land/install.sh | DENO_INSTALL=/usr/local sh -s -- -y v2.7.2 && \
+    curl -fsSL https://deno.land/install.sh | DENO_INSTALL=/usr/local sh -s -- -y && \
     apt-get purge -y --auto-remove build-essential && \
     rm -rf /var/lib/apt/lists/* && \
     mkdir /.cache && chmod 777 /.cache
@@ -63,11 +60,12 @@ ENV PUID=1000
 ENV PGID=1000
 ENV UMASK=022
 
-ENV DOWNLOAD_DIR /downloads
-ENV STATE_DIR /downloads/.metube
-ENV TEMP_DIR /downloads
+ENV DOWNLOAD_DIR=/downloads
+ENV STATE_DIR=/downloads/.metube
+ENV TEMP_DIR=/downloads
 VOLUME /downloads
 EXPOSE 8081
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 CMD curl -fsS "http://localhost:8081/" || exit 1
 
 # Add build-time argument for version
 ARG VERSION=dev

README.md

@@ -36,6 +36,9 @@ Certain values can be set via environment variables, using the `-e` parameter on
 * __MAX_CONCURRENT_DOWNLOADS__: Maximum number of simultaneous downloads allowed. For example, if set to `5`, then at most five downloads will run concurrently, and any additional downloads will wait until one of the active downloads completes. Defaults to `3`. 
 * __DELETE_FILE_ON_TRASHCAN__: if `true`, downloaded files are deleted on the server, when they are trashed from the "Completed" section of the UI. Defaults to `false`.
 * __DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT__: Maximum number of playlist items that can be downloaded. Defaults to `0` (no limit).
+* __SUBSCRIPTION_DEFAULT_CHECK_INTERVAL__: Default minutes between automatic checks for each subscription. Defaults to `60`.
+* __SUBSCRIPTION_SCAN_PLAYLIST_END__: Maximum playlist/channel entries to fetch per subscription check (newest-first). Defaults to `50`.
+* __SUBSCRIPTION_MAX_SEEN_IDS__: Cap on stored video IDs per subscription to limit state file growth. Defaults to `50000`.
 * __CLEAR_COMPLETED_AFTER__: Number of seconds after which completed (and failed) downloads are automatically removed from the "Completed" list. Defaults to `0` (disabled).
 
 ### 📁 Storage & Directories
@@ -46,7 +49,7 @@ Certain values can be set via environment variables, using the `-e` parameter on
 * __CREATE_CUSTOM_DIRS__: Whether to support automatically creating directories within the __DOWNLOAD_DIR__ (or __AUDIO_DOWNLOAD_DIR__) if they do not exist. When enabled, the download directory selector supports free-text input, and the specified directory will be created recursively. Defaults to `true`.
 * __CUSTOM_DIRS_EXCLUDE_REGEX__: Regular expression to exclude some custom directories from the dropdown. Empty regex disables exclusion. Defaults to `(^|/)[.@].*$`, which means directories starting with `.` or `@`.
 * __DOWNLOAD_DIRS_INDEXABLE__: If `true`, the download directories (__DOWNLOAD_DIR__ and __AUDIO_DOWNLOAD_DIR__) are indexable on the web server. Defaults to `false`.
-* __STATE_DIR__: Path to where the queue persistence files will be saved. Defaults to `/downloads/.metube` in the Docker image, and `.` otherwise.
+* __STATE_DIR__: Path to where MeTube will store its persistent state files (`queue.json`, `pending.json`, `completed.json`, `subscriptions.json`). Defaults to `/downloads/.metube` in the Docker image, and `.` otherwise.
 * __TEMP_DIR__: Path where intermediary download files will be saved. Defaults to `/downloads` in the Docker image, and `.` otherwise.
   * Set this to an SSD or RAM filesystem (e.g., `tmpfs`) for better performance.
   * __Note__: Using a RAM filesystem may prevent downloads from being resumed.

app/dl_formats.py

@@ -3,6 +3,13 @@ import copy
 AUDIO_FORMATS = ("m4a", "mp3", "opus", "wav", "flac")
 CAPTION_MODES = ("auto_only", "manual_only", "prefer_manual", "prefer_auto")
 
+CODEC_FILTER_MAP = {
+    'h264': "[vcodec~='^(h264|avc)']",
+    'h265': "[vcodec~='^(h265|hevc)']",
+    'av1':  "[vcodec~='^av0?1']",
+    'vp9':  "[vcodec~='^vp0?9']",
+}
+
 
 def _normalize_caption_mode(mode: str) -> str:
     mode = (mode or "").strip()
@@ -14,84 +21,88 @@ def _normalize_subtitle_language(language: str) -> str:
     return language or "en"
 
 
-def get_format(format: str, quality: str) -> str:
+def get_format(download_type: str, codec: str, format: str, quality: str) -> str:
     """
-    Returns format for download
+    Returns yt-dlp format selector.
 
     Args:
-      format (str): format selected
-      quality (str): quality selected
+      download_type (str): selected content type (video, audio, captions, thumbnail)
+      codec (str): selected video codec (auto, h264, h265, av1, vp9)
+      format (str): selected output format/profile for type
+      quality (str): selected quality
 
     Raises:
-      Exception: unknown quality, unknown format
+      Exception: unknown type/format
 
     Returns:
-      dl_format: Formatted download string
+      str: yt-dlp format selector
     """
-    format = format or "any"
+    download_type = (download_type or "video").strip().lower()
+    format = (format or "any").strip().lower()
+    codec = (codec or "auto").strip().lower()
+    quality = (quality or "best").strip().lower()
 
     if format.startswith("custom:"):
         return format[7:]
 
-    if format == "thumbnail":
-        # Quality is irrelevant in this case since we skip the download
+    if download_type == "thumbnail":
         return "bestaudio/best"
 
-    if format == "captions":
-        # Quality is irrelevant in this case since we skip the download
+    if download_type == "captions":
         return "bestaudio/best"
 
-    if format in AUDIO_FORMATS:
-        # Audio quality needs to be set post-download, set in opts
+    if download_type == "audio":
+        if format not in AUDIO_FORMATS:
+            raise ValueError(f"Unknown audio format {format}")
         return f"bestaudio[ext={format}]/bestaudio/best"
 
-    if format in ("mp4", "any"):
-        if quality == "audio":
-            return "bestaudio/best"
-        # video {res} {vfmt} + audio {afmt} {res} {vfmt}
-        vfmt, afmt = ("[ext=mp4]", "[ext=m4a]") if format == "mp4" else ("", "")
-        vres = f"[height<={quality}]" if quality not in ("best", "best_ios", "worst") else ""
+    if download_type == "video":
+        if format not in ("any", "mp4", "ios"):
+            raise ValueError(f"Unknown video format {format}")
+        vfmt, afmt = ("[ext=mp4]", "[ext=m4a]") if format in ("mp4", "ios") else ("", "")
+        vres = f"[height<={quality}]" if quality not in ("best", "worst") else ""
         vcombo = vres + vfmt
+        codec_filter = CODEC_FILTER_MAP.get(codec, "")
 
-        if quality == "best_ios":
-            # iOS has strict requirements for video files, requiring h264 or h265
-            # video codec and aac audio codec in MP4 container. This format string
-            # attempts to get the fully compatible formats first, then the h264/h265
-            # video codec with any M4A audio codec (because audio is faster to
-            # convert if needed), and falls back to getting the best available MP4
-            # file.
+        if format == "ios":
             return f"bestvideo[vcodec~='^((he|a)vc|h26[45])']{vres}+bestaudio[acodec=aac]/bestvideo[vcodec~='^((he|a)vc|h26[45])']{vres}+bestaudio{afmt}/bestvideo{vcombo}+bestaudio{afmt}/best{vcombo}"
+
+        if codec_filter:
+            return f"bestvideo{codec_filter}{vcombo}+bestaudio{afmt}/bestvideo{vcombo}+bestaudio{afmt}/best{vcombo}"
         return f"bestvideo{vcombo}+bestaudio{afmt}/best{vcombo}"
 
-    raise Exception(f"Unkown format {format}")
+    raise ValueError(f"Unknown download_type {download_type}")
 
 
 def get_opts(
+    download_type: str,
+    _codec: str,
     format: str,
     quality: str,
     ytdl_opts: dict,
-    subtitle_format: str = "srt",
     subtitle_language: str = "en",
     subtitle_mode: str = "prefer_manual",
 ) -> dict:
     """
-    Returns extra download options
-    Mostly postprocessing options
+    Returns extra yt-dlp options/postprocessors.
 
     Args:
-      format (str): format selected
-      quality (str): quality of format selected (needed for some formats)
+      download_type (str): selected content type
+      codec (str): selected codec (unused currently, kept for API consistency)
+      format (str): selected format/profile
+      quality (str): selected quality
       ytdl_opts (dict): current options selected
 
     Returns:
-      ytdl_opts: Extra options
+      dict: extended options
     """
-
+    download_type = (download_type or "video").strip().lower()
+    format = (format or "any").strip().lower()
     opts = copy.deepcopy(ytdl_opts)
 
     postprocessors = []
 
-    if format in AUDIO_FORMATS:
+    if download_type == "audio":
         postprocessors.append(
             {
                 "key": "FFmpegExtractAudio",
@@ -100,8 +111,7 @@ def get_opts(
             }
         )
 
-        # Audio formats without thumbnail
-        if format not in ("wav") and "writethumbnail" not in opts:
+        if format != "wav" and "writethumbnail" not in opts:
             opts["writethumbnail"] = True
             postprocessors.append(
                 {
@@ -113,19 +123,18 @@ def get_opts(
             postprocessors.append({"key": "FFmpegMetadata"})
             postprocessors.append({"key": "EmbedThumbnail"})
 
-    if format == "thumbnail":
+    if download_type == "thumbnail":
         opts["skip_download"] = True
         opts["writethumbnail"] = True
         postprocessors.append(
             {"key": "FFmpegThumbnailsConvertor", "format": "jpg", "when": "before_dl"}
         )
 
-    if format == "captions":
+    if download_type == "captions":
         mode = _normalize_caption_mode(subtitle_mode)
         language = _normalize_subtitle_language(subtitle_language)
         opts["skip_download"] = True
-        requested_subtitle_format = (subtitle_format or "srt").lower()
-        # txt is a derived, non-timed format produced from SRT after download.
+        requested_subtitle_format = (format or "srt").lower()
         if requested_subtitle_format == "txt":
             requested_subtitle_format = "srt"
         opts["subtitlesformat"] = requested_subtitle_format

app/main.py

@@ -16,25 +16,16 @@ import pathlib
 import re
 from watchfiles import DefaultFilter, Change, awatch
 
-from ytdl import DownloadQueueNotifier, DownloadQueue
+from ytdl import DownloadQueueNotifier, DownloadQueue, Download
+from subscriptions import SubscriptionManager, SubscriptionNotifier, SubscriptionInfo
 from yt_dlp.version import __version__ as yt_dlp_version
 
 log = logging.getLogger('main')
 
 def parseLogLevel(logLevel):
-    match logLevel:
-        case 'DEBUG':
-            return logging.DEBUG
-        case 'INFO':
-            return logging.INFO
-        case 'WARNING':
-            return logging.WARNING
-        case 'ERROR':
-            return logging.ERROR
-        case 'CRITICAL':
-            return logging.CRITICAL
-        case _:
-            return None
+    if not isinstance(logLevel, str):
+        return None
+    return getattr(logging, logLevel.upper(), None)
 
 # Configure logging before Config() uses it so early messages are not dropped.
 # Only configure if no handlers are set (avoid clobbering hosting app settings).
@@ -60,6 +51,9 @@ class Config:
         'OUTPUT_TEMPLATE_PLAYLIST': '%(playlist_title)s/%(title)s.%(ext)s',
         'OUTPUT_TEMPLATE_CHANNEL': '%(channel)s/%(title)s.%(ext)s',
         'DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT' : '0',
+        'SUBSCRIPTION_DEFAULT_CHECK_INTERVAL': '60',
+        'SUBSCRIPTION_SCAN_PLAYLIST_END': '50',
+        'SUBSCRIPTION_MAX_SEEN_IDS': '50000',
         'CLEAR_COMPLETED_AFTER': '0',
         'YTDL_OPTIONS': '{}',
         'YTDL_OPTIONS_FILE': '',
@@ -71,7 +65,7 @@ class Config:
         'KEYFILE': '',
         'BASE_DIR': '',
         'DEFAULT_THEME': 'auto',
-        'MAX_CONCURRENT_DOWNLOADS': 3,
+        'MAX_CONCURRENT_DOWNLOADS': '3',
         'LOGLEVEL': 'INFO',
         'ENABLE_ACCESSLOG': 'false',
     }
@@ -124,6 +118,7 @@ class Config:
         'PUBLIC_HOST_URL',
         'PUBLIC_HOST_AUDIO_URL',
         'DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT',
+        'SUBSCRIPTION_DEFAULT_CHECK_INTERVAL',
     )
 
     def frontend_safe(self) -> dict:
@@ -181,7 +176,7 @@ class ObjectSerializer(json.JSONEncoder):
         elif hasattr(obj, '__iter__') and not isinstance(obj, (str, bytes)):
             try:
                 return list(obj)
-            except:
+            except Exception:
                 pass
         # Fall back to default behavior
         return json.JSONEncoder.default(self, obj)
@@ -194,6 +189,68 @@ routes = web.RouteTableDef()
 VALID_SUBTITLE_FORMATS = {'srt', 'txt', 'vtt', 'ttml', 'sbv', 'scc', 'dfxp'}
 VALID_SUBTITLE_MODES = {'auto_only', 'manual_only', 'prefer_manual', 'prefer_auto'}
 SUBTITLE_LANGUAGE_RE = re.compile(r'^[A-Za-z0-9][A-Za-z0-9-]{0,34}$')
+VALID_DOWNLOAD_TYPES = {'video', 'audio', 'captions', 'thumbnail'}
+VALID_VIDEO_CODECS = {'auto', 'h264', 'h265', 'av1', 'vp9'}
+VALID_VIDEO_FORMATS = {'any', 'mp4', 'ios'}
+VALID_AUDIO_FORMATS = {'m4a', 'mp3', 'opus', 'wav', 'flac'}
+VALID_THUMBNAIL_FORMATS = {'jpg'}
+
+
+def _migrate_legacy_request(post: dict) -> dict:
+    """
+    BACKWARD COMPATIBILITY: Translate old API request schema into the new one.
+
+    Old API:
+      format (any/mp4/m4a/mp3/opus/wav/flac/thumbnail/captions)
+      quality
+      video_codec
+      subtitle_format (only when format=captions)
+
+    New API:
+      download_type (video/audio/captions/thumbnail)
+      codec
+      format
+      quality
+    """
+    if "download_type" in post:
+        return post
+
+    old_format = str(post.get("format") or "any").strip().lower()
+    old_quality = str(post.get("quality") or "best").strip().lower()
+    old_video_codec = str(post.get("video_codec") or "auto").strip().lower()
+
+    if old_format in VALID_AUDIO_FORMATS:
+        post["download_type"] = "audio"
+        post["codec"] = "auto"
+        post["format"] = old_format
+    elif old_format == "thumbnail":
+        post["download_type"] = "thumbnail"
+        post["codec"] = "auto"
+        post["format"] = "jpg"
+        post["quality"] = "best"
+    elif old_format == "captions":
+        post["download_type"] = "captions"
+        post["codec"] = "auto"
+        post["format"] = str(post.get("subtitle_format") or "srt").strip().lower()
+        post["quality"] = "best"
+    else:
+        # old_format is usually any/mp4 (legacy video path)
+        post["download_type"] = "video"
+        post["codec"] = old_video_codec
+        if old_quality == "best_ios":
+            post["format"] = "ios"
+            post["quality"] = "best"
+        elif old_quality == "audio":
+            # Legacy "audio only" under video format maps to m4a audio.
+            post["download_type"] = "audio"
+            post["codec"] = "auto"
+            post["format"] = "m4a"
+            post["quality"] = "best"
+        else:
+            post["format"] = old_format
+            post["quality"] = old_quality
+
+    return post
 
 class Notifier(DownloadQueueNotifier):
     async def added(self, dl):
@@ -218,6 +275,35 @@ class Notifier(DownloadQueueNotifier):
 
 dqueue = DownloadQueue(config, Notifier())
 app.on_startup.append(lambda app: dqueue.initialize())
+app.on_cleanup.append(lambda app: Download.shutdown_manager())
+
+
+class MetubeSubscriptionNotifier(SubscriptionNotifier):
+    async def subscription_added(self, sub: SubscriptionInfo):
+        log.info("Subscription added: %s", sub.name)
+        await sio.emit('subscription_added', serializer.encode(sub.to_public_dict()))
+
+    async def subscription_updated(self, sub: SubscriptionInfo):
+        await sio.emit('subscription_updated', serializer.encode(sub.to_public_dict()))
+
+    async def subscription_removed(self, sub_id: str):
+        log.info("Subscription removed: %s", sub_id)
+        await sio.emit('subscription_removed', serializer.encode(sub_id))
+
+    async def subscriptions_all(self, subs: list[SubscriptionInfo]):
+        await sio.emit('subscriptions_all', serializer.encode([s.to_public_dict() for s in subs]))
+
+
+submgr = SubscriptionManager(config, dqueue, MetubeSubscriptionNotifier())
+app.on_cleanup.append(lambda app: submgr.close())
+
+
+async def _subscription_loop_startup(app):
+    """aiohttp on_startup requires awaitable receivers; start_background_loop is sync."""
+    submgr.start_background_loop()
+
+
+app.on_startup.append(_subscription_loop_startup)
 
 class FileOpsFilter(DefaultFilter):
     def __call__(self, change_type: int, path: str) -> bool:
@@ -268,24 +354,34 @@ async def watch_files():
 if config.YTDL_OPTIONS_FILE:
     app.on_startup.append(lambda app: watch_files())
 
-@routes.post(config.URL_PREFIX + 'add')
-async def add(request):
-    log.info("Received request to add download")
-    post = await request.json()
-    log.info(f"Request data: {post}")
+
+async def _read_json_request(request: web.Request) -> dict:
+    try:
+        post = await request.json()
+    except json.JSONDecodeError as exc:
+        raise web.HTTPBadRequest(reason='Invalid JSON request body') from exc
+    if not isinstance(post, dict):
+        raise web.HTTPBadRequest(reason='JSON request body must be an object')
+    return post
+
+
+def parse_download_options(post: dict) -> dict:
+    """Validate add/subscribe body; raise HTTPBadRequest on invalid input."""
+    post = _migrate_legacy_request(dict(post))
     url = post.get('url')
-    quality = post.get('quality')
-    if not url or not quality:
-        log.error("Bad request: missing 'url' or 'quality'")
-        raise web.HTTPBadRequest()
+    download_type = post.get('download_type')
+    codec = post.get('codec')
     format = post.get('format')
+    quality = post.get('quality')
+    if not url or not quality or not download_type:
+        raise web.HTTPBadRequest(reason="missing 'url', 'download_type', or 'quality'")
+    url = str(url).strip()
     folder = post.get('folder')
     custom_name_prefix = post.get('custom_name_prefix')
     playlist_item_limit = post.get('playlist_item_limit')
     auto_start = post.get('auto_start')
     split_by_chapters = post.get('split_by_chapters')
     chapter_template = post.get('chapter_template')
-    subtitle_format = post.get('subtitle_format')
     subtitle_language = post.get('subtitle_language')
     subtitle_mode = post.get('subtitle_mode')
 
@@ -301,39 +397,109 @@ async def add(request):
         split_by_chapters = False
     if chapter_template is None:
         chapter_template = config.OUTPUT_TEMPLATE_CHAPTER
-    if subtitle_format is None:
-        subtitle_format = 'srt'
     if subtitle_language is None:
         subtitle_language = 'en'
     if subtitle_mode is None:
         subtitle_mode = 'prefer_manual'
-    subtitle_format = str(subtitle_format).strip().lower()
+    download_type = str(download_type).strip().lower()
+    codec = str(codec or 'auto').strip().lower()
+    format = str(format or '').strip().lower()
+    quality = str(quality).strip().lower()
     subtitle_language = str(subtitle_language).strip()
     subtitle_mode = str(subtitle_mode).strip()
+
     if chapter_template and ('..' in chapter_template or chapter_template.startswith('/') or chapter_template.startswith('\\')):
         raise web.HTTPBadRequest(reason='chapter_template must not contain ".." or start with a path separator')
-    if subtitle_format not in VALID_SUBTITLE_FORMATS:
-        raise web.HTTPBadRequest(reason=f'subtitle_format must be one of {sorted(VALID_SUBTITLE_FORMATS)}')
     if not SUBTITLE_LANGUAGE_RE.fullmatch(subtitle_language):
         raise web.HTTPBadRequest(reason='subtitle_language must match pattern [A-Za-z0-9-] and be at most 35 characters')
     if subtitle_mode not in VALID_SUBTITLE_MODES:
         raise web.HTTPBadRequest(reason=f'subtitle_mode must be one of {sorted(VALID_SUBTITLE_MODES)}')
 
-    playlist_item_limit = int(playlist_item_limit)
+    if download_type not in VALID_DOWNLOAD_TYPES:
+        raise web.HTTPBadRequest(reason=f'download_type must be one of {sorted(VALID_DOWNLOAD_TYPES)}')
+    if codec not in VALID_VIDEO_CODECS:
+        raise web.HTTPBadRequest(reason=f'codec must be one of {sorted(VALID_VIDEO_CODECS)}')
 
+    if download_type == 'video':
+        if format not in VALID_VIDEO_FORMATS:
+            raise web.HTTPBadRequest(reason=f'format must be one of {sorted(VALID_VIDEO_FORMATS)} for video')
+        if quality not in {'best', 'worst', '2160', '1440', '1080', '720', '480', '360', '240'}:
+            raise web.HTTPBadRequest(reason="quality must be one of ['best', '2160', '1440', '1080', '720', '480', '360', '240', 'worst'] for video")
+    elif download_type == 'audio':
+        if format not in VALID_AUDIO_FORMATS:
+            raise web.HTTPBadRequest(reason=f'format must be one of {sorted(VALID_AUDIO_FORMATS)} for audio')
+        allowed_audio_qualities = {'best'}
+        if format == 'mp3':
+            allowed_audio_qualities |= {'320', '192', '128'}
+        elif format == 'm4a':
+            allowed_audio_qualities |= {'192', '128'}
+        if quality not in allowed_audio_qualities:
+            raise web.HTTPBadRequest(reason=f'quality must be one of {sorted(allowed_audio_qualities)} for format {format}')
+        codec = 'auto'
+    elif download_type == 'captions':
+        if format not in VALID_SUBTITLE_FORMATS:
+            raise web.HTTPBadRequest(reason=f'format must be one of {sorted(VALID_SUBTITLE_FORMATS)} for captions')
+        quality = 'best'
+        codec = 'auto'
+    elif download_type == 'thumbnail':
+        if format not in VALID_THUMBNAIL_FORMATS:
+            raise web.HTTPBadRequest(reason=f'format must be one of {sorted(VALID_THUMBNAIL_FORMATS)} for thumbnail')
+        quality = 'best'
+        codec = 'auto'
+
+    try:
+        playlist_item_limit = int(playlist_item_limit)
+    except (TypeError, ValueError) as exc:
+        raise web.HTTPBadRequest(reason='playlist_item_limit must be an integer') from exc
+
+    return {
+        'url': url,
+        'download_type': download_type,
+        'codec': codec,
+        'format': format,
+        'quality': quality,
+        'folder': folder,
+        'custom_name_prefix': custom_name_prefix,
+        'playlist_item_limit': playlist_item_limit,
+        'auto_start': auto_start,
+        'split_by_chapters': split_by_chapters,
+        'chapter_template': chapter_template,
+        'subtitle_language': subtitle_language,
+        'subtitle_mode': subtitle_mode,
+    }
+
+
+@routes.post(config.URL_PREFIX + 'add')
+async def add(request):
+    log.info("Received request to add download")
+    post = await _read_json_request(request)
+    try:
+        o = parse_download_options(post)
+    except web.HTTPBadRequest as e:
+        log.error("Bad request: %s", e.reason)
+        raise
+    log.info(
+        "Add download request: type=%s quality=%s format=%s has_folder=%s auto_start=%s",
+        o['download_type'],
+        o['quality'],
+        o['format'],
+        bool(o.get('folder')),
+        o['auto_start'],
+    )
     status = await dqueue.add(
-        url,
-        quality,
-        format,
-        folder,
-        custom_name_prefix,
-        playlist_item_limit,
-        auto_start,
-        split_by_chapters,
-        chapter_template,
-        subtitle_format,
-        subtitle_language,
-        subtitle_mode,
+        o['url'],
+        o['download_type'],
+        o['codec'],
+        o['format'],
+        o['quality'],
+        o['folder'],
+        o['custom_name_prefix'],
+        o['playlist_item_limit'],
+        o['auto_start'],
+        o['split_by_chapters'],
+        o['chapter_template'],
+        o['subtitle_language'],
+        o['subtitle_mode'],
     )
     return web.Response(text=serializer.encode(status))
 
@@ -342,9 +508,85 @@ async def cancel_add(request):
     dqueue.cancel_add()
     return web.Response(text=serializer.encode({'status': 'ok'}), content_type='application/json')
 
+
+@routes.post(config.URL_PREFIX + 'subscribe')
+async def subscribe(request):
+    post = await _read_json_request(request)
+    try:
+        o = parse_download_options(post)
+    except web.HTTPBadRequest:
+        raise
+    cic = post.get('check_interval_minutes')
+    if cic is None:
+        cic = config.SUBSCRIPTION_DEFAULT_CHECK_INTERVAL
+    try:
+        cic = int(cic)
+    except (TypeError, ValueError) as exc:
+        raise web.HTTPBadRequest(reason='check_interval_minutes must be an integer') from exc
+    if cic < 1:
+        raise web.HTTPBadRequest(reason='check_interval_minutes must be at least 1')
+
+    result = await submgr.add_subscription(
+        o['url'],
+        check_interval_minutes=cic,
+        download_type=o['download_type'],
+        codec=o['codec'],
+        format=o['format'],
+        quality=o['quality'],
+        folder=o['folder'] or '',
+        custom_name_prefix=o['custom_name_prefix'],
+        auto_start=o['auto_start'],
+        playlist_item_limit=o['playlist_item_limit'],
+        split_by_chapters=o['split_by_chapters'],
+        chapter_template=o['chapter_template'],
+        subtitle_language=o['subtitle_language'],
+        subtitle_mode=o['subtitle_mode'],
+    )
+    return web.Response(text=serializer.encode(result))
+
+
+@routes.get(config.URL_PREFIX + 'subscriptions')
+async def subscriptions_list(request):
+    return web.Response(text=serializer.encode([s.to_public_dict() for s in submgr.list_all()]))
+
+
+@routes.post(config.URL_PREFIX + 'subscriptions/update')
+async def subscriptions_update(request):
+    post = await _read_json_request(request)
+    sub_id = post.get('id')
+    if not sub_id:
+        raise web.HTTPBadRequest(reason='missing subscription id')
+    changes = {k: v for k, v in post.items() if k != 'id' and k in ('enabled', 'check_interval_minutes', 'name')}
+    if not changes:
+        raise web.HTTPBadRequest(reason='no valid fields to update')
+    log.info("Subscription update requested for %s: %s", sub_id, sorted(changes.keys()))
+    result = await submgr.update_subscription(str(sub_id), changes)
+    return web.Response(text=serializer.encode(result))
+
+
+@routes.post(config.URL_PREFIX + 'subscriptions/delete')
+async def subscriptions_delete(request):
+    post = await _read_json_request(request)
+    ids = post.get('ids')
+    if not ids or not isinstance(ids, list):
+        raise web.HTTPBadRequest(reason='missing ids list')
+    result = await submgr.delete_subscriptions([str(i) for i in ids])
+    return web.Response(text=serializer.encode(result))
+
+
+@routes.post(config.URL_PREFIX + 'subscriptions/check')
+async def subscriptions_check(request):
+    post = await _read_json_request(request)
+    ids = post.get('ids')
+    if ids is not None and not isinstance(ids, list):
+        raise web.HTTPBadRequest(reason='ids must be a list')
+    log.info("Subscription check-now requested for ids=%s", ids if ids else "all-enabled")
+    result = await submgr.check_now([str(i) for i in ids] if ids else None)
+    return web.Response(text=serializer.encode(result))
+
 @routes.post(config.URL_PREFIX + 'delete')
 async def delete(request):
-    post = await request.json()
+    post = await _read_json_request(request)
     ids = post.get('ids')
     where = post.get('where')
     if not ids or where not in ['queue', 'done']:
@@ -356,7 +598,7 @@ async def delete(request):
 
 @routes.post(config.URL_PREFIX + 'start')
 async def start(request):
-    post = await request.json()
+    post = await _read_json_request(request)
     ids = post.get('ids')
     log.info(f"Received request to start pending downloads for ids: {ids}")
     status = await dqueue.start_pending(ids)
@@ -371,17 +613,23 @@ async def upload_cookies(request):
     field = await reader.next()
     if field is None or field.name != 'cookies':
         return web.Response(status=400, text=serializer.encode({'status': 'error', 'msg': 'No cookies file provided'}))
+
+    max_size = 1_000_000  # 1MB limit
     size = 0
-    with open(COOKIES_PATH, 'wb') as f:
-        while True:
-            chunk = await field.read_chunk()
-            if not chunk:
-                break
-            size += len(chunk)
-            if size > 1_000_000:  # 1MB limit
-                os.remove(COOKIES_PATH)
-                return web.Response(status=400, text=serializer.encode({'status': 'error', 'msg': 'Cookie file too large (max 1MB)'}))
-            f.write(chunk)
+    content = bytearray()
+    while True:
+        chunk = await field.read_chunk()
+        if not chunk:
+            break
+        size += len(chunk)
+        if size > max_size:
+            return web.Response(status=400, text=serializer.encode({'status': 'error', 'msg': 'Cookie file too large (max 1MB)'}))
+        content.extend(chunk)
+
+    tmp_cookie_path = f"{COOKIES_PATH}.tmp"
+    with open(tmp_cookie_path, 'wb') as f:
+        f.write(content)
+    os.replace(tmp_cookie_path, COOKIES_PATH)
     config.set_runtime_override('cookiefile', COOKIES_PATH)
     log.info(f'Cookies file uploaded ({size} bytes)')
     return web.Response(text=serializer.encode({'status': 'ok', 'msg': f'Cookies uploaded ({size} bytes)'}))
@@ -439,6 +687,7 @@ async def history(request):
 async def connect(sid, environ):
     log.info(f"Client connected: {sid}")
     await sio.emit('all', serializer.encode(dqueue.get()), to=sid)
+    await sio.emit('subscriptions_all', serializer.encode([s.to_public_dict() for s in submgr.list_all()]), to=sid)
     await sio.emit('configuration', serializer.encode(config.frontend_safe()), to=sid)
     if config.CUSTOM_DIRS:
         await sio.emit('custom_dirs', serializer.encode(get_custom_dirs()), to=sid)
@@ -446,6 +695,22 @@ async def connect(sid, environ):
         await sio.emit('ytdl_options_changed', serializer.encode(get_options_update_time()), to=sid)
 
 def get_custom_dirs():
+    cache_ttl_seconds = 5
+    now = asyncio.get_running_loop().time()
+    cache_key = (
+        config.DOWNLOAD_DIR,
+        config.AUDIO_DOWNLOAD_DIR,
+        config.CUSTOM_DIRS_EXCLUDE_REGEX,
+    )
+    if (
+        hasattr(get_custom_dirs, "_cache_key")
+        and hasattr(get_custom_dirs, "_cache_value")
+        and hasattr(get_custom_dirs, "_cache_time")
+        and get_custom_dirs._cache_key == cache_key
+        and (now - get_custom_dirs._cache_time) < cache_ttl_seconds
+    ):
+        return get_custom_dirs._cache_value
+
     def recursive_dirs(base):
         path = pathlib.Path(base)
 
@@ -482,20 +747,24 @@ def get_custom_dirs():
     if config.DOWNLOAD_DIR != config.AUDIO_DOWNLOAD_DIR:
         audio_download_dir = recursive_dirs(config.AUDIO_DOWNLOAD_DIR)
 
-    return {
+    result = {
         "download_dir": download_dir,
         "audio_download_dir": audio_download_dir
     }
+    get_custom_dirs._cache_key = cache_key
+    get_custom_dirs._cache_time = now
+    get_custom_dirs._cache_value = result
+    return result
 
 @routes.get(config.URL_PREFIX)
-def index(request):
+async def index(request):
     response = web.FileResponse(os.path.join(config.BASE_DIR, 'ui/dist/metube/browser/index.html'))
     if 'metube_theme' not in request.cookies:
         response.set_cookie('metube_theme', config.DEFAULT_THEME)
     return response
 
 @routes.get(config.URL_PREFIX + 'robots.txt')
-def robots(request):
+async def robots(request):
     if config.ROBOTS_TXT:
         response = web.FileResponse(os.path.join(config.BASE_DIR, config.ROBOTS_TXT))
     else:
@@ -505,7 +774,7 @@ def robots(request):
     return response
 
 @routes.get(config.URL_PREFIX + 'version')
-def version(request):
+async def version(request):
     return web.json_response({
         "yt-dlp": yt_dlp_version,
         "version": os.getenv("METUBE_VERSION", "dev")
@@ -513,11 +782,11 @@ def version(request):
 
 if config.URL_PREFIX != '/':
     @routes.get('/')
-    def index_redirect_root(request):
+    async def index_redirect_root(request):
         return web.HTTPFound(config.URL_PREFIX)
 
     @routes.get(config.URL_PREFIX[:-1])
-    def index_redirect_dir(request):
+    async def index_redirect_dir(request):
         return web.HTTPFound(config.URL_PREFIX)
 
 routes.static(config.URL_PREFIX + 'download/', config.DOWNLOAD_DIR, show_index=config.DOWNLOAD_DIRS_INDEXABLE)
@@ -537,6 +806,11 @@ async def add_cors(request):
 
 app.router.add_route('OPTIONS', config.URL_PREFIX + 'add', add_cors)
 app.router.add_route('OPTIONS', config.URL_PREFIX + 'cancel-add', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscribe', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscriptions', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscriptions/update', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscriptions/delete', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscriptions/check', add_cors)
 app.router.add_route('OPTIONS', config.URL_PREFIX + 'upload-cookies', add_cors)
 app.router.add_route('OPTIONS', config.URL_PREFIX + 'delete-cookies', add_cors)
 

app/state_store.py

@@ -0,0 +1,156 @@
+from __future__ import annotations
+
+import base64
+import collections.abc
+import json
+import logging
+import os
+import shelve
+import tempfile
+import time
+from datetime import datetime
+from typing import Any, Optional
+
+log = logging.getLogger("state_store")
+
+STATE_SCHEMA_VERSION = 2
+_BYTES_MARKER = "__metube_bytes__"
+_DATETIME_MARKER = "__metube_datetime__"
+
+
+def to_json_compatible(value: Any) -> Any:
+    if value is None or isinstance(value, (bool, int, float, str)):
+        return value
+    if isinstance(value, bytes):
+        return {_BYTES_MARKER: base64.b64encode(value).decode("ascii")}
+    if isinstance(value, datetime):
+        return {_DATETIME_MARKER: value.isoformat()}
+    if isinstance(value, collections.abc.Mapping):
+        return {str(k): to_json_compatible(v) for k, v in value.items()}
+    if isinstance(value, (list, tuple, set, frozenset)):
+        return [to_json_compatible(v) for v in value]
+    if isinstance(value, collections.abc.Iterable):
+        return [to_json_compatible(v) for v in value]
+    raise TypeError(f"Value of type {type(value).__name__} is not JSON serializable")
+
+
+def from_json_compatible(value: Any) -> Any:
+    if isinstance(value, list):
+        return [from_json_compatible(v) for v in value]
+    if isinstance(value, dict):
+        if set(value.keys()) == {_BYTES_MARKER}:
+            return base64.b64decode(value[_BYTES_MARKER].encode("ascii"))
+        if set(value.keys()) == {_DATETIME_MARKER}:
+            return datetime.fromisoformat(value[_DATETIME_MARKER])
+        return {k: from_json_compatible(v) for k, v in value.items()}
+    return value
+
+
+def read_legacy_shelf(path: str) -> Optional[list[tuple[Any, Any]]]:
+    if not os.path.exists(path):
+        return None
+    try:
+        with shelve.open(path, "r") as shelf:
+            return list(shelf.items())
+    except Exception as exc:
+        log.warning("Could not read legacy shelf at %s: %s", path, exc)
+        return None
+
+
+class AtomicJsonStore:
+    def __init__(self, path: str, *, kind: str, schema_version: int = STATE_SCHEMA_VERSION):
+        self.path = path
+        self.kind = kind
+        self.schema_version = schema_version
+
+    def _ensure_parent(self) -> None:
+        parent = os.path.dirname(self.path)
+        if parent and not os.path.isdir(parent):
+            os.makedirs(parent, exist_ok=True)
+
+    def _build_payload(self, data: dict[str, Any]) -> dict[str, Any]:
+        payload = {
+            "schema_version": self.schema_version,
+            "kind": self.kind,
+        }
+        payload.update(data)
+        return payload
+
+    def load(self) -> Optional[dict[str, Any]]:
+        if not os.path.exists(self.path):
+            return None
+        try:
+            with open(self.path, encoding="utf-8") as f:
+                payload = json.load(f)
+            if not isinstance(payload, dict):
+                raise ValueError("State file must contain a JSON object")
+            if payload.get("kind") != self.kind:
+                raise ValueError(
+                    f"State file kind mismatch: expected {self.kind}, got {payload.get('kind')}"
+                )
+            return payload
+        except Exception as exc:
+            self.quarantine_invalid_file(exc)
+            return None
+
+    def save(self, data: dict[str, Any]) -> None:
+        self._ensure_parent()
+        payload = self._build_payload(data)
+        parent = os.path.dirname(self.path) or "."
+        fd, tmp_path = tempfile.mkstemp(
+            prefix=f".{os.path.basename(self.path)}.",
+            suffix=".tmp",
+            dir=parent,
+            text=True,
+        )
+        try:
+            with os.fdopen(fd, "w", encoding="utf-8") as f:
+                json.dump(payload, f, ensure_ascii=False, separators=(",", ":"))
+                f.write("\n")
+                f.flush()
+                os.fsync(f.fileno())
+            os.replace(tmp_path, self.path)
+            self._fsync_directory(parent)
+        except Exception:
+            try:
+                os.remove(tmp_path)
+            except OSError:
+                pass
+            raise
+
+    def quarantine_invalid_file(self, exc: Exception) -> None:
+        if not os.path.exists(self.path):
+            return
+        ts = time.strftime("%Y%m%d%H%M%S")
+        backup_path = f"{self.path}.invalid.{ts}"
+        try:
+            os.replace(self.path, backup_path)
+            log.warning(
+                "State file at %s was invalid (%s); moved it to %s",
+                self.path,
+                exc,
+                backup_path,
+            )
+        except OSError as move_exc:
+            log.warning(
+                "State file at %s was invalid (%s) and could not be moved aside: %s",
+                self.path,
+                exc,
+                move_exc,
+            )
+
+    @staticmethod
+    def _fsync_directory(path: str) -> None:
+        try:
+            flags = os.O_RDONLY
+            if hasattr(os, "O_DIRECTORY"):
+                flags |= os.O_DIRECTORY
+            fd = os.open(path, flags)
+        except OSError:
+            return
+        try:
+            os.fsync(fd)
+        except OSError:
+            pass
+        finally:
+            os.close(fd)

app/subscriptions.py

@@ -0,0 +1,666 @@
+"""Channel/playlist subscriptions: periodic yt-dlp flat extract + queue new videos."""
+
+from __future__ import annotations
+
+import asyncio
+import copy
+import logging
+import os
+import time
+import types
+import uuid
+from dataclasses import dataclass, field, fields
+from typing import Any, Optional
+
+import yt_dlp
+import yt_dlp.networking.impersonate
+from state_store import AtomicJsonStore, read_legacy_shelf
+
+log = logging.getLogger("subscriptions")
+
+VIDEO_ONLY_MSG = (
+    "This URL points to a single video, not a channel or playlist. Use Download instead."
+)
+_MEDIA_HINT_FIELDS = (
+    "duration",
+    "timestamp",
+    "release_timestamp",
+    "upload_date",
+    "view_count",
+    "live_status",
+    "availability",
+)
+
+
+def _impersonate_opt(ytdl_options: dict) -> dict:
+    opts = dict(ytdl_options)
+    if "impersonate" in opts:
+        opts["impersonate"] = yt_dlp.networking.impersonate.ImpersonateTarget.from_str(
+            opts["impersonate"]
+        )
+    return opts
+
+
+def _build_ydl_params(config, *, playlistend: Optional[int] = None) -> dict:
+    params: dict[str, Any] = {
+        "quiet": not logging.getLogger().isEnabledFor(logging.DEBUG),
+        "verbose": logging.getLogger().isEnabledFor(logging.DEBUG),
+        "no_color": True,
+        "extract_flat": True,
+        "ignore_no_formats_error": True,
+        "lazy_playlist": True,
+        "paths": {"home": config.DOWNLOAD_DIR, "temp": config.TEMP_DIR},
+        **config.YTDL_OPTIONS,
+    }
+    params = _impersonate_opt(params)
+    if playlistend is not None and playlistend > 0:
+        params["playlistend"] = playlistend
+    return params
+
+
+def _is_media_entry(entry: Any) -> bool:
+    if not isinstance(entry, dict):
+        return False
+    etype = str(entry.get("_type") or "")
+    if etype in ("playlist", "multi_video", "channel"):
+        return False
+    if entry.get("entries"):
+        return False
+    url = _entry_video_url(entry)
+    if not url:
+        return False
+    ie_key = str(entry.get("ie_key") or entry.get("extractor_key") or "").lower()
+    if any(token in ie_key for token in ("playlist", "channel", "tab")):
+        return any(entry.get(field) is not None for field in _MEDIA_HINT_FIELDS)
+    return True
+
+
+def extract_flat_playlist(config, url: str, playlistend: int, *, _depth: int = 0):
+    """Return (info_dict, entries_list) for playlist/channel URLs."""
+    params = _build_ydl_params(config, playlistend=playlistend)
+    with yt_dlp.YoutubeDL(params=params) as ydl:
+        info = ydl.extract_info(url, download=False)
+    if not info:
+        return None, []
+    etype = info.get("_type") or "video"
+    if etype == "video":
+        return info, []
+    if etype in ("playlist", "channel"):
+        entries = info.get("entries") or []
+        if isinstance(entries, types.GeneratorType):
+            entries = list(entries)
+        # Drop None placeholders from incomplete flat playlists
+        entries = [e for e in entries if e]
+        media_entries = [e for e in entries if _is_media_entry(e)]
+        if media_entries:
+            return info, media_entries
+        if _depth < 1:
+            for ent in entries[:5]:
+                nested_url = _entry_video_url(ent)
+                if not nested_url:
+                    continue
+                nested_info, nested_entries = extract_flat_playlist(
+                    config,
+                    nested_url,
+                    playlistend,
+                    _depth=_depth + 1,
+                )
+                if nested_entries:
+                    return nested_info, nested_entries
+        return info, entries
+    if etype.startswith("url") and info.get("url"):
+        # Single nested URL without playlist wrapper — treat as non-subscribable
+        return info, []
+    return info, []
+
+
+def _entry_video_url(entry: dict) -> Optional[str]:
+    return entry.get("webpage_url") or entry.get("url")
+
+
+def _entry_id(entry: dict) -> Optional[str]:
+    eid = entry.get("id")
+    if eid is not None:
+        return str(eid)
+    url = _entry_video_url(entry)
+    return url
+
+
+@dataclass
+class SubscriptionInfo:
+    id: str
+    name: str
+    url: str
+    enabled: bool = True
+    check_interval_minutes: int = 60
+    download_type: str = "video"
+    codec: str = "auto"
+    format: str = "any"
+    quality: str = "best"
+    folder: str = ""
+    custom_name_prefix: str = ""
+    auto_start: bool = True
+    playlist_item_limit: int = 0
+    split_by_chapters: bool = False
+    chapter_template: str = ""
+    subtitle_language: str = "en"
+    subtitle_mode: str = "prefer_manual"
+    last_checked: Optional[float] = None
+    seen_ids: list[str] = field(default_factory=list)
+    error: Optional[str] = None
+    timestamp: float = field(default_factory=time.time)
+
+    def seen_set(self) -> set[str]:
+        return set(self.seen_ids)
+
+    def to_public_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "name": self.name,
+            "url": self.url,
+            "enabled": self.enabled,
+            "check_interval_minutes": self.check_interval_minutes,
+            "download_type": self.download_type,
+            "codec": self.codec,
+            "format": self.format,
+            "quality": self.quality,
+            "folder": self.folder,
+            "last_checked": self.last_checked,
+            "seen_count": len(self.seen_ids),
+            "error": self.error,
+        }
+
+
+def _subscription_to_record(sub: SubscriptionInfo) -> dict[str, Any]:
+    return {
+        "id": sub.id,
+        "name": sub.name,
+        "url": sub.url,
+        "enabled": sub.enabled,
+        "check_interval_minutes": sub.check_interval_minutes,
+        "download_type": sub.download_type,
+        "codec": sub.codec,
+        "format": sub.format,
+        "quality": sub.quality,
+        "folder": sub.folder,
+        "custom_name_prefix": sub.custom_name_prefix,
+        "auto_start": sub.auto_start,
+        "playlist_item_limit": sub.playlist_item_limit,
+        "split_by_chapters": sub.split_by_chapters,
+        "chapter_template": sub.chapter_template,
+        "subtitle_language": sub.subtitle_language,
+        "subtitle_mode": sub.subtitle_mode,
+        "last_checked": sub.last_checked,
+        "seen_ids": list(sub.seen_ids),
+        "error": sub.error,
+    }
+
+
+def _subscription_from_record(record: Any) -> Optional[SubscriptionInfo]:
+    field_names = {f.name for f in fields(SubscriptionInfo)}
+    if isinstance(record, SubscriptionInfo):
+        return record
+    if isinstance(record, dict):
+        try:
+            return SubscriptionInfo(**{k: v for k, v in record.items() if k in field_names})
+        except TypeError:
+            return None
+    return None
+
+
+class SubscriptionNotifier:
+    """Hook for Socket.IO / UI updates."""
+
+    async def subscription_added(self, sub: SubscriptionInfo) -> None:
+        raise NotImplementedError
+
+    async def subscription_updated(self, sub: SubscriptionInfo) -> None:
+        raise NotImplementedError
+
+    async def subscription_removed(self, sub_id: str) -> None:
+        raise NotImplementedError
+
+    async def subscriptions_all(self, subs: list[SubscriptionInfo]) -> None:
+        raise NotImplementedError
+
+
+class SubscriptionManager:
+    def __init__(self, config, download_queue, notifier: SubscriptionNotifier):
+        self.config = config
+        self.dqueue = download_queue
+        self.notifier = notifier
+        pdir = config.STATE_DIR
+        if not os.path.isdir(pdir):
+            os.makedirs(pdir, exist_ok=True)
+        self._legacy_path = os.path.join(pdir, "subscriptions")
+        self._path = os.path.join(pdir, "subscriptions.json")
+        self._store = AtomicJsonStore(self._path, kind="subscriptions")
+        self._subs: dict[str, SubscriptionInfo] = {}
+        self._url_index: dict[str, str] = {}  # normalized url -> id
+        self._pending_urls: set[str] = set()
+        self._lock = asyncio.Lock()
+        self._loop_task: Optional[asyncio.Task] = None
+        self._load_all()
+
+    def close(self) -> None:
+        # No persistent shelf handle to close.
+        return
+
+    def _normalize_url(self, url: str) -> str:
+        return (url or "").strip()
+
+    def _normalize_seen_ids(self, seen_ids: list[str]) -> list[str]:
+        max_seen = int(getattr(self.config, "SUBSCRIPTION_MAX_SEEN_IDS", 50000))
+        normalized = [str(sid) for sid in dict.fromkeys(seen_ids)]
+        if len(normalized) > max_seen:
+            normalized = normalized[:max_seen]
+        return normalized
+
+    def _load_all(self) -> None:
+        payload = self._store.load()
+        loaded_from_legacy = False
+        if payload is not None:
+            records = payload.get("items") or []
+        else:
+            legacy_items = read_legacy_shelf(self._legacy_path)
+            records = [raw for _key, raw in legacy_items] if legacy_items else []
+            if records:
+                loaded_from_legacy = True
+
+        loaded_subs = self._iter_valid_subs(records)
+        compact_records = []
+        for sub in loaded_subs:
+            sub.seen_ids = self._normalize_seen_ids(sub.seen_ids)
+            self._subs[sub.id] = sub
+            self._url_index[self._normalize_url(sub.url)] = sub.id
+            compact_records.append(_subscription_to_record(sub))
+
+        if loaded_from_legacy or (
+            payload is not None
+            and (
+                payload.get("schema_version") != self._store.schema_version
+                or compact_records != records
+            )
+        ):
+            self._store.save({"items": compact_records})
+
+    def _iter_valid_subs(self, records: list[Any]) -> list[SubscriptionInfo]:
+        subs: list[SubscriptionInfo] = []
+        for record in records:
+            sub = _subscription_from_record(record)
+            if sub is not None:
+                subs.append(sub)
+        return subs
+
+    def _save_locked(self) -> None:
+        self._store.save({"items": [_subscription_to_record(sub) for sub in self._subs.values()]})
+
+    async def _queue_subscription_entries(
+        self,
+        entries: list[dict],
+        *,
+        download_type: str,
+        codec: str,
+        format: str,
+        quality: str,
+        folder: str,
+        custom_name_prefix: str,
+        playlist_item_limit: int,
+        auto_start: bool,
+        split_by_chapters: bool,
+        chapter_template: str,
+        subtitle_language: str,
+        subtitle_mode: str,
+    ) -> tuple[list[str], list[str]]:
+        queued_ids: list[str] = []
+        queue_errors: list[str] = []
+        for ent in entries:
+            eid = _entry_id(ent)
+            vurl = _entry_video_url(ent)
+            if not eid or not vurl:
+                continue
+            queue_entry = dict(ent)
+            queue_entry["_type"] = "video"
+            queue_entry["webpage_url"] = vurl
+            result = await self.dqueue.add_entry(
+                queue_entry,
+                download_type,
+                codec,
+                format,
+                quality,
+                folder or None,
+                custom_name_prefix,
+                playlist_item_limit,
+                auto_start,
+                split_by_chapters,
+                chapter_template or None,
+                subtitle_language,
+                subtitle_mode,
+            )
+            if isinstance(result, dict) and result.get("status") == "error":
+                msg = str(result.get("msg") or f"Queueing failed for {vurl}")
+                queue_errors.append(msg)
+                log.warning("Subscription queueing failed for %s: %s", vurl, msg)
+                continue
+            queued_ids.append(eid)
+        return queued_ids, queue_errors
+
+    def list_all(self) -> list[SubscriptionInfo]:
+        return list(self._subs.values())
+
+    def get(self, sub_id: str) -> Optional[SubscriptionInfo]:
+        return self._subs.get(sub_id)
+
+    def start_background_loop(self) -> None:
+        if self._loop_task is not None and not self._loop_task.done():
+            return
+        self._loop_task = asyncio.create_task(self._periodic_loop())
+        self._loop_task.add_done_callback(
+            lambda t: log.error("Subscription loop failed: %s", t.exception())
+            if not t.cancelled() and t.exception()
+            else None
+        )
+
+    async def _periodic_loop(self) -> None:
+        while True:
+            await asyncio.sleep(60)
+            try:
+                await self.run_due_checks()
+            except Exception as e:
+                log.exception("Subscription periodic check error: %s", e)
+
+    async def run_due_checks(self) -> None:
+        now = time.time()
+        due: list[SubscriptionInfo] = []
+        async with self._lock:
+            for sub in list(self._subs.values()):
+                if not sub.enabled:
+                    continue
+                interval_sec = max(60, int(sub.check_interval_minutes) * 60)
+                if sub.last_checked is None:
+                    due.append(sub)
+                    continue
+                if now - sub.last_checked < interval_sec:
+                    continue
+                due.append(sub)
+        for sub in due:
+            await self._check_one_unlocked(sub)
+
+    async def add_subscription(
+        self,
+        url: str,
+        *,
+        check_interval_minutes: int,
+        download_type: str,
+        codec: str,
+        format: str,
+        quality: str,
+        folder: str,
+        custom_name_prefix: str,
+        auto_start: bool,
+        playlist_item_limit: int,
+        split_by_chapters: bool,
+        chapter_template: str,
+        subtitle_language: str,
+        subtitle_mode: str,
+    ) -> dict:
+        url = self._normalize_url(url)
+        if not url:
+            return {"status": "error", "msg": "Missing URL"}
+
+        async with self._lock:
+            if url in self._url_index or url in self._pending_urls:
+                return {"status": "error", "msg": "This URL is already subscribed"}
+            self._pending_urls.add(url)
+
+        try:
+            scan_first = max(int(getattr(self.config, "SUBSCRIPTION_SCAN_PLAYLIST_END", 50)), 1)
+            try:
+                info, entries = extract_flat_playlist(self.config, url, scan_first)
+            except yt_dlp.utils.YoutubeDLError as exc:
+                return {"status": "error", "msg": str(exc)}
+
+            if not info:
+                return {"status": "error", "msg": "Could not resolve URL"}
+
+            etype = info.get("_type") or "video"
+            if etype not in ("playlist", "channel"):
+                return {"status": "error", "msg": VIDEO_ONLY_MSG}
+
+            name = (
+                info.get("title")
+                or info.get("channel")
+                or info.get("playlist_title")
+                or info.get("uploader")
+                or url
+            )
+
+            seen_entries = [ent for ent in entries if _is_media_entry(ent)]
+            all_ids: list[str] = []
+            for ent in seen_entries:
+                eid = _entry_id(ent)
+                if eid:
+                    all_ids.append(eid)
+
+            sub = SubscriptionInfo(
+                id=str(uuid.uuid4()),
+                name=str(name),
+                url=url,
+                enabled=True,
+                check_interval_minutes=max(1, int(check_interval_minutes)),
+                download_type=download_type,
+                codec=codec,
+                format=format,
+                quality=quality,
+                folder=folder or "",
+                custom_name_prefix=custom_name_prefix or "",
+                auto_start=bool(auto_start),
+                playlist_item_limit=int(playlist_item_limit),
+                split_by_chapters=bool(split_by_chapters),
+                chapter_template=chapter_template or "",
+                subtitle_language=subtitle_language,
+                subtitle_mode=subtitle_mode,
+                last_checked=time.time(),
+                seen_ids=list(dict.fromkeys(all_ids)),
+                error=None,
+            )
+
+            async with self._lock:
+                if url in self._url_index:
+                    return {"status": "error", "msg": "This URL is already subscribed"}
+                self._subs[sub.id] = sub
+                self._url_index[url] = sub.id
+                try:
+                    self._save_locked()
+                except Exception:
+                    self._subs.pop(sub.id, None)
+                    self._url_index.pop(url, None)
+                    raise
+
+            await self.notifier.subscription_added(sub)
+            return {"status": "ok", "subscription": sub.to_public_dict()}
+        finally:
+            async with self._lock:
+                self._pending_urls.discard(url)
+
+    async def delete_subscriptions(self, ids: list[str]) -> dict:
+        removed: list[str] = []
+        async with self._lock:
+            previous_subs = self._subs.copy()
+            previous_index = self._url_index.copy()
+            for sid in ids:
+                sub = self._subs.pop(sid, None)
+                if sub:
+                    normalized_url = self._normalize_url(sub.url)
+                    self._url_index.pop(normalized_url, None)
+                    removed.append(sid)
+            if removed:
+                try:
+                    self._save_locked()
+                except Exception:
+                    self._subs = previous_subs
+                    self._url_index = previous_index
+                    raise
+        for sid in removed:
+            await self.notifier.subscription_removed(sid)
+        return {"status": "ok"}
+
+    async def update_subscription(self, sub_id: str, changes: dict) -> dict:
+        async with self._lock:
+            sub = self._subs.get(sub_id)
+            if not sub:
+                return {"status": "error", "msg": "Subscription not found"}
+            previous = copy.deepcopy(sub)
+            old_enabled = sub.enabled
+
+            if "enabled" in changes:
+                sub.enabled = bool(changes["enabled"])
+            if "check_interval_minutes" in changes:
+                sub.check_interval_minutes = max(1, int(changes["check_interval_minutes"]))
+            if "name" in changes and changes["name"]:
+                sub.name = str(changes["name"])
+
+            try:
+                self._save_locked()
+            except Exception:
+                self._subs[sub_id] = previous
+                raise
+            updated = sub
+        if "enabled" in changes and updated.enabled != old_enabled:
+            log.info(
+                "Subscription %s %s",
+                updated.name,
+                "resumed" if updated.enabled else "paused",
+            )
+        await self.notifier.subscription_updated(updated)
+        return {"status": "ok", "subscription": updated.to_public_dict()}
+
+    async def check_now(self, ids: Optional[list[str]] = None) -> dict:
+        async with self._lock:
+            targets = (
+                [self._subs[i] for i in ids if i in self._subs]
+                if ids
+                else [s for s in self._subs.values() if s.enabled]
+            )
+        log.info(
+            "Manual subscription check requested for %d subscription(s)",
+            len(targets),
+        )
+        for sub in targets:
+            await self._check_one_unlocked(sub)
+        return {"status": "ok"}
+
+    async def _check_one_unlocked(self, sub: SubscriptionInfo) -> None:
+        sid = sub.id
+        scan = int(getattr(self.config, "SUBSCRIPTION_SCAN_PLAYLIST_END", 50))
+        log.info("Checking subscription: %s", sub.name)
+        try:
+            info, entries = extract_flat_playlist(self.config, sub.url, scan)
+        except yt_dlp.utils.YoutubeDLError as exc:
+            async with self._lock:
+                cur = self._subs.get(sid)
+                if cur:
+                    previous = copy.deepcopy(cur)
+                    cur.error = str(exc)
+                    try:
+                        self._save_locked()
+                    except Exception:
+                        self._subs[sid] = previous
+                        raise
+                    sub = cur
+            log.warning("Subscription check failed for %s: %s", sub.name, exc)
+            await self.notifier.subscription_updated(sub)
+            return
+        entries = [ent for ent in entries if _is_media_entry(ent)]
+
+        etype = (info or {}).get("_type") or "video"
+        if etype == "video" or not entries:
+            async with self._lock:
+                cur = self._subs.get(sid)
+                if cur:
+                    previous = copy.deepcopy(cur)
+                    cur.error = VIDEO_ONLY_MSG
+                    try:
+                        self._save_locked()
+                    except Exception:
+                        self._subs[sid] = previous
+                        raise
+                    sub = cur
+            log.warning("Subscription %s no longer resolves to a subscribable feed", sub.name)
+            await self.notifier.subscription_updated(sub)
+            return
+
+        async with self._lock:
+            cur = self._subs.get(sid)
+            if not cur:
+                return
+            seen = cur.seen_set()
+            seen_ids_snapshot = list(cur.seen_ids)
+            dl_type = cur.download_type
+            dl_codec = cur.codec
+            dl_format = cur.format
+            dl_quality = cur.quality
+            dl_folder = cur.folder
+            dl_prefix = cur.custom_name_prefix
+            dl_plimit = cur.playlist_item_limit
+            dl_autostart = cur.auto_start
+            dl_split = cur.split_by_chapters
+            dl_chapter = cur.chapter_template
+            dl_sublang = cur.subtitle_language
+            dl_submode = cur.subtitle_mode
+
+        new_entries: list[dict] = []
+        new_ids: list[str] = []
+        for ent in entries:
+            eid = _entry_id(ent)
+            if not eid or eid in seen:
+                continue
+            new_entries.append(ent)
+            new_ids.append(eid)
+
+        queued_ids, queue_errors = await self._queue_subscription_entries(
+            new_entries,
+            download_type=dl_type,
+            codec=dl_codec,
+            format=dl_format,
+            quality=dl_quality,
+            folder=dl_folder,
+            custom_name_prefix=dl_prefix,
+            playlist_item_limit=dl_plimit,
+            auto_start=dl_autostart,
+            split_by_chapters=dl_split,
+            chapter_template=dl_chapter or "",
+            subtitle_language=dl_sublang,
+            subtitle_mode=dl_submode,
+        )
+        log.info(
+            "Subscription check finished for %s: %d new, %d queued, %d failed",
+            sub.name,
+            len(new_entries),
+            len(queued_ids),
+            len(queue_errors),
+        )
+
+        merged = list(dict.fromkeys(queued_ids + seen_ids_snapshot))
+        max_seen = int(getattr(self.config, "SUBSCRIPTION_MAX_SEEN_IDS", 50000))
+        if len(merged) > max_seen:
+            merged = merged[:max_seen]
+
+        async with self._lock:
+            cur = self._subs.get(sid)
+            if not cur:
+                return
+            previous = copy.deepcopy(cur)
+            cur.seen_ids = merged
+            cur.last_checked = time.time()
+            cur.error = "; ".join(queue_errors[:3]) if queue_errors else None
+            try:
+                self._save_locked()
+            except Exception:
+                self._subs[sid] = previous
+                raise
+            sub = cur
+        await self.notifier.subscription_updated(sub)
+
+    async def emit_all(self) -> None:
+        await self.notifier.subscriptions_all(self.list_all())

app/tests/conftest.py

@@ -0,0 +1,32 @@
+"""Pytest configuration: set env and filesystem layout before importing ``main``."""
+
+from __future__ import annotations
+
+import os
+import tempfile
+from pathlib import Path
+
+
+def _ensure_test_env() -> None:
+    if os.environ.get("METUBE_TEST_ENV_READY"):
+        return
+    tmp = tempfile.mkdtemp(prefix="metube-pytest-")
+    base = Path(tmp)
+    browser = base / "ui" / "dist" / "metube" / "browser"
+    browser.mkdir(parents=True)
+    (browser / "index.html").write_text("<html><body></body></html>", encoding="utf-8")
+    dl = base / "downloads"
+    st = base / "state"
+    dl.mkdir(parents=True)
+    st.mkdir(parents=True)
+    os.environ["DOWNLOAD_DIR"] = str(dl)
+    os.environ["STATE_DIR"] = str(st)
+    os.environ["TEMP_DIR"] = str(dl)
+    os.environ["YTDL_OPTIONS"] = "{}"
+    os.environ["YTDL_OPTIONS_FILE"] = ""
+    os.environ["BASE_DIR"] = str(base)
+    os.environ["LOGLEVEL"] = "INFO"
+    os.environ["METUBE_TEST_ENV_READY"] = "1"
+
+
+_ensure_test_env()

app/tests/test_api.py

@@ -0,0 +1,207 @@
+"""HTTP handler tests for ``main`` using mocked ``web.Request`` (no TestServer)."""
+
+from __future__ import annotations
+
+import json
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+from aiohttp import web
+
+import main
+
+
+@pytest.fixture
+def mock_dqueue(monkeypatch):
+    d = MagicMock()
+    d.initialize = AsyncMock(return_value=None)
+    d.add = AsyncMock(return_value={"status": "ok"})
+    d.cancel = AsyncMock(return_value={"status": "ok"})
+    d.start_pending = AsyncMock(return_value={"status": "ok"})
+    d.cancel_add = MagicMock()
+    d.queue = MagicMock()
+    d.done = MagicMock()
+    d.pending = MagicMock()
+    d.queue.saved_items = MagicMock(return_value=[])
+    d.done.saved_items = MagicMock(return_value=[])
+    d.pending.saved_items = MagicMock(return_value=[])
+    d.get = MagicMock(return_value=([], []))
+    monkeypatch.setattr(main, "dqueue", d)
+    return d
+
+
+def _valid_video_add_body(**kwargs):
+    base = {
+        "url": "https://example.com/watch?v=1",
+        "download_type": "video",
+        "codec": "auto",
+        "format": "any",
+        "quality": "best",
+    }
+    base.update(kwargs)
+    return base
+
+
+def _json_request(body: dict | None):
+    req = MagicMock(spec=web.Request)
+    req.json = AsyncMock(return_value=body)
+    return req
+
+
+@pytest.mark.asyncio
+async def test_add_ok(mock_dqueue):
+    req = _json_request(_valid_video_add_body())
+    resp = await main.add(req)
+    assert resp.status == 200
+    text = resp.text
+    data = json.loads(text)
+    assert data["status"] == "ok"
+    mock_dqueue.add.assert_awaited_once()
+
+
+@pytest.mark.asyncio
+async def test_add_missing_url_returns_400(mock_dqueue):
+    req = _json_request({"download_type": "video", "quality": "best", "format": "any"})
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+    mock_dqueue.add.assert_not_called()
+
+
+@pytest.mark.asyncio
+async def test_add_invalid_download_type(mock_dqueue):
+    req = _json_request(_valid_video_add_body(download_type="invalid"))
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
+@pytest.mark.asyncio
+async def test_add_invalid_video_quality(mock_dqueue):
+    req = _json_request(_valid_video_add_body(quality="9999"))
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
+@pytest.mark.asyncio
+async def test_add_invalid_subtitle_language(mock_dqueue):
+    req = _json_request(
+        {
+            "url": "https://example.com/v",
+            "download_type": "captions",
+            "codec": "auto",
+            "format": "srt",
+            "quality": "best",
+            "subtitle_language": "bad language!",
+        }
+    )
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
+@pytest.mark.asyncio
+async def test_add_custom_name_prefix_path_traversal(mock_dqueue):
+    req = _json_request(_valid_video_add_body(custom_name_prefix="../evil"))
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
+@pytest.mark.asyncio
+async def test_add_chapter_template_path_traversal(mock_dqueue):
+    req = _json_request(
+        _valid_video_add_body(
+            split_by_chapters=True,
+            chapter_template="/etc/passwd%(title)s",
+        )
+    )
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
+@pytest.mark.asyncio
+async def test_add_invalid_json_body(mock_dqueue):
+    req = MagicMock(spec=web.Request)
+    req.json = AsyncMock(side_effect=json.JSONDecodeError("msg", "", 0))
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
+@pytest.mark.asyncio
+async def test_delete_missing_ids(mock_dqueue):
+    req = _json_request({"where": "queue"})
+    with pytest.raises(web.HTTPBadRequest):
+        await main.delete(req)
+
+
+@pytest.mark.asyncio
+async def test_delete_queue_calls_cancel(mock_dqueue):
+    req = _json_request({"where": "queue", "ids": ["http://x"]})
+    resp = await main.delete(req)
+    assert resp.status == 200
+    mock_dqueue.cancel.assert_awaited_once_with(["http://x"])
+
+
+@pytest.mark.asyncio
+async def test_start_pending(mock_dqueue):
+    req = _json_request({"ids": ["a"]})
+    resp = await main.start(req)
+    assert resp.status == 200
+    mock_dqueue.start_pending.assert_awaited_once_with(["a"])
+
+
+@pytest.mark.asyncio
+async def test_history_shape(mock_dqueue):
+    mock_dqueue.queue.saved_items.return_value = []
+    mock_dqueue.done.saved_items.return_value = []
+    mock_dqueue.pending.saved_items.return_value = []
+    req = MagicMock(spec=web.Request)
+    resp = await main.history(req)
+    assert resp.status == 200
+    data = json.loads(resp.text)
+    assert set(data.keys()) == {"done", "queue", "pending"}
+
+
+@pytest.mark.asyncio
+async def test_version_json(mock_dqueue):
+    req = MagicMock(spec=web.Request)
+    resp = await main.version(req)
+    assert resp.status == 200
+    body = json.loads(resp.text)
+    assert "yt-dlp" in body and "version" in body
+
+
+@pytest.mark.asyncio
+async def test_cookie_status(mock_dqueue):
+    req = MagicMock(spec=web.Request)
+    resp = await main.cookie_status(req)
+    assert resp.status == 200
+    data = json.loads(resp.text)
+    assert data.get("status") == "ok"
+    assert "has_cookies" in data
+
+
+@pytest.mark.asyncio
+async def test_options_add_cors(mock_dqueue):
+    req = MagicMock(spec=web.Request)
+    resp = await main.add_cors(req)
+    assert resp.status == 200
+
+
+@pytest.mark.asyncio
+async def test_upload_cookies_missing_field(mock_dqueue):
+    req = MagicMock(spec=web.Request)
+    reader = MagicMock()
+    field = MagicMock()
+    field.name = "wrongname"
+    reader.next = AsyncMock(side_effect=[field, None])
+    req.multipart = AsyncMock(return_value=reader)
+    resp = await main.upload_cookies(req)
+    assert resp.status == 400
+
+
+@pytest.mark.asyncio
+async def test_add_legacy_format_migrated(mock_dqueue):
+    req = _json_request({"url": "https://example.com/v", "format": "m4a", "quality": "best"})
+    resp = await main.add(req)
+    assert resp.status == 200
+    call = mock_dqueue.add.await_args
+    assert call is not None
+    assert call.args[1] == "audio"

app/tests/test_config.py

@@ -0,0 +1,78 @@
+"""Tests for ``Config`` (env parsing, yt-dlp options, frontend_safe)."""
+
+from __future__ import annotations
+
+import json
+import os
+import tempfile
+import unittest
+from unittest.mock import patch
+
+from main import Config
+
+
+def _base_env(**overrides: str) -> dict[str, str]:
+    env = {k: str(v) for k, v in Config._DEFAULTS.items()}
+    env.update(overrides)
+    return env
+
+
+class ConfigTests(unittest.TestCase):
+    def test_url_prefix_gets_trailing_slash(self):
+        with patch.dict(os.environ, _base_env(URL_PREFIX="foo"), clear=False):
+            c = Config()
+        self.assertEqual(c.URL_PREFIX, "foo/")
+
+    def test_ytdl_options_json_loaded(self):
+        opts = {"quiet": True, "no_warnings": True}
+        with patch.dict(
+            os.environ,
+            _base_env(YTDL_OPTIONS=json.dumps(opts)),
+            clear=False,
+        ):
+            c = Config()
+        self.assertEqual(c.YTDL_OPTIONS["quiet"], True)
+
+    def test_invalid_ytdl_options_exits(self):
+        with patch.dict(os.environ, _base_env(YTDL_OPTIONS="not-json"), clear=False):
+            with self.assertRaises(SystemExit):
+                Config()
+
+    def test_invalid_boolean_env_exits(self):
+        with patch.dict(os.environ, _base_env(CUSTOM_DIRS="maybe"), clear=False):
+            with self.assertRaises(SystemExit):
+                Config()
+
+    def test_frontend_safe_excludes_secrets(self):
+        with patch.dict(os.environ, _base_env(), clear=False):
+            c = Config()
+        safe = c.frontend_safe()
+        self.assertNotIn("YTDL_OPTIONS", safe)
+        self.assertNotIn("HOST", safe)
+
+    def test_runtime_override_roundtrip(self):
+        with patch.dict(os.environ, _base_env(), clear=False):
+            c = Config()
+            c.set_runtime_override("cookiefile", "/tmp/c.txt")
+            self.assertEqual(c.YTDL_OPTIONS.get("cookiefile"), "/tmp/c.txt")
+            c.remove_runtime_override("cookiefile")
+            self.assertIsNone(c.YTDL_OPTIONS.get("cookiefile"))
+
+    def test_ytdl_options_file_merges(self):
+        with tempfile.NamedTemporaryFile("w", suffix=".json", delete=False) as f:
+            json.dump({"extractor_args": {"youtube": {"player_client": ["web"]}}}, f)
+            path = f.name
+        try:
+            with patch.dict(
+                os.environ,
+                _base_env(YTDL_OPTIONS="{}", YTDL_OPTIONS_FILE=path),
+                clear=False,
+            ):
+                c = Config()
+            self.assertIn("extractor_args", c.YTDL_OPTIONS)
+        finally:
+            os.unlink(path)
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_dl_formats.py

@@ -0,0 +1,139 @@
+"""Tests for ``app.dl_formats`` format selectors and yt-dlp option mapping."""
+
+from __future__ import annotations
+
+import copy
+import unittest
+
+from app.dl_formats import (
+    _normalize_caption_mode,
+    _normalize_subtitle_language,
+    get_format,
+    get_opts,
+)
+
+
+class DlFormatsTests(unittest.TestCase):
+    def test_audio_unknown_format_raises_value_error(self):
+        with self.assertRaises(ValueError):
+            get_format("audio", "auto", "invalid", "best")
+
+    def test_wav_does_not_enable_thumbnail_postprocessing(self):
+        opts = get_opts("audio", "auto", "wav", "best", {})
+        self.assertNotIn("writethumbnail", opts)
+
+    def test_mp3_enables_thumbnail_postprocessing(self):
+        opts = get_opts("audio", "auto", "mp3", "best", {})
+        self.assertTrue(opts.get("writethumbnail"))
+
+    def test_custom_format_passthrough(self):
+        self.assertEqual(get_format("video", "auto", "custom:bestvideo+bestaudio", "best"), "bestvideo+bestaudio")
+
+    def test_thumbnail_and_captions_format_strings(self):
+        self.assertEqual(get_format("thumbnail", "auto", "jpg", "best"), "bestaudio/best")
+        self.assertEqual(get_format("captions", "auto", "srt", "best"), "bestaudio/best")
+
+    def test_audio_formats(self):
+        for fmt in ("m4a", "mp3", "opus", "wav", "flac"):
+            with self.subTest(fmt=fmt):
+                self.assertIn(f"ext={fmt}", get_format("audio", "auto", fmt, "best"))
+
+    def test_video_unknown_format_raises(self):
+        with self.assertRaises(ValueError):
+            get_format("video", "auto", "mkv", "best")
+
+    def test_unknown_download_type_raises(self):
+        with self.assertRaises(ValueError):
+            get_format("unknown", "auto", "any", "best")
+
+    def test_video_any_mp4_ios_with_height_quality(self):
+        self.assertIn("height<=1080", get_format("video", "auto", "any", "1080"))
+        self.assertNotIn("height<=", get_format("video", "auto", "any", "best"))
+        self.assertNotIn("height<=", get_format("video", "auto", "any", "worst"))
+
+    def test_video_codec_filters(self):
+        self.assertIn("h264", get_format("video", "h264", "any", "best"))
+        self.assertIn("hevc", get_format("video", "h265", "any", "best"))
+        self.assertIn("av0?1", get_format("video", "av1", "any", "best"))
+        self.assertIn("vp0?9", get_format("video", "vp9", "any", "best"))
+
+    def test_video_mp4_includes_m4a_audio(self):
+        s = get_format("video", "auto", "mp4", "720")
+        self.assertIn("[ext=m4a]", s)
+
+    def test_video_ios_selector_contains_avc_pattern(self):
+        s = get_format("video", "auto", "ios", "best")
+        self.assertIn("h26[45]", s)
+
+    def test_get_opts_deepcopy_does_not_mutate_input(self):
+        base = {"postprocessors": [{"key": "Existing"}]}
+        orig = copy.deepcopy(base)
+        get_opts("audio", "auto", "mp3", "best", base)
+        self.assertEqual(base, orig)
+
+    def test_get_opts_audio_m4a_postprocessors(self):
+        opts = get_opts("audio", "auto", "m4a", "best", {})
+        keys = [p["key"] for p in opts["postprocessors"]]
+        self.assertIn("FFmpegExtractAudio", keys)
+
+    def test_get_opts_audio_mp3_quality_not_best(self):
+        opts = get_opts("audio", "auto", "mp3", "192", {})
+        ext = next(p for p in opts["postprocessors"] if p["key"] == "FFmpegExtractAudio")
+        self.assertEqual(ext["preferredquality"], "192")
+
+    def test_get_opts_thumbnail_skip_download(self):
+        opts = get_opts("thumbnail", "auto", "jpg", "best", {})
+        self.assertTrue(opts.get("skip_download"))
+        self.assertTrue(opts.get("writethumbnail"))
+
+    def test_get_opts_captions_manual_only(self):
+        opts = get_opts(
+            "captions", "auto", "vtt", "best", {}, subtitle_language="fr", subtitle_mode="manual_only"
+        )
+        self.assertTrue(opts.get("writesubtitles"))
+        self.assertFalse(opts.get("writeautomaticsub"))
+        self.assertEqual(opts["subtitleslangs"], ["fr"])
+
+    def test_get_opts_captions_auto_only(self):
+        opts = get_opts(
+            "captions", "auto", "srt", "best", {}, subtitle_language="de", subtitle_mode="auto_only"
+        )
+        self.assertFalse(opts.get("writesubtitles"))
+        self.assertTrue(opts.get("writeautomaticsub"))
+        self.assertEqual(opts["subtitleslangs"], ["de-orig", "de"])
+
+    def test_get_opts_captions_prefer_auto(self):
+        opts = get_opts(
+            "captions", "auto", "srt", "best", {}, subtitle_language="es", subtitle_mode="prefer_auto"
+        )
+        self.assertTrue(opts.get("writesubtitles"))
+        self.assertTrue(opts.get("writeautomaticsub"))
+        self.assertEqual(opts["subtitleslangs"], ["es-orig", "es"])
+
+    def test_get_opts_captions_prefer_manual_default_branch(self):
+        opts = get_opts(
+            "captions", "auto", "srt", "best", {}, subtitle_language="it", subtitle_mode="prefer_manual"
+        )
+        self.assertEqual(opts["subtitleslangs"], ["it", "it-orig"])
+
+    def test_get_opts_captions_txt_maps_to_srt_format(self):
+        opts = get_opts("captions", "auto", "txt", "best", {})
+        self.assertEqual(opts["subtitlesformat"], "srt")
+
+    def test_get_opts_merges_existing_postprocessors(self):
+        opts = get_opts("audio", "auto", "opus", "best", {"postprocessors": [{"key": "SponsorBlock"}]})
+        keys = [p["key"] for p in opts["postprocessors"]]
+        self.assertIn("SponsorBlock", keys)
+        self.assertIn("FFmpegExtractAudio", keys)
+
+    def test_normalize_caption_mode_invalid_defaults(self):
+        self.assertEqual(_normalize_caption_mode(""), "prefer_manual")
+        self.assertEqual(_normalize_caption_mode("not_a_mode"), "prefer_manual")
+
+    def test_normalize_subtitle_language_empty_defaults_en(self):
+        self.assertEqual(_normalize_subtitle_language(""), "en")
+        self.assertEqual(_normalize_subtitle_language("  "), "en")
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_download_queue.py

@@ -0,0 +1,177 @@
+"""Tests for ``DownloadQueue`` with mocked yt-dlp extraction."""
+
+from __future__ import annotations
+
+import os
+import tempfile
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+
+from ytdl import DownloadQueue
+
+
+@pytest.fixture
+def dq_env():
+    with tempfile.TemporaryDirectory() as tmp:
+        dl = os.path.join(tmp, "downloads")
+        st = os.path.join(tmp, "state")
+        os.makedirs(dl, exist_ok=True)
+        os.makedirs(st, exist_ok=True)
+        cfg = MagicMock()
+        cfg.STATE_DIR = st
+        cfg.DOWNLOAD_DIR = dl
+        cfg.AUDIO_DOWNLOAD_DIR = dl
+        cfg.TEMP_DIR = dl
+        cfg.MAX_CONCURRENT_DOWNLOADS = "3"
+        cfg.YTDL_OPTIONS = {}
+        cfg.CUSTOM_DIRS = True
+        cfg.CREATE_CUSTOM_DIRS = True
+        cfg.CLEAR_COMPLETED_AFTER = "0"
+        cfg.DELETE_FILE_ON_TRASHCAN = False
+        cfg.OUTPUT_TEMPLATE = "%(title)s.%(ext)s"
+        cfg.OUTPUT_TEMPLATE_CHAPTER = "%(title)s.%(ext)s"
+        cfg.OUTPUT_TEMPLATE_PLAYLIST = ""
+        cfg.OUTPUT_TEMPLATE_CHANNEL = ""
+        yield cfg
+
+
+def test_cancel_add_increments_generation(dq_env):
+    notifier = MagicMock()
+    dq = DownloadQueue(dq_env, notifier)
+    before = dq._add_generation
+    dq.cancel_add()
+    assert dq._add_generation == before + 1
+
+
+def test_get_returns_tuple_of_lists(dq_env):
+    notifier = MagicMock()
+    dq = DownloadQueue(dq_env, notifier)
+    q, done = dq.get()
+    assert q == [] and done == []
+
+
+@pytest.mark.asyncio
+async def test_add_single_video_goes_to_pending_when_auto_start_false(dq_env):
+    notifier = AsyncMock()
+
+    def fake_extract(self, url):
+        return {
+            "_type": "video",
+            "id": "vid1",
+            "title": "Test Video",
+            "url": url,
+            "webpage_url": url,
+        }
+
+    dq = DownloadQueue(dq_env, notifier)
+    with patch.object(DownloadQueue, "_DownloadQueue__extract_info", fake_extract):
+        result = await dq.add(
+            "https://example.com/watch?v=1",
+            "video",
+            "auto",
+            "any",
+            "best",
+            "",
+            "",
+            0,
+            auto_start=False,
+        )
+    assert result["status"] == "ok"
+    assert dq.pending.exists("https://example.com/watch?v=1")
+
+
+@pytest.mark.asyncio
+async def test_cancel_removes_from_pending(dq_env):
+    notifier = AsyncMock()
+
+    def fake_extract(self, url):
+        return {
+            "_type": "video",
+            "id": "vid1",
+            "title": "Test Video",
+            "url": url,
+            "webpage_url": url,
+        }
+
+    dq = DownloadQueue(dq_env, notifier)
+    with patch.object(DownloadQueue, "_DownloadQueue__extract_info", fake_extract):
+        await dq.add(
+            "https://example.com/pending",
+            "video",
+            "auto",
+            "any",
+            "best",
+            "",
+            "",
+            0,
+            auto_start=False,
+        )
+    url = "https://example.com/pending"
+    await dq.cancel([url])
+    assert not dq.pending.exists(url)
+    notifier.canceled.assert_awaited()
+
+
+@pytest.mark.asyncio
+async def test_start_pending_moves_to_queue(dq_env):
+    notifier = AsyncMock()
+
+    def fake_extract(self, url):
+        return {
+            "_type": "video",
+            "id": "vid1",
+            "title": "Test Video",
+            "url": url,
+            "webpage_url": url,
+        }
+
+    dq = DownloadQueue(dq_env, notifier)
+    with patch.object(DownloadQueue, "_DownloadQueue__extract_info", fake_extract):
+        await dq.add(
+            "https://example.com/startme",
+            "video",
+            "auto",
+            "any",
+            "best",
+            "",
+            "",
+            0,
+            auto_start=False,
+        )
+    url = "https://example.com/startme"
+    # Starting will spawn real download — cancel immediately before worker runs much
+    with patch.object(DownloadQueue, "_DownloadQueue__start_download", AsyncMock()):
+        await dq.start_pending([url])
+    assert not dq.pending.exists(url)
+
+
+@pytest.mark.asyncio
+async def test_add_entry_queues_single_video_without_reextracting(dq_env):
+    notifier = AsyncMock()
+    dq = DownloadQueue(dq_env, notifier)
+    entry = {
+        "_type": "video",
+        "id": "vid1",
+        "title": "Test Video",
+        "url": "https://example.com/watch?v=1",
+        "webpage_url": "https://example.com/watch?v=1",
+        "playlist_index": "01",
+        "playlist_title": "Playlist",
+    }
+
+    with patch.object(DownloadQueue, "_DownloadQueue__extract_info", side_effect=AssertionError("should not re-extract")):
+        result = await dq.add_entry(
+            entry,
+            "video",
+            "auto",
+            "any",
+            "best",
+            "",
+            "",
+            0,
+            auto_start=False,
+        )
+
+    assert result["status"] == "ok"
+    assert dq.pending.exists("https://example.com/watch?v=1")

app/tests/test_main_helpers.py

@@ -0,0 +1,105 @@
+"""Tests for pure helpers in ``main`` (legacy API migration, logging, JSON serializer)."""
+
+from __future__ import annotations
+
+import json
+import logging
+import unittest
+
+import main
+
+
+class MigrateLegacyRequestTests(unittest.TestCase):
+    def test_already_new_schema_unchanged(self):
+        post = {"download_type": "video", "codec": "h264", "format": "mp4", "quality": "1080"}
+        before = post.copy()
+        self.assertIs(main._migrate_legacy_request(post), post)
+        self.assertEqual(post, before)
+
+    def test_legacy_audio_m4a(self):
+        post = {"format": "m4a", "quality": "best"}
+        main._migrate_legacy_request(post)
+        self.assertEqual(post["download_type"], "audio")
+        self.assertEqual(post["codec"], "auto")
+        self.assertEqual(post["format"], "m4a")
+
+    def test_legacy_thumbnail(self):
+        post = {"format": "thumbnail", "quality": "best"}
+        main._migrate_legacy_request(post)
+        self.assertEqual(post["download_type"], "thumbnail")
+        self.assertEqual(post["format"], "jpg")
+        self.assertEqual(post["quality"], "best")
+
+    def test_legacy_captions_with_subtitle_format(self):
+        post = {"format": "captions", "subtitle_format": "vtt", "quality": "best"}
+        main._migrate_legacy_request(post)
+        self.assertEqual(post["download_type"], "captions")
+        self.assertEqual(post["format"], "vtt")
+
+    def test_legacy_video_best_ios(self):
+        post = {"format": "any", "quality": "best_ios", "video_codec": "auto"}
+        main._migrate_legacy_request(post)
+        self.assertEqual(post["download_type"], "video")
+        self.assertEqual(post["format"], "ios")
+        self.assertEqual(post["quality"], "best")
+
+    def test_legacy_video_quality_audio_maps_to_m4a(self):
+        post = {"format": "mp4", "quality": "audio", "video_codec": "h264"}
+        main._migrate_legacy_request(post)
+        self.assertEqual(post["download_type"], "audio")
+        self.assertEqual(post["format"], "m4a")
+        self.assertEqual(post["quality"], "best")
+
+    def test_legacy_video_default(self):
+        post = {"format": "mp4", "quality": "1080", "video_codec": "h265"}
+        main._migrate_legacy_request(post)
+        self.assertEqual(post["download_type"], "video")
+        self.assertEqual(post["codec"], "h265")
+        self.assertEqual(post["format"], "mp4")
+        self.assertEqual(post["quality"], "1080")
+
+
+class ParseLogLevelTests(unittest.TestCase):
+    def test_valid_levels(self):
+        self.assertEqual(main.parseLogLevel("INFO"), logging.INFO)
+        self.assertEqual(main.parseLogLevel("debug"), logging.DEBUG)
+
+    def test_invalid_returns_none(self):
+        self.assertIsNone(main.parseLogLevel("not_a_level"))
+        self.assertIsNone(main.parseLogLevel(123))
+
+
+class ObjectSerializerTests(unittest.TestCase):
+    def test_dict_like_object(self):
+        class Obj:
+            def __init__(self):
+                self.a = 1
+
+        ser = main.ObjectSerializer()
+        self.assertEqual(json.loads(ser.encode(Obj())), {"a": 1})
+
+    def test_generator_becomes_list(self):
+        ser = main.ObjectSerializer()
+
+        def gen():
+            yield 1
+            yield 2
+
+        self.assertEqual(json.loads(ser.encode(gen())), [1, 2])
+
+    def test_string_not_split_to_chars(self):
+        ser = main.ObjectSerializer()
+        self.assertEqual(json.loads(ser.encode("hello")), "hello")
+
+
+class FrontendSafeTests(unittest.TestCase):
+    def test_only_expected_keys(self):
+        safe = main.config.frontend_safe()
+        for key in main.Config._FRONTEND_KEYS:
+            self.assertIn(key, safe)
+        self.assertNotIn("YTDL_OPTIONS", safe)
+        self.assertNotIn("DOWNLOAD_DIR", safe)
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_persistent_queue.py

@@ -0,0 +1,291 @@
+"""Integration tests for ``PersistentQueue`` using the JSON state store."""
+
+from __future__ import annotations
+
+import json
+import os
+import shelve
+import sys
+import tempfile
+import types
+import unittest
+from unittest.mock import patch
+
+fake_yt_dlp = types.ModuleType("yt_dlp")
+fake_networking = types.ModuleType("yt_dlp.networking")
+fake_impersonate = types.ModuleType("yt_dlp.networking.impersonate")
+fake_utils = types.ModuleType("yt_dlp.utils")
+
+
+class _ImpersonateTarget:
+    @staticmethod
+    def from_str(value):
+        return value
+
+
+fake_impersonate.ImpersonateTarget = _ImpersonateTarget
+fake_networking.impersonate = fake_impersonate
+fake_utils.STR_FORMAT_RE_TMPL = r"(?P<prefix>)%\((?P<has_key>{})\)(?P<format>[-0-9.]*{})"
+fake_utils.STR_FORMAT_TYPES = "diouxXeEfFgGcrsa"
+fake_yt_dlp.networking = fake_networking
+fake_yt_dlp.utils = fake_utils
+sys.modules.setdefault("yt_dlp", fake_yt_dlp)
+sys.modules.setdefault("yt_dlp.networking", fake_networking)
+sys.modules.setdefault("yt_dlp.networking.impersonate", fake_impersonate)
+sys.modules.setdefault("yt_dlp.utils", fake_utils)
+
+from ytdl import DownloadInfo, PersistentQueue
+
+
+class _FakeDownload:
+    __slots__ = ("info",)
+
+    def __init__(self, info: DownloadInfo):
+        self.info = info
+
+
+def _make_info(url: str = "https://example.com/v") -> DownloadInfo:
+    return DownloadInfo(
+        id="id1",
+        title="Title",
+        url=url,
+        quality="best",
+        download_type="video",
+        codec="auto",
+        format="any",
+        folder="",
+        custom_name_prefix="",
+        error=None,
+        entry=None,
+        playlist_item_limit=0,
+        split_by_chapters=False,
+        chapter_template="",
+    )
+
+
+def _create_legacy_shelf(path: str, *infos: DownloadInfo) -> None:
+    with shelve.open(path, "c") as shelf:
+        for info in infos:
+            shelf[info.url] = info
+
+
+class PersistentQueueTests(unittest.TestCase):
+    def test_put_get_delete_roundtrip(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq = PersistentQueue("queue", path)
+            dl = _FakeDownload(_make_info("http://a.example"))
+            pq.put(dl)
+            self.assertTrue(os.path.exists(path + ".json"))
+            self.assertTrue(pq.exists("http://a.example"))
+            self.assertFalse(pq.empty())
+            got = pq.get("http://a.example")
+            self.assertEqual(got.info.url, "http://a.example")
+            pq.delete("http://a.example")
+            self.assertFalse(pq.exists("http://a.example"))
+
+    def test_saved_items_sorted_by_timestamp(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq = PersistentQueue("queue", path)
+            a = _FakeDownload(_make_info("http://first.example"))
+            b = _FakeDownload(_make_info("http://second.example"))
+            a.info.timestamp = 100
+            b.info.timestamp = 200
+            pq.put(a)
+            pq.put(b)
+            keys = [k for k, _ in pq.saved_items()]
+            self.assertEqual(keys, ["http://first.example", "http://second.example"])
+
+    def test_load_restores_from_json(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq1 = PersistentQueue("queue", path)
+            pq1.put(_FakeDownload(_make_info("http://load.example")))
+            pq2 = PersistentQueue("queue", path)
+            pq2.load()
+            self.assertTrue(pq2.exists("http://load.example"))
+
+    def test_load_imports_legacy_shelve(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            _create_legacy_shelf(path, _make_info("http://legacy.example"))
+            pq = PersistentQueue("queue", path)
+            pq.load()
+            self.assertTrue(pq.exists("http://legacy.example"))
+            self.assertTrue(os.path.exists(path + ".json"))
+
+    def test_queue_persists_only_compact_entry_subset(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq = PersistentQueue("queue", path)
+            info = _make_info("http://entry.example")
+            info.entry = {
+                "playlist_index": "01",
+                "playlist_title": "Playlist",
+                "channel_index": "02",
+                "channel_title": "Channel",
+                "formats": [{"id": "huge"}],
+                "description": "very large payload",
+            }
+            pq.put(_FakeDownload(info))
+
+            with open(path + ".json", encoding="utf-8") as f:
+                payload = json.load(f)
+
+            record = payload["items"][0]["info"]
+            self.assertEqual(
+                record["entry"],
+                {
+                    "playlist_index": "01",
+                    "playlist_title": "Playlist",
+                    "channel_index": "02",
+                    "channel_title": "Channel",
+                },
+            )
+            self.assertNotIn("formats", record["entry"])
+            self.assertNotIn("description", record["entry"])
+
+    def test_completed_queue_does_not_persist_entry_or_transient_progress(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "completed")
+            pq = PersistentQueue("completed", path)
+            info = _make_info("http://done.example")
+            info.status = "finished"
+            info.percent = 88
+            info.speed = 123
+            info.eta = 9
+            info.entry = {
+                "playlist_index": "01",
+                "playlist_title": "Playlist",
+                "formats": [{"id": "huge"}],
+            }
+            info.filename = "done.mp4"
+            pq.put(_FakeDownload(info))
+
+            with open(path + ".json", encoding="utf-8") as f:
+                payload = json.load(f)
+
+            record = payload["items"][0]["info"]
+            self.assertNotIn("entry", record)
+            self.assertNotIn("percent", record)
+            self.assertNotIn("speed", record)
+            self.assertNotIn("eta", record)
+            self.assertEqual(record["filename"], "done.mp4")
+
+    def test_invalid_json_is_quarantined_and_legacy_is_imported(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            _create_legacy_shelf(path, _make_info("http://legacy.example"))
+            with open(path + ".json", "w", encoding="utf-8") as f:
+                f.write("{not valid json")
+
+            pq = PersistentQueue("queue", path)
+            pq.load()
+
+            self.assertTrue(pq.exists("http://legacy.example"))
+            self.assertTrue(
+                any(name.startswith("queue.json.invalid.") for name in os.listdir(tmp))
+            )
+
+    def test_loading_old_json_rewrites_to_compact_format(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            with open(path + ".json", "w", encoding="utf-8") as f:
+                json.dump(
+                    {
+                        "schema_version": 1,
+                        "kind": "persistent_queue:queue",
+                        "items": [
+                            {
+                                "key": "http://legacy-json.example",
+                                "info": {
+                                    "id": "id1",
+                                    "title": "Title",
+                                    "url": "http://legacy-json.example",
+                                    "quality": "best",
+                                    "download_type": "video",
+                                    "codec": "auto",
+                                    "format": "any",
+                                    "folder": "",
+                                    "custom_name_prefix": "",
+                                    "playlist_item_limit": 0,
+                                    "split_by_chapters": False,
+                                    "chapter_template": "",
+                                    "subtitle_language": "en",
+                                    "subtitle_mode": "prefer_manual",
+                                    "status": "pending",
+                                    "timestamp": 1,
+                                    "entry": {
+                                        "playlist_index": "01",
+                                        "playlist_title": "Playlist",
+                                        "formats": [{"id": "huge"}],
+                                    },
+                                    "percent": 15,
+                                    "speed": 20,
+                                    "eta": 30,
+                                },
+                            }
+                        ],
+                    },
+                    f,
+                )
+
+            pq = PersistentQueue("queue", path)
+            pq.load()
+
+            with open(path + ".json", encoding="utf-8") as f:
+                payload = json.load(f)
+
+            record = payload["items"][0]["info"]
+            self.assertEqual(payload["schema_version"], 2)
+            self.assertEqual(record["entry"], {"playlist_index": "01", "playlist_title": "Playlist"})
+            self.assertNotIn("percent", record)
+            self.assertNotIn("speed", record)
+            self.assertNotIn("eta", record)
+
+    def test_put_rollbacks_in_memory_queue_when_state_write_fails(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq = PersistentQueue("queue", path)
+            dl = _FakeDownload(_make_info("http://rollback.example"))
+            self.assertFalse(pq.exists("http://rollback.example"))
+
+            orig_save = __import__("state_store").AtomicJsonStore.save
+
+            def bad_save(store, data):
+                if store.path == path + ".json":
+                    raise OSError("simulated shelf failure")
+                return orig_save(store, data)
+
+            with patch("ytdl.AtomicJsonStore.save", bad_save):
+                with self.assertRaises(OSError):
+                    pq.put(dl)
+
+            self.assertFalse(pq.exists("http://rollback.example"))
+
+    def test_put_rollbacks_to_previous_download_when_replace_fails(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq = PersistentQueue("queue", path)
+            first = _FakeDownload(_make_info("http://same.example"))
+            second = _FakeDownload(_make_info("http://same.example"))
+            second.info.title = "Replaced title"
+            pq.put(first)
+
+            orig_save = __import__("state_store").AtomicJsonStore.save
+
+            def bad_save(store, data):
+                if store.path == path + ".json":
+                    raise OSError("simulated shelf failure")
+                return orig_save(store, data)
+
+            with patch("ytdl.AtomicJsonStore.save", bad_save):
+                with self.assertRaises(OSError):
+                    pq.put(second)
+
+            self.assertEqual(pq.get("http://same.example").info.title, "Title")
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_state_store.py

@@ -0,0 +1,53 @@
+from __future__ import annotations
+
+import os
+import tempfile
+import unittest
+from datetime import datetime
+
+from state_store import AtomicJsonStore, from_json_compatible, to_json_compatible
+
+
+class StateStoreTests(unittest.TestCase):
+    def test_save_and_load_roundtrip(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue.json")
+            store = AtomicJsonStore(path, kind="persistent_queue:queue")
+            store.save({"items": [{"key": "a", "info": {"title": "hello"}}]})
+
+            payload = store.load()
+
+            self.assertEqual(payload["kind"], "persistent_queue:queue")
+            self.assertEqual(payload["schema_version"], 2)
+            self.assertEqual(payload["items"][0]["info"]["title"], "hello")
+
+    def test_invalid_file_is_quarantined(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue.json")
+            with open(path, "w", encoding="utf-8") as f:
+                f.write("{broken")
+
+            store = AtomicJsonStore(path, kind="persistent_queue:queue")
+            payload = store.load()
+
+            self.assertIsNone(payload)
+            self.assertTrue(
+                any(name.startswith("queue.json.invalid.") for name in os.listdir(tmp))
+            )
+
+    def test_json_compat_helpers_roundtrip_bytes_and_datetime(self):
+        raw = {
+            "payload": b"abc",
+            "timestamp": datetime(2024, 1, 2, 3, 4, 5),
+            "items": (1, 2, 3),
+        }
+
+        restored = from_json_compatible(to_json_compatible(raw))
+
+        self.assertEqual(restored["payload"], b"abc")
+        self.assertEqual(restored["timestamp"], datetime(2024, 1, 2, 3, 4, 5))
+        self.assertEqual(restored["items"], [1, 2, 3])
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_subscriptions.py

@@ -0,0 +1,443 @@
+from __future__ import annotations
+
+import json
+import os
+import shelve
+import sys
+import tempfile
+import types
+import unittest
+from unittest.mock import patch
+
+fake_yt_dlp = types.ModuleType("yt_dlp")
+fake_networking = types.ModuleType("yt_dlp.networking")
+fake_impersonate = types.ModuleType("yt_dlp.networking.impersonate")
+
+
+class _ImpersonateTarget:
+    @staticmethod
+    def from_str(value):
+        return value
+
+
+fake_impersonate.ImpersonateTarget = _ImpersonateTarget
+fake_networking.impersonate = fake_impersonate
+fake_yt_dlp.networking = fake_networking
+fake_yt_dlp.utils = types.SimpleNamespace(YoutubeDLError=Exception)
+sys.modules.setdefault("yt_dlp", fake_yt_dlp)
+sys.modules.setdefault("yt_dlp.networking", fake_networking)
+sys.modules.setdefault("yt_dlp.networking.impersonate", fake_impersonate)
+
+from subscriptions import SubscriptionManager, extract_flat_playlist
+
+
+class _Config:
+    def __init__(self, state_dir: str):
+        self.STATE_DIR = state_dir
+        self.SUBSCRIPTION_SCAN_PLAYLIST_END = 50
+        self.SUBSCRIPTION_MAX_SEEN_IDS = 50000
+        self.DOWNLOAD_DIR = state_dir
+        self.TEMP_DIR = state_dir
+        self.YTDL_OPTIONS = {}
+
+
+class _Queue:
+    def __init__(self):
+        self.entries = []
+        self.fail = False
+
+    async def add(self, *args, **kwargs):
+        return None
+
+    async def add_entry(self, entry, *args, **kwargs):
+        if self.fail:
+            return {"status": "error", "msg": "queue failed"}
+        self.entries.append((entry, args, kwargs))
+        return {"status": "ok"}
+
+
+class _Notifier:
+    async def subscription_added(self, sub):
+        return None
+
+    async def subscription_updated(self, sub):
+        return None
+
+    async def subscription_removed(self, sub_id):
+        return None
+
+    async def subscriptions_all(self, subs):
+        return None
+
+
+def _create_legacy_shelf(path: str, record) -> None:
+    with shelve.open(path, "c") as shelf:
+        shelf["sub-1"] = record
+
+
+class SubscriptionPersistenceTests(unittest.IsolatedAsyncioTestCase):
+    def test_load_imports_legacy_subscription_shelf(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            legacy_path = os.path.join(tmp, "subscriptions")
+            json_path = os.path.join(tmp, "subscriptions.json")
+            _create_legacy_shelf(
+                legacy_path,
+                {
+                    "id": "sub-1",
+                    "name": "Channel",
+                    "url": "https://example.com/channel",
+                    "timestamp": 1.0,
+                },
+            )
+
+            mgr = SubscriptionManager(_Config(tmp), _Queue(), _Notifier())
+
+            self.assertEqual(len(mgr.list_all()), 1)
+            self.assertTrue(os.path.exists(json_path))
+            with open(json_path, encoding="utf-8") as f:
+                payload = json.load(f)
+            self.assertEqual(payload["schema_version"], 2)
+            self.assertNotIn("timestamp", payload["items"][0])
+
+    def test_invalid_json_is_quarantined_and_legacy_is_imported(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            legacy_path = os.path.join(tmp, "subscriptions")
+            json_path = os.path.join(tmp, "subscriptions.json")
+            _create_legacy_shelf(
+                legacy_path,
+                {
+                    "id": "sub-1",
+                    "name": "Channel",
+                    "url": "https://example.com/channel",
+                    "timestamp": 1.0,
+                },
+            )
+            with open(json_path, "w", encoding="utf-8") as f:
+                f.write("{not valid json")
+
+            mgr = SubscriptionManager(_Config(tmp), _Queue(), _Notifier())
+
+            self.assertEqual(len(mgr.list_all()), 1)
+            self.assertTrue(
+                any(name.startswith("subscriptions.json.invalid.") for name in os.listdir(tmp))
+            )
+
+    def test_load_rewrites_old_json_and_trims_seen_ids(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            json_path = os.path.join(tmp, "subscriptions.json")
+            cfg = _Config(tmp)
+            cfg.SUBSCRIPTION_MAX_SEEN_IDS = 2
+            with open(json_path, "w", encoding="utf-8") as f:
+                json.dump(
+                    {
+                        "schema_version": 1,
+                        "kind": "subscriptions",
+                        "items": [
+                            {
+                                "id": "sub-1",
+                                "name": "Channel",
+                                "url": "https://example.com/channel",
+                                "enabled": True,
+                                "check_interval_minutes": 60,
+                                "download_type": "video",
+                                "codec": "auto",
+                                "format": "any",
+                                "quality": "best",
+                                "folder": "",
+                                "custom_name_prefix": "",
+                                "auto_start": True,
+                                "playlist_item_limit": 0,
+                                "split_by_chapters": False,
+                                "chapter_template": "",
+                                "subtitle_language": "en",
+                                "subtitle_mode": "prefer_manual",
+                                "last_checked": None,
+                                "seen_ids": ["a", "b", "a", "c"],
+                                "error": None,
+                                "timestamp": 123,
+                            }
+                        ],
+                    },
+                    f,
+                )
+
+            mgr = SubscriptionManager(cfg, _Queue(), _Notifier())
+            self.assertEqual(mgr.list_all()[0].seen_ids, ["a", "b"])
+
+            with open(json_path, encoding="utf-8") as f:
+                payload = json.load(f)
+
+            self.assertEqual(payload["schema_version"], 2)
+            self.assertEqual(payload["items"][0]["seen_ids"], ["a", "b"])
+            self.assertNotIn("timestamp", payload["items"][0])
+
+    async def test_add_subscription_rolls_back_when_state_write_fails(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            mgr = SubscriptionManager(_Config(tmp), _Queue(), _Notifier())
+
+            orig_save = __import__("state_store").AtomicJsonStore.save
+
+            def bad_save(store, data):
+                if store.path == mgr._path:
+                    raise OSError("simulated shelf failure")
+                return orig_save(store, data)
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                return_value=(
+                    {"_type": "channel", "title": "Channel"},
+                    [{"id": "v1", "webpage_url": "https://example.com/v1"}],
+                ),
+            ):
+                with patch("subscriptions.AtomicJsonStore.save", bad_save):
+                    with self.assertRaises(OSError):
+                        await mgr.add_subscription(
+                            "https://example.com/channel",
+                            check_interval_minutes=60,
+                            download_type="video",
+                            codec="auto",
+                            format="any",
+                            quality="best",
+                            folder="",
+                            custom_name_prefix="",
+                            auto_start=True,
+                            playlist_item_limit=0,
+                            split_by_chapters=False,
+                            chapter_template="",
+                            subtitle_language="en",
+                            subtitle_mode="prefer_manual",
+                        )
+
+            self.assertEqual(mgr.list_all(), [])
+            self.assertNotIn("https://example.com/channel", mgr._url_index)
+
+    async def test_add_subscription_marks_existing_videos_seen_without_queueing(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            queue = _Queue()
+            mgr = SubscriptionManager(_Config(tmp), queue, _Notifier())
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                return_value=(
+                    {"_type": "channel", "title": "Channel"},
+                    [
+                        {"id": "v1", "title": "One", "webpage_url": "https://example.com/v1"},
+                        {"id": "v2", "title": "Two", "webpage_url": "https://example.com/v2"},
+                        {"id": "v3", "title": "Three", "webpage_url": "https://example.com/v3"},
+                    ],
+                ),
+            ):
+                result = await mgr.add_subscription(
+                    "https://example.com/channel",
+                    check_interval_minutes=60,
+                    download_type="video",
+                    codec="auto",
+                    format="any",
+                    quality="best",
+                    folder="",
+                    custom_name_prefix="",
+                    auto_start=True,
+                    playlist_item_limit=0,
+                    split_by_chapters=False,
+                    chapter_template="",
+                    subtitle_language="en",
+                    subtitle_mode="prefer_manual",
+                )
+
+            assert result["status"] == "ok"
+            sub = mgr.list_all()[0]
+            self.assertEqual(sub.seen_ids, ["v1", "v2", "v3"])
+            self.assertIsNone(sub.error)
+            self.assertEqual(queue.entries, [])
+
+    async def test_add_subscription_skips_collection_tab_entries(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            queue = _Queue()
+            mgr = SubscriptionManager(_Config(tmp), queue, _Notifier())
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                return_value=(
+                    {"_type": "channel", "title": "Channel"},
+                    [
+                        {
+                            "_type": "url",
+                            "ie_key": "YoutubeTab",
+                            "title": "Channel - Live",
+                            "url": "https://example.com/live",
+                            "webpage_url": "https://example.com/live",
+                        },
+                        {
+                            "_type": "url",
+                            "ie_key": "Youtube",
+                            "id": "v1",
+                            "title": "One",
+                            "duration": 10,
+                            "webpage_url": "https://example.com/v1",
+                        },
+                    ],
+                ),
+            ):
+                result = await mgr.add_subscription(
+                    "https://example.com/channel",
+                    check_interval_minutes=60,
+                    download_type="video",
+                    codec="auto",
+                    format="any",
+                    quality="best",
+                    folder="",
+                    custom_name_prefix="",
+                    auto_start=True,
+                    playlist_item_limit=0,
+                    split_by_chapters=False,
+                    chapter_template="",
+                    subtitle_language="en",
+                    subtitle_mode="prefer_manual",
+                )
+
+            self.assertEqual(result["status"], "ok")
+            sub = mgr.list_all()[0]
+            self.assertEqual(sub.seen_ids, ["v1"])
+            self.assertEqual(queue.entries, [])
+
+    async def test_check_now_keeps_failed_queue_items_unseen_and_sets_error(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            queue = _Queue()
+            mgr = SubscriptionManager(_Config(tmp), queue, _Notifier())
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                side_effect=[
+                    (
+                        {"_type": "channel", "title": "Channel"},
+                        [{"id": "v1", "title": "One", "webpage_url": "https://example.com/v1"}],
+                    ),
+                    (
+                        {"_type": "channel", "title": "Channel"},
+                        [{"id": "v2", "title": "Two", "webpage_url": "https://example.com/v2"}],
+                    ),
+                ],
+            ):
+                result = await mgr.add_subscription(
+                    "https://example.com/channel",
+                    check_interval_minutes=60,
+                    download_type="video",
+                    codec="auto",
+                    format="any",
+                    quality="best",
+                    folder="",
+                    custom_name_prefix="",
+                    auto_start=True,
+                    playlist_item_limit=0,
+                    split_by_chapters=False,
+                    chapter_template="",
+                    subtitle_language="en",
+                    subtitle_mode="prefer_manual",
+                )
+                queue.fail = True
+                await mgr.check_now([result["subscription"]["id"]])
+
+            sub = mgr.list_all()[0]
+            self.assertEqual(sub.error, "queue failed")
+            self.assertEqual(sub.seen_ids, ["v1"])
+
+    async def test_check_now_queues_new_video_and_updates_seen_ids(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            queue = _Queue()
+            mgr = SubscriptionManager(_Config(tmp), queue, _Notifier())
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                side_effect=[
+                    (
+                        {"_type": "channel", "title": "Channel"},
+                        [{"id": "v1", "title": "One", "webpage_url": "https://example.com/v1"}],
+                    ),
+                    (
+                        {"_type": "channel", "title": "Channel"},
+                        [
+                            {"id": "v2", "title": "Two", "webpage_url": "https://example.com/v2"},
+                            {"id": "v1", "title": "One", "webpage_url": "https://example.com/v1"},
+                        ],
+                    ),
+                ],
+            ):
+                result = await mgr.add_subscription(
+                    "https://example.com/channel",
+                    check_interval_minutes=60,
+                    download_type="video",
+                    codec="auto",
+                    format="any",
+                    quality="best",
+                    folder="",
+                    custom_name_prefix="",
+                    auto_start=True,
+                    playlist_item_limit=0,
+                    split_by_chapters=False,
+                    chapter_template="",
+                    subtitle_language="en",
+                    subtitle_mode="prefer_manual",
+                )
+                await mgr.check_now([result["subscription"]["id"]])
+
+            sub = mgr.list_all()[0]
+            self.assertIsNotNone(sub.last_checked)
+            self.assertIsNone(sub.error)
+            self.assertEqual(sub.seen_ids[:2], ["v2", "v1"])
+            self.assertEqual([entry["webpage_url"] for entry, _, _ in queue.entries], ["https://example.com/v2"])
+
+class ExtractFlatPlaylistTests(unittest.TestCase):
+    def test_descends_one_level_when_root_entries_are_nested_collections(self):
+        responses = iter(
+            [
+                {
+                    "_type": "channel",
+                    "entries": [
+                        {
+                            "_type": "url",
+                            "ie_key": "YoutubeTab",
+                            "title": "Channel - Videos",
+                            "url": "https://example.com/videos",
+                            "webpage_url": "https://example.com/videos",
+                        }
+                    ],
+                },
+                {
+                    "_type": "playlist",
+                    "entries": [
+                        {
+                            "_type": "url",
+                            "ie_key": "Youtube",
+                            "id": "v1",
+                            "title": "One",
+                            "duration": 10,
+                            "webpage_url": "https://example.com/v1",
+                        }
+                    ],
+                },
+            ]
+        )
+
+        class _FakeYDL:
+            def __init__(self, params):
+                self.params = params
+
+            def __enter__(self):
+                return self
+
+            def __exit__(self, exc_type, exc, tb):
+                return False
+
+            def extract_info(self, url, download=False):
+                return next(responses)
+
+        cfg = _Config(tempfile.mkdtemp())
+        with patch("subscriptions.yt_dlp.YoutubeDL", _FakeYDL, create=True):
+            info, entries = extract_flat_playlist(cfg, "https://example.com/channel", 50)
+
+        self.assertEqual(info.get("_type"), "playlist")
+        self.assertEqual([entry["webpage_url"] for entry in entries], ["https://example.com/v1"])
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_ytdl_utils.py

@@ -0,0 +1,245 @@
+"""Tests for pure helpers and migration logic in ``ytdl``."""
+
+from __future__ import annotations
+
+import pickle
+import sys
+import tempfile
+import threading
+import types
+import unittest
+from pathlib import Path
+
+fake_yt_dlp = types.ModuleType("yt_dlp")
+fake_networking = types.ModuleType("yt_dlp.networking")
+fake_impersonate = types.ModuleType("yt_dlp.networking.impersonate")
+fake_utils = types.ModuleType("yt_dlp.utils")
+
+
+class _ImpersonateTarget:
+    @staticmethod
+    def from_str(value):
+        return value
+
+
+fake_impersonate.ImpersonateTarget = _ImpersonateTarget
+fake_networking.impersonate = fake_impersonate
+fake_utils.STR_FORMAT_RE_TMPL = r"(?P<prefix>)%\((?P<has_key>{})\)(?P<format>[-0-9.]*{})"
+fake_utils.STR_FORMAT_TYPES = "diouxXeEfFgGcrsa"
+fake_yt_dlp.networking = fake_networking
+fake_yt_dlp.utils = fake_utils
+sys.modules.setdefault("yt_dlp", fake_yt_dlp)
+sys.modules.setdefault("yt_dlp.networking", fake_networking)
+sys.modules.setdefault("yt_dlp.networking.impersonate", fake_impersonate)
+sys.modules.setdefault("yt_dlp.utils", fake_utils)
+
+from ytdl import (
+    DownloadInfo,
+    _compact_persisted_entry,
+    _convert_srt_to_txt_file,
+    _outtmpl_substitute_field,
+    _sanitize_entry_for_pickle,
+    _sanitize_path_component,
+)
+
+
+class SanitizePathComponentTests(unittest.TestCase):
+    def test_replaces_windows_invalid_chars(self):
+        self.assertEqual(_sanitize_path_component('a:b*c?d"e<f>g|h'), "a_b_c_d_e_f_g_h")
+
+    def test_non_string_passthrough(self):
+        self.assertIs(_sanitize_path_component(None), None)
+        self.assertEqual(_sanitize_path_component(42), 42)
+
+
+class OuttmplSubstituteFieldTests(unittest.TestCase):
+    def test_simple_substitution(self):
+        self.assertEqual(_outtmpl_substitute_field("%(title)s", "title", "Hello"), "Hello")
+
+    def test_format_spec_int(self):
+        self.assertEqual(_outtmpl_substitute_field("%(idx)02d", "idx", 3), "03")
+
+    def test_missing_field_unchanged(self):
+        self.assertEqual(_outtmpl_substitute_field("%(other)s", "title", "x"), "%(other)s")
+
+
+class SanitizeEntryForPickleTests(unittest.TestCase):
+    def test_nested(self):
+        def g():
+            yield 1
+
+        obj = {"a": g(), "b": [g()]}
+        out = _sanitize_entry_for_pickle(obj)
+        self.assertEqual(out, {"a": [1], "b": [[1]]})
+        pickle.dumps(out)
+
+    def test_plain(self):
+        self.assertEqual(_sanitize_entry_for_pickle(5), 5)
+
+    def test_set_converted_to_list(self):
+        obj = {"s": {1, 2}}
+        out = _sanitize_entry_for_pickle(obj)
+        self.assertEqual(sorted(out["s"]), [1, 2])
+        pickle.dumps(out)
+
+    def test_map_iterator(self):
+        out = _sanitize_entry_for_pickle({"m": map(int, ["1", "2"])})
+        self.assertEqual(out, {"m": [1, 2]})
+
+    def test_lock_replaced_with_none(self):
+        lock = threading.Lock()
+        out = _sanitize_entry_for_pickle({"k": lock})
+        self.assertIsNone(out["k"])
+        pickle.dumps(out)
+
+    def test_ordered_dict(self):
+        from collections import OrderedDict
+
+        od = OrderedDict([("z", 1), ("a", 2)])
+        out = _sanitize_entry_for_pickle(od)
+        self.assertEqual(out, {"z": 1, "a": 2})
+
+
+class ConvertSrtToTxtTests(unittest.TestCase):
+    def test_basic_conversion(self):
+        srt = """1
+00:00:01,000 --> 00:00:02,000
+Hello <b>world</b>
+
+2
+00:00:03,000 --> 00:00:04,000
+Second line
+"""
+        with tempfile.TemporaryDirectory() as tmp:
+            path = Path(tmp) / "sub.srt"
+            path.write_text(srt, encoding="utf-8")
+            txt_path = _convert_srt_to_txt_file(str(path))
+            self.assertIsNotNone(txt_path)
+            self.assertTrue(txt_path.endswith(".txt"))
+            content = Path(txt_path).read_text(encoding="utf-8")
+            self.assertIn("Hello world", content)
+            self.assertIn("Second line", content)
+
+
+class DownloadInfoSetstateTests(unittest.TestCase):
+    def _base_state(self, **kwargs):
+        base = {
+            "id": "id1",
+            "title": "t",
+            "url": "http://example.com/v",
+            "folder": "",
+            "custom_name_prefix": "",
+            "error": None,
+            "entry": None,
+            "playlist_item_limit": 0,
+            "split_by_chapters": False,
+            "chapter_template": "",
+            "msg": None,
+            "percent": None,
+            "speed": None,
+            "eta": None,
+            "status": "pending",
+            "size": None,
+            "timestamp": 0,
+        }
+        base.update(kwargs)
+        return base
+
+    def test_migrates_old_audio_format(self):
+        state = self._base_state(format="m4a", quality="best")
+        di = DownloadInfo.__new__(DownloadInfo)
+        di.__setstate__(state)
+        self.assertEqual(di.download_type, "audio")
+        self.assertEqual(di.codec, "auto")
+
+    def test_migrates_thumbnail(self):
+        state = self._base_state(format="thumbnail", quality="best")
+        di = DownloadInfo.__new__(DownloadInfo)
+        di.__setstate__(state)
+        self.assertEqual(di.download_type, "thumbnail")
+        self.assertEqual(di.format, "jpg")
+
+    def test_migrates_captions(self):
+        state = self._base_state(format="captions", subtitle_format="vtt", quality="best")
+        di = DownloadInfo.__new__(DownloadInfo)
+        di.__setstate__(state)
+        self.assertEqual(di.download_type, "captions")
+        self.assertEqual(di.format, "vtt")
+
+    def test_migrates_best_ios(self):
+        state = self._base_state(
+            format="any", quality="best_ios", video_codec="auto"
+        )
+        di = DownloadInfo.__new__(DownloadInfo)
+        di.__setstate__(state)
+        self.assertEqual(di.format, "ios")
+        self.assertEqual(di.quality, "best")
+
+    def test_migrates_quality_audio(self):
+        state = self._base_state(format="mp4", quality="audio", video_codec="h264")
+        di = DownloadInfo.__new__(DownloadInfo)
+        di.__setstate__(state)
+        self.assertEqual(di.download_type, "audio")
+        self.assertEqual(di.format, "m4a")
+
+    def test_new_state_has_subtitle_files(self):
+        state = self._base_state(
+            download_type="video",
+            codec="auto",
+            format="any",
+            quality="best",
+        )
+        di = DownloadInfo.__new__(DownloadInfo)
+        di.__setstate__(state)
+        self.assertEqual(di.subtitle_files, [])
+
+    def test_missing_optional_fields_are_defaulted(self):
+        state = self._base_state(
+            download_type="video",
+            codec="auto",
+            format="any",
+            quality="best",
+        )
+        state.pop("folder")
+        state.pop("custom_name_prefix")
+        state.pop("playlist_item_limit")
+        state.pop("split_by_chapters")
+        state.pop("chapter_template")
+        di = DownloadInfo.__new__(DownloadInfo)
+        di.__setstate__(state)
+        self.assertEqual(di.folder, "")
+        self.assertEqual(di.custom_name_prefix, "")
+        self.assertEqual(di.playlist_item_limit, 0)
+        self.assertFalse(di.split_by_chapters)
+        self.assertEqual(di.chapter_template, "")
+
+
+class CompactPersistedEntryTests(unittest.TestCase):
+    def test_keeps_only_playlist_and_channel_keys(self):
+        entry = {
+            "playlist_index": "01",
+            "playlist_title": "Playlist",
+            "channel_index": "02",
+            "channel_title": "Channel",
+            "formats": [{"id": "huge"}],
+            "description": "big blob",
+        }
+
+        compact = _compact_persisted_entry(entry)
+
+        self.assertEqual(
+            compact,
+            {
+                "playlist_index": "01",
+                "playlist_title": "Playlist",
+                "channel_index": "02",
+                "channel_title": "Channel",
+            },
+        )
+
+    def test_returns_none_when_no_restart_relevant_keys_exist(self):
+        self.assertIsNone(_compact_persisted_entry({"id": "x", "title": "y"}))
+
+
+if __name__ == "__main__":
+    unittest.main()

app/ytdl.py

@@ -1,23 +1,25 @@
 import os
 import shutil
 import yt_dlp
+import collections
+import collections.abc
+import copy
+import pickle
 from collections import OrderedDict
-import shelve
 import time
 import asyncio
 import multiprocessing
 import logging
 import re
 import types
-import dbm
-import subprocess
-from typing import Any
+from typing import Any, Optional
 from functools import lru_cache
 
 import yt_dlp.networking.impersonate
 from yt_dlp.utils import STR_FORMAT_RE_TMPL, STR_FORMAT_TYPES
 from dl_formats import get_format, get_opts, AUDIO_FORMATS
 from datetime import datetime
+from state_store import AtomicJsonStore, from_json_compatible, read_legacy_shelf, to_json_compatible
 
 log = logging.getLogger('ytdl')
 
@@ -78,16 +80,40 @@ def _outtmpl_substitute_field(template: str, field: str, value: Any) -> str:
 
     return pattern.sub(replacement, template)
 
-def _convert_generators_to_lists(obj):
-    """Recursively convert generators to lists in a dictionary to make it pickleable."""
-    if isinstance(obj, types.GeneratorType):
-        return list(obj)
-    elif isinstance(obj, dict):
-        return {k: _convert_generators_to_lists(v) for k, v in obj.items()}
-    elif isinstance(obj, (list, tuple)):
-        return type(obj)(_convert_generators_to_lists(item) for item in obj)
-    else:
+_MAX_ENTRY_SANITIZE_DEPTH = 64
+
+
+def _sanitize_entry_for_pickle(obj, _depth=0):
+    """Recursively normalize yt-dlp ``info_dict`` data so it can be stored in shelve/pickle.
+
+    Live streams and newer yt-dlp versions may nest generators, iterators, sets, or
+    non-serializable objects (e.g. locks) inside the extracted metadata. The previous
+    helper only walked plain dict/list/tuple and only expanded ``types.GeneratorType``.
+    """
+    if _depth > _MAX_ENTRY_SANITIZE_DEPTH:
+        return None
+    if obj is None or isinstance(obj, (bool, int, float, str, bytes)):
         return obj
+    if isinstance(obj, types.GeneratorType):
+        return _sanitize_entry_for_pickle(list(obj), _depth + 1)
+    if isinstance(obj, collections.abc.Mapping):
+        return {k: _sanitize_entry_for_pickle(v, _depth + 1) for k, v in obj.items()}
+    if isinstance(obj, (list, tuple)):
+        return type(obj)(_sanitize_entry_for_pickle(x, _depth + 1) for x in obj)
+    if isinstance(obj, (set, frozenset)):
+        return [_sanitize_entry_for_pickle(x, _depth + 1) for x in obj]
+    if isinstance(obj, collections.deque):
+        return [_sanitize_entry_for_pickle(x, _depth + 1) for x in obj]
+    if isinstance(obj, collections.abc.Iterator):
+        try:
+            return _sanitize_entry_for_pickle(list(obj), _depth + 1)
+        except Exception:
+            return None
+    try:
+        pickle.dumps(obj, protocol=pickle.HIGHEST_PROTOCOL)
+        return obj
+    except Exception:
+        return None
 
 
 def _convert_srt_to_txt_file(subtitle_path: str):
@@ -151,6 +177,8 @@ class DownloadInfo:
         title,
         url,
         quality,
+        download_type,
+        codec,
         format,
         folder,
         custom_name_prefix,
@@ -159,7 +187,6 @@ class DownloadInfo:
         playlist_item_limit,
         split_by_chapters,
         chapter_template,
-        subtitle_format="srt",
         subtitle_language="en",
         subtitle_mode="prefer_manual",
     ):
@@ -167,6 +194,8 @@ class DownloadInfo:
         self.title = title if len(custom_name_prefix) == 0 else f'{custom_name_prefix}.{title}'
         self.url = url
         self.quality = quality
+        self.download_type = download_type
+        self.codec = codec
         self.format = format
         self.folder = folder
         self.custom_name_prefix = custom_name_prefix
@@ -175,31 +204,173 @@ class DownloadInfo:
         self.size = None
         self.timestamp = time.time_ns()
         self.error = error
-        # Convert generators to lists to make entry pickleable
-        self.entry = _convert_generators_to_lists(entry) if entry is not None else None
+        # Strip non-pickleable values (generators, iterators, locks, etc.) for shelve
+        self.entry = _sanitize_entry_for_pickle(entry) if entry is not None else None
         self.playlist_item_limit = playlist_item_limit
         self.split_by_chapters = split_by_chapters
         self.chapter_template = chapter_template
-        self.subtitle_format = subtitle_format
         self.subtitle_language = subtitle_language
         self.subtitle_mode = subtitle_mode
         self.subtitle_files = []
 
+    def __setstate__(self, state):
+        """BACKWARD COMPATIBILITY: migrate old DownloadInfo from persistent queue files."""
+        self.__dict__.update(state)
+        if 'download_type' not in state:
+            old_format = state.get('format', 'any')
+            old_video_codec = state.get('video_codec', 'auto')
+            old_quality = state.get('quality', 'best')
+            old_subtitle_format = state.get('subtitle_format', 'srt')
+
+            if old_format in AUDIO_FORMATS:
+                self.download_type = 'audio'
+                self.codec = 'auto'
+            elif old_format == 'thumbnail':
+                self.download_type = 'thumbnail'
+                self.codec = 'auto'
+                self.format = 'jpg'
+            elif old_format == 'captions':
+                self.download_type = 'captions'
+                self.codec = 'auto'
+                self.format = old_subtitle_format
+            else:
+                self.download_type = 'video'
+                self.codec = old_video_codec
+                if old_quality == 'best_ios':
+                    self.format = 'ios'
+                    self.quality = 'best'
+                elif old_quality == 'audio':
+                    self.download_type = 'audio'
+                    self.codec = 'auto'
+                    self.format = 'm4a'
+                    self.quality = 'best'
+            self.__dict__.pop('video_codec', None)
+            self.__dict__.pop('subtitle_format', None)
+
+        if not getattr(self, "codec", None):
+            self.codec = "auto"
+        if not hasattr(self, "folder"):
+            self.folder = ""
+        if not hasattr(self, "custom_name_prefix"):
+            self.custom_name_prefix = ""
+        if not hasattr(self, "playlist_item_limit"):
+            self.playlist_item_limit = 0
+        if not hasattr(self, "split_by_chapters"):
+            self.split_by_chapters = False
+        if not hasattr(self, "chapter_template"):
+            self.chapter_template = ""
+        if not hasattr(self, "subtitle_language"):
+            self.subtitle_language = "en"
+        if not hasattr(self, "subtitle_mode"):
+            self.subtitle_mode = "prefer_manual"
+        if not hasattr(self, "entry"):
+            self.entry = None
+        if not hasattr(self, "subtitle_files"):
+            self.subtitle_files = []
+        if not hasattr(self, "chapter_files"):
+            self.chapter_files = []
+
+
+_PERSISTED_DOWNLOAD_FIELDS = (
+    "id",
+    "title",
+    "url",
+    "quality",
+    "download_type",
+    "codec",
+    "format",
+    "folder",
+    "custom_name_prefix",
+    "playlist_item_limit",
+    "split_by_chapters",
+    "chapter_template",
+    "subtitle_language",
+    "subtitle_mode",
+    "status",
+    "timestamp",
+    "error",
+    "msg",
+    "filename",
+    "size",
+    "chapter_files",
+)
+
+
+def _compact_persisted_entry(entry: Any) -> Optional[dict[str, Any]]:
+    if not isinstance(entry, dict):
+        return None
+    compact = {
+        key: value
+        for key, value in entry.items()
+        if key.startswith("playlist") or key.startswith("channel")
+    }
+    return compact or None
+
+
+def _download_info_to_record(
+    info: DownloadInfo,
+    *,
+    include_entry: bool,
+) -> dict[str, Any]:
+    record: dict[str, Any] = {}
+    for key in _PERSISTED_DOWNLOAD_FIELDS:
+        if hasattr(info, key):
+            value = getattr(info, key)
+            if value is not None:
+                record[key] = to_json_compatible(value)
+    if include_entry:
+        compact_entry = _compact_persisted_entry(getattr(info, "entry", None))
+        if compact_entry is not None:
+            record["entry"] = to_json_compatible(compact_entry)
+    return record
+
+
+def _download_info_from_record(record: dict[str, Any]) -> DownloadInfo:
+    info = DownloadInfo.__new__(DownloadInfo)
+    info.__setstate__({key: from_json_compatible(value) for key, value in record.items()})
+    if not hasattr(info, "msg"):
+        info.msg = None
+    if not hasattr(info, "percent"):
+        info.percent = None
+    if not hasattr(info, "speed"):
+        info.speed = None
+    if not hasattr(info, "eta"):
+        info.eta = None
+    if not hasattr(info, "status"):
+        info.status = "pending"
+    if not hasattr(info, "size"):
+        info.size = None
+    if not hasattr(info, "error"):
+        info.error = None
+    return info
+
 class Download:
     manager = None
 
+    @classmethod
+    def shutdown_manager(cls):
+        if cls.manager is not None:
+            cls.manager.shutdown()
+            cls.manager = None
+
     def __init__(self, download_dir, temp_dir, output_template, output_template_chapter, quality, format, ytdl_opts, info):
         self.download_dir = download_dir
         self.temp_dir = temp_dir
         self.output_template = output_template
         self.output_template_chapter = output_template_chapter
         self.info = info
-        self.format = get_format(format, quality)
+        self.format = get_format(
+            getattr(info, 'download_type', 'video'),
+            getattr(info, 'codec', 'auto'),
+            format,
+            quality,
+        )
         self.ytdl_opts = get_opts(
+            getattr(info, 'download_type', 'video'),
+            getattr(info, 'codec', 'auto'),
             format,
             quality,
             ytdl_opts,
-            subtitle_format=getattr(info, 'subtitle_format', 'srt'),
             subtitle_language=getattr(info, 'subtitle_language', 'en'),
             subtitle_mode=getattr(info, 'subtitle_mode', 'prefer_manual'),
         )
@@ -241,7 +412,7 @@ class Download:
                     # For captions-only downloads, yt-dlp may still report a media-like
                     # filepath in MoveFiles. Capture subtitle outputs explicitly so the
                     # UI can link to real caption files.
-                    if self.info.format == 'captions':
+                    if getattr(self.info, 'download_type', '') == 'captions':
                         requested_subtitles = d.get('info_dict', {}).get('requested_subtitles', {}) or {}
                         for subtitle in requested_subtitles.values():
                             if isinstance(subtitle, dict) and subtitle.get('filepath'):
@@ -349,14 +520,14 @@ class Download:
                 rel_name = os.path.relpath(fileName, self.download_dir)
                 # For captions mode, ignore media-like placeholders and let subtitle_file
                 # statuses define the final file shown in the UI.
-                if self.info.format == 'captions':
-                    requested_subtitle_format = str(getattr(self.info, 'subtitle_format', '')).lower()
+                if getattr(self.info, 'download_type', '') == 'captions':
+                    requested_subtitle_format = str(getattr(self.info, 'format', '')).lower()
                     allowed_caption_exts = ('.txt',) if requested_subtitle_format == 'txt' else ('.vtt', '.srt', '.sbv', '.scc', '.ttml', '.dfxp')
                     if not rel_name.lower().endswith(allowed_caption_exts):
                         continue
                 self.info.filename = rel_name
                 self.info.size = os.path.getsize(fileName) if os.path.exists(fileName) else None
-                if self.info.format == 'thumbnail':
+                if getattr(self.info, 'download_type', '') == 'thumbnail':
                     self.info.filename = re.sub(r'\.webm$', '.jpg', self.info.filename)
 
             # Handle chapter files
@@ -381,7 +552,7 @@ class Download:
                 subtitle_output_file = subtitle_file
 
                 # txt mode is derived from SRT by stripping cue metadata.
-                if self.info.format == 'captions' and str(getattr(self.info, 'subtitle_format', '')).lower() == 'txt':
+                if getattr(self.info, 'download_type', '') == 'captions' and str(getattr(self.info, 'format', '')).lower() == 'txt':
                     converted_txt = _convert_srt_to_txt_file(subtitle_file)
                     if converted_txt:
                         subtitle_output_file = converted_txt
@@ -397,9 +568,9 @@ class Download:
                 if not existing:
                     self.info.subtitle_files.append({'filename': rel_path, 'size': file_size})
                 # Prefer first subtitle file as the primary result link in captions mode.
-                if self.info.format == 'captions' and (
+                if getattr(self.info, 'download_type', '') == 'captions' and (
                     not getattr(self.info, 'filename', None) or
-                    str(getattr(self.info, 'subtitle_format', '')).lower() == 'txt'
+                    str(getattr(self.info, 'format', '')).lower() == 'txt'
                 ):
                     self.info.filename = rel_path
                     self.info.size = file_size
@@ -422,16 +593,14 @@ class PersistentQueue:
         pdir = os.path.dirname(path)
         if not os.path.isdir(pdir):
             os.mkdir(pdir)
-        with shelve.open(path, 'c'):
-            pass
-
-        self.path = path
-        self.repair()
+        self.legacy_path = path
+        self.path = f"{path}.json"
+        self.store = AtomicJsonStore(self.path, kind=f"persistent_queue:{name}")
         self.dict = OrderedDict()
 
     def load(self):
         for k, v in self.saved_items():
-            self.dict[k] = Download(None, None, None, None, None, None, {}, v)
+            self.dict[k] = Download(None, None, None, None, getattr(v, 'quality', 'best'), getattr(v, 'format', 'any'), {}, v)
 
     def exists(self, key):
         return key in self.dict
@@ -443,20 +612,91 @@ class PersistentQueue:
         return self.dict.items()
 
     def saved_items(self):
-        with shelve.open(self.path, 'r') as shelf:
-            return sorted(shelf.items(), key=lambda item: item[1].timestamp)
+        items = [
+            (item["key"], _download_info_from_record(item["info"]))
+            for item in self._load_state_items()
+        ]
+        return sorted(items, key=lambda item: item[1].timestamp)
+
+    def _should_persist_entry(self) -> bool:
+        return self.identifier != "completed"
+
+    def _serialize_items(self):
+        return [
+            {
+                "key": key,
+                "info": _download_info_to_record(
+                    download.info,
+                    include_entry=self._should_persist_entry(),
+                ),
+            }
+            for key, download in self.dict.items()
+        ]
+
+    def _save_dict(self):
+        self.store.save({"items": self._serialize_items()})
+
+    def _load_state_items(self):
+        payload = self.store.load()
+        if payload is not None:
+            items = payload.get("items")
+            if isinstance(items, list):
+                compact_items = [
+                    {
+                        "key": item["key"],
+                        "info": _download_info_to_record(
+                            _download_info_from_record(item["info"]),
+                            include_entry=self._should_persist_entry(),
+                        ),
+                    }
+                    for item in items
+                    if isinstance(item, dict) and "key" in item and "info" in item
+                ]
+                if payload.get("schema_version") != self.store.schema_version or compact_items != items:
+                    self.store.save({"items": compact_items})
+                return compact_items
+            log.warning("PersistentQueue:%s state file did not contain an items list", self.identifier)
+            return []
+
+        legacy_items = read_legacy_shelf(self.legacy_path)
+        if legacy_items is None:
+            return []
+
+        items = [
+            {
+                "key": key,
+                "info": _download_info_to_record(
+                    value,
+                    include_entry=self._should_persist_entry(),
+                ),
+            }
+            for key, value in sorted(legacy_items, key=lambda item: item[1].timestamp)
+        ]
+        self.store.save({"items": items})
+        return items
 
     def put(self, value):
         key = value.info.url
+        old = self.dict.get(key)
         self.dict[key] = value
-        with shelve.open(self.path, 'w') as shelf:
-            shelf[key] = value.info
+        try:
+            self._save_dict()
+        except Exception:
+            if old is None:
+                del self.dict[key]
+            else:
+                self.dict[key] = old
+            raise
 
     def delete(self, key):
         if key in self.dict:
+            old = self.dict[key]
             del self.dict[key]
-            with shelve.open(self.path, 'w') as shelf:
-                shelf.pop(key, None)
+            try:
+                self._save_dict()
+            except Exception:
+                self.dict[key] = old
+                raise
 
     def next(self):
         k, v = next(iter(self.dict.items()))
@@ -465,77 +705,6 @@ class PersistentQueue:
     def empty(self):
         return not bool(self.dict)
 
-    def repair(self):
-        # check DB format
-        type_check = subprocess.run(
-            ["file", self.path],
-            capture_output=True,
-            text=True
-        )
-        db_type = type_check.stdout.lower()
-
-        # create backup (<queue>.old)
-        try:
-            shutil.copy2(self.path, f"{self.path}.old")
-        except Exception as e:
-            # if we cannot backup then its not safe to attempt a repair
-            #  since it could be due to a filesystem error
-            log.debug(f"PersistentQueue:{self.identifier} backup failed, skipping repair")
-            return
-
-        if "gnu dbm" in db_type:
-            # perform gdbm repair
-            log_prefix = f"PersistentQueue:{self.identifier} repair (dbm/file)"
-            log.debug(f"{log_prefix} started")
-            try:
-                result = subprocess.run(
-                    ["gdbmtool", self.path],
-                    input="recover verbose summary\n",
-                    text=True,
-                    capture_output=True,
-                    timeout=60
-                )
-                log.debug(f"{log_prefix} {result.stdout}")
-                if result.stderr:
-                    log.debug(f"{log_prefix} failed: {result.stderr}")
-            except FileNotFoundError:
-                log.debug(f"{log_prefix} failed: 'gdbmtool' was not found")
-
-            # perform null key cleanup
-            log_prefix = f"PersistentQueue:{self.identifier} repair (null keys)"
-            log.debug(f"{log_prefix} started")
-            deleted = 0
-            try:
-                with dbm.open(self.path, "w") as db:
-                    for key in list(db.keys()):
-                        if len(key) > 0 and all(b == 0x00 for b in key):
-                            log.debug(f"{log_prefix} deleting key of length {len(key)} (all NUL bytes)")
-                            del db[key]
-                            deleted += 1
-                log.debug(f"{log_prefix} done - deleted {deleted} key(s)")
-            except dbm.error:
-                log.debug(f"{log_prefix} failed: db type is dbm.gnu, but the module is not available (dbm.error; module support may be missing or the file may be corrupted)")
-
-        elif "sqlite" in db_type:
-            # perform sqlite3 recovery
-            log_prefix = f"PersistentQueue:{self.identifier} repair (sqlite3/file)"
-            log.debug(f"{log_prefix} started")
-            try:
-                result = subprocess.run(
-                    f"sqlite3 {self.path} '.recover' | sqlite3 {self.path}.tmp",
-                    capture_output=True,
-                    text=True,
-                    shell=True,
-                    timeout=60
-                )
-                if result.stderr:
-                    log.debug(f"{log_prefix} failed: {result.stderr}")
-                else:
-                    shutil.move(f"{self.path}.tmp", self.path)
-                    log.debug(f"{log_prefix}{result.stdout or " was successful, no output"}")
-            except FileNotFoundError:
-                log.debug(f"{log_prefix} failed: 'sqlite3' was not found")
-
 class DownloadQueue:
     def __init__(self, config, notifier):
         self.config = config
@@ -582,7 +751,7 @@ class DownloadQueue:
             if download.tmpfilename and os.path.isfile(download.tmpfilename):
                 try:
                     os.remove(download.tmpfilename)
-                except:
+                except OSError:
                     pass
             download.info.status = 'error'
         download.close()
@@ -622,8 +791,8 @@ class DownloadQueue:
             **({'impersonate': yt_dlp.networking.impersonate.ImpersonateTarget.from_str(self.config.YTDL_OPTIONS['impersonate'])} if 'impersonate' in self.config.YTDL_OPTIONS else {}),
         }).extract_info(url, download=False)
 
-    def __calc_download_path(self, quality, format, folder):
-        base_directory = self.config.DOWNLOAD_DIR if (quality != 'audio' and format not in AUDIO_FORMATS) else self.config.AUDIO_DOWNLOAD_DIR
+    def __calc_download_path(self, download_type, folder):
+        base_directory = self.config.AUDIO_DOWNLOAD_DIR if download_type == 'audio' else self.config.DOWNLOAD_DIR
         if folder:
             if not self.config.CUSTOM_DIRS:
                 return None, {'status': 'error', 'msg': 'A folder for the download was specified but CUSTOM_DIRS is not true in the configuration.'}
@@ -640,7 +809,7 @@ class DownloadQueue:
         return dldirectory, None
 
     async def __add_download(self, dl, auto_start):
-        dldirectory, error_message = self.__calc_download_path(dl.quality, dl.format, dl.folder)
+        dldirectory, error_message = self.__calc_download_path(dl.download_type, dl.folder)
         if error_message is not None:
             return error_message
         output = self.config.OUTPUT_TEMPLATE if len(dl.custom_name_prefix) == 0 else f'{dl.custom_name_prefix}.{self.config.OUTPUT_TEMPLATE}'
@@ -674,15 +843,16 @@ class DownloadQueue:
     async def __add_entry(
         self,
         entry,
-        quality,
+        download_type,
+        codec,
         format,
+        quality,
         folder,
         custom_name_prefix,
         playlist_item_limit,
         auto_start,
         split_by_chapters,
         chapter_template,
-        subtitle_format,
         subtitle_language,
         subtitle_mode,
         already,
@@ -705,15 +875,16 @@ class DownloadQueue:
             log.debug('Processing as a url')
             return await self.add(
                 entry['url'],
-                quality,
+                download_type,
+                codec,
                 format,
+                quality,
                 folder,
                 custom_name_prefix,
                 playlist_item_limit,
                 auto_start,
                 split_by_chapters,
                 chapter_template,
-                subtitle_format,
                 subtitle_language,
                 subtitle_mode,
                 already,
@@ -744,15 +915,16 @@ class DownloadQueue:
                 results.append(
                     await self.__add_entry(
                         etr,
-                        quality,
+                        download_type,
+                        codec,
                         format,
+                        quality,
                         folder,
                         custom_name_prefix,
                         playlist_item_limit,
                         auto_start,
                         split_by_chapters,
                         chapter_template,
-                        subtitle_format,
                         subtitle_language,
                         subtitle_mode,
                         already,
@@ -770,21 +942,22 @@ class DownloadQueue:
                 return {'status': 'ok'}
             if not self.queue.exists(key):
                 dl = DownloadInfo(
-                    entry['id'],
-                    entry.get('title') or entry['id'],
-                    key,
-                    quality,
-                    format,
-                    folder,
-                    custom_name_prefix,
-                    error,
-                    entry,
-                    playlist_item_limit,
-                    split_by_chapters,
-                    chapter_template,
-                    subtitle_format,
-                    subtitle_language,
-                    subtitle_mode,
+                    id=entry['id'],
+                    title=entry.get('title') or entry['id'],
+                    url=key,
+                    quality=quality,
+                    download_type=download_type,
+                    codec=codec,
+                    format=format,
+                    folder=folder,
+                    custom_name_prefix=custom_name_prefix,
+                    error=error,
+                    entry=entry,
+                    playlist_item_limit=playlist_item_limit,
+                    split_by_chapters=split_by_chapters,
+                    chapter_template=chapter_template,
+                    subtitle_language=subtitle_language,
+                    subtitle_mode=subtitle_mode,
                 )
                 await self.__add_download(dl, auto_start)
             return {'status': 'ok'}
@@ -793,24 +966,25 @@ class DownloadQueue:
     async def add(
         self,
         url,
-        quality,
+        download_type,
+        codec,
         format,
+        quality,
         folder,
         custom_name_prefix,
         playlist_item_limit,
         auto_start=True,
         split_by_chapters=False,
         chapter_template=None,
-        subtitle_format="srt",
         subtitle_language="en",
         subtitle_mode="prefer_manual",
         already=None,
         _add_gen=None,
     ):
         log.info(
-            f'adding {url}: {quality=} {format=} {already=} {folder=} {custom_name_prefix=} '
+            f'adding {url}: {download_type=} {codec=} {format=} {quality=} {already=} {folder=} {custom_name_prefix=} '
             f'{playlist_item_limit=} {auto_start=} {split_by_chapters=} {chapter_template=} '
-            f'{subtitle_format=} {subtitle_language=} {subtitle_mode=}'
+            f'{subtitle_language=} {subtitle_mode=}'
         )
         if already is None:
             _add_gen = self._add_generation
@@ -827,25 +1001,62 @@ class DownloadQueue:
             return {'status': 'error', 'msg': str(exc)}
         return await self.__add_entry(
             entry,
-            quality,
+            download_type,
+            codec,
             format,
+            quality,
             folder,
             custom_name_prefix,
             playlist_item_limit,
             auto_start,
             split_by_chapters,
             chapter_template,
-            subtitle_format,
             subtitle_language,
             subtitle_mode,
             already,
             _add_gen,
         )
 
+    async def add_entry(
+        self,
+        entry,
+        download_type,
+        codec,
+        format,
+        quality,
+        folder,
+        custom_name_prefix,
+        playlist_item_limit,
+        auto_start=True,
+        split_by_chapters=False,
+        chapter_template=None,
+        subtitle_language="en",
+        subtitle_mode="prefer_manual",
+    ):
+        normalized_entry = copy.deepcopy(entry) if isinstance(entry, dict) else entry
+        already = set()
+        return await self.__add_entry(
+            normalized_entry,
+            download_type,
+            codec,
+            format,
+            quality,
+            folder,
+            custom_name_prefix,
+            playlist_item_limit,
+            auto_start,
+            split_by_chapters,
+            chapter_template,
+            subtitle_language,
+            subtitle_mode,
+            already,
+            None,
+        )
+
     async def start_pending(self, ids):
         for id in ids:
             if not self.pending.exists(id):
-                log.warn(f'requested start for non-existent download {id}')
+                log.warning(f'requested start for non-existent download {id}')
                 continue
             dl = self.pending.get(id)
             self.queue.put(dl)
@@ -862,7 +1073,7 @@ class DownloadQueue:
                 await self.notifier.canceled(id)
                 continue
             if not self.queue.exists(id):
-                log.warn(f'requested cancel for non-existent download {id}')
+                log.warning(f'requested cancel for non-existent download {id}')
                 continue
             if self.queue.get(id).started():
                 self.queue.get(id).cancel()
@@ -874,15 +1085,15 @@ class DownloadQueue:
     async def clear(self, ids):
         for id in ids:
             if not self.done.exists(id):
-                log.warn(f'requested delete for non-existent download {id}')
+                log.warning(f'requested delete for non-existent download {id}')
                 continue
             if self.config.DELETE_FILE_ON_TRASHCAN:
                 dl = self.done.get(id)
                 try:
-                    dldirectory, _ = self.__calc_download_path(dl.info.quality, dl.info.format, dl.info.folder)
+                    dldirectory, _ = self.__calc_download_path(dl.info.download_type, dl.info.folder)
                     os.remove(os.path.join(dldirectory, dl.info.filename))
                 except Exception as e:
-                    log.warn(f'deleting file for download {id} failed with error message {e!r}')
+                    log.warning(f'deleting file for download {id} failed with error message {e!r}')
             self.done.delete(id)
             await self.notifier.cleared(id)
         return {'status': 'ok'}

pyproject.toml

@@ -15,4 +15,13 @@ dependencies = [
 [dependency-groups]
 dev = [
     "pylint",
+    "pytest>=8.0",
+    "pytest-aiohttp>=1.0",
+    "pytest-asyncio>=0.24",
 ]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["app/tests"]
+pythonpath = [".", "app"]
+addopts = "-v"

ui/angular.json

@@ -33,9 +33,7 @@
               "node_modules/@ng-select/ng-select/themes/default.theme.css",
               "src/styles.sass"
             ],
-            "scripts": [
-              "node_modules/bootstrap/dist/js/bootstrap.bundle.min.js"
-            ],
+            "scripts": [],
             "serviceWorker": "ngsw-config.json",
             "browser": "src/main.ts",
             "polyfills": [
@@ -77,7 +75,8 @@
               "buildTarget": "metube:build:production"
             },
              "development": {
-              "buildTarget": "metube:build:development"
+              "buildTarget": "metube:build:development",
+              "proxyConfig": "proxy.conf.json"
             }
           },
            "defaultConfiguration": "development"

ui/package.json

@@ -23,24 +23,24 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/animations": "^21.2.1",
-    "@angular/common": "^21.2.1",
-    "@angular/compiler": "^21.2.1",
-    "@angular/core": "^21.2.1",
-    "@angular/forms": "^21.2.1",
-    "@angular/platform-browser": "^21.2.1",
-    "@angular/platform-browser-dynamic": "^21.2.1",
-    "@angular/service-worker": "^21.2.1",
+    "@angular/animations": "^21.2.6",
+    "@angular/common": "^21.2.6",
+    "@angular/compiler": "^21.2.6",
+    "@angular/core": "^21.2.6",
+    "@angular/forms": "^21.2.6",
+    "@angular/platform-browser": "^21.2.6",
+    "@angular/platform-browser-dynamic": "^21.2.6",
+    "@angular/service-worker": "^21.2.6",
     "@fortawesome/angular-fontawesome": "~4.0.0",
     "@fortawesome/fontawesome-svg-core": "^7.2.0",
     "@fortawesome/free-brands-svg-icons": "^7.2.0",
     "@fortawesome/free-regular-svg-icons": "^7.2.0",
     "@fortawesome/free-solid-svg-icons": "^7.2.0",
     "@ng-bootstrap/ng-bootstrap": "^20.0.0",
-    "@ng-select/ng-select": "^21.5.2",
+    "@ng-select/ng-select": "^21.7.0",
     "@popperjs/core": "^2.11.8",
     "bootstrap": "^5.3.8",
-    "ngx-cookie-service": "^21.1.0",
+    "ngx-cookie-service": "^21.3.1",
     "ngx-socket-io": "~4.10.0",
     "rxjs": "~7.8.2",
     "tslib": "^2.8.1",
@@ -48,16 +48,16 @@
   },
   "devDependencies": {
     "@angular-eslint/builder": "21.1.0",
-    "@angular/build": "^21.2.1",
-    "@angular/cli": "^21.2.1",
-    "@angular/compiler-cli": "^21.2.1",
-    "@angular/localize": "^21.2.1",
-    "@eslint/js": "^9.39.3",
+    "@angular/build": "^21.2.5",
+    "@angular/cli": "^21.2.5",
+    "@angular/compiler-cli": "^21.2.6",
+    "@angular/localize": "^21.2.6",
+    "@eslint/js": "^9.39.4",
     "angular-eslint": "21.1.0",
-    "eslint": "^9.39.3",
+    "eslint": "^9.39.4",
     "jsdom": "^27.4.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "8.47.0",
-    "vitest": "^4.0.18"
+    "vitest": "^4.1.2"
   }
 }

ui/src/app/app.config.ts

@@ -1,4 +1,4 @@
-import { ApplicationConfig, provideBrowserGlobalErrorListeners, isDevMode, provideZonelessChangeDetection, provideZoneChangeDetection } from '@angular/core';
+import { ApplicationConfig, provideBrowserGlobalErrorListeners, isDevMode, provideZoneChangeDetection } from '@angular/core';
 import { provideServiceWorker } from '@angular/service-worker';
 import { provideHttpClient, withInterceptorsFromDi } from '@angular/common/http';
 

ui/src/app/app.html

@@ -49,22 +49,22 @@
     </div>
     -->
     <div class="navbar-nav ms-auto">
-      <div class="nav-item dropdown">
+      <div class="nav-item dropdown" ngbDropdown placement="bottom-end">
         <button class="btn btn-link nav-link py-2 px-0 px-sm-2 dropdown-toggle d-flex align-items-center"
           id="theme-select"
           type="button"
           aria-expanded="false"
-          data-bs-toggle="dropdown"
-          data-bs-display="static">
+          ngbDropdownToggle>
           @if(activeTheme){
           <fa-icon [icon]="activeTheme.icon" />
           }
         </button>
-        <ul class="dropdown-menu dropdown-menu-end position-absolute" aria-labelledby="theme-select">
+        <ul class="dropdown-menu dropdown-menu-end position-absolute" aria-labelledby="theme-select" ngbDropdownMenu>
           @for (theme of themes; track theme) {
             <li>
               <button type="button" class="dropdown-item d-flex align-items-center"
               [class.active]="activeTheme === theme"
+              ngbDropdownItem
               (click)="themeChanged(theme)">
                 <span class="me-2 opacity-50">
                   <fa-icon [icon]="theme.icon" />
@@ -89,70 +89,278 @@
       <!-- Main URL Input with Download Button -->
       <div class="row mb-4">
         <div class="col">
-          <div class="input-group input-group-lg shadow-sm">
-            <input type="text"
-              autocomplete="off"
-              spellcheck="false"
-              class="form-control form-control-lg"
-              placeholder="Enter video, channel, or playlist URL"
-              name="addUrl"
-              [(ngModel)]="addUrl"
-              [disabled]="addInProgress || downloads.loading">
+          <ng-template #urlBarActions>
             @if (addInProgress && cancelRequested) {
               <button class="btn btn-warning btn-lg px-3" type="button" disabled>
                 <span class="spinner-border spinner-border-sm me-1" role="status"></span>
                 Canceling...
               </button>
             } @else if (addInProgress) {
-              <button class="btn btn-danger btn-lg px-3" type="button" (click)="cancelAdding()">
+              <button class="btn btn-secondary btn-lg px-3 add-progress-btn" type="button" disabled>
+                <span class="spinner-border spinner-border-sm me-2" role="status"></span>
+                Adding...
+              </button>
+              <button class="btn btn-outline-danger btn-lg px-3 add-cancel-btn"
+                type="button"
+                (click)="cancelAdding()"
+                aria-label="Cancel adding URL"
+                title="Cancel adding URL">
                 <fa-icon [icon]="faTimesCircle" class="me-1" /> Cancel
               </button>
+            } @else if (subscribeInProgress) {
+              <button class="btn btn-primary btn-lg px-4" type="button" disabled>
+                Download
+              </button>
+              <button class="btn btn-outline-secondary btn-lg px-3" type="button" disabled>
+                <span class="spinner-border spinner-border-sm me-2" role="status"></span>
+                Subscribing...
+              </button>
             } @else {
               <button class="btn btn-primary btn-lg px-4" type="submit"
                 (click)="addDownload()"
                 [disabled]="downloads.loading">
                 Download
               </button>
+              <button class="btn btn-outline-secondary btn-lg px-3" type="button"
+                (click)="addSubscription()"
+                [disabled]="downloads.loading">
+                Subscribe
+              </button>
             }
+          </ng-template>
+
+          <!-- Narrow viewports: full-width field, then Bootstrap btn-group (no faux input-group strip) -->
+          <div class="vstack gap-2 d-md-none">
+            <input type="text"
+              autocomplete="off"
+              spellcheck="false"
+              class="form-control form-control-lg"
+              placeholder="Enter video, channel, or playlist URL"
+              [(ngModel)]="addUrl"
+              [ngModelOptions]="{standalone: true}"
+              [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+            <div class="btn-group w-100" role="group" aria-label="Download or subscribe">
+              <ng-container [ngTemplateOutlet]="urlBarActions" />
+            </div>
+          </div>
+
+          <!-- md and up: standard input-group so Bootstrap handles fused borders -->
+          <div class="input-group input-group-lg shadow-sm d-none d-md-flex">
+            <input type="text"
+              autocomplete="off"
+              spellcheck="false"
+              class="form-control form-control-lg"
+              placeholder="Enter video, channel, or playlist URL"
+              [(ngModel)]="addUrl"
+              [ngModelOptions]="{standalone: true}"
+              [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+            <ng-container [ngTemplateOutlet]="urlBarActions" />
           </div>
         </div>
       </div>
 
       <!-- Options Row -->
       <div class="row mb-3 g-3">
-        <div class="col-md-4">
-          <div class="input-group">
-            <span class="input-group-text">Quality</span>
-            <select class="form-select"
-              name="quality"
-              [(ngModel)]="quality"
-              (change)="qualityChanged()"
-              [disabled]="addInProgress || downloads.loading">
-              @for (q of qualities; track q) {
-                <option [ngValue]="q.id">{{ q.text }}</option>
-              }
-            </select>
+        @if (downloadType === 'video') {
+          <div class="col-md-3">
+            <div class="input-group">
+              <span class="input-group-text">Type</span>
+              <select class="form-select"
+                name="downloadType"
+                [(ngModel)]="downloadType"
+                (change)="downloadTypeChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+                @for (type of downloadTypes; track type.id) {
+                  <option [ngValue]="type.id">{{ type.text }}</option>
+                }
+              </select>
+            </div>
           </div>
-        </div>
-        <div class="col-md-4">
-          <div class="input-group">
-            <span class="input-group-text">Format</span>
-            <select class="form-select"
-              name="format"
-              [(ngModel)]="format"
-              (change)="formatChanged()"
-              [disabled]="addInProgress || downloads.loading">
-              @for (f of formats; track f) {
-                <option [ngValue]="f.id">{{ f.text }}</option>
-              }
-            </select>
+          <div class="col-md-3">
+            <div class="input-group">
+              <span class="input-group-text">Codec</span>
+              <select class="form-select"
+                name="codec"
+                [(ngModel)]="codec"
+                (change)="codecChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+                @for (vc of videoCodecs; track vc.id) {
+                  <option [ngValue]="vc.id">{{ vc.text }}</option>
+                }
+              </select>
+            </div>
           </div>
-        </div>
-        <div class="col-md-4">
+          <div class="col-md-3">
+            <div class="input-group">
+              <span class="input-group-text">Format</span>
+              <select class="form-select"
+                name="format"
+                [(ngModel)]="format"
+                (change)="formatChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+                @for (f of formatOptions; track f.id) {
+                  <option [ngValue]="f.id">{{ f.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+          <div class="col-md-3">
+            <div class="input-group">
+              <span class="input-group-text">Quality</span>
+              <select class="form-select"
+                name="quality"
+                [(ngModel)]="quality"
+                (change)="qualityChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading || !showQualitySelector()">
+                @for (q of qualities; track q.id) {
+                  <option [ngValue]="q.id">{{ q.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+        } @else if (downloadType === 'audio') {
+          <div class="col-md-4">
+            <div class="input-group">
+              <span class="input-group-text">Type</span>
+              <select class="form-select"
+                name="downloadType"
+                [(ngModel)]="downloadType"
+                (change)="downloadTypeChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+                @for (type of downloadTypes; track type.id) {
+                  <option [ngValue]="type.id">{{ type.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+          <div class="col-md-4">
+            <div class="input-group">
+              <span class="input-group-text">Format</span>
+              <select class="form-select"
+                name="format"
+                [(ngModel)]="format"
+                (change)="formatChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+                @for (f of formatOptions; track f.id) {
+                  <option [ngValue]="f.id">{{ f.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+          <div class="col-md-4">
+            <div class="input-group">
+              <span class="input-group-text">Quality</span>
+              <select class="form-select"
+                name="quality"
+                [(ngModel)]="quality"
+                (change)="qualityChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+                @for (q of qualities; track q.id) {
+                  <option [ngValue]="q.id">{{ q.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+        } @else if (downloadType === 'captions') {
+          <!-- 4× col-md-3 is too tight at ~768px (long addons wrap the 4th field); 2×2 md–lg, one row lg+ -->
+          <div class="col-12 col-md-6 col-lg-3">
+            <div class="input-group">
+              <span class="input-group-text">Type</span>
+              <select class="form-select"
+                name="downloadType"
+                [(ngModel)]="downloadType"
+                (change)="downloadTypeChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+                @for (type of downloadTypes; track type.id) {
+                  <option [ngValue]="type.id">{{ type.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+          <div class="col-12 col-md-6 col-lg-3">
+            <div class="input-group">
+              <span class="input-group-text">Format</span>
+              <select class="form-select"
+                name="format"
+                [(ngModel)]="format"
+                (change)="formatChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                ngbTooltip="Subtitle output format for captions mode">
+                @for (f of formatOptions; track f.id) {
+                  <option [ngValue]="f.id">{{ f.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+          <div class="col-12 col-md-6 col-lg-3">
+            <div class="input-group">
+              <span class="input-group-text">Language</span>
+              <input class="form-control"
+                type="text"
+                list="subtitleLanguageOptions"
+                name="subtitleLanguage"
+                [(ngModel)]="subtitleLanguage"
+                (change)="subtitleLanguageChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                placeholder="e.g. en, es, zh-Hans"
+                ngbTooltip="Subtitle language (you can type any language code)">
+              <datalist id="subtitleLanguageOptions">
+                @for (lang of subtitleLanguages; track lang.id) {
+                  <option [value]="lang.id">{{ lang.text }}</option>
+                }
+              </datalist>
+            </div>
+          </div>
+          <div class="col-12 col-md-6 col-lg-3">
+            <div class="input-group">
+              <span class="input-group-text">Subtitle Source</span>
+              <select class="form-select"
+                name="subtitleMode"
+                [(ngModel)]="subtitleMode"
+                (change)="subtitleModeChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                ngbTooltip="Choose manual, auto, or fallback preference for captions mode">
+                @for (mode of subtitleModes; track mode.id) {
+                  <option [ngValue]="mode.id">{{ mode.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+        } @else {
+          <div class="col-md-6">
+            <div class="input-group">
+              <span class="input-group-text">Type</span>
+              <select class="form-select"
+                name="downloadType"
+                [(ngModel)]="downloadType"
+                (change)="downloadTypeChanged()"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+                @for (type of downloadTypes; track type.id) {
+                  <option [ngValue]="type.id">{{ type.text }}</option>
+                }
+              </select>
+            </div>
+          </div>
+          <div class="col-md-6">
+            <div class="input-group">
+              <span class="input-group-text">Format</span>
+              <input class="form-control" value="JPG" disabled>
+            </div>
+          </div>
+        }
+      </div>
+
+      <div class="row mb-3 g-3">
+        <div class="col-12 text-start">
           <button type="button"
-            class="btn btn-outline-secondary w-100 h-100"
-            (click)="toggleAdvanced()">
+            class="btn btn-link p-0 text-decoration-none"
+            (click)="toggleAdvanced()"
+            [attr.aria-expanded]="isAdvancedOpen"
+            aria-controls="advancedOptions">
             Advanced Options
+            <fa-icon
+              [icon]="isAdvancedOpen ? faChevronDown : faChevronRight"
+              class="ms-1" />
           </button>
         </div>
       </div>
@@ -161,7 +369,7 @@
       <div class="row">
         <div class="col-12">
           <div class="collapse show" id="advancedOptions" [ngbCollapse]="!isAdvancedOpen">
-            <div class="card card-body">
+            <div class="py-2">
               <!-- Advanced Settings -->
               <div class="row g-3 mb-2">
                 <div class="col-md-6">
@@ -171,7 +379,7 @@
                       name="autoStart"
                       [(ngModel)]="autoStart"
                       (change)="autoStartChanged()"
-                      [disabled]="addInProgress || downloads.loading"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                       ngbTooltip="Automatically start downloads when added">
                       <option [ngValue]="true">Yes</option>
                       <option [ngValue]="false">No</option>
@@ -188,7 +396,7 @@
                       addTagText="Create directory"
                       bindLabel="folder"
                       [(ngModel)]="folder"
-                      [disabled]="addInProgress || downloads.loading"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                       [virtualScroll]="true"
                       [clearable]="true"
                       [loading]="downloads.loading"
@@ -207,7 +415,7 @@
                       placeholder="Default"
                       name="customNamePrefix"
                       [(ngModel)]="customNamePrefix"
-                      [disabled]="addInProgress || downloads.loading"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                       ngbTooltip="Add a prefix to downloaded filenames">
                   </div>
                 </div>
@@ -221,71 +429,31 @@
                       name="playlistItemLimit"
                       (keydown)="isNumber($event)"
                       [(ngModel)]="playlistItemLimit"
-                      [disabled]="addInProgress || downloads.loading"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                       ngbTooltip="Maximum number of items to download from a playlist or channel (0 = no limit)">
                   </div>
                 </div>
-                @if (format === 'captions') {
-                  <div class="col-md-4">
-                    <div class="input-group">
-                      <span class="input-group-text">Subtitles</span>
-                      <select class="form-select"
-                        name="subtitleFormat"
-                        [(ngModel)]="subtitleFormat"
-                        (change)="subtitleFormatChanged()"
-                        [disabled]="addInProgress || downloads.loading"
-                        ngbTooltip="Subtitle output format for captions mode">
-                        @for (fmt of subtitleFormats; track fmt.id) {
-                          <option [ngValue]="fmt.id">{{ fmt.text }}</option>
-                        }
-                      </select>
-                    </div>
-                    @if (subtitleFormat === 'txt') {
-                      <div class="form-text">TXT is generated from SRT by stripping timestamps and cue numbers.</div>
-                    }
+                <div class="col-md-6">
+                  <div class="input-group">
+                    <span class="input-group-text">Subscription Check (min)</span>
+                    <input type="number"
+                      min="1"
+                      class="form-control"
+                      name="checkIntervalMinutes"
+                      (keydown)="isNumber($event)"
+                      [(ngModel)]="checkIntervalMinutes"
+                      (ngModelChange)="checkIntervalChanged()"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                      ngbTooltip="How often to poll subscriptions for new videos">
                   </div>
-                  <div class="col-md-4">
-                    <div class="input-group">
-                      <span class="input-group-text">Language</span>
-                      <input class="form-control"
-                        type="text"
-                        list="subtitleLanguageOptions"
-                        name="subtitleLanguage"
-                        [(ngModel)]="subtitleLanguage"
-                        (change)="subtitleLanguageChanged()"
-                        [disabled]="addInProgress || downloads.loading"
-                        placeholder="e.g. en, es, zh-Hans"
-                        ngbTooltip="Subtitle language (you can type any language code)">
-                      <datalist id="subtitleLanguageOptions">
-                        @for (lang of subtitleLanguages; track lang.id) {
-                          <option [value]="lang.id">{{ lang.text }}</option>
-                        }
-                      </datalist>
-                    </div>
-                  </div>
-                  <div class="col-md-4">
-                    <div class="input-group">
-                      <span class="input-group-text">Subtitle Source</span>
-                      <select class="form-select"
-                        name="subtitleMode"
-                        [(ngModel)]="subtitleMode"
-                        (change)="subtitleModeChanged()"
-                        [disabled]="addInProgress || downloads.loading"
-                        ngbTooltip="Choose manual, auto, or fallback preference for captions mode">
-                        @for (mode of subtitleModes; track mode.id) {
-                          <option [ngValue]="mode.id">{{ mode.text }}</option>
-                        }
-                      </select>
-                    </div>
-                  </div>
-                }
+                </div>
                 <div class="col-12">
                   <div class="row g-2 align-items-center">
                     <div class="col-auto">
                       <div class="form-check form-switch">
                         <input class="form-check-input" type="checkbox" role="switch" id="checkbox-split-chapters"
                           name="splitByChapters" [(ngModel)]="splitByChapters" (change)="splitByChaptersChanged()"
-                          [disabled]="addInProgress || downloads.loading"
+                          [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                           ngbTooltip="Split video into separate files by chapters">
                         <label class="form-check-label" for="checkbox-split-chapters">Split by chapters</label>
                       </div>
@@ -295,7 +463,7 @@
                       <div class="input-group">
                         <span class="input-group-text">Template</span>
                         <input type="text" class="form-control" name="chapterTemplate" [(ngModel)]="chapterTemplate"
-                          (change)="chapterTemplateChanged()" [disabled]="addInProgress || downloads.loading"
+                          (change)="chapterTemplateChanged()" [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                           ngbTooltip="Output template for chapter files">
                       </div>
                     </div>
@@ -386,16 +554,18 @@
 
   <!-- Batch Import Modal -->
   <div class="modal fade" tabindex="-1" role="dialog"
+  aria-modal="true"
+  aria-labelledby="batch-import-modal-title"
   [class.show]="batchImportModalOpen"
   [style.display]="batchImportModalOpen ? 'block' : 'none'">
     <div class="modal-dialog" role="document">
       <div class="modal-content">
         <div class="modal-header">
-          <h5 class="modal-title">Batch Import URLs</h5>
+          <h5 id="batch-import-modal-title" class="modal-title">Batch Import URLs</h5>
           <button type="button" class="btn-close" aria-label="Close" (click)="closeBatchImportModal()"></button>
         </div>
         <div class="modal-body">
-          <textarea [(ngModel)]="batchImportText" class="form-control" rows="6"
+          <textarea id="batch-import-textarea" [(ngModel)]="batchImportText" class="form-control" rows="6"
           placeholder="Paste one video URL per line"></textarea>
           <div class="mt-2">
             @if (batchImportStatus) {
@@ -434,7 +604,7 @@
       <thead>
         <tr>
           <th scope="col" style="width: 1rem;">
-            <app-master-checkbox #queueMasterCheckboxRef [id]="'queue'" [list]="downloads.queue" (changed)="queueSelectionChanged($event)" />
+            <app-select-all-checkbox #queueMasterCheckboxRef [id]="'queue'" [list]="downloads.queue" (changed)="queueSelectionChanged($event)" />
           </th>
           <th scope="col">Video</th>
           <th scope="col" style="width: 8rem;">Speed</th>
@@ -446,7 +616,7 @@
         @for (download of downloads.queue | keyvalue: asIsOrder; track download.value.id) {
           <tr [class.disabled]='download.value.deleting'>
             <td>
-              <app-slave-checkbox [id]="download.key" [master]="queueMasterCheckboxRef" [checkable]="download.value" />
+              <app-item-checkbox [id]="download.key" [master]="queueMasterCheckboxRef" [checkable]="download.value" />
             </td>
             <td title="{{ download.value.filename }}">
               <div class="d-flex flex-column flex-sm-row align-items-center row-gap-2 column-gap-3">
@@ -460,10 +630,10 @@
             <td>
               <div class="d-flex">
                 @if (download.value.status === 'pending') {
-                  <button type="button" class="btn btn-link" (click)="downloadItemByKey(download.key)"><fa-icon [icon]="faDownload" /></button>
+                  <button type="button" class="btn btn-link" [attr.aria-label]="'Start download for ' + download.value.title" (click)="downloadItemByKey(download.key)"><fa-icon [icon]="faDownload" /></button>
                 }
-                <button type="button" class="btn btn-link" (click)="delDownload('queue', download.key)"><fa-icon [icon]="faTrashAlt" /></button>
-                <a href="{{download.value.url}}" target="_blank" class="btn btn-link"><fa-icon [icon]="faExternalLinkAlt" /></a>
+                <button type="button" class="btn btn-link" [attr.aria-label]="'Remove ' + download.value.title + ' from queue'" (click)="delDownload('queue', download.key)"><fa-icon [icon]="faTrashAlt" /></button>
+                <a href="{{download.value.url}}" target="_blank" class="btn btn-link" [attr.aria-label]="'Open source URL for ' + download.value.title"><fa-icon [icon]="faExternalLinkAlt" /></a>
               </div>
             </td>
           </tr>
@@ -476,9 +646,9 @@
   <div class="px-2 py-3 border-bottom">
     <button type="button" class="btn btn-link text-decoration-none px-0 me-4" (click)="toggleSortOrder()" ngbTooltip="{{ sortAscending ? 'Oldest first' : 'Newest first' }}"><fa-icon [icon]="sortAscending ? faSortAmountUp : faSortAmountDown" />&nbsp; {{ sortAscending ? 'Oldest first' : 'Newest first' }}</button>
     <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled #doneDelSelected (click)="delSelectedDownloads('done')"><fa-icon [icon]="faTrashAlt" />&nbsp; Clear selected</button>
-    <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled #doneClearCompleted (click)="clearCompletedDownloads()"><fa-icon [icon]="faCheckCircle" />&nbsp; Clear completed</button>
-    <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled #doneClearFailed (click)="clearFailedDownloads()"><fa-icon [icon]="faTimesCircle" />&nbsp; Clear failed</button>
-    <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled #doneRetryFailed (click)="retryFailedDownloads()"><fa-icon [icon]="faRedoAlt" />&nbsp; Retry failed</button>
+    <button type="button" class="btn btn-link text-decoration-none px-0 me-4" [disabled]="!hasCompletedDone" (click)="clearCompletedDownloads()"><fa-icon [icon]="faCheckCircle" />&nbsp; Clear completed</button>
+    <button type="button" class="btn btn-link text-decoration-none px-0 me-4" [disabled]="!hasFailedDone" (click)="clearFailedDownloads()"><fa-icon [icon]="faTimesCircle" />&nbsp; Clear failed</button>
+    <button type="button" class="btn btn-link text-decoration-none px-0 me-4" [disabled]="!hasFailedDone" (click)="retryFailedDownloads()"><fa-icon [icon]="faRedoAlt" />&nbsp; Retry failed</button>
     <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled #doneDownloadSelected (click)="downloadSelectedFiles()"><fa-icon [icon]="faDownload" />&nbsp; Download Selected</button>
   </div>
   <div class="overflow-auto">
@@ -486,10 +656,14 @@
       <thead>
         <tr>
           <th scope="col" style="width: 1rem;">
-            <app-master-checkbox #doneMasterCheckboxRef [id]="'done'" [list]="downloads.done" (changed)="doneSelectionChanged($event)" />
+            <app-select-all-checkbox #doneMasterCheckboxRef [id]="'done'" [list]="downloads.done" (changed)="doneSelectionChanged($event)" />
           </th>
           <th scope="col">Video</th>
+          <th scope="col">Type</th>
+          <th scope="col">Quality</th>
+          <th scope="col">Codec / Format</th>
           <th scope="col">File Size</th>
+          <th scope="col">Downloaded</th>
           <th scope="col" style="width: 8rem;"></th>
         </tr>
       </thead>
@@ -497,7 +671,7 @@
         @for (entry of cachedSortedDone; track entry[1].id) {
           <tr [class.disabled]='entry[1].deleting'>
             <td>
-              <app-slave-checkbox [id]="entry[0]" [master]="doneMasterCheckboxRef" [checkable]="entry[1]" />
+              <app-item-checkbox [id]="entry[0]" [master]="doneMasterCheckboxRef" [checkable]="entry[1]" />
             </td>
             <td>
               <div style="display: inline-block; width: 1.5rem;">
@@ -516,15 +690,18 @@
               <span ngbTooltip="{{buildResultItemTooltip(entry[1])}}">@if (!!entry[1].filename) {
                 <a href="{{buildDownloadLink(entry[1])}}" target="_blank">{{ entry[1].title }}</a>
               } @else {
-                <span [style.cursor]="entry[1].status === 'error' ? 'pointer' : 'default'"
-                  (click)="entry[1].status === 'error' ? toggleErrorDetail(entry[0]) : null">
-                  {{entry[1].title}}
-                  @if (entry[1].status === 'error' && !isErrorExpanded(entry[0])) {
-                    <small class="text-danger ms-2">
-                      <fa-icon [icon]="faChevronRight" size="xs" class="me-1" />Click for details
-                    </small>
-                  }
-                </span>
+                @if (entry[1].status === 'error') {
+                  <button type="button" class="btn btn-link p-0 text-start align-baseline" (click)="toggleErrorDetail(entry[0])">
+                    {{entry[1].title}}
+                    @if (!isErrorExpanded(entry[0])) {
+                      <small class="text-danger ms-2">
+                        <fa-icon [icon]="faChevronRight" size="xs" class="me-1" />Click for details
+                      </small>
+                    }
+                  </button>
+                } @else {
+                  <span>{{entry[1].title}}</span>
+                }
               }</span>
               @if (entry[1].status === 'error' && isErrorExpanded(entry[0])) {
                 <div class="alert alert-danger py-2 px-3 mt-2 mb-0 small" style="border-left: 4px solid var(--bs-danger);">
@@ -551,21 +728,35 @@
                 </div>
               }
             </td>
+            <td class="text-nowrap">
+              {{ downloadTypeLabel(entry[1]) }}
+            </td>
+            <td class="text-nowrap">
+              {{ formatQualityLabel(entry[1]) }}
+            </td>
+            <td class="text-nowrap">
+              {{ formatCodecLabel(entry[1]) }}
+            </td>
             <td>
               @if (entry[1].size) {
                 <span>{{ entry[1].size | fileSize }}</span>
               }
             </td>
+            <td class="text-nowrap">
+              @if (entry[1].timestamp) {
+                <span>{{ entry[1].timestamp / 1000000 | date:'yyyy-MM-dd HH:mm' }}</span>
+              }
+            </td>
             <td>
               <div class="d-flex">
                 @if (entry[1].status === 'error') {
-                  <button type="button" class="btn btn-link" (click)="retryDownload(entry[0], entry[1])"><fa-icon [icon]="faRedoAlt" /></button>
+                  <button type="button" class="btn btn-link" [attr.aria-label]="'Retry download for ' + entry[1].title" (click)="retryDownload(entry[0], entry[1])"><fa-icon [icon]="faRedoAlt" /></button>
                 }
                 @if (entry[1].filename) {
-                  <a href="{{buildDownloadLink(entry[1])}}" download class="btn btn-link"><fa-icon [icon]="faDownload" /></a>
+                  <a href="{{buildDownloadLink(entry[1])}}" download class="btn btn-link" [attr.aria-label]="'Download result file for ' + entry[1].title"><fa-icon [icon]="faDownload" /></a>
                 }
-                <a href="{{entry[1].url}}" target="_blank" class="btn btn-link"><fa-icon [icon]="faExternalLinkAlt" /></a>
-                <button type="button" class="btn btn-link" (click)="delDownload('done', entry[0])"><fa-icon [icon]="faTrashAlt" /></button>
+                <a href="{{entry[1].url}}" target="_blank" class="btn btn-link" [attr.aria-label]="'Open source URL for ' + entry[1].title"><fa-icon [icon]="faExternalLinkAlt" /></a>
+                <button type="button" class="btn btn-link" [attr.aria-label]="'Delete completed item ' + entry[1].title" (click)="delDownload('done', entry[0])"><fa-icon [icon]="faTrashAlt" /></button>
               </div>
             </td>
           </tr>
@@ -576,18 +767,22 @@
               <td>
                 <div style="padding-left: 2rem;">
               <fa-icon [icon]="faCheckCircle" class="text-success me-2" />
-              <a href="{{buildChapterDownloadLink(entry[1], chapterFile.filename)}}" target="_blank">{{
+              <a href="{{buildChapterDownloadLink(entry[1], chapterFile.filename)}}" target="_blank" [attr.aria-label]="'Open chapter file ' + getChapterFileName(chapterFile.filename)">{{
                 getChapterFileName(chapterFile.filename) }}</a>
             </div>
           </td>
+          <td></td>
+          <td></td>
+          <td></td>
           <td>
             @if (chapterFile.size) {
             <span>{{ chapterFile.size | fileSize }}</span>
             }
           </td>
+          <td></td>
           <td>
             <div class="d-flex">
-              <a href="{{buildChapterDownloadLink(entry[1], chapterFile.filename)}}" download
+              <a href="{{buildChapterDownloadLink(entry[1], chapterFile.filename)}}" download [attr.aria-label]="'Download chapter file ' + getChapterFileName(chapterFile.filename)"
                 class="btn btn-link"><fa-icon [icon]="faDownload" /></a>
             </div>
           </td>
@@ -598,6 +793,127 @@
       </tbody>
     </table>
   </div>
+
+  <div class="metube-section-header">Subscriptions</div>
+  <div class="px-2 py-3 border-bottom">
+    @if (checkingAllSubscriptions) {
+      <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled>
+        <span class="spinner-border spinner-border-sm me-2" role="status" aria-hidden="true"></span>Check all now
+      </button>
+    } @else {
+      <button type="button" class="btn btn-link text-decoration-none px-0 me-4"
+        (click)="checkAllSubscriptions()"
+        [disabled]="downloads.loading || cachedSubs.length === 0 || checkingSelectedSubscriptions">
+        <fa-icon [icon]="faRedoAlt" />&nbsp; Check all now
+      </button>
+    }
+    @if (checkingSelectedSubscriptions) {
+      <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled>
+        <span class="spinner-border spinner-border-sm me-2" role="status" aria-hidden="true"></span>Check selected
+      </button>
+    } @else {
+      <button type="button" class="btn btn-link text-decoration-none px-0 me-4"
+        (click)="checkSelectedSubscriptions()"
+        [disabled]="downloads.loading || selectedSubscriptionIds.size === 0 || checkingAllSubscriptions">
+        <fa-icon [icon]="faRedoAlt" />&nbsp; Check selected
+      </button>
+    }
+    <button type="button" class="btn btn-link text-decoration-none px-0 me-4"
+      (click)="deleteSelectedSubscriptions()"
+      [disabled]="downloads.loading || selectedSubscriptionIds.size === 0">
+      <fa-icon [icon]="faTrashAlt" />&nbsp; Delete selected
+    </button>
+  </div>
+  <div class="overflow-auto">
+    <table class="table">
+      <thead>
+        <tr>
+          <th scope="col" style="width: 1rem;">
+            <input type="checkbox" class="form-check-input"
+              [checked]="allSubsSelected()"
+              (change)="toggleSubMaster($event)"
+              [disabled]="downloads.loading || cachedSubs.length === 0"
+              aria-label="Select all subscriptions" />
+          </th>
+          <th scope="col">Name</th>
+          <th scope="col">URL</th>
+          <th scope="col" class="text-nowrap">Interval (min)</th>
+          <th scope="col" class="text-nowrap">Last checked</th>
+          <th scope="col">Status</th>
+          <th scope="col" style="width: 8rem;"></th>
+        </tr>
+      </thead>
+      <tbody>
+        @for (entry of cachedSubs; track entry[0]) {
+          <tr>
+            <td>
+              <input type="checkbox" class="form-check-input"
+                [checked]="isSubSelected(entry[0])"
+                (change)="toggleSubSelected(entry[0])"
+                [disabled]="downloads.loading"
+                [attr.aria-label]="'Select subscription ' + entry[1].name" />
+            </td>
+            <td>{{ entry[1].name }}</td>
+            <td class="text-break"><a [href]="entry[1].url" target="_blank" rel="noopener">{{ entry[1].url }}</a></td>
+            <td>{{ entry[1].check_interval_minutes }}</td>
+            <td class="text-nowrap">
+              @if (entry[1].last_checked !== null) {
+                <span>{{ entry[1].last_checked! * 1000 | date:'yyyy-MM-dd HH:mm:ss' }}</span>
+              } @else {
+                <span class="text-muted">—</span>
+              }
+            </td>
+            <td>
+              @if (entry[1].error) {
+                <span class="text-danger small">{{ entry[1].error }}</span>
+              } @else if (entry[1].enabled) {
+                <span class="text-success">Active</span>
+              } @else {
+                <span class="text-secondary">Paused</span>
+              }
+            </td>
+            <td>
+              <div class="d-flex flex-wrap gap-1">
+                @if (isSubscriptionChecking(entry[0])) {
+                  <button type="button" class="btn btn-link btn-sm p-0 me-2"
+                    disabled
+                    [attr.aria-label]="'Checking ' + entry[1].name"
+                    ngbTooltip="Checking now">
+                    <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
+                  </button>
+                } @else {
+                  <button type="button" class="btn btn-link btn-sm p-0 me-2"
+                    (click)="checkSubscriptionNow(entry[0])"
+                    [disabled]="downloads.loading"
+                    [attr.aria-label]="'Check now ' + entry[1].name"
+                    ngbTooltip="Check now">
+                    <fa-icon [icon]="faRedoAlt" />
+                  </button>
+                }
+                <button type="button" class="btn btn-link btn-sm p-0 me-2"
+                  (click)="toggleSubscriptionEnabled(entry[1])"
+                  [disabled]="downloads.loading"
+                  [attr.aria-label]="(entry[1].enabled ? 'Pause ' : 'Resume ') + entry[1].name"
+                  [ngbTooltip]="entry[1].enabled ? 'Pause' : 'Resume'">
+                  @if (entry[1].enabled) {
+                    <fa-icon [icon]="faPause" />
+                  } @else {
+                    <fa-icon [icon]="faPlay" />
+                  }
+                </button>
+                <button type="button" class="btn btn-link btn-sm p-0 text-danger"
+                  (click)="deleteSubscription(entry[0])"
+                  [disabled]="downloads.loading"
+                  [attr.aria-label]="'Delete subscription ' + entry[1].name">
+                  <fa-icon [icon]="faTrashAlt" />
+                </button>
+              </div>
+            </td>
+          </tr>
+        }
+      </tbody>
+    </table>
+  </div>
 </main><!-- /.container -->
 
 <footer class="footer navbar-dark bg-dark py-3 mt-5">

ui/src/app/app.sass

@@ -1,29 +1,7 @@
-.button-toggle-theme:focus, .button-toggle-theme:active
-    box-shadow: none
-    outline: 0px
-
 .add-url-box
     max-width: 960px
     margin: 4rem auto
 
-.add-url-component
-    margin: 0.5rem auto
-
-.add-url-group
-    width: 100%
-
-button.add-url
-    width: 100%
-
-.folder-dropdown-menu
-    width: 500px
-    max-width: calc(100vw - 3rem)
-
-.folder-dropdown-menu .input-group
-    display: flex
-    padding-left: 5px
-    padding-right: 5px
-
 .metube-section-header
     font-size: 1.8rem
     font-weight: 300
@@ -66,39 +44,11 @@ td
     width: 12rem
     margin-left: auto
 
-.batch-panel
-  margin-top: 15px
-  border: 1px solid #ccc
-  border-radius: 8px
-  padding: 15px
-  background-color: #fff
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1)
-
-.batch-panel-header
-  border-bottom: 1px solid #eee
-  padding-bottom: 8px
-  margin-bottom: 15px
-  h4
-    font-size: 1.5rem
-    margin: 0
-
-.batch-panel-body
-  textarea.form-control
-    resize: vertical
-
-.batch-status
-  font-size: 0.9rem
-  color: #555
-
-.d-flex.my-3
-  margin-top: 1rem
-  margin-bottom: 1rem
-
 .modal.fade.show
   background-color: rgba(0, 0, 0, 0.5)
 
 .modal-header
-  border-bottom: 1px solid #eee
+  border-bottom: 1px solid var(--bs-border-color)
 
 .modal-body
   textarea.form-control
@@ -112,20 +62,12 @@ td
   .spinner-border
     margin-right: 0.5rem
 
-::ng-deep .ng-select
-    flex: 1
-    .ng-select-container
-        min-height: 38px
-    .ng-value
-        white-space: nowrap
-        overflow: visible
-    .ng-dropdown-panel
-        .ng-dropdown-panel-items
-            max-height: 300px
-            .ng-option
-                white-space: nowrap
-                overflow: visible
-                text-overflow: ellipsis
+.add-progress-btn
+  min-width: 9.5rem
+  cursor: default
+
+.add-cancel-btn
+  min-width: 3.25rem
 
 :host
   display: flex

ui/src/app/app.spec.ts

@@ -1,24 +1,20 @@
 import { TestBed } from '@angular/core/testing';
 import { App } from './app';
 
-vi.hoisted(() => {
-  Object.defineProperty(window, "matchMedia", {
-    writable: true,
-    enumerable: true,
-    value: vi.fn().mockImplementation((query) => ({
-      matches: false,
-      media: query,
-      onchange: null,
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-      dispatchEvent: vi.fn(),
- })),
- });
-});
-
-
 describe('App', () => {
   beforeEach(async () => {
+    Object.defineProperty(window, 'matchMedia', {
+      writable: true,
+      enumerable: true,
+      value: vi.fn().mockImplementation((query: string) => ({
+        matches: false,
+        media: query,
+        onchange: null,
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        dispatchEvent: vi.fn(),
+      })),
+    });
     await TestBed.configureTestingModule({
       imports: [App],
     }).compileComponents();
@@ -29,5 +25,4 @@ describe('App', () => {
     const app = fixture.componentInstance;
     expect(app).toBeTruthy();
   });
-
 });

ui/src/app/components/index.ts

@@ -1,2 +1,2 @@
-export { MasterCheckboxComponent } from './master-checkbox.component';
-export { SlaveCheckboxComponent } from './slave-checkbox.component';
+export { SelectAllCheckboxComponent } from './master-checkbox.component';
+export { ItemCheckboxComponent } from './slave-checkbox.component';

ui/src/app/components/master-checkbox.component.spec.ts

@@ -0,0 +1,23 @@
+import { TestBed } from '@angular/core/testing';
+import { SelectAllCheckboxComponent } from './master-checkbox.component';
+import { Checkable } from '../interfaces';
+
+describe('SelectAllCheckboxComponent', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [SelectAllCheckboxComponent],
+    }).compileComponents();
+  });
+
+  it('clicked sets checked on all list items', () => {
+    const fixture = TestBed.createComponent(SelectAllCheckboxComponent);
+    const list = new Map<string, Checkable>();
+    list.set('u1', { checked: false });
+    fixture.componentRef.setInput('id', 'queue');
+    fixture.componentRef.setInput('list', list);
+    fixture.componentInstance.selected = true;
+    fixture.detectChanges();
+    fixture.componentInstance.clicked();
+    expect(list.get('u1')?.checked).toBe(true);
+  });
+});

ui/src/app/components/master-checkbox.component.ts

@@ -3,18 +3,18 @@ import { Checkable } from "../interfaces";
 import { FormsModule } from "@angular/forms";
 
 @Component({
-    selector: 'app-master-checkbox',
+    selector: 'app-select-all-checkbox',
     template: `
   <div class="form-check">
-    <input type="checkbox" class="form-check-input" id="{{id()}}-select-all" #masterCheckbox [(ngModel)]="selected" (change)="clicked()">
-    <label class="form-check-label" for="{{id()}}-select-all"></label>
+    <input type="checkbox" class="form-check-input" id="{{id()}}-select-all" #masterCheckbox [(ngModel)]="selected" (change)="clicked()" [attr.aria-label]="'Select all ' + id() + ' items'">
+    <label class="form-check-label visually-hidden" for="{{id()}}-select-all">Select all</label>
   </div>
 `,
 imports: [
   FormsModule
 ]
 })
-export class MasterCheckboxComponent {
+export class SelectAllCheckboxComponent {
   readonly id = input.required<string>();
   readonly list = input.required<Map<string, Checkable>>();
   readonly changed = output<number>();
@@ -33,7 +33,7 @@ export class MasterCheckboxComponent {
       return;
     let checked = 0;
     this.list().forEach(item => { if(item.checked) checked++ });
-    this.selected = checked > 0 && checked == this.list().size;
+    this.selected = checked > 0 && checked === this.list().size;
     masterCheckbox.nativeElement.indeterminate = checked > 0 && checked < this.list().size;
     this.changed.emit(checked);
   }

ui/src/app/components/slave-checkbox.component.spec.ts

@@ -0,0 +1,25 @@
+import { TestBed } from '@angular/core/testing';
+import { SelectAllCheckboxComponent } from './master-checkbox.component';
+import { ItemCheckboxComponent } from './slave-checkbox.component';
+
+describe('ItemCheckboxComponent', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [ItemCheckboxComponent, SelectAllCheckboxComponent],
+    }).compileComponents();
+  });
+
+  it('creates with master and checkable inputs', () => {
+    const masterFixture = TestBed.createComponent(SelectAllCheckboxComponent);
+    masterFixture.componentRef.setInput('id', 'q');
+    masterFixture.componentRef.setInput('list', new Map());
+    masterFixture.detectChanges();
+
+    const itemFixture = TestBed.createComponent(ItemCheckboxComponent);
+    itemFixture.componentRef.setInput('id', 'row1');
+    itemFixture.componentRef.setInput('master', masterFixture.componentInstance);
+    itemFixture.componentRef.setInput('checkable', { checked: false });
+    itemFixture.detectChanges();
+    expect(itemFixture.componentInstance).toBeTruthy();
+  });
+});

ui/src/app/components/slave-checkbox.component.ts

@@ -1,22 +1,22 @@
 import { Component, input } from '@angular/core';
-import { MasterCheckboxComponent } from './master-checkbox.component';
+import { SelectAllCheckboxComponent } from './master-checkbox.component';
 import { Checkable } from '../interfaces';
 import { FormsModule } from '@angular/forms';
 
 @Component({
-    selector: 'app-slave-checkbox',
+    selector: 'app-item-checkbox',
     template: `
   <div class="form-check">
-    <input type="checkbox" class="form-check-input" id="{{master().id()}}-{{id()}}-select" [(ngModel)]="checkable().checked" (change)="master().selectionChanged()">
-    <label class="form-check-label" for="{{master().id()}}-{{id()}}-select"></label>
+    <input type="checkbox" class="form-check-input" id="{{master().id()}}-{{id()}}-select" [(ngModel)]="checkable().checked" (change)="master().selectionChanged()" [attr.aria-label]="'Select item ' + id()">
+    <label class="form-check-label visually-hidden" for="{{master().id()}}-{{id()}}-select">Select item</label>
   </div>
 `,
 imports: [  
   FormsModule
 ]
 })
-export class SlaveCheckboxComponent {
+export class ItemCheckboxComponent {
   readonly id = input.required<string>();
-  readonly master = input.required<MasterCheckboxComponent>();
+  readonly master = input.required<SelectAllCheckboxComponent>();
   readonly checkable = input.required<Checkable>();
 }

ui/src/app/interfaces/download.ts

@@ -3,6 +3,8 @@ export interface Download {
   id: string;
   title: string;
   url: string;
+  download_type: string;
+  codec?: string;
   quality: string;
   format: string;
   folder: string;
@@ -10,7 +12,6 @@ export interface Download {
   playlist_item_limit: number;
   split_by_chapters?: boolean;
   chapter_template?: string;
-  subtitle_format?: string;
   subtitle_language?: string;
   subtitle_mode?: string;
   status: string;
@@ -20,8 +21,9 @@ export interface Download {
   eta: number;
   filename: string;
   checked: boolean;
+  timestamp?: number;
   size?: number;
   error?: string;
   deleting?: boolean;
-  chapter_files?: Array<{ filename: string, size: number }>;
+  chapter_files?: { filename: string, size: number }[];
 }

ui/src/app/interfaces/formats.ts

@@ -1,81 +1,77 @@
-import { Format } from "./format";
+import { Quality } from "./quality";
 
+export interface Option {
+  id: string;
+  text: string;
+}
 
-export const Formats: Format[] = [
-  {
-    id: 'any',
-    text: 'Any',
-    qualities: [
-      { id: 'best', text: 'Best' },
-      { id: '2160', text: '2160p' },
-      { id: '1440', text: '1440p' },
-      { id: '1080', text: '1080p' },
-      { id: '720', text: '720p' },
-      { id: '480', text: '480p' },
-      { id: '360', text: '360p' },
-      { id: '240', text: '240p' },
-      { id: 'worst', text: 'Worst' },
-      { id: 'audio', text: 'Audio Only' },
-    ],
-  },
-  {
-    id: 'mp4',
-    text: 'MP4',
-    qualities: [
-      { id: 'best', text: 'Best' },
-      { id: 'best_ios', text: 'Best (iOS)' },
-      { id: '2160', text: '2160p' },
-      { id: '1440', text: '1440p' },
-      { id: '1080', text: '1080p' },
-      { id: '720', text: '720p' },
-      { id: '480', text: '480p' },
-      { id: '360', text: '360p' },
-      { id: '240', text: '240p' },
-      { id: 'worst', text: 'Worst' },
-    ],
-  },
-  {
-    id: 'm4a',
-    text: 'M4A',
-    qualities: [
-      { id: 'best', text: 'Best' },
-      { id: '192', text: '192 kbps' },
-      { id: '128', text: '128 kbps' },
-    ],
-  },
-  {
-    id: 'mp3',
-    text: 'MP3',
-    qualities: [
-      { id: 'best', text: 'Best' },
-      { id: '320', text: '320 kbps' },
-      { id: '192', text: '192 kbps' },
-      { id: '128', text: '128 kbps' },
-    ],
-  },
-  {
-    id: 'opus',
-    text: 'OPUS',
-    qualities: [{ id: 'best', text: 'Best' }],
-  },
-  {
-    id: 'wav',
-    text: 'WAV',
-    qualities: [{ id: 'best', text: 'Best' }],
-  },
-  {
-    id: 'flac',
-    text: 'FLAC',
-    qualities: [{ id: 'best', text: 'Best' }],
-  },
-  {
-    id: 'thumbnail',
-    text: 'Thumbnail',
-    qualities: [{ id: 'best', text: 'Best' }],
-  },
-  {
-    id: 'captions',
-    text: 'Captions',
-    qualities: [{ id: 'best', text: 'Best' }],
-  },
+export interface AudioFormatOption extends Option {
+  qualities: Quality[];
+}
+
+export const DOWNLOAD_TYPES: Option[] = [
+  { id: "video", text: "Video" },
+  { id: "audio", text: "Audio" },
+  { id: "captions", text: "Captions" },
+  { id: "thumbnail", text: "Thumbnail" },
 ];
+
+export const VIDEO_CODECS: Option[] = [
+  { id: "auto", text: "Auto" },
+  { id: "h264", text: "H.264" },
+  { id: "h265", text: "H.265 (HEVC)" },
+  { id: "av1", text: "AV1" },
+  { id: "vp9", text: "VP9" },
+];
+
+export const VIDEO_FORMATS: Option[] = [
+  { id: "any", text: "Auto" },
+  { id: "mp4", text: "MP4" },
+  { id: "ios", text: "iOS Compatible" },
+];
+
+export const VIDEO_QUALITIES: Quality[] = [
+  { id: "best", text: "Best" },
+  { id: "2160", text: "2160p" },
+  { id: "1440", text: "1440p" },
+  { id: "1080", text: "1080p" },
+  { id: "720", text: "720p" },
+  { id: "480", text: "480p" },
+  { id: "360", text: "360p" },
+  { id: "240", text: "240p" },
+  { id: "worst", text: "Worst" },
+];
+
+export const AUDIO_FORMATS: AudioFormatOption[] = [
+  {
+    id: "m4a",
+    text: "M4A",
+    qualities: [
+      { id: "best", text: "Best" },
+      { id: "192", text: "192 kbps" },
+      { id: "128", text: "128 kbps" },
+    ],
+  },
+  {
+    id: "mp3",
+    text: "MP3",
+    qualities: [
+      { id: "best", text: "Best" },
+      { id: "320", text: "320 kbps" },
+      { id: "192", text: "192 kbps" },
+      { id: "128", text: "128 kbps" },
+    ],
+  },
+  { id: "opus", text: "OPUS", qualities: [{ id: "best", text: "Best" }] },
+  { id: "wav", text: "WAV", qualities: [{ id: "best", text: "Best" }] },
+  { id: "flac", text: "FLAC", qualities: [{ id: "best", text: "Best" }] },
+];
+
+export const CAPTION_FORMATS: Option[] = [
+  { id: "srt", text: "SRT" },
+  { id: "txt", text: "TXT (Text only)" },
+  { id: "vtt", text: "VTT" },
+  { id: "ttml", text: "TTML" },
+];
+
+export const THUMBNAIL_FORMATS: Option[] = [{ id: "jpg", text: "JPG" }];

ui/src/app/interfaces/index.ts

@@ -6,4 +6,4 @@ export * from './download';
 export * from './checkable';
 export * from './format';
 export * from './formats';
-
+export * from './subscription';

ui/src/app/interfaces/subscription.ts

@@ -0,0 +1,15 @@
+export interface SubscriptionRow {
+  id: string;
+  name: string;
+  url: string;
+  enabled: boolean;
+  check_interval_minutes: number;
+  download_type: string;
+  codec: string;
+  format: string;
+  quality: string;
+  folder: string;
+  last_checked: number | null;
+  seen_count: number;
+  error: string | null;
+}

ui/src/app/pipes/eta.pipe.spec.ts

@@ -0,0 +1,26 @@
+import { EtaPipe } from './eta.pipe';
+
+describe('EtaPipe', () => {
+  it('returns null for null input', () => {
+    const pipe = new EtaPipe();
+    expect(pipe.transform(null as unknown as number)).toBeNull();
+  });
+
+  it('formats seconds under one minute', () => {
+    const pipe = new EtaPipe();
+    expect(pipe.transform(0)).toBe('0s');
+    expect(pipe.transform(59)).toBe('59s');
+  });
+
+  it('formats minutes and seconds', () => {
+    const pipe = new EtaPipe();
+    expect(pipe.transform(60)).toBe('1m 0s');
+    expect(pipe.transform(90)).toBe('1m 30s');
+  });
+
+  it('formats hours', () => {
+    const pipe = new EtaPipe();
+    expect(pipe.transform(3600)).toBe('1h 0m 0s');
+    expect(pipe.transform(3661)).toBe('1h 1m 1s');
+  });
+});

ui/src/app/pipes/file-size.pipe.spec.ts

@@ -0,0 +1,24 @@
+import { FileSizePipe } from './file-size.pipe';
+
+describe('FileSizePipe', () => {
+  it('returns 0 Bytes for zero or NaN', () => {
+    const pipe = new FileSizePipe();
+    expect(pipe.transform(0)).toBe('0 Bytes');
+    expect(pipe.transform(Number.NaN)).toBe('0 Bytes');
+  });
+
+  it('formats bytes and larger units', () => {
+    const pipe = new FileSizePipe();
+    expect(pipe.transform(500)).toContain('Bytes');
+    expect(pipe.transform(1000)).toContain('KB');
+    expect(pipe.transform(1000 * 1000)).toContain('MB');
+    expect(pipe.transform(1000 ** 3)).toContain('GB');
+  });
+
+  it('handles boundaries between units', () => {
+    const pipe = new FileSizePipe();
+    expect(pipe.transform(999)).toContain('Bytes');
+    expect(pipe.transform(1000)).toContain('KB');
+    expect(pipe.transform(1001)).toContain('KB');
+  });
+});

ui/src/app/pipes/speed.pipe.spec.ts

@@ -0,0 +1,21 @@
+import { SpeedPipe } from './speed.pipe';
+
+describe('SpeedPipe', () => {
+  it('returns empty string for non-positive speed values', () => {
+    const pipe = new SpeedPipe();
+    expect(pipe.transform(0)).toBe('');
+    expect(pipe.transform(-1)).toBe('');
+  });
+
+  it('formats bytes per second values', () => {
+    const pipe = new SpeedPipe();
+    expect(pipe.transform(1024)).toBe('1 KB/s');
+    expect(pipe.transform(1536)).toBe('1.5 KB/s');
+  });
+
+  it('formats MB/s and GB/s', () => {
+    const pipe = new SpeedPipe();
+    expect(pipe.transform(1024 * 1024)).toBe('1 MB/s');
+    expect(pipe.transform(1024 * 1024 * 1024)).toBe('1 GB/s');
+  });
+});

ui/src/app/pipes/speed.pipe.ts

@@ -1,43 +1,19 @@
 import { Pipe, PipeTransform } from "@angular/core";
-import { BehaviorSubject, throttleTime } from "rxjs";
 
 @Pipe({
     name: 'speed',
-    pure: false // Make the pipe impure so it can handle async updates
+    pure: true
 })
 export class SpeedPipe implements PipeTransform {
-  private speedSubject = new BehaviorSubject<number>(0);
-  private formattedSpeed = '';
-
-  constructor() {
-    // Throttle updates to once per second
-    this.speedSubject.pipe(
-      throttleTime(1000)
-    ).subscribe(speed => {
-      // If speed is invalid or 0, return empty string
-      if (speed === null || speed === undefined || isNaN(speed) || speed <= 0) {
-        this.formattedSpeed = '';
-        return;
-      }
-      
-      const k = 1024;
-      const dm = 2;
-      const sizes = ['B/s', 'KB/s', 'MB/s', 'GB/s', 'TB/s', 'PB/s', 'EB/s', 'ZB/s', 'YB/s'];
-      const i = Math.floor(Math.log(speed) / Math.log(k));
-      this.formattedSpeed = parseFloat((speed / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
-    });
-  }
-
   transform(value: number): string {
-    // If speed is invalid or 0, return empty string
     if (value === null || value === undefined || isNaN(value) || value <= 0) {
       return '';
     }
-    
-    // Update the speed subject
-    this.speedSubject.next(value);
-    
-    // Return the last formatted speed
-    return this.formattedSpeed;
+
+    const k = 1024;
+    const decimals = 2;
+    const sizes = ['B/s', 'KB/s', 'MB/s', 'GB/s', 'TB/s', 'PB/s', 'EB/s', 'ZB/s', 'YB/s'];
+    const i = Math.floor(Math.log(value) / Math.log(k));
+    return `${parseFloat((value / Math.pow(k, i)).toFixed(decimals))} ${sizes[i]}`;
   }
 }

ui/src/app/services/downloads.service.spec.ts

@@ -0,0 +1,279 @@
+import { TestBed } from '@angular/core/testing';
+import { provideHttpClient, HttpErrorResponse } from '@angular/common/http';
+import { provideHttpClientTesting, HttpTestingController } from '@angular/common/http/testing';
+import { Subject } from 'rxjs';
+import { DownloadsService, AddDownloadPayload } from './downloads.service';
+import { MeTubeSocket } from './metube-socket.service';
+import { Download } from '../interfaces';
+
+class MeTubeSocketStub {
+  private subjects: Record<string, Subject<string>> = {};
+
+  fromEvent(event: string) {
+    if (!this.subjects[event]) {
+      this.subjects[event] = new Subject<string>();
+    }
+    return this.subjects[event].asObservable();
+  }
+
+  emit(event: string, data: string) {
+    if (!this.subjects[event]) {
+      this.subjects[event] = new Subject<string>();
+    }
+    this.subjects[event].next(data);
+  }
+}
+
+function basePayload(): AddDownloadPayload {
+  return {
+    url: 'https://example.com/v',
+    downloadType: 'video',
+    codec: 'auto',
+    quality: 'best',
+    format: 'any',
+    folder: '',
+    customNamePrefix: '',
+    playlistItemLimit: 0,
+    autoStart: true,
+    splitByChapters: false,
+    chapterTemplate: '',
+    subtitleLanguage: 'en',
+    subtitleMode: 'prefer_manual',
+  };
+}
+
+describe('DownloadsService', () => {
+  let socket: MeTubeSocketStub;
+  let httpMock: HttpTestingController;
+  let service: DownloadsService;
+
+  beforeEach(async () => {
+    socket = new MeTubeSocketStub();
+    await TestBed.configureTestingModule({
+      providers: [
+        DownloadsService,
+        provideHttpClient(),
+        provideHttpClientTesting(),
+        { provide: MeTubeSocket, useValue: socket },
+      ],
+    }).compileComponents();
+
+    service = TestBed.inject(DownloadsService);
+    httpMock = TestBed.inject(HttpTestingController);
+  });
+
+  it('add() posts snake_case fields matching backend', () => {
+    service.add(basePayload()).subscribe();
+    const req = httpMock.expectOne('add');
+    expect(req.request.method).toBe('POST');
+    expect(req.request.body).toEqual(
+      expect.objectContaining({
+        url: 'https://example.com/v',
+        download_type: 'video',
+        codec: 'auto',
+        quality: 'best',
+        format: 'any',
+        playlist_item_limit: 0,
+        auto_start: true,
+        split_by_chapters: false,
+        chapter_template: '',
+        subtitle_language: 'en',
+        subtitle_mode: 'prefer_manual',
+      }),
+    );
+    req.flush({ status: 'ok' });
+  });
+
+  it('cancelAdd posts to cancel-add', () => {
+    service.cancelAdd().subscribe();
+    const req = httpMock.expectOne('cancel-add');
+    expect(req.request.method).toBe('POST');
+    req.flush({ status: 'ok' });
+  });
+
+  it('startById posts ids', () => {
+    service.startById(['a', 'b']).subscribe();
+    const req = httpMock.expectOne('start');
+    expect(req.request.body).toEqual({ ids: ['a', 'b'] });
+    req.flush({});
+  });
+
+  it('delById marks items deleting and posts delete', () => {
+    const dl: Download = {
+      id: '1',
+      title: 't',
+      url: 'u1',
+      download_type: 'video',
+      quality: 'best',
+      format: 'any',
+      folder: '',
+      custom_name_prefix: '',
+      playlist_item_limit: 0,
+      status: 'finished',
+      msg: '',
+      percent: 0,
+      speed: 0,
+      eta: 0,
+      filename: '',
+      checked: false,
+      deleting: false,
+    };
+    service.queue.set('u1', dl);
+    service.delById('queue', ['u1']).subscribe();
+    expect(dl.deleting).toBe(true);
+    const req = httpMock.expectOne('delete');
+    expect(req.request.body).toEqual({ where: 'queue', ids: ['u1'] });
+    req.flush({});
+  });
+
+  it('handleHTTPError extracts msg from object body', async () => {
+    const err = new HttpErrorResponse({
+      error: { msg: 'bad' },
+      status: 400,
+    });
+    const res = await new Promise((resolve) => {
+      service.handleHTTPError(err).subscribe(resolve);
+    });
+    expect((res as { status: string }).status).toBe('error');
+    expect((res as { msg?: string }).msg).toBe('bad');
+  });
+
+  it('socket all updates queue and done', () => {
+    const row: Download = {
+      id: '1',
+      title: 't',
+      url: 'u1',
+      download_type: 'video',
+      quality: 'best',
+      format: 'any',
+      folder: '',
+      custom_name_prefix: '',
+      playlist_item_limit: 0,
+      status: 'pending',
+      msg: '',
+      percent: 0,
+      speed: 0,
+      eta: 0,
+      filename: '',
+      checked: false,
+    };
+    const q: [string, Download][] = [['u1', row]];
+    const d: [string, Download][] = [];
+    socket.emit('all', JSON.stringify([q, d]));
+    expect(service.loading).toBe(false);
+    expect(service.queue.has('u1')).toBe(true);
+  });
+
+  it('socket updated preserves checked and deleting', () => {
+    service.queue.set('u1', {
+      id: '1',
+      title: 't',
+      url: 'u1',
+      download_type: 'video',
+      quality: 'best',
+      format: 'any',
+      folder: '',
+      custom_name_prefix: '',
+      playlist_item_limit: 0,
+      status: 'pending',
+      msg: '',
+      percent: 0,
+      speed: 0,
+      eta: 0,
+      filename: '',
+      checked: true,
+      deleting: true,
+    });
+    socket.emit(
+      'updated',
+      JSON.stringify({ url: 'u1', title: 't', status: 'downloading' }),
+    );
+    const updated = service.queue.get('u1');
+    expect(updated?.checked).toBe(true);
+    expect(updated?.deleting).toBe(true);
+  });
+
+  it('socket completed moves entry to done', () => {
+    service.queue.set('u1', {
+      id: '1',
+      title: 't',
+      url: 'u1',
+      download_type: 'video',
+      quality: 'best',
+      format: 'any',
+      folder: '',
+      custom_name_prefix: '',
+      playlist_item_limit: 0,
+      status: 'pending',
+      msg: '',
+      percent: 0,
+      speed: 0,
+      eta: 0,
+      filename: '',
+      checked: false,
+    });
+    socket.emit('completed', JSON.stringify({ url: 'u1', title: 't', status: 'finished' }));
+    expect(service.queue.has('u1')).toBe(false);
+    expect(service.done.has('u1')).toBe(true);
+  });
+
+  it('socket canceled removes from queue', () => {
+    service.queue.set('u1', {
+      id: '1',
+      title: 't',
+      url: 'u1',
+      download_type: 'video',
+      quality: 'best',
+      format: 'any',
+      folder: '',
+      custom_name_prefix: '',
+      playlist_item_limit: 0,
+      status: 'pending',
+      msg: '',
+      percent: 0,
+      speed: 0,
+      eta: 0,
+      filename: '',
+      checked: false,
+    });
+    socket.emit('canceled', JSON.stringify('u1'));
+    expect(service.queue.has('u1')).toBe(false);
+  });
+
+  it('socket cleared removes from done', () => {
+    service.done.set('u1', {
+      id: '1',
+      title: 't',
+      url: 'u1',
+      download_type: 'video',
+      quality: 'best',
+      format: 'any',
+      folder: '',
+      custom_name_prefix: '',
+      playlist_item_limit: 0,
+      status: 'finished',
+      msg: '',
+      percent: 0,
+      speed: 0,
+      eta: 0,
+      filename: '',
+      checked: false,
+    });
+    socket.emit('cleared', JSON.stringify('u1'));
+    expect(service.done.has('u1')).toBe(false);
+  });
+
+  it('socket configuration updates configuration', () => {
+    socket.emit('configuration', JSON.stringify({ CUSTOM_DIRS: true }));
+    expect(service.configuration['CUSTOM_DIRS']).toBe(true);
+  });
+
+  it('socket custom_dirs updates customDirs', () => {
+    socket.emit('custom_dirs', JSON.stringify({ download_dir: [''] }));
+    expect(service.customDirs['download_dir']).toEqual(['']);
+  });
+
+  afterEach(() => {
+    httpMock.verify();
+  });
+});

ui/src/app/services/downloads.service.ts

@@ -5,6 +5,22 @@ import { catchError } from 'rxjs/operators';
 import { MeTubeSocket } from './metube-socket.service';
 import { Download, Status, State } from '../interfaces';
 import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
+
+export interface AddDownloadPayload {
+  url: string;
+  downloadType: string;
+  codec: string;
+  quality: string;
+  format: string;
+  folder: string;
+  customNamePrefix: string;
+  playlistItemLimit: number;
+  autoStart: boolean;
+  splitByChapters: boolean;
+  chapterTemplate: string;
+  subtitleLanguage: string;
+  subtitleMode: string;
+}
 @Injectable({
   providedIn: 'root'
 })
@@ -14,16 +30,15 @@ export class DownloadsService {
   loading = true;
   queue = new Map<string, Download>();
   done = new Map<string, Download>();
-  queueChanged = new Subject();
-  doneChanged = new Subject();
-  customDirsChanged = new Subject();
-  ytdlOptionsChanged = new Subject();
-  configurationChanged = new Subject();
-  updated = new Subject();
+  queueChanged = new Subject<void>();
+  doneChanged = new Subject<void>();
+  customDirsChanged = new Subject<Record<string, string[]>>();
+  ytdlOptionsChanged = new Subject<Record<string, unknown>>();
+  configurationChanged = new Subject<Record<string, unknown>>();
+  updated = new Subject<void>();
 
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  configuration: any = {};
-  customDirs = {};
+  configuration: Record<string, unknown> = {};
+  customDirs: Record<string, string[]> = {};
 
   constructor() {
     this.socket.fromEvent('all')
@@ -35,15 +50,15 @@ export class DownloadsService {
       data[0].forEach(entry => this.queue.set(...entry));
       this.done.clear();
       data[1].forEach(entry => this.done.set(...entry));
-      this.queueChanged.next(null);
-      this.doneChanged.next(null);
+      this.queueChanged.next();
+      this.doneChanged.next();
     });
     this.socket.fromEvent('added')
     .pipe(takeUntilDestroyed())
     .subscribe((strdata: string) => {
       const data: Download = JSON.parse(strdata);
       this.queue.set(data.url, data);
-      this.queueChanged.next(null);
+      this.queueChanged.next();
     });
     this.socket.fromEvent('updated')
     .pipe(takeUntilDestroyed())
@@ -53,7 +68,7 @@ export class DownloadsService {
       data.checked = !!dl?.checked;
       data.deleting = !!dl?.deleting;
       this.queue.set(data.url, data);
-      this.updated.next(null);
+      this.updated.next();
     });
     this.socket.fromEvent('completed')
     .pipe(takeUntilDestroyed())
@@ -61,22 +76,22 @@ export class DownloadsService {
       const data: Download = JSON.parse(strdata);
       this.queue.delete(data.url);
       this.done.set(data.url, data);
-      this.queueChanged.next(null);
-      this.doneChanged.next(null);
+      this.queueChanged.next();
+      this.doneChanged.next();
     });
     this.socket.fromEvent('canceled')
     .pipe(takeUntilDestroyed())
     .subscribe((strdata: string) => {
       const data: string = JSON.parse(strdata);
       this.queue.delete(data);
-      this.queueChanged.next(null);
+      this.queueChanged.next();
     });
     this.socket.fromEvent('cleared')
     .pipe(takeUntilDestroyed())
     .subscribe((strdata: string) => {
       const data: string = JSON.parse(strdata);
       this.done.delete(data);
-      this.doneChanged.next(null);
+      this.doneChanged.next();
     });
     this.socket.fromEvent('configuration')
     .pipe(takeUntilDestroyed())
@@ -103,37 +118,29 @@ export class DownloadsService {
   }
 
   handleHTTPError(error: HttpErrorResponse) {
-    const msg = error.error instanceof ErrorEvent ? error.error.message : error.error;
-    return of({status: 'error', msg: msg})
+    const msg = error.error instanceof ErrorEvent
+      ? error.error.message
+      : (typeof error.error === 'string'
+          ? error.error
+          : (error.error?.msg || error.message || 'Request failed'));
+    return of({ status: 'error', msg });
   }
 
-  public add(
-    url: string,
-    quality: string,
-    format: string,
-    folder: string,
-    customNamePrefix: string,
-    playlistItemLimit: number,
-    autoStart: boolean,
-    splitByChapters: boolean,
-    chapterTemplate: string,
-    subtitleFormat: string,
-    subtitleLanguage: string,
-    subtitleMode: string,
-  ) {
+  public add(payload: AddDownloadPayload) {
     return this.http.post<Status>('add', {
-      url: url,
-      quality: quality,
-      format: format,
-      folder: folder,
-      custom_name_prefix: customNamePrefix,
-      playlist_item_limit: playlistItemLimit,
-      auto_start: autoStart,
-      split_by_chapters: splitByChapters,
-      chapter_template: chapterTemplate,
-      subtitle_format: subtitleFormat,
-      subtitle_language: subtitleLanguage,
-      subtitle_mode: subtitleMode
+      url: payload.url,
+      download_type: payload.downloadType,
+      codec: payload.codec,
+      quality: payload.quality,
+      format: payload.format,
+      folder: payload.folder,
+      custom_name_prefix: payload.customNamePrefix,
+      playlist_item_limit: payload.playlistItemLimit,
+      auto_start: payload.autoStart,
+      split_by_chapters: payload.splitByChapters,
+      chapter_template: payload.chapterTemplate,
+      subtitle_language: payload.subtitleLanguage,
+      subtitle_mode: payload.subtitleMode,
     }).pipe(
       catchError(this.handleHTTPError)
     );
@@ -167,47 +174,6 @@ export class DownloadsService {
     this[where].forEach((dl: Download) => { if (filter(dl)) ids.push(dl.url) });
     return this.delById(where, ids);
   }
-  public addDownloadByUrl(url: string): Promise<{
-    response: Status} | {
-    status: string;
-    msg?: string;
-  }> {
-    const defaultQuality = 'best';
-    const defaultFormat = 'mp4';
-    const defaultFolder = ''; 
-    const defaultCustomNamePrefix = '';
-    const defaultPlaylistItemLimit = 0;
-    const defaultAutoStart = true;
-    const defaultSplitByChapters = false;
-    const defaultChapterTemplate = this.configuration['OUTPUT_TEMPLATE_CHAPTER'];
-    const defaultSubtitleFormat = 'srt';
-    const defaultSubtitleLanguage = 'en';
-    const defaultSubtitleMode = 'prefer_manual';
-
-    return new Promise((resolve, reject) => {
-      this.add(
-        url,
-        defaultQuality,
-        defaultFormat,
-        defaultFolder,
-        defaultCustomNamePrefix,
-        defaultPlaylistItemLimit,
-        defaultAutoStart,
-        defaultSplitByChapters,
-        defaultChapterTemplate,
-        defaultSubtitleFormat,
-        defaultSubtitleLanguage,
-        defaultSubtitleMode,
-      )
-        .subscribe({
-          next: (response) => resolve(response),
-          error: (error) => reject(error)
-        });
-    });
-  }
-  public exportQueueUrls(): string[] {
-    return Array.from(this.queue.values()).map(download => download.url);
-  }
   public cancelAdd() {
     return this.http.post<Status>('cancel-add', {}).pipe(
       catchError(this.handleHTTPError)
@@ -217,19 +183,19 @@ export class DownloadsService {
   uploadCookies(file: File) {
     const formData = new FormData();
     formData.append('cookies', file);
-    return this.http.post<any>('upload-cookies', formData).pipe(
+    return this.http.post<{ status: string; msg?: string }>('upload-cookies', formData).pipe(
       catchError(this.handleHTTPError)
     );
   }
 
   deleteCookies() {
-    return this.http.post<any>('delete-cookies', {}).pipe(
+    return this.http.post<{ status: string; msg?: string }>('delete-cookies', {}).pipe(
       catchError(this.handleHTTPError)
     );
   }
 
   getCookieStatus() {
-    return this.http.get<any>('cookie-status').pipe(
+    return this.http.get<{ status: string; has_cookies: boolean }>('cookie-status').pipe(
       catchError(this.handleHTTPError)
     );
   }

ui/src/app/services/index.ts

@@ -1,3 +1,2 @@
 export { DownloadsService } from './downloads.service';
-export { SpeedService } from './speed.service';
 export { MeTubeSocket } from './metube-socket.service';

ui/src/app/services/speed.service.ts

@@ -1,39 +0,0 @@
-import { Injectable } from '@angular/core';
-import { BehaviorSubject, Observable, interval } from 'rxjs';
-import { map } from 'rxjs/operators';
-
-@Injectable({
-  providedIn: 'root'
-})
-export class SpeedService {
-  private speedBuffer = new BehaviorSubject<number[]>([]);
-  private readonly BUFFER_SIZE = 10; // Keep last 10 measurements (1 second at 100ms intervals)
-
-  // Observable that emits the mean speed every second
-  public meanSpeed$: Observable<number>;
-
-  constructor() {
-    // Calculate mean speed every second
-    this.meanSpeed$ = interval(1000).pipe(
-      map(() => {
-        const speeds = this.speedBuffer.value;
-        if (speeds.length === 0) return 0;
-        return speeds.reduce((sum, speed) => sum + speed, 0) / speeds.length;
-      })
-    );
-  }
-
-  // Add a new speed measurement
-  public addSpeedMeasurement(speed: number) {
-    const currentBuffer = this.speedBuffer.value;
-    const newBuffer = [...currentBuffer, speed].slice(-this.BUFFER_SIZE);
-    this.speedBuffer.next(newBuffer);
-  }
-
-  // Get the current mean speed
-  public getCurrentMeanSpeed(): number {
-    const speeds = this.speedBuffer.value;
-    if (speeds.length === 0) return 0;
-    return speeds.reduce((sum, speed) => sum + speed, 0) / speeds.length;
-  }
-} 

ui/src/app/services/subscriptions.service.ts

@@ -0,0 +1,128 @@
+import { DestroyRef, inject, Injectable } from '@angular/core';
+import { HttpClient, HttpErrorResponse } from '@angular/common/http';
+import { of, Subject } from 'rxjs';
+import { catchError, tap } from 'rxjs/operators';
+import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
+import { MeTubeSocket } from './metube-socket.service';
+import { SubscriptionRow } from '../interfaces/subscription';
+import { Status } from '../interfaces';
+import { AddDownloadPayload } from './downloads.service';
+
+export interface SubscribePayload extends AddDownloadPayload {
+  checkIntervalMinutes: number;
+}
+
+@Injectable({
+  providedIn: 'root',
+})
+export class SubscriptionsService {
+  private http = inject(HttpClient);
+  private socket = inject(MeTubeSocket);
+  private destroyRef = inject(DestroyRef);
+
+  subscriptions = new Map<string, SubscriptionRow>();
+  subscriptionsChanged = new Subject<void>();
+
+  private publishList(rows: SubscriptionRow[]) {
+    this.subscriptions.clear();
+    for (const row of rows) {
+      this.subscriptions.set(row.id, row);
+    }
+    this.subscriptionsChanged.next();
+  }
+
+  constructor() {
+    this.socket
+      .fromEvent('subscriptions_all')
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe((strdata: string) => {
+        const data: SubscriptionRow[] = JSON.parse(strdata);
+        this.publishList(data);
+      });
+
+    this.socket
+      .fromEvent('subscription_added')
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe((strdata: string) => {
+        const row: SubscriptionRow = JSON.parse(strdata);
+        this.subscriptions.set(row.id, row);
+        this.subscriptionsChanged.next();
+      });
+
+    this.socket
+      .fromEvent('subscription_updated')
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe((strdata: string) => {
+        const row: SubscriptionRow = JSON.parse(strdata);
+        this.subscriptions.set(row.id, row);
+        this.subscriptionsChanged.next();
+      });
+
+    this.socket
+      .fromEvent('subscription_removed')
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe((strdata: string) => {
+        const id: string = JSON.parse(strdata);
+        this.subscriptions.delete(id);
+        this.subscriptionsChanged.next();
+      });
+  }
+
+  handleHTTPError(error: HttpErrorResponse) {
+    const msg =
+      error.error instanceof ErrorEvent
+        ? error.error.message
+        : typeof error.error === 'string'
+          ? error.error
+          : error.error?.msg || error.message || 'Request failed';
+    return of({ status: 'error' as const, msg });
+  }
+
+  subscribe(payload: SubscribePayload) {
+    return this.http
+      .post<Status>('subscribe', {
+        url: payload.url,
+        download_type: payload.downloadType,
+        codec: payload.codec,
+        quality: payload.quality,
+        format: payload.format,
+        folder: payload.folder,
+        custom_name_prefix: payload.customNamePrefix,
+        playlist_item_limit: payload.playlistItemLimit,
+        auto_start: payload.autoStart,
+        split_by_chapters: payload.splitByChapters,
+        chapter_template: payload.chapterTemplate,
+        subtitle_language: payload.subtitleLanguage,
+        subtitle_mode: payload.subtitleMode,
+        check_interval_minutes: payload.checkIntervalMinutes,
+      })
+      .pipe(catchError((err) => this.handleHTTPError(err)));
+  }
+
+  delete(ids: string[]) {
+    return this.http.post('subscriptions/delete', { ids }).pipe(catchError((err) => this.handleHTTPError(err)));
+  }
+
+  update(id: string, changes: Partial<Pick<SubscriptionRow, 'enabled' | 'check_interval_minutes' | 'name'>>) {
+    return this.http
+      .post('subscriptions/update', { id, ...changes })
+      .pipe(catchError((err) => this.handleHTTPError(err)));
+  }
+
+  checkNow(ids?: string[]) {
+    return this.http
+      .post('subscriptions/check', ids?.length ? { ids } : {})
+      .pipe(catchError((err) => this.handleHTTPError(err)));
+  }
+
+  fetchList() {
+    return this.http.get<SubscriptionRow[]>('subscriptions').pipe(catchError(() => of([])));
+  }
+
+  refreshList() {
+    return this.http.get<SubscriptionRow[]>('subscriptions').pipe(
+      tap((rows) => this.publishList(rows)),
+      catchError((err) => this.handleHTTPError(err)),
+    );
+  }
+}

ui/src/styles.sass

@@ -5,3 +5,22 @@
 
     [data-bs-theme="dark"] &
         background-color: var(--bs-dark-bg-subtle) !important
+
+.ng-select
+    flex: 1
+
+    .ng-select-container
+        min-height: 38px
+
+    .ng-value
+        white-space: nowrap
+        overflow: visible
+
+    .ng-dropdown-panel
+        .ng-dropdown-panel-items
+            max-height: 300px
+
+            .ng-option
+                white-space: nowrap
+                overflow: visible
+                text-overflow: ellipsis

uv.lock

@@ -13,7 +13,7 @@ wheels = [
 
 [[package]]
 name = "aiohttp"
-version = "3.13.3"
+version = "3.13.5"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "aiohappyeyeballs" },
@@ -24,59 +24,59 @@ dependencies = [
     { name = "propcache" },
     { name = "yarl" },
 ]
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