upgrade dependencies

app/main.py

@@ -112,6 +112,13 @@ class Config:
         if not self.URL_PREFIX.endswith('/'):
             self.URL_PREFIX += '/'
 
+        # A blank PUBLIC_HOST_AUDIO_URL (e.g. set empty in a compose file) bypasses the
+        # default via os.environ.get, which would leave audio links root-relative and 404.
+        # Fall back to the 'audio_download/' route that serves AUDIO_DOWNLOAD_DIR. When
+        # PUBLIC_HOST_URL is also blank we leave it blank to preserve serving from web root.
+        if not self.PUBLIC_HOST_AUDIO_URL and self.PUBLIC_HOST_URL:
+            self.PUBLIC_HOST_AUDIO_URL = self._DEFAULTS['PUBLIC_HOST_AUDIO_URL']
+
         for attr in ('PUBLIC_HOST_URL', 'PUBLIC_HOST_AUDIO_URL'):
             val = getattr(self, attr)
             if val and not val.endswith('/'):
@@ -130,6 +137,10 @@ class Config:
             )
             sys.exit(1)
 
+        self._validate_int('MAX_CONCURRENT_DOWNLOADS', minimum=1)
+        self._validate_int('PORT', minimum=1, maximum=65535)
+        self._validate_int('CLEAR_COMPLETED_AFTER', minimum=0)
+
         self._runtime_overrides = {}
 
         success,_ = self.load_ytdl_options()
@@ -139,6 +150,20 @@ class Config:
         if not success:
             sys.exit(1)
 
+    def _validate_int(self, key, *, minimum=None, maximum=None):
+        raw = getattr(self, key)
+        try:
+            value = int(raw)
+        except (TypeError, ValueError):
+            log.error('Environment variable "%s" must be an integer, got "%s"', key, raw)
+            sys.exit(1)
+        if minimum is not None and value < minimum:
+            log.error('Environment variable "%s" must be >= %d, got "%s"', key, minimum, raw)
+            sys.exit(1)
+        if maximum is not None and value > maximum:
+            log.error('Environment variable "%s" must be <= %d, got "%s"', key, maximum, raw)
+            sys.exit(1)
+
     def set_runtime_override(self, key, value):
         self._runtime_overrides[key] = value
         self.YTDL_OPTIONS[key] = value
@@ -241,7 +266,13 @@ logging.getLogger().setLevel(parseLogLevel(str(config.LOGLEVEL)) or logging.INFO
 
 class ObjectSerializer(json.JSONEncoder):
     def default(self, obj):
-        # First try to use __dict__ for custom objects
+        # Prefer an explicit client-facing view when the object provides one
+        # (e.g. DownloadInfo / SubscriptionInfo) so server-only or bulky fields
+        # are never broadcast to browser clients.
+        to_public = getattr(obj, 'to_public_dict', None)
+        if callable(to_public):
+            return to_public()
+        # Fall back to __dict__ for other custom objects
         if hasattr(obj, '__dict__'):
             return obj.__dict__
         # Convert iterables (generators, dict_items, etc.) to lists
@@ -827,10 +858,7 @@ async def cancel_add(request):
 @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
@@ -964,6 +992,12 @@ async def upload_cookies(request):
     tmp_cookie_path = f"{COOKIES_PATH}.tmp"
     with open(tmp_cookie_path, 'wb') as f:
         f.write(content)
+    # Cookies are sensitive auth material; restrict to owner read/write only
+    # (the container's default umask would otherwise leave them group/world readable).
+    try:
+        os.chmod(tmp_cookie_path, 0o600)
+    except OSError as exc:
+        log.warning(f'Could not restrict permissions on cookies file: {exc}')
     os.replace(tmp_cookie_path, COOKIES_PATH)
     config.set_runtime_override('cookiefile', COOKIES_PATH)
     log.info(f'Cookies file uploaded ({size} bytes)')

app/subscriptions.py

@@ -312,6 +312,7 @@ class SubscriptionManager:
         self._subs: dict[str, SubscriptionInfo] = {}
         self._url_index: dict[str, str] = {}  # normalized url -> id
         self._pending_urls: set[str] = set()
+        self._checks_in_flight: set[str] = set()  # subscription ids being checked right now
         self._lock = asyncio.Lock()
         self._loop_task: Optional[asyncio.Task] = None
         self._load_all()
@@ -677,6 +678,22 @@ class SubscriptionManager:
         return {"status": "ok"}
 
     async def _check_one_unlocked(self, sub: SubscriptionInfo) -> None:
+        sid = sub.id
+        # Prevent overlapping checks for the same subscription (e.g. the periodic
+        # loop and a manual check-now firing together), which could double-queue
+        # entries and drop seen_ids via a read-modify-write race.
+        async with self._lock:
+            if sid in self._checks_in_flight:
+                log.info("Subscription check already in progress for %s, skipping", sub.name)
+                return
+            self._checks_in_flight.add(sid)
+        try:
+            await self._check_one_inner(sub)
+        finally:
+            async with self._lock:
+                self._checks_in_flight.discard(sid)
+
+    async def _check_one_inner(self, sub: SubscriptionInfo) -> None:
         sid = sub.id
         scan = int(getattr(self.config, "SUBSCRIPTION_SCAN_PLAYLIST_END", 50))
         log.info("Checking subscription: %s", sub.name)

app/tests/test_config.py

@@ -51,6 +51,19 @@ class ConfigTests(unittest.TestCase):
         self.assertEqual(c.PUBLIC_HOST_URL, "")
         self.assertEqual(c.PUBLIC_HOST_AUDIO_URL, "")
 
+    def test_blank_audio_host_falls_back_to_audio_download_route(self):
+        # Regression: a present-but-blank PUBLIC_HOST_AUDIO_URL must not stay empty
+        # (which produced root-relative, 404ing audio links). It falls back to the
+        # 'audio_download/' route that serves AUDIO_DOWNLOAD_DIR.
+        with patch.dict(
+            os.environ,
+            _base_env(PUBLIC_HOST_URL="https://ytdl.example.com", PUBLIC_HOST_AUDIO_URL=""),
+            clear=False,
+        ):
+            c = Config()
+        self.assertEqual(c.PUBLIC_HOST_URL, "https://ytdl.example.com/")
+        self.assertEqual(c.PUBLIC_HOST_AUDIO_URL, "audio_download/")
+
     def test_public_host_url_already_slashed_unchanged(self):
         with patch.dict(
             os.environ,
@@ -123,6 +136,29 @@ class ConfigTests(unittest.TestCase):
                 with self.assertRaises(SystemExit):
                     Config()
 
+    def test_invalid_max_concurrent_downloads_exits(self):
+        for bad in ("0", "-1", "abc"):
+            with patch.dict(os.environ, _base_env(MAX_CONCURRENT_DOWNLOADS=bad), clear=False):
+                with self.assertRaises(SystemExit):
+                    Config()
+
+    def test_invalid_port_exits(self):
+        for bad in ("0", "70000", "notaport"):
+            with patch.dict(os.environ, _base_env(PORT=bad), clear=False):
+                with self.assertRaises(SystemExit):
+                    Config()
+
+    def test_invalid_clear_completed_after_exits(self):
+        for bad in ("-5", "soon"):
+            with patch.dict(os.environ, _base_env(CLEAR_COMPLETED_AFTER=bad), clear=False):
+                with self.assertRaises(SystemExit):
+                    Config()
+
+    def test_clear_completed_after_zero_allowed(self):
+        with patch.dict(os.environ, _base_env(CLEAR_COMPLETED_AFTER="0"), clear=False):
+            c = Config()
+        self.assertEqual(c.CLEAR_COMPLETED_AFTER, "0")
+
     def test_runtime_override_roundtrip(self):
         with patch.dict(os.environ, _base_env(), clear=False):
             c = Config()

app/tests/test_download_queue.py

@@ -627,3 +627,63 @@ def test_seconds_until_next_probe_none_when_empty(dq_env):
     notifier = AsyncMock()
     dq = DownloadQueue(dq_env, notifier)
     assert dq._seconds_until_next_probe() is None
+
+
+def test_calc_download_path_allows_subfolder(dq_env):
+    notifier = AsyncMock()
+    dq = DownloadQueue(dq_env, notifier)
+    path, err = dq._DownloadQueue__calc_download_path("video", "sub/dir")
+    assert err is None
+    assert os.path.realpath(path) == os.path.join(os.path.realpath(dq_env.DOWNLOAD_DIR), "sub", "dir")
+
+
+def test_calc_download_path_rejects_sibling_prefix_escape(dq_env):
+    """A folder resolving to a sibling sharing a name prefix must be rejected.
+
+    Regression test: ``startswith`` would have accepted ``../downloads-secret``
+    when the base directory is ``.../downloads``.
+    """
+    notifier = AsyncMock()
+    base = os.path.realpath(dq_env.DOWNLOAD_DIR)
+    sibling = base + "-secret"
+    os.makedirs(sibling, exist_ok=True)
+    dq = DownloadQueue(dq_env, notifier)
+    escape_folder = os.path.join("..", os.path.basename(sibling), "x")
+    path, err = dq._DownloadQueue__calc_download_path("video", escape_folder)
+    assert path is None
+    assert err is not None and err["status"] == "error"
+
+
+def test_calc_download_path_rejects_parent_escape(dq_env):
+    notifier = AsyncMock()
+    dq = DownloadQueue(dq_env, notifier)
+    path, err = dq._DownloadQueue__calc_download_path("video", "../../etc")
+    assert path is None
+    assert err is not None and err["status"] == "error"
+
+
+def test_download_info_to_public_dict_excludes_server_only_fields():
+    info = DownloadInfo(
+        id="vid1",
+        title="Test Video",
+        url="https://example.com/watch?v=1",
+        quality="best",
+        download_type="video",
+        codec="auto",
+        format="any",
+        folder="",
+        custom_name_prefix="",
+        error=None,
+        entry={"id": "vid1", "huge": "x" * 100000},
+        playlist_item_limit=0,
+        split_by_chapters=False,
+        chapter_template="",
+    )
+    info.subtitle_files = [{"filename": "a.srt", "size": 10}]
+    public = info.to_public_dict()
+    assert "entry" not in public
+    assert "subtitle_files" not in public
+    # Client-facing fields are still present.
+    assert public["url"] == "https://example.com/watch?v=1"
+    assert public["title"] == "Test Video"
+    assert public["status"] == "pending"

app/ytdl.py

@@ -232,6 +232,20 @@ class DownloadInfo:
         self.live_release_timestamp = live_release_timestamp
         self.subtitle_files = []
 
+    # Fields that are useful server-side but must not be broadcast to browser
+    # clients: ``entry`` is the full yt-dlp info-dict (potentially large and
+    # re-sent on every progress tick) and ``subtitle_files`` is only used
+    # internally to derive the primary caption ``filename``.
+    _PUBLIC_EXCLUDED_FIELDS = ("entry", "subtitle_files")
+
+    def to_public_dict(self) -> dict:
+        """Return the client-facing view, omitting server-only/bulky fields."""
+        return {
+            k: v
+            for k, v in self.__dict__.items()
+            if k not in self._PUBLIC_EXCLUDED_FIELDS
+        }
+
     def __setstate__(self, state):
         """BACKWARD COMPATIBILITY: migrate old DownloadInfo from persistent queue files."""
         self.__dict__.update(state)
@@ -584,7 +598,10 @@ class Download:
                 self.info.filename = rel_name
                 self.info.size = os.path.getsize(fileName) if os.path.exists(fileName) else None
                 if getattr(self.info, 'download_type', '') == 'thumbnail':
-                    self.info.filename = re.sub(r'\.webm$', '.jpg', self.info.filename)
+                    # The thumbnail convertor always emits a .jpg, but yt-dlp may
+                    # report the pre-conversion media/thumbnail extension
+                    # (.webm/.mp4/.png/.webp/...). Normalise to .jpg regardless.
+                    self.info.filename = os.path.splitext(self.info.filename)[0] + '.jpg'
 
             # Handle chapter files
             log.debug(f"Update status for {self.info.title}: {status}")
@@ -647,8 +664,8 @@ class PersistentQueue:
     def __init__(self, name, path):
         self.identifier = name
         pdir = os.path.dirname(path)
-        if not os.path.isdir(pdir):
-            os.mkdir(pdir)
+        if pdir and not os.path.isdir(pdir):
+            os.makedirs(pdir, exist_ok=True)
         self.legacy_path = path
         self.path = f"{path}.json"
         self.store = AtomicJsonStore(self.path, kind=f"persistent_queue:{name}")
@@ -1026,7 +1043,16 @@ class DownloadQueue:
                 return None, {'status': 'error', 'msg': 'A folder for the download was specified but CUSTOM_DIRS is not true in the configuration.'}
             dldirectory = os.path.realpath(os.path.join(base_directory, folder))
             real_base_directory = os.path.realpath(base_directory)
-            if not dldirectory.startswith(real_base_directory):
+            # Use commonpath rather than startswith so that a sibling directory
+            # sharing a name prefix (e.g. base "/downloads" vs "/downloads-secret")
+            # cannot be reached via "../downloads-secret".
+            try:
+                inside_base = os.path.commonpath([real_base_directory, dldirectory]) == real_base_directory
+            except ValueError:
+                # Raised when paths are on different drives (Windows) or mix
+                # absolute/relative; treat as outside the base directory.
+                inside_base = False
+            if not inside_base:
                 return None, {'status': 'error', 'msg': f'Folder "{folder}" must resolve inside the base download directory "{real_base_directory}"'}
             if not os.path.isdir(dldirectory):
                 if not self.config.CREATE_CUSTOM_DIRS:
@@ -1387,11 +1413,28 @@ class DownloadQueue:
                 continue
             if self.config.DELETE_FILE_ON_TRASHCAN:
                 dl = self.done.get(id)
+                dldirectory, calc_error = self.__calc_download_path(dl.info.download_type, dl.info.folder)
+                if calc_error is not None or not dldirectory:
+                    log.warning(f'deleting files for download {id} skipped: could not resolve download directory')
+                else:
+                    # Remove the primary output plus any per-chapter / per-subtitle
+                    # outputs. Each filename is relative to the download directory.
+                    rel_names = []
+                    if getattr(dl.info, 'filename', None):
+                        rel_names.append(dl.info.filename)
+                    for extra in (getattr(dl.info, 'chapter_files', None) or []):
+                        if isinstance(extra, dict) and extra.get('filename'):
+                            rel_names.append(extra['filename'])
+                    for extra in (getattr(dl.info, 'subtitle_files', None) or []):
+                        if isinstance(extra, dict) and extra.get('filename'):
+                            rel_names.append(extra['filename'])
+                    for rel_name in rel_names:
                         try:
-                    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.warning(f'deleting file for download {id} failed with error message {e!r}')
+                            os.remove(os.path.join(dldirectory, rel_name))
+                        except FileNotFoundError:
+                            pass
+                        except OSError as e:
+                            log.warning(f'deleting file "{rel_name}" for download {id} failed with error message {e!r}')
             self.done.delete(id)
             await self.notifier.cleared(id)
         return {'status': 'ok'}

ui/package.json

@@ -48,8 +48,8 @@
   },
   "devDependencies": {
     "@angular-eslint/builder": "21.1.0",
-    "@angular/build": "^21.2.14",
-    "@angular/cli": "^21.2.14",
+    "@angular/build": "^21.2.15",
+    "@angular/cli": "^21.2.15",
     "@angular/compiler-cli": "^21.2.17",
     "@angular/localize": "^21.2.17",
     "@eslint/js": "^9.39.4",
@@ -58,6 +58,6 @@
     "jsdom": "^27.4.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "8.47.0",
-    "vitest": "^4.1.8"
+    "vitest": "^4.1.9"
   }
 }

ui/src/app/app.html

@@ -1078,3 +1078,5 @@
     }
   </div>
 </footer>
+
+<app-toast-container />

ui/src/app/app.spec.ts

@@ -4,6 +4,7 @@ import { Subject, of } from 'rxjs';
 import { App } from './app';
 import { DownloadsService } from './services/downloads.service';
 import { SubscriptionsService } from './services/subscriptions.service';
+import { ToastService } from './services/toast.service';
 import { CookieService } from 'ngx-cookie-service';
 
 class DownloadsServiceStub {
@@ -263,7 +264,8 @@ describe('App', () => {
   });
 
   it('blocks subscribe with invalid title regex', () => {
-    const alertSpy = vi.spyOn(window, 'alert').mockImplementation(() => undefined);
+    const toasts = TestBed.inject(ToastService);
+    const errorSpy = vi.spyOn(toasts, 'error').mockImplementation(() => undefined);
     const fixture = TestBed.createComponent(App);
     const app = fixture.componentInstance;
     const subs = TestBed.inject(SubscriptionsService) as unknown as SubscriptionsServiceStub;
@@ -271,7 +273,7 @@ describe('App', () => {
     app.titleRegex = '[';
     app.addSubscription();
     expect(subs.subscribeCalls.length).toBe(0);
-    expect(alertSpy).toHaveBeenCalledWith('Invalid subscription title filter (regex)');
-    alertSpy.mockRestore();
+    expect(errorSpy).toHaveBeenCalledWith('Invalid subscription title filter (regex)');
+    errorSpy.mockRestore();
   });
 });

ui/src/app/app.ts

@@ -13,6 +13,8 @@ import { CookieService } from 'ngx-cookie-service';
 import { AddDownloadPayload, DownloadsService } from './services/downloads.service';
 import { MeTubeSocket } from './services/metube-socket.service';
 import { SubscriptionsService } from './services/subscriptions.service';
+import { ToastService } from './services/toast.service';
+import { BatchUrlsService, BatchUrlFilter } from './services/batch-urls.service';
 import { SubscriptionRow } from './interfaces/subscription';
 import { Themes } from './theme';
 import {
@@ -32,7 +34,7 @@ import {
   State,
 } from './interfaces';
 import { EtaPipe, SpeedPipe, FileSizePipe } from './pipes';
-import { SelectAllCheckboxComponent, ItemCheckboxComponent } from './components/';
+import { SelectAllCheckboxComponent, ItemCheckboxComponent, ToastContainerComponent } from './components/';
 
 @Component({
   selector: 'app-root',
@@ -50,6 +52,7 @@ import { SelectAllCheckboxComponent, ItemCheckboxComponent } from './components/
         FileSizePipe,
         SelectAllCheckboxComponent,
         ItemCheckboxComponent,
+        ToastContainerComponent,
   ],
   templateUrl: './app.html',
   styleUrl: './app.sass',
@@ -57,6 +60,8 @@ import { SelectAllCheckboxComponent, ItemCheckboxComponent } from './components/
 export class App implements AfterViewInit, OnInit, OnDestroy {
   downloads = inject(DownloadsService);
   subscriptionsSvc = inject(SubscriptionsService);
+  private toasts = inject(ToastService);
+  private batchUrls = inject(BatchUrlsService);
   private socket = inject(MeTubeSocket);
   private cookieService = inject(CookieService);
   private http = inject(HttpClient);
@@ -415,7 +420,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
           const date = new Date(data['update_time'] * 1000);
           this.ytDlpOptionsUpdateTime=date.toLocaleString();
         }else{
-          alert("Error reload yt-dlp options: "+data['msg']);
+          this.toasts.error("Error reloading yt-dlp options: " + data['msg']);
         }
         this.cdr.markForCheck();
       }
@@ -490,11 +495,11 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     try {
       const parsed = JSON.parse(trimmed);
       if (!parsed || Array.isArray(parsed) || typeof parsed !== 'object') {
-        alert('Custom yt-dlp options must be a JSON object');
+        this.toasts.error('Custom yt-dlp options must be a JSON object');
         return false;
       }
     } catch {
-      alert('Custom yt-dlp options must be valid JSON');
+      this.toasts.error('Custom yt-dlp options must be valid JSON');
       return false;
     }
     return true;
@@ -525,7 +530,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     this.subscriptionsSvc.refreshList().pipe(takeUntilDestroyed(this.destroyRef)).subscribe((refreshRes) => {
       const error = this.getStatusError(refreshRes);
       if (error) {
-        alert(error || 'Refresh subscriptions failed');
+        this.toasts.error(error || 'Refresh subscriptions failed');
         return;
       }
       this.cdr.markForCheck();
@@ -569,7 +574,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     }
     const payload = this.buildAddPayload();
     if (!payload.url?.trim()) {
-      alert('Please enter a URL');
+      this.toasts.error('Please enter a URL');
       return;
     }
     const tr = (this.titleRegex || '').trim();
@@ -577,12 +582,12 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       try {
         void RegExp(tr);
       } catch {
-        alert('Invalid subscription title filter (regex)');
+        this.toasts.error('Invalid subscription title filter (regex)');
         return;
       }
     }
     if (payload.splitByChapters && !payload.chapterTemplate.includes('%(section_number)')) {
-      alert('Chapter template must include %(section_number)');
+      this.toasts.error('Chapter template must include %(section_number)');
       return;
     }
     if (!this.validateYtdlOptionsOverrides(payload.ytdlOptionsOverrides)) {
@@ -611,7 +616,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
         next: (res) => {
           const r = res as { status?: string; msg?: string };
           if (r.status === 'error') {
-            alert(r.msg || 'Subscribe failed');
+            this.toasts.error(r.msg || 'Subscribe failed');
           } else {
             this.addUrl = '';
             this.titleRegex = '';
@@ -639,14 +644,14 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       try {
         void RegExp(raw);
       } catch {
-        alert('Invalid subscription title filter (regex)');
+        this.toasts.error('Invalid subscription title filter (regex)');
         return;
       }
     }
     this.subscriptionsSvc.update(id, { title_regex: raw }).subscribe((res) => {
       const error = this.getStatusError(res);
       if (error) {
-        alert(error || 'Update subscription failed');
+        this.toasts.error(error || 'Update subscription failed');
         return;
       }
       this.cancelEditTitleRegex();
@@ -657,7 +662,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     this.subscriptionsSvc.delete([id]).subscribe((res) => {
       const error = this.getStatusError(res);
       if (error) {
-        alert(error || 'Delete subscription failed');
+        this.toasts.error(error || 'Delete subscription failed');
         return;
       }
       this.selectedSubscriptionIds.delete(id);
@@ -673,7 +678,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     this.subscriptionsSvc.delete(ids).subscribe((res) => {
       const error = this.getStatusError(res);
       if (error) {
-        alert(error || 'Delete subscriptions failed');
+        this.toasts.error(error || 'Delete subscriptions failed');
         return;
       }
       this.selectedSubscriptionIds.clear();
@@ -699,7 +704,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       .subscribe((res) => {
         const error = this.getStatusError(res);
         if (error) {
-          alert(error || 'Subscription check failed');
+          this.toasts.error(error || 'Subscription check failed');
           return;
         }
         this.refreshSubscriptionsWithAlert();
@@ -746,7 +751,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       .subscribe((res) => {
         const error = this.getStatusError(res);
         if (error) {
-          alert(error || 'Subscription check failed');
+          this.toasts.error(error || 'Subscription check failed');
           return;
         }
         this.refreshSubscriptionsWithAlert();
@@ -769,7 +774,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     this.subscriptionsSvc.update(row.id, { enabled: !row.enabled }).subscribe((res) => {
       const error = this.getStatusError(res);
       if (error) {
-        alert(error || 'Update subscription failed');
+        this.toasts.error(error || 'Update subscription failed');
       }
     });
   }
@@ -1066,20 +1071,19 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
 
     // Validate chapter template if chapter splitting is enabled
     if (payload.splitByChapters && !payload.chapterTemplate.includes('%(section_number)')) {
-      alert('Chapter template must include %(section_number)');
+      this.toasts.error('Chapter template must include %(section_number)');
       return;
     }
     if (!this.validateYtdlOptionsOverrides(payload.ytdlOptionsOverrides)) {
       return;
     }
 
-    console.debug('Downloading:', payload);
     this.addInProgress = true;
     this.cancelRequested = false;
     this.addRequestSub?.unsubscribe();
     this.addRequestSub = this.downloads.add(payload).subscribe((status: Status) => {
       if (status.status === 'error' && !this.cancelRequested) {
-        alert(`Error adding URL: ${status.msg}`);
+        this.toasts.error(`Error adding URL: ${status.msg}`);
       } else if (status.status !== 'error') {
         this.addUrl = '';
       }
@@ -1185,10 +1189,22 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     });
   }
 
-  downloadSelectedFiles() {
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    this.downloads.done.forEach((dl, _) => {
+  // Chromium-based browsers silently drop programmatic downloads beyond ~10 when
+  // triggered in a tight loop. Trigger in batches with a short pause in between so
+  // large selections download cleanly. See issue #1008.
+  private static readonly DOWNLOAD_BATCH_SIZE = 10;
+  private static readonly DOWNLOAD_BATCH_DELAY_MS = 1000;
+
+  async downloadSelectedFiles() {
+    const selected: Download[] = [];
+    this.downloads.done.forEach((dl) => {
       if (dl.status === 'finished' && dl.checked) {
+        selected.push(dl);
+      }
+    });
+
+    for (let i = 0; i < selected.length; i++) {
+      const dl = selected[i];
       const link = document.createElement('a');
       link.href = this.buildDownloadLink(dl);
       link.setAttribute('download', dl.filename);
@@ -1196,8 +1212,16 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       document.body.appendChild(link);
       link.click();
       document.body.removeChild(link);
+
+      if (
+        (i + 1) % App.DOWNLOAD_BATCH_SIZE === 0 &&
+        i + 1 < selected.length
+      ) {
+        await new Promise((resolve) =>
+          setTimeout(resolve, App.DOWNLOAD_BATCH_DELAY_MS),
+        );
+      }
     }
-    });
   }
 
   buildDownloadLink(download: Download) {
@@ -1241,10 +1265,12 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     // file into memory only to have navigator.canShare reject it.
     if (download.size && download.size > App.SHARE_SIZE_WARN_BYTES) {
       const sizeMb = Math.round(download.size / 1024 / 1024);
-      const proceed = window.confirm(
+      const proceed = await this.toasts.confirm(
         `This file is ${sizeMb} MB. iOS' share sheet often refuses files ` +
         `larger than ~100 MB and the share will silently fail. ` +
-        `Try anyway? (Use the download button instead if it fails.)`
+        `Try anyway? (Use the download button instead if it fails.)`,
+        'Try anyway',
+        'Cancel',
       );
       if (!proceed) return;
     }
@@ -1265,7 +1291,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
         // download button right next to this one instead of staring at
         // a button that quietly did nothing.
         console.warn('navigator.canShare rejected payload for', download.filename);
-        window.alert(
+        this.toasts.error(
           `Your device's share sheet doesn't accept this file ` +
           `(most likely because it's too large). ` +
           `Please use the download button instead.`
@@ -1278,7 +1304,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       // AbortError = user dismissed the share sheet → silent no-op.
       if (e.name === 'AbortError') return;
       console.error('Share failed:', err);
-      window.alert(
+      this.toasts.error(
         `Share failed: ${e.message || 'unknown error'}. ` +
         `Please use the download button instead.`
       );
@@ -1370,7 +1396,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       .map(url => url.trim())
       .filter(url => url.length > 0);
     if (urls.length === 0) {
-      alert('No valid URLs found.');
+      this.toasts.error('No valid URLs found.');
       return;
     }
     this.importInProgress = true;
@@ -1435,62 +1461,13 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
   }
 
   // Export URLs based on filter: 'pending', 'completed', 'failed', or 'all'
-  exportBatchUrls(filter: 'pending' | 'completed' | 'failed' | 'all'): void {
-    let urls: string[];
-    if (filter === 'pending') {
-      urls = Array.from(this.downloads.queue.values()).map(dl => dl.url);
-    } else if (filter === 'completed') {
-      // Only finished downloads in the "done" Map
-      urls = Array.from(this.downloads.done.values()).filter(dl => dl.status === 'finished').map(dl => dl.url);
-    } else if (filter === 'failed') {
-      // Only error downloads from the "done" Map
-      urls = Array.from(this.downloads.done.values()).filter(dl => dl.status === 'error').map(dl => dl.url);
-    } else {
-      // All: pending + both finished and error in done
-      urls = [
-        ...Array.from(this.downloads.queue.values()).map(dl => dl.url),
-        ...Array.from(this.downloads.done.values()).map(dl => dl.url)
-      ];
-    }
-    if (!urls.length) {
-      alert('No URLs found for the selected filter.');
-      return;
-    }
-    const content = urls.join('\n');
-    const blob = new Blob([content], { type: 'text/plain' });
-    const downloadUrl = window.URL.createObjectURL(blob);
-    const a = document.createElement('a');
-    a.href = downloadUrl;
-    a.download = 'metube_urls.txt';
-    document.body.appendChild(a);
-    a.click();
-    document.body.removeChild(a);
-    window.URL.revokeObjectURL(downloadUrl);
+  exportBatchUrls(filter: BatchUrlFilter): void {
+    this.batchUrls.export(filter);
   }
 
   // Copy URLs to clipboard based on filter: 'pending', 'completed', 'failed', or 'all'
-  copyBatchUrls(filter: 'pending' | 'completed' | 'failed' | 'all'): void {
-    let urls: string[];
-    if (filter === 'pending') {
-      urls = Array.from(this.downloads.queue.values()).map(dl => dl.url);
-    } else if (filter === 'completed') {
-      urls = Array.from(this.downloads.done.values()).filter(dl => dl.status === 'finished').map(dl => dl.url);
-    } else if (filter === 'failed') {
-      urls = Array.from(this.downloads.done.values()).filter(dl => dl.status === 'error').map(dl => dl.url);
-    } else {
-      urls = [
-        ...Array.from(this.downloads.queue.values()).map(dl => dl.url),
-        ...Array.from(this.downloads.done.values()).map(dl => dl.url)
-      ];
-    }
-    if (!urls.length) {
-      alert('No URLs found for the selected filter.');
-      return;
-    }
-    const content = urls.join('\n');
-    navigator.clipboard.writeText(content)
-      .then(() => alert('URLs copied to clipboard.'))
-      .catch(() => alert('Failed to copy URLs.'));
+  copyBatchUrls(filter: BatchUrlFilter): void {
+    this.batchUrls.copy(filter);
   }
 
   fetchVersionInfo(): void {
@@ -1550,7 +1527,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     };
     const fail = (err?: unknown) => {
       console.error('Clipboard write failed:', err);
-      alert('Failed to copy to clipboard. Your browser may require HTTPS for clipboard access.');
+      this.toasts.error('Failed to copy to clipboard. Your browser may require HTTPS for clipboard access.');
     };
     if (navigator.clipboard?.writeText) {
       navigator.clipboard.writeText(text).then(done).catch(fail);
@@ -1586,7 +1563,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
           this.hasCookies = true;
         } else {
           this.refreshCookieStatus();
-          alert(`Error uploading cookies: ${this.formatErrorMessage(response?.msg)}`);
+          this.toasts.error(`Error uploading cookies: ${this.formatErrorMessage(response?.msg)}`);
         }
         this.cookieUploadInProgress = false;
         input.value = '';
@@ -1595,7 +1572,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
         this.refreshCookieStatus();
         this.cookieUploadInProgress = false;
         input.value = '';
-        alert('Error uploading cookies.');
+        this.toasts.error('Error uploading cookies.');
       }
     });
   }
@@ -1629,11 +1606,11 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
           return;
         }
         this.refreshCookieStatus();
-        alert(`Error deleting cookies: ${this.formatErrorMessage(response?.msg)}`);
+        this.toasts.error(`Error deleting cookies: ${this.formatErrorMessage(response?.msg)}`);
       },
       error: () => {
         this.refreshCookieStatus();
-        alert('Error deleting cookies.');
+        this.toasts.error('Error deleting cookies.');
       }
     });
   }

ui/src/app/components/index.ts

@@ -1,2 +1,3 @@
 export { SelectAllCheckboxComponent } from './master-checkbox.component';
 export { ItemCheckboxComponent } from './slave-checkbox.component';
+export { ToastContainerComponent } from './toast-container.component';

ui/src/app/components/toast-container.component.ts

@@ -0,0 +1,58 @@
+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { FontAwesomeModule } from '@fortawesome/angular-fontawesome';
+import { faCheckCircle, faTimesCircle, faInfoCircle, faXmark } from '@fortawesome/free-solid-svg-icons';
+import { ToastService } from '../services/toast.service';
+
+@Component({
+  selector: 'app-toast-container',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [FontAwesomeModule],
+  template: `
+<div class="toast-container position-fixed top-0 end-0 p-3" style="z-index: 1100;" aria-live="polite" aria-atomic="true">
+  @for (toast of toasts.toasts(); track toast.id) {
+    <div class="toast show align-items-center border-0 mb-2"
+      [class.text-bg-danger]="toast.level === 'error'"
+      [class.text-bg-success]="toast.level === 'success'"
+      [class.text-bg-primary]="toast.level === 'info'"
+      role="alert" aria-live="assertive" aria-atomic="true">
+      <div class="d-flex">
+        <div class="toast-body d-flex align-items-start gap-2">
+          @if (toast.level === 'error') {
+            <fa-icon [icon]="faTimesCircle" class="mt-1" />
+          } @else if (toast.level === 'success') {
+            <fa-icon [icon]="faCheckCircle" class="mt-1" />
+          } @else {
+            <fa-icon [icon]="faInfoCircle" class="mt-1" />
+          }
+          <span style="white-space: pre-line;">{{ toast.message }}</span>
+        </div>
+        @if (!toast.actions) {
+          <button type="button" class="btn-close btn-close-white me-2 m-auto"
+            aria-label="Close" (click)="toasts.dismiss(toast.id)"></button>
+        }
+      </div>
+      @if (toast.actions) {
+        <div class="d-flex justify-content-end gap-2 px-3 pb-2">
+          @for (action of toast.actions; track action.label) {
+            <button type="button"
+              class="btn btn-sm"
+              [class.btn-light]="!action.primary"
+              [class.btn-outline-light]="action.primary"
+              (click)="toasts.respond(toast.id, action.value)">
+              {{ action.label }}
+            </button>
+          }
+        </div>
+      }
+    </div>
+  }
+</div>
+`,
+})
+export class ToastContainerComponent {
+  protected readonly toasts = inject(ToastService);
+  protected readonly faCheckCircle = faCheckCircle;
+  protected readonly faTimesCircle = faTimesCircle;
+  protected readonly faInfoCircle = faInfoCircle;
+  protected readonly faXmark = faXmark;
+}

ui/src/app/services/batch-urls.service.ts

@@ -0,0 +1,62 @@
+import { inject, Injectable } from '@angular/core';
+import { DownloadsService } from './downloads.service';
+import { ToastService } from './toast.service';
+
+export type BatchUrlFilter = 'pending' | 'completed' | 'failed' | 'all';
+
+/**
+ * Encapsulates collecting download URLs by status and exporting/copying them.
+ * Extracted from the main app component to keep it focused on view concerns.
+ */
+@Injectable({ providedIn: 'root' })
+export class BatchUrlsService {
+  private downloads = inject(DownloadsService);
+  private toasts = inject(ToastService);
+
+  collect(filter: BatchUrlFilter): string[] {
+    const queueUrls = () => Array.from(this.downloads.queue.values()).map((dl) => dl.url);
+    const doneUrls = (status?: string) =>
+      Array.from(this.downloads.done.values())
+        .filter((dl) => status === undefined || dl.status === status)
+        .map((dl) => dl.url);
+    switch (filter) {
+      case 'pending':
+        return queueUrls();
+      case 'completed':
+        return doneUrls('finished');
+      case 'failed':
+        return doneUrls('error');
+      default:
+        return [...queueUrls(), ...doneUrls()];
+    }
+  }
+
+  export(filter: BatchUrlFilter): void {
+    const urls = this.collect(filter);
+    if (!urls.length) {
+      this.toasts.info('No URLs found for the selected filter.');
+      return;
+    }
+    const blob = new Blob([urls.join('\n')], { type: 'text/plain' });
+    const downloadUrl = window.URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = downloadUrl;
+    a.download = 'metube_urls.txt';
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    window.URL.revokeObjectURL(downloadUrl);
+  }
+
+  copy(filter: BatchUrlFilter): void {
+    const urls = this.collect(filter);
+    if (!urls.length) {
+      this.toasts.info('No URLs found for the selected filter.');
+      return;
+    }
+    navigator.clipboard
+      .writeText(urls.join('\n'))
+      .then(() => this.toasts.success('URLs copied to clipboard.'))
+      .catch(() => this.toasts.error('Failed to copy URLs.'));
+  }
+}

ui/src/app/services/index.ts

@@ -1,2 +1,4 @@
 export { DownloadsService } from './downloads.service';
 export { MeTubeSocket } from './metube-socket.service';
+export { ToastService } from './toast.service';
+export { BatchUrlsService } from './batch-urls.service';

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

@@ -0,0 +1,86 @@
+import { Injectable, signal } from '@angular/core';
+
+export type ToastLevel = 'info' | 'success' | 'error';
+
+export interface ToastAction {
+  label: string;
+  value: boolean;
+  primary?: boolean;
+}
+
+export interface Toast {
+  id: number;
+  level: ToastLevel;
+  message: string;
+  actions?: ToastAction[];
+  /** Resolver for confirm() toasts; resolved when the user picks an action or dismisses. */
+  _resolve?: (value: boolean) => void;
+}
+
+/**
+ * Lightweight non-blocking notification service. Replaces the blocking
+ * window.alert()/confirm() dialogs that previously littered the app component.
+ */
+@Injectable({ providedIn: 'root' })
+export class ToastService {
+  private counter = 0;
+  readonly toasts = signal<Toast[]>([]);
+
+  info(message: string): void {
+    this.show('info', message, 4000);
+  }
+
+  success(message: string): void {
+    this.show('success', message, 4000);
+  }
+
+  error(message: string): void {
+    this.show('error', message, 8000);
+  }
+
+  /**
+   * Show a confirmation toast with confirm/cancel actions. Resolves true when
+   * confirmed, false when cancelled or auto-dismissed.
+   */
+  confirm(message: string, confirmLabel = 'OK', cancelLabel = 'Cancel'): Promise<boolean> {
+    return new Promise<boolean>((resolve) => {
+      const id = ++this.counter;
+      this.toasts.update((list) => [
+        ...list,
+        {
+          id,
+          level: 'info',
+          message,
+          actions: [
+            { label: cancelLabel, value: false },
+            { label: confirmLabel, value: true, primary: true },
+          ],
+          _resolve: resolve,
+        },
+      ]);
+    });
+  }
+
+  respond(id: number, value: boolean): void {
+    const toast = this.toasts().find((t) => t.id === id);
+    toast?._resolve?.(value);
+    this.remove(id);
+  }
+
+  dismiss(id: number): void {
+    const toast = this.toasts().find((t) => t.id === id);
+    // A confirm toast dismissed without an explicit choice resolves to false.
+    toast?._resolve?.(false);
+    this.remove(id);
+  }
+
+  private remove(id: number): void {
+    this.toasts.update((list) => list.filter((t) => t.id !== id));
+  }
+
+  private show(level: ToastLevel, message: string, autoDismissMs: number): void {
+    const id = ++this.counter;
+    this.toasts.update((list) => [...list, { id, level, message }]);
+    setTimeout(() => this.remove(id), autoDismissMs);
+  }
+}

uv.lock

@@ -106,14 +106,14 @@ wheels = [
 
 [[package]]
 name = "anyio"
-version = "4.13.0"
+version = "4.14.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "idna" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/19/14/2c5dd9f512b66549ae92767a9c7b330ae88e1932ca57876909410251fe13/anyio-4.13.0.tar.gz", hash = "sha256:334b70e641fd2221c1505b3890c69882fe4a2df910cba14d97019b90b24439dc", size = 231622, upload-time = "2026-03-24T12:59:09.671Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/1c/b5/001890774a9552aff22502b8da382593109ce0c95314abaebbb116567545/anyio-4.14.0.tar.gz", hash = "sha256:b47c1f9ccf73e67021df785332508f99379c68fa7d0684e8e3492cb1d4b23f89", size = 253586, upload-time = "2026-06-15T22:00:49.021Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/da/42/e921fccf5015463e32a3cf6ee7f980a6ed0f395ceeaa45060b61d86486c2/anyio-4.13.0-py3-none-any.whl", hash = "sha256:08b310f9e24a9594186fd75b4f73f4a4152069e3853f1ed8bfbf58369f4ad708", size = 114353, upload-time = "2026-03-24T12:59:08.246Z" },
+    { url = "https://files.pythonhosted.org/packages/ba/16/9826f089383c593cdfc4a6e5aca94d9e91ae1692c57af82c3b2aa5e810f7/anyio-4.14.0-py3-none-any.whl", hash = "sha256:dd9b7a2a9799ed6552fde617b2c5df02b7fdd7d88392fc48101e51bae46164d9", size = 123506, upload-time = "2026-06-15T22:00:47.595Z" },
 ]
 
 [[package]]
@@ -789,7 +789,7 @@ wheels = [
 
 [[package]]
 name = "pylint"
-version = "4.0.5"
+version = "4.0.6"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "astroid" },
@@ -800,14 +800,14 @@ dependencies = [
     { name = "platformdirs" },
     { name = "tomlkit" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e4/b6/74d9a8a68b8067efce8d07707fe6a236324ee1e7808d2eb3646ec8517c7d/pylint-4.0.5.tar.gz", hash = "sha256:8cd6a618df75deb013bd7eb98327a95f02a6fb839205a6bbf5456ef96afb317c", size = 1572474, upload-time = "2026-02-20T09:07:33.621Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7d/1d/3bb57f303701549550d74bf7ced2b07412be97125c167a0c9d216aa9f762/pylint-4.0.6.tar.gz", hash = "sha256:52f19191bee08bf103f9705ad1a0ece4aa5a0a4ef2bdcbd969375a1e6f6579d5", size = 1585588, upload-time = "2026-06-14T14:43:26.772Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/d5/6f/9ac2548e290764781f9e7e2aaf0685b086379dabfb29ca38536985471eaf/pylint-4.0.5-py3-none-any.whl", hash = "sha256:00f51c9b14a3b3ae08cff6b2cdd43f28165c78b165b628692e428fb1f8dc2cf2", size = 536694, upload-time = "2026-02-20T09:07:31.028Z" },
+    { url = "https://files.pythonhosted.org/packages/ab/da/acb2e7d4dbd2dfb792d38c0d850481f29ad7049b356d23f56c687d35203b/pylint-4.0.6-py3-none-any.whl", hash = "sha256:d11a0e1fdb7b1cd46ec5d6fc78fee8b95f28695b2d6140e5809925f61e32ea54", size = 538389, upload-time = "2026-06-14T14:43:24.873Z" },
 ]
 
 [[package]]
 name = "pytest"
-version = "9.0.3"
+version = "9.1.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -816,9 +816,9 @@ dependencies = [
     { name = "pluggy" },
     { name = "pygments" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/84/0e/b5858858d74958632c49b72cb25a3976ff9f632397626715be71c89d3971/pytest-9.1.0.tar.gz", hash = "sha256:41dd9148c08072446394cefd3d79701701335a9f4cae69ba92e39f6c7f5c061c", size = 1634181, upload-time = "2026-06-13T18:52:45.983Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/d4/24/a372aaf5c9b7208e7112038812994107bc65a84cd00e0354a88c2c77a617/pytest-9.0.3-py3-none-any.whl", hash = "sha256:2c5efc453d45394fdd706ade797c0a81091eccd1d6e4bccfcd476e2b8e0ab5d9", size = 375249, upload-time = "2026-04-07T17:16:16.13Z" },
+    { url = "https://files.pythonhosted.org/packages/8b/5a/ba30a81239b909821b3153e303e7def45178bf353da4f72380e6c5e8793b/pytest-9.1.0-py3-none-any.whl", hash = "sha256:8ebb0e7888bdf2bdfc602ec51f8f62d50200af37356c74e503c79a94f5c81f32", size = 386453, upload-time = "2026-06-13T18:52:44.045Z" },
 ]
 
 [[package]]
@@ -861,15 +861,15 @@ wheels = [
 
 [[package]]
 name = "python-socketio"
-version = "5.16.2"
+version = "5.16.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "bidict" },
     { name = "python-engineio" },
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