Add TorrentDownloadPlugin

.gitignore

@@ -51,3 +51,4 @@ templates
 /gameyfin/src/main/frontend/**/*.js
 /gameyfin/src/main/frontend/**/*.js.map
 /gameyfin/src/main/bundles/
+/torrent_dotfiles/

plugins/torrentdownload/build.gradle.kts

@@ -0,0 +1,23 @@
+plugins {
+    id("com.google.devtools.ksp")
+}
+
+repositories {
+    maven { setUrl("https://jitpack.io") }
+    maven { setUrl("https://repository.jboss.org") }
+}
+
+dependencies {
+
+    ksp("care.better.pf4j:pf4j-kotlin-symbol-processing:${rootProject.extra["pf4jKspVersion"]}")
+
+    // Torrent tracker & seeder
+    implementation("com.github.mpetazzoni:ttorrent:ttorrent-2.0") {
+        exclude(group = "org.slf4j")
+    }
+
+    // Torrent file builder
+    implementation("com.github.atomashpolskiy:bt-core:1.10") {
+        exclude(group = "org.slf4j")
+    }
+}

plugins/torrentdownload/src/main/kotlin/de/grimsi/gameyfinplugins/torrentdownload/TorrentDownloadPlugin.kt

@@ -0,0 +1,205 @@
+package de.grimsi.gameyfinplugins.torrentdownload
+
+import bt.torrent.maker.TorrentBuilder
+import com.turn.ttorrent.client.CommunicationManager
+import com.turn.ttorrent.client.SelectorFactoryImpl
+import com.turn.ttorrent.client.storage.FullyPieceStorageFactory
+import com.turn.ttorrent.network.FirstAvailableChannel
+import com.turn.ttorrent.tracker.TrackedTorrent
+import com.turn.ttorrent.tracker.Tracker
+import de.grimsi.gameyfin.pluginapi.core.config.ConfigMetadata
+import de.grimsi.gameyfin.pluginapi.core.config.PluginConfigMetadata
+import de.grimsi.gameyfin.pluginapi.core.config.PluginConfigValidationResult
+import de.grimsi.gameyfin.pluginapi.core.wrapper.ConfigurableGameyfinPlugin
+import de.grimsi.gameyfin.pluginapi.download.Download
+import de.grimsi.gameyfin.pluginapi.download.DownloadProvider
+import de.grimsi.gameyfin.pluginapi.download.FileDownload
+import org.pf4j.Extension
+import org.pf4j.PluginWrapper
+import java.net.InetAddress
+import java.net.URI
+import java.nio.file.Files
+import java.nio.file.Path
+import java.util.concurrent.Executors
+import kotlin.io.path.*
+
+class TorrentDownloadPlugin(wrapper: PluginWrapper) : ConfigurableGameyfinPlugin(wrapper) {
+
+    companion object {
+        private val TORRENT_FILE_DIRECTORY = Path.of("torrent_dotfiles")
+        private lateinit var tracker: Tracker
+        private lateinit var communicationManager: CommunicationManager
+
+        private lateinit var plugin: TorrentDownloadPlugin
+    }
+
+    init {
+        plugin = this
+    }
+
+    override val configMetadata: PluginConfigMetadata = listOf(
+        ConfigMetadata(
+            key = "trackerPort",
+            label = "Tracker Port",
+            description = "Which port the torrent tracker should use",
+            type = Int::class.java,
+            default = 6969
+        ),
+        ConfigMetadata(
+            key = "clientPort",
+            label = "Seed Client Port",
+            description = "Which port the seed client should use",
+            type = Int::class.java,
+            default = 6881
+        ),
+        ConfigMetadata(
+            key = "externalHost",
+            label = "Hostname/IP override",
+            description = "Overrides the external host (e.g., if behind NAT)",
+            type = String::class.java,
+            isRequired = false
+        ),
+        ConfigMetadata(
+            key = "trackerSsl",
+            label = "Use SSL for tracker",
+            description = "Enables use of SSL for the torrent tracker",
+            type = Boolean::class.java,
+            default = false
+        ),
+        ConfigMetadata(
+            key = "privateMode",
+            label = "Create torrents with private mode enabled",
+            description = "Enables private mode for the torrent tracker according to BEP-27",
+            type = Boolean::class.java,
+            default = true
+        )
+    )
+
+    @OptIn(ExperimentalPathApi::class)
+    override fun start() {
+        // Currently Gameyfin does not support storing plugin state
+        // and since we can't associate the torrent files with a game path after a restart
+        // we just delete the directory on startup.
+        if (Files.exists(TORRENT_FILE_DIRECTORY)) {
+            TORRENT_FILE_DIRECTORY.deleteRecursively()
+        }
+        Files.createDirectories(TORRENT_FILE_DIRECTORY)
+
+        tracker = Tracker(config("trackerPort"), getTrackerUri().toString())
+        tracker.setAcceptForeignTorrents(false)
+        tracker.start(true)
+
+        val workingExecutor = Executors.newVirtualThreadPerTaskExecutor()
+        val validationExecutor = Executors.newVirtualThreadPerTaskExecutor()
+        val clientPort = config<Int>("clientPort")
+        communicationManager = CommunicationManager(workingExecutor, validationExecutor)
+        communicationManager.start(
+            arrayOf(getHostname()),
+            15,
+            getTrackerUri(),
+            SelectorFactoryImpl(),
+            FirstAvailableChannel(clientPort, clientPort)
+        )
+    }
+
+    override fun stop() {
+        tracker.stop()
+        communicationManager.stop()
+    }
+
+    override fun validateConfig(config: Map<String, String?>): PluginConfigValidationResult {
+        val configValidationResult = super.validateConfig(config)
+        if (!configValidationResult.isValid()) {
+            return configValidationResult
+        }
+
+        val errors = mutableMapOf<String, String>()
+
+        val trackerPort = config["trackerPort"]?.toIntOrNull()
+        if (trackerPort != null && trackerPort !in 1024..49151) {
+            errors["trackerPort"] = "Must be a valid port number between 1024 and 49151."
+        }
+
+        val externalHost = config["externalHost"]
+        if (externalHost != null) {
+            try {
+                InetAddress.getByName(externalHost)
+            } catch (_: Exception) {
+                errors["externalHost"] = "Must be a valid hostname or IP address."
+            }
+        }
+
+        return if (errors.isEmpty()) {
+            PluginConfigValidationResult.VALID
+        } else {
+            PluginConfigValidationResult.INVALID(errors)
+        }
+    }
+
+    private fun getTrackerUri(): URI {
+        val protocol = if (config("trackerSsl")) "https" else "http"
+        val host = getHostname().getCanonicalHostName()
+        val port = config<Int>("trackerPort")
+        val path = "announce"
+
+        return URI.create("$protocol://$host:$port/$path")
+    }
+
+    private fun getHostname(): InetAddress {
+        return InetAddress.getByName(
+            optionalConfig("externalHost") ?: InetAddress.getLocalHost().hostAddress
+        )
+    }
+
+    @Extension
+    class TorrentDownloadProvider : DownloadProvider {
+        override fun download(path: Path): Download {
+            val torrentFile = createTorrentFile(path)
+
+            tracker.announce(TrackedTorrent.load(torrentFile.toFile()))
+            communicationManager.addTorrent(
+                torrentFile.toString(),
+                getRootPath(path).toString(),
+                FullyPieceStorageFactory.INSTANCE
+            )
+
+            return FileDownload(
+                data = torrentFile.inputStream(),
+                fileExtension = "torrent",
+                size = torrentFile.fileSize()
+            )
+        }
+
+        private fun createTorrentFile(gameFilesPath: Path): Path {
+            val torrentFile =
+                TORRENT_FILE_DIRECTORY.resolve("${gameFilesPath.nameWithoutExtension}-${gameFilesPath.hashCode()}.torrent")
+
+            if (Files.exists(torrentFile)) {
+                return torrentFile
+            }
+
+            Files.createFile(torrentFile)
+            Files.write(torrentFile, torrentFileContent(gameFilesPath))
+            return torrentFile
+        }
+
+        private fun torrentFileContent(gameFilesPath: Path): ByteArray {
+            return TorrentBuilder()
+                .numHashingThreads(Runtime.getRuntime().availableProcessors() * 2)
+                .createdBy(plugin.javaClass.name)
+                .addFile(gameFilesPath)
+                .rootPath(getRootPath(gameFilesPath))
+                .announce(plugin.getTrackerUri().toString())
+                .privateFlag(plugin.config("privateMode"))
+                .build()
+        }
+
+        private fun getRootPath(gameFilesPath: Path): Path {
+            return if (gameFilesPath.isDirectory()) {
+                gameFilesPath
+            } else {
+                gameFilesPath.parent
+            }
+        }
+    }
+}

plugins/torrentdownload/src/main/resources/MANIFEST.MF

@@ -0,0 +1,10 @@
+Plugin-Version: 1.0.0-alpha1
+Plugin-Class: de.grimsi.gameyfinplugins.torrentdownload.TorrentDownloadPlugin
+Plugin-Id: de.grimsi.gameyfinplugins.torrentdownload
+Plugin-Name: Torrent Download
+Plugin-Description: Distributes games via a built-in torrent tracker.<br>
+ Users need to install a torrent client to be able to download the games.
+Plugin-Short-Description: Download via Torrent
+Plugin-Author: grimsi, Pfuenzle
+Plugin-License: MIT
+Plugin-Url: https://github.com/gameyfin

plugins/torrentdownload/src/main/resources/logo.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#000000" viewBox="0 0 256 256">
+    <defs>
+        <linearGradient id="grad1" x1="0%" y1="0%" x2="100%" y2="100%">
+            <stop offset="0%" style="stop-color:#2332c8;stop-opacity:1"/>
+            <stop offset="100%" style="stop-color:#6441a5;stop-opacity:1"/>
+        </linearGradient>
+    </defs>
+    <path fill="url(#grad1)"
+          d="M212,96a27.84,27.84,0,0,0-10.51,2L171,59.94A28,28,0,1,0,120,44a28.65,28.65,0,0,0,.15,2.94L73.68,66.3a28,28,0,1,0-28.6,44.83l1.85,46.38a28,28,0,1,0,32.74,41.42L128,212.47a28,28,0,1,0,49.13-18.79l27.21-42.75A28,28,0,1,0,212,96ZM71.19,104.36,113.72,129,72.26,161.22a28,28,0,0,0-9.34-4.35l-1.85-46.38A28,28,0,0,0,71.19,104.36ZM149.57,72a27.8,27.8,0,0,0,8.94-2L189,108.06a27.86,27.86,0,0,0-4.18,9.22l-46.57,2.22ZM82.09,173.85,124,141.26l15.94,47.83a28.2,28.2,0,0,0-7.6,8L84,183.53A28,28,0,0,0,82.09,173.85ZM156,184l-.89,0-16.18-48.53,46.65-2.22a27.94,27.94,0,0,0,5.28,9l-27.21,42.75A28,28,0,0,0,156,184ZM126.32,61.7A28.44,28.44,0,0,0,134,68.24l-11.3,47.45L79.23,90.52A28,28,0,0,0,80,84a28.65,28.65,0,0,0-.15-2.94Z"/>
+</svg>