feat: 在线取清单改为不走 DHT — 优先 torrent 缓存服务(HTTPS)，回退 webtorrent 仅 http/wss tracker
This commit is contained in:
ice-a
@@ -48,7 +48,7 @@ async function logout() {
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<div class="topbar-right">
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<span class="pill hide-sm" :class="health && !health.webTorrent ? 'warn' : ''">
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<i class="dot" />
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{{ health?.webTorrent ? '磁力解析就绪' : '磁力解析不可用' }}
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{{ health?.webTorrent ? '磁力解析就绪' : '磁力解析（缓存模式）' }}
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</span>
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<NuxtLink to="/settings" class="pill" :class="mongoPill.cls">
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<i class="dot" />
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@@ -323,8 +323,8 @@ onMounted(load)
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<span :class="health?.mongo.ok ? 'ok' : 'err'">{{ health?.mongo.ok ? '已连接' : '未连接' }}</span>
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</dd>
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<dt>磁力解析</dt>
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<dd :class="health?.webTorrent ? 'ok' : 'err'">
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{{ health?.webTorrent ? 'webtorrent 可用，可通过 DHT/tracker 取文件清单' : 'webtorrent 不可用，磁力链只能显示 infoHash' }}
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<dd :class="health?.webTorrent ? 'ok' : 'warn'">
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{{ health?.webTorrent ? 'webtorrent 可用，可通过 DHT/tracker 取文件清单' : 'webtorrent 不可用，但通过 torrent 缓存服务在线取清单（不走 DHT）' }}
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</dd>
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<dt>搜索源</dt>
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<dd class="mono small">{{ health?.providers?.map((p) => p.label).join(' / ') }}</dd>
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@@ -10,7 +10,7 @@ export const zh2en: Record<string, string> = {
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'设置': 'Settings',
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'MONGO 未连接': 'MONGO disconnected',
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'磁力解析就绪': 'Magnet parsing ready',
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'磁力解析不可用': 'Magnet parsing unavailable',
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'磁力解析（缓存模式）': 'Magnet parsing (cache mode)',
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'本地自托管 · 单进程 Nuxt 单体应用': 'Self-hosted · single-process Nuxt app',
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'种子只做解析与预览，文件内容由你自己的下载器拉取': 'Torrents are only parsed and previewed; file contents are fetched by your own download client',
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@@ -215,7 +215,7 @@ export const zh2en: Record<string, string> = {
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'已连接': 'Connected',
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'磁力解析': 'Magnet parsing',
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'webtorrent 可用，可通过 DHT/tracker 取文件清单': 'webtorrent available; can fetch file list via DHT/tracker',
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'webtorrent 不可用，磁力链只能显示 infoHash': 'webtorrent unavailable; magnet links can only show infoHash',
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'webtorrent 不可用，但通过 torrent 缓存服务在线取清单（不走 DHT）': 'webtorrent unavailable, but online file list via torrent cache (no DHT)',
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// ===== 输入框占位符 =====
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'输入片名 / 剧名 / 关键词，回车搜索': 'Movie / show / keyword, press Enter to search',
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+67
-16
@@ -58,6 +58,24 @@ export function withDefaultTrackers(magnet: string, extra: string[] = []): strin
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return magnet + list.map((t) => `&tr=${encodeURIComponent(t)}`).join('')
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}
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/** 仅 HTTP/HTTPS/WebSocket 的 tracker（不走 UDP/DHT，Serverless 环境也能出网） */
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export const HTTP_TRACKERS = [
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'wss://tracker.openwebtorrent.com',
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'wss://tracker.btorrent.xyz',
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'http://tracker.opentrackr.org/announce',
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'http://open.acgnloader.live:8484/announce',
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'https://tracker.nanocodes.net/announce'
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]
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/** 给磁力链补上 HTTP/WS tracker（不补 UDP，避免 DHT） */
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export function withHttpTrackers(magnet: string): string {
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const existing = new Set(trackersInMagnet(magnet))
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const add = HTTP_TRACKERS.filter((t) => !existing.has(t))
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if (!add.length) return magnet
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const sep = magnet.includes('?') ? '&' : '?'
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return magnet + sep + add.map((t) => `tr=${encodeURIComponent(t)}`).join('&')
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}
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function toInfoHash(value: unknown): string {
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if (!value) return ''
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if (typeof value === 'string') return value.toLowerCase()
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@@ -188,27 +206,62 @@ export async function checkWebTorrent(): Promise<boolean> {
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}
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}
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function extractInfoHash(magnet: string): string {
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const m = magnet.match(/xt=urn:btih:([a-z0-9]+)/i)
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return m ? m[1].toLowerCase() : ''
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}
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/** 通过公开的 torrent 缓存服务取 .torrent（纯 HTTPS，无需 P2P，Vercel 等 Serverless 可用） */
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const TORRENT_CACHES: ((ih: string) => string)[] = [
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(ih) => `https://itorrents.org/torrent/${ih}.torrent`,
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(ih) => `https://torcache.net/torrent/${ih}.torrent`,
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(ih) => `https://thetorrent.org/${ih}`,
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(ih) => `https://btcache.me/torrent/${ih}/download`
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]
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async function fetchFromCache(infoHash: string): Promise<{ name: string; files: TorrentFileEntry[]; size: number } | null> {
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if (!infoHash) return null
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const results = await Promise.allSettled(
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TORRENT_CACHES.map(async (fn) => {
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const res = await fetch(fn(infoHash), { redirect: 'follow', signal: AbortSignal.timeout(8000) })
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if (!res.ok) throw new Error(`status ${res.status}`)
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const buf = Buffer.from(await res.arrayBuffer())
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const info = await parseTorrentBuffer(buf)
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if (!info.files?.length) throw new Error('no files')
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return { name: info.name, files: info.files, size: info.size }
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})
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)
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for (const r of results) if (r.status === 'fulfilled') return r.value
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return null
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}
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/**
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* 通过磁力链从 DHT / tracker 拉取种子元数据，从而得到文件清单。
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* 只取元数据，取到后立刻销毁客户端并清理临时目录。
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* 在线获取种子元数据（文件清单）。
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* 优先走 torrent 缓存服务（纯 HTTPS，Vercel 等 Serverless 可用，无需 P2P）；
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* 缓存未命中时再尝试 webtorrent，但关闭 DHT、仅用 http/wss tracker（需支持 TCP/TLS 的 Node 运行时）。
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*/
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export async function fetchMetadataFromMagnet(
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magnetUri: string,
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timeoutMs = 30000
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): Promise<{ name: string; files: TorrentFileEntry[]; size: number }> {
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const infoHash = extractInfoHash(magnetUri)
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// 1) torrent 缓存服务（并发尝试，取第一个成功）
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const cached = await fetchFromCache(infoHash)
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if (cached) return cached
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// 2) webtorrent：关闭 DHT，仅 http/wss tracker
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try {
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const WebTorrent = await loadWebTorrent()
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const dir = join(tmpdir(), `dsl-meta-${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 8)}`)
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await mkdir(dir, { recursive: true })
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const client = new WebTorrent({ dht: true, lsd: false, utp: false })
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const client = new WebTorrent({ dht: false, lsd: false, utp: false })
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try {
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// 纯 DHT 很可能找不到节点，没 tracker 的磁力链先补上公共 tracker
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const torrent = client.add(withDefaultTrackers(magnetUri), { path: dir })
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const torrent = client.add(withHttpTrackers(magnetUri), { path: dir })
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torrent.on('warning', () => {})
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await new Promise<void>((resolve, reject) => {
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const timer = setTimeout(() => {
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reject(new Error(`获取种子元数据超时（${Math.round(timeoutMs / 1000)}s），可能没有可用节点或 tracker 被墙`))
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reject(new Error(`获取种子元数据超时（${Math.round(timeoutMs / 1000)}s），可能缺少可用的 HTTP/WS tracker`))
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}, timeoutMs)
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const done = (fn: () => void) => {
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clearTimeout(timer)
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@@ -219,24 +272,22 @@ export async function fetchMetadataFromMagnet(
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torrent.on('error', (err: Error) => done(() => reject(err)))
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client.on('error', (err: Error) => done(() => reject(err)))
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})
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const files: TorrentFileEntry[] = (torrent.files || []).map((f: any) => ({
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// Windows 下 webtorrent 用反斜杠拼路径，统一成正斜杠便于展示
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path: String(f.path || f.name || '').replace(/\\/g, '/'),
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length: Number(f.length) || 0
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}))
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return {
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name: String(torrent.name || ''),
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files,
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size: files.reduce((sum, f) => sum + f.length, 0)
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}
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return { name: String(torrent.name || ''), files, size: files.reduce((sum, f) => sum + f.length, 0) }
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} finally {
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try {
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// webtorrent v3 的 destroy 是回调式 API
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await new Promise<void>((resolve) => client.destroy(() => resolve()))
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} catch {
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/* ignore */
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}
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rm(dir, { recursive: true, force: true }).catch(() => {})
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}
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} catch {
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// webtorrent 在当前环境不可用（例如 Vercel 无法加载原生模块），忽略，继续降级
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}
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throw new Error('无法通过在线方式获取种子元数据：缓存服务未命中，且当前环境不支持 webtorrent（DHT 已禁用，仅 HTTP/WS tracker）。仅显示 infoHash')
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}
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