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// Already locked / in queue\n }\n trackRequestLockMap.set(key, now);\n if (trackRequestLockMap.size > 2000) {\n for (const [k, t] of trackRequestLockMap.entries()) {\n if (now - t > lockWindowMs) trackRequestLockMap.delete(k);\n }\n }\n return true;\n}\n\nconst dashXmlCache = new Map(); // manifestUrl -> { timestamp, xml }\n\nasync function getCachedDashXml(url) {\n if (url.startsWith('data:')) return b64Decode(url.split(',')[1]);\n const cached = dashXmlCache.get(url);\n if (cached && Date.now() - cached.timestamp < 300000) return cached.xml; // 5 min cache\n \n const xmlRes = await fetch(url);\n if (!xmlRes.ok) throw new Error(`Failed to fetch DASH XML: ${xmlRes.status}`);\n const dashXml = await xmlRes.text();\n \n dashXmlCache.set(url, { timestamp: Date.now(), xml: dashXml });\n if (dashXmlCache.size > 500) {\n const now = Date.now();\n for (const [k, v] of dashXmlCache.entries()) {\n if (now - v.timestamp > 300000) dashXmlCache.delete(k);\n }\n }\n return dashXml;\n}\n\nfunction cleanUrlString(str) {\n if (!str) return '';\n return str.trim().replace(/^[\"']|[\"']$/g, '').trim();\n}\n\nlet tidalAccessToken = null;\nlet tidalTokenExpiresAt = 0;\n\nasync function getTidalAccessToken() {\n const clientId = Deno.env.get('TIDAL_CLIENT_ID');\n const clientSecret = Deno.env.get('TIDAL_CLIENT_SECRET');\n if (!clientId || !clientSecret) return null;\n\n if (tidalAccessToken && Date.now() < tidalTokenExpiresAt) {\n return tidalAccessToken;\n }\n\n const credentials = btoa(`${clientId}:${clientSecret}`);\n try {\n const ac = new AbortController();\n const timer = setTimeout(() => ac.abort(), 5000);\n const res = await fetch('https://auth.tidal.com/v1/oauth2/token', {\n method: 'POST',\n headers: {\n 'Authorization': `Basic ${credentials}`,\n 'Content-Type': 'application/x-www-form-urlencoded'\n },\n body: 'grant_type=client_credentials',\n signal: ac.signal\n });\n clearTimeout(timer);\n if (res.ok) {\n const data = await res.json();\n tidalAccessToken = data.access_token;\n tidalTokenExpiresAt = Date.now() + (data.expires_in * 1000) - 60000;\n return tidalAccessToken;\n }\n } catch(e) {}\n return null;\n}\n\nfunction getHifiBackends() {\n const envVal = typeof Deno !== 'undefined' ? (Deno.env.get('HIFI_BACKENDS') || Deno.env.get('HIFI_BACKEND')) : null;\n if (envVal) {\n const list = envVal.split(',').map(s => cleanUrlString(s)).filter(Boolean);\n if (list.length > 0) return list;\n }\n return [];\n}\n\nfunction getHifiSearchBackends() {\n const envVal = typeof Deno !== 'undefined' ? Deno.env.get('HIFI_SEARCH') : null;\n if (envVal) {\n const list = envVal.split(',').map(s => cleanUrlString(s)).filter(Boolean);\n if (list.length > 0) return list;\n }\n return getHifiBackends();\n}\n\nasync function fetchHifiApi(path, options = {}, isSearch = false) {\n const sourceList = isSearch ? getHifiSearchBackends() : getHifiBackends();\n const backends = [...sourceList].sort(() => Math.random() - 0.5);\n if (backends.length === 0) {\n const varName = isSearch ? 'HIFI_SEARCH (or HIFI_BACKENDS)' : 'HIFI_BACKENDS';\n throw new Error(`No HiFi API backends configured. Please set the ${varName} environment variable.`);\n }\n let lastError = null;\n\n for (let base of backends) {\n base = cleanUrlString(base);\n if (!base.startsWith('http')) continue;\n const cleanBase = base.endsWith('/') ? base.slice(0, -1) : base;\n const url = `${cleanBase}${path.startsWith('/') ? path : '/' + path}`;\n const ac = new AbortController();\n const timer = setTimeout(() => ac.abort(), 8000);\n try {\n const res = await fetch(url, { ...options, signal: ac.signal });\n clearTimeout(timer);\n if (res.ok) return res;\n lastError = new Error(`HTTP ${res.status} from ${base}`);\n } catch (e) {\n clearTimeout(timer);\n lastError = e;\n }\n }\n\n throw lastError || new Error('All HiFi API backends failed');\n}\n\nfunction corsHeaders() {\n return {\n 'Access-Control-Allow-Origin': '*',\n 'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',\n 'Access-Control-Allow-Headers': 'Content-Type, Authorization',\n };\n}\n\nfunction jsonResp(data, status = 200, cacheAge = 0) {\n const headers = new Headers(corsHeaders());\n headers.set('Content-Type', 'application/json');\n if (cacheAge > 0) headers.set('Cache-Control', `public, max-age=${cacheAge}`);\n return new Response(JSON.stringify(data), { status, headers });\n}\n\nconst textEnc = new TextEncoder();\nconst textDec = new TextDecoder();\n\nfunction b64Decode(str) {\n try {\n str = str.replace(/-/g, '+').replace(/_/g, '/');\n while (str.length % 4) str += '=';\n const binary = atob(str);\n const bytes = new Uint8Array(binary.length);\n for (let i = 0; i < binary.length; i++) {\n bytes[i] = binary.charCodeAt(i);\n }\n return textDec.decode(bytes);\n } catch {\n return '';\n }\n}\n\nfunction b64Encode(str) {\n const bytes = textEnc.encode(str);\n let binary = '';\n for (let i = 0; i < bytes.byteLength; i++) {\n binary += String.fromCharCode(bytes[i]);\n }\n return btoa(binary).replace(/\\+/g, '-').replace(/\\//g, '_').replace(/=+$/, '');\n}\n\nfunction decodeToken(enc) {\n try {\n const raw = b64Decode(enc);\n const parts = raw.split('|||');\n const torboxApiKey = parts[0] || '';\n let q = parts[1] ? parts[1].toUpperCase() : 'MAX';\n return { torboxApiKey, quality: q };\n } catch {\n return { torboxApiKey: '', quality: 'MAX' };\n }\n}\n\nfunction extractBoxData(buffer, boxType) {\n let offset = 0;\n while (offset + 8 <= buffer.length) {\n const size = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength).getUint32(offset, false);\n if (size < 8) break;\n\n const type = new TextDecoder().decode(buffer.subarray(offset + 4, offset + 8));\n\n if (type === boxType) {\n return buffer.subarray(offset + 8, offset + size);\n }\n\n if (['moov', 'trak', 'mdia', 'minf', 'stbl', 'stsd', 'fLaC'].includes(type)) {\n let innerStart = offset + 8;\n if (type === 'stsd') innerStart += 8;\n if (type === 'fLaC') innerStart += 28;\n\n if (innerStart < offset + size) {\n const innerData = buffer.subarray(innerStart, offset + size);\n const found = extractBoxData(innerData, boxType);\n if (found) return found;\n }\n }\n offset += size;\n }\n return null;\n}\n\nfunction concatU8(arrays) {\n let totalLength = arrays.reduce((acc, value) => acc + value.length, 0);\n let result = new Uint8Array(totalLength);\n let length = 0;\n for (let array of arrays) {\n result.set(array, length);\n length += array.length;\n }\n return result;\n}\nfunction bencodeString(strOrArr) {\n const buf = typeof strOrArr === 'string' ? textEnc.encode(strOrArr) : strOrArr;\n return concatU8([textEnc.encode(buf.length + ':'), buf]);\n}\nfunction bencodeInt(n) { return textEnc.encode(`i${n}e`); }\nfunction bencodeList(list) { return concatU8([textEnc.encode('l'), ...list, textEnc.encode('e')]); }\nfunction bencodeDict(dict) {\n const keys = Object.keys(dict).sort();\n const parts = [textEnc.encode('d')];\n for (const k of keys) {\n parts.push(bencodeString(k));\n parts.push(dict[k]);\n }\n parts.push(textEnc.encode('e'));\n return concatU8(parts);\n}\n\n// ─── Concurrent Downloader ───────────────────────────────────────────────────\n\nasync function fetchSegmentsConcurrently(urls, concurrency = 20) {\n const results = new Array(urls.length);\n const queue = urls.map((url, i) => ({ url, i }));\n\n const workers = Array(concurrency).fill(null).map(async () => {\n while (queue.length > 0) {\n const task = queue.shift();\n const res = await fetch(task.url);\n if (!res.ok) throw new Error(`Segment fetch failed: ${res.status}`);\n results[task.i] = new Uint8Array(await res.arrayBuffer());\n }\n });\n\n await Promise.all(workers);\n return results;\n}\n\n// ─── Stream Generator ────────────────────────────────────────────────────────\n\nasync function generateTorrentBuffer(info, valBaseUrl, encParam) {\n const { streamData, filename } = info;\n let sizes = [];\n let pieceHashes = [];\n const pieceLength = 524288;\n let totalLength = 0;\n let currentPiece = new Uint8Array(pieceLength);\n let currentPieceCursor = 0;\n\n async function pushData(data) {\n if (data.length === 0) return;\n totalLength += data.length;\n let valCursor = 0;\n while (valCursor < data.length) {\n const remainingSpace = pieceLength - currentPieceCursor;\n const dataToCopy = Math.min(remainingSpace, data.length - valCursor);\n currentPiece.set(data.subarray(valCursor, valCursor + dataToCopy), currentPieceCursor);\n currentPieceCursor += dataToCopy;\n valCursor += dataToCopy;\n\n if (currentPieceCursor === pieceLength) {\n const hashBuffer = await crypto.subtle.digest('SHA-1', currentPiece);\n pieceHashes.push(new Uint8Array(hashBuffer));\n currentPieceCursor = 0;\n }\n }\n }\n\n if (!streamData.isDash) {\n const res = await fetch(streamData.url);\n if (!res.ok) throw new Error('Failed to fetch direct stream');\n const reader = res.body.getReader();\n while (true) {\n const { done, value } = await reader.read();\n if (done) break;\n await pushData(value);\n }\n } else {\n // 1. Fetch Manifest XML\n let manifestUrl = streamData.url;\n let dashXml = await getCachedDashXml(manifestUrl);\n\n let manifestUrlBase = manifestUrl;\n const qIndex = manifestUrlBase.indexOf('?');\n if (qIndex > -1) manifestUrlBase = manifestUrlBase.substring(0, qIndex);\n manifestUrlBase = manifestUrlBase.substring(0, manifestUrlBase.lastIndexOf('/') + 1);\n\n const baseMatch = dashXml.match(/([^<]+)<\\/BaseURL>/);\n if (baseMatch) {\n manifestUrlBase = baseMatch[1].trim().replace(/&/g, '&');\n if (!manifestUrlBase.startsWith('http')) manifestUrlBase = new URL(manifestUrlBase, manifestUrl).toString();\n }\n\n let parsingContext = dashXml;\n const templateMatch = dashXml.match(//);\n if (templateMatch) parsingContext = templateMatch[0];\n else {\n const listMatch = dashXml.match(//);\n if (listMatch) parsingContext = listMatch[0];\n }\n\n let initSegment = '';\n const initMatch = parsingContext.match(/initialization=\"([^\"]+)\"/);\n if (initMatch) initSegment = initMatch[1].replace(/&/g, '&');\n const mediaMatch = parsingContext.match(/media=\"([^\"]+)\"/);\n const mediaTemplate = mediaMatch ? mediaMatch[1].replace(/&/g, '&') : '';\n let startNumber = 1;\n const startMatch = parsingContext.match(/startNumber=\"(\\d+)\"/);\n if (startMatch) startNumber = parseInt(startMatch[1], 10);\n\n let segments = [];\n if (initSegment) segments.push(initSegment);\n let totalSegments = 0;\n for (const tag of [...parsingContext.matchAll(/]+)>/g)]) {\n const rMatch = tag[1].match(/r=\"(\\d+)\"/);\n totalSegments += (1 + (rMatch ? parseInt(rMatch[1], 10) : 0));\n }\n\n if (mediaTemplate && totalSegments > 0) {\n for (let i = 0; i < totalSegments; i++) segments.push(mediaTemplate.replace('$Number$', startNumber + i));\n } else {\n parsingContext.match(/media=\"([^\"]+)\"/g)?.forEach(s => {\n const u = s.replace(/media=\"/, '').replace(/\"$/, '').trim();\n if (u) segments.push(u.replace(/&/g, '&'));\n });\n }\n\n const uniqueSegments = [...new Set(segments)].map(seg => {\n try { return seg.startsWith('http') ? seg : new URL(seg, manifestUrlBase).toString(); }\n catch { return seg; }\n });\n\n const isFlac = filename.endsWith('.flac');\n\n for (let i = 0; i < uniqueSegments.length; i += 20) {\n const chunkUrls = uniqueSegments.slice(i, i + 20);\n const chunkDataArr = await fetchSegmentsConcurrently(chunkUrls, 20);\n\n for (let j = 0; j < chunkUrls.length; j++) {\n let chunkData = chunkDataArr[j];\n let outData = chunkData;\n const originalIndex = i + j;\n\n if (isFlac) {\n if (originalIndex === 0) {\n const dfLa = extractBoxData(chunkData, 'dfLa');\n if (dfLa && dfLa.length > 4) {\n const metaBlock = dfLa.slice(4);\n metaBlock[0] |= 0x80;\n const flacMagic = textEnc.encode('fLaC');\n outData = new Uint8Array(flacMagic.length + metaBlock.length);\n outData.set(flacMagic);\n outData.set(metaBlock, flacMagic.length);\n } else {\n outData = new Uint8Array(0);\n }\n } else {\n const mdat = extractBoxData(chunkData, 'mdat');\n outData = mdat || new Uint8Array(0);\n }\n } else {\n if (originalIndex === 0) {\n outData = injectM4aUdta(new Uint8Array(chunkData));\n } else {\n outData = chunkData;\n }\n }\n\n sizes.push(outData.length);\n await pushData(outData);\n }\n }\n }\n\n if (currentPieceCursor > 0) {\n const hashBuffer = await crypto.subtle.digest('SHA-1', currentPiece.slice(0, currentPieceCursor));\n pieceHashes.push(new Uint8Array(hashBuffer));\n }\n\n const concatenatedHashes = concatU8(pieceHashes);\n const payloadStr = JSON.stringify({ url: streamData.url, isDash: streamData.isDash, filename, sizes });\n const torrentPayload = b64Encode(payloadStr);\n const webseedUrls = [\n `${valBaseUrl}/download/${torrentPayload}/${encodeURIComponent(filename)}`\n ];\n\n const trackers = [\n 'udp://tracker.opentrackr.org:1337/announce',\n 'udp://open.demonii.com:1337/announce',\n 'udp://open.stealth.si:80/announce',\n 'udp://tracker.torrent.eu.org:451/announce',\n 'udp://explodie.org:6969/announce',\n 'https://tracker.tamersil.de:443/announce'\n ];\n\n const infoTorrent = {\n length: bencodeInt(totalLength),\n name: bencodeString(filename),\n 'name.utf-8': bencodeString(filename),\n 'piece length': bencodeInt(pieceLength),\n pieces: bencodeString(concatenatedHashes)\n };\n\n const torrent = bencodeDict({\n announce: bencodeString(trackers[0]),\n 'announce-list': bencodeList(trackers.map(t => bencodeList([bencodeString(t)]))),\n encoding: bencodeString('UTF-8'),\n info: bencodeDict(infoTorrent),\n 'url-list': bencodeList(webseedUrls.map(u => bencodeString(u)))\n });\n\n return torrent;\n}\n\nasync function md5Hash(text) {\n try {\n const { createHash } = await import('node:crypto');\n return createHash('md5').update(text).digest('hex');\n } catch (e) {\n const msgUint8 = new TextEncoder().encode(text);\n const hashBuffer = await crypto.subtle.digest('MD5', msgUint8);\n const hashArray = Array.from(new Uint8Array(hashBuffer));\n return hashArray.map(b => b.toString(16).padStart(2, '0')).join('');\n }\n}\n\nasync function getTrackMeta(trackId) {\n const promises = [];\n\n // 1. Official Tidal API\n promises.push((async () => {\n const token = await getTidalAccessToken();\n if (!token) throw new Error('No Tidal credentials');\n \n const ac = new AbortController();\n const timer = setTimeout(() => ac.abort(), 3000);\n let res;\n try {\n res = await fetch(`https://openapi.tidal.com/v2/tracks/${trackId}?countryCode=US&include=artists`, {\n headers: {\n 'Authorization': `Bearer ${token}`,\n 'accept': 'application/vnd.api+json'\n },\n signal: ac.signal\n });\n } finally {\n clearTimeout(timer);\n }\n if (!res.ok) throw new Error('Tidal API error');\n \n const data = await res.json();\n const attrs = data?.data?.attributes || {};\n if (attrs.title) {\n let aName = 'Unknown Artist';\n if (Array.isArray(data.included)) {\n const artist = data.included.find(inc => inc.type === 'artists' || inc.type === 'artist');\n if (artist && artist.attributes && artist.attributes.name) {\n aName = artist.attributes.name;\n }\n }\n return { trackName: attrs.title, artistName: aName };\n }\n throw new Error('Invalid Tidal API response');\n })());\n\n // 2. HiFi API Lookup\n promises.push((async () => {\n const infoRes = await fetchHifiApi(`/info/?id=${trackId}`, {}, true);\n const infoJson = await infoRes.json();\n const item = infoJson?.data || infoJson;\n if (item && item.title) {\n const tName = item.title;\n const aName = item.artist?.name || item.artists?.find(a => a?.type === 'MAIN')?.name || item.artists?.[0]?.name || 'Unknown Artist';\n return { trackName: tName, artistName: aName };\n }\n throw new Error('HiFi API metadata invalid');\n })());\n\n\n\n\n let artistName = 'Unknown Artist';\n let trackName = 'Unknown Track';\n\n try {\n for (const p of promises) {\n try {\n const result = await p;\n trackName = result.trackName;\n artistName = result.artistName;\n break; // Stop at first successful deterministic promise\n } catch (err) { continue; }\n }\n } catch (e) { }\n\n const cleanTrackName = trackName.replace(/[\\/\\\\?%*:|\"<>]/g, '').trim() || 'Track';\n const cleanArtistName = artistName.replace(/[\\/\\\\?%*:|\"<>]/g, '').trim() || 'Artist';\n return { cleanTrackName, cleanArtistName };\n}\n\n// ─── Handlers ────────────────────────────────────────────────────────────────\n\nexport default async function (req) {\n try {\n if (req.method === 'OPTIONS') return new Response(null, { status: 204, headers: corsHeaders() });\n\n const url = new URL(req.url);\n const valBaseUrl = url.searchParams.get('webseed') || url.origin;\n const pathParts = url.pathname.split('/').filter(Boolean);\n\n let isStream = false;\n let isDownload = false;\n let encParam = '';\n let trackId = '';\n let downloadUuid = '';\n\n if (pathParts[0] === 'stream' && pathParts[1]) {\n isStream = true;\n encParam = pathParts[1];\n trackId = (pathParts[2] || '').replace(/^track:/, '').replace(/\\.json$/, '');\n } else if (pathParts[1] === 'stream' && pathParts[2]) {\n isStream = true;\n encParam = pathParts[0];\n trackId = (pathParts[2] || '').replace(/^track:/, '').replace(/\\.json$/, '');\n } else if (pathParts[0] === 'download' && pathParts[1]) {\n isDownload = true;\n downloadUuid = pathParts[1];\n } else if (pathParts[1] === 'download' && pathParts[2]) {\n isDownload = true;\n downloadUuid = pathParts[2];\n }\n\n if (isStream) {\n const startTime = performance.now();\n const { torboxApiKey, quality } = decodeToken(encParam);\n if (!trackId || !torboxApiKey) return new Response(JSON.stringify({ error: 'Missing trackId or API key' }), { status: 400, headers: corsHeaders() });\n\n console.log(`[Stream] Requesting track ${trackId}`);\n\n const tMetaStart = performance.now();\n const { cleanTrackName, cleanArtistName } = await getTrackMeta(trackId);\n const tMetaDuration = Math.round(performance.now() - tMetaStart);\n\n const FALLBACK_CHAINS = {\n MAX: ['HI_RES_LOSSLESS', 'LOSSLESS', 'HIGH', 'LOW'],\n HIRES: ['HI_RES_LOSSLESS', 'LOSSLESS', 'HIGH', 'LOW'],\n LOSSLESS: ['LOSSLESS', 'HIGH', 'LOW'],\n HIGH: ['HIGH', 'LOW'],\n LOW: ['LOW'],\n };\n const metaMap = {\n HI_RES_LOSSLESS: { label: 'Hi-Res', ext: 'flac' },\n LOSSLESS: { label: 'HiFi CD', ext: 'flac' },\n HIGH: { label: '320kbps', ext: 'm4a' },\n LOW: { label: '96kbps', ext: 'm4a' },\n };\n\n const chain = FALLBACK_CHAINS[quality] || FALLBACK_CHAINS['MAX'];\n let hashes = {};\n\n const tHashStart = performance.now();\n for (const formatKey of chain) {\n const info = metaMap[formatKey];\n if (!info) continue;\n const fn = `${cleanTrackName} - ${cleanArtistName} [NullBeat ${trackId} - ${info.label}].${info.ext}`;\n const md5 = await md5Hash(fn);\n hashes[md5] = { formatKey, filename: fn, label: info.label, ext: info.ext };\n }\n const tHashDuration = Math.round(performance.now() - tHashStart);\n\n const hashList = Object.keys(hashes).join(',');\n let cachedHashes = {};\n\n const tCheckCacheStart = performance.now();\n try {\n let cacheData = null;\n const torboxCacheKey = `check_${hashList}`;\n const memCache = trackRequestLockMap.get(torboxCacheKey);\n \n if (memCache && Date.now() - memCache.timestamp < 300000) { // 5 min cache\n cacheData = memCache.data;\n } else {\n const cacheRes = await fetch(`https://api.torbox.app/v1/api/torrents/checkcached?hash=${hashList}&format=object&list_files=false`, {\n headers: { 'Authorization': `Bearer ${torboxApiKey}` }\n }).catch(() => null);\n\n if (cacheRes && (cacheRes.status === 401 || cacheRes.status === 403)) {\n return new Response(JSON.stringify({ error: 'Invalid Torbox API Key' }), { status: 401, headers: corsHeaders() });\n }\n\n if (cacheRes && cacheRes.ok) {\n cacheData = await cacheRes.json();\n if (cacheData.success) {\n trackRequestLockMap.set(torboxCacheKey, { timestamp: Date.now(), data: cacheData });\n }\n }\n }\n\n if (cacheData && cacheData.success && cacheData.data) {\n const cachedItems = Object.values(cacheData.data);\n for (const formatKey of chain) {\n const info = metaMap[formatKey];\n if (!info) continue;\n const expectedBase = `${cleanTrackName} - ${cleanArtistName} [NullBeat ${trackId} - ${info.label}]`;\n const match = cachedItems.find(item => item && (item.name === expectedBase || item.name?.startsWith(expectedBase)));\n if (match && match.hash) {\n cachedHashes[formatKey] = match.hash;\n }\n }\n }\n } catch (err) {\n console.error('[Torbox] Cache check error:', err.message);\n }\n const tCheckCacheDuration = Math.round(performance.now() - tCheckCacheStart);\n\n const topFormatKey = chain[0];\n let isCached = false;\n let cachedHash = null;\n let finalQualityLabel = metaMap[topFormatKey]?.label || quality;\n let filename = '';\n\n if (cachedHashes[topFormatKey]) {\n isCached = true;\n cachedHash = cachedHashes[topFormatKey];\n filename = `${cleanTrackName} - ${cleanArtistName} [NullBeat ${trackId} - ${finalQualityLabel}].${metaMap[topFormatKey].ext}`;\n }\n\n let uri = '';\n let streamData = null;\n let tDashDuration = 0;\n\n if (!isCached) {\n const tDashStart = performance.now();\n // Enforce 2-minute deduplication lock for uncached tracks currently in queue/processing\n const trackLockKey = `${torboxApiKey}_${trackId}`;\n if (!checkTrackLock(trackLockKey, 120000)) {\n return new Response(JSON.stringify({ error: 'Already in queue. Please wait a moment before requesting this track again.' }), { status: 429, headers: corsHeaders() });\n }\n\n let isLossless = (quality === 'MAX' || quality === 'HIRES' || quality === 'LOSSLESS');\n let uri = null;\n let actualQuality = 'HIGH';\n\n if (isLossless) {\n let formats = (quality === 'LOSSLESS') ? 'FLAC' : 'FLAC_HIRES';\n let streamApiRes;\n\n try {\n streamApiRes = await fetchHifiApi(`/trackManifests/?id=${trackId}&formats=${formats}&manifestType=MPEG_DASH&uriScheme=HTTPS&usage=PLAYBACK`);\n } catch (e) {\n if (formats !== 'FLAC') {\n try {\n streamApiRes = await fetchHifiApi(`/trackManifests/?id=${trackId}&formats=FLAC&manifestType=MPEG_DASH&uriScheme=HTTPS&usage=PLAYBACK`);\n } catch (e2) {}\n }\n }\n\n if (streamApiRes && streamApiRes.ok) {\n const streamApiJson = await streamApiRes.json();\n const attributes = streamApiJson?.data?.data?.attributes;\n uri = attributes?.uri;\n const returnedFormats = Array.isArray(attributes?.formats) ? attributes.formats : [];\n if (returnedFormats.includes('FLAC_HIRES')) actualQuality = 'FLAC_HIRES';\n else if (returnedFormats.includes('FLAC')) actualQuality = 'FLAC';\n }\n }\n\n if (!uri) {\n const trackRes = await fetchHifiApi(`/track/?id=${trackId}&quality=${quality === 'LOW' ? 'LOW' : 'HIGH'}`);\n const trackJson = await trackRes.json();\n const item = trackJson?.data || trackJson;\n if (item && item.manifest) {\n uri = `data:application/dash+xml;base64,${item.manifest}`;\n actualQuality = item.audioQuality || 'HIGH';\n }\n }\n\n if (!uri) throw new Error(\"Missing URI in manifest response from HiFi API\");\n\n let dashXml;\n try {\n if (uri.startsWith('data:')) {\n dashXml = b64Decode(uri.split(',')[1]);\n } else {\n const xmlRes = await fetch(uri);\n if (xmlRes.ok) dashXml = await xmlRes.text();\n }\n } catch (e) { }\n\n let durationSeconds = 0;\n if (dashXml) {\n if (dashXml.includes('id=\"FLAC_HIRES') || dashXml.includes('FLAC_HIRES,')) actualQuality = 'FLAC_HIRES';\n else if (dashXml.includes('id=\"FLAC') || dashXml.includes('FLAC,')) actualQuality = 'FLAC';\n \n const durMatch = dashXml.match(/mediaPresentationDuration=\"([^\"]+)\"/);\n if (durMatch) {\n const m = durMatch[1].match(/PT(?:(\\d+)H)?(?:(\\d+)M)?(?:([\\d\\.]+)S)?/);\n if (m) {\n const h = parseFloat(m[1] || '0');\n const min = parseFloat(m[2] || '0');\n const s = parseFloat(m[3] || '0');\n durationSeconds = (h * 3600) + (min * 60) + s;\n }\n }\n }\n\n if (actualQuality === 'FLAC_HIRES') finalQualityLabel = 'Hi-Res';\n else if (actualQuality.includes('FLAC')) finalQualityLabel = 'HiFi CD';\n else if (actualQuality === 'HIGH') finalQualityLabel = '320kbps';\n else if (actualQuality === 'LOW') finalQualityLabel = '96kbps';\n else finalQualityLabel = actualQuality;\n const isFlac = actualQuality.includes('FLAC');\n const ext = isFlac ? 'flac' : 'm4a';\n\n filename = `${cleanTrackName} - ${cleanArtistName} [NullBeat ${trackId} - ${finalQualityLabel}].${ext}`;\n streamData = { url: uri, isDash: true, ext, quality: actualQuality, durationSeconds };\n\n const actualFormatKey = actualQuality === 'FLAC_HIRES' ? 'HI_RES_LOSSLESS' : 'LOSSLESS';\n if (cachedHashes[actualFormatKey]) {\n isCached = true;\n cachedHash = cachedHashes[actualFormatKey];\n }\n tDashDuration = Math.round(performance.now() - tDashStart);\n }\n\n const formData = new FormData();\n formData.append('seed', '3');\n formData.append('allow_zip', 'false');\n formData.append('name', filename);\n\n let torrentId = null;\n let tMyListDuration = 0; // Deprecated, kept for timing log consistency\n\n // Reuse a single connection for createtorrent + requestdl via keepalive\n const torboxHeaders = {\n 'Authorization': `Bearer ${torboxApiKey}`,\n 'Connection': 'keep-alive',\n };\n\n let tCreateTorrentDuration = 0;\n const tCreateTorrentStart = performance.now();\n if (isCached && cachedHash) {\n // Fast-path: add_only_if_cached skips TorBox DHT/metadata lookup entirely (~1-2s saved)\n formData.append('magnet', `magnet:?xt=urn:btih:${cachedHash}`);\n formData.append('add_only_if_cached', 'true');\n } else {\n const torrentBuffer = await generateTorrentBuffer({ streamData, filename }, valBaseUrl, encParam);\n formData.append('file', new Blob([torrentBuffer], { type: 'application/x-bittorrent' }), `${filename}.torrent`);\n }\n\n const addRes = await fetch('https://api.torbox.app/v1/api/torrents/createtorrent', {\n method: 'POST',\n headers: torboxHeaders,\n body: formData\n });\n\n const addData = await addRes.json();\n if (addData.success && addData.data?.torrent_id) {\n torrentId = addData.data.torrent_id;\n } else {\n console.error('[Torbox Error]:', addData);\n return new Response(JSON.stringify({ error: 'Failed to submit to Torbox', details: addData }), { status: 502, headers: corsHeaders() });\n }\n tCreateTorrentDuration = Math.round(performance.now() - tCreateTorrentStart);\n\n let tPollDuration = 0;\n if (torrentId) {\n // Verify that the track is fully cached and playable before serving URL\n if (!isCached) {\n const tPollStart = performance.now();\n console.log(`[Torbox] Waiting for WebSeed caching to complete for Torrent ID: ${torrentId}...`);\n let isFullyCached = false;\n let attempts = 0;\n const maxAttempts = 15; // 30 seconds max\n\n while (!isFullyCached && attempts < maxAttempts) {\n await new Promise(resolve => setTimeout(resolve, 2000));\n try {\n const statusRes = await fetch('https://api.torbox.app/v1/api/torrents/mylist?bypass_cache=true', {\n headers: { 'Authorization': `Bearer ${torboxApiKey}` }\n });\n if (statusRes.ok) {\n const statusData = await statusRes.json();\n if (statusData.success && Array.isArray(statusData.data)) {\n const torrentInfo = statusData.data.find(t => t.id === torrentId);\n const state = String(torrentInfo?.download_state || torrentInfo?.status || '').toLowerCase();\n if (torrentInfo && (state === 'cached' || torrentInfo.cached === true)) {\n console.log(`[Torbox] WebSeed caching completed successfully! State: ${state}`);\n isFullyCached = true;\n }\n }\n }\n } catch (e) {\n console.error('[Torbox] Status polling error:', e.message);\n }\n attempts++;\n }\n tPollDuration = Math.round(performance.now() - tPollStart);\n\n if (!isFullyCached) {\n return new Response(JSON.stringify({ error: 'Track is currently caching on Torbox. Please try again in 15 seconds.' }), { status: 503, headers: corsHeaders() });\n }\n }\n\n // Edit torrent item on Torbox (Name, NullBeat tag, Airlocked) - Non-blocking background fire-and-forget\n const tEditTorrentDuration = 0;\n fetch('https://api.torbox.app/v1/api/torrents/edittorrent', {\n method: 'PUT',\n headers: {\n 'Authorization': `Bearer ${torboxApiKey}`,\n 'Content-Type': 'application/json'\n },\n body: JSON.stringify({\n torrent_id: torrentId,\n name: filename,\n tags: ['NullBeat'],\n airlocked: true\n })\n }).catch(e => console.error('[Torbox] Background Edit torrent error:', e.message));\n\n let tReqDlDuration = 0;\n const tReqDlStart = performance.now();\n const finalCdnUrl = `https://api.torbox.app/v1/api/torrents/requestdl?token=${torboxApiKey}&torrent_id=${torrentId}&file_id=0&redirect=true&append_name=true`;\n tReqDlDuration = Math.round(performance.now() - tReqDlStart);\n\n const totalDuration = Math.round(performance.now() - startTime);\n\n console.log(`[TIMING] Track ${trackId} Total: ${totalDuration}ms | Meta: ${tMetaDuration}ms | HashGen: ${tHashDuration}ms | CheckCached (Parallel): ${tCheckCacheDuration}ms | MyListLookup: ${tMyListDuration}ms | CreateTorrent: ${tCreateTorrentDuration}ms | PollCache: ${tPollDuration}ms | EditTorrent (Async): ${tEditTorrentDuration}ms | RequestDL: ${tReqDlDuration}ms`);\n\n const ext = filename.endsWith('.flac') ? 'flac' : (filename.endsWith('.m4a') ? 'm4a' : 'mp3');\n const expiresAt = Math.floor(Date.now() / 1000) + 86400;\n\n return jsonResp({\n url: finalCdnUrl,\n format: ext,\n quality: finalQualityLabel,\n expiresAt: expiresAt\n });\n }\n }\n\n if (isDownload) {\n console.log(`[Download] Serving request for ${downloadUuid.slice(0, 10)}...`);\n const uuid = downloadUuid.replace(/[^A-Za-z0-9\\-_]+$/, ''); // strip trailing non-base64url chars (e.g. bencode end markers \"ee\")\n let data;\n try { data = JSON.parse(b64Decode(uuid)); }\n catch { return new Response('Invalid UUID', { status: 400 }); }\n\n if (!data.isDash) return new Response(null, { status: 302, headers: { Location: data.url } });\n\n const rangeHeader = req.headers.get('Range');\n let rangeStart = 0, rangeEnd = Infinity;\n if (rangeHeader) {\n const match = rangeHeader.match(/bytes=(\\d+)-(.*)/);\n if (match) {\n rangeStart = parseInt(match[1], 10);\n if (match[2]) rangeEnd = parseInt(match[2], 10);\n }\n }\n\n const isFlac = data.filename.endsWith('.flac');\n const totalSize = data.sizes.reduce((a, b) => a + b, 0);\n const resolvedEnd = rangeEnd !== Infinity ? rangeEnd : totalSize - 1;\n\n let dashXml;\n let manifestUrl = data.url;\n try {\n dashXml = await getCachedDashXml(manifestUrl);\n } catch (e) {\n return new Response('Failed to fetch DASH XML', { status: 502 });\n }\n\n let manifestUrlBase = manifestUrl;\n const qIndex = manifestUrlBase.indexOf('?');\n if (qIndex > -1) manifestUrlBase = manifestUrlBase.substring(0, qIndex);\n manifestUrlBase = manifestUrlBase.substring(0, manifestUrlBase.lastIndexOf('/') + 1);\n\n const baseMatch = dashXml.match(/([^<]+)<\\/BaseURL>/);\n if (baseMatch) manifestUrlBase = baseMatch[1].trim().replace(/&/g, '&');\n\n let parsingContext = dashXml.match(//)?.[0]\n || dashXml.match(//)?.[0] || dashXml;\n\n const initMatch = parsingContext.match(/initialization=\"([^\"]+)\"/);\n const mediaMatch = parsingContext.match(/media=\"([^\"]+)\"/);\n const startMatch = parsingContext.match(/startNumber=\"(\\d+)\"/);\n\n let segments = [];\n if (initMatch) segments.push(initMatch[1].replace(/&/g, '&'));\n const mediaTemplate = mediaMatch ? mediaMatch[1].replace(/&/g, '&') : '';\n let startNumber = startMatch ? parseInt(startMatch[1], 10) : 1;\n let totalSegments = 0;\n for (const tag of [...parsingContext.matchAll(/]+)>/g)]) {\n const rMatch = tag[1].match(/r=\"(\\d+)\"/);\n totalSegments += (1 + (rMatch ? parseInt(rMatch[1], 10) : 0));\n }\n\n if (mediaTemplate && totalSegments > 0) {\n for (let i = 0; i < totalSegments; i++) segments.push(mediaTemplate.replace('$Number$', startNumber + i));\n } else {\n parsingContext.match(/media=\"([^\"]+)\"/g)?.forEach(s => {\n const u = s.replace(/media=\"/, '').replace(/\"$/, '').trim();\n if (u) segments.push(u.replace(/&/g, '&'));\n });\n }\n\n const uniqueSegments = [...new Set(segments)].map(seg => seg.startsWith('http') ? seg : new URL(seg, manifestUrlBase).toString());\n\n let current = 0;\n let segmentOffsetsMap = data.sizes.map(s => { const cur = current; current += s; return cur; });\n\n let segmentsToFetch = [];\n let segmentOffsets = [];\n let segmentIndices = [];\n\n for (let i = 0; i < uniqueSegments.length; i++) {\n const segStart = segmentOffsetsMap[i];\n const segEnd = segStart + data.sizes[i] - 1;\n if (segStart <= resolvedEnd && segEnd >= rangeStart) {\n let segUrl = uniqueSegments[i];\n if (manifestUrl.includes('?') && !segUrl.includes('?')) segUrl += manifestUrl.substring(manifestUrl.indexOf('?'));\n segmentsToFetch.push(segUrl);\n segmentOffsets.push(segStart);\n segmentIndices.push(i);\n }\n }\n\n const contentType = isFlac ? 'audio/flac' : 'audio/mp4';\n const responseHeaders = new Headers({\n 'Content-Disposition': `attachment; filename*=UTF-8''${encodeURIComponent(data.filename)}`,\n 'Content-Type': contentType,\n 'Accept-Ranges': 'bytes',\n 'Connection': 'keep-alive'\n });\n\n if (rangeHeader) {\n responseHeaders.set('Content-Range', `bytes ${rangeStart}-${resolvedEnd}/${totalSize}`);\n responseHeaders.set('Content-Length', (resolvedEnd - rangeStart + 1).toString());\n } else {\n responseHeaders.set('Content-Length', totalSize.toString());\n }\n\n if (req.method === 'HEAD') return new Response(null, { status: rangeHeader ? 206 : 200, headers: responseHeaders });\n\n const { readable, writable } = new TransformStream();\n const writer = writable.getWriter();\n\n (async () => {\n try {\n const CONCURRENCY = 20;\n for (let i = 0; i < segmentsToFetch.length; i += CONCURRENCY) {\n const batch = segmentsToFetch.slice(i, i + CONCURRENCY);\n const chunkDataArr = await fetchSegmentsConcurrently(batch, CONCURRENCY);\n\n for (let j = 0; j < batch.length; j++) {\n let outData = chunkDataArr[j];\n const originalIndex = segmentIndices[i + j];\n\n if (isFlac) {\n if (originalIndex === 0) {\n const dfLa = extractBoxData(outData, 'dfLa');\n if (dfLa && dfLa.length > 4) {\n const metaBlock = dfLa.slice(4);\n metaBlock[0] |= 0x80;\n const flacMagic = textEnc.encode('fLaC');\n const newOut = new Uint8Array(flacMagic.length + metaBlock.length);\n newOut.set(flacMagic);\n newOut.set(metaBlock, flacMagic.length);\n outData = newOut;\n } else outData = new Uint8Array(0);\n } else {\n outData = extractBoxData(outData, 'mdat') || new Uint8Array(0);\n }\n } else {\n if (originalIndex === 0) {\n outData = injectM4aUdta(new Uint8Array(outData));\n }\n }\n\n const currentSegOffset = segmentOffsets[i + j];\n const outSize = outData.length;\n const startInChunk = Math.max(0, rangeStart - currentSegOffset);\n const currentEndOffset = currentSegOffset + outSize;\n\n if (startInChunk > 0 || currentEndOffset > resolvedEnd + 1) {\n const endInChunk = Math.min(outSize, outSize - Math.max(0, currentEndOffset - (resolvedEnd + 1)));\n outData = outData.slice(startInChunk, endInChunk);\n }\n\n if (outData.length > 0) await writer.write(outData);\n }\n }\n } catch (e) {\n console.error(`[WebSeed] Stream Error:`, e.message);\n } finally {\n writer.close();\n }\n })();\n\n return new Response(readable, { status: rangeHeader ? 206 : 200, headers: responseHeaders });\n }\n\n return new Response(\"NullBeat Val.town Proxy Online\", { status: 200 });\n\n } catch (err) {\n console.error('Unhandled server error:', err.message);\n return new Response(JSON.stringify({\n error: 'Internal Server Error',\n message: err.message\n }), { status: 500, headers: corsHeaders() });\n }\n}\n\n// ─── M4A Metadata Injector ──────────────────────────────────────────────────\n\nfunction injectM4aUdta(buffer) {\n let offset = 0;\n const dv = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength);\n \n let moovOffset = -1;\n let moovSize = 0;\n \n while (offset + 8 <= buffer.length) {\n const size = dv.getUint32(offset, false);\n if (size < 8) break;\n const type = new TextDecoder().decode(buffer.subarray(offset + 4, offset + 8));\n if (type === 'moov') {\n moovOffset = offset;\n moovSize = size;\n break;\n }\n offset += size;\n }\n \n if (moovOffset === -1) return buffer;\n \n const udtaHex = \"0000003075647461000000286d657461000000000000001c68646c7200000000000000006d6469726170706c0000000000000000\";\n const udtaBytes = new Uint8Array(48);\n for(let i = 0; i < 48; i++) {\n udtaBytes[i] = parseInt(udtaHex.substring(i*2, i*2+2), 16);\n }\n \n let subOffset = moovOffset + 8;\n const moovEnd = moovOffset + moovSize;\n const cleanMoov = [];\n \n while (subOffset + 8 <= moovEnd) {\n const s = dv.getUint32(subOffset, false);\n if (s < 8) break;\n const t = new TextDecoder().decode(buffer.subarray(subOffset + 4, subOffset + 8));\n if (t !== 'udta') {\n cleanMoov.push(buffer.subarray(subOffset, subOffset + s));\n }\n subOffset += s;\n }\n \n const cleanMoovLength = cleanMoov.reduce((acc, val) => acc + val.length, 0);\n const newMoovSize = 8 + cleanMoovLength + 48;\n \n const newBuf = new Uint8Array(buffer.length - moovSize + newMoovSize);\n newBuf.set(buffer.subarray(0, moovOffset), 0);\n \n const newDv = new DataView(newBuf.buffer, newBuf.byteOffset, newBuf.byteLength);\n newDv.setUint32(moovOffset, newMoovSize, false);\n newBuf.set(new Uint8Array([109, 111, 111, 118]), moovOffset + 4);\n \n let currentOffset = moovOffset + 8;\n for (const child of cleanMoov) {\n newBuf.set(child, currentOffset);\n currentOffset += child.length;\n }\n \n newBuf.set(udtaBytes, currentOffset);\n currentOffset += 48;\n \n if (moovEnd < buffer.length) {\n newBuf.set(buffer.subarray(moovEnd), currentOffset);\n }\n \n return newBuf;\n}","label","nullbeat",[73],"pulls","branches","forks","envVars",{"_172":174,"_175":97},"connections",{"_172":97,"_173":97},"count","unfilledCount",4,"emptyCount",{"_29":155,"_13":73,"_58":59,"_39":-5,"_31":32,"_156":117,"_157":93,"_33":177,"_35":159,"_61":81,"_160":161,"_63":24,"_162":163,"_178":179,"_132":180},["D",1788690154311],"children",[],[73],["D",1787588563935],{"_11":12,"_131":66},{"_11":12,"_126":127,"_65":66,"_25":64,"_128":129,"_130":24},{"_35":117,"_13":16,"_29":32,"_118":82,"_119":-5,"_120":-5,"_121":-5,"_122":-5,"_123":-5,"_124":14,"_125":12},"ctx",{"_47":-5,"_151":218,"_219":220,"_221":222,"_223":24,"_224":24,"_225":24,"_226":93,"_227":-5,"_228":-7,"_229":-7,"_230":97,"_231":24,"_232":24,"_233":-5,"_234":24,"_235":24,"_236":24,"_237":-5},"ENV",{"_189":190,"_191":192,"_193":16,"_194":195,"_196":197,"_198":199,"_200":201,"_202":203,"_204":205,"_206":207,"_208":209,"_210":211,"_212":213,"_214":215,"_216":217},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

History