mebox-extractor

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🎬 A powerful and type-safe video metadata extractor for YouTube and Bilibili platforms with full TypeScript support

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{"version":3,"sources":["../node_modules/retry/lib/retry_operation.js","../node_modules/retry/lib/retry.js","../node_modules/retry/index.js","../src/index.ts","../src/utils/http.ts","../node_modules/p-retry/index.js","../node_modules/is-network-error/index.js","../src/utils/cookie.ts","../src/clients/wbi-sign.ts","../src/clients/bilibili.ts","../src/extractors/bilibili.ts","../src/extractors/youtube.ts","../src/utils/browser.ts","../src/utils/common.ts"],"sourcesContent":["function RetryOperation(timeouts, options) {\n // Compatibility for the old (timeouts, retryForever) signature\n if (typeof options === 'boolean') {\n options = { forever: options };\n }\n\n this._originalTimeouts = JSON.parse(JSON.stringify(timeouts));\n this._timeouts = timeouts;\n this._options = options || {};\n this._maxRetryTime = options && options.maxRetryTime || Infinity;\n this._fn = null;\n this._errors = [];\n this._attempts = 1;\n this._operationTimeout = null;\n this._operationTimeoutCb = null;\n this._timeout = null;\n this._operationStart = null;\n this._timer = null;\n\n if (this._options.forever) {\n this._cachedTimeouts = this._timeouts.slice(0);\n }\n}\nmodule.exports = RetryOperation;\n\nRetryOperation.prototype.reset = function() {\n this._attempts = 1;\n this._timeouts = this._originalTimeouts.slice(0);\n}\n\nRetryOperation.prototype.stop = function() {\n if (this._timeout) {\n clearTimeout(this._timeout);\n }\n if (this._timer) {\n clearTimeout(this._timer);\n }\n\n this._timeouts = [];\n this._cachedTimeouts = null;\n};\n\nRetryOperation.prototype.retry = function(err) {\n if (this._timeout) {\n clearTimeout(this._timeout);\n }\n\n if (!err) {\n return false;\n }\n var currentTime = new Date().getTime();\n if (err && currentTime - this._operationStart >= this._maxRetryTime) {\n this._errors.push(err);\n this._errors.unshift(new Error('RetryOperation timeout occurred'));\n return false;\n }\n\n this._errors.push(err);\n\n var timeout = this._timeouts.shift();\n if (timeout === undefined) {\n if (this._cachedTimeouts) {\n // retry forever, only keep last error\n this._errors.splice(0, this._errors.length - 1);\n timeout = this._cachedTimeouts.slice(-1);\n } else {\n return false;\n }\n }\n\n var self = this;\n this._timer = setTimeout(function() {\n self._attempts++;\n\n if (self._operationTimeoutCb) {\n self._timeout = setTimeout(function() {\n self._operationTimeoutCb(self._attempts);\n }, self._operationTimeout);\n\n if (self._options.unref) {\n self._timeout.unref();\n }\n }\n\n self._fn(self._attempts);\n }, timeout);\n\n if (this._options.unref) {\n this._timer.unref();\n }\n\n return true;\n};\n\nRetryOperation.prototype.attempt = function(fn, timeoutOps) {\n this._fn = fn;\n\n if (timeoutOps) {\n if (timeoutOps.timeout) {\n this._operationTimeout = timeoutOps.timeout;\n }\n if (timeoutOps.cb) {\n this._operationTimeoutCb = timeoutOps.cb;\n }\n }\n\n var self = this;\n if (this._operationTimeoutCb) {\n this._timeout = setTimeout(function() {\n self._operationTimeoutCb();\n }, self._operationTimeout);\n }\n\n this._operationStart = new Date().getTime();\n\n this._fn(this._attempts);\n};\n\nRetryOperation.prototype.try = function(fn) {\n console.log('Using RetryOperation.try() is deprecated');\n this.attempt(fn);\n};\n\nRetryOperation.prototype.start = function(fn) {\n console.log('Using RetryOperation.start() is deprecated');\n this.attempt(fn);\n};\n\nRetryOperation.prototype.start = RetryOperation.prototype.try;\n\nRetryOperation.prototype.errors = function() {\n return this._errors;\n};\n\nRetryOperation.prototype.attempts = function() {\n return this._attempts;\n};\n\nRetryOperation.prototype.mainError = function() {\n if (this._errors.length === 0) {\n return null;\n }\n\n var counts = {};\n var mainError = null;\n var mainErrorCount = 0;\n\n for (var i = 0; i < this._errors.length; i++) {\n var error = this._errors[i];\n var message = error.message;\n var count = (counts[message] || 0) + 1;\n\n counts[message] = count;\n\n if (count >= mainErrorCount) {\n mainError = error;\n mainErrorCount = count;\n }\n }\n\n return mainError;\n};\n","var RetryOperation = require('./retry_operation');\n\nexports.operation = function(options) {\n var timeouts = exports.timeouts(options);\n return new RetryOperation(timeouts, {\n forever: options && (options.forever || options.retries === Infinity),\n unref: options && options.unref,\n maxRetryTime: options && options.maxRetryTime\n });\n};\n\nexports.timeouts = function(options) {\n if (options instanceof Array) {\n return [].concat(options);\n }\n\n var opts = {\n retries: 10,\n factor: 2,\n minTimeout: 1 * 1000,\n maxTimeout: Infinity,\n randomize: false\n };\n for (var key in options) {\n opts[key] = options[key];\n }\n\n if (opts.minTimeout > opts.maxTimeout) {\n throw new Error('minTimeout is greater than maxTimeout');\n }\n\n var timeouts = [];\n for (var i = 0; i < opts.retries; i++) {\n timeouts.push(this.createTimeout(i, opts));\n }\n\n if (options && options.forever && !timeouts.length) {\n timeouts.push(this.createTimeout(i, opts));\n }\n\n // sort the array numerically ascending\n timeouts.sort(function(a,b) {\n return a - b;\n });\n\n return timeouts;\n};\n\nexports.createTimeout = function(attempt, opts) {\n var random = (opts.randomize)\n ? (Math.random() + 1)\n : 1;\n\n var timeout = Math.round(random * Math.max(opts.minTimeout, 1) * Math.pow(opts.factor, attempt));\n timeout = Math.min(timeout, opts.maxTimeout);\n\n return timeout;\n};\n\nexports.wrap = function(obj, options, methods) {\n if (options instanceof Array) {\n methods = options;\n options = null;\n }\n\n if (!methods) {\n methods = [];\n for (var key in obj) {\n if (typeof obj[key] === 'function') {\n methods.push(key);\n }\n }\n }\n\n for (var i = 0; i < methods.length; i++) {\n var method = methods[i];\n var original = obj[method];\n\n obj[method] = function retryWrapper(original) {\n var op = exports.operation(options);\n var args = Array.prototype.slice.call(arguments, 1);\n var callback = args.pop();\n\n args.push(function(err) {\n if (op.retry(err)) {\n return;\n }\n if (err) {\n arguments[0] = op.mainError();\n }\n callback.apply(this, arguments);\n });\n\n op.attempt(function() {\n original.apply(obj, args);\n });\n }.bind(obj, original);\n obj[method].options = options;\n }\n};\n","module.exports = require('./lib/retry');","/**\n * Main extractor module for video metadata from YouTube and Bilibili platforms\n * Provides a unified interface for extracting video information\n */\nimport { extractBilibiliVideoMetadata } from './extractors/bilibili'\nimport { extractYoutubeVideoMetadata } from './extractors/youtube'\nimport { convertURLToWebsiteKey } from './utils/browser'\nimport { VideoMetadataSchema, ExtractorOptions, VideoMetadata, Website } from './types'\nimport { getVideoIdByURL } from './utils/common'\n\ntype BilibiliExtractor = typeof extractBilibiliVideoMetadata\ntype YouTubeExtractor = typeof extractYoutubeVideoMetadata\n\n/**\n * Registry of video metadata extractors mapped by website\n */\nconst VIDEO_METADATA_EXTRACTOR: Record<Website, BilibiliExtractor | YouTubeExtractor> = {\n bilibili: extractBilibiliVideoMetadata,\n youtube: extractYoutubeVideoMetadata\n}\n\n/**\n * Extracts video metadata from supported platforms (YouTube and Bilibili)\n * @param url - The video URL to extract metadata from\n * @param options - Optional extraction options including resolution and cookies\n * @returns Promise resolving to video metadata\n * @throws Error if the website is not supported or video ID cannot be found\n */\nexport const extract = async (\n url: string,\n options: ExtractorOptions = {}\n): Promise<VideoMetadataSchema> => {\n // Determine the website platform from URL\n const website = convertURLToWebsiteKey(url)\n const extractor = VIDEO_METADATA_EXTRACTOR[website!]\n\n if (!extractor) {\n throw new Error(`The website ${website} is not supported`)\n }\n\n // Extract video ID from URL\n const videoId = getVideoIdByURL(url)\n\n if (!videoId) {\n throw new Error(`The video id is not found`)\n }\n\n let metadata: VideoMetadata\n\n // Call the appropriate extractor based on website\n if (website === 'bilibili') {\n metadata = await (extractor as BilibiliExtractor)(url, videoId, options)\n } else {\n metadata = await (extractor as YouTubeExtractor)(url, options)\n }\n\n return metadata\n}\n\n/**\n * Alias for the main extract function\n */\nexport const extractVideoMetadata = extract\n\n/**\n * Default export for the extract function\n */\nexport { extract as default }\n\nexport type {\n VideoMetadata,\n VideoMetadataSchema,\n ExtractorOptions,\n Website,\n SubTitles,\n SubTitleItem,\n DownloadFormat,\n Resolution\n} from './types'\n\nexport { convertURLToWebsiteKey } from './utils/browser'\nexport { getVideoIdByURL } from './utils/common'\nexport { BilibiliClient } from './clients/bilibili'","/**\n * HTTP client utilities with retry logic and error handling\n */\nimport { merge } from \"lodash-es\";\nimport pRetry from \"p-retry\";\n\n/**\n * API path type that must start with a slash\n */\ntype Path = `/${string}`;\n\n/**\n * Configuration options for API client\n */\nexport interface APIClientOptions<T> {\n init?: RequestInit;\n afterResponse?: (response: Response) => Promise<T>;\n}\n\n/**\n * Generic API client with retry logic and configurable response handling\n */\nexport class APIClient<\n O extends APIClientOptions<unknown> = APIClientOptions<Response>,\n> {\n /**\n * Creates a new API client\n * @param url - Base URL for the API\n * @param options - Client configuration options\n */\n constructor(\n private url: string,\n private options?: O,\n ) {}\n\n /**\n * Static method to send a simple HTTP request with retry logic\n * @param url - Full URL to send request to\n * @param init - Fetch request options\n * @returns Promise resolving to Response\n */\n static async send(url: string, init?: RequestInit): Promise<Response> {\n return pRetry(\n async () => {\n const response = await fetch(url, init);\n if (!response.ok) {\n throw new Error(`Request failed with status code ${response.status}`);\n }\n return response;\n },\n { retries: 3 },\n );\n }\n\n /**\n * Sends a request to the configured base URL with optional path\n * @param path - API endpoint path\n * @param init - Fetch request options\n * @returns Promise resolving to processed response\n */\n async send(path?: Path, init?: RequestInit) {\n const endpoint = `${this.url}${path ?? \"\"}`;\n const parsedInit = merge(init ?? {}, this.options?.init ?? {});\n\n const response = await pRetry(\n async () => {\n const res = await fetch(endpoint, parsedInit);\n if (!res.ok) {\n throw new Error(`Request failed with status code ${res.status}`);\n }\n return res;\n },\n { retries: 3 },\n );\n\n // Apply custom response processing if configured\n return (this.options?.afterResponse?.(response) ??\n response) as O extends APIClientOptions<infer T> ? T : Response;\n }\n\n /**\n * Sends a GET request\n * @param path - API endpoint path\n * @param init - Additional fetch options\n * @returns Promise resolving to response\n */\n async get(path: Path, init?: RequestInit) {\n return this.send(path, merge(init, { method: \"GET\" }));\n }\n\n /**\n * Sends a POST request with JSON body\n * @param path - API endpoint path\n * @param body - Request body data\n * @param init - Additional fetch options\n * @returns Promise resolving to response\n */\n async post(path: Path, body?: Record<string, unknown>, init?: RequestInit) {\n return this.send(\n path,\n merge(init, {\n method: \"POST\",\n body: JSON.stringify(body),\n headers: { \"Content-Type\": \"application/json\" },\n }),\n );\n }\n}\n","import retry from 'retry';\nimport isNetworkError from 'is-network-error';\n\nexport class AbortError extends Error {\n\tconstructor(message) {\n\t\tsuper();\n\n\t\tif (message instanceof Error) {\n\t\t\tthis.originalError = message;\n\t\t\t({message} = message);\n\t\t} else {\n\t\t\tthis.originalError = new Error(message);\n\t\t\tthis.originalError.stack = this.stack;\n\t\t}\n\n\t\tthis.name = 'AbortError';\n\t\tthis.message = message;\n\t}\n}\n\nconst decorateErrorWithCounts = (error, attemptNumber, options) => {\n\t// Minus 1 from attemptNumber because the first attempt does not count as a retry\n\tconst retriesLeft = options.retries - (attemptNumber - 1);\n\n\terror.attemptNumber = attemptNumber;\n\terror.retriesLeft = retriesLeft;\n\treturn error;\n};\n\nexport default async function pRetry(input, options) {\n\treturn new Promise((resolve, reject) => {\n\t\toptions = {...options};\n\t\toptions.onFailedAttempt ??= () => {};\n\t\toptions.shouldRetry ??= () => true;\n\t\toptions.retries ??= 10;\n\n\t\tconst operation = retry.operation(options);\n\n\t\tconst abortHandler = () => {\n\t\t\toperation.stop();\n\t\t\treject(options.signal?.reason);\n\t\t};\n\n\t\tif (options.signal && !options.signal.aborted) {\n\t\t\toptions.signal.addEventListener('abort', abortHandler, {once: true});\n\t\t}\n\n\t\tconst cleanUp = () => {\n\t\t\toptions.signal?.removeEventListener('abort', abortHandler);\n\t\t\toperation.stop();\n\t\t};\n\n\t\toperation.attempt(async attemptNumber => {\n\t\t\ttry {\n\t\t\t\tconst result = await input(attemptNumber);\n\t\t\t\tcleanUp();\n\t\t\t\tresolve(result);\n\t\t\t} catch (error) {\n\t\t\t\ttry {\n\t\t\t\t\tif (!(error instanceof Error)) {\n\t\t\t\t\t\tthrow new TypeError(`Non-error was thrown: \"${error}\". You should only throw errors.`);\n\t\t\t\t\t}\n\n\t\t\t\t\tif (error instanceof AbortError) {\n\t\t\t\t\t\tthrow error.originalError;\n\t\t\t\t\t}\n\n\t\t\t\t\tif (error instanceof TypeError && !isNetworkError(error)) {\n\t\t\t\t\t\tthrow error;\n\t\t\t\t\t}\n\n\t\t\t\t\tdecorateErrorWithCounts(error, attemptNumber, options);\n\n\t\t\t\t\tif (!(await options.shouldRetry(error))) {\n\t\t\t\t\t\toperation.stop();\n\t\t\t\t\t\treject(error);\n\t\t\t\t\t}\n\n\t\t\t\t\tawait options.onFailedAttempt(error);\n\n\t\t\t\t\tif (!operation.retry(error)) {\n\t\t\t\t\t\tthrow operation.mainError();\n\t\t\t\t\t}\n\t\t\t\t} catch (finalError) {\n\t\t\t\t\tdecorateErrorWithCounts(finalError, attemptNumber, options);\n\t\t\t\t\tcleanUp();\n\t\t\t\t\treject(finalError);\n\t\t\t\t}\n\t\t\t}\n\t\t});\n\t});\n}\n","const objectToString = Object.prototype.toString;\n\nconst isError = value => objectToString.call(value) === '[object Error]';\n\nconst errorMessages = new Set([\n\t'network error', // Chrome\n\t'Failed to fetch', // Chrome\n\t'NetworkError when attempting to fetch resource.', // Firefox\n\t'The Internet connection appears to be offline.', // Safari 16\n\t'Load failed', // Safari 17+\n\t'Network request failed', // `cross-fetch`\n\t'fetch failed', // Undici (Node.js)\n\t'terminated', // Undici (Node.js)\n]);\n\nexport default function isNetworkError(error) {\n\tconst isValid = error\n\t\t&& isError(error)\n\t\t&& error.name === 'TypeError'\n\t\t&& typeof error.message === 'string';\n\n\tif (!isValid) {\n\t\treturn false;\n\t}\n\n\t// We do an extra check for Safari 17+ as it has a very generic error message.\n\t// Network errors in Safari have no stack.\n\tif (error.message === 'Load failed') {\n\t\treturn error.stack === undefined;\n\t}\n\n\treturn errorMessages.has(error.message);\n}\n","/**\n * Cookie parsing and formatting utilities\n */\n\n/**\n * Parses a cookie string into a key-value object\n * @param cookieString - Cookie string to parse (format: \"name1=value1; name2=value2\")\n * @returns Object with cookie names as keys and values as values\n */\nexport const parseCookiesString = (cookieString: string): Record<string, string> =>\n cookieString\n .split(';')\n .map((pair) => {\n const [name, value] = pair.trim().split('=')\n return [name?.trim(), value?.trim()]\n })\n .filter(([name, value]) => name && value)\n .reduce<Record<string, string>>(\n (acc, [name, value]) => ({ ...acc, [name]: value }),\n {}\n )\n\n/**\n * Formats a cookie object into a cookie string\n * @param cookies - Object with cookie names and values\n * @returns Cookie string in format \"name1=value1;name2=value2\"\n */\nexport const formatCookies = (cookies: Record<string, string>): string =>\n Object.entries(cookies)\n .map(([name, value]) => `${name}=${value}`)\n .join(';')","/**\n * Bilibili WBI (Web Broadcast Interface) signature implementation\n * Used for signing API requests to Bilibili\n */\nimport md5 from 'md5'\n\n/**\n * Encoding table for mixin key generation\n * This is part of Bilibili's WBI signing algorithm\n */\nconst MIXIN_KEY_ENCODING_TAB = [\n 46, 47, 18, 2, 53, 8, 23, 32, 15, 50, 10, 31, 58, 3, 45, 35, 27, 43, 5, 49,\n 33, 9, 42, 19, 29, 28, 14, 39, 12, 38, 41, 13, 37, 48, 7, 16, 24, 55, 40, 61,\n 26, 17, 0, 1, 60, 51, 30, 4, 22, 25, 54, 21, 56, 59, 6, 63, 57, 62, 11, 36,\n 20, 34, 44, 52\n]\n\n/**\n * Generates mixin key from original string using encoding table\n * @param orig - Original string to encode\n * @returns Encoded mixin key (first 32 characters)\n */\nconst getMixinKey = (orig: string) =>\n MIXIN_KEY_ENCODING_TAB.map((n) => orig[n])\n .join('')\n .slice(0, 32)\n\n/**\n * Encodes parameters using Bilibili's WBI signing algorithm\n * @param originParams - Original parameters to sign\n * @param img_key - Image key from Bilibili WBI endpoint\n * @param sub_key - Sub key from Bilibili WBI endpoint\n * @returns Signed query string with w_rid parameter\n */\nexport const encodeWbi = (\n originParams: Record<string, string | number>,\n img_key: string,\n sub_key: string\n) => {\n // Generate mixin key from img_key and sub_key\n const mixin_key = getMixinKey(img_key + sub_key)\n const curr_time = Math.round(Date.now() / 1000)\n const chr_filter = /[!'()*]/g\n \n // Add timestamp to parameters\n const params = Object.assign({}, originParams, { wts: curr_time })\n \n // Create sorted query string with filtered values\n const query = Object.keys(params)\n .sort()\n .map((key) => {\n const value = params[key].toString().replace(chr_filter, '')\n\n return `${encodeURIComponent(key)}=${encodeURIComponent(value)}`\n })\n .join('&')\n \n // Generate WBI signature\n const wbi_sign = md5(query + mixin_key)\n\n return query + '&w_rid=' + wbi_sign\n}","/**\n * Bilibili API client for video metadata extraction\n * Handles authentication, WBI signing, and API requests\n */\nimport { APIClient } from '../utils/http'\nimport { Resolution } from '../types'\nimport { parseCookiesString, formatCookies } from '../utils/cookie'\nimport { encodeWbi } from './wbi-sign'\n\n/**\n * Bilibili video view information structure\n */\ninterface VideoViewInfo {\n aid: number\n cid: number\n desc: string\n title: string\n duration: number\n pic: string\n}\n\n/**\n * Bilibili subtitle information structure\n */\ninterface Subtitle {\n lan_doc: string\n subtitle_url: string\n}\n\n/**\n * Mapping of resolution strings to Bilibili quality codes\n */\nconst RESOLUTION_CODE: Record<Resolution, number> = {\n '4k': 120,\n '1080p': 80,\n '720p': 64,\n '360p': 16\n}\n\n/**\n * Bilibili API client for video operations\n */\nexport class BilibiliClient {\n private apiClient: APIClient\n\n /**\n * Creates a new Bilibili client\n * @param cookies - Authentication cookies\n */\n constructor(private cookies: Record<string, string> = {}) {\n const cookieString = formatCookies(cookies)\n\n this.apiClient = new APIClient('https://api.bilibili.com', {\n init: {\n headers: { cookie: cookieString }\n }\n })\n }\n\n /**\n * Checks if user is logged in based on SESSDATA cookie\n */\n get isLogin() {\n return !!this.cookies.SESSDATA\n }\n\n /**\n * Fetches video URL based on login status\n * @param bvid - Bilibili video ID\n * @param cid - Video CID\n * @param resolution - Desired resolution\n * @param isPreview - Whether this is for preview\n * @returns Video URL and quality info\n */\n private fetchVideo(\n bvid: string,\n cid: number,\n resolution: Resolution,\n isPreview = false\n ) {\n if (this.isLogin) {\n return this.getHighResolutionDownloadURL(bvid, cid, resolution, isPreview)\n }\n\n return this.getLowResolutionDownloadURL(bvid, cid)\n }\n\n /**\n * Gets WBI signing keys from Bilibili API\n * @returns Object containing img_key and sub_key for WBI signing\n */\n async getWbiKeys() {\n const response = await this.apiClient.send('/x/web-interface/nav')\n const {\n data: {\n wbi_img: { img_url, sub_url }\n }\n } = await response.json()\n\n return {\n img_key: img_url.slice(\n img_url.lastIndexOf('/') + 1,\n img_url.lastIndexOf('.')\n ),\n sub_key: sub_url.slice(\n sub_url.lastIndexOf('/') + 1,\n sub_url.lastIndexOf('.')\n )\n }\n }\n\n /**\n * Signs API parameters using WBI algorithm\n * @param params - Parameters to sign\n * @returns Signed query string\n */\n async signParams(params: Record<string, string | number>) {\n const { img_key, sub_key } = await this.getWbiKeys()\n\n return encodeWbi(params, img_key, sub_key)\n }\n\n /**\n * Gets basic video information\n * @param bvid - Bilibili video ID\n * @returns Video view information\n */\n async getInfo(bvid: string): Promise<VideoViewInfo> {\n const response = await this.apiClient.send(\n `/x/web-interface/view?bvid=${bvid}`\n )\n const { data } = await response.json()\n\n return data\n }\n\n /**\n * Gets available subtitles for a video\n * @param aid - Video AID\n * @param cid - Video CID\n * @returns Array of available subtitles\n */\n async getSubtitles(aid: number, cid: number): Promise<Subtitle[]> {\n const response = await this.apiClient.send(\n `/x/player/wbi/v2?aid=${aid}&cid=${cid}`\n )\n const { data } = await response.json()\n\n return data.subtitle?.subtitles ?? []\n }\n\n /**\n * Gets preview URL for a video\n * @param bvid - Bilibili video ID\n * @param cid - Video CID\n * @returns Preview URL and quality info\n */\n async getPreviewURL(bvid: string, cid: number) {\n return this.fetchVideo(bvid, cid, '1080p', true)\n }\n\n async getLowResolutionDownloadURL(bvid: string, cid: number) {\n const signedParams = await this.signParams({\n bvid,\n cid,\n otype: 'json',\n platform: 'html5'\n })\n const response = await this.apiClient.send(\n `/x/player/wbi/playurl?${signedParams}`\n )\n\n const { data } = await response.json()\n\n return {\n url: data.durl?.[0]?.url ?? data.durl?.[0]?.backup_url?.[0],\n quality: data.quality\n }\n }\n\n async getHighResolutionDownloadURL(\n bvid: string,\n cid: number,\n resolution: Resolution,\n isPreview?: boolean\n ) {\n const signedParams = await this.signParams({\n bvid,\n cid,\n otype: 'json',\n qn: RESOLUTION_CODE[resolution].toString() ?? '80',\n high_quality: ['4k', '1080p'].includes(resolution) ? '1' : '0'\n })\n const resolution4KParams =\n resolution === '4k' ? '&fnval&128=128&fourk=1' : ''\n const platform = isPreview ? '&platform=html5' : ''\n const response = await this.apiClient.send(\n `/x/player/wbi/playurl?${signedParams}${resolution4KParams}${platform}`\n )\n const { data } = await response.json()\n\n return {\n url: data.durl?.[0]?.url,\n quality: data.quality\n }\n }\n\n /**\n * Gets download URL for a video with quality validation\n * @param bvid - Bilibili video ID\n * @param cid - Video CID\n * @param resolution - Desired resolution\n * @returns Download URL\n */\n async getDownloadURL(bvid: string, cid: number, resolution: Resolution) {\n const { url, quality } = await this.fetchVideo(bvid, cid, resolution)\n const expectedQuality = RESOLUTION_CODE[resolution].toString()\n\n // Warn if requested quality is not available\n if (expectedQuality && expectedQuality !== quality.toString()) {\n const label = Object.keys(RESOLUTION_CODE).find(\n (key) => RESOLUTION_CODE[key as Resolution] === quality\n )\n\n console.warn(\n `The requested resolution is not available, using ${label ?? 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await parseSubtitles(subtitle.subtitle_url)\n : undefined;\n \n // Get download and preview URLs in parallel\n const [downloadURL, { url: previewURL }] = await Promise.all([\n bilibiliClient.getDownloadURL(bvid, cid, resolution),\n bilibiliClient.getPreviewURL(bvid, cid),\n ]);\n\n return {\n title,\n website: \"bilibili\",\n subtitles: subtitleContent,\n duration,\n videoId: bvid,\n url,\n thumbnail: pic,\n description: desc,\n previewURL,\n downloadURL,\n fps: 25,\n };\n};\n","/**\n * YouTube video metadata extractor\n * Handles video information retrieval from YouTube platform using youtubei.js\n */\nimport { ClientType, Innertube, UniversalCache } from \"youtubei.js\";\nimport { getVideoIdByURL } from \"../utils/common\";\nimport { APIClient } from \"../utils/http\";\nimport { XMLParser } from \"fast-xml-parser\";\nimport {\n DownloadFormat,\n SubTitles,\n VideoMetadata,\n ExtractorOptions,\n} from \"../types\";\nimport { formatCookies } from \"../utils/cookie\";\nimport pRetry from \"p-retry\";\nimport { isNodeJS } from \"@/utils/browser\";\n\n/**\n * YouTube subtitle XML item structure\n */\ninterface SubTitleXMLItem {\n content: string;\n start: string;\n dur: string;\n}\n\n/**\n * Creates a custom fetch function for YouTube requests\n * Modifies requests to work with YouTube API\n */\nconst createFetchFn = () => (input: RequestInfo | URL, init?: RequestInit) => {\n const url =\n typeof input === \"string\"\n ? 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