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{ fetch } from \"https://esm.town/v/std/fetch\";\n\nexport const YoutubeTranscript = async (url: string, metadata = true) => {\n const RE_YOUTUBE =\n /(?:youtube\\.com\\/(?:[^\\/]+\\/.+\\/|(?:v|e(?:mbed)?)\\/|.*[?&]v=)|youtu\\.be\\/)([^\"&?\\/\\s]{11})/i;\n const YouTubeKey = {\n apiKey: \"INNERTUBE_API_KEY\",\n serializedShareEntity: \"serializedShareEntity\",\n visitorData: \"VISITOR_DATA\",\n sessionId: \"sessionId\",\n clickTrackingParams: \"clickTrackingParams\",\n } as const;\n type ObjectValues = T[keyof T];\n type YouTubeKeyRaw = ObjectValues;\n class YoutubeTranscriptError extends Error {\n constructor(message: string) {\n super(`[YoutubeTranscript] 🚨 ${message}`);\n }\n }\n interface TranscriptConfig {\n lang?: string;\n country?: string;\n }\n interface TranscriptSegment {\n text: string;\n duration: number;\n offset: number;\n }\n interface TranscriptData {\n responseContext: {\n serviceTrackingParams: {\n service: string;\n params: {\n key: string;\n value: string;\n }[];\n }[];\n mainAppWebResponseContext: {\n loggedOut: boolean;\n trackingParam: string;\n };\n webResponseContextExtensionData: {\n hasDecorated: boolean;\n };\n };\n actions: {\n clickTrackingParams: string;\n updateEngagementPanelAction: {\n targetId: string;\n content: {\n transcriptRenderer: {\n body: {\n transcriptBodyRenderer: {\n cueGroups: {\n transcriptCueGroupRenderer: {\n formattedStartOffset: {\n simpleText: string;\n };\n cues: {\n transcriptCueRenderer: {\n cue: {\n simpleText: string;\n };\n startOffsetMs: string;\n durationMs: string;\n };\n }[];\n };\n }[];\n };\n };\n };\n };\n };\n }[];\n }\n /**\n * An extensible class to fetch a transcript from a given YouTube Video\n */\n class YoutubeTranscript {\n /**\n * Fetch a transcript from a YouTube Video which includes the text and timestamp metadata\n * @param videoId Video url or video identifier\n * @param config Options for specifying a Country and Language ISO\n */\n static async fetchTranscript(\n videoId: string,\n config?: TranscriptConfig,\n ): Promise {\n const identifier = this.extractVideoId(videoId);\n try {\n const textResponse = await fetch(\n `https://www.youtube.com/watch?v=${identifier}`,\n );\n const body = await textResponse.text();\n const apiKey = this.extractValue(body, YouTubeKey.apiKey);\n if (!apiKey || !apiKey.length) {\n throw new YoutubeTranscriptError(\n `Failed to extract ${YouTubeKey.apiKey}`,\n );\n }\n const transcriptResponse = await fetch(\n `https://www.youtube.com/youtubei/v1/get_transcript?key=${apiKey}`,\n {\n method: \"POST\",\n body: JSON.stringify(this.generateRequest(body, config)),\n headers: {\n \"content-type\": \"application/json\",\n },\n },\n );\n if (!transcriptResponse) {\n throw new YoutubeTranscriptError(\n \"Empty response from transcript endpoint\",\n );\n }\n const transcriptData = await transcriptResponse.json();\n return this.parseTranscriptData(transcriptData as TranscriptData);\n }\n catch (err) {\n throw new YoutubeTranscriptError(err);\n }\n }\n /**\n * Fetch only the transcript text from a YouTube Video\n * @param videoId Video url or video identifier\n * @param config Options for specifying a Country and Language ISO\n */\n static async fetchTranscriptText(\n videoId: string,\n config?: TranscriptConfig,\n ): Promise {\n const segments = await this.fetchTranscript(videoId, config);\n let out = \"\";\n for (const { text } of segments) {\n out += `${text} `;\n }\n return out.trimEnd();\n }\n /**\n * Parse TranscriptData from the \"get_transcript\" endpoint\n * @param transcriptData TranscriptData returned by the \"get_transcript\" endpoint\n */\n static parseTranscriptData(transcriptData: TranscriptData) {\n const { actions = [] } = transcriptData;\n const cueGroups =\n actions[0]?.updateEngagementPanelAction.content.transcriptRenderer.body\n .transcriptBodyRenderer.cueGroups;\n return cueGroups.map((cueGroup) => {\n const { cue, durationMs, startOffsetMs } =\n cueGroup.transcriptCueGroupRenderer.cues[0].transcriptCueRenderer;\n return {\n text: cue.simpleText,\n duration: parseInt(durationMs),\n offset: parseInt(startOffsetMs),\n };\n });\n }\n /**\n * Generate tracking params for YouTube API\n * @param page\n * @param config\n */\n static generateRequest(page: string, config?: TranscriptConfig) {\n const clientScreenNonce = this.generateNonce();\n const params = this.extractValue(page, YouTubeKey.serializedShareEntity);\n const visitorData = this.extractValue(page, YouTubeKey.visitorData);\n const sessionId = this.extractValue(page, YouTubeKey.sessionId);\n const clickTrackingParams = this.extractValue(\n page,\n YouTubeKey.clickTrackingParams,\n );\n return {\n context: {\n client: {\n hl: config?.lang || \"en\",\n gl: config?.country || \"US\",\n visitorData,\n userAgent:\n \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36,gzip(gfe)\",\n clientName: \"WEB\",\n clientVersion: \"2.20200925.01.00\",\n osName: \"Macintosh\",\n osVersion: \"10_15_4\",\n browserName: \"Chrome\",\n browserVersion: \"85.0f.4183.83\",\n screenWidthPoints: 1440,\n screenHeightPoints: 770,\n screenPixelDensity: 2,\n utcOffsetMinutes: 120,\n userInterfaceTheme: \"USER_INTERFACE_THEME_LIGHT\",\n connectionType: \"CONN_CELLULAR_3G\",\n },\n request: {\n sessionId,\n internalExperimentFlags: [],\n consistencyTokenJars: [],\n },\n user: {},\n clientScreenNonce,\n clickTracking: {\n clickTrackingParams,\n },\n },\n params,\n };\n }\n /**\n * Extract value from html page based on required key\n * @param page html page\n * @param key key name\n */\n static extractValue(page: string, key: YouTubeKeyRaw) {\n return page.split(`\"${key}\":\"`)[1]?.split(`\"`)[0];\n }\n /**\n * Extract video id from url or string\n * @param videoId video url or video id\n */\n static extractVideoId(videoId: string) {\n if (videoId.length === 11) {\n return videoId;\n }\n const matchId = videoId.match(RE_YOUTUBE);\n if (matchId && matchId.length) {\n return matchId[1];\n }\n throw new YoutubeTranscriptError(\"Malformed YouTube video url or ID.\");\n }\n /**\n * Generate nonce for clientScreenNonce as part of YouTube API\n */\n static generateNonce() {\n const rnd = Math.random().toString();\n const alphabet =\n \"ABCDEFGHIJKLMOPQRSTUVWXYZabcdefghjijklmnopqrstuvwxyz0123456789\";\n const jda = [\n alphabet + \"+/=\",\n alphabet + \"+/\",\n alphabet + \"-_=\",\n alphabet + \"-_.\",\n alphabet + \"-_\",\n ];\n const b = jda[3];\n const a = [];\n for (let i = 0; i < rnd.length - 1; i++) {\n a.push(rnd[i].charCodeAt(i));\n }\n let c = \"\";\n let d = 0;\n let m, n, q, r, f, g;\n while (d < a.length) {\n f = a[d];\n g = d + 1 < a.length;\n if (g) {\n m = a[d + 1];\n }\n else {\n m = 0;\n }\n n = d + 2 < a.length;\n if (n) {\n q = a[d + 2];\n }\n else {\n q = 0;\n }\n r = f >> 2;\n f = ((f & 3) << 4) | (m >> 4);\n m = ((m & 15) << 2) | (q >> 6);\n q &= 63;\n if (!n) {\n q = 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