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Allow returning page if transcript extraction failed

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This commit is contained in:
Cohee 2024-10-04 01:12:12 +03:00
parent 6cb82fc21e
commit 777b2518bd
1 changed files with 75 additions and 57 deletions
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132
src/endpoints/search.js
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@ -22,6 +22,72 @@ const visitHeaders = {
'Sec-Fetch-User': '?1',
};
/**
* Extract the transcript of a YouTube video
* @param {string} videoPageBody HTML of the video page
* @param {string} lang Language code
* @returns {Promise<string>} Transcript text
*/
async function extractTranscript(videoPageBody, lang) {
const he = require('he');
const RE_XML_TRANSCRIPT = /<text start="([^"]*)" dur="([^"]*)">([^<]*)<\/text>/g;
const splittedHTML = videoPageBody.split('"captions":');
if (splittedHTML.length <= 1) {
if (videoPageBody.includes('class="g-recaptcha"')) {
throw new Error('Too many requests');
}
if (!videoPageBody.includes('"playabilityStatus":')) {
throw new Error('Video is not available');
}
throw new Error('Transcript not available');
}
const captions = (() => {
try {
return JSON.parse(splittedHTML[1].split(',"videoDetails')[0].replace('\n', ''));
} catch (e) {
return undefined;
}
})()?.['playerCaptionsTracklistRenderer'];
if (!captions) {
throw new Error('Transcript disabled');
}
if (!('captionTracks' in captions)) {
throw new Error('Transcript not available');
}
if (lang && !captions.captionTracks.some(track => track.languageCode === lang)) {
throw new Error('Transcript not available in this language');
}
const transcriptURL = (lang ? captions.captionTracks.find(track => track.languageCode === lang) : captions.captionTracks[0]).baseUrl;
const transcriptResponse = await fetch(transcriptURL, {
headers: {
...(lang && { 'Accept-Language': lang }),
'User-Agent': visitHeaders['User-Agent'],
},
});
if (!transcriptResponse.ok) {
throw new Error('Transcript request failed');
}
const transcriptBody = await transcriptResponse.text();
const results = [...transcriptBody.matchAll(RE_XML_TRANSCRIPT)];
const transcript = results.map((result) => ({
text: result[3],
duration: parseFloat(result[2]),
offset: parseFloat(result[1]),
lang: lang ?? captions.captionTracks[0].languageCode,
}));
// The text is double-encoded
const transcriptText = transcript.map((line) => he.decode(he.decode(line.text))).join(' ');
return transcriptText;
}
router.post('/serpapi', jsonParser, async (request, response) => {
try {
const key = readSecret(request.user.directories, SECRET_KEYS.SERPAPI);
@ -56,8 +122,6 @@ router.post('/serpapi', jsonParser, async (request, response) => {
*/
router.post('/transcript', jsonParser, async (request, response) => {
try {
const he = require('he');
const RE_XML_TRANSCRIPT = /<text start="([^"]*)" dur="([^"]*)">([^<]*)<\/text>/g;
const id = request.body.id;
const lang = request.body.lang;
const json = request.body.json;
@ -75,64 +139,18 @@ router.post('/transcript', jsonParser, async (request, response) => {
});
const videoPageBody = await videoPageResponse.text();
const splittedHTML = videoPageBody.split('"captions":');
if (splittedHTML.length <= 1) {
if (videoPageBody.includes('class="g-recaptcha"')) {
throw new Error('Too many requests');
try {
const transcriptText = await extractTranscript(videoPageBody, lang);
return json
? response.json({ transcript: transcriptText, html: videoPageBody })
: response.send(transcriptText);
} catch (error) {
if (json) {
return response.json({ html: videoPageBody, transcript: '' });
}
if (!videoPageBody.includes('"playabilityStatus":')) {
throw new Error('Video is not available');
}
throw new Error('Transcript not available');
throw error;
}
const captions = (() => {
try {
return JSON.parse(splittedHTML[1].split(',"videoDetails')[0].replace('\n', ''));
} catch (e) {
return undefined;
}
})()?.['playerCaptionsTracklistRenderer'];
if (!captions) {
throw new Error('Transcript disabled');
}
if (!('captionTracks' in captions)) {
throw new Error('Transcript not available');
}
if (lang && !captions.captionTracks.some(track => track.languageCode === lang)) {
throw new Error('Transcript not available in this language');
}
const transcriptURL = (lang ? captions.captionTracks.find(track => track.languageCode === lang) : captions.captionTracks[0]).baseUrl;
const transcriptResponse = await fetch(transcriptURL, {
headers: {
...(lang && { 'Accept-Language': lang }),
'User-Agent': visitHeaders['User-Agent'],
},
});
if (!transcriptResponse.ok) {
throw new Error('Transcript request failed');
}
const transcriptBody = await transcriptResponse.text();
const results = [...transcriptBody.matchAll(RE_XML_TRANSCRIPT)];
const transcript = results.map((result) => ({
text: result[3],
duration: parseFloat(result[2]),
offset: parseFloat(result[1]),
lang: lang ?? captions.captionTracks[0].languageCode,
}));
// The text is double-encoded
const transcriptText = transcript.map((line) => he.decode(he.decode(line.text))).join(' ');
return json
? response.json({ transcript: transcriptText, html: videoPageBody })
: response.send(transcriptText);
} catch (error) {
console.log(error);
return response.sendStatus(500);