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scraper.js
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scraper.js
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const cheerio = require('cheerio');
const request = require('request');
async function youtube(query, page) {
return new Promise((resolve, reject) => {
// Specify YouTube search url
let url = `https://www.youtube.com/results?q=${encodeURIComponent(query)}${page ? `&page=${page}` : ''}`;
// Access YouTube search
request(url, (error, response, html) => {
// Check for errors
if (!error && response.statusCode === 200) {
const $ = cheerio.load(html);
let json = { results: [], version: require('./package.json').version };
// First attempt to parse old youtube search result style
$(".yt-lockup-dismissable").each((index, vid) => {
json["parser"] = "html_format";
json.results.push(parseOldFormat($, vid));
});
// If that fails, we have to parse new format from json data in html script tag
if (!json.results.length) {
json["parser"] = "json_format";
// Get script json data from html to parse
let data = html.substring(html.indexOf("ytInitialData") + 17);
data = JSON.parse(data.substring(0, data.indexOf('window["ytInitialPlayerResponse"]') - 6));
json["estimatedResults"] = data.estimatedResults || "0";
let sectionLists = data.contents.twoColumnSearchResultsRenderer.primaryContents.sectionListRenderer.contents;
// Loop through all objects and parse data according to type
sectionLists.forEach(sectionList => {
sectionList.itemSectionRenderer.contents.forEach(content => {
try {
if (content.hasOwnProperty("channelRenderer")) {
json.results.push(parseChannelRenderer(content.channelRenderer));
}
if (content.hasOwnProperty("videoRenderer")) {
json.results.push(parseVideoRenderer(content.videoRenderer));
}
if (content.hasOwnProperty("radioRenderer")) {
json.results.push(parseRadioRenderer(content.radioRenderer));
}
if (content.hasOwnProperty("playlistRenderer")) {
json.results.push(parsePlaylistRenderer(content.playlistRenderer));
}
}
catch(ex) {
console.log(ex);
console.log(content);
}
});
});
}
return resolve(json);
}
resolve({ error: error });
});
});
}
/**
* Parse youtube search results from dom elements
* @param {CheerioStatic} $ - The youtube search results loaded with cheerio
* @param {CheerioElement} vid - The current video being parsed
* @returns object with data to return for this video
*/
function parseOldFormat($, vid) {
// Get video details
let $metainfo = $(vid).find(".yt-lockup-meta-info li");
let $thumbnail = $(vid).find(".yt-thumb img");
let video = {
"id": $(vid).parent().data("context-item-id"),
"title": $(vid).find(".yt-lockup-title").children().first().text(),
"url": `https://www.youtube.com${$(vid).find(".yt-lockup-title").children().first().attr("href")}`,
"duration": $(vid).find(".video-time").text().trim() || "Playlist",
"snippet": $(vid).find(".yt-lockup-description").text(),
"upload_date": $metainfo.first().text(),
"thumbnail_src": $thumbnail.data("thumb") || $thumbnail.attr("src"),
"views": $metainfo.last().text()
};
// Get user details
let $byline = $(vid).find(".yt-lockup-byline");
let uploader = {
"username": $byline.text(),
"url": `https://www.youtube.com${$byline.find("a").attr("href")}`,
"verified": !!$byline.find("[title=Verified]").length
};
// Return json
return { video: video, uploader: uploader };
}
/**
* Parse a channelRenderer object from youtube search results
* @param {object} renderer - The channel renderer
* @returns object with data to return for this channel
*/
function parseChannelRenderer(renderer) {
let channel = {
"id": renderer.channelId,
"title": renderer.title.simpleText,
"url": `https://www.youtube.com${renderer.navigationEndpoint.commandMetadata.webCommandMetadata.url}`,
"snippet": renderer.descriptionSnippet ? renderer.descriptionSnippet.runs.reduce(comb, "") : "",
"thumbnail_src": renderer.thumbnail.thumbnails[renderer.thumbnail.thumbnails.length - 1].url,
"video_count": renderer.videoCountText ? renderer.videoCountText.runs.reduce(comb, "") : "",
"subscriber_count": renderer.subscriberCountText ? renderer.subscriberCountText.simpleText : "0 subscribers",
"verified": renderer.ownerBadges &&
renderer.ownerBadges.some(badge => badge.metadataBadgeRenderer.style.indexOf("VERIFIED") > -1) ||
false
};
return { channel };
}
/**
* Parse a playlistRenderer object from youtube search results
* @param {object} renderer - The playlist renderer
* @returns object with data to return for this playlist
*/
function parsePlaylistRenderer(renderer) {
let thumbnails = renderer.thumbnailRenderer.playlistVideoThumbnailRenderer.thumbnail.thumbnails;
let playlist = {
"id": renderer.playlistId,
"title": renderer.title.simpleText,
"url": `https://www.youtube.com${renderer.navigationEndpoint.commandMetadata.webCommandMetadata.url}`,
"thumbnail_src": thumbnails[thumbnails.length - 1].url,
"video_count": renderer.videoCount
};
let uploader = {
"username": renderer.shortBylineText.runs[0].text,
"url": `https://www.youtube.com${renderer.shortBylineText.runs[0].navigationEndpoint.commandMetadata.webCommandMetadata.url}`
};
return { playlist: playlist, uploader: uploader };
}
/**
* Parse a radioRenderer object from youtube search results
* @param {object} renderer - The radio renderer
* @returns object with data to return for this mix
*/
function parseRadioRenderer(renderer) {
let radio = {
"id": renderer.playlistId,
"title": renderer.title.simpleText,
"url": `https://www.youtube.com${renderer.navigationEndpoint.commandMetadata.webCommandMetadata.url}`,
"thumbnail_src": renderer.thumbnail.thumbnails[renderer.thumbnail.thumbnails.length - 1].url,
"video_count": renderer.videoCountText.runs.reduce(comb, "")
};
let uploader = {
"username": renderer.shortBylineText ? renderer.shortBylineText.simpleText : "YouTube"
};
return { radio: radio, uploader: uploader };
}
/**
* Parse a videoRenderer object from youtube search results
* @param {object} renderer - The video renderer
* @returns object with data to return for this video
*/
function parseVideoRenderer(renderer) {
let video = {
"id": renderer.videoId,
"title": renderer.title.runs.reduce(comb, ""),
"url": `https://www.youtube.com${renderer.navigationEndpoint.commandMetadata.webCommandMetadata.url}`,
"duration": renderer.lengthText ? renderer.lengthText.simpleText : "Live",
"snippet": renderer.descriptionSnippet ?
renderer.descriptionSnippet.runs.reduce((a, b) => a + (b.bold ? `<b>${b.text}</b>` : b.text), ""):
"",
"upload_date": renderer.publishedTimeText ? renderer.publishedTimeText.simpleText : "Live",
"thumbnail_src": renderer.thumbnail.thumbnails[renderer.thumbnail.thumbnails.length - 1].url,
"views": renderer.viewCountText ?
renderer.viewCountText.simpleText || renderer.viewCountText.runs.reduce(comb, "") :
(renderer.publishedTimeText ? "0 views" : "0 watching")
};
let uploader = {
"username": renderer.ownerText.runs[0].text,
"url": `https://www.youtube.com${renderer.ownerText.runs[0].navigationEndpoint.commandMetadata.webCommandMetadata.url}`
};
uploader.verified = renderer.ownerBadges &&
renderer.ownerBadges.some(badge => badge.metadataBadgeRenderer.style.indexOf("VERIFIED") > -1) ||
false;
return { video: video, uploader: uploader };
}
/**
* Combine array containing objects in format { text: "string" } to a single string
* For use with reduce function
* @param {string} a - Previous value
* @param {object} b - Current object
* @returns Previous value concatenated with new object text
*/
function comb(a, b) {
return a + b.text;
}
module.exports.youtube = youtube;