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Update to new YouTube API

This commit is contained in:
Mattéo Delabre 2020-07-15 19:14:31 +02:00
parent 8bd77e09e5
commit e7d87e3bbd
Signed by: matteo
GPG Key ID: AE3FBD02DC583ABB
5 changed files with 150 additions and 171 deletions
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143
explore/api.js
View File

@ -5,20 +5,24 @@ const request = require('request');
const cheerio = require('cheerio'); const cheerio = require('cheerio');
const YOUTUBE_BASE = 'https://www.youtube.com/%s'; const YOUTUBE_BASE = 'https://www.youtube.com/%s';
const WATCH_BASE = util.format(YOUTUBE_BASE, 'watch?v=%s');
const VIDEO_ID_REGEX = /watch\?v=([^&]*)/i; const VIDEO_ID_REGEX = /watch\?v=([^&]*)/i;
const END_SCREEN_BASE = util.format(YOUTUBE_BASE, 'get_endscreen?v=%s'); // const END_SCREEN_BASE = util.format(YOUTUBE_BASE, 'get_endscreen?v=%s');
const CARD_BASE = util.format(YOUTUBE_BASE, 'annotations_invideo?video_id=%s'); // const CARD_BASE = util.format(YOUTUBE_BASE, 'annotations_invideo?video_id=%s');
const playerRegex = /ytplayer\.config = (\{.*?\});/;
/** /**
* Récupère une liste des vidéos liées à la fin d’une autre vidéo. * Fetch the `ytplayer.config` object for a YouTube video.
* *
* @param videoId Identifiant de la vidéo source. * @async
* @return Liste des vidéos liées. Chaque vidéo est un objet contenant * @param videoId Identifier of the video to fetch.
* son identifiant (videoId) et son titre (title). * @return The player configuration object.
*/ */
const getEndScreenVideos = videoId => const getPlayerConfig = videoId =>
{ {
const url = util.format(END_SCREEN_BASE, videoId); const url = util.format(WATCH_BASE, videoId);
return new Promise((resolve, reject) => return new Promise((resolve, reject) =>
{ {
@ -30,87 +34,84 @@ const getEndScreenVideos = videoId =>
return; return;
} }
// Suppression des caractères initiaux inutiles si applicable // Look for the definition of ytplayer.config and unserialize it
if (body.substr(0, 3) === ')]}') // and the player_response subobject
try
{ {
body = body.substr(3); const playerConfig = JSON.parse(body.match(playerRegex)[1]);
playerConfig.args.player_response
= JSON.parse(playerConfig.args.player_response);
resolve(playerConfig);
} }
catch (err)
// Interprétation du JSON
const data = JSON.parse(body);
// Aucun écran de fin
if (
typeof data !== 'object' || data === null ||
data.elements === undefined
)
{ {
resolve([]); reject(err);
return;
} }
// Filtrage des données pour extraire le titre et l’ID des vidéos
resolve(data.elements.map(elt =>
{
const data = elt.endscreenElementRenderer;
const videoIdResults = VIDEO_ID_REGEX.exec(
data.endpoint.urlEndpoint.url
);
return {
videoId: videoIdResults ? videoIdResults[1] : null,
title: data.title.simpleText,
};
}));
}); });
}); });
}; };
exports.getPlayerConfig = getPlayerConfig;
/**
* Get metadata about a YouTube video.
*
* @param playerConfig The `ytplayer.config` object corresponding to the source
* YouTube video, as obtained from `getPlayerConfig`.
* @return Object containing the video metadata.
*/
const getVideoMeta = playerConfig => ({
videoId: playerConfig.args.player_response.videoDetails.videoId,
title: playerConfig.args.player_response.videoDetails.title,
});
exports.getVideoMeta = getVideoMeta;
/**
* Find videos linked from the endscreen of a YouTube video.
*
* @param playerConfig The `ytplayer.config` object corresponding to the source
* YouTube video, as obtained from `getPlayerConfig`.
* @return List of identifiers of linked videos.
*/
const getEndScreenVideos = playerConfig =>
{
const response = playerConfig.args.player_response;
if (!('endscreen' in response))
{
return [];
}
return response.endscreen.endscreenRenderer.elements
.map(elt => elt.endscreenElementRenderer)
.filter(rdr => 'watchEndpoint' in rdr.endpoint)
.map(rdr => rdr.endpoint.watchEndpoint.videoId);
};
exports.getEndScreenVideos = getEndScreenVideos; exports.getEndScreenVideos = getEndScreenVideos;
/** /**
* Récupère une liste des vidéos liées en tant que carte d’une autre vidéo. * Find videos linked from as cards from a YouTube video.
* *
* @param videoId Identifiant de la vidéo source. * @param playerConfig The `ytplayer.config` object corresponding to the source
* @return Liste des vidéos liées. Chaque vidéo est un objet contenant * YouTube video, as obtained from `getPlayerConfig`.
* son identifiant (videoId) et son titre (title). * @return List of identifiers of linked videos.
*/ */
const getCardVideos = videoId => const getCardVideos = playerConfig =>
{ {
const url = util.format(CARD_BASE, videoId); const response = playerConfig.args.player_response;
return new Promise((resolve, reject) => if (!('cards' in response))
{ {
request(url, (err, res, body) => return [];
{
if (err)
{
reject(err);
return;
} }
// Interprétation du XML externe et recherche des annotations return response.cards.cardCollectionRenderer.cards
// de type carte .map(card => card.cardRenderer.content)
const nav = cheerio.load(body); .filter(content => 'videoInfoCardContentRenderer' in content)
const cards = nav('annotation[type="card"][style="video"]'); .map(content => content.videoInfoCardContentRenderer)
const list = []; .map(rdr => rdr.action.watchEndpoint.videoId);
cards.each((i, el) =>
{
// Interprétation du JSON de chaque carte, extraction
// du titre et de l’identifiant de la vidéo
const data = JSON.parse(nav(el).children('data').text());
const videoIdResults = VIDEO_ID_REGEX.exec(data.url);
list.push({
title: data.title,
videoId: videoIdResults ? videoIdResults[1] : null
});
});
resolve(list);
});
});
}; };
exports.getCardVideos = getCardVideos; exports.getCardVideos = getCardVideos;

16
explore/graph.js
View File

@ -7,19 +7,19 @@ const GRAPH_NODE_URL = ' "%s" [label="%s", URL="%s", fontcolor=blue]';
const GRAPH_LINK = ' "%s" -> "%s"'; const GRAPH_LINK = ' "%s" -> "%s"';
/** /**
* Convertit un graphe en format DOT. * Convert a graph to the DOT format.
* *
* @param graph Graphe à convertir. * @param graph Graph to convert.
* @param [title=identity] Fonction donnant le titre de chaque nœud du graphe. * @param [title=identity] Function giving the name of each node.
* @param [url=none] Fonction donnant l’URL de chaque nœud du graphe, ou la * @param [url=none] Function given the URL of each node, or an empty string
* chaîne vide si un nœud n’a pas d’URL. * if a node has no URL.
* @return Représentation DOT du graphe. * @return DOT representation of the graph.
*/ */
const graphToDOT = (graph, title = id => id, url = () => '') => const graphToDOT = (graph, title = id => id, url = () => '') =>
{ {
const ser = graph.serialize(); const ser = graph.serialize();
// Conversion des nœuds de vidéo // Convert nodes
const nodes = ser.nodes.map(({id}) => const nodes = ser.nodes.map(({id}) =>
{ {
const nodeTitle = title(id); const nodeTitle = title(id);
@ -36,7 +36,7 @@ const graphToDOT = (graph, title = id => id, url = () => '') =>
} }
).join('\n'); ).join('\n');
// Conversion des liens de vidéo // Convert edges
const links = ser.links.map(({source, target}) => const links = ser.links.map(({source, target}) =>
util.format(GRAPH_LINK, source, target) util.format(GRAPH_LINK, source, target)
).join('\n'); ).join('\n');

65
explore/index.js
View File

@ -5,74 +5,59 @@ const fs = require('fs');
const path = require('path'); const path = require('path');
const util = require('util'); const util = require('util');
const {getEndScreenVideos, getCardVideos} = require('./api'); const api = require('./api');
const {graphToDOT} = require('./graph'); const {graphToDOT} = require('./graph');
const YOUTUBE_WATCH = 'https://youtu.be/%s'; const YOUTUBE_WATCH = 'https://youtu.be/%s';
// Récupère le chemin vers le fichier de sortie depuis la ligne de commande // Fetch the output path from command line
if (process.argv.length !== 3) if (process.argv.length !== 3)
{ {
console.error(`Utilisation : node src [sortie]`); console.error(`Usage: node explore [output]`);
process.exit(1); process.exit(1);
} }
const dest = process.argv[2]; const dest = process.argv[2];
// Graphe des vidéos. Chaque nœud est une vidéo, et est liée à toutes // Graph of visited videos. Each node is a video which is linked to all the
// les vidéos vers lesquelles elle a un lien (par carte ou écran de fin) // videos to which there is a link, either through a card or an endscreen item
const videosGraph = Graph(); const videosGraph = Graph();
// Stocke les métadonnées de chaque vidéo // Store metadata about each visited video
const videosMeta = Object.create(null); const videosMeta = Object.create(null);
// Se souvient des vidéos déja visitées
const visitedVideos = Object.create(null);
/** /**
* Explore récursivement les liens d’une vidéo pour remplir le graphe * Recursively explore a video and the video linked from it to fill
* des vidéos. * the video graph.
* *
* @param videoId Identifiant de la vidéo source. * @param videoId Source video identifier.
*/ */
const exploreVideo = videoId => const exploreVideo = async videoId =>
{ {
// S’assure de ne pas visiter deux fois la même vidéo // Make sure we don’t explore the same video twice
if (visitedVideos[videoId] === true) if (videoId in videosMeta)
{ {
return Promise.resolve(); return Promise.resolve();
} }
visitedVideos[videoId] = true; const playerConfig = await api.getPlayerConfig(videoId);
videosMeta[videoId] = api.getVideoMeta(playerConfig);
return Promise.all([ const linkedVideos = [
getEndScreenVideos(videoId), ...api.getEndScreenVideos(playerConfig),
getCardVideos(videoId) ...api.getCardVideos(playerConfig),
]).then(results => ];
{
const videos = [].concat(...results);
const ids = videos.map(video => video.videoId);
// Ajout des vidéos liées dans les métadonnées // Add links between this video and the linked ones
videos.forEach(video => videosMeta[video.videoId] = video); linkedVideos.forEach(id => videosGraph.addEdge(videoId, id));
// Ajout des liens entre la vidéo et ses vidéos liées // Recurse on linked videos
ids.forEach(id => videosGraph.addEdge(videoId, id)); return Promise.all(linkedVideos.map(id => exploreVideo(id)));
// Récursion sur les vidéos non-explorées
return Promise.all(ids.map(id => exploreVideo(id)));
});
}; };
// Métadonnées de la vidéo source // Metadata of the source video
const rootVideoId = 'EZGra6O8ClQ'; const rootVideoId = 'EZGra6O8ClQ';
videosMeta[rootVideoId] = { console.log('Starting to explore!');
title: '1 avril 2017 : présentation des règles',
videoId: rootVideoId,
links: []
};
console.log('Démarrage de l’exploration !');
exploreVideo(rootVideoId).then(() => exploreVideo(rootVideoId).then(() =>
{ {
@ -85,5 +70,5 @@ exploreVideo(rootVideoId).then(() =>
) )
); );
console.log('Terminé. Résultat dans ' + dest); console.log('Finished. Result in ' + dest);
}).catch(console.error); }).catch(console.error);

91
package-lock.json generated
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@ -10,11 +10,11 @@
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@ -44,9 +44,9 @@
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@ -177,14 +177,14 @@
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@ -210,9 +210,9 @@
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@ -298,21 +298,21 @@
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@ -342,9 +342,9 @@
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@ -367,9 +367,9 @@
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@ -378,7 +378,7 @@
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@ -388,7 +388,7 @@
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@ -428,19 +428,12 @@
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@ -470,9 +463,9 @@
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4
package.json
View File

@ -9,7 +9,7 @@
}, },
"dependencies": { "dependencies": {
"cheerio": "1.0.0-rc.3", "cheerio": "1.0.0-rc.3",
"graph-data-structure": "^1.8.0", "graph-data-structure": "^1.12.1",
"request": "^2.88.0" "request": "^2.88.2"
} }
} }