191 lines
5.1 KiB
Dart
191 lines
5.1 KiB
Dart
import 'dart:convert';
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import 'package:html/dom.dart';
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import 'package:html/parser.dart' as parser;
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import '../../../youtube_explode_dart.dart';
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import '../../extensions/helpers_extension.dart';
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import '../../retry.dart';
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import '../../videos/video_id.dart';
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import '../youtube_http_client.dart';
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import 'generated/player_response_json.g.dart';
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import 'generated/watch_page_id.g.dart';
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import 'player_response.dart';
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///
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class WatchPage {
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static final RegExp _videoLikeExp =
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RegExp(r'"label"\s*:\s*"([\d,\.]+) likes"');
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static final RegExp _videoDislikeExp =
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RegExp(r'"label"\s*:\s*"([\d,\.]+) dislikes"');
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static final RegExp _visitorInfoLiveExp =
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RegExp('VISITOR_INFO1_LIVE=([^;]+)');
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static final RegExp _yscExp = RegExp('YSC=([^;]+)');
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static final _xsfrTokenExp = RegExp(r'"XSRF_TOKEN"\s*:\s*"(.+?)"');
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final Document _root;
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///
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final String visitorInfoLive;
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///
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final String ysc;
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_InitialData _initialData;
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String _xsfrToken;
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_PlayerConfig _playerConfig;
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///
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_InitialData get initialData =>
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_initialData ??= _InitialData(WatchPageId.fromRawJson(_extractJson(
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_root
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.querySelectorAll('script')
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.map((e) => e.text)
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.toList()
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.firstWhere((e) => e.contains('window["ytInitialData"] =')),
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'window["ytInitialData"] =')));
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///
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String get xsfrToken => _xsfrToken ??= _xsfrTokenExp
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.firstMatch(_root
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.querySelectorAll('script')
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.firstWhere((e) => _xsfrTokenExp.hasMatch(e.text))
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.text)
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.group(1);
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///
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bool get isOk => _root.body.querySelector('#player') != null;
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///
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bool get isVideoAvailable =>
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_root.querySelector('meta[property="og:url"]') != null;
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///
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int get videoLikeCount => int.parse(_videoLikeExp
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.firstMatch(_root.outerHtml)
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?.group(1)
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?.stripNonDigits()
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?.nullIfWhitespace ??
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_root
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.querySelector('.like-button-renderer-like-button')
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?.text
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?.stripNonDigits()
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?.nullIfWhitespace ??
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'0');
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///
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int get videoDislikeCount => int.parse(_videoDislikeExp
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.firstMatch(_root.outerHtml)
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?.group(1)
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?.stripNonDigits()
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?.nullIfWhitespace ??
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_root
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.querySelector('.like-button-renderer-dislike-button')
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?.text
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?.stripNonDigits()
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?.nullIfWhitespace ??
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'0');
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static final _playerConfigExp = RegExp(r'ytplayer\.config\s*=\s*(\{.*\}\});');
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///
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_PlayerConfig get playerConfig => _playerConfig ??= _PlayerConfig(
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PlayerConfigJson.fromRawJson(_playerConfigExp
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.firstMatch(_root.getElementsByTagName('html').first.text)
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?.group(1)));
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String _extractJson(String html, String separator) {
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return _matchJson(
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html.substring(html.indexOf(separator) + separator.length));
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}
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String _matchJson(String str) {
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var bracketCount = 0;
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int lastI;
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for (var i = 0; i < str.length; i++) {
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lastI = i;
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if (str[i] == '{') {
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bracketCount++;
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} else if (str[i] == '}') {
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bracketCount--;
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} else if (str[i] == ';') {
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if (bracketCount == 0) {
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return str.substring(0, i);
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}
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}
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}
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return str.substring(0, lastI + 1);
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}
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///
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WatchPage(this._root, this.visitorInfoLive, this.ysc);
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///
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WatchPage.parse(String raw, this.visitorInfoLive, this.ysc)
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: _root = parser.parse(raw);
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///
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static Future<WatchPage> get(YoutubeHttpClient httpClient, String videoId) {
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final url = 'https://youtube.com/watch?v=$videoId&bpctr=9999999999&hl=en';
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return retry(() async {
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var req = await httpClient.get(url, validate: true);
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var cookies = req.headers['set-cookie'];
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var visitorInfoLive = _visitorInfoLiveExp.firstMatch(cookies).group(1);
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var ysc = _yscExp.firstMatch(cookies).group(1);
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var result = WatchPage.parse(req.body, visitorInfoLive, ysc);
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if (!result.isOk) {
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throw TransientFailureException('Video watch page is broken.');
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}
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if (!result.isVideoAvailable) {
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throw VideoUnavailableException.unavailable(VideoId(videoId));
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}
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return result;
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});
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}
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}
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class _PlayerConfig {
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// Json parsed map
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final PlayerConfigJson root;
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_PlayerConfig(this.root);
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String get sourceUrl => 'https://youtube.com${root.assets.js}';
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PlayerResponse get playerResponse =>
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PlayerResponse.parse(root.args.playerResponse);
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}
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class _InitialData {
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// Json parsed map
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final WatchPageId root;
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_InitialData(this.root);
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/* Cache results */
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String _continuation;
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String _clickTrackingParams;
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NextContinuationData getContinuationContext() {
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if (root.contents != null) {
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return root.contents.twoColumnWatchNextResults.results.results.contents
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.firstWhere((e) => e.itemSectionRenderer != null)
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.itemSectionRenderer
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.continuations
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.first
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.nextContinuationData;
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}
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return null;
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}
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String get continuation =>
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_continuation ??= getContinuationContext()?.continuation ?? '';
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String get clickTrackingParams => _clickTrackingParams ??=
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getContinuationContext()?.clickTrackingParams ?? '';
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}
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