173 lines
4.3 KiB
Dart
173 lines
4.3 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 'package:http_parser/http_parser.dart';
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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 '../reverse_engineering.dart';
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import 'player_response.dart';
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class WatchPage {
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final RegExp _videoLikeExp = RegExp(r'label""\s*:\s*""([\d,\.]+) likes');
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final RegExp _videoDislikeExp =
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RegExp(r'label""\s*:\s*""([\d,\.]+) dislikes');
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final Document _root;
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WatchPage(this._root);
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bool get isOk => _root.body.querySelector('#player') != null;
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bool get isVideoAvailable =>
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_root.querySelector('meta[property="og:url"]') != null;
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int get videoLikeCount => int.tryParse(_videoLikeExp
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.firstMatch(_root.text)
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.group(1)
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.nullIfWhitespace
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?.stripNonDigits() ??
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'');
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int get videoDislikeCount => int.tryParse(_videoDislikeExp
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.firstMatch(_root.text)
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.group(1)
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.nullIfWhitespace
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?.stripNonDigits() ??
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'');
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_PlayerConfig get playerConfig => _PlayerConfig(json.decode(_root
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.getElementsByTagName('script')
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.map((e) => e.text)
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.map(_extractJson)
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.firstWhere((e) => e != null)));
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WatchPage.parse(String raw) : _root = parser.parse(raw);
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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 raw = await httpClient.getString(url);
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var result = WatchPage.parse(raw);
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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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String _extractJson(String str) {
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var startIndex = str.indexOf('ytplayer.config =');
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var endIndex = str.indexOf(';ytplayer.load =');
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if (startIndex == -1 || endIndex == -1) return null;
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return str.substring(startIndex + 17, endIndex);
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}
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}
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class _StreamInfo extends StreamInfoProvider {
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final Map<String, String> _root;
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_StreamInfo(this._root);
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@override
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int get bitrate => int.parse(_root['bitrate']);
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@override
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int get tag => int.parse(_root['itag']);
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@override
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String get url => _root['url'];
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@override
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String get signature => _root['s'];
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@override
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String get signatureParameter => _root['sp'];
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@override
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int get contentLength => int.tryParse(_root['clen'] ??
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StreamInfoProvider.contentLenExp
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.firstMatch(url)
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.group(1)
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.nullIfWhitespace ??
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'');
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MediaType get mimeType => MediaType.parse(_root['mimeType']);
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@override
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String get container => mimeType.subtype;
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bool get isAudioOnly => mimeType.type == 'audio';
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@override
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String get audioCodec => codecs.last;
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@override
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String get videoCodec => isAudioOnly ? null : codecs.first;
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List<String> get codecs =>
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mimeType.parameters['codecs'].split(',').map((e) => e.trim());
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@override
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String get videoQualityLabel => _root['quality_label'];
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List<int> get _size =>
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_root['size'].split(',').map((e) => int.tryParse(e ?? ''));
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@override
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int get videoWidth => _size.first;
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@override
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int get videoHeight => _size.last;
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@override
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int get framerate => int.tryParse(_root['fps'] ?? '');
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}
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class _PlayerConfig {
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// Json parsed map
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final Map<String, dynamic> _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']['player_response']);
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List<_StreamInfo> get muxedStreams =>
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_root['args']
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.get('url_encoded_fmt_stream_map')
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?.split(',')
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?.map((e) => _StreamInfo(Uri.splitQueryString(e))) ??
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const [];
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List<_StreamInfo> get adaptiveStreams =>
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_root['args']
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.get('adaptive_fmts')
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?.split(',')
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?.map((e) => _StreamInfo(Uri.splitQueryString(e))) ??
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const [];
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List<_StreamInfo> get streams => [...muxedStreams, ...adaptiveStreams];
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}
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extension _GetOrNull<K, V> on Map<K, V> {
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V get(K key) {
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var v = this[key];
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if (v == null) {
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return null;
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}
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return v;
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}
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}
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