306 lines
8.3 KiB
Dart
306 lines
8.3 KiB
Dart
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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 '../youtube_http_client.dart';
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///
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class PlaylistPage {
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final _apiKeyExp = RegExp(r'"INNERTUBE_API_KEY":"(\w+?)"');
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///
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final String playlistId;
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final Document _root;
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String _apiKey;
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///
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String get apiKey => _apiKey ??= _apiKeyExp
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.firstMatch(_root
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.querySelectorAll('script')
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.firstWhere((e) => e.text.contains('INNERTUBE_API_KEY'))
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.text)
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.group(1);
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_InitialData _initialData;
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///
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_InitialData get initialData {
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if (_initialData != null) {
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return _initialData;
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}
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final scriptText = _root
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.querySelectorAll('script')
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.map((e) => e.text)
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.toList(growable: false);
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var initialDataText = scriptText.firstWhere(
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(e) => e.contains('window["ytInitialData"] ='),
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orElse: () => null);
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if (initialDataText != null) {
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return _initialData = _InitialData(json
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.decode(_extractJson(initialDataText, 'window["ytInitialData"] =')));
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}
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initialDataText = scriptText.firstWhere(
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(e) => e.contains('var ytInitialData = '),
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orElse: () => null);
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if (initialDataText != null) {
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return _initialData = _InitialData(
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json.decode(_extractJson(initialDataText, 'var ytInitialData = ')));
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}
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throw TransientFailureException(
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'Failed to retrieve initial data from the search page, please report this to the project GitHub page.'); // ignore: lines_longer_than_80_chars
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}
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String _extractJson(String html, String separator) {
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if (html == null || separator == null) {
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return null;
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}
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var index = html.indexOf(separator) + separator.length;
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if (index > html.length) {
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return null;
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}
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return _matchJson(html.substring(index));
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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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PlaylistPage(this._root, this.playlistId,
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[_InitialData initialData, this._apiKey])
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: _initialData = initialData;
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///
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Future<PlaylistPage> nextPage(YoutubeHttpClient httpClient) async {
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if (initialData.continuationToken == null) {
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return null;
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}
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return get(httpClient, playlistId, token: initialData.continuationToken);
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}
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///
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static Future<PlaylistPage> get(YoutubeHttpClient httpClient, String id,
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{String token}) {
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if (token != null && token.isNotEmpty) {
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var url =
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'https://www.youtube.com/youtubei/v1/search?key=AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8';
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return retry(() async {
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var body = {
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'context': const {
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'client': {
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'hl': 'en',
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'clientName': 'WEB',
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'clientVersion': '2.20200911.04.00'
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}
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},
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'continuation': token
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};
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var raw = await httpClient.post(url, body: json.encode(body));
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return PlaylistPage(null, id, _InitialData(json.decode(raw.body)));
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});
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// Ask for next page,
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}
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var url = 'https://www.youtube.com/playlist?list=$id&hl=en&persist_hl=1';
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return retry(() async {
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var raw = await httpClient.getString(url);
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return PlaylistPage.parse(raw, id);
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});
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// ask for next page
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}
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///
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PlaylistPage.parse(String raw, this.playlistId) : _root = parser.parse(raw);
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}
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class _InitialData {
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// Json parsed map
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final Map<String, dynamic> root;
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_InitialData(this.root);
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String get title => root
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?.get('metadata')
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?.get('playlistMetadataRenderer')
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?.getT<String>('title');
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String get author => root
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.get('sidebar')
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?.get('playlistSidebarRenderer')
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?.getList('items')
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?.elementAtSafe(1)
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?.get('playlistSidebarSecondaryInfoRenderer')
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?.get('videoOwner')
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?.get('videoOwnerRenderer')
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?.get('title')
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?.getT<List<dynamic>>('runs')
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?.parseRuns();
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String get description => root
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?.get('metadata')
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?.get('playlistMetadataRenderer')
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?.getT<String>('description');
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int get viewCount => root
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?.get('sidebar')
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?.get('playlistSidebarRenderer')
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?.getList('items')
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?.firstOrNull
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?.get('playlistSidebarPrimaryInfoRenderer')
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?.getList('stats')
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?.elementAtSafe(1)
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?.getT<String>('simpleText')
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?.parseInt();
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String get continuationToken => (videosContent ?? playlistVideosContent)
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?.firstWhere((e) => e['continuationItemRenderer'] != null,
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orElse: () => null)
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?.get('continuationItemRenderer')
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?.get('continuationEndpoint')
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?.get('continuationCommand')
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?.getT<String>('token');
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List<Map<String, dynamic>> get playlistVideosContent =>
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root
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.get('contents')
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?.get('twoColumnBrowseResultsRenderer')
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?.getList('tabs')
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?.firstOrNull
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?.get('tabRenderer')
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?.get('content')
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?.get('sectionListRenderer')
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?.getList('contents')
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?.firstOrNull
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?.get('itemSectionRenderer')
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?.getList('contents')
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?.firstOrNull
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?.get('playlistVideoListRenderer')
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?.getList('contents') ??
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root
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.getList('onResponseReceivedActions')
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?.firstOrNull
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?.get('appendContinuationItemsAction')
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?.get('continuationItems');
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List<Map<String, dynamic>> get videosContent =>
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root
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.get('contents')
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?.get('twoColumnSearchResultsRenderer')
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?.get('primaryContents')
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?.get('sectionListRenderer')
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?.getList('contents') ??
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root
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?.getList('onResponseReceivedCommands')
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?.firstOrNull
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?.get('appendContinuationItemsAction')
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?.get('continuationItems');
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List<_Video> get playlistVideos =>
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playlistVideosContent
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?.where((e) => e['playlistVideoRenderer'] != null)
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?.map((e) => _Video(e['playlistVideoRenderer']))
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?.toList() ??
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const [];
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List<_Video> get videos =>
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videosContent?.firstOrNull
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?.get('itemSectionRenderer')
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?.getList('contents')
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?.where((e) => e['videoRenderer'] != null)
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?.map((e) => _Video(e))
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?.toList() ??
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const [];
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}
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class _Video {
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// Json parsed map
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final Map<String, dynamic> root;
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_Video(this.root);
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String get id => root?.getT<String>('videoId');
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String get author =>
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root?.get('ownerText')?.getT<List<dynamic>>('runs')?.parseRuns() ??
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root?.get('shortBylineText')?.getT<List<dynamic>>('runs')?.parseRuns() ??
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'';
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String get channelId =>
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root
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.get('ownerText')
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?.getList('runs')
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?.firstOrNull
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?.get('navigationEndpoint')
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?.get('browseEndpoint')
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?.getT<String>('browseId') ??
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root
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.get('shortBylineText')
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?.getList('runs')
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?.firstOrNull
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?.get('navigationEndpoint')
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?.get('browseEndpoint')
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?.getT<String>('browseId') ??
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'';
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String get title => root.get('title')?.getList('runs')?.parseRuns() ?? '';
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String get description =>
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root.getList('descriptionSnippet')?.parseRuns() ?? '';
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Duration get duration =>
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_stringToDuration(root.get('lengthText')?.getT<String>('simpleText'));
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int get viewCount =>
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root.get('viewCountText')?.getT<String>('simpleText')?.parseInt() ?? 0;
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/// Format: HH:MM:SS
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static Duration _stringToDuration(String string) {
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if (string == null || string.trim().isEmpty) {
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return null;
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}
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var parts = string.split(':');
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assert(parts.length <= 3);
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if (parts.length == 1) {
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return Duration(seconds: int.parse(parts.first));
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}
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if (parts.length == 2) {
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return Duration(
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minutes: int.parse(parts.first), seconds: int.parse(parts[1]));
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}
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if (parts.length == 3) {
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return Duration(
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hours: int.parse(parts[0]),
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minutes: int.parse(parts[1]),
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seconds: int.parse(parts[2]));
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}
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throw Error();
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}
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}
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