141 lines
4.2 KiB
Dart
141 lines
4.2 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 '../../channels/channel_video.dart';
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import '../../extensions/helpers_extension.dart';
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import '../../retry.dart';
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import '../../videos/videos.dart';
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import '../youtube_http_client.dart';
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class ChannelWatchPage {
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final String channelId;
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final Document _root;
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_InitialData _initialData;
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_InitialData get initialData =>
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_initialData ??= _InitialData(json.decode(_matchJson(_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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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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ChannelWatchPage(this._root, this.channelId);
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Future<ChannelWatchPage> nextPage() {}
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static Future<ChannelWatchPage> get(
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YoutubeHttpClient httpClient, String channelId) {
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var url =
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'https://www.youtube.com/channel/$channelId/videos?view=0&sort=dd&flow=grid';
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return retry(() async {
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var raw = await httpClient.getString(url);
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return ChannelWatchPage.parse(raw, channelId);
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});
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}
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ChannelWatchPage.parse(String raw, this.channelId)
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: _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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/* Cache results */
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List<ChannelVideo> _uploads;
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String _continuation;
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String _clickTrackingParams;
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List<Map<String, dynamic>> getContentContext(Map<String, dynamic> root) {
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if (root['contents'] != null) {
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return (_root['contents']['twoColumnBrowseResultsRenderer']['tabs']
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as List<dynamic>)
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.map((e) => e['tabRenderer'])
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.firstWhere((e) => e['selected'] == true)['content']
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['sectionListRenderer']['contents']
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.first['itemSectionRenderer']['contents']
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.first['gridRenderer']['items']
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.cast<Map<String, dynamic>>();
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;
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}
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if (root['response'] != null) {
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return _root['response']['continuationContents']['gridContinuation']
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['items']
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.cast<Map<String, dynamic>>();
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}
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throw Exception('Couldn\'t find the content data');
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}
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Map<String, dynamic> getContinuationContext(Map<String, dynamic> root) {
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if (_root['contents'] != null) {
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return (_root['contents']['twoColumnBrowseResultsRenderer']['tabs']
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as List<dynamic>)
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?.map((e) => e['tabRenderer'])
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?.firstWhere((e) => e['selected'] == true)['content']
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['sectionListRenderer']['contents']
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?.first['itemSectionRenderer']['contents']
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?.first['gridRenderer']['continuations']
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?.first['nextContinuationData']
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?.cast<String, dynamic>();
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}
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if (_root['response'] != null) {
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return _root['response']['continuationContents']['gridContinuation']
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['continuations']
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?.first
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?.cast<String, dynamic>();
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}
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return null;
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}
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List<dynamic> get uploads => _uploads ??= getContentContext(_root)
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?.map(_parseContent)
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?.where((e) => e != null)
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?.toList();
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String get continuation => _continuation ??=
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getContinuationContext(_root)?.getValue('continuation') ?? '';
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String get clickTrackingParams => _clickTrackingParams ??=
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getContinuationContext(_root)?.getValue('clickTrackingParams') ?? '';
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dynamic _parseContent(content) {
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if (content == null || content['gridVideoRenderer'] == null) {
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return null;
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}
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var video = content['gridVideoRenderer'] as Map<String, dynamic>;
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return ChannelVideo(
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VideoId(video['videoId']), video['title']['simpleText']);
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}
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}
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