149 lines
3.8 KiB
Dart
149 lines
3.8 KiB
Dart
import 'package:html/dom.dart';
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import 'package:html/parser.dart' as parser;
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import 'package:youtube_explode_dart/youtube_explode_dart.dart';
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import '../../exceptions/exceptions.dart';
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import '../../retry.dart';
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import '../youtube_http_client.dart';
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import 'generated/channel_about_page_id.g.dart';
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import '../../extensions/helpers_extension.dart';
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///
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class ChannelAboutPage {
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final Document _root;
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_InitialData _initialData;
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///
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_InitialData get initialData =>
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_initialData ??= _InitialData(ChannelAboutPageId.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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bool get isOk => initialData != null;
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///
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String get description => initialData.description;
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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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ChannelAboutPage(this._root);
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///
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ChannelAboutPage.parse(String raw) : _root = parser.parse(raw);
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///
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static Future<ChannelAboutPage> get(YoutubeHttpClient httpClient, String id) {
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var url = 'https://www.youtube.com/channel/$id/about?hl=en';
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return retry(() async {
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var raw = await httpClient.getString(url);
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var result = ChannelAboutPage.parse(raw);
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if (!result.isOk) {
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throw TransientFailureException('Channel about page is broken');
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}
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return result;
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});
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}
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///
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static Future<ChannelAboutPage> getByUsername(
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YoutubeHttpClient httpClient, String username) {
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var url = 'https://www.youtube.com/user/$username/about?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 = ChannelAboutPage.parse(raw);
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if (!result.isOk) {
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throw TransientFailureException('Channel about page is broken');
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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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final _urlExp = RegExp(r'q=([^=]*)$');
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class _InitialData {
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// Json parsed class
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final ChannelAboutPageId root;
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_InitialData(this.root);
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/* Cache results */
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ChannelAboutFullMetadataRenderer _content;
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ChannelAboutFullMetadataRenderer get content =>
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_content ??= getContentContext();
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ChannelAboutFullMetadataRenderer getContentContext() {
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return root
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.contents
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.twoColumnBrowseResultsRenderer
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.tabs[5]
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.tabRenderer
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.content
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.sectionListRenderer
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.contents
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.first
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.itemSectionRenderer
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.contents
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.first
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.channelAboutFullMetadataRenderer;
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}
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String get description => content.description.simpleText;
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List<ChannelLink> get channelLinks {
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return content.primaryLinks.map((e) => ChannelLink(
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e.title.simpleText,
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extractUrl(e.navigationEndpoint.urlEndpoint.url),
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Uri.parse(e.icon.thumbnails.first.url)));
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}
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int get viewCount =>
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int.parse(content.viewCountText.simpleText.stripNonDigits());
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String get joinDate => content.joinedDateText.runs[1].text;
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String get title => content.title.simpleText;
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dynamic get avatar => content.avatar.thumbnails;
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/// todo: continue from here with more data!
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String parseRuns(List<dynamic> runs) =>
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runs?.map((e) => e.text)?.join() ?? '';
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Uri extractUrl(String text) =>
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Uri.parse(Uri.decodeFull(_urlExp.firstMatch(text).group(1)));
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}
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