134 lines
3.3 KiB
Dart
134 lines
3.3 KiB
Dart
import 'package:html/dom.dart';
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import 'package:html/parser.dart' as parser;
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import '../../exceptions/exceptions.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 ChannelPage {
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final Document _root;
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///
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bool get isOk => _root.querySelector('meta[property="og:url"]') != null;
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///
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String get channelUrl =>
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_root.querySelector('meta[property="og:url"]')?.attributes['content'] ??
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'';
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///
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String get channelId => channelUrl.substringAfter('channel/');
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///
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String get channelTitle =>
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_root.querySelector('meta[property="og:title"]')?.attributes['content'] ??
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'';
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///
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String get channelLogoUrl =>
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_root.querySelector('meta[property="og:image"]')?.attributes['content'] ??
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'';
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int? get subscribersCount => initialData.subscribersCount;
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///
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late final _InitialData initialData = _getInitialData();
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_InitialData _getInitialData() {
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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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return scriptText.extractGenericData(
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(obj) => _InitialData(obj),
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() => TransientFailureException(
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'Failed to retrieve initial data from the channel about page, please report this to the project GitHub page.'));
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}
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///
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ChannelPage(this._root);
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///
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ChannelPage.parse(String raw) : _root = parser.parse(raw);
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///
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static Future<ChannelPage> get(YoutubeHttpClient httpClient, String id) {
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var url = 'https://www.youtube.com/channel/$id?hl=en';
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return retry(() async {
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var raw = await httpClient.getString(url);
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var result = ChannelPage.parse(raw);
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if (!result.isOk) {
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throw TransientFailureException('Channel page is broken');
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}
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return result;
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});
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}
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///
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static Future<ChannelPage> getByUsername(
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YoutubeHttpClient httpClient, String username) {
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var url = 'https://www.youtube.com/user/$username?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 = ChannelPage.parse(raw);
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if (!result.isOk) {
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throw TransientFailureException('Channel 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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class _InitialData {
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static final RegExp _subCountExp = RegExp(r'(\d+(?:\.\d+)?)(K|M|\s)');
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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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int? get subscribersCount {
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final renderer = root.get('header')?.get('c4TabbedHeaderRenderer');
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if (renderer?['subscriberCountText'] == null) {
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return null;
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}
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final subText =
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renderer?.get('subscriberCountText')?.getT<String>('simpleText');
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if (subText == null) {
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return null;
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}
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final match = _subCountExp.firstMatch(subText);
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if (match == null) {
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return null;
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}
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if (match.groupCount != 2) {
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return null;
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}
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final count = double.tryParse(match.group(1) ?? '');
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if (count == null) {
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return null;
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}
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final multiplierText = match.group(2);
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if (multiplierText == null) {
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return null;
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}
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var multiplier = 1;
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if (multiplierText == 'K') {
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multiplier = 1000;
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} else if (multiplierText == 'M') {
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multiplier = 1000000;
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}
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return (count * multiplier).toInt();
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}
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}
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