import 'dart:convert';
import 'package:html/dom.dart';
import 'package:html/parser.dart' as parser;
import 'package:http_parser/http_parser.dart';
import '../../../youtube_explode_dart.dart';
import '../../extensions/helpers_extension.dart';
import '../../retry.dart';
import '../../videos/video_id.dart';
import '../youtube_http_client.dart';
import 'player_response.dart';
import 'stream_info_provider.dart';
class WatchPage {
final RegExp _videoLikeExp = RegExp(r'"label"\s*:\s*"([\d,\.]+) likes"');
final RegExp _videoDislikeExp =
RegExp(r'"label"\s*:\s*"([\d,\.]+) dislikes"');
final Document _root;
WatchPage(this._root);
bool get isOk => _root.body.querySelector('#player') != null;
bool get isVideoAvailable =>
_root.querySelector('meta[property="og:url"]') != null;
int get videoLikeCount => int.parse(_videoLikeExp
.firstMatch(_root.outerHtml)
?.group(1)
?.stripNonDigits()
?.nullIfWhitespace ??
_root
.querySelector('.like-button-renderer-like-button')
?.text
?.stripNonDigits()
?.nullIfWhitespace ??
'0');
int get videoDislikeCount => int.parse(_videoDislikeExp
.firstMatch(_root.outerHtml)
?.group(1)
?.stripNonDigits()
?.nullIfWhitespace ??
_root
.querySelector('.like-button-renderer-dislike-button')
?.text
?.stripNonDigits()
?.nullIfWhitespace ??
'0');
_PlayerConfig get playerConfig =>
_PlayerConfig(json.decode(_matchJson(_extractJson(
_root.getElementsByTagName('html').first.text,
'ytplayer.config = '))));
String _extractJson(String html, String separator) {
return _matchJson(
html.substring(html.indexOf(separator) + separator.length));
}
String _matchJson(String str) {
var bracketCount = 0;
int lastI;
for (var i = 0; i < str.length; i++) {
lastI = i;
if (str[i] == '{') {
bracketCount++;
} else if (str[i] == '}') {
bracketCount--;
} else if (str[i] == ';') {
if (bracketCount == 0) {
return str.substring(0, i);
}
}
}
return str.substring(0, lastI + 1);
}
WatchPage.parse(String raw) : _root = parser.parse(raw);
static Future get(YoutubeHttpClient httpClient, String videoId) {
final url = 'https://youtube.com/watch?v=$videoId&bpctr=9999999999&hl=en';
return retry(() async {
var raw = await httpClient.getString(url);
var result = WatchPage.parse(raw);
if (!result.isOk) {
throw TransientFailureException("Video watch page is broken.");
}
if (!result.isVideoAvailable) {
throw VideoUnavailableException.unavailable(VideoId(videoId));
}
return result;
});
}
}
class _StreamInfo extends StreamInfoProvider {
final Map _root;
_StreamInfo(this._root);
@override
int get bitrate => int.parse(_root['bitrate']);
@override
int get tag => int.parse(_root['itag']);
@override
String get url => _root['url'];
@override
String get signature => _root['s'];
@override
String get signatureParameter => _root['sp'];
@override
int get contentLength => int.tryParse(_root['clen'] ??
StreamInfoProvider.contentLenExp
.firstMatch(url)
.group(1)
.nullIfWhitespace ??
'');
MediaType get mimeType => MediaType.parse(_root['mimeType']);
@override
String get container => mimeType.subtype;
bool get isAudioOnly => mimeType.type == 'audio';
@override
String get audioCodec => codecs.last;
@override
String get videoCodec => isAudioOnly ? null : codecs.first;
List get codecs =>
mimeType.parameters['codecs'].split(',').map((e) => e.trim());
@override
String get videoQualityLabel => _root['quality_label'];
List get _size =>
_root['size'].split(',').map((e) => int.tryParse(e ?? ''));
@override
int get videoWidth => _size.first;
@override
int get videoHeight => _size.last;
@override
int get framerate => int.tryParse(_root['fps'] ?? '');
}
class _PlayerConfig {
// Json parsed map
final Map _root;
_PlayerConfig(this._root);
String get sourceUrl => 'https://youtube.com${_root['assets']['js']}';
PlayerResponse get playerResponse =>
PlayerResponse.parse(_root['args']['player_response']);
List<_StreamInfo> get muxedStreams =>
_root
.get('args')
?.getValue('url_encoded_fmt_stream_map')
?.split(',')
?.map((e) => _StreamInfo(Uri.splitQueryString(e))) ??
const [];
List<_StreamInfo> get adaptiveStreams =>
_root
.get('args')
?.getValue('adaptive_fmts')
?.split(',')
?.map((e) => _StreamInfo(Uri.splitQueryString(e))) ??
const [];
List<_StreamInfo> get streams => [...muxedStreams, ...adaptiveStreams];
}
class _InitialData {
// Json parsed map
final Map _root;
_InitialData(this._root);
/* Cache results */
List _searchContent;
List _relatedVideos;
List _relatedQueries;
String _continuation;
String _clickTrackingParams;
List