import 'dart:convert';
import 'package:html/dom.dart';
import 'package:html/parser.dart' as parser;
import '../../channels/channel_video.dart';
import '../../exceptions/exceptions.dart';
import '../../extensions/helpers_extension.dart';
import '../../retry.dart';
import '../../videos/videos.dart';
import '../youtube_http_client.dart';
///
class ChannelUploadPage {
///
final String channelId;
final Document _root;
_InitialData _initialData;
///
_InitialData get initialData =>
_initialData ??= _InitialData(json.decode(_matchJson(_extractJson(
_root
.querySelectorAll('script')
.map((e) => e.text)
.toList()
.firstWhere((e) => e.contains('window["ytInitialData"] =')),
'window["ytInitialData"] ='))));
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);
}
///
ChannelUploadPage(this._root, this.channelId, [_InitialData initialData])
: _initialData = initialData;
///
Future nextPage(YoutubeHttpClient httpClient) {
if (initialData.continuation.isEmpty) {
return Future.value(null);
}
var url =
'https://www.youtube.com/browse_ajax?ctoken=${initialData.continuation}&continuation=${initialData.continuation}&itct=${initialData.clickTrackingParams}';
return retry(() async {
var raw = await httpClient.getString(url);
return ChannelUploadPage(
null, channelId, _InitialData(json.decode(raw)[1]));
});
}
///
static Future get(
YoutubeHttpClient httpClient, String channelId, String sorting) {
assert(sorting != null);
var url =
'https://www.youtube.com/channel/$channelId/videos?view=0&sort=$sorting&flow=grid';
return retry(() async {
var raw = await httpClient.getString(url);
return ChannelUploadPage.parse(raw, channelId);
});
}
///
ChannelUploadPage.parse(String raw, this.channelId)
: _root = parser.parse(raw);
}
class _InitialData {
// Json parsed map
final Map _root;
_InitialData(this._root);
/* Cache results */
List _uploads;
String _continuation;
String _clickTrackingParams;
List