Obtainium/lib/app_sources/huaweiappgallery.dart

import 'package:easy_localization/easy_localization.dart';
import 'package:http/http.dart';
import 'package:obtainium/custom_errors.dart';
import 'package:obtainium/providers/source_provider.dart';

class HuaweiAppGallery extends AppSource {
  HuaweiAppGallery() {
    name = 'Huawei AppGallery';
    host = 'appgallery.huawei.com';
    overrideVersionDetectionFormDefault('releaseDateAsVersion',
        disableStandard: true);
  }

  @override
  String sourceSpecificStandardizeURL(String url) {
    RegExp standardUrlRegEx = RegExp('^https?://(www\\.)?$host/app/[^/]+');
    RegExpMatch? match = standardUrlRegEx.firstMatch(url.toLowerCase());
    if (match == null) {
      throw InvalidURLError(name);
    }
    return url.substring(0, match.end);
  }

  getDlUrl(String standardUrl) =>
      'https://${host!.replaceAll('appgallery.', 'appgallery.cloud.')}/appdl/${standardUrl.split('/').last}';

  requestAppdlRedirect(String dlUrl) async {
    Response res = await sourceRequest(dlUrl, followRedirects: false);
    if (res.statusCode == 200 ||
        res.statusCode == 302 ||
        res.statusCode == 304) {
      return res;
    } else {
      throw getObtainiumHttpError(res);
    }
  }

  appIdFromRedirectDlUrl(String redirectDlUrl) {
    var parts = redirectDlUrl
        .split('?')[0]
        .split('/')
        .last
        .split('.')
        .reversed
        .toList();
    parts.removeAt(0);
    parts.removeAt(0);
    return parts.reversed.join('.');
  }

  @override
  Future<String?> tryInferringAppId(String standardUrl,
      {Map<String, dynamic> additionalSettings = const {}}) async {
    String dlUrl = getDlUrl(standardUrl);
    Response res = await requestAppdlRedirect(dlUrl);
    return res.headers['location'] != null
        ? appIdFromRedirectDlUrl(res.headers['location']!)
        : null;
  }

  @override
  Future<APKDetails> getLatestAPKDetails(
    String standardUrl,
    Map<String, dynamic> additionalSettings,
  ) async {
    String dlUrl = getDlUrl(standardUrl);
    Response res = await requestAppdlRedirect(dlUrl);
    if (res.headers['location'] == null) {
      throw NoReleasesError();
    }
    String appId = appIdFromRedirectDlUrl(res.headers['location']!);
    var relDateStr =
        res.headers['location']?.split('?')[0].split('.').reversed.toList()[1];
    var relDateStrAdj = relDateStr?.split('');
    var tempLen = relDateStrAdj?.length ?? 0;
    var i = 2;
    while (i < tempLen) {
      relDateStrAdj?.insert((i + i ~/ 2 - 1), '-');
      i += 2;
    }
    var relDate = relDateStrAdj == null
        ? null
        : DateFormat('yy-MM-dd-HH-mm').parse(relDateStrAdj.join(''));
    if (relDateStr == null) {
      throw NoVersionError();
    }
    return APKDetails(
        relDateStr, [MapEntry('$appId.apk', dlUrl)], AppNames(name, appId),
        releaseDate: relDate);
  }
}