Added farsroid.com as a source (#2435)

lib/app_sources/farsroid.dart

@@ -0,0 +1,76 @@
+import 'dart:convert';
+
+import 'package:html/parser.dart';
+import 'package:obtainium/app_sources/html.dart';
+import 'package:obtainium/custom_errors.dart';
+import 'package:obtainium/providers/source_provider.dart';
+
+class Farsroid extends AppSource {
+  Farsroid() {
+    hosts = ['farsroid.com'];
+    name = 'Farsroid';
+  }
+
+  @override
+  String sourceSpecificStandardizeURL(String url, {bool forSelection = false}) {
+    RegExp standardUrlRegEx = RegExp(
+      '^https?://([^\\.]+\\.)${getSourceRegex(hosts)}/[^/]+',
+      caseSensitive: false,
+    );
+    RegExpMatch? match = standardUrlRegEx.firstMatch(url);
+    if (match == null) {
+      throw InvalidURLError(name);
+    }
+    return match.group(0)!;
+  }
+
+  @override
+  Future<APKDetails> getLatestAPKDetails(
+    String standardUrl,
+    Map<String, dynamic> additionalSettings,
+  ) async {
+    String appName = Uri.parse(standardUrl).pathSegments.last;
+
+    var res = await sourceRequest(standardUrl, additionalSettings);
+    if (res.statusCode != 200) {
+      throw getObtainiumHttpError(res);
+    }
+    var html = parse(res.body);
+    var dlinks = html.querySelectorAll('.download-links');
+    if (dlinks.isEmpty) {
+      throw NoReleasesError();
+    }
+    var postId = dlinks.first.attributes['data-post-id'] ?? '';
+    var version = dlinks.first.attributes['data-post-version'] ?? '';
+
+    if (postId.isEmpty || version.isEmpty) {
+      throw NoVersionError();
+    }
+
+    var res2 = await sourceRequest(
+      Uri.encodeFull(
+        'https://${hosts[0]}/api/download-box/?post_id=$postId&post_version=$version',
+      ),
+      additionalSettings,
+    );
+    var html2 = jsonDecode(res2.body)?['data']?['content'] as String? ?? '';
+    if (html2.isEmpty) {
+      throw NoAPKError();
+    }
+    var apkLinks =
+        (await grabLinksCommon(html2, res2.request!.url, additionalSettings))
+            .map((l) => MapEntry(Uri.parse(l.key).pathSegments.last, l.key))
+            .where(
+              (l) => l.key.toLowerCase().startsWith(
+                '$appName-$version'.toLowerCase(),
+              ),
+            )
+            .toList();
+
+    if (apkLinks.isEmpty) {
+      throw NoAPKError();
+    }
+
+    return APKDetails(version, apkLinks, AppNames(name, appName));
+  }
+}