Support Direct APK Links (#1292)

lib/app_sources/directAPKLink.dart

@@ -0,0 +1,44 @@
+import 'package:easy_localization/easy_localization.dart';
+import 'package:obtainium/app_sources/html.dart';
+import 'package:obtainium/providers/source_provider.dart';
+
+class DirectAPKLink extends AppSource {
+  HTML html = HTML();
+
+  DirectAPKLink() {
+    neverAutoSelect = true;
+    name = tr('directAPKLink');
+    additionalSourceAppSpecificSettingFormItems = html
+        .additionalSourceAppSpecificSettingFormItems
+        .where((element) => element
+            .where((element) => element.key == 'requestHeader')
+            .isNotEmpty)
+        .toList();
+    excludeCommonSettingKeys = [
+      'versionExtractionRegEx',
+      'matchGroupToUse',
+      'versionDetection',
+      'useVersionCodeAsOSVersion',
+      'apkFilterRegEx',
+      'autoApkFilterByArch'
+    ];
+  }
+
+  @override
+  Future<APKDetails> getLatestAPKDetails(
+    String standardUrl,
+    Map<String, dynamic> additionalSettings,
+  ) async {
+    var additionalSettingsNew =
+        getDefaultValuesFromFormItems(html.combinedAppSpecificSettingFormItems);
+    for (var s in additionalSettings.keys) {
+      if (additionalSettingsNew.containsKey(s)) {
+        additionalSettingsNew[s] = additionalSettings[s];
+      }
+    }
+    additionalSettingsNew['defaultPseudoVersioningMethod'] = 'partialAPKHash';
+    additionalSettingsNew['directAPKLink'] = true;
+    additionalSettings['versionDetection'] = false;
+    return html.getLatestAPKDetails(standardUrl, additionalSettingsNew);
+  }
+}