Add app only downloads APK if needed

lib/app_sources/fdroid.dart

@@ -30,6 +30,11 @@ class FDroid extends AppSource {
   @override
   Future<String> apkUrlPrefetchModifier(String apkUrl) async => apkUrl;
 
+  @override
+  String? tryGettingAppIdFromURL(String standardUrl) {
+    return Uri.parse(standardUrl).pathSegments.last;
+  }
+
   @override
   Future<APKDetails> getLatestAPKDetails(
       String standardUrl, List<String> additionalData) async {

lib/pages/add_app.dart

@@ -115,11 +115,15 @@ class _AddAppPageState extends State<AddAppPage> {
                                                     additionalData);
                                             await settingsProvider
                                                 .getInstallPermission();
+                                            // Only download the APK here if you need to for the package ID
+                                            if (sourceProvider
+                                                .isTempId(app.id)) {
                                               // ignore: use_build_context_synchronously
                                               var apkUrl = await appsProvider
                                                   .confirmApkUrl(app, context);
                                               if (apkUrl == null) {
-                                              throw ObtainiumError('Cancelled');
+                                                throw ObtainiumError(
+                                                    'Cancelled');
                                               }
                                               app.preferredApkIndex =
                                                   app.apkUrls.indexOf(apkUrl);
@@ -127,6 +131,7 @@ class _AddAppPageState extends State<AddAppPage> {
                                                   await appsProvider
                                                       .downloadApp(app);
                                               app.id = downloadedApk.appId;
+                                            }
                                             if (appsProvider.apps
                                                 .containsKey(app.id)) {
                                               throw ObtainiumError(

lib/providers/source_provider.dart

@@ -163,6 +163,10 @@ class AppSource {
   Future<Map<String, String>> search(String query) {
     throw NotImplementedError();
   }
+
+  String? tryGettingAppIdFromURL(String standardUrl) {
+    return null;
+  }
 }
 
 ObtainiumError getObtainiumHttpError(Response res) {
@@ -240,7 +244,9 @@ class SourceProvider {
     APKDetails apk =
         await source.getLatestAPKDetails(standardUrl, additionalData);
     return App(
-        id ?? generateTempID(names, source),
+        id ??
+            source.tryGettingAppIdFromURL(standardUrl) ??
+            generateTempID(names, source),
         standardUrl,
         names.author[0].toUpperCase() + names.author.substring(1),
         name.trim().isNotEmpty