Various fixes and improvements (#454, #1026, #1050, #1051, #1052, #1060)

lib/app_sources/fdroid.dart

@@ -181,7 +181,7 @@ APKDetails getAPKUrlsFromFDroidPackagesAPIResponse(
     List<String> apkUrls = releaseChoices
         .map((e) => '${apkUrlPrefix}_${e['versionCode']}.apk')
         .toList();
-    return APKDetails(version, getApkUrlsFromUrls(apkUrls),
+    return APKDetails(version, getApkUrlsFromUrls(apkUrls.toSet().toList()),
         AppNames(sourceName, Uri.parse(standardUrl).pathSegments.last));
   } else {
     throw getObtainiumHttpError(res);

lib/app_sources/fdroidrepo.dart

@@ -108,7 +108,8 @@ class FDroidRepo extends AppSource {
     if (appIdOrName == null) {
       throw NoReleasesError();
     }
-    var res = await sourceRequest('$standardUrl/index.xml');
+    var res = await sourceRequest(
+        '$standardUrl${standardUrl.endsWith('/index.xml') ? '' : '/index.xml'}');
     if (res.statusCode == 200) {
       var body = parse(res.body);
       var foundApps = body.querySelectorAll('application').where((element) {

lib/app_sources/html.dart

@@ -170,7 +170,15 @@ class HTML extends AppSource {
       List<String> allLinks = html
           .querySelectorAll('a')
           .map((element) => element.attributes['href'] ?? '')
+          .where((element) => element.isNotEmpty)
           .toList();
+      if (allLinks.isEmpty) {
+        allLinks = RegExp(
+                r'(http|ftp|https)://([\w_-]+(?:(?:\.[\w_-]+)+))([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-])?')
+            .allMatches(res.body)
+            .map((match) => match.group(0)!)
+            .toList();
+      }
       List<String> links = [];
       if ((additionalSettings['intermediateLinkRegex'] as String?)
               ?.isNotEmpty ==

lib/app_sources/uptodown.dart

@@ -89,11 +89,11 @@ class Uptodown extends AppSource {
       throw getObtainiumHttpError(res);
     }
     var html = parse(res.body);
-    var finalUrl =
-        (html.querySelector('.post-download')?.attributes['data-url']);
-    if (finalUrl == null) {
+    var finalUrlKey =
+        html.querySelector('.post-download')?.attributes['data-url'];
+    if (finalUrlKey == null) {
       throw NoAPKError();
     }
-    return finalUrl;
+    return 'https://dw.$host/dwn/$finalUrlKey';
   }
 }