Merge branch 'replicant-fsdg-compliance' into 'master'

Skip non-FSDG-compliant apps on Replicant during repo data parsing

See merge request !452

app/src/main/java/org/fdroid/fdroid/RepoXMLHandler.java

@@ -303,7 +303,9 @@ public class RepoXMLHandler extends DefaultHandler {
     }
 
     private void onApplicationParsed() {
-        receiver.receiveApp(curapp, apksList);
+        if (!replicantFSDGviolation()) {
+            receiver.receiveApp(curapp, apksList);
+        }
         curapp = null;
         apksList = new ArrayList<>();
         // If the app packageName is already present in this apps list, then it
@@ -402,4 +404,27 @@ public class RepoXMLHandler extends DefaultHandler {
         }
         return result;
     }
+
+    private final String osVersion = System.getProperty("os.version");
+
+    /**
+     * Checks if an app fails to comply with the GNU Free System Distribution
+     * Guidelines in the case that F-Droid is installed on Replicant.
+     * Currently, all apps that have at least one of the following anti-features
+     * violate the guidelines: Tracking, NonFreeAdd, NonFreeDep and NonFreeAssets.
+     */
+    private boolean replicantFSDGviolation() {
+        if (osVersion == null || !osVersion.contains("replicant")) {
+            return false;
+        }
+        if (curapp.antiFeatures != null && curapp.antiFeatures.length > 0) {
+            for (String af : curapp.antiFeatures) {
+                if ("Tracking".equals(af) || "NonFreeAdd".equals(af)
+                        || "NonFreeDep".equals(af) || "NonFreeAssets".equals(af)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
 }