Do not export prefs missing from the schema

Author: emanuele-f

app/src/main/java/com/emanuelef/remote_capture/model/SettingsBackup.java

@@ -63,12 +63,14 @@ public static String serialize(SharedPreferences prefs) {
         JsonObject settings = new JsonObject();
 
         for (Map.Entry<String, ?> entry: prefs.getAll().entrySet()) {
-            if (PrefsSchema.isExcludedFromBackup(entry.getKey()))
+            String key = entry.getKey();
+
+            if (PrefsSchema.isExcludedFromBackup(key) || !PrefsSchema.isKnown(key))
                 continue;
 
             JsonObject encoded = encode(entry.getValue());
             if (encoded != null)
-                settings.add(entry.getKey(), encoded);
+                settings.add(key, encoded);
         }
 
         JsonObject root = new JsonObject();

app/src/test/java/com/emanuelef/remote_capture/SettingsBackupTest.java

@@ -130,6 +130,7 @@ public void testExcludedKeysNotExported() {
                 .putString("available_skus", "{}")
                 .putString("unlock_token", "token")
                 .putLong(Billing.SKU_PREF_PREFIX + Billing.PCAPNG_SKU, 1234)
+                .putString(Prefs.PREF_COLLECTOR_IP_KEY, "1.2.3.4")
                 .putBoolean(Prefs.PREF_ROOT_CAPTURE, true)
                 .commit();
 
@@ -143,6 +144,7 @@ public void testExcludedKeysNotExported() {
         assertFalse(json.contains(Prefs.PREF_API_KEY));
         assertFalse(json.contains(CtrlPermissions.PREF_NAME));
         assertFalse(json.contains("peer_skus"));
+        assertFalse(json.contains(Prefs.PREF_COLLECTOR_IP_KEY));
         assertFalse(json.contains("available_skus"));
         assertFalse(json.contains("unlock_token"));
         assertFalse(json.contains(Billing.SKU_PREF_PREFIX));