Backup: added fail safes

app/src/main/java/eu/faircode/email/FairEmailBackupAgent.java

@@ -56,7 +56,8 @@ public class FairEmailBackupAgent extends BackupAgent {
     private static final String KEY_JSON = "eu.faircode.email.json";
 
     @Override
-    public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState) throws IOException {
+    public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState) {
+        try {
             DB db = DB.getInstance(this);
 
             SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
@@ -70,7 +71,6 @@ public class FairEmailBackupAgent extends BackupAgent {
             if (!enabled || !(encrypted || BuildConfig.DEBUG))
                 return;
 
-        try {
             JSONObject jroot = new JSONObject();
 
             JSONObject jsettings = new JSONObject();
@@ -141,10 +141,10 @@ public class FairEmailBackupAgent extends BackupAgent {
             out.writeUTF(dataHash);
         } catch (Throwable ex) {
             Log.e(ex);
-        }
+        } finally {
-
             EntityLog.log(this, "Backup end");
         }
+    }
 
     @Override
     public void onQuotaExceeded(long backupDataBytes, long quotaBytes) {
@@ -152,18 +152,17 @@ public class FairEmailBackupAgent extends BackupAgent {
     }
 
     @Override
-    public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) throws
+    public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) {
-            IOException {
+        try {
             EntityLog.log(this, "Restore start version=" + appVersionCode);
 
-        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
-
             while (data.readNextHeader()) {
                 String dataKey = data.getKey();
                 int dataSize = data.getDataSize();
                 EntityLog.log(this, "Restore key=" + dataKey + " size=" + dataSize);
 
-            if (KEY_JSON.equals(dataKey)) {
+                if (KEY_JSON.equals(dataKey))
+                    try {
                         byte[] dataBuf = new byte[dataSize];
                         data.readEntityData(dataBuf, 0, dataSize);
 
@@ -174,12 +173,12 @@ public class FairEmailBackupAgent extends BackupAgent {
                         dataBuf = bos.toByteArray();
                         EntityLog.log(this, "Restore decompressed=" + dataBuf.length);
 
-                try {
                         JSONObject jroot = new JSONObject(new String(dataBuf, StandardCharsets.UTF_8));
                         jroot.put("version", 1);
 
-                    JSONObject jsettings = jroot.getJSONObject("settings");
+                        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
                         SharedPreferences.Editor editor = prefs.edit();
+                        JSONObject jsettings = jroot.getJSONObject("settings");
                         editor.putBoolean("enabled", jsettings.optBoolean("enabled"));
                         editor.putInt("poll_interval", jsettings.optInt("poll_interval", 0));
                         String theme = jsettings.optString("theme", null);
@@ -237,13 +236,16 @@ public class FairEmailBackupAgent extends BackupAgent {
                     } catch (Throwable ex) {
                         Log.e(ex);
                     }
-            } else {
+                else {
                     data.skipEntityData();
                 }
             }
-
+        } catch (Throwable ex) {
+            Log.e(ex);
+        } finally {
             EntityLog.log(this, "Restore end");
         }
+    }
 
     @Override
     public void onRestoreFinished() {