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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server.backup;
     18 
     19 import android.app.AppGlobals;
     20 import android.app.backup.BlobBackupHelper;
     21 import android.content.pm.IPackageManager;
     22 import android.os.UserHandle;
     23 import android.util.Slog;
     24 
     25 public class PermissionBackupHelper extends BlobBackupHelper {
     26     private static final String TAG = "PermissionBackup";
     27     private static final boolean DEBUG = false;
     28 
     29     // current schema of the backup state blob
     30     private static final int STATE_VERSION = 1;
     31 
     32     // key under which the permission-grant state blob is committed to backup
     33     private static final String KEY_PERMISSIONS = "permissions";
     34 
     35     public PermissionBackupHelper() {
     36         super(STATE_VERSION, KEY_PERMISSIONS);
     37     }
     38 
     39     @Override
     40     protected byte[] getBackupPayload(String key) {
     41         IPackageManager pm = AppGlobals.getPackageManager();
     42         if (DEBUG) {
     43             Slog.d(TAG, "Handling backup of " + key);
     44         }
     45         try {
     46             switch (key) {
     47                 case KEY_PERMISSIONS:
     48                     return pm.getPermissionGrantBackup(UserHandle.USER_SYSTEM);
     49 
     50                 default:
     51                     Slog.w(TAG, "Unexpected backup key " + key);
     52             }
     53         } catch (Exception e) {
     54             Slog.e(TAG, "Unable to store payload " + key);
     55         }
     56         return null;
     57     }
     58 
     59     @Override
     60     protected void applyRestoredPayload(String key, byte[] payload) {
     61         IPackageManager pm = AppGlobals.getPackageManager();
     62         if (DEBUG) {
     63             Slog.d(TAG, "Handling restore of " + key);
     64         }
     65         try {
     66             switch (key) {
     67                 case KEY_PERMISSIONS:
     68                     pm.restorePermissionGrants(payload, UserHandle.USER_SYSTEM);
     69                     break;
     70 
     71                 default:
     72                     Slog.w(TAG, "Unexpected restore key " + key);
     73             }
     74         } catch (Exception e) {
     75             Slog.w(TAG, "Unable to restore key " + key);
     76         }
     77     }
     78 }
     79