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 17package com.android.server.backup; 18 19import android.app.AppGlobals; 20import android.app.backup.BlobBackupHelper; 21import android.content.pm.IPackageManager; 22import android.os.UserHandle; 23import android.util.Slog; 24 25public 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