content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.server.backup;
  
  import android.annotation.NonNull;
  import android.app.backup.BlobBackupHelper;
  import android.os.UserHandle;
  import android.permission.PermissionManagerInternal;
  import android.util.Slog;
  
  import com.android.server.LocalServices;
  
  public class PermissionBackupHelper extends BlobBackupHelper {
      private static final String TAG = "PermissionBackup";
      private static final boolean DEBUG = false;
  
      // current schema of the backup state blob
      private static final int STATE_VERSION = 1;
  
      // key under which the permission-grant state blob is committed to backup
      private static final String KEY_PERMISSIONS = "permissions";
  
      private final @NonNull UserHandle mUser;
  
      private final @NonNull PermissionManagerInternal mPermissionManager;
  
      public PermissionBackupHelper(int userId) {
          super(STATE_VERSION, KEY_PERMISSIONS);
  
          mUser = UserHandle.of(userId);
          mPermissionManager = LocalServices.getService(PermissionManagerInternal.class);
      }
  
      @Override
      protected byte[] getBackupPayload(String key) {
          if (DEBUG) {
              Slog.d(TAG, "Handling backup of " + key);
          }
          try {
              switch (key) {
                  case KEY_PERMISSIONS:
                      return mPermissionManager.backupRuntimePermissions(mUser);
  
                  default:
                      Slog.w(TAG, "Unexpected backup key " + key);
              }
          } catch (Exception e) {
              Slog.e(TAG, "Unable to store payload " + key);
          }
          return null;
      }
  
      @Override
      protected void applyRestoredPayload(String key, byte[] payload) {
          if (DEBUG) {
              Slog.d(TAG, "Handling restore of " + key);
          }
          try {
              switch (key) {
                  case KEY_PERMISSIONS:
                      mPermissionManager.restoreRuntimePermissions(payload, mUser);
                      break;
  
                  default:
                      Slog.w(TAG, "Unexpected restore key " + key);
              }
          } catch (Exception e) {
              Slog.w(TAG, "Unable to restore key " + key);
          }
      }
  }
  