content: /*
   * Copyright (C) 2017 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.fullbackup;
  
  import static com.android.server.backup.BackupManagerService.MORE_DEBUG;
  import static com.android.server.backup.BackupManagerService.TAG;
  import static com.android.server.backup.UserBackupManagerService.OP_TYPE_BACKUP_WAIT;
  
  import android.app.backup.IBackupManager;
  import android.content.ComponentName;
  import android.content.Context;
  import android.content.Intent;
  import android.content.ServiceConnection;
  import android.content.pm.PackageInfo;
  import android.os.IBinder;
  import android.os.ParcelFileDescriptor;
  import android.os.UserHandle;
  import android.util.Slog;
  
  import com.android.internal.backup.IObbBackupService;
  import com.android.internal.util.Preconditions;
  import com.android.server.backup.BackupAgentTimeoutParameters;
  import com.android.server.backup.UserBackupManagerService;
  import com.android.server.backup.utils.FullBackupUtils;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  /**
   * Full backup/restore to a file/socket.
   */
  public class FullBackupObbConnection implements ServiceConnection {
  
      private UserBackupManagerService backupManagerService;
      volatile IObbBackupService mService;
      private final BackupAgentTimeoutParameters mAgentTimeoutParameters;
  
      public FullBackupObbConnection(UserBackupManagerService backupManagerService) {
          this.backupManagerService = backupManagerService;
          mService = null;
          mAgentTimeoutParameters = Preconditions.checkNotNull(
                  backupManagerService.getAgentTimeoutParameters(),
                  "Timeout parameters cannot be null");
      }
  
      public void establish() {
          if (MORE_DEBUG) {
              Slog.i(TAG, "Initiating bind of OBB service on " + this);
          }
          Intent obbIntent = new Intent().setComponent(new ComponentName(
                  "com.android.sharedstoragebackup",
                  "com.android.sharedstoragebackup.ObbBackupService"));
          backupManagerService.getContext().bindServiceAsUser(
                  obbIntent, this, Context.BIND_AUTO_CREATE, UserHandle.SYSTEM);
      }
  
      public void tearDown() {
          backupManagerService.getContext().unbindService(this);
      }
  
      public boolean backupObbs(PackageInfo pkg, OutputStream out) {
          boolean success = false;
          waitForConnection();
  
          ParcelFileDescriptor[] pipes = null;
          try {
              pipes = ParcelFileDescriptor.createPipe();
              int token = backupManagerService.generateRandomIntegerToken();
              long fullBackupAgentTimeoutMillis =
                      mAgentTimeoutParameters.getFullBackupAgentTimeoutMillis();
              backupManagerService.prepareOperationTimeout(
                      token, fullBackupAgentTimeoutMillis, null, OP_TYPE_BACKUP_WAIT);
              mService.backupObbs(pkg.packageName, pipes[1], token,
                      backupManagerService.getBackupManagerBinder());
              FullBackupUtils.routeSocketDataToOutput(pipes[0], out);
              success = backupManagerService.waitUntilOperationComplete(token);
          } catch (Exception e) {
              Slog.w(TAG, "Unable to back up OBBs for " + pkg, e);
          } finally {
              try {
                  out.flush();
                  if (pipes != null) {
                      if (pipes[0] != null) {
                          pipes[0].close();
                      }
                      if (pipes[1] != null) {
                          pipes[1].close();
                      }
                  }
              } catch (IOException e) {
                  Slog.w(TAG, "I/O error closing down OBB backup", e);
              }
          }
          return success;
      }
  
      public void restoreObbFile(String pkgName, ParcelFileDescriptor data,
              long fileSize, int type, String path, long mode, long mtime,
              int token, IBackupManager callbackBinder) {
          waitForConnection();
  
          try {
              mService.restoreObbFile(pkgName, data, fileSize, type, path, mode, mtime,
                      token, callbackBinder);
          } catch (Exception e) {
              Slog.w(TAG, "Unable to restore OBBs for " + pkgName, e);
          }
      }
  
      private void waitForConnection() {
          synchronized (this) {
              while (mService == null) {
                  if (MORE_DEBUG) {
                      Slog.i(TAG, "...waiting for OBB service binding...");
                  }
                  try {
                      this.wait();
                  } catch (InterruptedException e) { /* never interrupted */ }
              }
              if (MORE_DEBUG) {
                  Slog.i(TAG, "Connected to OBB service; continuing");
              }
          }
      }
  
      @Override
      public void onServiceConnected(ComponentName name, IBinder service) {
          synchronized (this) {
              mService = IObbBackupService.Stub.asInterface(service);
              if (MORE_DEBUG) {
                  Slog.i(TAG, "OBB service connection " + mService + " connected on " + this);
              }
              this.notifyAll();
          }
      }
  
      @Override
      public void onServiceDisconnected(ComponentName name) {
          synchronized (this) {
              mService = null;
              if (MORE_DEBUG) {
                  Slog.i(TAG, "OBB service connection disconnected on " + this);
              }
              this.notifyAll();
          }
      }
  
  }
  