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      1 /*
      2  * Copyright (C) 2013 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.sharedstoragebackup;
     18 
     19 import android.app.Service;
     20 import android.app.backup.FullBackup;
     21 import android.app.backup.FullBackupDataOutput;
     22 import android.app.backup.IBackupManager;
     23 import android.content.Intent;
     24 import android.os.Environment;
     25 import android.os.IBinder;
     26 import android.os.ParcelFileDescriptor;
     27 import android.os.RemoteException;
     28 import android.util.Log;
     29 
     30 import java.io.File;
     31 import java.io.FileDescriptor;
     32 import java.io.FileOutputStream;
     33 import java.io.IOException;
     34 import java.util.ArrayList;
     35 
     36 import com.android.internal.backup.IObbBackupService;
     37 
     38 /**
     39  * Service that the Backup Manager Services delegates OBB backup/restore operations to,
     40  * because those require accessing external storage.
     41  *
     42  * {@hide}
     43  */
     44 public class ObbBackupService extends Service {
     45     static final String TAG = "ObbBackupService";
     46     static final boolean DEBUG = true;
     47 
     48     /**
     49      * IObbBackupService interface implementation
     50      */
     51     IObbBackupService mService = new IObbBackupService.Stub() {
     52         /*
     53          * Back up a package's OBB directory tree
     54          */
     55         @Override
     56         public void backupObbs(String packageName, ParcelFileDescriptor data,
     57                 int token, IBackupManager callbackBinder) {
     58             final FileDescriptor outFd = data.getFileDescriptor();
     59             try {
     60                 File obbDir = Environment.buildExternalStorageAppObbDirs(packageName)[0];
     61                 if (obbDir != null) {
     62                     if (obbDir.exists()) {
     63                         ArrayList<File> obbList = allFileContents(obbDir);
     64                         if (obbList != null) {
     65                             // okay, there's at least something there
     66                             if (DEBUG) {
     67                                 Log.i(TAG, obbList.size() + " files to back up");
     68                             }
     69                             final String rootPath = obbDir.getCanonicalPath();
     70                             final FullBackupDataOutput out = new FullBackupDataOutput(data);
     71                             for (File f : obbList) {
     72                                 final String filePath = f.getCanonicalPath();
     73                                 if (DEBUG) {
     74                                     Log.i(TAG, "storing: " + filePath);
     75                                 }
     76                                 FullBackup.backupToTar(packageName, FullBackup.OBB_TREE_TOKEN, null,
     77                                         rootPath, filePath, out);
     78                             }
     79                         }
     80                     }
     81                 }
     82             } catch (IOException e) {
     83                 Log.w(TAG, "Exception backing up OBBs for " + packageName, e);
     84             } finally {
     85                 // Send the EOD marker indicating that there is no more data
     86                 try {
     87                     FileOutputStream out = new FileOutputStream(outFd);
     88                     byte[] buf = new byte[4];
     89                     out.write(buf);
     90                 } catch (IOException e) {
     91                     Log.e(TAG, "Unable to finalize obb backup stream!");
     92                 }
     93 
     94                 try {
     95                     callbackBinder.opComplete(token, 0);
     96                 } catch (RemoteException e) {
     97                 }
     98             }
     99         }
    100 
    101         /*
    102          * Restore an OBB file for the given package from the incoming stream
    103          */
    104         @Override
    105         public void restoreObbFile(String packageName, ParcelFileDescriptor data,
    106                 long fileSize, int type, String path, long mode, long mtime,
    107                 int token, IBackupManager callbackBinder) {
    108             try {
    109                 File outFile = Environment.buildExternalStorageAppObbDirs(packageName)[0];
    110                 if (outFile != null) {
    111                     outFile = new File(outFile, path);
    112                 }
    113                 // outFile is null here if we couldn't get access to external storage,
    114                 // in which case restoreFile() will discard the data cleanly and let
    115                 // us proceed with the next file segment in the stream.  We pass -1
    116                 // for the file mode to suppress attempts to chmod() on shared storage.
    117                 FullBackup.restoreFile(data, fileSize, type, -1, mtime, outFile);
    118             } catch (IOException e) {
    119                 Log.i(TAG, "Exception restoring OBB " + path, e);
    120             } finally {
    121                 try {
    122                     callbackBinder.opComplete(token, 0);
    123                 } catch (RemoteException e) {
    124                 }
    125             }
    126         }
    127 
    128         ArrayList<File> allFileContents(File rootDir) {
    129             final ArrayList<File> files = new ArrayList<File>();
    130             final ArrayList<File> dirs = new ArrayList<File>();
    131 
    132             dirs.add(rootDir);
    133             while (!dirs.isEmpty()) {
    134                 File dir = dirs.remove(0);
    135                 File[] contents = dir.listFiles();
    136                 if (contents != null) {
    137                     for (File f : contents) {
    138                         if (f.isDirectory()) dirs.add(f);
    139                         else if (f.isFile()) files.add(f);
    140                     }
    141                 }
    142             }
    143             return files;
    144         }
    145     };
    146 
    147     @Override
    148     public IBinder onBind(Intent intent) {
    149         return mService.asBinder();
    150     }
    151 }
    152