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 onBind(Intent intent)148 public IBinder onBind(Intent intent) { 149 return mService.asBinder(); 150 } 151 } 152