| /* |
| * Copyright (C) 2014 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 android.app.backup; |
| |
| import android.content.Intent; |
| import android.content.pm.PackageInfo; |
| import android.os.IBinder; |
| import android.os.ParcelFileDescriptor; |
| import android.os.RemoteException; |
| |
| import com.android.internal.backup.IBackupTransport; |
| |
| /** |
| * Concrete class that provides a stable-API bridge between IBackupTransport |
| * and its implementations. |
| * |
| * @hide |
| */ |
| public class BackupTransport { |
| public static final int TRANSPORT_OK = 0; |
| public static final int TRANSPORT_ERROR = 1; |
| public static final int TRANSPORT_NOT_INITIALIZED = 2; |
| public static final int TRANSPORT_PACKAGE_REJECTED = 3; |
| public static final int AGENT_ERROR = 4; |
| public static final int AGENT_UNKNOWN = 5; |
| |
| IBackupTransport mBinderImpl = new TransportImpl(); |
| /** @hide */ |
| public IBinder getBinder() { |
| return mBinderImpl.asBinder(); |
| } |
| |
| // ------------------------------------------------------------------------------------ |
| // Transport self-description and general configuration interfaces |
| // |
| |
| /** |
| * Ask the transport for the name under which it should be registered. This will |
| * typically be its host service's component name, but need not be. |
| */ |
| public String name() { |
| throw new UnsupportedOperationException("Transport name() not implemented"); |
| } |
| |
| /** |
| * Ask the transport for an Intent that can be used to launch any internal |
| * configuration Activity that it wishes to present. For example, the transport |
| * may offer a UI for allowing the user to supply login credentials for the |
| * transport's off-device backend. |
| * |
| * If the transport does not supply any user-facing configuration UI, it should |
| * return null from this method. |
| * |
| * @return An Intent that can be passed to Context.startActivity() in order to |
| * launch the transport's configuration UI. This method will return null |
| * if the transport does not offer any user-facing configuration UI. |
| */ |
| public Intent configurationIntent() { |
| return null; |
| } |
| |
| /** |
| * On demand, supply a one-line string that can be shown to the user that |
| * describes the current backend destination. For example, a transport that |
| * can potentially associate backup data with arbitrary user accounts should |
| * include the name of the currently-active account here. |
| * |
| * @return A string describing the destination to which the transport is currently |
| * sending data. This method should not return null. |
| */ |
| public String currentDestinationString() { |
| throw new UnsupportedOperationException( |
| "Transport currentDestinationString() not implemented"); |
| } |
| |
| /** |
| * Ask the transport where, on local device storage, to keep backup state blobs. |
| * This is per-transport so that mock transports used for testing can coexist with |
| * "live" backup services without interfering with the live bookkeeping. The |
| * returned string should be a name that is expected to be unambiguous among all |
| * available backup transports; the name of the class implementing the transport |
| * is a good choice. |
| * |
| * @return A unique name, suitable for use as a file or directory name, that the |
| * Backup Manager could use to disambiguate state files associated with |
| * different backup transports. |
| */ |
| public String transportDirName() { |
| throw new UnsupportedOperationException( |
| "Transport transportDirName() not implemented"); |
| } |
| |
| // ------------------------------------------------------------------------------------ |
| // Device-level operations common to both key/value and full-data storage |
| |
| /** |
| * Initialize the server side storage for this device, erasing all stored data. |
| * The transport may send the request immediately, or may buffer it. After |
| * this is called, {@link #finishBackup} will be called to ensure the request |
| * is sent and received successfully. |
| * |
| * @return One of {@link BackupTransport#TRANSPORT_OK} (OK so far) or |
| * {@link BackupTransport#TRANSPORT_ERROR} (on network error or other failure). |
| */ |
| public int initializeDevice() { |
| return BackupTransport.TRANSPORT_ERROR; |
| } |
| |
| /** |
| * Erase the given application's data from the backup destination. This clears |
| * out the given package's data from the current backup set, making it as though |
| * the app had never yet been backed up. After this is called, {@link finishBackup} |
| * must be called to ensure that the operation is recorded successfully. |
| * |
| * @return the same error codes as {@link #performBackup}. |
| */ |
| public int clearBackupData(PackageInfo packageInfo) { |
| return BackupTransport.TRANSPORT_ERROR; |
| } |
| |
| /** |
| * Finish sending application data to the backup destination. This must be |
| * called after {@link #performBackup}, {@link #performFullBackup}, or {@link clearBackupData} |
| * to ensure that all data is sent and the operation properly finalized. Only when this |
| * method returns true can a backup be assumed to have succeeded. |
| * |
| * @return the same error codes as {@link #performBackup} or {@link #performFullBackup}. |
| */ |
| public int finishBackup() { |
| return BackupTransport.TRANSPORT_ERROR; |
| } |
| |
| // ------------------------------------------------------------------------------------ |
| // Key/value incremental backup support interfaces |
| |
| /** |
| * Verify that this is a suitable time for a key/value backup pass. This should return zero |
| * if a backup is reasonable right now, some positive value otherwise. This method |
| * will be called outside of the {@link #performBackup}/{@link #finishBackup} pair. |
| * |
| * <p>If this is not a suitable time for a backup, the transport should return a |
| * backoff delay, in milliseconds, after which the Backup Manager should try again. |
| * |
| * @return Zero if this is a suitable time for a backup pass, or a positive time delay |
| * in milliseconds to suggest deferring the backup pass for a while. |
| */ |
| public long requestBackupTime() { |
| return 0; |
| } |
| |
| /** |
| * Send one application's key/value data update to the backup destination. The |
| * transport may send the data immediately, or may buffer it. After this is called, |
| * {@link #finishBackup} will be called to ensure the data is sent and recorded successfully. |
| * |
| * @param packageInfo The identity of the application whose data is being backed up. |
| * This specifically includes the signature list for the package. |
| * @param data The data stream that resulted from invoking the application's |
| * BackupService.doBackup() method. This may be a pipe rather than a file on |
| * persistent media, so it may not be seekable. |
| * @param wipeAllFirst When true, <i>all</i> backed-up data for the current device/account |
| * must be erased prior to the storage of the data provided here. The purpose of this |
| * is to provide a guarantee that no stale data exists in the restore set when the |
| * device begins providing incremental backups. |
| * @return one of {@link BackupTransport#TRANSPORT_OK} (OK so far), |
| * {@link BackupTransport#TRANSPORT_ERROR} (on network error or other failure), or |
| * {@link BackupTransport#TRANSPORT_NOT_INITIALIZED} (if the backend dataset has |
| * become lost due to inactivity purge or some other reason and needs re-initializing) |
| */ |
| public int performBackup(PackageInfo packageInfo, ParcelFileDescriptor inFd) { |
| return BackupTransport.TRANSPORT_ERROR; |
| } |
| |
| // ------------------------------------------------------------------------------------ |
| // Key/value dataset restore interfaces |
| |
| /** |
| * Get the set of all backups currently available over this transport. |
| * |
| * @return Descriptions of the set of restore images available for this device, |
| * or null if an error occurred (the attempt should be rescheduled). |
| **/ |
| public RestoreSet[] getAvailableRestoreSets() { |
| return null; |
| } |
| |
| /** |
| * Get the identifying token of the backup set currently being stored from |
| * this device. This is used in the case of applications wishing to restore |
| * their last-known-good data. |
| * |
| * @return A token that can be passed to {@link #startRestore}, or 0 if there |
| * is no backup set available corresponding to the current device state. |
| */ |
| public long getCurrentRestoreSet() { |
| return 0; |
| } |
| |
| /** |
| * Start restoring application data from backup. After calling this function, |
| * alternate calls to {@link #nextRestorePackage} and {@link #nextRestoreData} |
| * to walk through the actual application data. |
| * |
| * @param token A backup token as returned by {@link #getAvailableRestoreSets} |
| * or {@link #getCurrentRestoreSet}. |
| * @param packages List of applications to restore (if data is available). |
| * Application data will be restored in the order given. |
| * @return One of {@link BackupTransport#TRANSPORT_OK} (OK so far, call |
| * {@link #nextRestorePackage}) or {@link BackupTransport#TRANSPORT_ERROR} |
| * (an error occurred, the restore should be aborted and rescheduled). |
| */ |
| public int startRestore(long token, PackageInfo[] packages) { |
| return BackupTransport.TRANSPORT_ERROR; |
| } |
| |
| /** |
| * Get the package name of the next application with data in the backup store. |
| * |
| * @return The name of one of the packages supplied to {@link #startRestore}, |
| * or "" (the empty string) if no more backup data is available, |
| * or null if an error occurred (the restore should be aborted and rescheduled). |
| */ |
| public String nextRestorePackage() { |
| return null; |
| } |
| |
| /** |
| * Get the data for the application returned by {@link #nextRestorePackage}. |
| * @param data An open, writable file into which the backup data should be stored. |
| * @return the same error codes as {@link #startRestore}. |
| */ |
| public int getRestoreData(ParcelFileDescriptor outFd) { |
| return BackupTransport.TRANSPORT_ERROR; |
| } |
| |
| /** |
| * End a restore session (aborting any in-process data transfer as necessary), |
| * freeing any resources and connections used during the restore process. |
| */ |
| public void finishRestore() { |
| throw new UnsupportedOperationException( |
| "Transport finishRestore() not implemented"); |
| } |
| |
| // ------------------------------------------------------------------------------------ |
| // Full backup interfaces |
| |
| /** |
| * Verify that this is a suitable time for a full-data backup pass. This should return zero |
| * if a backup is reasonable right now, some positive value otherwise. This method |
| * will be called outside of the {@link #performFullBackup}/{@link #finishBackup} pair. |
| * |
| * <p>If this is not a suitable time for a backup, the transport should return a |
| * backoff delay, in milliseconds, after which the Backup Manager should try again. |
| * |
| * @return Zero if this is a suitable time for a backup pass, or a positive time delay |
| * in milliseconds to suggest deferring the backup pass for a while. |
| * |
| * @see #requestBackupTime() |
| */ |
| public long requestFullBackupTime() { |
| return 0; |
| } |
| |
| /** |
| * Begin the process of sending an application's full-data archive to the backend. |
| * The description of the package whose data will be delivered is provided, as well as |
| * the socket file descriptor on which the transport will receive the data itself. |
| * |
| * <p>If the package is not eligible for backup, the transport should return |
| * {@link BackupTransport#TRANSPORT_PACKAGE_REJECTED}. In this case the system will |
| * simply proceed with the next candidate if any, or finish the full backup operation |
| * if all apps have been processed. |
| * |
| * <p>After the transport returns {@link BackupTransport#TRANSPORT_OK} from this |
| * method, the OS will proceed to call {@link #sendBackupData()} one or more times |
| * to deliver the application's data as a streamed tarball. The transport should not |
| * read() from the socket except as instructed to via the {@link #sendBackupData(int)} |
| * method. |
| * |
| * <p>After all data has been delivered to the transport, the system will call |
| * {@link #finishBackup()}. At this point the transport should commit the data to |
| * its datastore, if appropriate, and close the socket that had been provided in |
| * {@link #performFullBackup(PackageInfo, ParcelFileDescriptor)}. |
| * |
| * @param targetPackage The package whose data is to follow. |
| * @param socket The socket file descriptor through which the data will be provided. |
| * If the transport returns {@link #TRANSPORT_PACKAGE_REJECTED} here, it must still |
| * close this file descriptor now; otherwise it should be cached for use during |
| * succeeding calls to {@link #sendBackupData(int)}, and closed in response to |
| * {@link #finishBackup()}. |
| * @return TRANSPORT_PACKAGE_REJECTED to indicate that the stated application is not |
| * to be backed up; TRANSPORT_OK to indicate that the OS may proceed with delivering |
| * backup data; TRANSPORT_ERROR to indicate a fatal error condition that precludes |
| * performing a backup at this time. |
| */ |
| public int performFullBackup(PackageInfo targetPackage, ParcelFileDescriptor socket) { |
| return BackupTransport.TRANSPORT_PACKAGE_REJECTED; |
| } |
| |
| /** |
| * Tells the transport to read {@code numBytes} bytes of data from the socket file |
| * descriptor provided in the {@link #performFullBackup(PackageInfo, ParcelFileDescriptor)} |
| * call, and deliver those bytes to the datastore. |
| * |
| * @param numBytes The number of bytes of tarball data available to be read from the |
| * socket. |
| * @return TRANSPORT_OK on successful processing of the data; TRANSPORT_ERROR to |
| * indicate a fatal error situation. If an error is returned, the system will |
| * call finishBackup() and stop attempting backups until after a backoff and retry |
| * interval. |
| */ |
| public int sendBackupData(int numBytes) { |
| return BackupTransport.TRANSPORT_ERROR; |
| } |
| |
| /** |
| * Bridge between the actual IBackupTransport implementation and the stable API. If the |
| * binder interface needs to change, we use this layer to translate so that we can |
| * (if appropriate) decouple those framework-side changes from the BackupTransport |
| * implementations. |
| */ |
| class TransportImpl extends IBackupTransport.Stub { |
| |
| @Override |
| public String name() throws RemoteException { |
| return BackupTransport.this.name(); |
| } |
| |
| @Override |
| public Intent configurationIntent() throws RemoteException { |
| return BackupTransport.this.configurationIntent(); |
| } |
| |
| @Override |
| public String currentDestinationString() throws RemoteException { |
| return BackupTransport.this.currentDestinationString(); |
| } |
| |
| @Override |
| public String transportDirName() throws RemoteException { |
| return BackupTransport.this.transportDirName(); |
| } |
| |
| @Override |
| public long requestBackupTime() throws RemoteException { |
| return BackupTransport.this.requestBackupTime(); |
| } |
| |
| @Override |
| public int initializeDevice() throws RemoteException { |
| return BackupTransport.this.initializeDevice(); |
| } |
| |
| @Override |
| public int performBackup(PackageInfo packageInfo, ParcelFileDescriptor inFd) |
| throws RemoteException { |
| return BackupTransport.this.performBackup(packageInfo, inFd); |
| } |
| |
| @Override |
| public int clearBackupData(PackageInfo packageInfo) throws RemoteException { |
| return BackupTransport.this.clearBackupData(packageInfo); |
| } |
| |
| @Override |
| public int finishBackup() throws RemoteException { |
| return BackupTransport.this.finishBackup(); |
| } |
| |
| @Override |
| public RestoreSet[] getAvailableRestoreSets() throws RemoteException { |
| return BackupTransport.this.getAvailableRestoreSets(); |
| } |
| |
| @Override |
| public long getCurrentRestoreSet() throws RemoteException { |
| return BackupTransport.this.getCurrentRestoreSet(); |
| } |
| |
| @Override |
| public int startRestore(long token, PackageInfo[] packages) throws RemoteException { |
| return BackupTransport.this.startRestore(token, packages); |
| } |
| |
| @Override |
| public String nextRestorePackage() throws RemoteException { |
| return BackupTransport.this.nextRestorePackage(); |
| } |
| |
| @Override |
| public int getRestoreData(ParcelFileDescriptor outFd) throws RemoteException { |
| return BackupTransport.this.getRestoreData(outFd); |
| } |
| |
| @Override |
| public void finishRestore() throws RemoteException { |
| BackupTransport.this.finishRestore(); |
| } |
| } |
| } |