mirror of https://github.com/beemdevelopment/Aegis
Add support for participating in Android's backup system
This adds an option for participating in Android's backup system. Two items are backed up: the ``files/aegis.json`` file and the entire ``shared_prefs`` directory. The option is disabled by default and can only be enabled if encryption is enabled as well. I tested this with Local Transport and Seedvault. To test with Local Transport, see: https://developer.android.com/guide/topics/data/testingbackup.pull/654/head
Alexander Bakker
4 years ago
parent
07c768893a
commit
f080eaa8f9
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package com.beemdevelopment.aegis;
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import android.app.backup.BackupAgent;
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import android.app.backup.BackupDataInput;
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import android.app.backup.BackupDataOutput;
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import android.app.backup.FullBackupDataOutput;
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import android.os.Build;
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import android.os.ParcelFileDescriptor;
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import android.util.Log;
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import com.beemdevelopment.aegis.util.IOUtils;
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import com.beemdevelopment.aegis.vault.VaultManager;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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public class AegisBackupAgent extends BackupAgent {
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private static final String TAG = BackupAgent.class.getSimpleName();
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private Preferences _prefs;
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@Override
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public void onCreate() {
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super.onCreate();
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_prefs = new Preferences(this);
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}
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@Override
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public synchronized void onFullBackup(FullBackupDataOutput data) throws IOException {
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Log.i(TAG, String.format("onFullBackup() called: flags=%d, quota=%d",
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Build.VERSION.SDK_INT >= Build.VERSION_CODES.P ? data.getTransportFlags() : -1,
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Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ? data.getQuota() : -1));
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if (!_prefs.isAndroidBackupsEnabled()) {
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Log.i(TAG, "onFullBackup() skipped: Android backups disabled in preferences");
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return;
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}
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// first copy the vault to the files/backup directory
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createBackupDir();
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File vaultBackupFile = getVaultBackupFile();
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try (FileInputStream inStream = VaultManager.getAtomicFile(this).openRead();
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FileOutputStream outStream = new FileOutputStream(vaultBackupFile)) {
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IOUtils.copy(inStream, outStream);
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} catch (IOException e) {
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Log.e(TAG, String.format("onFullBackup() failed: %s", e));
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deleteBackupDir();
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throw e;
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}
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// then call the original implementation so that fullBackupContent specified in AndroidManifest is read
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try {
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super.onFullBackup(data);
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} catch (IOException e) {
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Log.e(TAG, String.format("onFullBackup() failed: %s", e));
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throw e;
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} finally {
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deleteBackupDir();
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}
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Log.i(TAG, "onFullBackup() finished");
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}
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@Override
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public synchronized void onRestoreFile(ParcelFileDescriptor data, long size, File destination, int type, long mode, long mtime) throws IOException {
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Log.i(TAG, String.format("onRestoreFile() called: dest=%s", destination));
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super.onRestoreFile(data, size, destination, type, mode, mtime);
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File vaultBackupFile = getVaultBackupFile();
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if (destination.getCanonicalFile().equals(vaultBackupFile.getCanonicalFile())) {
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try (InputStream inStream = new FileInputStream(vaultBackupFile)) {
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VaultManager.writeToFile(this, inStream);
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} catch (IOException e) {
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Log.e(TAG, String.format("onRestoreFile() failed: dest=%s, error=%s", destination, e));
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throw e;
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} finally {
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deleteBackupDir();
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}
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}
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Log.i(TAG, String.format("onRestoreFile() finished: dest=%s", destination));
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}
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@Override
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public synchronized void onQuotaExceeded(long backupDataBytes, long quotaBytes) {
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super.onQuotaExceeded(backupDataBytes, quotaBytes);
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Log.e(TAG, String.format("onQuotaExceeded() called: backupDataBytes=%d, quotaBytes=%d", backupDataBytes, quotaBytes));
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}
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@Override
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public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState) throws IOException {
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}
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@Override
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public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) throws IOException {
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}
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private void createBackupDir() throws IOException {
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File dir = getVaultBackupFile().getParentFile();
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if (!dir.exists() && !dir.mkdir()) {
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throw new IOException(String.format("Unable to create backup directory: %s", dir.toString()));
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}
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}
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private void deleteBackupDir() {
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File dir = getVaultBackupFile().getParentFile();
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IOUtils.clearDirectory(dir, true);
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}
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private File getVaultBackupFile() {
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return new File(new File(getFilesDir(), "backup"), VaultManager.FILENAME);
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}
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}
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@ -0,0 +1,5 @@
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<?xml version="1.0" encoding="utf-8"?>
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<full-backup-content>
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<include domain="sharedpref" path="."/>
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<include domain="file" path="backup/aegis.json"/>
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</full-backup-content>
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