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Merge pull request #96 from SecUSo/feat/add-privacy-friendly-backup-s…
…upport Add privacy friendly backup support
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| [submodule "libs/privacy-friendly-backup-api"] | ||
| path = libs/privacy-friendly-backup-api | ||
| url = https://github.com/SecUSo/privacy-friendly-backup-api.git |
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21 changes: 21 additions & 0 deletions
21
app/src/main/java/org/secuso/privacyfriendlyfoodtracker/PFFoodTrackerApplication.kt
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| package org.secuso.privacyfriendlyfoodtracker | ||
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| import android.app.Application | ||
| import android.util.Log | ||
| import androidx.work.Configuration | ||
| import org.secuso.privacyfriendlybackup.api.pfa.BackupManager | ||
| import org.secuso.privacyfriendlyfoodtracker.backup.BackupCreator | ||
| import org.secuso.privacyfriendlyfoodtracker.backup.BackupRestorer | ||
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| class PFFoodTrackerApplication : Application(), Configuration.Provider { | ||
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| override fun onCreate() { | ||
| super.onCreate() | ||
| BackupManager.backupCreator = BackupCreator() | ||
| BackupManager.backupRestorer = BackupRestorer() | ||
| } | ||
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| override fun getWorkManagerConfiguration(): Configuration { | ||
| return Configuration.Builder().setMinimumLoggingLevel(Log.INFO).build() | ||
| } | ||
| } |
73 changes: 73 additions & 0 deletions
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app/src/main/java/org/secuso/privacyfriendlyfoodtracker/backup/BackupCreator.kt
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| package org.secuso.privacyfriendlyfoodtracker.backup | ||
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| import android.content.Context | ||
| import android.preference.PreferenceManager | ||
| import android.util.JsonWriter | ||
| import android.util.Log | ||
| import net.sqlcipher.database.SQLiteDatabase | ||
| import net.sqlcipher.database.SQLiteDatabaseHook | ||
| import org.secuso.privacyfriendlybackup.api.backup.DatabaseUtil | ||
| import org.secuso.privacyfriendlybackup.api.backup.PreferenceUtil | ||
| import org.secuso.privacyfriendlybackup.api.pfa.IBackupCreator | ||
| import org.secuso.privacyfriendlyfoodtracker.database.ApplicationDatabase | ||
| import org.secuso.privacyfriendlyfoodtracker.helpers.KeyGenHelper | ||
| import java.io.OutputStream | ||
| import java.io.OutputStreamWriter | ||
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| class BackupCreator : IBackupCreator { | ||
| override fun writeBackup(context: Context, outputStream: OutputStream) { | ||
| Log.d(TAG, "createBackup() started") | ||
| val outputStreamWriter = OutputStreamWriter(outputStream, Charsets.UTF_8) | ||
| val writer = JsonWriter(outputStreamWriter) | ||
| writer.setIndent("") | ||
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| try { | ||
| writer.beginObject() | ||
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| Log.d(TAG, "Writing database") | ||
| writer.name("database") | ||
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| SQLiteDatabase.loadLibs(context) | ||
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| if (context.getDatabasePath(ApplicationDatabase.DATABASE_NAME).exists()) { | ||
| val database = SQLiteDatabase.openDatabase( | ||
| context.getDatabasePath(ApplicationDatabase.DATABASE_NAME).path, | ||
| KeyGenHelper.getSecretKeyAsChar(context), | ||
| null, | ||
| SQLiteDatabase.OPEN_READONLY, | ||
| object : SQLiteDatabaseHook { | ||
| override fun preKey(database: SQLiteDatabase) {} | ||
| override fun postKey(database: SQLiteDatabase) { | ||
| database.rawExecSQL("PRAGMA cipher_compatibility = 3;") | ||
| } | ||
| }) | ||
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| DatabaseUtil.writeDatabase(writer, database) | ||
| database.close() | ||
| } else { | ||
| Log.d(TAG, "No database found") | ||
| writer.beginObject() | ||
| writer.endObject() | ||
| } | ||
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| Log.d(TAG, "Writing preferences") | ||
| writer.name("preferences") | ||
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| val pref = PreferenceManager.getDefaultSharedPreferences(context.applicationContext) | ||
| PreferenceUtil.writePreferences(writer, pref, arrayOf(KeyGenHelper.PREFERENCE_ENCRYPTED_KEY_NAME)) | ||
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| Log.d(TAG, "Writing files") | ||
| writer.endObject() | ||
| writer.close() | ||
| } catch (e: Exception) { | ||
| Log.e(TAG, "Error occurred", e) | ||
| e.printStackTrace() | ||
| } | ||
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| Log.d(TAG, "Backup created successfully") | ||
| } | ||
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| companion object { | ||
| const val TAG = "PFABackupCreator" | ||
| } | ||
| } |
126 changes: 126 additions & 0 deletions
126
app/src/main/java/org/secuso/privacyfriendlyfoodtracker/backup/BackupRestorer.kt
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| @@ -0,0 +1,126 @@ | ||
| package org.secuso.privacyfriendlyfoodtracker.backup | ||
|
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| import android.content.Context | ||
| import android.content.SharedPreferences | ||
| import android.preference.PreferenceManager | ||
| import android.util.JsonReader | ||
| import android.util.Log | ||
| import androidx.annotation.NonNull | ||
| import net.sqlcipher.database.SQLiteDatabase | ||
| import net.sqlcipher.database.SQLiteDatabaseHook | ||
| import org.secuso.privacyfriendlybackup.api.backup.DatabaseUtil | ||
| import org.secuso.privacyfriendlybackup.api.backup.FileUtil | ||
| import org.secuso.privacyfriendlybackup.api.pfa.IBackupRestorer | ||
| import org.secuso.privacyfriendlyfoodtracker.database.ApplicationDatabase | ||
| import org.secuso.privacyfriendlyfoodtracker.helpers.KeyGenHelper | ||
| import java.io.IOException | ||
| import java.io.InputStream | ||
| import java.io.InputStreamReader | ||
| import kotlin.system.exitProcess | ||
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| class BackupRestorer : IBackupRestorer { | ||
| @Throws(IOException::class) | ||
| private fun readDatabase(@NonNull reader: JsonReader, @NonNull context: Context) { | ||
| reader.beginObject() | ||
| val n1: String = reader.nextName() | ||
| if (n1 != "version") { | ||
| throw RuntimeException("Unknown value $n1") | ||
| } | ||
| val version: Int = reader.nextInt() | ||
| val n2: String = reader.nextName() | ||
| if (n2 != "content") { | ||
| throw RuntimeException("Unknown value $n2") | ||
| } | ||
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| Log.d(TAG, "Restoring database...") | ||
| val restoreDatabaseName = "restoreDatabase" | ||
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| // delete if file already exists | ||
| val restoreDatabaseFile = context.getDatabasePath(restoreDatabaseName) | ||
| if (restoreDatabaseFile.exists()) { | ||
| DatabaseUtil.deleteRoomDatabase(context, restoreDatabaseName) | ||
| } | ||
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| // check if key exists | ||
| if (!KeyGenHelper.isKeyGenerated()) { | ||
| Log.d(TAG, "No key found. Generating new key...") | ||
| KeyGenHelper.generateKey(context) | ||
| KeyGenHelper.generatePassphrase(context) | ||
| Log.d(TAG, "Key generated") | ||
| } | ||
| val databasePassword = KeyGenHelper.getSecretKeyAsChar(context) | ||
| // create new restore database | ||
| val db: SQLiteDatabase = | ||
| SQLiteDatabase.openOrCreateDatabase(context.getDatabasePath(restoreDatabaseName).path, databasePassword, null, object : SQLiteDatabaseHook { | ||
| override fun preKey(database: SQLiteDatabase?) {} | ||
| override fun postKey(database: SQLiteDatabase) { | ||
| database.rawExecSQL("PRAGMA cipher_compatibility = 3;") | ||
| } | ||
| }) | ||
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| db.beginTransaction() | ||
| db.version = version | ||
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| Log.d(TAG, "Copying database contents...") | ||
| DatabaseUtil.readDatabaseContent(reader, db) | ||
| db.setTransactionSuccessful() | ||
| db.endTransaction() | ||
| db.close() | ||
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| reader.endObject() | ||
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| // copy file to correct location | ||
| val actualDatabaseFile = context.getDatabasePath(ApplicationDatabase.DATABASE_NAME) | ||
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| DatabaseUtil.deleteRoomDatabase(context, ApplicationDatabase.DATABASE_NAME) | ||
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| FileUtil.copyFile(restoreDatabaseFile, actualDatabaseFile) | ||
| Log.d(TAG, "Database Restored") | ||
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| // delete restore database | ||
| DatabaseUtil.deleteRoomDatabase(context, restoreDatabaseName) | ||
| } | ||
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| @Throws(IOException::class) | ||
| private fun readPreferences(@NonNull reader: JsonReader, @NonNull context: Context) { | ||
| reader.beginObject() | ||
| val pref: SharedPreferences.Editor = PreferenceManager.getDefaultSharedPreferences(context).edit() | ||
| while (reader.hasNext()) { | ||
| val name: String = reader.nextName() | ||
| when (name) { | ||
| "IsFirstTimeLaunch" -> pref | ||
| .putBoolean(name, reader.nextBoolean()) | ||
| else -> throw RuntimeException("Unknown preference $name") | ||
| } | ||
| } | ||
| pref.commit() | ||
| reader.endObject() | ||
| } | ||
|
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| override fun restoreBackup(context: Context, restoreData: InputStream): Boolean { | ||
| return try { | ||
| val isReader = InputStreamReader(restoreData) | ||
| val reader = JsonReader(isReader) | ||
|
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| // START | ||
| reader.beginObject() | ||
| while (reader.hasNext()) { | ||
| val type: String = reader.nextName() | ||
| when (type) { | ||
| "database" -> readDatabase(reader, context) | ||
| "preferences" -> readPreferences(reader, context) | ||
| else -> throw RuntimeException("Can not parse type $type") | ||
| } | ||
| } | ||
| reader.endObject() | ||
| exitProcess(0) | ||
| } catch (e: Exception) { | ||
| false | ||
| } | ||
| } | ||
|
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| companion object { | ||
| const val TAG = "PFABackupRestorer" | ||
| } | ||
| } |
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