Revert "feat: Use sembast over sqflite"
This reverts commit 2fbf7376f6b464c60efcb3e8448c0beac7131638.onboarding
Krille Fear
4 years ago
parent
b2341bf5f6
commit
1674a3c30f
@ -1,120 +0,0 @@
|
||||
//@dart=2.12
|
||||
|
||||
import 'dart:convert';
|
||||
import 'dart:math';
|
||||
import 'dart:typed_data';
|
||||
|
||||
import 'package:crypto/crypto.dart';
|
||||
import 'package:encrypt/encrypt.dart';
|
||||
import 'package:sembast/sembast.dart';
|
||||
|
||||
var _random = Random.secure();
|
||||
|
||||
/// Random bytes generator
|
||||
Uint8List _randBytes(int length) {
|
||||
return Uint8List.fromList(
|
||||
List<int>.generate(length, (i) => _random.nextInt(256)));
|
||||
}
|
||||
|
||||
/// Generate an encryption password based on a user input password
|
||||
///
|
||||
/// It uses MD5 which generates a 16 bytes blob, size needed for Salsa20
|
||||
Uint8List _generateEncryptPassword(String password) {
|
||||
final blob = Uint8List.fromList(md5.convert(utf8.encode(password)).bytes);
|
||||
assert(blob.length == 16);
|
||||
return blob;
|
||||
}
|
||||
|
||||
/// Salsa20 based encoder
|
||||
class _EncryptEncoder extends Converter<dynamic, String> {
|
||||
final Salsa20 salsa20;
|
||||
|
||||
_EncryptEncoder(this.salsa20);
|
||||
|
||||
@override
|
||||
String convert(dynamic input) {
|
||||
// Generate random initial value
|
||||
final iv = _randBytes(8);
|
||||
final ivEncoded = base64.encode(iv);
|
||||
assert(ivEncoded.length == 12);
|
||||
|
||||
// Encode the input value
|
||||
final encoded =
|
||||
Encrypter(salsa20).encrypt(json.encode(input), iv: IV(iv)).base64;
|
||||
|
||||
// Prepend the initial value
|
||||
return '$ivEncoded$encoded';
|
||||
}
|
||||
}
|
||||
|
||||
/// Salsa20 based decoder
|
||||
class _EncryptDecoder extends Converter<String, dynamic> {
|
||||
final Salsa20 salsa20;
|
||||
|
||||
_EncryptDecoder(this.salsa20);
|
||||
|
||||
@override
|
||||
dynamic convert(String input) {
|
||||
// Read the initial value that was prepended
|
||||
assert(input.length >= 12);
|
||||
final iv = base64.decode(input.substring(0, 12));
|
||||
|
||||
// Extract the real input
|
||||
input = input.substring(12);
|
||||
|
||||
// Decode the input
|
||||
final decoded =
|
||||
json.decode(Encrypter(salsa20).decrypt64(input, iv: IV(iv)));
|
||||
if (decoded is Map) {
|
||||
return decoded.cast<String, dynamic>();
|
||||
}
|
||||
return decoded;
|
||||
}
|
||||
}
|
||||
|
||||
/// Salsa20 based Codec
|
||||
class _EncryptCodec extends Codec<dynamic, String> {
|
||||
late _EncryptEncoder _encoder;
|
||||
late _EncryptDecoder _decoder;
|
||||
|
||||
_EncryptCodec(Uint8List passwordBytes) {
|
||||
final salsa20 = Salsa20(Key(passwordBytes));
|
||||
_encoder = _EncryptEncoder(salsa20);
|
||||
_decoder = _EncryptDecoder(salsa20);
|
||||
}
|
||||
|
||||
@override
|
||||
Converter<String, dynamic> get decoder => _decoder;
|
||||
|
||||
@override
|
||||
Converter<dynamic, String> get encoder => _encoder;
|
||||
}
|
||||
|
||||
/// Our plain text signature
|
||||
const _encryptCodecSignature = 'encrypt';
|
||||
|
||||
/// Create a codec to use to open a database with encrypted stored data.
|
||||
///
|
||||
/// Hash (md5) of the password is used (but never stored) as a key to encrypt
|
||||
/// the data using the Salsa20 algorithm with a random (8 bytes) initial value
|
||||
///
|
||||
/// This is just used as a demonstration and should not be considered as a
|
||||
/// reference since its implementation (and storage format) might change.
|
||||
///
|
||||
/// No performance metrics has been made to check whether this is a viable
|
||||
/// solution for big databases.
|
||||
///
|
||||
/// The usage is then
|
||||
///
|
||||
/// ```dart
|
||||
/// // Initialize the encryption codec with a user password
|
||||
/// var codec = getEncryptSembastCodec(password: '[your_user_password]');
|
||||
/// // Open the database with the codec
|
||||
/// Database db = await factory.openDatabase(dbPath, codec: codec);
|
||||
///
|
||||
/// // ...your database is ready to use
|
||||
/// ```
|
||||
SembastCodec getEncryptSembastCodec({required String password}) => SembastCodec(
|
||||
signature: _encryptCodecSignature,
|
||||
codec: _EncryptCodec(_generateEncryptPassword(password)),
|
||||
);
|
||||
@ -1,131 +0,0 @@
|
||||
import 'dart:io';
|
||||
import 'dart:typed_data';
|
||||
|
||||
import 'package:flutter/foundation.dart' hide Key;
|
||||
import 'package:flutter/services.dart';
|
||||
|
||||
import 'package:encrypt/encrypt.dart';
|
||||
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
|
||||
import 'package:matrix/matrix.dart';
|
||||
import 'package:path_provider/path_provider.dart';
|
||||
import 'package:sembast/sembast.dart';
|
||||
import 'package:sembast/sembast_io.dart';
|
||||
import 'package:sembast_web/sembast_web.dart';
|
||||
|
||||
import '../platform_infos.dart';
|
||||
import 'codec.dart';
|
||||
|
||||
class FlutterMatrixSembastDatabaseOld extends MatrixSembastDatabase {
|
||||
FlutterMatrixSembastDatabaseOld(
|
||||
String name, {
|
||||
SembastCodec codec,
|
||||
String path,
|
||||
DatabaseFactory dbFactory,
|
||||
}) : super(
|
||||
name,
|
||||
codec: codec,
|
||||
path: path,
|
||||
dbFactory: dbFactory,
|
||||
);
|
||||
|
||||
static const String _cipherStorageKey = 'sembast_encryption_key';
|
||||
static const int _cipherStorageKeyLength = 512;
|
||||
|
||||
static Future<FlutterMatrixSembastDatabaseOld> databaseBuilder(
|
||||
Client client) async {
|
||||
Logs().d('Open Sembast...');
|
||||
SembastCodec codec;
|
||||
try {
|
||||
// Workaround for secure storage is calling Platform.operatingSystem on web
|
||||
if (kIsWeb) throw MissingPluginException();
|
||||
|
||||
const secureStorage = FlutterSecureStorage();
|
||||
final containsEncryptionKey =
|
||||
await secureStorage.containsKey(key: _cipherStorageKey);
|
||||
if (!containsEncryptionKey) {
|
||||
final key = SecureRandom(_cipherStorageKeyLength).base64;
|
||||
await secureStorage.write(
|
||||
key: _cipherStorageKey,
|
||||
value: key,
|
||||
);
|
||||
}
|
||||
|
||||
// workaround for if we just wrote to the key and it still doesn't exist
|
||||
final rawEncryptionKey = await secureStorage.read(key: _cipherStorageKey);
|
||||
if (rawEncryptionKey == null) throw MissingPluginException();
|
||||
|
||||
codec = getEncryptSembastCodec(password: rawEncryptionKey);
|
||||
} on MissingPluginException catch (_) {
|
||||
Logs().i('Sembast encryption is not supported on this platform');
|
||||
}
|
||||
|
||||
final db = FlutterMatrixSembastDatabaseOld(
|
||||
client.clientName,
|
||||
codec: codec,
|
||||
path: await _findDatabasePath(client),
|
||||
dbFactory: kIsWeb ? databaseFactoryWeb : databaseFactoryIo,
|
||||
);
|
||||
await db.open();
|
||||
Logs().d('Sembast is ready');
|
||||
return db;
|
||||
}
|
||||
|
||||
static Future<String> _findDatabasePath(Client client) async {
|
||||
String path = client.clientName;
|
||||
if (!kIsWeb) {
|
||||
Directory directory;
|
||||
try {
|
||||
directory = await getApplicationSupportDirectory();
|
||||
} catch (_) {
|
||||
try {
|
||||
directory = await getLibraryDirectory();
|
||||
} catch (_) {
|
||||
directory = Directory.current;
|
||||
}
|
||||
}
|
||||
path = '${directory.path}${client.clientName}.db';
|
||||
}
|
||||
return path;
|
||||
}
|
||||
|
||||
@override
|
||||
int get maxFileSize => supportsFileStoring ? 100 * 1024 * 1024 : 0;
|
||||
@override
|
||||
bool get supportsFileStoring => (PlatformInfos.isIOS ||
|
||||
PlatformInfos.isAndroid ||
|
||||
PlatformInfos.isDesktop);
|
||||
|
||||
Future<String> _getFileStoreDirectory() async {
|
||||
try {
|
||||
try {
|
||||
return (await getApplicationSupportDirectory()).path;
|
||||
} catch (_) {
|
||||
return (await getApplicationDocumentsDirectory()).path;
|
||||
}
|
||||
} catch (_) {
|
||||
return (await getDownloadsDirectory()).path;
|
||||
}
|
||||
}
|
||||
|
||||
@override
|
||||
Future<Uint8List> getFile(Uri mxcUri) async {
|
||||
if (!supportsFileStoring) return null;
|
||||
final tempDirectory = await _getFileStoreDirectory();
|
||||
final file =
|
||||
File('$tempDirectory/${Uri.encodeComponent(mxcUri.toString())}');
|
||||
if (await file.exists() == false) return null;
|
||||
final bytes = await file.readAsBytes();
|
||||
return bytes;
|
||||
}
|
||||
|
||||
@override
|
||||
Future storeFile(Uri mxcUri, Uint8List bytes, int time) async {
|
||||
if (!supportsFileStoring) return null;
|
||||
final tempDirectory = await _getFileStoreDirectory();
|
||||
final file =
|
||||
File('$tempDirectory/${Uri.encodeComponent(mxcUri.toString())}');
|
||||
if (await file.exists()) return;
|
||||
await file.writeAsBytes(bytes);
|
||||
return;
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue