170 lines
5.2 KiB
Dart
170 lines
5.2 KiB
Dart
import 'dart:convert';
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import 'dart:io' as io;
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import 'package:flutter_secure_storage/flutter_secure_storage.dart';
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import 'package:path_provider/path_provider.dart';
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import 'package:photos/models/key_attributes.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import 'package:photos/utils/crypto_util.dart';
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class Configuration {
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Configuration._privateConstructor();
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static final Configuration instance = Configuration._privateConstructor();
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static const endpointKey = "endpoint";
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static const userIDKey = "user_id";
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static const emailKey = "email";
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static const tokenKey = "token";
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static const hasOptedForE2EKey = "has_opted_for_e2e_encryption";
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static const keyKey = "key";
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static const keyEncryptedKey = "encrypted_key";
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static const keyKekSalt = "kek_salt";
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static const keyKekHash = "kek_hash";
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static const keyKekHashSalt = "kek_hash_salt";
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static const keyEncryptedKeyIV = "encrypted_key_iv";
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SharedPreferences _preferences;
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FlutterSecureStorage _secureStorage;
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String _key;
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String _documentsDirectory;
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String _tempDirectory;
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String _thumbnailsDirectory;
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Future<void> init() async {
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_preferences = await SharedPreferences.getInstance();
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_secureStorage = FlutterSecureStorage();
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_documentsDirectory = (await getApplicationDocumentsDirectory()).path;
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_tempDirectory = _documentsDirectory + "/temp/";
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_thumbnailsDirectory = _documentsDirectory + "/thumbnails/";
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new io.Directory(_tempDirectory).createSync(recursive: true);
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new io.Directory(_thumbnailsDirectory).createSync(recursive: true);
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_key = await _secureStorage.read(key: keyKey);
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}
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Future<KeyAttributes> generateAndSaveKey(String passphrase) async {
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final key = CryptoUtil.getBase64EncodedSecureRandomString(length: 32);
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final kekSalt = CryptoUtil.getBase64EncodedSecureRandomString(length: 32);
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final kek =
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base64.encode(CryptoUtil.scrypt(passphrase, kekSalt, 32).codeUnits);
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final kekHashSalt =
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CryptoUtil.getBase64EncodedSecureRandomString(length: 32);
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final kekHash = CryptoUtil.scrypt(kek, kekHashSalt, 32);
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final iv = CryptoUtil.getBase64EncodedSecureRandomString(length: 32);
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final encryptedKey = CryptoUtil.encryptToBase64(key, kek, iv);
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final attributes =
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KeyAttributes(kekSalt, kekHash, kekHashSalt, encryptedKey, iv);
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await setKey(key);
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await setKeyAttributes(attributes);
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return attributes;
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}
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Future<void> decryptAndSaveKey(
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String passphrase, KeyAttributes attributes) async {
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final kek = base64.encode(
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CryptoUtil.scrypt(passphrase, attributes.kekSalt, 32).codeUnits);
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bool correctPassphrase =
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CryptoUtil.compareHash(kek, attributes.kekHash, attributes.kekHashSalt);
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if (!correctPassphrase) {
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throw Exception("Incorrect passphrase");
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}
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final key = CryptoUtil.decryptFromBase64(
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attributes.encryptedKey, kek, attributes.encryptedKeyIV);
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await setKey(key);
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}
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String getEndpoint() {
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return "192.168.0.106";
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}
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String getHttpEndpoint() {
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if (getEndpoint() == null) {
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return "";
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}
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return "http://" + getEndpoint() + ":8080";
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}
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void setEndpoint(String endpoint) async {
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await _preferences.setString(endpointKey, endpoint);
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}
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String getToken() {
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return _preferences.getString(tokenKey);
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}
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void setToken(String token) async {
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await _preferences.setString(tokenKey, token);
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}
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String getEmail() {
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return _preferences.getString(emailKey);
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}
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void setEmail(String email) async {
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await _preferences.setString(emailKey, email);
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}
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int getUserID() {
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return _preferences.getInt(userIDKey);
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}
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void setUserID(int userID) async {
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await _preferences.setInt(userIDKey, userID);
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}
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void setOptInForE2E(bool hasOptedForE2E) async {
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await _preferences.setBool(hasOptedForE2EKey, hasOptedForE2E);
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}
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bool hasOptedForE2E() {
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return true;
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// return _preferences.getBool(hasOptedForE2EKey);
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}
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Future<void> setKeyAttributes(KeyAttributes attributes) async {
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await _preferences.setString(keyKekSalt, attributes.kekSalt);
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await _preferences.setString(keyKekHash, attributes.kekHash);
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await _preferences.setString(keyKekHashSalt, attributes.kekHashSalt);
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await _preferences.setString(keyEncryptedKey, attributes.encryptedKey);
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await _preferences.setString(keyEncryptedKeyIV, attributes.encryptedKeyIV);
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}
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KeyAttributes getKeyAttributes() {
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return KeyAttributes(
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_preferences.getString(keyKekSalt),
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_preferences.getString(keyKekHash),
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_preferences.getString(keyKekHashSalt),
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_preferences.getString(keyEncryptedKey),
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_preferences.getString(keyEncryptedKeyIV));
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}
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String getEncryptedKey() {
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return _preferences.getString(keyEncryptedKey);
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}
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Future<void> setKey(String key) async {
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await _secureStorage.write(key: keyKey, value: key);
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_key = key;
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}
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String getKey() {
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return _key;
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}
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String getDocumentsDirectory() {
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return _documentsDirectory;
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}
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String getThumbnailsDirectory() {
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return _thumbnailsDirectory;
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}
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String getTempDirectory() {
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return _tempDirectory;
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}
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bool hasConfiguredAccount() {
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return getToken() != null && getKey() != null;
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}
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}
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