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175 lines
4.5 KiB
175 lines
4.5 KiB
import 'dart:convert';
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import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:pointycastle/impl.dart';
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import 'package:qr_code_scanner/qr_code_scanner.dart';
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import 'package:sqflite/sqflite.dart';
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import 'package:uuid/uuid.dart';
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import 'package:http/http.dart' as http;
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import '/components/custom_title_bar.dart';
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import '/database/models/friends.dart';
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import '/database/models/my_profile.dart';
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import '/utils/encryption/aes_helper.dart';
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import '/utils/encryption/crypto_utils.dart';
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import '/utils/storage/database.dart';
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import '/utils/strings.dart';
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import '/utils/storage/session_cookie.dart';
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import 'flash_message.dart';
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class QrReader extends StatefulWidget {
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const QrReader({
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Key? key,
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}) : super(key: key);
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@override
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State<QrReader> createState() => _QrReaderState();
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}
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class _QrReaderState extends State<QrReader> {
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final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
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Barcode? result;
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QRViewController? controller;
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// In order to get hot reload to work we need to pause the camera if the platform
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// is android, or resume the camera if the platform is iOS.
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@override
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void reassemble() {
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super.reassemble();
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if (Platform.isAndroid) {
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controller!.pauseCamera();
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} else if (Platform.isIOS) {
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controller!.resumeCamera();
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}
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: CustomTitleBar(
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title: Text(
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'Add Friend',
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style: TextStyle(
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fontSize: 16,
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fontWeight: FontWeight.w600,
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color: Theme.of(context).appBarTheme.toolbarTextStyle?.color
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)
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),
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showBack: true,
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backgroundColor: Colors.transparent,
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),
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body: Column(
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children: <Widget>[
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Expanded(
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flex: 5,
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child: QRView(
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key: qrKey,
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onQRViewCreated: _onQRViewCreated,
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formatsAllowed: const [BarcodeFormat.qrcode],
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overlay: QrScannerOverlayShape(),
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),
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),
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],
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),
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);
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}
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void _onQRViewCreated(QRViewController controller) {
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this.controller = controller;
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controller.scannedDataStream.listen((scanData) {
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addFriend(scanData)
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.then((dynamic ret) {
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if (ret) {
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// Delay exit to prevent exit mid way through rendering
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Future.delayed(Duration.zero, () {
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Navigator.of(context).pop();
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});
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}
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});
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});
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}
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@override
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void dispose() {
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controller?.dispose();
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super.dispose();
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}
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Future<bool> addFriend(Barcode scanData) async {
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Map<String, dynamic> friendJson = jsonDecode(scanData.code!);
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RSAPublicKey publicKey = CryptoUtils.rsaPublicKeyFromPem(
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String.fromCharCodes(
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base64.decode(
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friendJson['k']
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)
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)
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);
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MyProfile profile = await MyProfile.getProfile();
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var uuid = const Uuid();
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final symmetricKey1 = AesHelper.deriveKey(generateRandomString(32));
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final symmetricKey2 = AesHelper.deriveKey(generateRandomString(32));
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Friend request1 = Friend(
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id: uuid.v4(),
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userId: friendJson['i'],
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username: profile.username,
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friendId: profile.id,
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friendSymmetricKey: base64.encode(symmetricKey1),
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publicKey: profile.publicKey!,
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acceptedAt: DateTime.now(),
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);
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Friend request2 = Friend(
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id: uuid.v4(),
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userId: profile.id,
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friendId: friendJson['i'],
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username: friendJson['u'],
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friendSymmetricKey: base64.encode(symmetricKey2),
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publicKey: publicKey,
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acceptedAt: DateTime.now(),
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);
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String payload = jsonEncode([
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request1.payloadJson(),
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request2.payloadJson(),
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]);
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var resp = await http.post(
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await MyProfile.getServerUrl('api/v1/auth/friend_request/qr_code'),
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headers: <String, String>{
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'Content-Type': 'application/json; charset=UTF-8',
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'cookie': await getSessionCookie(),
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},
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body: payload,
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);
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if (resp.statusCode != 200) {
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showMessage(
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'Failed to add friend, please try again later',
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context
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);
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return false;
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}
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final db = await getDatabaseConnection();
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await db.insert(
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'friends',
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request1.toMap(),
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conflictAlgorithm: ConflictAlgorithm.replace,
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);
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await db.insert(
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'friends',
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request2.toMap(),
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conflictAlgorithm: ConflictAlgorithm.replace,
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);
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return true;
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}
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}
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