Encrypted messaging app
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import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:shared_preferences/shared_preferences.dart';
import '/utils/encryption/crypto_utils.dart';
import '/utils/encryption/aes_helper.dart';
import '/utils/storage/encryption_keys.dart';
import '/utils/storage/session_cookie.dart';
class LoginResponse {
final String status;
final String message;
final String asymmetricPublicKey;
final String asymmetricPrivateKey;
const LoginResponse({
required this.status,
required this.message,
required this.asymmetricPublicKey,
required this.asymmetricPrivateKey,
});
factory LoginResponse.fromJson(Map<String, dynamic> json) {
return LoginResponse(
status: json['status'],
message: json['message'],
asymmetricPublicKey: json['asymmetric_public_key'],
asymmetricPrivateKey: json['asymmetric_private_key'],
);
}
}
Future<LoginResponse> login(context, String username, String password) async {
final resp = await http.post(
Uri.parse('http://192.168.1.5:8080/api/v1/login'),
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(<String, String>{
'username': username,
'password': password,
}),
);
if (resp.statusCode != 200) {
throw Exception(resp.body);
}
String? rawCookie = resp.headers['set-cookie'];
if (rawCookie != null) {
int index = rawCookie.indexOf(';');
setSessionCookie((index == -1) ? rawCookie : rawCookie.substring(0, index));
}
LoginResponse response = LoginResponse.fromJson(jsonDecode(resp.body));
var rsaPrivPem = AesHelper.aesDecrypt(password, base64.decode(response.asymmetricPrivateKey));
debugPrint(rsaPrivPem);
var rsaPriv = CryptoUtils.rsaPrivateKeyFromPem(rsaPrivPem);
setPrivateKey(rsaPriv);
final preferences = await SharedPreferences.getInstance();
preferences.setBool('islogin', true);
return response;
}
class Login extends StatelessWidget {
const Login({Key? key}) : super(key: key);
static const String _title = 'Envelope';
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.cyan,
appBar: AppBar(
title: null,
automaticallyImplyLeading: true,
//`true` if you want Flutter to automatically add Back Button when needed,
//or `false` if you want to force your own back button every where
leading: IconButton(icon: const Icon(Icons.arrow_back),
onPressed:() => {
Navigator.pop(context)
}
)
),
body: const SafeArea(
child: LoginWidget(),
),
);
}
}
class LoginWidget extends StatefulWidget {
const LoginWidget({Key? key}) : super(key: key);
@override
State<LoginWidget> createState() => _LoginWidgetState();
}
class _LoginWidgetState extends State<LoginWidget> {
final _formKey = GlobalKey<FormState>();
TextEditingController usernameController = TextEditingController();
TextEditingController passwordController = TextEditingController();
@override
Widget build(BuildContext context) {
const TextStyle _inputTextStyle = TextStyle(fontSize: 18, color: Colors.black);
final ButtonStyle _buttonStyle = ElevatedButton.styleFrom(
primary: Colors.white,
onPrimary: Colors.cyan,
minimumSize: const Size.fromHeight(50),
padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),
textStyle: const TextStyle(
fontSize: 20,
fontWeight: FontWeight.bold,
color: Colors.red,
),
);
return Center(
child: Form(
key: _formKey,
child: Center(
child: Padding(
padding: const EdgeInsets.all(15),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
const Text('Login', style: TextStyle(fontSize: 35, color: Colors.white),),
const SizedBox(height: 30),
TextFormField(
controller: usernameController,
decoration: const InputDecoration(
hintText: 'Username',
),
style: _inputTextStyle,
// The validator receives the text that the user has entered.
validator: (value) {
if (value == null || value.isEmpty) {
return 'Create a username';
}
return null;
},
),
const SizedBox(height: 5),
TextFormField(
controller: passwordController,
obscureText: true,
enableSuggestions: false,
autocorrect: false,
decoration: const InputDecoration(
hintText: 'Password',
),
style: _inputTextStyle,
// The validator receives the text that the user has entered.
validator: (value) {
if (value == null || value.isEmpty) {
return 'Enter a password';
}
return null;
},
),
const SizedBox(height: 5),
ElevatedButton(
style: _buttonStyle,
onPressed: () {
if (_formKey.currentState!.validate()) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('Processing Data')),
);
login(
context,
usernameController.text,
passwordController.text,
).then((value) {
Navigator.
pushNamedAndRemoveUntil(
context,
'/home',
ModalRoute.withName('/home'),
);
}).catchError((error) {
print(error); // TODO: Show error on interface
});
}
},
child: const Text('Submit'),
),
],
)
)
)
)
);
}
}