Encrypted messaging app
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import 'dart:typed_data';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import '/utils/encryption/aes_helper.dart';
import '/utils/encryption/crypto_utils.dart';
class SignupResponse {
final String status;
final String message;
const SignupResponse({
required this.status,
required this.message,
});
factory SignupResponse.fromJson(Map<String, dynamic> json) {
return SignupResponse(
status: json['status'],
message: json['message'],
);
}
}
Future<SignupResponse> signUp(context, String username, String password, String confirmPassword) async {
var keyPair = CryptoUtils.generateRSAKeyPair();
var rsaPubPem = CryptoUtils.encodeRSAPublicKeyToPem(keyPair.publicKey);
var rsaPrivPem = CryptoUtils.encodeRSAPrivateKeyToPem(keyPair.privateKey);
var encRsaPriv = AesHelper.aesEncrypt(password, Uint8List.fromList(rsaPrivPem.codeUnits));
// TODO: Check for timeout here
final resp = await http.post(
Uri.parse('http://192.168.1.5:8080/api/v1/signup'),
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(<String, String>{
'username': username,
'password': password,
'confirm_password': confirmPassword,
'asymmetric_public_key': rsaPubPem,
'asymmetric_private_key': encRsaPriv,
}),
);
SignupResponse response = SignupResponse.fromJson(jsonDecode(resp.body));
if (resp.statusCode != 201) {
throw Exception(response.message);
}
return response;
}
class Signup extends StatelessWidget {
const Signup({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
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)
}
),
backgroundColor: Colors.transparent,
shadowColor: Colors.transparent,
),
body: const SafeArea(
child: SignupWidget(),
)
);
}
}
class SignupWidget extends StatefulWidget {
const SignupWidget({Key? key}) : super(key: key);
@override
State<SignupWidget> createState() => _SignupWidgetState();
}
class _SignupWidgetState extends State<SignupWidget> {
final _formKey = GlobalKey<FormState>();
TextEditingController usernameController = TextEditingController();
TextEditingController passwordController = TextEditingController();
TextEditingController passwordConfirmController = TextEditingController();
@override
Widget build(BuildContext context) {
const TextStyle inputTextStyle = TextStyle(
fontSize: 18,
);
final OutlineInputBorder inputBorderStyle = OutlineInputBorder(
borderRadius: BorderRadius.circular(5),
borderSide: const BorderSide(
color: Colors.transparent,
)
);
final ButtonStyle buttonStyle = ElevatedButton.styleFrom(
primary: Theme.of(context).colorScheme.surface,
onPrimary: Theme.of(context).colorScheme.onSurface,
minimumSize: const Size.fromHeight(50),
padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),
textStyle: TextStyle(
fontSize: 20,
fontWeight: FontWeight.bold,
color: Theme.of(context).colorScheme.error,
),
);
return Center(
child: Form(
key: _formKey,
child: Center(
child: Padding(
padding: const EdgeInsets.only(
left: 20,
right: 20,
top: 0,
bottom: 100,
),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Text(
'Sign Up',
style: TextStyle(
fontSize: 35,
color: Theme.of(context).colorScheme.onBackground,
),
),
const SizedBox(height: 30),
TextFormField(
controller: usernameController,
decoration: InputDecoration(
hintText: 'Username',
enabledBorder: inputBorderStyle,
focusedBorder: inputBorderStyle,
),
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: 10),
TextFormField(
controller: passwordController,
obscureText: true,
enableSuggestions: false,
autocorrect: false,
decoration: InputDecoration(
hintText: 'Password',
enabledBorder: inputBorderStyle,
focusedBorder: inputBorderStyle,
),
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: 10),
TextFormField(
controller: passwordConfirmController,
obscureText: true,
enableSuggestions: false,
autocorrect: false,
decoration: InputDecoration(
hintText: 'Password',
enabledBorder: inputBorderStyle,
focusedBorder: inputBorderStyle,
),
style: inputTextStyle,
// The validator receives the text that the user has entered.
validator: (value) {
if (value == null || value.isEmpty) {
return 'Confirm your password';
}
if (value != passwordController.text) {
return 'Passwords do not match';
}
return null;
},
),
const SizedBox(height: 15),
ElevatedButton(
style: buttonStyle,
onPressed: () {
if (_formKey.currentState!.validate()) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('Processing Data')),
);
signUp(
context,
usernameController.text,
passwordController.text,
passwordConfirmController.text
).then((value) {
Navigator.of(context).popUntil((route) => route.isFirst);
}).catchError((error) {
print(error); // TODO: Show error on interface
});
}
},
child: const Text('Submit'),
),
],
)
)
)
)
);
}
}