Encrypted messaging app
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import 'dart:convert';
import 'dart:typed_data';
import 'package:Envelope/components/flash_message.dart';
import 'package:Envelope/models/my_profile.dart';
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 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 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'],
);
}
}
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>();
final TextEditingController _usernameController = TextEditingController();
final TextEditingController _passwordController = TextEditingController();
final TextEditingController _passwordConfirmController = TextEditingController();
final TextEditingController _serverUrlController = TextEditingController();
bool showUrlInput = false;
final OutlineInputBorder inputBorderStyle = OutlineInputBorder(
borderRadius: BorderRadius.circular(5),
borderSide: const BorderSide(
color: Colors.transparent,
)
);
final TextStyle inputTextStyle = const TextStyle(
fontSize: 18,
);
@override
Widget build(BuildContext context) {
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: SingleChildScrollView(
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),
input(
_usernameController,
'Username',
false,
(value) {
if (value == null || value.isEmpty) {
return 'Create a username';
}
return null;
},
),
const SizedBox(height: 10),
input(
_passwordController,
'Password',
true,
(value) {
if (value == null || value.isEmpty) {
return 'Enter a password';
}
return null;
},
),
const SizedBox(height: 10),
input(
_passwordConfirmController,
'Confirm Password',
true,
(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),
serverUrl(),
const SizedBox(height: 15),
ElevatedButton(
style: buttonStyle,
onPressed: () {
if (!_formKey.currentState!.validate()) {
return;
}
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('Processing Data')),
);
signUp()
.then((dynamic) {
Navigator.of(context).popUntil((route) => route.isFirst);
}).catchError((error) {
showMessage('Failed to signup to Envelope, please try again later', context);
});
},
child: const Text('Submit'),
),
],
)
)
)
)
)
);
}
Widget input(
TextEditingController textController,
String hintText,
bool password,
String? Function(dynamic) validationFunction,
) {
return TextFormField(
controller: textController,
obscureText: password,
enableSuggestions: false,
autocorrect: false,
decoration: InputDecoration(
hintText: hintText,
enabledBorder: inputBorderStyle,
focusedBorder: inputBorderStyle,
),
style: inputTextStyle,
validator: validationFunction,
);
}
Widget serverUrl() {
if (!showUrlInput) {
return
Padding(
padding: const EdgeInsets.only(top: 0, bottom: 10),
child: Row(
children: [
SizedBox(
height: 10,
child: IconButton(
onPressed: () {
setState(() {
showUrlInput = true;
});
},
icon: Icon(
Icons.edit,
color: Theme.of(context).disabledColor,
),
splashRadius: 2,
padding: const EdgeInsets.all(2),
iconSize: 15,
),
),
const SizedBox(width: 2),
Column(
children: [
const SizedBox(height: 10),
Text(
'Server URL - $defaultServerUrl',
style: TextStyle(
color: Theme.of(context).disabledColor,
fontSize: 12,
),
),
],
),
],
),
);
}
if (_serverUrlController.text == '') {
_serverUrlController.text = defaultServerUrl;
}
return input(
_serverUrlController,
'Server URL',
false,
(dynamic) {
return null;
},
);
}
Future<SignupResponse> signUp() async {
await MyProfile.setServerUrl(_serverUrlController.text);
var keyPair = CryptoUtils.generateRSAKeyPair();
var rsaPubPem = CryptoUtils.encodeRSAPublicKeyToPem(keyPair.publicKey);
var rsaPrivPem = CryptoUtils.encodeRSAPrivateKeyToPem(keyPair.privateKey);
String encRsaPriv = AesHelper.aesEncrypt(
_passwordController.text,
Uint8List.fromList(rsaPrivPem.codeUnits),
);
final resp = await http.post(
await MyProfile.getServerUrl('api/v1/signup'),
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(<String, String>{
'username': _usernameController.text,
'password': _passwordController.text,
'confirm_password': _passwordConfirmController.text,
'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;
}
}