Encrypted messaging app
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import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import '/components/flash_message.dart';
import '/database/models/my_profile.dart';
import '/utils/storage/session_cookie.dart';
class LoginResponse {
final String userId;
final String username;
final String publicKey;
final String privateKey;
final String symmetricKey;
final String? imageLink;
const LoginResponse({
required this.publicKey,
required this.privateKey,
required this.symmetricKey,
required this.userId,
required this.username,
this.imageLink,
});
factory LoginResponse.fromJson(Map<String, dynamic> json) {
return LoginResponse(
userId: json['user_id'],
username: json['username'],
publicKey: json['asymmetric_public_key'],
privateKey: json['asymmetric_private_key'],
symmetricKey: json['symmetric_key'],
imageLink: json['image_link'],
);
}
}
class Login extends StatelessWidget {
const Login({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: null,
automaticallyImplyLeading: true,
leading: IconButton(icon: const Icon(Icons.arrow_back),
onPressed:() => {
Navigator.pop(context)
}
),
backgroundColor: Colors.transparent,
shadowColor: Colors.transparent,
),
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>();
final TextEditingController _usernameController = TextEditingController();
final TextEditingController _passwordController = TextEditingController();
final TextEditingController _urlController = TextEditingController();
bool _changedUrl = false;
String _initialServerUrl = '';
@override
void initState() {
MyProfile.getBaseServerUrl().then((String url) {
_urlController.text = url;
_initialServerUrl = url;
});
super.initState();
}
@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(
backgroundColor: Theme.of(context).colorScheme.tertiary,
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: 80,
),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Text(
'Login',
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 'Enter 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: 15),
changeUrl(),
const SizedBox(height: 20),
ElevatedButton(
style: buttonStyle,
onPressed: () {
if (_formKey.currentState!.validate()) {
login()
.then((val) {
Navigator.
pushNamedAndRemoveUntil(
context,
'/home',
ModalRoute.withName('/home'),
);
}).catchError((error) {
showMessage(
'Could not login to Envelope, please try again later.',
context,
);
});
}
},
child: const Text('Submit'),
),
],
)
)
)
)
);
}
Widget changeUrl() {
if (_changedUrl) {
return TextFormField(
controller: _urlController,
decoration: InputDecoration(
hintText: 'URL',
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(5),
borderSide: const BorderSide(
color: Colors.transparent,
)
),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(5),
borderSide: const BorderSide(
color: Colors.transparent,
)
),
),
style: const TextStyle(
fontSize: 18,
),
// The validator receives the text that the user has entered.
validator: (value) {
if (value == null || value.isEmpty) {
return 'Enter a URL';
}
return null;
},
);
}
return GestureDetector(
onTap: () {
setState(() {
_changedUrl = true;
});
},
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Text(
'Change URL',
style: TextStyle(
color: Theme.of(context).disabledColor,
),
),
const SizedBox(width: 10),
Icon(
Icons.edit,
color: Theme.of(context).disabledColor,
size: 14,
),
const SizedBox(width: 10),
],
)
);
}
Future<dynamic> login() async {
if (_urlController.text != _initialServerUrl) {
await MyProfile.setServerUrl(_urlController.text);
}
final resp = await http.post(
await MyProfile.getServerUrl('api/v1/login'),
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(<String, String>{
'username': _usernameController.text,
'password': _passwordController.text,
}),
);
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));
}
return await MyProfile.login(
json.decode(resp.body),
_passwordController.text,
);
}
}