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Added some buttons on the "secret data" page RELOAD and DELETE #1

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Added some buttons on the "secret data" page RELOAD and DELETE #1

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263 changes: 134 additions & 129 deletions lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -3,17 +3,17 @@ import 'package:http/http.dart' as http;
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'dart:convert' show json, base64, ascii;

const SERVER_IP = 'http://192.168.1.167:5000';
const SERVER_IP = 'http://27706f93.ngrok.io';
final storage = FlutterSecureStorage();

void main() {
void main() {
runApp(MyApp());
}

class MyApp extends StatelessWidget {
Future<String> get jwtOrEmpty async {
var jwt = await storage.read(key: "jwt");
if(jwt == null) return "";
if (jwt == null) return "";
return jwt;
}

Expand All @@ -25,28 +25,29 @@ class MyApp extends StatelessWidget {
primarySwatch: Colors.blue,
),
home: FutureBuilder(
future: jwtOrEmpty,
builder: (context, snapshot) {
if(!snapshot.hasData) return CircularProgressIndicator();
if(snapshot.data != "") {
var str = snapshot.data;
var jwt = str.split(".");
future: jwtOrEmpty,
builder: (context, snapshot) {
if (!snapshot.hasData) return CircularProgressIndicator();
if (snapshot.data != "") {
var str = snapshot.data;
var jwt = str.split(".");

if(jwt.length !=3) {
return LoginPage();
} else {
var payload = json.decode(ascii.decode(base64.decode(base64.normalize(jwt[1]))));
if(DateTime.fromMillisecondsSinceEpoch(payload["exp"]*1000).isAfter(DateTime.now())) {
return HomePage(str, payload);
} else {
if (jwt.length != 3) {
return LoginPage();
} else {
var payload = json.decode(
ascii.decode(base64.decode(base64.normalize(jwt[1]))));
if (DateTime.fromMillisecondsSinceEpoch(payload["exp"] * 1000)
.isAfter(DateTime.now())) {
return HomePage(str, payload);
} else {
return LoginPage();
}
}
} else {
return LoginPage();
}
} else {
return LoginPage();
}
}
),
}),
);
}
}
Expand All @@ -56,139 +57,143 @@ class LoginPage extends StatelessWidget {
final TextEditingController _passwordController = TextEditingController();

void displayDialog(context, title, text) => showDialog(
context: context,
builder: (context) =>
AlertDialog(
title: Text(title),
content: Text(text)
),
);
context: context,
builder: (context) =>
AlertDialog(title: Text(title), content: Text(text)),
);

Future<String> attemptLogIn(String username, String password) async {
var res = await http.post(
"$SERVER_IP/login",
body: {
"username": username,
"password": password
}
);
if(res.statusCode == 200) return res.body;
var res = await http.post("$SERVER_IP/login",
body: {"username": username, "password": password});
if (res.statusCode == 200) return res.body;
return null;
}

Future<int> attemptSignUp(String username, String password) async {
var res = await http.post(
'$SERVER_IP/signup',
body: {
"username": username,
"password": password
}
);
var res = await http.post('$SERVER_IP/signup',
body: {"username": username, "password": password});
return res.statusCode;

}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("Log In"),),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: <Widget>[
TextField(
controller: _usernameController,
decoration: InputDecoration(
labelText: 'Username'
appBar: AppBar(
title: Text("Log In"),
),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: <Widget>[
TextField(
controller: _usernameController,
decoration: InputDecoration(labelText: 'Username'),
),
),
TextField(
controller: _passwordController,
obscureText: true,
decoration: InputDecoration(
labelText: 'Password'
TextField(
controller: _passwordController,
obscureText: true,
decoration: InputDecoration(labelText: 'Password'),
),
),
FlatButton(
onPressed: () async {
var username = _usernameController.text;
var password = _passwordController.text;
var jwt = await attemptLogIn(username, password);
if(jwt != null) {
storage.write(key: "jwt", value: jwt);
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => HomePage.fromBase64(jwt)
)
);
} else {
displayDialog(context, "An Error Occurred", "No account was found matching that username and password");
}
},
child: Text("Log In")
),
FlatButton(
onPressed: () async {
var username = _usernameController.text;
var password = _passwordController.text;
FlatButton(
onPressed: () async {
var username = _usernameController.text;
var password = _passwordController.text;
var jwt = await attemptLogIn(username, password);
if (jwt != null) {
storage.write(key: "jwt", value: jwt);
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => HomePage.fromBase64(jwt)));
} else {
displayDialog(context, "An Error Occurred",
"No account was found matching that username and password");
}
},
child: Text("Log In")),
FlatButton(
onPressed: () async {
var username = _usernameController.text;
var password = _passwordController.text;

if(username.length < 4)
displayDialog(context, "Invalid Username", "The username should be at least 4 characters long");
else if(password.length < 4)
displayDialog(context, "Invalid Password", "The password should be at least 4 characters long");
else{
var res = await attemptSignUp(username, password);
if(res == 201)
displayDialog(context, "Success", "The user was created. Log in now.");
else if(res == 409)
displayDialog(context, "That username is already registered", "Please try to sign up using another username or log in if you already have an account.");
else {
displayDialog(context, "Error", "An unknown error occurred.");
}
}
},
child: Text("Sign Up")
)
],
),
)
);
if (username.length < 4)
displayDialog(context, "Invalid Username",
"The username should be at least 4 characters long");
else if (password.length < 4)
displayDialog(context, "Invalid Password",
"The password should be at least 4 characters long");
else {
var res = await attemptSignUp(username, password);
if (res == 201)
displayDialog(context, "Success",
"The user was created. Log in now.");
else if (res == 409)
displayDialog(
context,
"That username is already registered",
"Please try to sign up using another username or log in if you already have an account.");
else {
displayDialog(
context, "Error", "An unknown error occurred.");
}
}
},
child: Text("Sign Up"))
],
),
));
}
}

class HomePage extends StatelessWidget {
HomePage(this.jwt, this.payload);

factory HomePage.fromBase64(String jwt) =>
HomePage(

factory HomePage.fromBase64(String jwt) => HomePage(
jwt,
json.decode(
ascii.decode(
base64.decode(base64.normalize(jwt.split(".")[1]))
)
)
);
ascii.decode(base64.decode(base64.normalize(jwt.split(".")[1])))));

final String jwt;
final Map<String, dynamic> payload;

@override
Widget build(BuildContext context) =>
Scaffold(
appBar: AppBar(title: Text("Secret Data Screen")),
body: Center(
child: FutureBuilder(
future: http.read('$SERVER_IP/data', headers: {"Authorization": jwt}),
builder: (context, snapshot) =>
snapshot.hasData ?
Column(children: <Widget>[
Text("${payload['username']}, here's the data:"),
Text(snapshot.data, style: Theme.of(context).textTheme.display1)
],)
:
snapshot.hasError ? Text("An error occurred") : CircularProgressIndicator()
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(title: Text("Secret Data Screen")),
body: Center(
child: FutureBuilder(
future:
http.read('$SERVER_IP/data', headers: {"Authorization": jwt}),
builder: (context, snapshot) => snapshot.hasData
? Column(
children: <Widget>[
Text("${payload['username']}, here's the data:"),
Text(snapshot.data,
style: Theme.of(context).textTheme.display1),
RaisedButton(
child: Text('Reload'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
HomePage.fromBase64(jwt)));
},
),
RaisedButton(
child: Text('Delete Key and BackToLogin'),
onPressed: () async {
await storage.deleteAll();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => LoginPage()));
},
),
],
)
: snapshot.hasError
? Text("An error occurred")
: CircularProgressIndicator()),
),
),
);
}
);
}