Flutter Guides

1. Set Up Flutter Development Environment

Follow the instructions on the official Flutter documentation to set up your Flutter development environment. If you already have Flutter set up, you can skip this step.

Download the Git Repository

If you want to use the sample project, download the Git repository with the following command: Download the Furo Flutter Sample project.

git clone https://github.com/lukasjhan/furo-sample-flutter

If you want to create your project from scratch, follow the guide below.

Install and Use the web_auth Library

In this guide, we will use the flutter_web_auth library. Please refer to the link for information about the library.

Installation

Add the library to the dependencies section in the pubspec.yaml file. Here’s an example:

dependencies:
  flutter:
    sdk: flutter

  flutter_web_auth: ^0.5.0
  http: ^0.13.6
  flutter_dotenv: ^5.0.2

assets: lib/.env # path to your .env

Usage

import 'package:flutter_web_auth/flutter_web_auth.dart';

final result = await FlutterWebAuth.authenticate(
        url: loginUrl,
        callbackUrlScheme: scheme
);

final code = Uri.parse(result).queryParameters['code'];
print(code);

Parameter Name	Description	Type
url	URL of the login page	string
callbackUrlScheme	URI scheme (deep link) to receive the callback after authentication: web: http/https, mobile: [e.g., youtube://]	string

The “callbackUrlScheme” must be a valid scheme string. A valid RFC 3986 URL scheme should start with a letter and consist of letters, numbers, plus sign (”+”), period (”.”) or hyphen (”-”).

Sample code

lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_web_auth/flutter_web_auth.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:flutter_dotenv/flutter_dotenv.dart';

void main() {
  await dotenv.load(fileName: ".env");
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  String _counter = 'Hello Furo!';
  final String _defaultMsg = 'Set Up Your Client ID';

  Future<void> _login() async {

    const clientId = dotenv.env['CLIENT_ID'] || 'Set Up Your Client ID';
    if (clientId == _defaultMsg) {
      setState(() {
        _counter = _defaultMsg;
      });
      return;
    }

    const mode = 'web'; // web or mobile
    const port = '45453';
    const redirectUri = mode == 'web'
        ? 'http://localhost:$port/auth.html'
        : 'login.test.furo://auth';
    const loginUrl =
        'https://auth.furo.one/login/$clientId?redirect_uri=$redirectUri';

    const scheme = mode == 'web' ? 'http' : 'login.test.furo';
    final result = await FlutterWebAuth.authenticate(
        url: loginUrl, callbackUrlScheme: scheme);
    print(result);
    final code = Uri.parse(result).queryParameters['code'];
    if (code == null) {
      return;
    }
    print(code);
    var response = await http.post(
      Uri.parse('https://api.furo.one/sessions/code/authenticate'),
      headers: <String, String>{
        'Content-Type': 'application/json',
      },
      body: jsonEncode(<String, String>{
        'code': code,
      }),
    );
    print(response.body);
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter = response.body;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'Click the button to login to Furo',
            ),
            Text(
              _counter,
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _login,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Copy .env value to .env file in project directory to lib/.env. Or, create a .env file and set the environment variables as follows. If you cannot use the .env file, enter the Client ID obtained from the console as clientId in the main.dart file.

CLIENT_ID="{{YOUR_CLIENT_ID}}"

Change the Default Callback URI in the console’s input box from the default value https://sample.furo.one/{{YOUR_CLIENT_ID}} to http://localhost:3000/{{YOUR_CLIENT_ID}}.

redirectUri and callbackUri

Web

Change the Default Callback URI in the console’s input box from the default value https://sample.furo.one/{{YOUR_CLIENT_ID}} to http://localhost:{port}/auth.html. Add an auth.html file under the web directory of your project.

<!DOCTYPE html>
<title>Authentication complete</title>
<p>
  Authentication is complete. If this does not happen automatically, please
  close the window.
  <script>
    console.log(window.location.href);
    window.opener.postMessage(
      {
        'flutter-web-auth': window.location.href,
      },
      window.location.origin
    );
    window close();
  </script>
</p>

After starting the project, click the login button to log in to Furo.

Android

Change the Default Callback URI in the console’s input box from the

SDK Documentation

Javascript/Typescript

Dart/Flutter

1. Set Up Flutter Development Environment

Download the Git Repository

Install and Use the web_auth Library

Sample code

Web

Android

SDK Documentation

Javascript/Typescript

Dart/Flutter

​1. Set Up Flutter Development Environment

​Download the Git Repository

​Install and Use the web_auth Library

​Sample code

​2. Integrate Furo Login

​Web

​Android

1. Set Up Flutter Development Environment

Download the Git Repository

Install and Use the web_auth Library

Sample code

2. Integrate Furo Login

Web

Android