129 lines
3.9 KiB
Dart
129 lines
3.9 KiB
Dart
import 'package:frosty/api/twitch_api.dart';
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import 'package:mobx/mobx.dart';
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import 'package:flutter/foundation.dart';
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import 'package:frosty/constants.dart';
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import 'package:frosty/models/user.dart';
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import 'package:flutter_secure_storage/flutter_secure_storage.dart';
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import 'package:flutter_web_auth/flutter_web_auth.dart';
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part 'auth_store.g.dart';
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class AuthStore = _AuthBase with _$AuthStore;
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abstract class _AuthBase with Store {
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/// Secure storage to store tokens.
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final _storage = const FlutterSecureStorage();
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/// The current token.
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@observable
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String? _token;
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String? get token => _token;
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/// Whether the user is logged in or not.
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@observable
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var _isLoggedIn = false;
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bool get isLoggedIn => _isLoggedIn;
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/// Whether the token is valid or not.
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@observable
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var _tokenIsValid = false;
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/// The current user's info.
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@observable
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UserTwitch? _user;
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UserTwitch? get user => _user;
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/// Authentication headers for Twitch API requests.
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@computed
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Map<String, String> get headersTwitch => {'Authorization': 'Bearer $_token', 'Client-Id': clientId};
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/// Initialize by retrieving a token if it does not already exist.
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@action
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Future<void> init() async {
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// Read and set the currently stored user token, if any.
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_token = await _storage.read(key: 'USER_TOKEN');
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// If the token does not exist, get the default token.
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// Otherwise, log in and get the user info.
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if (_token == null) {
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// Retrieve the currently stored default token if it exists.
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_token = await _storage.read(key: 'DEFAULT_TOKEN');
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// If the token does not exist, get a new token and store it.
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if (_token == null) {
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_token = await Twitch.getDefaultToken();
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await _storage.write(key: 'DEFAULT_TOKEN', value: _token);
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}
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} else {
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_user = await Twitch.getUserInfo(headers: headersTwitch);
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_isLoggedIn = true;
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}
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// Validate the token.
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_tokenIsValid = await Twitch.validateToken(token: _token!);
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// If the token is invalid, logout.
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if (!_tokenIsValid) {
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logout();
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return;
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}
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debugPrint('Token is valid: $_tokenIsValid');
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debugPrint('Created auth provider');
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}
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/// Initiates the OAuth sign-in process and updates fields accordingly upon successful login.
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@action
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Future<void> login() async {
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// Create the OAuth sign-in URI.
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final loginUrl = Uri(
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scheme: 'https',
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host: 'id.twitch.tv',
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path: '/oauth2/authorize',
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queryParameters: {
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'client_id': clientId,
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'redirect_uri': 'auth://',
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'response_type': 'token',
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'scope': 'chat:read chat:edit user:read:follows',
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},
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);
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try {
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// Retrieve the OAuth redirect URI.
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final result = await FlutterWebAuth.authenticate(url: loginUrl.toString(), callbackUrlScheme: 'auth', preferEphemeral: true);
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// Parse the user token from the redirect URI fragment.
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final fragment = Uri.parse(result).fragment;
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_token = fragment.substring(fragment.indexOf('=') + 1, fragment.indexOf('&'));
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// Store the user token.
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await _storage.write(key: 'USER_TOKEN', value: _token);
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// Retrieve the user info and set it
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_user = await Twitch.getUserInfo(headers: headersTwitch);
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// Set the login status to logged in.
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_isLoggedIn = true;
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} catch (error) {
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debugPrint('Login failed due to $error');
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}
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}
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/// Logs out the current user and updates fields accordingly.
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@action
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Future<void> logout() async {
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// Delete the existing user token.
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await _storage.delete(key: 'USER_TOKEN');
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_token = null;
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// Clear the user info.
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_user = null;
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// Set the login status to logged out.
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_isLoggedIn = false;
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// If the default token already exists, set it. Otherwise, get a new default token.
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_token = await _storage.read(key: 'DEFAULT_TOKEN') ?? await Twitch.getDefaultToken();
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debugPrint('Successfully logged out');
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}
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}
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