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Refactir auth provider

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Better encapsulation and access to tokens/headers.
This commit is contained in:
Tommy Chow 2021-09-06 18:59:33 -04:00
parent 555018e4d0
commit 2912971a02
1 changed files with 33 additions and 25 deletions
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58
lib/providers/authentication_provider.dart
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@ -9,42 +9,50 @@ import 'package:flutter_web_auth/flutter_web_auth.dart';
// TODO: Fix up notifyListeners() placements.
class AuthenticationProvider extends ChangeNotifier {
static String? _token;
static String? get token => _token;
static Map<String, String>? authHeaders;
final _storage = new FlutterSecureStorage();
final _secret = const String.fromEnvironment('SECRET');
final _clientId = const String.fromEnvironment('CLIENT_ID');
final _secret = secret;
final _clientId = clientId;
var isLoggedIn = false;
var tokenIsValid = false;
var _isLoggedIn = false;
bool get isLoggedIn => _isLoggedIn;
var _tokenIsValid = false;
String? token;
Map<String, String>? authHeaders;
UserTwitch? user;
/// Initialize by retrieving a token if it does not already exist.
Future<void> init() async {
// Read and set the currently stored user token, if any.
token = await _storage.read(key: 'USER_TOKEN');
_token = await _storage.read(key: 'USER_TOKEN');
// If the token does not exist, get the default token.
// Otherwise, log in and get the user info.
if (token != null) {
isLoggedIn = true;
_isLoggedIn = true;
authHeaders = {'Authorization': 'Bearer $token', 'Client-Id': _clientId};
await getUserInfo();
await _getUserInfo();
} else {
await getDefaultToken();
await _getDefaultToken();
}
// Set the auth headers for future requests and validate the token.
authHeaders = {'Authorization': 'Bearer $token', 'Client-Id': _clientId};
await validateToken();
await _validateToken();
debugPrint('Token is valid: $_tokenIsValid');
debugPrint('Created auth provider');
}
/// Returns a token for an anonymous user.
Future<void> getDefaultToken() async {
Future<void> _getDefaultToken() async {
debugPrint('Getting default token...');
token = await _storage.read(key: 'DEFAULT_TOKEN');
_token = await _storage.read(key: 'DEFAULT_TOKEN');
if (token != null) return;
@ -64,26 +72,26 @@ class AuthenticationProvider extends ChangeNotifier {
await _storage.write(key: 'DEFAULT_TOKEN', value: defaultToken);
token = defaultToken;
_token = defaultToken;
}
Future<void> validateToken() async {
Future<void> _validateToken() async {
debugPrint('Validating token...');
final response = await http.get(Uri.parse(twitchValidateUrl), headers: {'Authorization': 'Bearer $token'});
final response = await http.get(Uri.parse('https://id.twitch.tv/oauth2/validate'), headers: {'Authorization': 'Bearer $token'});
if (response.statusCode == 200) {
debugPrint('Token validated!');
tokenIsValid = true;
_tokenIsValid = true;
return;
}
debugPrint('Token invalidated :(');
tokenIsValid = false;
_tokenIsValid = false;
notifyListeners();
}
Future<void> getUserInfo() async {
final response = await http.get(Uri.parse(twitchUsersUrl), headers: authHeaders);
Future<void> _getUserInfo() async {
final response = await http.get(Uri.parse('https://api.twitch.tv/helix/users'), headers: authHeaders);
final userData = jsonDecode(response.body)['data'] as List;
user = UserTwitch.fromJson(userData.first);
@ -107,13 +115,13 @@ class AuthenticationProvider extends ChangeNotifier {
final fragment = Uri.parse(result).fragment;
token = fragment.substring(fragment.indexOf('=') + 1, fragment.indexOf('&'));
_token = fragment.substring(fragment.indexOf('=') + 1, fragment.indexOf('&'));
await _storage.write(key: 'USER_TOKEN', value: token);
isLoggedIn = true;
_isLoggedIn = true;
authHeaders = {'Authorization': 'Bearer $token', 'Client-Id': _clientId};
await getUserInfo();
await _getUserInfo();
notifyListeners();
} catch (error) {
@ -122,8 +130,8 @@ class AuthenticationProvider extends ChangeNotifier {
}
void logout() async {
await getDefaultToken();
isLoggedIn = false;
await _getDefaultToken();
_isLoggedIn = false;
await _storage.delete(key: 'USER_TOKEN');
debugPrint('Succesfully logged out');