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feat: implement client credentials grant handling

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This commit is contained in:
Udhay-Adithya
2025-07-20 23:48:35 +05:30
parent fd4b05663c
commit 1089403467
3 changed files with 67 additions and 4 deletions
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17
packages/better_networking/lib/utils/auth/handle_auth.dart
View File

@@ -202,8 +202,21 @@ Future<HttpRequestModel> handleAuth(
break;
case OAuth2GrantType.clientCredentials:
// TODO: Handle this case.
throw UnimplementedError();
final client = await oAuth2ClientCredentialsHandler(
oauth2Model: oauth2,
credentialsFile: credentialsFile,
);
debugPrint(client.credentials.accessToken);
// Add the access token to the request headers
updatedHeaders.add(
NameValueModel(
name: 'Authorization',
value: 'Bearer ${client.credentials.accessToken}',
),
);
updatedHeaderEnabledList.add(true);
break;
case OAuth2GrantType.resourceOwnerPassword:
// TODO: Handle this case.
throw UnimplementedError();

52
packages/better_networking/lib/utils/auth/oauth2_utils.dart
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@@ -4,6 +4,8 @@ import 'dart:io';
import 'package:flutter_web_auth_2/flutter_web_auth_2.dart';
import 'package:oauth2/oauth2.dart' as oauth2;
import '../../models/models.dart';
Future<oauth2.Client> oAuth2AuthorizationCodeGrantHandler({
required String identifier,
required String secret,
@@ -73,3 +75,53 @@ Future<oauth2.Client> oAuth2AuthorizationCodeGrantHandler({
rethrow;
}
}
Future<oauth2.Client> oAuth2ClientCredentialsHandler({
required AuthOAuth2Model oauth2Model,
required File credentialsFile,
}) async {
// Try to use saved credentials
if (await credentialsFile.exists()) {
try {
final json = await credentialsFile.readAsString();
final credentials = oauth2.Credentials.fromJson(json);
if (credentials.accessToken.isNotEmpty && !credentials.isExpired) {
log('Using existing valid credentials');
// TODO: This adds the client_id parameter to the body instead of the header
return oauth2.clientCredentialsGrant(
Uri.parse(oauth2Model.authorizationUrl),
oauth2Model.clientId,
oauth2Model.clientSecret,
scopes: oauth2Model.scope != null ? [oauth2Model.scope!] : null,
);
}
} catch (e) {
log('Error reading existing credentials: $e');
}
}
log("Creating Client with id: ${oauth2Model.clientId}");
log("Creating Client with sec: ${oauth2Model.clientSecret}");
// Otherwise, perform the client credentials grant
final client = await oauth2.clientCredentialsGrant(
Uri.parse(oauth2Model.authorizationUrl),
oauth2Model.clientId,
oauth2Model.clientSecret,
scopes: oauth2Model.scope != null ? [oauth2Model.scope!] : null,
);
log("Created Client with id: ${client.identifier}");
log("Created Client with sec: ${client.secret}");
log("Created Client with sec: ${client.credentials.toJson()}");
log('Successfully authenticated via client credentials grant');
try {
await credentialsFile.writeAsString(client.credentials.toJson());
log('Saved credentials to file');
} catch (e) {
log('Failed to save credentials: $e');
}
return client;
}

2
packages/better_networking/lib/utils/utils.dart
View File

@@ -5,5 +5,3 @@ export 'http_response_utils.dart';
export 'string_utils.dart' hide RandomStringGenerator;
export 'uri_utils.dart';
export 'auth/handle_auth.dart';
export 'auth/oauth2_webview_utils.dart';
export 'auth/handle_auth_webview.dart';