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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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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;
}