fix(external-services): argument error

.github/workflows/push.yml

@@ -63,6 +63,7 @@ jobs:
                     - { name: "AuditEventTypesTest", filter: "--filter AuditEventTypesTest" }
                     - { name: "GuzzleTracingTest", filter: "--filter GuzzleTracingTest" }
                     - { name: "Repositories", filter: "--filter tests/Repositories/" }
+                    - { name: "Services", filter: "--filter tests/Unit/Services/" }
         env:
             OTEL_SERVICE_ENABLED: false
             APP_ENV: testing

app/Services/Apis/AbstractOAuth2Api.php

@@ -132,8 +132,8 @@ protected function getAccessToken():?string{
                 Log::debug("AbstractOAuth2Api::getAccessToken - access token is empty, getting new one");
                 $client    = $this->getIDPClient();
                 $appConfig = $this->getAppConfig();
-                $scopes    = $appConfig['scopes'] ?? [];
-                Log::debug(sprintf( "AbstractOAuth2Api::getAccessToken - got scopes %s", implode(' ', $scopes)));
+                $scopes    = $appConfig['scopes'] ?? '';
+                Log::debug(sprintf( "AbstractOAuth2Api::getAccessToken - got scopes %s", $scopes));
                 // Try to get an access token using the client credentials grant.
                 $accessToken = $client->getAccessToken('client_credentials', ['scope' => $scopes]);
                 $token = $accessToken->getToken();
@@ -163,4 +163,4 @@ protected function getAccessToken():?string{
     protected function cleanAccessToken():void{
         $this->cacheService->delete($this->getAccessTokenCacheKey());
     }
-}
+}

tests/Unit/Services/AbstractOAuth2ApiScopesTest.php

@@ -0,0 +1,85 @@
+<?php namespace Tests\Unit\Services;
+/**
+ * Copyright 2026 OpenStack Foundation
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+use App\Services\Apis\MailApi;
+use Illuminate\Support\Facades\Config;
+use libs\utils\ICacheService;
+use Mockery;
+use Tests\TestCase;
+
+/**
+ * Class AbstractOAuth2ApiScopesTest
+ * Regression test for implode() TypeError when scopes config is a string.
+ * @see https://github.com/OpenStackweb/summit-api/issues/XXX
+ * @package Tests\Unit\Services
+ */
+class AbstractOAuth2ApiScopesTest extends TestCase
+{
+    protected function tearDown(): void
+    {
+        Mockery::close();
+        parent::tearDown();
+    }
+
+    /**
+     * Regression test: getAccessToken() must not throw TypeError when
+     * scopes is a string from env(). Previously, implode(' ', $scopes)
+     * crashed because $scopes was a string, not an array.
+     *
+     * @dataProvider scopesProvider
+     */
+    public function testGetAccessTokenHandlesVariousScopesTypes($scopeValue, string $description)
+    {
+        Config::set('idp.authorization_endpoint', 'https://idp.test/authorize');
+        Config::set('idp.token_endpoint', 'https://idp.test/token');
+        Config::set('mail.service_base_url', 'https://mail.test');
+        Config::set('mail.service_client_id', 'test-client');
+        Config::set('mail.service_client_secret', 'test-secret');
+        Config::set('mail.service_client_scopes', $scopeValue);
+        Config::set('curl.timeout', 1);
+        Config::set('curl.allow_redirects', false);
+        Config::set('curl.verify_ssl_cert', true);
+
+        $cacheService = Mockery::mock(ICacheService::class);
+        $cacheService->shouldReceive('getSingleValue')->andReturn(null);
+
+        $api = new MailApi($cacheService);
+
+        $reflection = new \ReflectionMethod($api, 'getAccessToken');
+        $reflection->setAccessible(true);
+
+        try {
+            $reflection->invoke($api);
+        } catch (\TypeError $e) {
+            $this->fail("TypeError thrown with {$description}: " . $e->getMessage());
+        } catch (\Exception $e) {
+            // Connection/HTTP errors are expected since IDP is not reachable.
+            // The critical assertion is that no TypeError was thrown from implode().
+            $this->assertNotInstanceOf(
+                \TypeError::class,
+                $e,
+                "No TypeError should occur with {$description}"
+            );
+        }
+    }
+
+    public static function scopesProvider(): array
+    {
+        return [
+            'string scopes (space-separated)' => ['scope1 scope2', 'space-separated string scopes'],
+            'single string scope'             => ['payment-profile/read', 'single string scope'],
+            'null scopes'                     => [null, 'null scopes'],
+            'empty string scopes'             => ['', 'empty string scopes'],
+        ];
+    }
+}