Move OAuth module from API to common and solve PHPStan's errors

common/components/OAuth2/Repositories/EmptyScopeRepository.php

@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+namespace common\components\OAuth2\Repositories;
+
+use League\OAuth2\Server\Entities\ClientEntityInterface;
+use League\OAuth2\Server\Entities\ScopeEntityInterface;
+use League\OAuth2\Server\Repositories\ScopeRepositoryInterface;
+
+/**
+ * In our application we use separate scopes repositories for different grants.
+ * To create an instance of the authorization server, you need to pass the scopes
+ * repository. This class acts as a dummy to meet this requirement.
+ */
+final class EmptyScopeRepository implements ScopeRepositoryInterface {
+
+    public function getScopeEntityByIdentifier($identifier): ?ScopeEntityInterface {
+        return null;
+    }
+
+    public function finalizeScopes(
+        array $scopes,
+        string $grantType,
+        ClientEntityInterface $clientEntity,
+        ?string $userIdentifier = null,
+        ?string $authCodeId = null,
+    ): array {
+        return $scopes;
+    }
+
+}