check if user is logged in at the beginning of the code endpoint. if so, redirect to the redirect URL and do nothing

Signed-off-by: Julien Veyssier <julien-nc@posteo.net>

Author: julien-nc

lib/Controller/LoginController.php

@@ -358,6 +358,12 @@ public function login(int $providerId, ?string $redirectUrl = null) {
 	#[UseSession]
 	#[BruteForceProtection(action: 'userOidcCode')]
 	public function code(string $state = '', string $code = '', string $scope = '', string $error = '', string $error_description = '') {
+		if ($this->userSession->isLoggedIn()) {
+			$sessionKeySuffix = '-' . $state;
+			$redirectUrl = $this->session->get(self::REDIRECT_AFTER_LOGIN . $sessionKeySuffix);
+			$this->cleanupSessionState($sessionKeySuffix);
+			return $this->getRedirectResponse(!empty($redirectUrl) ? $redirectUrl : null);
+		}
 		if (!$this->isSecure()) {
 			return $this->buildProtocolErrorResponse();
 		}