aio-interface: preserve old PHPSESSID session during cookie migration to survive 502s on mastercontainer update (#7971)

php/src/Auth/AuthManager.php

@@ -42,6 +42,18 @@ readonly class AuthManager {
         $_SESSION[self::SESSION_KEY] = $isLoggedIn;
     }
 
+    /**
+     * Migrates the authenticated state from an old session (different cookie name) to the new session.
+     * Unlike SetAuthState, this method preserves the original login timestamp and does not update
+     * the session_date_file, so the session deduplicator is not triggered. This keeps the old session
+     * file alive in case the response carrying the new cookie is lost (e.g., due to a 502 error during
+     * a mastercontainer update), allowing the client to retry with the old cookie.
+     */
+    public function MigrateAuthState(int $oldTimestamp) : void {
+        $_SESSION[self::SESSION_KEY] = true;
+        $_SESSION['date_time'] = $oldTimestamp;
+    }
+
     public function IsAuthenticated() : bool {
         return isset($_SESSION[self::SESSION_KEY]) && $_SESSION[self::SESSION_KEY] === true;
     }