Replaced check with hardwired path

src/Model/Photo.php

@@ -710,6 +710,18 @@ class Photo
 		return $image_uri;
 	}
 
+	/**
+	 * Checks if the given URL is a local photo.
+	 * Since it is meant for time critical occasions, the check is done without any database requests.
+	 *
+	 * @param string $url
+	 * @return boolean
+	 */
+	public static function isPhotoURI(string $url): bool
+	{
+		return !empty(self::ridFromURI($url));
+	}
+
 	/**
 	 * Changes photo permissions that had been embedded in a post
 	 *