Ability to pass protocol regex

Author: Nik Karbaum

src/Saml2/Utils.php

@@ -51,6 +51,11 @@ class Utils
      */
     private static $_protocol;
 
+    /**
+     * @var string
+     */
+    private static $_protocolRegex = '@^https?://@i';
+
     /**
      * @var int|null
      */
@@ -285,8 +290,11 @@ public static function redirect($url, array $parameters = array(), $stay = false
             $url = self::getSelfURLhost() . $url;
         }
 
-        /* Verify that the URL is to a http or https site. */
-        $wrongProtocol = !preg_match('@^https?://@i', $url);
+        /**
+         * Verify that the URL matches the regex for the protocol.
+         * By default this will check for http and https
+         */
+        $wrongProtocol = !preg_match(self::$_protocolRegex, $url);
         $url = filter_var($url, FILTER_VALIDATE_URL);
         if ($wrongProtocol || empty($url)) {
             throw new Error(
@@ -333,6 +341,16 @@ public static function redirect($url, array $parameters = array(), $stay = false
         exit();
     }
 
+     /**
+     * @var $protocolRegex string
+     */
+    public static function setProtocolRegex($protocolRegex)
+    {
+        if (!empty($protocolRegex)) {
+            self::$_protocolRegex = $protocolRegex;
+        }
+    }
+
     /**
      * Set the Base URL value.
      *