CIL-410 - Allow redirect URL parameter for ShibError.

src/Service/ShibError.php

@@ -72,9 +72,12 @@ class ShibError
      * passed as parameters to the 'redirectErrors' handler URL, i.e.
      * in the $_GET global variable.
      *
+     * @param string|null $redirectUrl In case of Shibboleth error, redirect
+     *        to this URL. If null, then print out error to user.
+     *
      * @return ShibError A new ShibError object.
      */
-    public function __construct()
+    public function __construct($redirectUrl = null)
     {
         $this->errorarray = array();
         foreach (static::$errorparams as $param) {
@@ -98,6 +101,8 @@ public function __construct()
                     $responseurl,
                     false
                 );
+            } elseif (!is_null($redirectUrl)) {
+                header('Location: ' . $redirectUrl);
             } else {
                 $this->printError();
             }