From bfcf7af4d85e6cd7becdeafa341e5b59b4798897 Mon Sep 17 00:00:00 2001
From: Alex Bilbie <alexbilbie@Alexs-Home-iMac.local>
Date: Fri, 12 Feb 2016 09:02:17 +0000
Subject: [PATCH] Added getQueryStringParameter method

---
 src/Grant/AbstractGrant.php | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/Grant/AbstractGrant.php b/src/Grant/AbstractGrant.php
index 42c1644e..bf526b8c 100644
--- a/src/Grant/AbstractGrant.php
+++ b/src/Grant/AbstractGrant.php
@@ -239,6 +239,20 @@ abstract class AbstractGrant implements GrantTypeInterface
         return (isset($request->getParsedBody()[$parameter])) ? $request->getParsedBody()[$parameter] : $default;
     }
 
+    /**
+     * Retrieve query string parameter.
+     *
+     * @param string                                   $parameter
+     * @param \Psr\Http\Message\ServerRequestInterface $request
+     * @param mixed                                    $default
+     *
+     * @return null|string
+     */
+    protected function getQueryStringParameter($parameter, ServerRequestInterface $request, $default = null)
+    {
+        return (isset($request->getQueryParams()[$parameter])) ? $request->getQueryParams()[$parameter] : $default;
+    }
+
     /**
      * Retrieve server parameter.
      *