Merge pull request #54 from tomvo/master

Simple JSONP Middleware class

Author: silentworks

Middleware/Jsonp.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * JSONP Middleware Class for the Slim Framework
+ *
+ * @author  Tom van Oorschot <[email protected]>
+ * @since  17-12-2012
+ *
+ * Simple class to wrap the response of the application in a JSONP callback function.
+ * The class is triggered when a get parameter of callback is found   
+ *
+ * Usage
+ * ====
+ * 
+ * $app = new \Slim\Slim();
+ * $app->add(new \Slim\Extras\Middleware\JSONPMiddleware());
+ * 
+ */
+
+namespace Slim\Extras\Middleware;
+
+class JSONPMiddleware extends \Slim\Middleware
+{
+    public function call()
+    {
+        $callback = $this->app->request()->get('callback');
+
+        //Fetch the body first
+        $this->next->call();
+
+        //If the JSONP callback parameter is set then wrap the response body in the original
+        //callback string.
+        if(!empty($callback)){
+            //The response becomes a javascript response
+            $this->app->contentType('application/javascript');
+
+            $jsonp_response = htmlspecialchars($callback) . "(" .$this->app->response()->body() . ")";
+            $this->app->response()->body($jsonp_response);
+        }
+    }
+}