added gzip compression to REST server responses

composer.json

@@ -17,7 +17,8 @@
         "ext-pdo": "*",
         "ext-readline": "*",
         "ext-mbstring": "*",
-        "ext-gd": "*"
+        "ext-gd": "*",
+        "ext-zlib": "*"
     },
     "autoload": {
         "psr-4": {

src/Pressmind/MVC/Request.php

@@ -249,6 +249,14 @@ public function getHeaders()
         return $this->_headers;
     }
 
+    /**
+     * @param $name
+     * @return string
+     */
+    public function getHeader($name) {
+        return isset($this->_headers[$name]) ? $this->_headers[$name] : null;
+    }
+
     /**
      * @return string
      */

src/Pressmind/MVC/Response.php

@@ -86,6 +86,10 @@ public function send()
         if($this->_content_type == 'application/json') {
             $this->_body = json_encode($this->_body);
         }
+        if(isset($this->_headers['Content-Encoding']) && in_array('gzip', array_map('trim', explode(',', $this->_headers['Content-Encoding'])))) {
+            $this->_body = gzencode(trim( preg_replace( '/\s+/', ' ', $this->_body )), 9);
+        }
+        header('Content-Length: '.strlen($this->_body));
         echo $this->_body;
     }
 }

src/Pressmind/REST/Server.php

@@ -117,6 +117,9 @@ public function handle() {
             $this->_response->addHeader('Access-Control-Allow-Methods', implode(',', array_merge($this->_output_methods, $this->_header_methods)));
             $this->_response->addHeader('Access-Control-Allow-Headers', 'Origin, Content-Type, X-Auth-Token, Authorization, Cache-Control, Pragma, Expires');
             $this->_response->addHeader('Cache-Control', 'no-cache');
+            if(in_array('gzip', array_map('trim', explode(',', $this->_request->getHeader('Accept-Encoding'))))) {
+                $this->_response->addHeader('Content-Encoding', 'gzip');
+            }
             if ($route_match = $this->_router->handle($this->_request)) {
                 $classname = $route_match['module'] . '\\' . $route_match['controller'];
                 if (class_exists($classname)) {