<?php
/**
 * Copyright 2015 Openstack Foundation
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

/**
 * Class ETagChecker
 */
class ETagChecker {
    /**
     * @param $route
     * @param $request
     * @param $response
     */
    public function filter($route, $request, $response)
    {
        if($response->getStatusCode()!= 200) return;
        $etag = md5($response->getContent());
        $requestETag = str_replace('"', '', $request->getETags());

        if($requestETag && $requestETag[0] == $etag){
            $response->setNotModified();
        }

        $response->setEtag($etag);
    }
}