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gyro/core/controller/base/cachemanager/headermanager/base.cacheheader.php

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<?php
/**
 * This cache header manager implements the basics of client side caching
 */
class BaseCacheHeaderManager implements ICacheHeaderManager {
        /**
         * Send cache headers
         * 
         * @param string $content
         * @param timestamp $expirationdate
         * @param timestamp $lastmodifieddate
         */
        public function send_headers(&$content, $expirationdate, $lastmodifieddate)     {
                // POST, DELETE etc should not be cached
                if (!in_array(RequestInfo::current()->method(), array('GET', 'HEAD'))) {
                        return;
                }
                
                $etag = md5($content);
                
                // Send 304, if applicable
                Common::check_if_none_match($etag);
                Common::check_not_modified($lastmodifieddate); // exits if not modified
                
                
                GyroHeaders::set('Pragma', '', true);
                $max_age = $expirationdate - time();
                GyroHeaders::set('Cache-Control', $this->get_cache_control($expirationdate, $max_age), true);
                GyroHeaders::set('Last-Modified', $lastmodifieddate ? GyroDate::http_date($lastmodifieddate) : '', false);
                GyroHeaders::set('Expires', $expirationdate ? GyroDate::http_date($expirationdate) : '', false);
                GyroHeaders::set('Etag', $etag, true);                  
                if (Config::has_feature(Config::TESTMODE)) {
                        GyroHeaders::set('X-Gyro-CacheHeader-Class', get_class($this), true);
                }
        }
        
        protected function check_304($etag) {
                
        }
        
        /**
         * Returns cache control header's content
         * 
         * @param timestamp $expirationdate
         * @param int $max_age Expiratin date minus current timestamp, already preprocessed
         */
        protected function get_cache_control($expirationdate, $max_age) {
                return 'no-cache,no-store';
        }
}

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