簡易版 Nginx Cache Purge スクリプト

nginx_cache_purge.php

<?php
if ( isset($_GET['url']) ) {
        $url = stripslashes($_GET['url']);
        NginxCachePurge::purge($url);
}

Class NginxCachePurge {
        const CACHE_LEVELS = '1:2';
        const CACHE_DIR = '/var/cache/nginx/proxy_cache';

        public static function purge($url) {
                $cache_key = self::get_cache_key($url);
                $cache = self::get_cache_file($cache_key);
                if ( file_exists($cache) && @unlink($cache) ) {
                        printf('Success purge : %s (%s)', $url, $cache_key) . "\n";
                } else {
                        printf('Failure purge : %s (%s)', $url, $cache_key) . "\n";
                }
        }

        private static function get_cache_key($url) {
                return md5($url);
        }

        private static function get_cache_file($key) {
                $levels = preg_split("/:/", self::CACHE_LEVELS);
                $path = array();
                $path[] = self::CACHE_DIR;
                $offset = 0;
                foreach ($levels as $l) {
                        $offset = $offset + $l;
                        $path[] = substr($key, 0-$offset, $l);
                }
                $path[] = $key;
                return join("/", $path);
        }
}