<?php

/**
 * ECTouch Open Source Project
 * ============================================================================
 * Copyright (c) 2012-2014 http://ectouch.cn All rights reserved.
 * ----------------------------------------------------------------------------
 * 文件名称:EcHtmlCache.class.php
 * ----------------------------------------------------------------------------
 * 功能描述:静态缓存类
 * ----------------------------------------------------------------------------
 * Licensed ( http://www.ectouch.cn/docs/license.txt )
 * ----------------------------------------------------------------------------
 */

/* 访问控制 */
defined('IN_ECTOUCH') or die('Deny Access');

class EcHtmlCache
{
 private static $cacheFile = "";

 /**
 * 检查规则,看是否满足生成静态页面的条件
 * @param unknown $cachePath
 * @return string
 */
 public static function getCacheFile($cachePath)
 {
 if (isset($_SERVER['PATH_INFO'])) {
 $url = $_SERVER['PATH_INFO'];
 } else {
 $script_name = $_SERVER["SCRIPT_NAME"]; //获取当前文件的路径
 $url = $_SERVER["REQUEST_URI"]; //获取完整的路径,包含"?"之后的字符串
 //去除url包含的当前文件的路径信息
 if ($url && @strpos($url, $script_name, 0) !== false) {
 $url = substr($url, strlen($script_name));
 } else {
 $script_name = str_replace(basename($_SERVER["SCRIPT_NAME"]), '', $_SERVER["SCRIPT_NAME"]);
 if ($url && @strpos($url, $script_name, 0) !== false) {
 $url = substr($url, strlen($script_name));
 }
 }
 }
 //第一个字符是'/',则去掉
 if ($url[0] == '/') {
 $url = substr($url, 1);
 }

 if (empty($url)) { //首页
 $file = 'index.html';
 } elseif (empty($_SERVER['QUERY_STRING']) && preg_match("#^[a-z0-9_\-\/%]+\.(shtml|html|htm)$#i", $url)) { //静态页面
 $file = $url;
 } else { //静态缓存
 $url_md5 = md5($url);
 $file = $url_md5{0} . '/' . $url_md5{1} . '/' . $url_md5 . '.html';
 }
 $file = $cachePath . $file;
 $dir = dirname($file);
 if (!is_dir($dir)) {
 @mkdir($dir, 0777, true);
 }
 return $file;
 }

 /**
 * 读取静态缓存文件
 * @param string $cachePath
 * @param number $expire
 * @return number|boolean
 */
 public static function read($cachePath = "", $expire = 1800)
 {
 self::$cacheFile = self::getCacheFile($cachePath);
 //静态缓存文件存在,且没有过期,则直接读取
 if (file_exists(self::$cacheFile) && (time() < (filemtime(self::$cacheFile) + $expire))) {
 return readfile(self::$cacheFile);
 } else {
 ob_start();
 return false;
 }
 }

 /**
 * 写入静态缓存文件
 */
 public static function write()
 {
 $contents = ob_get_contents();
 if (strlen($contents) > 0) {
 file_put_contents(self::$cacheFile, $contents);
 }
 ob_end_flush();
 flush();
 }
}