cdn/include/controller.php

<?php

if ( ! defined('BASE_PATH')) exit('No direct script access allowed');

class controller{
	
	public $content_type;
	
	public $succeed ;
	
	public $error_type;
	
	public function __construct($request = ''){
		
		$this->content_type = 'text/html';
		$this->error_type = 0;
		$this->succeed = TRUE;
		
		$request = ltrim($request,'/');
		
		//是否为SAE环境
		if(!IS_SAE || !class_exists('SaeStorage')){//
			$this->error_type = 2;
			$this->succeed = FALSE;
		}
		
		//请求为空
		elseif($request === ''){
			
			//显示欢迎页面
			if(WELCOME_DOC){
				view::show('welcome');
				return ;
			}else{
				$this->error_type = 1;
				$this->succeed = FALSE;
			}
		}
		
		else{
			//匹配文件后缀
			$temp = array();
			if(preg_match('/\.(jpg|jpeg|png|pdf|gif|css|js|zip)$/i', $request,$temp)===1){//暂时先就这几种
				//http://en.wikipedia.org/wiki/Internet_media_type#List_of_common_media_types
				switch($temp[1]){
					case 'jpg':{$this->content_type="image/jpeg";}break;
					case 'gif':{$this->content_type="image/gif";}break;
					case 'png':{$this->content_type="image/png";}break;
					case 'css':{$this->content_type="text/css";}break;
					case 'js':{$this->content_type="text/javascript";}break;
				}
			}
		}
		
		//开始处理
		$this->handle($request);
		
	}
	/**
	 * 获取内容并输出
	 * 如果stroage里面不存在，则从URL里面获取
	 * */
	private function handle($filename){
		$content = '';
		if($this->succeed){
			$storage = new storage();
			if($storage->exists($filename)){
				$content = $storage->read($filename);
			}else{
				$content = @file_get_contents(BASE_URL.$filename);
				$storage->write($filename, $content);
			}
			if(empty($content)){
				$this->error_type = 3;
				$this->succeed = FALSE;
			}else{
				//这里应该有更多的检查
			}
		}
		//显示内容
		$this->render($content);
	}
	
	
	/**
	 * 输出结果，包括缓存控制等
	 * */
	private function render($content=''){
		if(!$this->succeed){
			$this->error();
			return ;
		}else{
			header("Expires: " . date("D, j M Y H:i:s GMT", time()+2592000));//缓存一月
			header('Content-type: '.$this->content_type);
			echo $content;
		}
	}
	
	/**
	 * 处理错误
	 * */
	private function error(){
		echo "<strong>something seems wrong.</strong>";
	}
	
	
}