<?php
/*
+--------------------------------------------------------------------------
|   WeCenter [#RELEASE_VERSION#]
|   ========================================
|   by WeCenter Software
|   © 2011 - 2014 WeCenter. All Rights Reserved
|   http://www.wecenter.com
|   ========================================
|   Support: WeCenter@qq.com
|
+---------------------------------------------------------------------------
*/


if (!defined('IN_ANWSION'))
{
	die;
}

class main extends AWS_CONTROLLER
{
	public function download_action()
	{
		$url = @base64_decode($_GET['url']);
		if (! $url){
			HTTP::error_404();
		}
		$path = get_setting('upload_dir') .  str_replace(get_setting('upload_url'), '', $url);
		if (strstr($path, '..') OR !file_exists($path)){
			HTTP::error_404();
		}
		if($this->_do_ismac()) {
			$extend = $this->_getFileType(
base64_decode($_GET['file_name'])); 
			if(file_exists($path.'.'.$extend)){	
				$path=$path.'.'.$extend;
				$url_file=base64_decode($_GET['file_name']).'.'.$extend;
				$this->_do_kill($path);
			}else{
				if (copy($path,$path.'.'.$extend)){
					$path=$path.'.'.$extend;
					$url_file=base64_decode($_GET['file_name']).'.'.$extend;
					$this->_do_kill($path);
				}else{
					$url_file=base64_decode($_GET['file_name']);
				}
			}
		}else{
			$url_file=base64_decode($_GET['file_name']);
		}
		HTTP::force_download_header($url_file, filesize($path));
		readfile($path);
	}
	/*
		@author help@vbadu.net
		$path 本地文件路径
		$timeout 多久删除
		$basetime 秒数
		示例：$timeout=10,$basetime=60。那么$timeout*$basetime就是10*60秒=10分种后自动删除
	*/
	private function _do_kill($path,$timeout=10,$basetime=60){
		ignore_user_abort();
		if (!strpos($path, '.')) return;
		$mtime=filemtime($path); 
		$now=time(); 
		if(is_file($path) && ($now-$mtime) > ($timeout*$basetime)){ 
			unlink($path); 
		}
	}
	/*
		@author help@vbadu.net
		判断是否苹果设备，返回值为true或false
	*/
	private function _do_ismac(){
		if(strpos($_SERVER['HTTP_USER_AGENT'], 'Safari') || strpos($_SERVER['HTTP_USER_AGENT'], 'iphone') || strpos($_SERVER['HTTP_USER_AGENT'], 'ipod') || strpos($_SERVER['HTTP_USER_AGENT'], 'ipad')) {
			return true;
		}
		return false;
	}
	/*
		@author 雷小达
		处理文件后缀
	*/
	private function _getFileType($url){
			$filearr = explode(".",$url);
			$filetype = end($filearr);
			return $filetype;
	}
}