PHP防盗链外部资源下载处理类

PHP防盗链外部资源下载处理类

以下是自写的简单的PHP防盗链处理类(重新整理编写成类文件，以便后期改进)；

/**
 *
 * 防盗链外部资源下载处理类
 */
class BurglarDow{
	/**
     * 初始许可下载状态
     * @var    allow
     * @access private
     */
	private $allow      =  false;
	/**
     * 初始下载地址
     * @var    dowUrl
     * @access private
     */
	private $dowUrl     =  null;
	/**
     * 初始来路域名
     * @var    RemoteUrl
     * @access private
     */
	private $RemoteUrl  =  null;
	/**
     * 初始许可资源取用域名列表
     * @var    allowUrl
     * @access private
     */
	private $allowUrl   =  array();
	/**
     * 初始转跳地址
     * @var    Location
     * @access private
     */
	private $Location   =  null;

	public function __construct($dowUrl,$Location,array $allowUrl){
		// 初始下载地址
		$this->dowUrl   = $dowUrl;
		// 初始许可资源取用域名列表
		$this->allowUrl = $allowUrl;
		// 初始转跳地址
		$this->Location = $Location;

		$this->RemoteUrl = @parse_url($_SERVER['HTTP_REFERER']);                                                      // 获取来路域名
		if(!is_array($this->RemoteUrl))
			header("HTTP/1.1 301 Moved Permanently");
			header("Location: ".$this->Location);

		if(isset($this->RemoteUrl['host'])){
			if(in_array($this->RemoteUrl['host'],$this->allowUrl)){                                                   // 判断是否来至许可域名
				$this->allow  = true;                                                                                 // 下载许可状态为：真
			}
		}
		unset($this->allowUrl,$this->RemoteUrl);                                                                      // 释放内存变量
	}

	/**
	 * 防盗链资源下载
	 * @access public
	 * @return mixed
	 */
	public function dow(){
		$FileInfo = get_headers($this->dowUrl,1);                                                                     // 获取远程文件头部信息

		if(true === $this->allow){                                                                                    // 判断是否许可下载资源
			//判断配置文件是否存在
			if(is_file('Config.ini')){
				$FileCon = parse_ini_file('Config.ini');
			}else{
				$FileName   =  basename($FileInfo['Content-Location']);
				$FileConStr = "FileName  = {$FileName}\r\nFileUrl   = {$FileInfo['Content-Location']}\r\nFileSize   = {$FileInfo['Content-Length']}";
				$handle = fopen ('Config.ini', "wb");                                                                 // Config.ini文件不存在则创建文件
				if (fwrite ($handle, $FileConStr) == FALSE) {                                                         // 数据写入文件 
					echo "File creation failed ..."; 
				}
				fclose ($handle);                                                                                     // 关闭一个已打开的文件指针
				$FileCon = parse_ini_file('Config.ini');
			}
			if(!empty($$this->dowUrl)){
				$fp = @fopen($$this->dowUrl, "rb");                                                                   // 二进制模式读取文件
				if (!$fp)
					 exit("Download a mistake.\n\n");

				// 

输出远程资源 header("Content-type:text/html;charset=utf-8"); header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename='.$FileCon['FileName']); header("Accept-Ranges: bytes"); header('Content-Transfer-Encoding: binary'); header('Expires: 0'); header('Cache-Control:must-revalidate,post-check=0,pre-check=0'); header('Pragma: public'); header('Content-Length: '.$FileCon['FileSize']); while (!feof($fp)){ set_time_limit(0); // 设置文件最长执行时间 echo fread($fp, 1024); // 输出文件 flush(); // 输出缓冲 ob_flush(); // 输出缓冲区中的内容 } fclose($fp); }else{ header("HTTP/1.1 404 Not Found"); } }else{ header("HTTP/1.1 301 Moved Permanently"); header("Location: ".$this->Location); } } } // 远程资源地址 $dowUrl = 'http://dldir1.qq.com/qqfile/qq/QQ5.1/10055/QQ5.1.exe'; // 转跳地址 $Location = 'http://www.scutephp.com'; // 许可来路域名列表 $allowUrl = array( 'blog.emtalk.net', ); $BurglarDow = new BurglarDow($dowUrl,$Location,$allowUrl); $BurglarDow -> dow();