<?php /**  *  * 防盗链外部资源下载处理类  *  * @link   http://jb51.net  *  */ 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://jb51.net'; // 许可来路域名列表 $allowUrl = array(  'jb51.net', ); $BurglarDow = new BurglarDow($dowUrl,$Location,$allowUrl); $BurglarDow -> dow();