PHP写的资源下载防盗链类分享

php  /  管理员 发布于 7年前   222

<?php
/**
 * 防盗链外部资源下载处理类
 * @link   https://www.zongscan.com
 */
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 (!$fp)
          exit("Download a mistake.\n\n");
        // 输出远程资源
        header("Content-type:text/html;");
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename='.$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 = 'https://www.zongscan.com';
    
    // 许可来路域名列表
    $allowUrl = array(
     '.net.cn',
    );
    $BurglarDow = new BurglarDow($dowUrl,$Location,$allowUrl);
    $BurglarDow -> dow();