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PHP写的资源下载防盗链类分享

发布时间:2022-06-22 09:11:40 所属栏目:PHP教程 来源:互联网
导读:这篇文章主要介绍了PHP写的资源下载防盗链类分享,需要的朋友可以参考下,这几天在写一个PHP防盗链外部资源下载处理函数,昨天晚上刚完成编写,中间遇到了些问题,这里就不详述了; 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);
  这篇文章主要介绍了PHP写的资源下载防盗链类分享,需要的朋友可以参考下,这几天在写一个PHP防盗链外部资源下载处理函数,昨天晚上刚完成编写,中间遇到了些问题,这里就不详述了;
 
  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);代码如下:
 
  <?php
  /**
   *
   * 防盗链外部资源下载处理类
   *
   * @link   http://phpfensi.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}rnFileUrl   = {$FileInfo['Content-Location']}rnFileSize   = {$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(!emptyempty($$this->dowUrl)){
      $fp = @fopen($$this->dowUrl, "rb");                                                                   // 二进制模式读取文件
      if (!$fp)
        exit("Download a mistake.nn");
   
      // 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://phpfensi.com';
  // 许可来路域名列表
  $allowUrl = array(
   'jb51.net',
  );
  $BurglarDow = new BurglarDow($dowUrl,$Location,$allowUrl);
  $BurglarDow -> dow(); 

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