PHP文件与图片防盗链处理类

002 /** 

003  * 

004  * 防盗链外部资源下载处理类 

005  *  

006  * @author 清风  

007  * @link   http://blog.emtalk.net 

008  *  

009  */

010 class BurglarDow{ 

011     /** 

012      * 初始许可下载状态 

013      * @var    allow 

014      * @access private 

015      */

016     private $allow      =  false; 

017     /** 

018      * 初始下载地址 

019      * @var    dowUrl 

020      * @access private 

021      */

022     private $dowUrl     =  null; 

023     /** 

024      * 初始来路域名 

025      * @var    RemoteUrl 

026      * @access private 

027      */

028     private $RemoteUrl  =  null; 

029     /** 

030      * 初始许可资源取用域名列表 

031      * @var    allowUrl 

032      * @access private 

033      */

034     private $allowUrl   =  array(); 

035     /** 

036      * 初始转跳地址 

037      * @var    Location 

038      * @access private 

039      */

040     private $Location   =  null; 

041   

042     public function __construct($dowUrl,$Location,array $allowUrl){ 

043         // 初始下载地址 

044         $this->dowUrl   = $dowUrl; 

045         // 初始许可资源取用域名列表 

046         $this->allowUrl = $allowUrl; 

047         // 初始转跳地址 

048         $this->Location = $Location; 

049   

050         $this->RemoteUrl = @parse_url($_SERVER['HTTP_REFERER']);                                                      // 获取来路域名 

051         if(!is_array($this->RemoteUrl)) 

052             header("HTTP/1.1 301 Moved Permanently"); 

053             header("Location: ".$this->Location); 

054   

055         if(isset($this->RemoteUrl['host'])){ 

056             if(in_array($this->RemoteUrl['host'],$this->allowUrl)){                                                   // 判断是否来至许可域名 

057                 $this->allow  = true;                                                                                 // 下载许可状态为：真 

058             } 

059         } 

060         unset($this->allowUrl,$this->RemoteUrl);                                                                      // 释放内存变量 

061     } 

062   

063     /** 

064      * 防盗链资源下载 

065      * @access public 

066      * @return mixed 

067      */

068     public function dow(){ 

069         $FileInfo = get_headers($this->dowUrl,1);                                                                     // 获取远程文件头部信息 

070   

071         if(true === $this->allow){                                                                                    // 判断是否许可下载资源 

072             //判断配置文件是否存在 

073             if(is_file('Config.ini')){ 

074                 $FileCon = parse_ini_file('Config.ini'); 

075             }else{ 

076                 $FileName   =  basename($FileInfo['Content-Location']); 

077                 $FileConStr = "FileName  = {$FileName}rnFileUrl   = {$FileInfo['Content-Location']}rnFileSize   = {$FileInfo['Content-Length']}"; 

078                 $handle = fopen ('Config.ini', "wb");                                                                 // Config.ini文件不存在则创建文件 

079                 if (fwrite ($handle, $FileConStr) == FALSE) {                                                         // 数据写入文件  

080                     echo "File creation failed ...";  

081                 } 

082                 fclose ($handle);                                                                                     // 关闭一个已打开的文件指针 

083                 $FileCon = parse_ini_file('Config.ini'); 

084             } 

085             if(!empty($$this->dowUrl)){ 

086                 $fp = @fopen($$this->dowUrl, "rb");                                                                   // 二进制模式读取文件 

087                 if (!$fp) 

088                      exit("Download a mistake.nn"); 

089   

090                 // 输出远程资源 

091                 header("Content-type:text/html;charset=utf-8"); 

092                 header('Content-Description: File Transfer'); 

093                 header('Content-Type: application/octet-stream'); 

094                 header('Content-Disposition: attachment; filename='.$FileCon['FileName']); 

095                 header("Accept-Ranges: bytes"); 

096                 header('Content-Transfer-Encoding: binary'); 

097                 header('Expires: 0'); 

098                 header('Cache-Control:must-revalidate,post-check=0,pre-check=0'); 

099                 header('Pragma: public'); 

100                 header('Content-Length: '.$FileCon['FileSize']); 

101                 while (!feof($fp)){ 

102                     set_time_limit(0);                                                                                 // 设置文件最长执行时间 

103                     echo fread($fp, 1024);                                                                             // 输出文件 

104                     flush();                                                                                           // 输出缓冲 

105                     ob_flush();                                                                                        // 输出缓冲区中的内容 

106                 } 

107                 fclose($fp); 

108             }else{ 

109                 header("HTTP/1.1 404 Not Found"); 

110             } 

111         }else{ 

112             header("HTTP/1.1 301 Moved Permanently"); 

113             header("Location: ".$this->Location); 

114         } 

115     } 

116 } 

117 // 远程资源地址 

118 $dowUrl = '/qq/QQ5.1/10055/QQ5.1.exe'; 

119 // 转跳地址 

120 $Location = 'http://www.111com.net'; 

121 // 许可来路域名列表 

122 $allowUrl = array( 

123     'blog.emtalk.net', 

124 ); 

125 $BurglarDow = new BurglarDow($dowUrl,$Location,$allowUrl); 

126 $BurglarDow -> dow();