이미지에 대한 안티 핫링크 크래킹을 구현하는 PHP 방법 [이미지/역방향 프록시에 대한 안티 핫링크 문제 해결]

$value){ $this->$key=$value; } } public function getImg($imgUrl){ $this->imgUrl=$imgUrl; /\*\* 处理url \*/ if(substr($this->imgUrl,0,7)!=='http://' && substr($this->imgUrl,0,8)!=='https://'){ $this->imgUrl='http://'.$this->imgUrl; } /\*\* 解析url中的host \*/ $url\_array=parse\_url($this->imgUrl); /\*\* 设置referer \*/ $this->referer=$this->referer==""?'http://'.$url\_array\['host'\]:$this->referer; /\*\*开始获取 \*/ $this->urlOpen(); $this->imgBody; /\*\*处理错误 \*/ if($this->imgCode!=200){ $this->error(1); exit(); } /\*\*获取图片格式 \*/ preg\_match("/Content-Type: image\\/(.+?)\\n/sim",$this->imgHeader,$result); /\*\*看看是不是图片 \*/ if(!isset($result\[1\])){ $this->error(2); exit(); }else{ $this->imgType=$result\[1\]; } /\*\* 输出内容 \*/ $this->out(); } private function out(){ /\*\* gif 不处理，直接出图 \*/ if($this->imgType=='gif'){ header("Content-Type: image/gif"); echo $this->imgBody; exit(); } header("Content-Type: image/png"); /\*\* 其他类型的，加水印 \*/ $im=imagecreatefromstring($this->imgBody); $white = imagecolorallocate($im, 255, 255, 255); /\*加上水印\*/ if($this->water){ imagettftext($im, 12, 0, 20, 20, $white, "/fonts/hwxh.ttf", $this->water); } imagepng($im); } private function error($err){ header("Content-Type: image/jpeg"); $im=imagecreatefromstring(file\_get\_contents('./default.jpg')); imagejpeg($im); } private function urlOpen() { $ch = curl\_init(); curl\_setopt($ch, CURLOPT\_URL, $this->imgUrl); curl\_setopt($ch, CURLOPT\_USERAGENT, $this->ua); curl\_setopt ($ch,CURLOPT\_REFERER,$this->referer); curl\_setopt($ch, CURLOPT\_RETURNTRANSFER, 1); curl\_setopt($ch, CURLOPT\_HEADER, 1); /\*\*跳转也要 \*/ curl\_setopt($ch, CURLOPT\_FOLLOWLOCATION, true); /\*\* 支持https \*/ $opt\[CURLOPT\_SSL\_VERIFYHOST\] = 2; $opt\[CURLOPT\_SSL\_VERIFYPEER\] = FALSE; curl\_setopt\_array($ch, $opt); $response = curl\_exec($ch); $this->imgCode=curl\_getinfo($ch, CURLINFO\_HTTP\_CODE) ; if ($this->imgCode == '200') { $headerSize = curl\_getinfo($ch, CURLINFO\_HEADER\_SIZE); $this->imgHeader = substr($response, 0, $headerSize); $this->imgBody = substr($response, $headerSize); return ; } curl\_close($ch); } } $img=new ImgBridge(array('water'=>'')); $img->getImg(strstr($\_SERVER\["QUERY\_STRING"\], "http"));