PHP实现图片防盗链破解操作方法

<img src="http://www.likeyunba.com/2.php?url=https://image.135editor.com/files/users/740/7407329/201912/zTeFAx8R_Cmea.jpg" width="500" />

<?php

 class ImgBridge{

  private $water='';

  private $imgUrl=''; 

  private $referer='';

  private $ua='MQQBrowser/26 Mozilla/5.0 (Linux; U; Android 2.3.7; zh-cn; MB200 Build/GRJ22; CyanogenMod-7) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1';

  private $imgCode='';

  private $imgHeader='';

  private $imgBody='';

  private $imgType='';

  public function __construct($config=array()){

    foreach($config as $key=>$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"));