PHP reverse proxy class code, php reverse proxy_PHP tutorial

PHP reverse proxy class code, php reverse proxy

Adapted from PHP Reverse Proxy PRP, it corrects some errors in the original version, supports file upload and uploaded file type identification, supports specified IP, and adapts to the SAE environment.

How to use

<&#63;php
$proxy=new PhpReverseProxy();
$proxy->port="8080";
$proxy->host="www.jb51.net";
//$proxy->ip="1.1.1.1";
$proxy->forward_path="";
$proxy->connect();
$proxy->output();
&#63;>

Source code

<&#63;php
//Source Code: http://www.xiumu.org/technology/php-reverse-proxy-class.shtml
class PhpReverseProxy{
 public $publicBaseURL;
 public $outsideHeaders;
 public $XRequestedWith;
 public $sendPost;
 public $port,$host,$ip,$content,$forward_path,$content_type,$user_agent,
  $XFF,$request_method,$IMS,$cacheTime,$cookie,$authorization;
 private $http_code,$lastModified,$version,$resultHeader;
 const chunkSize = 10000;
 function __construct(){
  $this->version="PHP Reverse Proxy (PRP) 1.0";
  $this->port="8080";
  $this->host="127.0.0.1";
  $this->ip="";
  $this->content="";
  $this->forward_path="";
  $this->path="";
  $this->content_type="";
  $this->user_agent="";
  $this->http_code="";
  $this->XFF="";
  $this->request_method="GET";
  $this->IMS=false;
  $this->cacheTime=72000;
  $this->lastModified=gmdate("D, d M Y H:i:s",time()-72000)." GMT";
  $this->cookie="";
  $this->XRequestedWith = "";
  $this->authorization = "";
 }
 function translateURL($serverName) {
  $this->path=$this->forward_path.$_SERVER['REQUEST_URI'];
  if(IS_SAE)
   return $this->translateServer($serverName).$this->path;
  if($_SERVER['QUERY_STRING']=="")
   return $this->translateServer($serverName).$this->path;
  else
  return $this->translateServer($serverName).$this->path."&#63;".$_SERVER['QUERY_STRING'];
 }
 function translateServer($serverName) {
  $s = empty($_SERVER["HTTPS"]) &#63; ''
   : ($_SERVER["HTTPS"] == "on") &#63; "s"
   : "";
  $protocol = $this->left(strtolower($_SERVER["SERVER_PROTOCOL"]), "/").$s;
  if($this->port=="") 
   return $protocol."://".$serverName;
  else
   return $protocol."://".$serverName.":".$this->port;
 }
 function left($s1, $s2) {
  return substr($s1, 0, strpos($s1, $s2));
 }
 function preConnect(){
  $this->user_agent=$_SERVER['HTTP_USER_AGENT'];
  $this->request_method=$_SERVER['REQUEST_METHOD'];
  $tempCookie="";
  foreach ($_COOKIE as $i => $value) {
   $tempCookie=$tempCookie." $i=$_COOKIE[$i];";
  }
  $this->cookie=$tempCookie;
  if(empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
   $this->XFF=$_SERVER['REMOTE_ADDR'];
  } else {
   $this->XFF=$_SERVER['HTTP_X_FORWARDED_FOR'].", ".$_SERVER['REMOTE_ADDR'];
  }
 
 }
 function connect(){
  if(empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
   $this->preConnect();
   $ch=curl_init();
   if($this->request_method=="POST"){
    curl_setopt($ch, CURLOPT_POST,1);
 
    $postData = array();
    $filePost = false;
    $uploadPath = 'uploads/';
    if (IS_SAE)
      $uploadPath = SAE_TMP_PATH;
 
    if(count($_FILES)>0){
      if(!is_writable($uploadPath)){
        die('You cannot upload to the specified directory, please CHMOD it to 777.');
      }
      foreach($_FILES as $key => $fileArray){ 
        copy($fileArray["tmp_name"], $uploadPath . $fileArray["name"]);
        $proxyLocation = "@" . $uploadPath . $fileArray["name"] . ";type=" . $fileArray["type"];
        $postData = array($key => $proxyLocation);
        $filePost = true;
      }
    }
 
    foreach($_POST as $key => $value){
      if(!is_array($value)){
     $postData[$key] = $value;
      }
      else{
     $postData[$key] = serialize($value);
      }
    }
 
    if(!$filePost){
      //$postData = http_build_query($postData);
      $postString = "";
      $firstLoop = true;
      foreach($postData as $key => $value){
      $parameterItem = urlencode($key)."=".urlencode($value);
      if($firstLoop){
     $postString .= $parameterItem;
      }
      else{
     $postString .= "&".$parameterItem;
      }
      $firstLoop = false; 
      }
      $postData = $postString;
    }
 
    //echo print_r($postData);
 
    //curl_setopt($ch, CURLOPT_VERBOSE, 0);
    //curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    //curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible;)");
    $this->sendPost = $postData;
    //var_dump(file_exists(str_replace('@','',$postData['imgfile'])));exit;
    curl_setopt($ch, CURLOPT_POSTFIELDS,$postData);
    //curl_setopt($ch, CURLOPT_POSTFIELDS,file_get_contents($proxyLocation));
    //curl_setopt($ch, CURLOPT_POSTFIELDS,file_get_contents("php://input"));
   }
 
   //gets rid of mulitple &#63; in URL
   $translateURL = $this->translateURL(($this->ip)&#63;$this->ip:$this->host);
   if(substr_count($translateURL, "&#63;")>1){
     $firstPos = strpos($translateURL, "&#63;", 0);
     $secondPos = strpos($translateURL, "&#63;", $firstPos + 1);
     $translateURL = substr($translateURL, 0, $secondPos);
   }
 
   curl_setopt($ch,CURLOPT_URL,$translateURL);
 
   $proxyHeaders = array(
     "X-Forwarded-For: ".$this->XFF,
     "User-Agent: ".$this->user_agent,
     "Host: ".$this->host
   );
 
   if(strlen($this->XRequestedWith)>1){
     $proxyHeaders[] = "X-Requested-With: ".$this->XRequestedWith;
     //echo print_r($proxyHeaders);
   }
 
   curl_setopt($ch,CURLOPT_HTTPHEADER, $proxyHeaders);
 
   if($this->cookie!=""){
    curl_setopt($ch,CURLOPT_COOKIE,$this->cookie);
   }
   curl_setopt($ch,CURLOPT_FOLLOWLOCATION,false); 
   curl_setopt($ch,CURLOPT_AUTOREFERER,true); 
   curl_setopt($ch,CURLOPT_HEADER,true);
   curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
 
   $output=curl_exec($ch);
   $info = curl_getinfo( $ch );
   curl_close($ch);
   $this->postConnect($info,$output);
  }else {
   $this->lastModified=$_SERVER['HTTP_IF_MODIFIED_SINCE'];
   $this->IMS=true;
  }
 }
 function postConnect($info,$output){
  $this->content_type=$info["content_type"];
  $this->http_code=$info['http_code'];
  //var_dump($info);exit;
  if(!empty($info['last_modified'])){
   $this->lastModified=$info['last_modified'];
  }
  $this->resultHeader=substr($output,0,$info['header_size']);
  $content = substr($output,$info['header_size']);
 
  if($this->http_code=='200'){
   $this->content=$content;
  }elseif( ($this->http_code=='302' || $this->http_code=='301') && isset($info['redirect_url'])){
   $redirect_url = str_replace($this->host,$_SERVER['HTTP_HOST'],$info['redirect_url']);
   if (IS_SAE)
     $redirect_url = str_replace('http://fetchurl.sae.sina.com.cn/','',$info['redirect_url']);
   header("Location: $redirect_url");
   exit;
  }elseif($this->http_code=='404'){
   header("HTTP/1.1 404 Not Found");
   exit("HTTP/1.1 404 Not Found");
  }elseif($this->http_code=='500'){
   header('HTTP/1.1 500 Internal Server Error');
   exit("HTTP/1.1 500 Internal Server Error");
  }else{
   exit("HTTP/1.1 ".$this->http_code." Internal Server Error");
  }
 }
 
 function output(){
  $currentTimeString=gmdate("D, d M Y H:i:s",time());
  $expiredTime=gmdate("D, d M Y H:i:s",(time()+$this->cacheTime));
 
  $doOriginalHeaders = true;
  if($doOriginalHeaders){
    if($this->IMS){
     header("HTTP/1.1 304 Not Modified");
     header("Date: Wed, $currentTimeString GMT");
     header("Last-Modified: $this->lastModified");
     header("Server: $this->version");
    }else{
 
     header("HTTP/1.1 200 OK");
     header("Date: Wed, $currentTimeString GMT");
     header("Content-Type: ".$this->content_type);
     header("Last-Modified: $this->lastModified");
     header("Cache-Control: max-age=$this->cacheTime");
     header("Expires: $expiredTime GMT");
     header("Server: $this->version");
     preg_match("/Set-Cookie:[^\n]*/i",$this->resultHeader,$result);
     foreach($result as $i=>$value){
      header($result[$i]);
     }
     preg_match("/Content-Encoding:[^\n]*/i",$this->resultHeader,$result);
     foreach($result as $i=>$value){
      //header($result[$i]);
     }
     preg_match("/Transfer-Encoding:[^\n]*/i",$this->resultHeader,$result);
     foreach($result as $i=>$value){
      //header($result[$i]);
     }
     echo($this->content);
     /*
     if(stristr($this->content, "error")){
    echo print_r($this->sendPost);
     }
     */
    }
  }
  else{
    $headerString = $this->resultHeader; //string 
    $headerArray = explode("\n", $headerString);
    foreach($headerArray as $privHeader){
   header($privHeader);
    }
 
    if(stristr($headerString, "Transfer-encoding: chunked")){
   flush();
   ob_flush();
   $i = 0;
   $maxLen = strlen($this->content);
 
   while($i < $maxLen){
     $endChar = $i + self::chunkSize;
     if($endChar >= $maxLen){
    $endChar = $maxLen - 1;
     }
     $chunk = substr($this->content, $i, $endChar);
     $this->dump_chunk($chunk);
     flush();
     ob_flush();
     $i = $i + $endChar;
   }
    }
    else{
    echo($this->content);
    }
 
    //echo "header: ".print_r($headerArray);
    //header($this->resultHeader);
  }
 
 }
 
 
 function dump_chunk($chunk) {
   echo sprintf("%x\r\n", strlen($chunk));
   echo $chunk;
   echo "\r\n";
 }
 
 
 function getOutsideHeaders(){
   $headers = array();
   foreach ($_SERVER as $name => $value){ 
  if (substr($name, 0, 5) == 'HTTP_') { 
    $name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5))))); 
    $headers[$name] = $value; 
  }elseif ($name == "CONTENT_TYPE") { 
    $headers["Content-Type"] = $value; 
  }elseif ($name == "CONTENT_LENGTH") { 
    $headers["Content-Length"] = $value; 
  }elseif(stristr($name, "X-Requested-With")) { 
    $headers["X-Requested-With"] = $value;
    $this->XRequestedWith = $value;
  }
   } 
 
   //echo print_r($headers);
 
   $this->outsideHeaders = $headers;
   return $headers;
 } 
 
}
&#63;>

How to write such a PHP proxy

Edit the domain name redirection code yourself, for example, create a new domain name access address and create an index.php file in the main directory. Then use the code in this file to obtain the domain name, and then use a judgment statement. If it is judged that the domain name "www.a.com/sd. htm" and let it redirect to a directory on the server. Or set it in .htaccess. This setting is available in many frameworks. However, some servers do not support this file or do not support part of the content in the file, so the website may not be usable. Please try it yourself. .

php calls another class method, the following code cannot be executed, why

a.php file
# Here we must first introduce the storage file containing class b.
include 'b.php'
class a{
public static function a1( ){
private static function a2(){
self::$b = b::b() ;
}
}
}
b.php file
class b{
public static b(){
return ^^^^^;
}
}

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