用php實現proxy功能的示範[已升級至v0.0.2]

簡介：這是用php實現proxy功能的示範[已升級至v0.0.2]的詳細頁面，介紹了和php,有關的知識、技巧、經驗，和一些php源碼等。

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剛剛寫的練手的作品。感覺還是有些實用價值的。。放出來給大家試試。

功能：通過php實現代理功能

適用使用者：在家下載較慢。且懶得找proxy。且有高速主機，且主機有php，且主機支援socket。

使用方法：

1。把本程式傳到主機上

2。通過瀏覽器瀏覽主機上的此檔案

3。在url中填入欲下載的檔案地址（如果有必要，可以填入referer）

4。點擊get proxy url

5。新開啟的頁面中的連結即為通過proxy下載的連結

注意：

1。支援多線程下載,斷點續傳

2。僅支援http協議

3。不支援伺服器端header重新導向

4。不支援http auth

5。下載較大的檔案時，可以修改程式中set_time_limit的值，以減少斷線的現象（預設為180，即3分鐘）

PHP代碼:--------------------------------------------------------------------------------

<?php

/***************************************/

/* */

/* Php Http Proxy */

/* version: 0.0.2 */

/* last modify: 2005.1.12 */

/* author: q3boy<q3boy@sina.com> */

/* */

/***************************************/

set_time_limit(180);

define('PP_ERROR_CODE',1);

define('PP_ERROR_MESSAGE',2);

define('PP_ERROR_ALL',3);

define('PP_RETURN_STRING',1);

define('PP_RETURN_ARRAY',2);

define('PP_RETURN_ALL',3);

class CPhpProxy {

var $_strUrl;

var $_arrArgv;

var $_strRef;

var $_arrUrl;

var $_resSocket;

var $_intError;

var $_strError;

var $_arrDefaultArrayUrl;

var $_arrDefaultPort;

function CPhpProxy($strUrl = null, $arrArgv = array()) {

$this->init();

is_null($strUrl)?':$this->setUrl($strUrl);

is_null($arrArgv['refer'])?':$this->setRef($arrArgv['refer']);

$this->proxy($strUrl,$arrArgv);

}

function setError($intError,$mixArgv=null) {

$this->_intError = $intError;

if($intError==1001) {

$this->_strError = "調用 $mixArgv 方法時參數傳遞出錯, 枚舉值不存在";

}elseif($intError==1) {

$this->_strError = "url 錯誤, url 格式不正確.\n".$mixArgvs;

}elseif($intError == 2) {

$this->_strError = "url 錯誤, 目前尚未支援此協議.\n".$mixArgvs;

}elseif($intError == 3) {

$this->_strError = "無法開啟 ".$this->_arrUrl['host'].':'.$this->_arrUrl['port']."\n".$mixArgv[0].': '.$mixArgv[1];

}

Return false;

}

function getError($enumReturnType=PP_ERROR_CODE) {

if($enumReturnType==PP_ERROR_ALL) {

Return array(str_pad($this->_intError,5,'0',STR_PAD_LEFT),$this->_strError);

}elseif($enumReturnType==PP_ERROR_MESSAGE) {

Return $this->_strError;

}elseif($enumReturnType==PP_ERROR_CODE) {

Return $this->_intError;

}else {

Return false;

}

}

function init() {

$this->_strUrl = null;

$this->_arrArgv = array();

$this->_strRef = null;

$this->_arrUrl = array();

$this->_resSocket = null;

$this->_intError = 0;

$this->_strError = 'there is no error';

//arrurl 預設值

$this->_arrDefaultArrayUrl = array('protocol'=>'http','file'=>'index.htm');

//預設連接埠

$this->_arrDefaultPort =array('http'=>'80');

Return true;

}

function setUrl($strUrl) {

$strUrl = trim($strUrl);

//正則

$reg = "/^(([\w]+):\/\/)?([^:|\/|@]*:)?([^:|\/|@]*@)?([\w|\-|\.]+)(:\d+)?(\/[^\?|#]*)?(\?[^#]*)?(#.*)?$/is";

if(!preg_match($reg,$strUrl,$arrUrl)) {

Return $this->setError(1,$strUrl);

}else {

//拆解匹配數組

list($tmp, $tmp, $arr['protocol'], $arr['user'], $arr['pass'], $arr['host'], $arr['port'], $arr['path'], $arr['query'], $arr['anchor']) = $arrUrl;

//預設協議

if(!$arr['protocol']) {

$arrUrl[1] = $this->_arrDefaultArrayUrl['protocol'].'://';

}

//設 filename

$arr['file'] = basename($arr['path']);

//預設值

foreach($this->_arrDefaultArrayUrl as $key=>$val) {

if($arr[$key] == ') {

$arr[$key] = $val;

}

}

//預設連接埠

if(is_null($this->_arrDefaultPort[$arr['protocol']])) {

Return $this->setError(2,$arr['protocol']);

}elseif(!$arr['port']) {

$arr['port'] = $this->_arrDefaultPort[$arr['protocol']];

}

//設 uri

$arr['uri'] = ($arr['path']?$arr['path']:'/') . ($arr['query']?'?'.$arr['query']:') . ($arr['anchor']?'#'.$arr['anchor']:');

//設 url

unset($arrUrl[0]);

unset($arrUrl[2]);

$this->_strUrl = implode(',$arrUrl);

//設 arrurl

$this->_arrUrl = $arr;

Return true;

}

}

function getUrl($enumReturnType = PP_RETURN_ARRAY) {

if($enumReturnType==PP_RETURN_STRING) {

Return $this->_strUrl;

}elseif($enumReturnType==PP_RETURN_ARRAY) {

Return $this->_arrUrl;

}if($enumReturnType==PP_RETURN_ALL) {

Return array($this->_strUrl,$this->_arrUrl);

}else {

Return $this->setError(1001);

}

}

function setRefer($strRef) {

$this->_strRef = trim($strRef);

Return true;

}

function getRefer() {

Return $this->_strRef;

}

function getProxyUrl() {

global $_SERVER;

list($strProcotol) = explode('/',strtolower(trim($_SERVER['SERVER_PROTOCOL'])));

$str = $strProcotol.'://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].

'?u='.urlencode($this->getUrl(PP_RETURN_STRING)).

($this->getRefer()?('&r='.urlencode($this->getRefer())):');

Return $str;

}

function openSocket() {

$arr = $this->getUrl();

$this->_resSocket = @fsockopen($arr['host'],$arr['port'],$intError, $strError, 30);

if(!$this->_resSocket) {

$this->_resSocket = null;

Return $this->setError(3,array($intError, $strError));

}else {

Return true;

}

}

function getRequest() {

Return $this->{'get'.ucfirst($this->_arrUrl['protocol']).'Request'}();

}

function sendRequest() {

Return fwrite($this->_resSocket,$this->getRequest());

}

function flushResponse() {

Return $this->{'flush'.ucfirst($this->_arrUrl['protocol']).'Response'}();

}

function getHttpRequest() {

$arr = $this->getUrl();

$arrRequest = getallheaders();

$arrRequest['Host'] = $arr['host'];

$strRequest = "GET ".$arr['uri']." HTTP/1.1\r\n";

foreach($arrRequest as $key=>$val) {

$strRequest .="$key: $val\r\n";

}

$strRequest .="\r\n";

Return $strRequest;

}

function flushHttpResponse() {

$bolHeader=true;

while (!feof($this->_resSocket)) {

$str = fgets($this->_resSocket, 4096);

if($bolHeader) {

@header($str);

}else {

echo($str);

}

if($bolHeader && $str=="\r\n") {

$bolHeader=false;

@header("Content-type: application/gzip");

@header('Content-Disposition: attachment; filename="'.$this->_arrUrl['file'].'"');

}

}

Return true;

}

function close() {

fclose($this->_resSocket);

$this->_resSocket = null;

Return true;

}

function proxy($strUrl = null,$arrArgv = array()) {

if(!is_null($this->getUrl(PP_RETURN_STRING)) && $this->openSocket() && $this->sendRequest() && $this->flushResponse()) {

echo(123);

$this->close();

}else {

Return false;

}

}

}

if(sizeof($_GET)) {

$strGetArrayName = '_GET';

}elseif(sizeof($HTTP_GET_VARS)) {

$strGetArrayName = 'HTTP_GET_VARS';

}else {

die('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html">

<title>PhpProxy</title>

<style type="text/css">

<!--body,td {font-family: verdana; font-size: 12px;}th,input {font-family: verdana;}-->

</style>

</head>

<body>

<form name="form1" method="get" action="'.$_SERVER['PHP_SELF'].'">

<table width="500" border="1" align="center" cellpadding="5" cellspacing="1">

<tr>

<th colspan="2">PhpProxy</th>

</tr>

<tr>

<td width="39" nowrap>URL:</td>

<td width="432"><input name="u" type="text" id="u" size="60"></td>

</tr>

<tr>

<td nowrap>REFERER:</td>

<td><input name="r" type="text" id="r" size="60"></td>

</tr>

<tr>

<td colspan="2" align="center"><input name="act" value="make" type="hidden">

<input type="submit" value="Get Proxy Url">

<input type="reset" value="Reset"></td>

</tr>

</table>

</form>

</body>

</html>');

}

$strUrl = trim(${$strGetArrayName}['u']);

if($strUrl==') {

die('請輸入 url 地址.');

}

//get referer

$strRefTmp = trim(${$strGetArrayName}['r']);

//初始化 proxy 類

$objProxy = new CPhpProxy();

//設定 url 和 refer

$objProxy->setUrl($strUrl);

$objProxy->setRefer($strRef);

//錯誤輸出

if($objProxy->getError()) {

die($objProxy->getError(PP_ERROR_MESSAGE));

}

//echo url for download

if(${$strGetArrayName}['act']=='make') {

die("<center><h4><a href='".$objProxy->getProxyUrl()."'>點擊此處通過 PhpProxy 下載檔案</a></h2></center>");

}

//取檔案

$objProxy->proxy();

//錯誤處理

if($objProxy->getError()) {

die($objProxy->getError(PP_ERROR_MESSAGE));

}

?>

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