liuxd · November 8, 2018 21:52
diff --git a/index.php b/index.php
 <?php

 namespace ladder;

 class Ladder
 {
    public function main()
    {
        $sURL = $this->getURL();

        if (empty($sURL)) {
            $this->showIndex();
        } else {
            $sContent = $this->getPage($sURL);
            $this->show($sContent, $sURL);
        }
    }

    private function showIndex()
    {
 echo <<<EOT
 <!DOCTYPE html>
 <html>
  <head>
    <meta charset="utf-8">
    <title>X-Ladder</title>
  </head>
  <body>
    <style>
      body {
        background-color: black;
      }
      #url {
        margin-top: 20%;
        padding: 10px;
        border: solid white 5px;
        font-size:30px;
        background-color: black;
        color: white;
      }
    </style>
    <center><input type="text" id="url" size=30></center>
    <script>
    (function(){
      var input = document.getElementById('url');
      input.focus();

      document.onkeydown = function(event){
        var e = event || window.event || arguments.callee.caller.arguments[0];

        if (e && e.keyCode == 13) {
          var url = input.value;

          if (url.substr(0, 4) !== 'http') {
              url = 'http://' + url;
          }

          location.href = '?url=' + url;
        }
      };

    })();
    </script>
  </body>
 </html>
 <!--
 EOT;
    }

    private function getURL()
    {
        return isset($_GET['url']) ? $_GET['url'] : '';
    }

    private function getPage($sURL)
    {
        return !empty($sURL) ? file_get_contents($sURL) : '';
    }

    private function show($sContent, $sURL)
    {
        $tmp = explode('.', $sURL);
        $ext = end($tmp);

        $bSendHeader = $this->sendHeader($ext);

        if (!$bSendHeader) {
            $sContent = str_replace('charset=GBK', 'charset=utf8', $sContent);
            $sContent = $this->processHTML($sContent, $sURL);
        }

        if (($pos = strpos($sURL, '?')) !== false) {
            $url = substr($sURL, 0, $pos);
            $tmp = explode('.', $url);
            $ext = end($tmp);

            $this->sendHeader($ext);
        }

        $sContent = gzencode($sContent, 9);
        header("Content-Encoding: gzip");
        header("Vary: Accept-Encoding");
        header("Content-Length: ".strlen($sContent));

        echo $sContent;
        echo "<!--";
    }

    private function processHTML($sContent, $sURL)
    {
        $aURLInfo = parse_url($sURL);
        preg_match_all('/ href=([\'"]).+?(\1)/', $sContent, $matches_href);

        foreach ($matches_href[0] as $match) {
            $url_href = trim(ltrim($match, ' href='), '"|\'');

            if ($url_href{0} === '#') {
                continue;
            }

            $sNewURL = '';

            if ($url_href{0} === '/') {
                $sNewURL = $aURLInfo['scheme'] . '://' . $aURLInfo['host'] . $url_href;
            } else if (substr($url_href, 0, 4) === 'http') {
                $sNewURL = $url_href;
            } else {
                $sNewURL = $aURLInfo['scheme'] . '://' . $aURLInfo['host'] . '/' . $url_href;
            }

            if (!empty($sNewURL)) {
                $sPlacement = ' href="http://' . $_SERVER['HTTP_HOST'] . '?url=' . $sNewURL . '"';
                $sContent = str_replace($match, $sPlacement, $sContent);
            }
        }

        preg_match_all('/ src=([\'"]).+?(\1)/', $sContent, $matches_src);

        foreach ($matches_src[0] as $match) {
            $url_src = trim(ltrim($match, ' src='), '"|\'');

            if (substr($url_src, 0, 2) === '//') {
                $sNewURL = $aURLInfo['scheme'] . ':' . $url_src;
            } else if ($url_src{0} === '/') {
                $sNewURL = $aURLInfo['scheme'] . '://' . $aURLInfo['host'] . $url_src;
            } else if (substr($url_src, 0, 4) === 'http') {
                $sNewURL = $url_src;
            } else {
                $sNewURL = $aURLInfo['scheme'] . '://' . $aURLInfo['host'] . '/' . $url_src;
            }

            $sPlacement = ' src="http://' . $_SERVER['HTTP_HOST'] . '?url=' . $sNewURL . '"';
            $sContent = str_replace($match, $sPlacement, $sContent);
        }

        preg_match_all('/ data-original=([\'"]).+?(\1)/', $sContent, $matches_original);

        foreach ($matches_original[0] as $match) {
            $url_original = trim(ltrim($match, ' data-orginal='), '"|\'');
            $sPlacement = ' data-original="http://' . $_SERVER['HTTP_HOST'] . '?url=' . $url_original . '"';
            $sContent = str_replace($match, $sPlacement, $sContent);
        }

        return $sContent;
    }

    private function sendHeader($sExt)
    {
        $aMineTypeList = [
            'js' => 'application/x-javascript',
            'css' => 'text/css',
            'jpg' => 'image/jpeg',
            'png' => 'image/png',
            'gif' => 'image/gif',
            'svg' => 'text/xml'
        ];

        $bReturn = false;

        if (isset($aMineTypeList[$sExt])) {
            header('Content-Type: ' . $aMineTypeList[$sExt]);
            $bReturn = true;
        }

        return $bReturn;
    }
 }

 (new Ladder)->main();

 # end of this file
	<?php

	namespace ladder;

	class Ladder
	{
	public function main()
	{
	$sURL = $this->getURL();

	if (empty($sURL)) {
	$this->showIndex();
	} else {
	$sContent = $this->getPage($sURL);
	$this->show($sContent, $sURL);
	}
	}

	private function showIndex()
	{
	echo <<<EOT
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>X-Ladder</title>
	</head>
	<body>
	<style>
	body {
	background-color: black;
	}
	#url {
	margin-top: 20%;
	padding: 10px;
	border: solid white 5px;
	font-size:30px;
	background-color: black;
	color: white;
	}
	</style>
	<center><input type="text" id="url" size=30></center>
	<script>
	(function(){
	var input = document.getElementById('url');
	input.focus();

	document.onkeydown = function(event){
	var e = event \|\| window.event \|\| arguments.callee.caller.arguments[0];

	if (e && e.keyCode == 13) {
	var url = input.value;

	if (url.substr(0, 4) !== 'http') {
	url = 'http://' + url;
	}

	location.href = '?url=' + url;
	}
	};

	})();
	</script>
	</body>
	</html>
	<!--
	EOT;
	}

	private function getURL()
	{
	return isset($_GET['url']) ? $_GET['url'] : '';
	}

	private function getPage($sURL)
	{
	return !empty($sURL) ? file_get_contents($sURL) : '';
	}

	private function show($sContent, $sURL)
	{
	$tmp = explode('.', $sURL);
	$ext = end($tmp);

	$bSendHeader = $this->sendHeader($ext);

	if (!$bSendHeader) {
	$sContent = str_replace('charset=GBK', 'charset=utf8', $sContent);
	$sContent = $this->processHTML($sContent, $sURL);
	}

	if (($pos = strpos($sURL, '?')) !== false) {
	$url = substr($sURL, 0, $pos);
	$tmp = explode('.', $url);
	$ext = end($tmp);

	$this->sendHeader($ext);
	}

	$sContent = gzencode($sContent, 9);
	header("Content-Encoding: gzip");
	header("Vary: Accept-Encoding");
	header("Content-Length: ".strlen($sContent));

	echo $sContent;
	echo "<!--";
	}

	private function processHTML($sContent, $sURL)
	{
	$aURLInfo = parse_url($sURL);
	preg_match_all('/ href=([\'"]).+?(\1)/', $sContent, $matches_href);

	foreach ($matches_href[0] as $match) {
	$url_href = trim(ltrim($match, ' href='), '"\|\'');

	if ($url_href{0} === '#') {
	continue;
	}

	$sNewURL = '';

	if ($url_href{0} === '/') {
	$sNewURL = $aURLInfo['scheme'] . '://' . $aURLInfo['host'] . $url_href;
	} else if (substr($url_href, 0, 4) === 'http') {
	$sNewURL = $url_href;
	} else {
	$sNewURL = $aURLInfo['scheme'] . '://' . $aURLInfo['host'] . '/' . $url_href;
	}

	if (!empty($sNewURL)) {
	$sPlacement = ' href="http://' . $_SERVER['HTTP_HOST'] . '?url=' . $sNewURL . '"';
	$sContent = str_replace($match, $sPlacement, $sContent);
	}
	}

	preg_match_all('/ src=([\'"]).+?(\1)/', $sContent, $matches_src);

	foreach ($matches_src[0] as $match) {
	$url_src = trim(ltrim($match, ' src='), '"\|\'');

	if (substr($url_src, 0, 2) === '//') {
	$sNewURL = $aURLInfo['scheme'] . ':' . $url_src;
	} else if ($url_src{0} === '/') {
	$sNewURL = $aURLInfo['scheme'] . '://' . $aURLInfo['host'] . $url_src;
	} else if (substr($url_src, 0, 4) === 'http') {
	$sNewURL = $url_src;
	} else {
	$sNewURL = $aURLInfo['scheme'] . '://' . $aURLInfo['host'] . '/' . $url_src;
	}

	$sPlacement = ' src="http://' . $_SERVER['HTTP_HOST'] . '?url=' . $sNewURL . '"';
	$sContent = str_replace($match, $sPlacement, $sContent);
	}

	preg_match_all('/ data-original=([\'"]).+?(\1)/', $sContent, $matches_original);

	foreach ($matches_original[0] as $match) {
	$url_original = trim(ltrim($match, ' data-orginal='), '"\|\'');
	$sPlacement = ' data-original="http://' . $_SERVER['HTTP_HOST'] . '?url=' . $url_original . '"';
	$sContent = str_replace($match, $sPlacement, $sContent);
	}

	return $sContent;
	}

	private function sendHeader($sExt)
	{
	$aMineTypeList = [
	'js' => 'application/x-javascript',
	'css' => 'text/css',
	'jpg' => 'image/jpeg',
	'png' => 'image/png',
	'gif' => 'image/gif',
	'svg' => 'text/xml'
	];

	$bReturn = false;

	if (isset($aMineTypeList[$sExt])) {
	header('Content-Type: ' . $aMineTypeList[$sExt]);
	$bReturn = true;
	}

	return $bReturn;
	}
	}

	(new Ladder)->main();

	# end of this file