<?php

error_reporting(E_ALL);
ini_set('display_errors', 1);

const WEBSITE_SCHEME = 'https';
const WEBSITE_HOST = 'esantu.com';

$username = 'pa-2502-ad-s2';

function toKebabCase(string $str)
{
    return preg_replace('/\. /', '-', ucwords(preg_replace('/_/', '. ', strtolower($str))));
}

$path = dirname($_SERVER["SCRIPT_NAME"]);
$urlPath = $_SERVER['REQUEST_URI'];
if (rtrim($urlPath, "/") == $path) {
    $urlFile = '';
    $urlTarget = WEBSITE_SCHEME.'://'.WEBSITE_HOST."/$username/$urlFile";
}
else if (preg_match('/\/(contents\/(.*)\/([pd])([0-9]+)_?(.*)\.html)/', $urlPath, $urlParts)) {
    $lang = $urlParts[2];
    $type = $urlParts[3];
    $sfidNumber = $urlParts[4];
    $urlFile = $urlParts[5] ? $urlParts[5] : $urlParts[3].$urlParts[4];
    $urlTarget = WEBSITE_SCHEME.'://'.WEBSITE_HOST."/$username/$urlParts[1]";
}
else if (strpos($urlPath, $path) === 0) {
    $urlFile = substr($urlPath, strlen($path) + 1);
    if (strstr($urlFile, '/') >= 0) {
        $urlTarget = WEBSITE_SCHEME.'://'.WEBSITE_HOST."/$username/$urlFile";
    }
    else {
        $urlTarget = WEBSITE_SCHEME.'://'.WEBSITE_HOST."/$urlFile";
    }
}

$referer = $_SERVER["HTTP_REFERER"] ?? $_SERVER["REQUEST_SCHEME"].'://'.$_SERVER["SERVER_NAME"].$path;
$sessionId = isset($_COOKIE['PHPSESSID'])
    ? $_COOKIE['PHPSESSID']
    : sha1(sprintf("%.15s%ld%ld%0.8F", $referer, time(), microtime(), lcg_value() * 10));
$isPost = $_SERVER["REQUEST_METHOD"] === 'POST';

$headers = "Cookie: PHPSESSID=$sessionId\r\n";
foreach ($_SERVER as $key => $value) {
    if (strpos($key, 'HTTP_X') === 0 || strpos($key, 'HTTP_HX') === 0) {
        $headerName = toKebabCase(substr($key, 5));
        $headers .= "$headerName: $value\r\n";
    }
    elseif (strpos($key, 'CONTENT_') === 0) {
        $headerName = toKebabCase($key);
        $headers .= "$headerName: $value\r\n";
    }
}
$http = [
    'http' => [
        'method' => $_SERVER["REQUEST_METHOD"],
        'header' => $headers,
    ]
];
if ($isPost) {
    function mapper($k, $v) { return "$k=$v"; }
    $http['http']['content'] = implode('&', array_map('mapper', array_keys($_POST), array_values($_POST)));
}

$context = stream_context_create($http);
$response = file_get_contents($urlTarget, false, $context);

if (isset($http_response_header)) {
    // Pass headers to output
    foreach ($http_response_header as $header) {
        $headerParts = preg_split('/:\s+/', $header, 2);

        $headerName = $headerParts[0];
        $loweredHeaderName = strtolower($headerName);
        if (isset($headerParts[1])) {
            $headerValue = $headerParts[1];
            $loweredHeaderValue = strtolower($headerValue);
        }

        if (strpos($loweredHeaderName, ' 301 ') !== false) {
            header($headerName, true);
        }
        elseif ($loweredHeaderName === 'location'
            || strpos($loweredHeaderName, 'x-') === 0
            || strpos($loweredHeaderName, 'hx-') === 0) {
            $newValue = preg_replace('/^.*\/\/'.WEBSITE_HOST.'\/'.$username.'/', $referer, $headerValue);
            header("$headerName: $newValue", true);
        }
        elseif (in_array($loweredHeaderName, ['content-type', 'content-language', 'content-security', 'content-length', 'server'])) {
            // Pass following headers to response
            header("$headerName: $headerValue", true);
        }
        elseif ($loweredHeaderName === 'set-cookie') {
            // Replace cookie domain and path
            $newValue = preg_replace('/((?>domain)\s*=\s*)[^;\s]+/', '\1.' . $_SERVER['HTTP_HOST'], $headerValue);
            $newValue = preg_replace('/\s*;?\s*path\s*=\s*[^;\s]+/', '', $newValue);
            header("$headerName: $newValue", true);
        }
        /*elseif ($loweredHeaderName === 'content-encoding' && $loweredHeaderValue === 'gzip') {
            // Decode response body if gzip encoding is used
            $response = gzdecode($response);
        }*/
    }
}

$response = preg_replace('/(href|src|action)=([\'"]?)\/(?:'.$username.'\/?)?/', '$1=$2'.$path.'/', $response);
$response = preg_replace('/https?:\\\\?\/\\\\?\/'.WEBSITE_HOST.'\\\\?\/'.$username.'/', $referer, $response);
echo $response;