Wat devven we vandaag? Deel 4

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<?php
session_start();

define("_THEPIRATEBAY_", "thepiratebay.se");

class BayProxy {
    private $content_headers = array (
        "jpg" => "image/jpg",
        "png" => "image/png",
        "gif" => "image/gif",
        "css" => "text/css",
        "xml" => "application/opensearchdescription+xml",
        "js" => "text/javascript",
        "torrent" => "application/x-bittorrent"
    );
    private $fqdn;

    function __construct() {
    }

    function run() {
        if (isset ($_GET["p"])) {
            if (!$this->isFile($_GET["p"])) {
                $this->fqdn = $this->getFQDN($_GET["p"]);
                $_SESSION["fqdn"] = $this->fqdn;
                print ("<html>" . $this->getParsedHTML($this->getData($_GET["p"])) . "</html>");
            } else {
                $this->getFile($_GET["p"]);
            }
        } else {
            if (isset ($_GET["q"]) && isset ($_SESSION["fqdn"])) {
                $parsed_url = parse_url($_GET["q"]);
                $this->fqdn = !array_key_exists("host", $parsed_url) ? $_SESSION["fqdn"] : $parsed_url["host"];
                print ("<html>" . $this->getParsedHTML($this->getData($this->fqdn . "/search/" . $_GET["q"])) . "</html>");
            } else {
                header("Location: " . $_SERVER["PHP_SELF"] . "?p=" . _THEPIRATEBAY_);
            }
        }
    }

    private function getScheme($url) {
        $parsed = parse_url($url);
        if (!array_key_exists("scheme", $parsed)) {
            return "http://";
        } else {
            return "";
        }
    }

    private function getFile($url) {
        preg_match("/\.(" . $this->getExtensions() . ")$/i", $url, $matches);
        if (count($matches) >= 1) {
            $fp = fopen($this->getScheme($url) . $url, "rb");
            header("Content-Type: " . $this->content_headers[$matches[1]]);
            fpassthru($fp);
            exit;
        }
    }

    private function isHost($host) {
        return count(explode(".", $host)) > 1 && !preg_match("/php|html|htm|asp|aspx/i", $host);
    }

    private function getParsedHTMLCallback($matches) {
        $match = $matches[3];
        do {
            $match = trim($match, "/");
        } while (preg_match("/^\/\/$/i", $match));
        $host = $this->getHost($match);
        if ($this->isHost($host)) {
            if (preg_match("/" . $this->getHost($this->fqdn) . "/i", $host)) {
                return $matches[1] . '="' . $_SERVER["PHP_SELF"] . '?p=' . $match . '"';
            } else {
                return $matches[1] . '="' . $match . '"';
            }
        } else {
            return $matches[1] . '="' . $_SERVER["PHP_SELF"] . '?p=' . $this->fqdn . '/' . $match . '"';
        }
    }

    private function getParsedHTML($data) {
        return preg_replace_callback('/(href|src|action)=("|\')((http:\/\/|https:\/\/)?([a-z0-9\.-]+)?(:[0-9]+)?[a-z0-9\._\/\-\?\=%&\[\]\+\!]+)("|\')/i', array (
            $this,
            "getParsedHTMLCallback"
        ), $data);
    }

    private function getData($url) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_USERAGENT, "Opera/9.23 (Windows NT 5.1; U; en)");
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }

    private function getFQDN($url) {
        preg_match("/^(http:\/\/|https:\/\/)?([a-z0-9\._-]+(:[0-9]+)?)\/?/i", $url, $matches);
        if (count($matches) >= 2) {
            return $matches[2];
        }
        die("Whoops, something went wrong. Please try again.");
    }

    private function getHost($url) {
        $host = "";
        preg_match("/^(http:\/|https:\/)?(\/+)?([a-z0-9\.-]+)?(:[0-9]+)?\/?/i", $url, $matches);
        if (count($matches) >= 3) {
            $host = $matches[3];
            if (count(explode(".", $host)) > 2) {
                preg_match("/([a-z0-9-]+)\.([a-z]{2,}|\.[a-z]{2,}\.[a-z]{2,})$/i", $host, $matches);
                if (count($matches) >= 1) {
                    $host = $matches[0];
                }
            } else {
                $host = $matches[3];
            }
        }
        return $host;
    }

    private function getExtensionsCallback($value) {
        return $value . "|";
    }

    private function getExtensions() {
        return trim(implode(array_map(array (
            $this,
            "getExtensionsCallback"
        ), array_keys($this->content_headers))), "|");
    }

    private function isFile($url) {
        return preg_match("/^(http:\/\/|https:\/\/)?[a-z0-9\.-]+(:[0-9]+)?[a-z0-9\._\/\-\?\=%&\[\]\+\!]+\.(" . $this->getExtensions() . ")$/i", $url);
    }
}
?>
<?php

$proxy = new BayProxy();
$proxy->run();
?>