class.ilHttpRequest.php

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<?php
/*
+-----------------------------------------------------------------------------+
| ILIAS open source                                                           |
+-----------------------------------------------------------------------------+
| Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
|                                                                             |
| This program is free software; you can redistribute it and/or               |
| modify it under the terms of the GNU General Public License                 |
| as published by the Free Software Foundation; either version 2              |
| of the License, or (at your option) any later version.                      |
|                                                                             |
| This program is distributed in the hope that it will be useful,             |
| but WITHOUT ANY WARRANTY; without even the implied warranty of              |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
| GNU General Public License for more details.                                |
|                                                                             |
| You should have received a copy of the GNU General Public License           |
| along with this program; if not, write to the Free Software                 |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
+-----------------------------------------------------------------------------+
*/
 
class ilHttpRequest
{
    public $_fp;        // HTTP socket
    public $_url;        // full URL
    public $_host;        // HTTP host
    public $_protocol;    // protocol (HTTP/HTTPS)
    public $_uri;        // request URI
    public $_port;        // port
    
    // scan url
    public function _scan_url()
    {
        $req = $this->_url;
        
        $pos = strpos($req, '://');
        $this->_protocol = strtolower(substr($req, 0, $pos));
        
        $req = substr($req, $pos+3);
        $pos = strpos($req, '/');
        if ($pos === false) {
            $pos = strlen($req);
        }
        $host = substr($req, 0, $pos);
        
        if (strpos($host, ':') !== false) {
            list($this->_host, $this->_port) = explode(':', $host);
        } else {
            $this->_host = $host;
            $this->_port = ($this->_protocol == 'https') ? 443 : 80;
        }
        
        $this->_uri = substr($req, $pos);
        if ($this->_uri == '') {
            $this->_uri = '/';
        }
    }
    
    // constructor
    public function __construct($url)
    {
        $this->_url = $url;
        $this->_scan_url();
    }
    
    // download URL to string
    public function downloadToString()
    {
        $crlf = "\r\n";
        
        // generate request
        $req = 'GET ' . $this->_uri . ' HTTP/1.0' . $crlf
        . 'Host: ' . $this->_host . $crlf
        . $crlf;
 
        // fetch
        $this->_fp = fsockopen(($this->_protocol == 'https' ? 'ssl://' : '') . $this->_host, $this->_port);
        fwrite($this->_fp, $req);
        while (is_resource($this->_fp) && $this->_fp && !feof($this->_fp)) {
            $response .= fread($this->_fp, 1024);
        }
        fclose($this->_fp);
        
        // split header and body
        $pos = strpos($response, $crlf . $crlf);
        if ($pos === false) {
            return($response);
        }
        $header = substr($response, 0, $pos);
        $body = substr($response, $pos + 2 * strlen($crlf));
        
        // parse headers
        $headers = array();
        $lines = explode($crlf, $header);
        foreach ($lines as $line) {
            if (($pos = strpos($line, ':')) !== false) {
                $headers[strtolower(trim(substr($line, 0, $pos)))] = trim(substr($line, $pos+1));
            }
        }
        
        // redirection?
        if (isset($headers['location'])) {
            $http = new ilHttpRequest($headers['location']);
            return($http->DownloadToString($http));
        } else {
            return($body);
        }
    }
}