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
{
        var $_fp;        // HTTP socket
        var $_url;        // full URL
        var $_host;        // HTTP host
        var $_protocol;    // protocol (HTTP/HTTPS)
        var $_uri;        // request URI
        var $_port;        // port
        
        // scan url
        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
        function ilHttpRequest($url)
        {
                $this->_url = $url;
                $this->_scan_url();
        }
        
        // download URL to string
        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);
                }
        }
}
?>