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<?php
// +-----------------------------------------------------------------------+
// | Copyright (c) 2002-2004, Richard Heyes |
// | All rights reserved. |
// | |
// | Redistribution and use in source and binary forms, with or without |
// | modification, are permitted provided that the following conditions |
// | are met: |
// | |
// | o Redistributions of source code must retain the above copyright |
// | notice, this list of conditions and the following disclaimer. |
// | o Redistributions in binary form must reproduce the above copyright |
// | notice, this list of conditions and the following disclaimer in the |
// | documentation and/or other materials provided with the distribution.|
// | o The names of the authors may not be used to endorse or promote |
// | products derived from this software without specific prior written |
// | permission. |
// | |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
// | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
// | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
// | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
// | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
// | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
// | |
// +-----------------------------------------------------------------------+
// | Author: Richard Heyes <richard at php net> |
// +-----------------------------------------------------------------------+
//
// $Id$
//
// Net_URL Class

class Net_URL
{
    /**
* Full url
* @var string
*/
    var $url;

    /**
* Protocol
* @var string
*/
    var $protocol;

    /**
* Username
* @var string
*/
    var $username;

    /**
* Password
* @var string
*/
    var $password;

    /**
* Host
* @var string
*/
    var $host;

    /**
* Port
* @var integer
*/
    var $port;

    /**
* Path
* @var string
*/
    var $path;

    /**
* Query string
* @var array
*/
    var $querystring;

    /**
* Anchor
* @var string
*/
    var $anchor;

    /**
* Whether to use []
* @var bool
*/
    var $useBrackets;

    /**
* PHP4 Constructor
*
* @see __construct()
*/
    function Net_URL($url = null, $useBrackets = true)
    {
        $this->__construct($url, $useBrackets);
    }

    /**
* PHP5 Constructor
*
* Parses the given url and stores the various parts
* Defaults are used in certain cases
*
* @param string $url Optional URL
* @param bool $useBrackets Whether to use square brackets when
* multiple querystrings with the same name
* exist
*/
    function __construct($url = null, $useBrackets = true)
    {
        $HTTP_SERVER_VARS = !empty($_SERVER) ? $_SERVER : $GLOBALS['HTTP_SERVER_VARS'];

        $this->useBrackets = $useBrackets;
        $this->url = $url;
        $this->user = '';
        $this->pass = '';
        $this->host = '';
        $this->port = 80;
        $this->path = '';
        $this->querystring = array();
        $this->anchor = '';

        // Only use defaults if not an absolute URL given
        if (!preg_match('/^[a-z0-9]+:\/\//i', $url)) {

            $this->protocol = (@$HTTP_SERVER_VARS['HTTPS'] == 'on' ? 'https' : 'http');

            /**
* Figure out host/port
*/
            if (!empty($HTTP_SERVER_VARS['HTTP_HOST']) AND preg_match('/^(.*)(:([0-9]+))?$/U', $HTTP_SERVER_VARS['HTTP_HOST'], $matches)) {
                $host = $matches[1];
                if (!empty($matches[3])) {
                    $port = $matches[3];
                } else {
                    $port = $this->getStandardPort($this->protocol);
                }
            }

            $this->user = '';
            $this->pass = '';
            $this->host = !empty($host) ? $host : (isset($HTTP_SERVER_VARS['SERVER_NAME']) ? $HTTP_SERVER_VARS['SERVER_NAME'] : 'localhost');
            $this->port = !empty($port) ? $port : (isset($HTTP_SERVER_VARS['SERVER_PORT']) ? $HTTP_SERVER_VARS['SERVER_PORT'] : $this->getStandardPort($this->protocol));
            $this->path = !empty($HTTP_SERVER_VARS['PHP_SELF']) ? $HTTP_SERVER_VARS['PHP_SELF'] : '/';
            $this->querystring = isset($HTTP_SERVER_VARS['QUERY_STRING']) ? $this->_parseRawQuerystring($HTTP_SERVER_VARS['QUERY_STRING']) : null;
            $this->anchor = '';
        }

        // Parse the url and store the various parts
        if (!empty($url)) {
            $urlinfo = parse_url($url);

            // Default querystring
            $this->querystring = array();

            foreach ($urlinfo as $key => $value) {
                switch ($key) {
                    case 'scheme':
                        $this->protocol = $value;
                        $this->port = $this->getStandardPort($value);
                        break;

                    case 'user':
                    case 'pass':
                    case 'host':
                    case 'port':
                        $this->$key = $value;
                        break;

                    case 'path':
                        if ($value{0} == '/') {
                            $this->path = $value;
                        } else {
                            $path = dirname($this->path) == DIRECTORY_SEPARATOR ? '' : dirname($this->path);
                            $this->path = sprintf('%s/%s', $path, $value);
                        }
                        break;

                    case 'query':
                        $this->querystring = $this->_parseRawQueryString($value);
                        break;

                    case 'fragment':
                        $this->anchor = $value;
                        break;
                }
            }
        }
    }

    /**
* Returns full url
*
* @return string Full url
* @access public
*/
    function getURL()
    {
        $querystring = $this->getQueryString();

        $this->url = $this->protocol . '://'
                   . $this->user . (!empty($this->pass) ? ':' : '')
                   . $this->pass . (!empty($this->user) ? '@' : '')
                   . $this->host . ($this->port == $this->getStandardPort($this->protocol) ? '' : ':' . $this->port)
                   . $this->path
                   . (!empty($querystring) ? '?' . $querystring : '')
                   . (!empty($this->anchor) ? '#' . $this->anchor : '');

        return $this->url;
    }

    /**
* Adds a querystring item
*
* @param string $name Name of item
* @param string $value Value of item
* @param bool $preencoded Whether value is urlencoded or not, default = not
* @access public
*/
    function addQueryString($name, $value, $preencoded = false)
    {
        if ($preencoded) {
            $this->querystring[$name] = $value;
        } else {
            $this->querystring[$name] = is_array($value) ? array_map('rawurlencode', $value): rawurlencode($value);
        }
    }

    /**
* Removes a querystring item
*
* @param string $name Name of item
* @access public
*/
    function removeQueryString($name)
    {
        if (isset($this->querystring[$name])) {
            unset($this->querystring[$name]);
        }
    }

    /**
* Sets the querystring to literally what you supply
*
* @param string $querystring The querystring data. Should be of the format foo=bar&x=y etc
* @access public
*/
    function addRawQueryString($querystring)
    {
        $this->querystring = $this->_parseRawQueryString($querystring);
    }

    /**
* Returns flat querystring
*
* @return string Querystring
* @access public
*/
    function getQueryString()
    {
        if (!empty($this->querystring)) {
            foreach ($this->querystring as $name => $value) {
                if (is_array($value)) {
                    foreach ($value as $k => $v) {
                        $querystring[] = $this->useBrackets ? sprintf('%s[%s]=%s', $name, $k, $v) : ($name . '=' . $v);
                    }
                } elseif (!is_null($value)) {
                    $querystring[] = $name . '=' . $value;
                } else {
                    $querystring[] = $name;
                }
            }
            $querystring = implode(ini_get('arg_separator.output'), $querystring);
        } else {
            $querystring = '';
        }

        return $querystring;
    }

    /**
* Parses raw querystring and returns an array of it
*
* @param string $querystring The querystring to parse
* @return array An array of the querystring data
* @access private
*/
    function _parseRawQuerystring($querystring)
    {
        $parts = preg_split('/[' . preg_quote(ini_get('arg_separator.input'), '/') . ']/', $querystring, -1, PREG_SPLIT_NO_EMPTY);
        $return = array();

        foreach ($parts as $part) {
            if (strpos($part, '=') !== false) {
                $value = substr($part, strpos($part, '=') + 1);
                $key = substr($part, 0, strpos($part, '='));
            } else {
                $value = null;
                $key = $part;
            }
            if (substr($key, -2) == '[]') {
                $key = substr($key, 0, -2);
                if (@!is_array($return[$key])) {
                    $return[$key] = array();
                    $return[$key][] = $value;
                } else {
                    $return[$key][] = $value;
                }
            } elseif (!$this->useBrackets AND !empty($return[$key])) {
                $return[$key] = (array)$return[$key];
                $return[$key][] = $value;
            } else {
                $return[$key] = $value;
            }
        }

        return $return;
    }

    /**
* Resolves //, ../ and ./ from a path and returns
* the result. Eg:
*
* /foo/bar/../boo.php => /foo/boo.php
* /foo/bar/../../boo.php => /boo.php
* /foo/bar/.././/boo.php => /foo/boo.php
*
* This method can also be called statically.
*
* @param string $url URL path to resolve
* @return string The result
*/
    function resolvePath($path)
    {
        $path = explode('/', str_replace('//', '/', $path));

        for ($i=0; $i<count($path); $i++) {
            if ($path[$i] == '.') {
                unset($path[$i]);
                $path = array_values($path);
                $i--;

            } elseif ($path[$i] == '..' AND ($i > 1 OR ($i == 1 AND $path[0] != '') ) ) {
                unset($path[$i]);
                unset($path[$i-1]);
                $path = array_values($path);
                $i -= 2;

            } elseif ($path[$i] == '..' AND $i == 1 AND $path[0] == '') {
                unset($path[$i]);
                $path = array_values($path);
                $i--;

            } else {
                continue;
            }
        }

        return implode('/', $path);
    }

    /**
* Returns the standard port number for a protocol
*
* @param string $scheme The protocol to lookup
* @return integer Port number or NULL if no scheme matches
*
* @author Philippe Jausions <Philippe.Jausions@11abacus.com>
*/
    function getStandardPort($scheme)
    {
        switch (strtolower($scheme)) {
            case 'http': return 80;
            case 'https': return 443;
            case 'ftp': return 21;
            case 'imap': return 143;
            case 'imaps': return 993;
            case 'pop3': return 110;
            case 'pop3s': return 995;
            default: return null;
       }
    }

    /**
* Forces the URL to a particular protocol
*
* @param string $protocol Protocol to force the URL to
* @param integer $port Optional port (standard port is used by default)
*/
    function setProtocol($protocol, $port = null)
    {
        $this->protocol = $protocol;
        $this->port = is_null($port) ? $this->getStandardPort() : $port;
    }

}
?>
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