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<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [e-mail] so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Uri
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

/**
 * Zend_Uri base class
 */
require_once 'Zend/Uri.php';

/**
 * Zend_Filter
 */
require_once 'Zend/Validate/Hostname.php';

/**
 * @category   Zend
 * @package    Zend_Uri
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Uri_Http extends Zend_Uri
{
    /**
     * URI parts are divided among these instance variables
     */
	protected $_username	= '';
	protected $_password	= '';
	protected $_host		= '';
	protected $_port        = '';
	protected $_path 		= '';
	protected $_query		= '';
	protected $_fragment 	= '';

	/**
	 * Regular expression grammar rules for validation; values added by constructor
	 */
	protected $_regex = array();

	/**
	 * Constructor accepts a string $scheme (e.g., http, https) and a scheme-specific part of the URI
	 * (e.g., example.com/path/to/resource?query=param#fragment)
	 *
	 * @param string $scheme
	 * @param string $schemeSpecific
	 * @throws Zend_Uri_Exception
	 * @return void
	 */
    protected function __construct($scheme, $schemeSpecific = '')
    {
        // Set the scheme
        $this->_scheme = $scheme;

        // Set up grammar rules for validation via regular expressions. These
        // are to be used with slash-delimited regular expression strings.
        $this->_regex['alphanum']   = '[^\W_]';
        $this->_regex['escaped']    = '(?:%[\da-fA-F]{2})';
        $this->_regex['mark']       = '[-_.!~*\'()]';
        $this->_regex['reserved']   = '[;\/?:@&=+$,]';
        $this->_regex['unreserved'] = '(?:' . $this->_regex['alphanum'] . '|' . $this->_regex['mark'] . ')';
        $this->_regex['segment']    = '(?:(?:' . $this->_regex['unreserved'] . '|' . $this->_regex['escaped']
                                    . '|[:@&=+$,;])*)';
        $this->_regex['path']       = '(?:\/' . $this->_regex['segment'] . ')+';
        $this->_regex['uric']       = '(?:' . $this->_regex['reserved'] . '|' . $this->_regex['unreserved'] . '|'
                                    . $this->_regex['escaped'] . ')';
        // If no scheme-specific part was supplied, the user intends to create
        // a new URI with this object.  No further parsing is required.
        if (strlen($schemeSpecific) == 0) {
            return;
        }

        // Parse the scheme-specific URI parts into the instance variables.
        $this->_parseUri($schemeSpecific);

        // Validate the URI
        if (!$this->valid()) {
            throw new Zend_Uri_Exception('Invalid URI supplied');
        }
    }

    /**
     * Parse the scheme-specific portion of the URI and place its parts into instance variables.
     *
     * @param string $schemeSpecific
     * @throws Zend_Uri_Exception
     * @return void
     */
    protected function _parseUri($schemeSpecific)
    {
        // High-level decomposition parser
        $pattern = '~^((//)([^/?#]*))([^?#]*)(\?([^#]*))?(#(.*))?$~';
        $status = @preg_match($pattern, $schemeSpecific, $matches);
        if ($status === false) {
            throw new Zend_Uri_Exception('Internal error: scheme-specific decomposition failed');
        }

        // Failed decomposition; no further processing needed
        if (!$status) {
            return;
        }

        // Save URI components that need no further decomposition
        $this->_path     = isset($matches[4]) ? $matches[4] : '';
        $this->_query    = isset($matches[6]) ? $matches[6] : '';
        $this->_fragment = isset($matches[8]) ? $matches[8] : '';

        // Additional decomposition to get username, password, host, and port
        $combo = isset($matches[3]) ? $matches[3] : '';
        $pattern = '~^(([^:@]*)(:([^@]*))?@)?([^:]+)(:(.*))?$~';
        $status = @preg_match($pattern, $combo, $matches);
        if ($status === false) {
            throw new Zend_Uri_Exception('Internal error: authority decomposition failed');
        }

        // Failed decomposition; no further processing needed
        if (!$status) {
            return;
        }

        // Save remaining URI components
        $this->_username = isset($matches[2]) ? $matches[2] : '';
        $this->_password = isset($matches[4]) ? $matches[4] : '';
        $this->_host     = isset($matches[5]) ? $matches[5] : '';
        $this->_port     = isset($matches[7]) ? $matches[7] : '';

    }

    /**
     * Returns a URI based on current values of the instance variables. If any
     * part of the URI does not pass validation, then an exception is thrown.
     *
     * @throws Zend_Uri_Exception
     * @return string
     */
    public function getUri()
    {
        if (!$this->valid()) {
            throw new Zend_Uri_Exception('One or more parts of the URI are invalid');
        }
        $password = strlen($this->_password) ? ":$this->_password" : '';
        $auth = strlen($this->_username) ? "$this->_username$password@" : '';
        $port = strlen($this->_port) ? ":$this->_port" : '';
        $query = strlen($this->_query) ? "?$this->_query" : '';
        $fragment = strlen($this->_fragment) ? "#$this->_fragment" : '';
        return "$this->_scheme://$auth$this->_host$port$this->_path$query$fragment";
    }

    /**
     * Validate the current URI from the instance variables. Returns true if and only if all
     * parts pass validation.
     *
     * @return boolean
     */
    public function valid()
    {
        /**
         * Return true if and only if all parts of the URI have passed validation
         */
        return $this->validateUsername()
            && $this->validatePassword()
            && $this->validateHost()
            && $this->validatePort()
            && $this->validatePath()
            && $this->validateQuery()
            && $this->validateFragment();
    }

	/**
	 * Returns the username portion of the URL, or FALSE if none.
	 *
	 * @return string
	 */
	public function getUsername()
	{
		return strlen($this->_username) ? $this->_username : false;
	}

	/**
	 * Returns true if and only if the username passes validation. If no username is passed,
	 * then the username contained in the instance variable is used.
	 *
	 * @param string $username
	 * @throws Zend_Uri_Exception
	 * @return boolean
	 */
    public function validateUsername($username = null)
    {
        if ($username === null) {
            $username = $this->_username;
        }

        // If the username is empty, then it is considered valid
        if (strlen($username) == 0) {
            return true;
        }
        /**
         * Check the username against the allowed values
         *
         * @link http://www.faqs.org/rfcs/rfc2396.html
         */
        $status = @preg_match('/^(' . $this->_regex['alphanum']  . '|' . $this->_regex['mark'] . '|'
                            . $this->_regex['escaped'] . '|[;:&=+$,])+$/', $username);
        if ($status === false) {
            throw new Zend_Uri_Exception('Internal error: username validation failed');
        }
        
        return $status == 1;
    }

    /**
     * Sets the username for the current URI, and returns the old username
     *
     * @param string $username
     * @throws Zend_Uri_Exception
     * @return string
     */
    public function setUsername($username)
    {
        if (!$this->validateUsername($username)) {
            throw new Zend_Uri_Exception("Username \"$username\" is not a valid HTTP username");
        }
        $oldUsername = $this->_username;
        $this->_username = $username;
        return $oldUsername;
    }

	/**
	 * Returns the password portion of the URL, or FALSE if none.
	 *
	 * @return string
	 */
	public function getPassword()
	{
		return strlen($this->_password) ? $this->_password : false;
	}

	/**
	 * Returns true if and only if the password passes validation. If no password is passed,
	 * then the password contained in the instance variable is used.
	 *
	 * @param string $password
	 * @throws Zend_Uri_Exception
	 * @return boolean
	 */
    public function validatePassword($password = null)
    {
        if ($password === null) {
            $password = $this->_password;
        }
        
        // If the password is empty, then it is considered valid
        if (strlen($password) == 0) {
            return true;
        }

        // If the password is nonempty, but there is no username, then it is considered invalid
        if (strlen($password) > 0 && strlen($this->_username) == 0) {
            return false;
        }
        
        /**
         * Check the password against the allowed values
         *
         * @link http://www.faqs.org/rfcs/rfc2396.html
         */
        $status = @preg_match('/^(' . $this->_regex['alphanum']  . '|' . $this->_regex['mark'] . '|'
                             . $this->_regex['escaped'] . '|[;:&=+$,])+$/', $password);
        if ($status === false) {
            throw new Zend_Uri_Exception('Internal error: password validation failed.');
        }
        return $status == 1;
    }

    /**
     * Sets the password for the current URI, and returns the old password
     *
     * @param string $password
     * @throws Zend_Uri_Exception
     * @return string
     */
    public function setPassword($password)
    {
        if (!$this->validatePassword($password)) {
            throw new Zend_Uri_Exception("Password \"$password\" is not a valid HTTP password.");
        }
        $oldPassword = $this->_password;
        $this->_password = $password;
        return $oldPassword;
    }

	/**
	 * Returns the domain or host IP portion of the URL, or FALSE if none.
	 *
	 * @return string
	 */
	public function getHost()
	{