<?php
/**
 *  Base include file for SimpleTest
 *  @package    SimpleTest
 *  @subpackage WebTester
 *  @version    $Id: cookies.php,v 1.4 2010/12/14 17:35:44 moodlerobot Exp $
 */

/**#@+
 *  include other SimpleTest class files
 */
require_once(dirname(__FILE__) . '/url.php');
/**#@-*/

/**
 *    Cookie data holder. Cookie rules are full of pretty
 *    arbitary stuff. I have used...
 *    http://wp.netscape.com/newsref/std/cookie_spec.html
 *    http://www.cookiecentral.com/faq/
 *    @package SimpleTest
 *    @subpackage WebTester
 */
class SimpleCookie {
    var $_host;
    var $_name;
    var $_value;
    var $_path;
    var $_expiry;
    var $_is_secure;
    
    /**
     *    Constructor. Sets the stored values.
     *    @param string $name            Cookie key.
     *    @param string $value           Value of cookie.
     *    @param string $path            Cookie path if not host wide.
     *    @param string $expiry          Expiry date as string.
     *    @param boolean $is_secure      Currently ignored.
     */
    function SimpleCookie($name, $value = false, $path = false, $expiry = false, $is_secure = false) {
        $this->_host = false;
        $this->_name = $name;
        $this->_value = $value;
        $this->_path = ($path ? $this->_fixPath($path) : "/");
        $this->_expiry = false;
        if (is_string($expiry)) {
            $this->_expiry = strtotime($expiry);
        } elseif (is_integer($expiry)) {
            $this->_expiry = $expiry;
        }
        $this->_is_secure = $is_secure;
    }
    
    /**
     *    Sets the host. The cookie rules determine
     *    that the first two parts are taken for
     *    certain TLDs and three for others. If the
     *    new host does not match these rules then the
     *    call will fail.
     *    @param string $host       New hostname.
     *    @return boolean           True if hostname is valid.
     *    @access public
     */
    function setHost($host) {
        if ($host = $this->_truncateHost($host)) {
            $this->_host = $host;
            return true;
        }
        return false;
    }
    
    /**
     *    Accessor for the truncated host to which this
     *    cookie applies.
     *    @return string       Truncated hostname.
     *    @access public
     */
    function getHost() {
        return $this->_host;
    }
    
    /**
     *    Test for a cookie being valid for a host name.
     *    @param string $host    Host to test against.
     *    @return boolean        True if the cookie would be valid
     *                           here.
     */
    function isValidHost($host) {
        return ($this->_truncateHost($host) === $this->getHost());
    }
    
    /**
     *    Extracts just the domain part that determines a
     *    cookie's host validity.
     *    @param string $host    Host name to truncate.
     *    @return string        Domain or false on a bad host.
     *    @access private
     */
    function _truncateHost($host) {
        $tlds = SimpleUrl::getAllTopLevelDomains();
        if (preg_match('/[a-z\-]+\.(' . $tlds . ')$/i', $host, $matches)) {
            return $matches[0];
        } elseif (preg_match('/[a-z\-]+\.[a-z\-]+\.[a-z\-]+$/i', $host, $matches)) {
            return $matches[0];
        }
        return false;
    }
    
    /**
     *    Accessor for name.
     *    @return string       Cookie key.
     *    @access public
     */
    function getName() {
        return $this->_name;
    }
    
    /**
     *    Accessor for value. A deleted cookie will
     *    have an empty string for this.
     *    @return string       Cookie value.
     *    @access public
     */
    function getValue() {
        return $this->_value;
    }
    
    /**
     *    Accessor for path.
     *    @return string       Valid cookie path.
     *    @access public
     */
    function getPath() {
        return $this->_path;
    }
    
    /**
     *    Tests a path to see if the cookie applies
     *    there. The test path must be longer or
     *    equal to the cookie path.
     *    @param string $path       Path to test against.
     *    @return boolean           True if cookie valid here.
     *    @access public
     */
    function isValidPath($path) {
        return (strncmp(
                $this->_fixPath($path),
                $this->getPath(),
                strlen($this->getPath())) == 0);
    }
    
    /**
     *    Accessor for expiry.
     *    @return string       Expiry string.
     *    @access public
     */
    function getExpiry() {
        if (! $this->_expiry) {
            return false;
        }
        return gmdate("D, d M Y H:i:s", $this->_expiry) . " GMT";
    }
    
    /**
     *    Test to see if cookie is expired against
     *    the cookie format time or timestamp.
     *    Will give true for a session cookie.
     *    @param integer/string $now  Time to test against. Result
     *                                will be false if this time
     *                                is later than the cookie expiry.
     *                                Can be either a timestamp integer
     *                                or a cookie format date.
     *    @access public
     */
    function isExpired($now) {
        if (! $this->_expiry) {
            return true;
        }
        if (is_string($now)) {
            $now = strtotime($now);
        }
        return ($this->_expiry < $now);
    }
    
    /**
     *    Ages the cookie by the specified number of
     *    seconds.
     *    @param integer $interval   In seconds.
     *    @public
     */
    function agePrematurely($interval) {
        if ($this->_expiry) {
            $this->_expiry -= $interval;
        }
    }
    
    /**
     *    Accessor for the secure flag.
     *    @return boolean       True if cookie needs SSL.
     *    @access public
     */
    function isSecure() {
        return $this->_is_secure;
    }
    
    /**
     *    Adds a trailing and leading slash to the path
     *    if missing.
     *    @param string $path            Path to fix.
     *    @access private
     */
    function _fixPath($path) {
        if (substr($path, 0, 1) != '/') {
            $path = '/' . $path;
        }
        if (substr($path, -1, 1) != '/') {
            $path .= '/';
        }
        return $path;
    }
}

/**
 *    Repository for cookies. This stuff is a
 *    tiny bit browser dependent.
 *    @package SimpleTest
 *    @subpackage WebTester
 */
class SimpleCookieJar {
    var $_cookies;
    
    /**
     *    Constructor. Jar starts empty.
     *    @access public
     */
    function SimpleCookieJar() {
        $this->_cookies = array();
    }
    
    /**
     *    Removes expired and temporary cookies as if
     *    the browser was closed and re-opened.
     *    @param string/integer $now   Time to test expiry against.
     *    @access public
     */
    function restartSession($date = false) {
        $surviving_cookies = array();
        for ($i = 0; $i < count($this->_cookies); $i++) {
            if (! $this->_cookies[$i]->getValue()) {
                continue;
            }
            if (! $this->_cookies[$i]->getExpiry()) {
                continue;
            }
            if ($date && $this->_cookies[$i]->isExpired($date)) {
                continue;
            }
            $surviving_cookies[] = $this->_cookies[$i];
        }
        $this->_cookies = $surviving_cookies;
    }
    
    /**
     *    Ages all cookies in the cookie jar.
     *    @param integer $interval     The old session is moved
     *                                 into the past by this number
     *                                 of seconds. Cookies now over
     *                                 age will be removed.
     *    @access public
     */
    function agePrematurely($interval) {
        for ($i = 0; $i < count($this->_cookies); $i++) {
            $this->_cookies[$i]->agePrematurely($interval);
        }
    }
    
    /**
     *    Sets an additional cookie. If a cookie has
     *    the same name and path it is replaced.
     *    @param string $name       Cookie key.
     *    @param string $value      Value of cookie.
     *    @param string $host       Host upon which the cookie is valid.
     *    @param string $path       Cookie path if not host wide.
     *    @param string $expiry     Expiry date.
     *    @access public
     */
    function setCookie($name, $value, $host = false, $path = '/', $expiry = false) {
        $cookie = new SimpleCookie($name, $value, $path, $expiry);
        if ($host) {
            $cookie->setHost($host);
        }
        $this->_cookies[$this->_findFirstMatch($cookie)] = $cookie;
    }
    
    /**
     *    Finds a matching cookie to write over or the
     *    first empty slot if none.
     *    @param SimpleCookie $cookie    Cookie to write into jar.
     *    @return integer                Available slot.
     *    @access private
     */
    function _findFirstMatch($cookie) {
        for ($i = 0; $i < count($this->_cookies); $i++) {
            $is_match = $this->_isMatch(
                    $cookie,
                    $this->_cookies[$i]->getHost(),
                    $this->_cookies[$i]->getPath(),
                    $this->_cookies[$i]->getName());
            if ($is_match) {
                return $i;
            }
        }
        return count($this->_cookies);
    }
    
    /**
     *    Reads the most specific cookie value from the
     *    browser cookies. Looks for the longest path that
     *    matches.
     *    @param string $host        Host to search.
     *    @param string $path        Applicable path.
     *    @param string $name        Name of cookie to read.
     *    @return string             False if not present, else the
     *                               value as a string.
     *    @access public
     */
    function getCookieValue($host, $path, $name) {
        $longest_path = '';
        foreach ($this->_cookies as $cookie) {
            if ($this->_isMatch($cookie, $host, $path, $name)) {
                if (strlen($cookie->getPath()) > strlen($longest_path)) {
                    $value = $cookie->getValue();
                    $longest_path = $cookie->getPath();
                }
            }
        }
        return (isset($value) ? $value : false);
    }
    
    /**
     *    Tests cookie for matching against search
     *    criteria.
     *    @param SimpleTest $cookie    Cookie to test.
     *    @param string $host          Host must match.
     *    @param string $path          Cookie path must be shorter than
     *                                 this path.
     *    @param string $name          Name must match.
     *    @return boolean              True if matched.
     *    @access private
     */
    function _isMatch($cookie, $host, $path, $name) {
        if ($cookie->getName() != $name) {
            return false;
        }
        if ($host && $cookie->getHost() && ! $cookie->isValidHost($host)) {
            return false;
        }
        if (! $cookie->isValidPath($path)) {
            return false;
        }
        return true;
    }
    
    /**
     *    Uses a URL to sift relevant cookies by host and
     *    path. Results are list of strings of form "name=value".
     *    @param SimpleUrl $url       Url to select by.
     *    @return array               Valid name and value pairs.
     *    @access public
     */
    function selectAsPairs($url) {
        $pairs = array();
        foreach ($this->_cookies as $cookie) {
            if ($this->_isMatch($cookie, $url->getHost(), $url->getPath(), $cookie->getName())) {
                $pairs[] = $cookie->getName() . '=' . $cookie->getValue();
            }
        }
        return $pairs;
    }
}
?>