MDL-15476

[moodle-linuxchix.git] / lib / simpletestlib / cookies.php

<?php
    /**
     *  Base include file for SimpleTest
     *  @package        SimpleTest
     *  @subpackage     WebTester
     *  @version        $Id$
     */

    /**#@+
     *  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;
        }
    }
?>