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<?php
/**
* Cookie for HTTP requests.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup HTTP
*/
class Cookie {
protected $name;
protected $value;
protected $expires;
protected $path;
protected $domain;
protected $isSessionKey = true;
// TO IMPLEMENT protected $secure
// TO IMPLEMENT? protected $maxAge (add onto expires)
// TO IMPLEMENT? protected $version
// TO IMPLEMENT? protected $comment
function __construct( $name, $value, $attr ) {
$this->name = $name;
$this->set( $value, $attr );
}
/**
* Sets a cookie. Used before a request to set up any individual
* cookies. Used internally after a request to parse the
* Set-Cookie headers.
*
* @param string $value the value of the cookie
* @param array $attr possible key/values:
* expires A date string
* path The path this cookie is used on
* domain Domain this cookie is used on
* @throws MWException
*/
public function set( $value, $attr ) {
$this->value = $value;
if ( isset( $attr['expires'] ) ) {
$this->isSessionKey = false;
$this->expires = strtotime( $attr['expires'] );
}
if ( isset( $attr['path'] ) ) {
$this->path = $attr['path'];
} else {
$this->path = '/';
}
if ( isset( $attr['domain'] ) ) {
if ( self::validateCookieDomain( $attr['domain'] ) ) {
$this->domain = $attr['domain'];
}
} else {
throw new MWException( 'You must specify a domain.' );
}
}
/**
* Return the true if the cookie is valid is valid. Otherwise,
* false. The uses a method similar to IE cookie security
* described here:
* http://kuza55.blogspot.com/2008/02/understanding-cookie-security.html
* A better method might be to use a blacklist like
* http://publicsuffix.org/
*
* @todo fixme fails to detect 3-letter top-level domains
* @todo fixme fails to detect 2-letter top-level domains for single-domain use (probably not a big problem in practice, but there are test cases)
*
* @param string $domain the domain to validate
* @param string $originDomain (optional) the domain the cookie originates from
* @return Boolean
*/
public static function validateCookieDomain( $domain, $originDomain = null ) {
// Don't allow a trailing dot
if ( substr( $domain, -1 ) == '.' ) {
return false;
}
$dc = explode( ".", $domain );
// Only allow full, valid IP addresses
if ( preg_match( '/^[0-9.]+$/', $domain ) ) {
if ( count( $dc ) != 4 ) {
return false;
}
if ( ip2long( $domain ) === false ) {
return false;
}
if ( $originDomain == null || $originDomain == $domain ) {
return true;
}
}
// Don't allow cookies for "co.uk" or "gov.uk", etc, but allow "supermarket.uk"
if ( strrpos( $domain, "." ) - strlen( $domain ) == -3 ) {
if ( ( count( $dc ) == 2 && strlen( $dc[0] ) <= 2 )
|| ( count( $dc ) == 3 && strlen( $dc[0] ) == "" && strlen( $dc[1] ) <= 2 ) ) {
return false;
}
if ( ( count( $dc ) == 2 || ( count( $dc ) == 3 && $dc[0] == '' ) )
&& preg_match( '/(com|net|org|gov|edu)\...$/', $domain ) ) {
return false;
}
}
if ( $originDomain != null ) {
if ( substr( $domain, 0, 1 ) != '.' && $domain != $originDomain ) {
return false;
}
if ( substr( $domain, 0, 1 ) == '.'
&& substr_compare( $originDomain, $domain, -strlen( $domain ),
strlen( $domain ), true ) != 0 ) {
return false;
}
}
return true;
}
/**
* Serialize the cookie jar into a format useful for HTTP Request headers.
*
* @param string $path the path that will be used. Required.
* @param string $domain the domain that will be used. Required.
* @return String
*/
public function serializeToHttpRequest( $path, $domain ) {
$ret = '';
if ( $this->canServeDomain( $domain )
&& $this->canServePath( $path )
&& $this->isUnExpired() ) {
$ret = $this->name . '=' . $this->value;
}
return $ret;
}
/**
* @param $domain
* @return bool
*/
protected function canServeDomain( $domain ) {
if ( $domain == $this->domain
|| ( strlen( $domain ) > strlen( $this->domain )
&& substr( $this->domain, 0, 1 ) == '.'
&& substr_compare( $domain, $this->domain, -strlen( $this->domain ),
strlen( $this->domain ), true ) == 0 ) ) {
return true;
}
return false;
}
/**
* @param $path
* @return bool
*/
protected function canServePath( $path ) {
return ( $this->path && substr_compare( $this->path, $path, 0, strlen( $this->path ) ) == 0 );
}
/**
* @return bool
*/
protected function isUnExpired() {
return $this->isSessionKey || $this->expires > time();
}
}
class CookieJar {
private $cookie = array();
/**
* Set a cookie in the cookie jar. Make sure only one cookie per-name exists.
* @see Cookie::set()
*/
public function setCookie ( $name, $value, $attr ) {
/* cookies: case insensitive, so this should work.
* We'll still send the cookies back in the same case we got them, though.
*/
$index = strtoupper( $name );
if ( isset( $this->cookie[$index] ) ) {
$this->cookie[$index]->set( $value, $attr );
} else {
$this->cookie[$index] = new Cookie( $name, $value, $attr );
}
}
/**
* @see Cookie::serializeToHttpRequest
* @return string
*/
public function serializeToHttpRequest( $path, $domain ) {
$cookies = array();
foreach ( $this->cookie as $c ) {
$serialized = $c->serializeToHttpRequest( $path, $domain );
if ( $serialized ) {
$cookies[] = $serialized;
}
}
return implode( '; ', $cookies );
}
/**
* Parse the content of an Set-Cookie HTTP Response header.
*
* @param $cookie String
* @param string $domain cookie's domain
* @return null
*/
public function parseCookieResponseHeader ( $cookie, $domain ) {
$len = strlen( 'Set-Cookie:' );
if ( substr_compare( 'Set-Cookie:', $cookie, 0, $len, true ) === 0 ) {
$cookie = substr( $cookie, $len );
}
$bit = array_map( 'trim', explode( ';', $cookie ) );
if ( count( $bit ) >= 1 ) {
list( $name, $value ) = explode( '=', array_shift( $bit ), 2 );
$attr = array();
foreach ( $bit as $piece ) {
$parts = explode( '=', $piece );
if ( count( $parts ) > 1 ) {
$attr[strtolower( $parts[0] )] = $parts[1];
} else {
$attr[strtolower( $parts[0] )] = true;
}
}
if ( !isset( $attr['domain'] ) ) {
$attr['domain'] = $domain;
} elseif ( !Cookie::validateCookieDomain( $attr['domain'], $domain ) ) {
return null;
}
$this->setCookie( $name, $value, $attr );
}
}
}