includes/libs/Cookie.php

   1 <?php
   2 /**
   3  * Cookie for HTTP requests.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup HTTP
  22  */
  23
  24 class Cookie {
  25         protected $name;
  26         protected $value;
  27         protected $expires;
  28         protected $path;
  29         protected $domain;
  30         protected $isSessionKey = true;
  31         // TO IMPLEMENT  protected $secure
  32         // TO IMPLEMENT? protected $maxAge (add onto expires)
  33         // TO IMPLEMENT? protected $version
  34         // TO IMPLEMENT? protected $comment
  35
  36         function __construct( $name, $value, $attr ) {
  37                 $this->name = $name;
  38                 $this->set( $value, $attr );
  39         }
  40
  41         /**
  42          * Sets a cookie.  Used before a request to set up any individual
  43          * cookies. Used internally after a request to parse the
  44          * Set-Cookie headers.
  45          *
  46          * @param string $value The value of the cookie
  47          * @param array $attr Possible key/values:
  48          *        expires A date string
  49          *        path    The path this cookie is used on
  50          *        domain  Domain this cookie is used on
  51          * @throws InvalidArgumentException
  52          */
  53         public function set( $value, $attr ) {
  54                 $this->value = $value;
  55
  56                 if ( isset( $attr['expires'] ) ) {
  57                         $this->isSessionKey = false;
  58                         $this->expires = strtotime( $attr['expires'] );
  59                 }
  60
  61                 if ( isset( $attr['path'] ) ) {
  62                         $this->path = $attr['path'];
  63                 } else {
  64                         $this->path = '/';
  65                 }
  66
  67                 if ( isset( $attr['domain'] ) ) {
  68                         if ( self::validateCookieDomain( $attr['domain'] ) ) {
  69                                 $this->domain = $attr['domain'];
  70                         }
  71                 } else {
  72                         throw new InvalidArgumentException( '$attr must contain a domain' );
  73                 }
  74         }
  75
  76         /**
  77          * Return the true if the cookie is valid is valid.  Otherwise,
  78          * false.  The uses a method similar to IE cookie security
  79          * described here:
  80          * http://kuza55.blogspot.com/2008/02/understanding-cookie-security.html
  81          * A better method might be to use a blacklist like
  82          * http://publicsuffix.org/
  83          *
  84          * @todo fixme fails to detect 3-letter top-level domains
  85          * @todo fixme fails to detect 2-letter top-level domains for single-domain use (probably
  86          * not a big problem in practice, but there are test cases)
  87          *
  88          * @param string $domain The domain to validate
  89          * @param string $originDomain (optional) the domain the cookie originates from
  90          * @return bool
  91          */
  92         public static function validateCookieDomain( $domain, $originDomain = null ) {
  93                 $dc = explode( ".", $domain );
  94
  95                 // Don't allow a trailing dot or addresses without a or just a leading dot
  96                 if ( substr( $domain, -1 ) == '.' ||
  97                         count( $dc ) <= 1 ||
  98                         count( $dc ) == 2 && $dc[0] === ''
  99                 ) {
 100                         return false;
 101                 }
 102
 103                 // Only allow full, valid IP addresses
 104                 if ( preg_match( '/^[0-9.]+$/', $domain ) ) {
 105                         if ( count( $dc ) != 4 ) {
 106                                 return false;
 107                         }
 108
 109                         if ( ip2long( $domain ) === false ) {
 110                                 return false;
 111                         }
 112
 113                         if ( $originDomain == null || $originDomain == $domain ) {
 114                                 return true;
 115                         }
 116
 117                 }
 118
 119                 // Don't allow cookies for "co.uk" or "gov.uk", etc, but allow "supermarket.uk"
 120                 if ( strrpos( $domain, "." ) - strlen( $domain ) == -3 ) {
 121                         if ( ( count( $dc ) == 2 && strlen( $dc[0] ) <= 2 )
 122                                 || ( count( $dc ) == 3 && strlen( $dc[0] ) == "" && strlen( $dc[1] ) <= 2 ) ) {
 123                                 return false;
 124                         }
 125                         if ( ( count( $dc ) == 2 || ( count( $dc ) == 3 && $dc[0] == '' ) )
 126                                 && preg_match( '/(com|net|org|gov|edu)\...$/', $domain ) ) {
 127                                 return false;
 128                         }
 129                 }
 130
 131                 if ( $originDomain != null ) {
 132                         if ( substr( $domain, 0, 1 ) != '.' && $domain != $originDomain ) {
 133                                 return false;
 134                         }
 135
 136                         if ( substr( $domain, 0, 1 ) == '.'
 137                                 && substr_compare(
 138                                         $originDomain,
 139                                         $domain,
 140                                         -strlen( $domain ),
 141                                         strlen( $domain ),
 142                                         true
 143                                 ) != 0
 144                         ) {
 145                                 return false;
 146                         }
 147                 }
 148
 149                 return true;
 150         }
 151
 152         /**
 153          * Serialize the cookie jar into a format useful for HTTP Request headers.
 154          *
 155          * @param string $path The path that will be used. Required.
 156          * @param string $domain The domain that will be used. Required.
 157          * @return string
 158          */
 159         public function serializeToHttpRequest( $path, $domain ) {
 160                 $ret = '';
 161
 162                 if ( $this->canServeDomain( $domain )
 163                                 && $this->canServePath( $path )
 164                                 && $this->isUnExpired() ) {
 165                         $ret = $this->name . '=' . $this->value;
 166                 }
 167
 168                 return $ret;
 169         }
 170
 171         /**
 172          * @param string $domain
 173          * @return bool
 174          */
 175         protected function canServeDomain( $domain ) {
 176                 if ( $domain == $this->domain
 177                         || ( strlen( $domain ) > strlen( $this->domain )
 178                                 && substr( $this->domain, 0, 1 ) == '.'
 179                                 && substr_compare(
 180                                         $domain,
 181                                         $this->domain,
 182                                         -strlen( $this->domain ),
 183                                         strlen( $this->domain ),
 184                                         true
 185                                 ) == 0
 186                         )
 187                 ) {
 188                         return true;
 189                 }
 190
 191                 return false;
 192         }
 193
 194         /**
 195          * @param string $path
 196          * @return bool
 197          */
 198         protected function canServePath( $path ) {
 199                 return ( $this->path && substr_compare( $this->path, $path, 0, strlen( $this->path ) ) == 0 );
 200         }
 201
 202         /**
 203          * @return bool
 204          */
 205         protected function isUnExpired() {
 206                 return $this->isSessionKey || $this->expires > time();
 207         }
 208 }