includes/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 MWException
  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 MWException( 'You must specify 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 && $dc[0] === '' ) {
  99                         return false;
 100                 }
 101
 102                 // Only allow full, valid IP addresses
 103                 if ( preg_match( '/^[0-9.]+$/', $domain ) ) {
 104                         if ( count( $dc ) != 4 ) {
 105                                 return false;
 106                         }
 107
 108                         if ( ip2long( $domain ) === false ) {
 109                                 return false;
 110                         }
 111
 112                         if ( $originDomain == null || $originDomain == $domain ) {
 113                                 return true;
 114                         }
 115
 116                 }
 117
 118                 // Don't allow cookies for "co.uk" or "gov.uk", etc, but allow "supermarket.uk"
 119                 if ( strrpos( $domain, "." ) - strlen( $domain ) == -3 ) {
 120                         if ( ( count( $dc ) == 2 && strlen( $dc[0] ) <= 2 )
 121                                 || ( count( $dc ) == 3 && strlen( $dc[0] ) == "" && strlen( $dc[1] ) <= 2 ) ) {
 122                                 return false;
 123                         }
 124                         if ( ( count( $dc ) == 2 || ( count( $dc ) == 3 && $dc[0] == '' ) )
 125                                 && preg_match( '/(com|net|org|gov|edu)\...$/', $domain ) ) {
 126                                 return false;
 127                         }
 128                 }
 129
 130                 if ( $originDomain != null ) {
 131                         if ( substr( $domain, 0, 1 ) != '.' && $domain != $originDomain ) {
 132                                 return false;
 133                         }
 134
 135                         if ( substr( $domain, 0, 1 ) == '.'
 136                                 && substr_compare(
 137                                         $originDomain,
 138                                         $domain,
 139                                         -strlen( $domain ),
 140                                         strlen( $domain ),
 141                                         true
 142                                 ) != 0
 143                         ) {
 144                                 return false;
 145                         }
 146                 }
 147
 148                 return true;
 149         }
 150
 151         /**
 152          * Serialize the cookie jar into a format useful for HTTP Request headers.
 153          *
 154          * @param string $path The path that will be used. Required.
 155          * @param string $domain The domain that will be used. Required.
 156          * @return string
 157          */
 158         public function serializeToHttpRequest( $path, $domain ) {
 159                 $ret = '';
 160
 161                 if ( $this->canServeDomain( $domain )
 162                                 && $this->canServePath( $path )
 163                                 && $this->isUnExpired() ) {
 164                         $ret = $this->name . '=' . $this->value;
 165                 }
 166
 167                 return $ret;
 168         }
 169
 170         /**
 171          * @param string $domain
 172          * @return bool
 173          */
 174         protected function canServeDomain( $domain ) {
 175                 if ( $domain == $this->domain
 176                         || ( strlen( $domain ) > strlen( $this->domain )
 177                                 && substr( $this->domain, 0, 1 ) == '.'
 178                                 && substr_compare(
 179                                         $domain,
 180                                         $this->domain,
 181                                         -strlen( $this->domain ),
 182                                         strlen( $this->domain ),
 183                                         true
 184                                 ) == 0
 185                         )
 186                 ) {
 187                         return true;
 188                 }
 189
 190                 return false;
 191         }
 192
 193         /**
 194          * @param string $path
 195          * @return bool
 196          */
 197         protected function canServePath( $path ) {
 198                 return ( $this->path && substr_compare( $this->path, $path, 0, strlen( $this->path ) ) == 0 );
 199         }
 200
 201         /**
 202          * @return bool
 203          */
 204         protected function isUnExpired() {
 205                 return $this->isSessionKey || $this->expires > time();
 206         }
 207 }
 208
 209 class CookieJar {
 210         private $cookie = array();
 211
 212         /**
 213          * Set a cookie in the cookie jar. Make sure only one cookie per-name exists.
 214          * @see Cookie::set()
 215          * @param string $name
 216          * @param string $value
 217          * @param array $attr
 218          */
 219         public function setCookie( $name, $value, $attr ) {
 220                 /* cookies: case insensitive, so this should work.
 221                  * We'll still send the cookies back in the same case we got them, though.
 222                  */
 223                 $index = strtoupper( $name );
 224
 225                 if ( isset( $this->cookie[$index] ) ) {
 226                         $this->cookie[$index]->set( $value, $attr );
 227                 } else {
 228                         $this->cookie[$index] = new Cookie( $name, $value, $attr );
 229                 }
 230         }
 231
 232         /**
 233          * @see Cookie::serializeToHttpRequest
 234          * @param string $path
 235          * @param string $domain
 236          * @return string
 237          */
 238         public function serializeToHttpRequest( $path, $domain ) {
 239                 $cookies = array();
 240
 241                 foreach ( $this->cookie as $c ) {
 242                         $serialized = $c->serializeToHttpRequest( $path, $domain );
 243
 244                         if ( $serialized ) {
 245                                 $cookies[] = $serialized;
 246                         }
 247                 }
 248
 249                 return implode( '; ', $cookies );
 250         }
 251
 252         /**
 253          * Parse the content of an Set-Cookie HTTP Response header.
 254          *
 255          * @param string $cookie
 256          * @param string $domain Cookie's domain
 257          * @return null
 258          */
 259         public function parseCookieResponseHeader( $cookie, $domain ) {
 260                 $len = strlen( 'Set-Cookie:' );
 261
 262                 if ( substr_compare( 'Set-Cookie:', $cookie, 0, $len, true ) === 0 ) {
 263                         $cookie = substr( $cookie, $len );
 264                 }
 265
 266                 $bit = array_map( 'trim', explode( ';', $cookie ) );
 267
 268                 if ( count( $bit ) >= 1 ) {
 269                         list( $name, $value ) = explode( '=', array_shift( $bit ), 2 );
 270                         $attr = array();
 271
 272                         foreach ( $bit as $piece ) {
 273                                 $parts = explode( '=', $piece );
 274                                 if ( count( $parts ) > 1 ) {
 275                                         $attr[strtolower( $parts[0] )] = $parts[1];
 276                                 } else {
 277                                         $attr[strtolower( $parts[0] )] = true;
 278                                 }
 279                         }
 280
 281                         if ( !isset( $attr['domain'] ) ) {
 282                                 $attr['domain'] = $domain;
 283                         } elseif ( !Cookie::validateCookieDomain( $attr['domain'], $domain ) ) {
 284                                 return null;
 285                         }
 286
 287                         $this->setCookie( $name, $value, $attr );
 288                 }
 289         }
 290 }