includes/Cookie.php

   1 <?php
   2 /**
   3  * @defgroup HTTP HTTP
   4  */
   5
   6 class Cookie {
   7         protected $name;
   8         protected $value;
   9         protected $expires;
  10         protected $path;
  11         protected $domain;
  12         protected $isSessionKey = true;
  13         // TO IMPLEMENT  protected $secure
  14         // TO IMPLEMENT? protected $maxAge (add onto expires)
  15         // TO IMPLEMENT? protected $version
  16         // TO IMPLEMENT? protected $comment
  17
  18         function __construct( $name, $value, $attr ) {
  19                 $this->name = $name;
  20                 $this->set( $value, $attr );
  21         }
  22
  23         /**
  24          * Sets a cookie.  Used before a request to set up any individual
  25          * cookies.      Used internally after a request to parse the
  26          * Set-Cookie headers.
  27          *
  28          * @param $value String: the value of the cookie
  29          * @param $attr Array: possible key/values:
  30          *              expires  A date string
  31          *              path     The path this cookie is used on
  32          *              domain   Domain this cookie is used on
  33          */
  34         public function set( $value, $attr ) {
  35                 $this->value = $value;
  36
  37                 if ( isset( $attr['expires'] ) ) {
  38                         $this->isSessionKey = false;
  39                         $this->expires = strtotime( $attr['expires'] );
  40                 }
  41
  42                 if ( isset( $attr['path'] ) ) {
  43                         $this->path = $attr['path'];
  44                 } else {
  45                         $this->path = '/';
  46                 }
  47
  48                 if ( isset( $attr['domain'] ) ) {
  49                         if ( self::validateCookieDomain( $attr['domain'] ) ) {
  50                                 $this->domain = $attr['domain'];
  51                         }
  52                 } else {
  53                         throw new MWException( 'You must specify a domain.' );
  54                 }
  55         }
  56
  57         /**
  58          * Return the true if the cookie is valid is valid.  Otherwise,
  59          * false.  The uses a method similar to IE cookie security
  60          * described here:
  61          * http://kuza55.blogspot.com/2008/02/understanding-cookie-security.html
  62          * A better method might be to use a blacklist like
  63          * http://publicsuffix.org/
  64          *
  65          * @fixme fails to detect 3-letter top-level domains
  66          * @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)
  67          *
  68          * @param $domain String: the domain to validate
  69          * @param $originDomain String: (optional) the domain the cookie originates from
  70          * @return Boolean
  71          */
  72         public static function validateCookieDomain( $domain, $originDomain = null ) {
  73                 // Don't allow a trailing dot
  74                 if ( substr( $domain, -1 ) == '.' ) {
  75                         return false;
  76                 }
  77
  78                 $dc = explode( ".", $domain );
  79
  80                 // Only allow full, valid IP addresses
  81                 if ( preg_match( '/^[0-9.]+$/', $domain ) ) {
  82                         if ( count( $dc ) != 4 ) {
  83                                 return false;
  84                         }
  85
  86                         if ( ip2long( $domain ) === false ) {
  87                                 return false;
  88                         }
  89
  90                         if ( $originDomain == null || $originDomain == $domain ) {
  91                                 return true;
  92                         }
  93
  94                 }
  95
  96                 // Don't allow cookies for "co.uk" or "gov.uk", etc, but allow "supermarket.uk"
  97                 if ( strrpos( $domain, "." ) - strlen( $domain )  == -3 ) {
  98                         if ( ( count( $dc ) == 2 && strlen( $dc[0] ) <= 2 )
  99                                 || ( count( $dc ) == 3 && strlen( $dc[0] ) == "" && strlen( $dc[1] ) <= 2 ) ) {
 100                                 return false;
 101                         }
 102                         if ( ( count( $dc ) == 2 || ( count( $dc ) == 3 && $dc[0] == '' ) )
 103                                 && preg_match( '/(com|net|org|gov|edu)\...$/', $domain ) ) {
 104                                 return false;
 105                         }
 106                 }
 107
 108                 if ( $originDomain != null ) {
 109                         if ( substr( $domain, 0, 1 ) != '.' && $domain != $originDomain ) {
 110                                 return false;
 111                         }
 112
 113                         if ( substr( $domain, 0, 1 ) == '.'
 114                                 && substr_compare( $originDomain, $domain, -strlen( $domain ),
 115                                                                    strlen( $domain ), true ) != 0 ) {
 116                                 return false;
 117                         }
 118                 }
 119
 120                 return true;
 121         }
 122
 123         /**
 124          * Serialize the cookie jar into a format useful for HTTP Request headers.
 125          *
 126          * @param $path String: the path that will be used. Required.
 127          * @param $domain String: the domain that will be used. Required.
 128          * @return String
 129          */
 130         public function serializeToHttpRequest( $path, $domain ) {
 131                 $ret = '';
 132
 133                 if ( $this->canServeDomain( $domain )
 134                                 && $this->canServePath( $path )
 135                                 && $this->isUnExpired() ) {
 136                         $ret = $this->name . '=' . $this->value;
 137                 }
 138
 139                 return $ret;
 140         }
 141
 142         /**
 143          * @param $domain
 144          * @return bool
 145          */
 146         protected function canServeDomain( $domain ) {
 147                 if ( $domain == $this->domain
 148                         || ( strlen( $domain ) > strlen( $this->domain )
 149                                  && substr( $this->domain, 0, 1 ) == '.'
 150                                  && substr_compare( $domain, $this->domain, -strlen( $this->domain ),
 151                                                                         strlen( $this->domain ), true ) == 0 ) ) {
 152                         return true;
 153                 }
 154
 155                 return false;
 156         }
 157
 158         /**
 159          * @param $path
 160          * @return bool
 161          */
 162         protected function canServePath( $path ) {
 163                 return ( $this->path && substr_compare( $this->path, $path, 0, strlen( $this->path ) ) == 0 );
 164         }
 165
 166         /**
 167          * @return bool
 168          */
 169         protected function isUnExpired() {
 170                 return $this->isSessionKey || $this->expires > time();
 171         }
 172 }
 173
 174 class CookieJar {
 175         private $cookie = array();
 176
 177         /**
 178          * Set a cookie in the cookie jar.      Make sure only one cookie per-name exists.
 179          * @see Cookie::set()
 180          */
 181         public function setCookie ( $name, $value, $attr ) {
 182                 /* cookies: case insensitive, so this should work.
 183                  * We'll still send the cookies back in the same case we got them, though.
 184                  */
 185                 $index = strtoupper( $name );
 186
 187                 if ( isset( $this->cookie[$index] ) ) {
 188                         $this->cookie[$index]->set( $value, $attr );
 189                 } else {
 190                         $this->cookie[$index] = new Cookie( $name, $value, $attr );
 191                 }
 192         }
 193
 194         /**
 195          * @see Cookie::serializeToHttpRequest
 196          * @return string
 197          */
 198         public function serializeToHttpRequest( $path, $domain ) {
 199                 $cookies = array();
 200
 201                 foreach ( $this->cookie as $c ) {
 202                         $serialized = $c->serializeToHttpRequest( $path, $domain );
 203
 204                         if ( $serialized ) {
 205                                 $cookies[] = $serialized;
 206                         }
 207                 }
 208
 209                 return implode( '; ', $cookies );
 210         }
 211
 212         /**
 213          * Parse the content of an Set-Cookie HTTP Response header.
 214          *
 215          * @param $cookie String
 216          * @param $domain String: cookie's domain
 217          * @return null
 218          */
 219         public function parseCookieResponseHeader ( $cookie, $domain ) {
 220                 $len = strlen( 'Set-Cookie:' );
 221
 222                 if ( substr_compare( 'Set-Cookie:', $cookie, 0, $len, true ) === 0 ) {
 223                         $cookie = substr( $cookie, $len );
 224                 }
 225
 226                 $bit = array_map( 'trim', explode( ';', $cookie ) );
 227
 228                 if ( count( $bit ) >= 1 ) {
 229                         list( $name, $value ) = explode( '=', array_shift( $bit ), 2 );
 230                         $attr = array();
 231
 232                         foreach ( $bit as $piece ) {
 233                                 $parts = explode( '=', $piece );
 234                                 if ( count( $parts ) > 1 ) {
 235                                         $attr[strtolower( $parts[0] )] = $parts[1];
 236                                 } else {
 237                                         $attr[strtolower( $parts[0] )] = true;
 238                                 }
 239                         }
 240
 241                         if ( !isset( $attr['domain'] ) ) {
 242                                 $attr['domain'] = $domain;
 243                         } elseif ( !Cookie::validateCookieDomain( $attr['domain'], $domain ) ) {
 244                                 return null;
 245                         }
 246
 247                         $this->setCookie( $name, $value, $attr );
 248                 }
 249         }
 250 }