includes/session/ImmutableSessionProviderWithCookie.php

   1 <?php
   2 /**
   3  * MediaWiki session provider base class
   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 Session
  22  */
  23
  24 namespace MediaWiki\Session;
  25
  26 use WebRequest;
  27
  28 /**
  29  * An ImmutableSessionProviderWithCookie doesn't persist the user, but
  30  * optionally can use a cookie to support multiple IDs per session.
  31  *
  32  * As mentioned in the documentation for SessionProvider, many methods that are
  33  * technically "cannot persist ID" could be turned into "can persist ID but
  34  * not changing User" using a session cookie. This class implements such an
  35  * optional session cookie.
  36  *
  37  * @ingroup Session
  38  * @since 1.27
  39  */
  40 abstract class ImmutableSessionProviderWithCookie extends SessionProvider {
  41
  42         /** @var string|null */
  43         protected $sessionCookieName = null;
  44         protected $sessionCookieOptions = array();
  45
  46         /**
  47          * @param array $params Keys include:
  48          *  - sessionCookieName: Session cookie name, if multiple sessions per
  49          *    client are to be supported.
  50          *  - sessionCookieOptions: Options to pass to WebResponse::setCookie().
  51          */
  52         public function __construct( $params = array() ) {
  53                 parent::__construct();
  54
  55                 if ( isset( $params['sessionCookieName'] ) ) {
  56                         if ( !is_string( $params['sessionCookieName'] ) ) {
  57                                 throw new \InvalidArgumentException( 'sessionCookieName must be a string' );
  58                         }
  59                         $this->sessionCookieName = $params['sessionCookieName'];
  60                 }
  61                 if ( isset( $params['sessionCookieOptions'] ) ) {
  62                         if ( !is_array( $params['sessionCookieOptions'] ) ) {
  63                                 throw new \InvalidArgumentException( 'sessionCookieOptions must be an array' );
  64                         }
  65                         $this->sessionCookieOptions = $params['sessionCookieOptions'];
  66                 }
  67         }
  68
  69         /**
  70          * Get the session ID from the cookie, if any.
  71          *
  72          * Only call this if $this->sessionCookieName !== null. If
  73          * sessionCookieName is null, do some logic (probably involving a call to
  74          * $this->hashToSessionId()) to create the single session ID corresponding
  75          * to this WebRequest instead of calling this method.
  76          *
  77          * @param WebRequest $request
  78          * @return string|null
  79          */
  80         protected function getSessionIdFromCookie( WebRequest $request ) {
  81                 if ( $this->sessionCookieName === null ) {
  82                         throw new \BadMethodCallException(
  83                                 __METHOD__ . ' may not be called when $this->sessionCookieName === null'
  84                         );
  85                 }
  86
  87                 $prefix = isset( $this->sessionCookieOptions['prefix'] )
  88                         ? $this->sessionCookieOptions['prefix']
  89                         : $this->config->get( 'CookiePrefix' );
  90                 $id = $request->getCookie( $this->sessionCookieName, $prefix );
  91                 return SessionManager::validateSessionId( $id ) ? $id : null;
  92         }
  93
  94         public function persistsSessionId() {
  95                 return $this->sessionCookieName !== null;
  96         }
  97
  98         public function canChangeUser() {
  99                 return false;
 100         }
 101
 102         public function persistSession( SessionBackend $session, WebRequest $request ) {
 103                 if ( $this->sessionCookieName === null ) {
 104                         return;
 105                 }
 106
 107                 $response = $request->response();
 108                 if ( $response->headersSent() ) {
 109                         // Can't do anything now
 110                         $this->logger->debug( __METHOD__ . ': Headers already sent' );
 111                         return;
 112                 }
 113
 114                 $options = $this->sessionCookieOptions;
 115                 if ( $session->shouldForceHTTPS() || $session->getUser()->requiresHTTPS() ) {
 116                         $response->setCookie( 'forceHTTPS', 'true', $session->shouldRememberUser() ? 0 : null,
 117                                 array( 'prefix' => '', 'secure' => false ) + $options );
 118                         $options['secure'] = true;
 119                 }
 120
 121                 $response->setCookie( $this->sessionCookieName, $session->getId(), null, $options );
 122         }
 123
 124         public function unpersistSession( WebRequest $request ) {
 125                 if ( $this->sessionCookieName === null ) {
 126                         return;
 127                 }
 128
 129                 $response = $request->response();
 130                 if ( $response->headersSent() ) {
 131                         // Can't do anything now
 132                         $this->logger->debug( __METHOD__ . ': Headers already sent' );
 133                         return;
 134                 }
 135
 136                 $response->clearCookie( $this->sessionCookieName, $this->sessionCookieOptions );
 137         }
 138
 139         public function getVaryCookies() {
 140                 if ( $this->sessionCookieName === null ) {
 141                         return array();
 142                 }
 143
 144                 $prefix = isset( $this->sessionCookieOptions['prefix'] )
 145                         ? $this->sessionCookieOptions['prefix']
 146                         : $this->config->get( 'CookiePrefix' );
 147                 return array( $prefix . $this->sessionCookieName );
 148         }
 149
 150         public function whyNoSession() {
 151                 return wfMessage( 'sessionprovider-nocookies' );
 152         }
 153 }