includes/api/ApiQueryTokens.php

   1 <?php
   2 /**
   3  * Module to fetch tokens via action=query&meta=tokens
   4  *
   5  * Created on August 8, 2014
   6  *
   7  * Copyright © 2014 Brad Jorsch bjorsch@wikimedia.org
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  * @since 1.24
  26  */
  27
  28 /**
  29  * Module to fetch tokens via action=query&meta=tokens
  30  *
  31  * @ingroup API
  32  * @since 1.24
  33  */
  34 class ApiQueryTokens extends ApiQueryBase {
  35
  36         public function execute() {
  37                 $params = $this->extractRequestParams();
  38                 $res = array(
  39                         ApiResult::META_TYPE => 'assoc',
  40                 );
  41
  42                 if ( $this->lacksSameOriginSecurity() ) {
  43                         $this->setWarning( 'Tokens may not be obtained when the same-origin policy is not applied' );
  44                         return;
  45                 }
  46
  47                 $user = $this->getUser();
  48                 $session = $this->getRequest()->getSession();
  49                 $salts = self::getTokenTypeSalts();
  50                 foreach ( $params['type'] as $type ) {
  51                         $res[$type . 'token'] = self::getToken( $user, $session, $salts[$type] )->toString();
  52                 }
  53
  54                 $this->getResult()->addValue( 'query', $this->getModuleName(), $res );
  55         }
  56
  57         /**
  58          * Get the salts for known token types
  59          * @return (string|array)[] Returning a string will use that as the salt
  60          *  for User::getEditTokenObject() to fetch the token, which will give a
  61          *  LoggedOutEditToken (always "+\\") for anonymous users. Returning an
  62          *  array will use it as parameters to MediaWiki\\Session\\Session::getToken(),
  63          *  which will always return a full token even for anonymous users.
  64          */
  65         public static function getTokenTypeSalts() {
  66                 static $salts = null;
  67                 if ( !$salts ) {
  68                         $salts = array(
  69                                 'csrf' => '',
  70                                 'watch' => 'watch',
  71                                 'patrol' => 'patrol',
  72                                 'rollback' => 'rollback',
  73                                 'userrights' => 'userrights',
  74                                 'login' => array( '', 'login' ),
  75                                 'createaccount' => array( '', 'createaccount' ),
  76                         );
  77                         Hooks::run( 'ApiQueryTokensRegisterTypes', array( &$salts ) );
  78                         ksort( $salts );
  79                 }
  80
  81                 return $salts;
  82         }
  83
  84         /**
  85          * Get a token from a salt
  86          * @param User $user
  87          * @param MediaWiki\\Session\\Session $session
  88          * @param string|array $salt A string will be used as the salt for
  89          *  User::getEditTokenObject() to fetch the token, which will give a
  90          *  LoggedOutEditToken (always "+\\") for anonymous users. An array will
  91          *  be used as parameters to MediaWiki\\Session\\Session::getToken(), which
  92          *  will always return a full token even for anonymous users. An array will
  93          *  also persist the session.
  94          * @return MediaWiki\\Session\\Token
  95          */
  96         public static function getToken( User $user, MediaWiki\Session\Session $session, $salt ) {
  97                 if ( is_array( $salt ) ) {
  98                         $session->persist();
  99                         return call_user_func_array( array( $session, 'getToken' ), $salt );
 100                 } else {
 101                         return $user->getEditTokenObject( $salt, $session->getRequest() );
 102                 }
 103         }
 104
 105         public function getAllowedParams() {
 106                 return array(
 107                         'type' => array(
 108                                 ApiBase::PARAM_DFLT => 'csrf',
 109                                 ApiBase::PARAM_ISMULTI => true,
 110                                 ApiBase::PARAM_TYPE => array_keys( self::getTokenTypeSalts() ),
 111                         ),
 112                 );
 113         }
 114
 115         protected function getExamplesMessages() {
 116                 return array(
 117                         'action=query&meta=tokens'
 118                                 => 'apihelp-query+tokens-example-simple',
 119                         'action=query&meta=tokens&type=watch|patrol'
 120                                 => 'apihelp-query+tokens-example-types',
 121                 );
 122         }
 123
 124         public function isReadMode() {
 125                 // So login tokens can be fetched on private wikis
 126                 return false;
 127         }
 128
 129         public function getCacheMode( $params ) {
 130                 return 'private';
 131         }
 132
 133         public function getHelpUrls() {
 134                 return 'https://www.mediawiki.org/wiki/API:Tokens';
 135         }
 136 }