includes/specials/SpecialGoToInterwiki.php

   1 <?php
   2 /**
   3  * Implements Special:GoToInterwiki
   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 SpecialPage
  22  */
  23
  24 /**
  25  * Landing page for non-local interwiki links.
  26  *
  27  * Meant to warn people that the site they're visiting
  28  * is not the local wiki (In case of phishing tricks).
  29  * Only meant to be used for things that directly
  30  * redirect from url (e.g. Special:Search/google:foo )
  31  * Not meant for general interwiki linking (e.g.
  32  * [[google:foo]] should still directly link)
  33  *
  34  * @ingroup SpecialPage
  35  */
  36 class SpecialGoToInterwiki extends UnlistedSpecialPage {
  37         public function __construct( $name = 'GoToInterwiki' ) {
  38                 parent::__construct( $name );
  39         }
  40
  41         public function execute( $par ) {
  42                 // Allow forcing an interstitial for local interwikis. This is used
  43                 // when a redirect page is reached via a special page which resolves
  44                 // to a user-dependent value (as defined by
  45                 // RedirectSpecialPage::personallyIdentifiableTarget). See the hack
  46                 // for avoiding T109724 in MediaWiki::performRequest (which also
  47                 // explains why we can't use a query parameter instead).
  48                 //
  49                 // HHVM dies when substr_compare is used on an empty string so ensure it's not.
  50                 $force = ( substr_compare( $par ?: 'x', 'force/', 0, 6 ) === 0 );
  51                 if ( $force ) {
  52                         $par = substr( $par, 6 );
  53                 }
  54
  55                 $this->setHeaders();
  56                 $target = Title::newFromText( $par );
  57                 // Disallow special pages as a precaution against
  58                 // possible redirect loops.
  59                 if ( !$target || $target->isSpecialPage() ) {
  60                         $this->getOutput()->setStatusCode( 404 );
  61                         $this->getOutput()->addWikiMsg( 'gotointerwiki-invalid' );
  62                         return;
  63                 }
  64
  65                 $url = $target->getFullURL();
  66                 if ( !$target->isExternal() || ( $target->isLocal() && !$force ) ) {
  67                         // Either a normal page, or a local interwiki.
  68                         // Just redirect.
  69                         $this->getOutput()->redirect( $url, '301' );
  70                 } else {
  71                         $this->getOutput()->addWikiMsg(
  72                                 'gotointerwiki-external',
  73                                 $url,
  74                                 $target->getFullText()
  75                         );
  76                 }
  77         }
  78
  79         /**
  80          * @return bool
  81          */
  82         public function requiresWrite() {
  83                 return false;
  84         }
  85
  86         /**
  87          * @return string
  88          */
  89         protected function getGroupName() {
  90                 return 'redirects';
  91         }
  92 }