includes/specials/SpecialDiff.php

   1 <?php
   2 /**
   3  * Redirect from Special:Diff/### to index.php?diff=### and
   4  * from Special:Diff/###/### to index.php?oldid=###&diff=###.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  * @ingroup SpecialPage
  23  */
  24
  25 /**
  26  * Redirect from Special:Diff/### to index.php?diff=### and
  27  * from Special:Diff/###/### to index.php?oldid=###&diff=###.
  28  *
  29  * All of the following are valid usages:
  30  * - [[Special:Diff/12345]] (diff of a revision with the previous one)
  31  * - [[Special:Diff/12345/prev]] (diff of a revision with the previous one as well)
  32  * - [[Special:Diff/12345/next]] (diff of a revision with the next one)
  33  * - [[Special:Diff/12345/cur]] (diff of a revision with the latest one of that page)
  34  * - [[Special:Diff/12345/98765]] (diff between arbitrary two revisions)
  35  *
  36  * @ingroup SpecialPage
  37  * @since 1.23
  38  */
  39 class SpecialDiff extends RedirectSpecialPage {
  40         public function __construct() {
  41                 parent::__construct( 'Diff' );
  42                 $this->mAllowedRedirectParams = [];
  43         }
  44
  45         /**
  46          * @param string|null $subpage
  47          * @return Title|bool
  48          */
  49         public function getRedirect( $subpage ) {
  50                 $parts = explode( '/', $subpage );
  51
  52                 // Try to parse the values given, generating somewhat pretty URLs if possible
  53                 if ( count( $parts ) === 1 && $parts[0] !== '' ) {
  54                         $this->mAddedRedirectParams['diff'] = $parts[0];
  55                 } elseif ( count( $parts ) === 2 ) {
  56                         $this->mAddedRedirectParams['oldid'] = $parts[0];
  57                         $this->mAddedRedirectParams['diff'] = $parts[1];
  58                 } else {
  59                         // Wrong number of parameters, bail out
  60                         $this->addHelpLink( 'Help:Diff' );
  61                         throw new ErrorPageError( 'nopagetitle', 'nopagetext' );
  62                 }
  63
  64                 return true;
  65         }
  66 }