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   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  	function __construct() {
  41          parent::__construct( 'Diff' );
  42          $this->mAllowedRedirectParams = array();
  43      }
  44  
  45  	function getRedirect( $subpage ) {
  46          $parts = explode( '/', $subpage );
  47  
  48          // Try to parse the values given, generating somewhat pretty URLs if possible
  49          if ( count( $parts ) === 1 && $parts[0] !== '' ) {
  50              $this->mAddedRedirectParams['diff'] = $parts[0];
  51          } elseif ( count( $parts ) === 2 ) {
  52              $this->mAddedRedirectParams['oldid'] = $parts[0];
  53              $this->mAddedRedirectParams['diff'] = $parts[1];
  54          } else {
  55              // Wrong number of parameters, bail out
  56              throw new ErrorPageError( 'nopagetitle', 'nopagetext' );
  57          }
  58  
  59          return true;
  60      }
  61  }