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                         return false;
  60                 }
  61
  62                 return true;
  63         }
  64
  65         protected function showNoRedirectPage() {
  66                 $this->addHelpLink( 'Help:Diff' );
  67                 $this->setHeaders();
  68                 $this->outputHeader();
  69                 $this->showForm();
  70         }
  71
  72         private function showForm() {
  73                 $form = HTMLForm::factory( 'ooui', [
  74                         'oldid' => [
  75                                 'name' => 'oldid',
  76                                 'type' => 'int',
  77                                 'label-message' => 'diff-form-oldid',
  78                         ],
  79                         'diff' => [
  80                                 'name' => 'diff',
  81                                 'class' => 'HTMLTextField',
  82                                 'label-message' => 'diff-form-revid',
  83                         ],
  84                 ], $this->getContext(), 'diff-form' );
  85                 $form->setSubmitTextMsg( 'diff-form-submit' );
  86                 $form->setSubmitCallback( [ $this, 'onFormSubmit' ] );
  87                 $form->show();
  88         }
  89
  90         public function onFormSubmit( $formData ) {
  91                 $params = [];
  92                 if ( $formData['oldid'] ) {
  93                         $params[] = $formData['oldid'];
  94                 }
  95                 if ( $formData['diff'] ) {
  96                         $params[] = $formData['diff'];
  97                 }
  98                 $title = $this->getPageTitle( $params ? implode( '/', $params ) : null );
  99                 $url = $title->getFullUrlForRedirect();
 100                 $this->getOutput()->redirect( $url );
 101         }
 102
 103         public function getDescription() {
 104                 // 'diff' message is in lowercase, using own message
 105                 return $this->msg( 'diff-form' )->text();
 106         }
 107
 108         public function getName() {
 109                 return 'diff-form';
 110         }
 111
 112         public function isListed() {
 113                 return true;
 114         }
 115
 116         protected function getGroupName() {
 117                 return 'redirects';
 118         }
 119 }