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   1  <?php
   2  /**
   3   * Implements Special:Brokenredirects
   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   * A special page listing redirects to non existent page. Those should be
  26   * fixed to point to an existing page.
  27   *
  28   * @ingroup SpecialPage
  29   */
  30  class BrokenRedirectsPage extends QueryPage {
  31  	function __construct( $name = 'BrokenRedirects' ) {
  32          parent::__construct( $name );
  33      }
  34  
  35  	function isExpensive() {
  36          return true;
  37      }
  38  
  39  	function isSyndicated() {
  40          return false;
  41      }
  42  
  43  	function sortDescending() {
  44          return false;
  45      }
  46  
  47  	function getPageHeader() {
  48          return $this->msg( 'brokenredirectstext' )->parseAsBlock();
  49      }
  50  
  51  	function getQueryInfo() {
  52          $dbr = wfGetDB( DB_SLAVE );
  53  
  54          return array(
  55              'tables' => array(
  56                  'redirect',
  57                  'p1' => 'page',
  58                  'p2' => 'page',
  59              ),
  60              'fields' => array(
  61                  'namespace' => 'p1.page_namespace',
  62                  'title' => 'p1.page_title',
  63                  'value' => 'p1.page_title',
  64                  'rd_namespace',
  65                  'rd_title',
  66              ),
  67              'conds' => array(
  68                  // Exclude pages that don't exist locally as wiki pages,
  69                  // but aren't "broken" either.
  70                  // Special pages and interwiki links
  71                  'rd_namespace >= 0',
  72                  'rd_interwiki IS NULL OR rd_interwiki = ' . $dbr->addQuotes( '' ),
  73                  'p2.page_namespace IS NULL',
  74              ),
  75              'join_conds' => array(
  76                  'p1' => array( 'JOIN', array(
  77                      'rd_from=p1.page_id',
  78                  ) ),
  79                  'p2' => array( 'LEFT JOIN', array(
  80                      'rd_namespace=p2.page_namespace',
  81                      'rd_title=p2.page_title'
  82                  ) ),
  83              ),
  84          );
  85      }
  86  
  87      /**
  88       * @return array
  89       */
  90  	function getOrderFields() {
  91          return array( 'rd_namespace', 'rd_title', 'rd_from' );
  92      }
  93  
  94      /**
  95       * @param Skin $skin
  96       * @param object $result Result row
  97       * @return string
  98       */
  99  	function formatResult( $skin, $result ) {
 100          $fromObj = Title::makeTitle( $result->namespace, $result->title );
 101          if ( isset( $result->rd_title ) ) {
 102              $toObj = Title::makeTitle( $result->rd_namespace, $result->rd_title );
 103          } else {
 104              $blinks = $fromObj->getBrokenLinksFrom(); # TODO: check for redirect, not for links
 105              if ( $blinks ) {
 106                  $toObj = $blinks[0];
 107              } else {
 108                  $toObj = false;
 109              }
 110          }
 111  
 112          // $toObj may very easily be false if the $result list is cached
 113          if ( !is_object( $toObj ) ) {
 114              return '<del>' . Linker::link( $fromObj ) . '</del>';
 115          }
 116  
 117          $from = Linker::linkKnown(
 118              $fromObj,
 119              null,
 120              array(),
 121              array( 'redirect' => 'no' )
 122          );
 123          $links = array();
 124          $links[] = Linker::linkKnown(
 125              $fromObj,
 126              $this->msg( 'brokenredirects-edit' )->escaped(),
 127              array(),
 128              array( 'action' => 'edit' )
 129          );
 130          $to = Linker::link(
 131              $toObj,
 132              null,
 133              array(),
 134              array(),
 135              array( 'broken' )
 136          );
 137          $arr = $this->getLanguage()->getArrow();
 138  
 139          $out = $from . $this->msg( 'word-separator' )->escaped();
 140  
 141          if ( $this->getUser()->isAllowed( 'delete' ) ) {
 142              $links[] = Linker::linkKnown(
 143                  $fromObj,
 144                  $this->msg( 'brokenredirects-delete' )->escaped(),
 145                  array(),
 146                  array( 'action' => 'delete' )
 147              );
 148          }
 149  
 150          $out .= $this->msg( 'parentheses' )->rawParams( $this->getLanguage()
 151              ->pipeList( $links ) )->escaped();
 152          $out .= " {$arr} {$to}";
 153  
 154          return $out;
 155      }
 156  
 157  	protected function getGroupName() {
 158          return 'maintenance';
 159      }
 160  }