includes/specials/SpecialBrokenRedirects.php

   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 use Wikimedia\Rdbms\ResultWrapper;
  25
  26 /**
  27  * A special page listing redirects to non existent page. Those should be
  28  * fixed to point to an existing page.
  29  *
  30  * @ingroup SpecialPage
  31  */
  32 class BrokenRedirectsPage extends QueryPage {
  33         function __construct( $name = 'BrokenRedirects' ) {
  34                 parent::__construct( $name );
  35         }
  36
  37         public function isExpensive() {
  38                 return true;
  39         }
  40
  41         function isSyndicated() {
  42                 return false;
  43         }
  44
  45         function sortDescending() {
  46                 return false;
  47         }
  48
  49         function getPageHeader() {
  50                 return $this->msg( 'brokenredirectstext' )->parseAsBlock();
  51         }
  52
  53         public function getQueryInfo() {
  54                 $dbr = wfGetDB( DB_REPLICA );
  55
  56                 return [
  57                         'tables' => [
  58                                 'redirect',
  59                                 'p1' => 'page',
  60                                 'p2' => 'page',
  61                         ],
  62                         'fields' => [
  63                                 'namespace' => 'p1.page_namespace',
  64                                 'title' => 'p1.page_title',
  65                                 'value' => 'p1.page_title',
  66                                 'rd_namespace',
  67                                 'rd_title',
  68                         ],
  69                         'conds' => [
  70                                 // Exclude pages that don't exist locally as wiki pages,
  71                                 // but aren't "broken" either.
  72                                 // Special pages and interwiki links
  73                                 'rd_namespace >= 0',
  74                                 'rd_interwiki IS NULL OR rd_interwiki = ' . $dbr->addQuotes( '' ),
  75                                 'p2.page_namespace IS NULL',
  76                         ],
  77                         'join_conds' => [
  78                                 'p1' => [ 'JOIN', [
  79                                         'rd_from=p1.page_id',
  80                                 ] ],
  81                                 'p2' => [ 'LEFT JOIN', [
  82                                         'rd_namespace=p2.page_namespace',
  83                                         'rd_title=p2.page_title'
  84                                 ] ],
  85                         ],
  86                 ];
  87         }
  88
  89         /**
  90          * @return array
  91          */
  92         function getOrderFields() {
  93                 return [ 'rd_namespace', 'rd_title', 'rd_from' ];
  94         }
  95
  96         /**
  97          * @param Skin $skin
  98          * @param object $result Result row
  99          * @return string
 100          */
 101         function formatResult( $skin, $result ) {
 102                 $fromObj = Title::makeTitle( $result->namespace, $result->title );
 103                 if ( isset( $result->rd_title ) ) {
 104                         $toObj = Title::makeTitle( $result->rd_namespace, $result->rd_title );
 105                 } else {
 106                         $blinks = $fromObj->getBrokenLinksFrom(); # TODO: check for redirect, not for links
 107                         if ( $blinks ) {
 108                                 $toObj = $blinks[0];
 109                         } else {
 110                                 $toObj = false;
 111                         }
 112                 }
 113
 114                 $linkRenderer = $this->getLinkRenderer();
 115                 // $toObj may very easily be false if the $result list is cached
 116                 if ( !is_object( $toObj ) ) {
 117                         return '<del>' . $linkRenderer->makeLink( $fromObj ) . '</del>';
 118                 }
 119
 120                 $from = $linkRenderer->makeKnownLink(
 121                         $fromObj,
 122                         null,
 123                         [],
 124                         [ 'redirect' => 'no' ]
 125                 );
 126                 $links = [];
 127                 // if the page is editable, add an edit link
 128                 if (
 129                         // check user permissions
 130                         $this->getUser()->isAllowed( 'edit' ) &&
 131                         // check, if the content model is editable through action=edit
 132                         ContentHandler::getForTitle( $fromObj )->supportsDirectEditing()
 133                 ) {
 134                         $links[] = $linkRenderer->makeKnownLink(
 135                                 $fromObj,
 136                                 $this->msg( 'brokenredirects-edit' )->text(),
 137                                 [],
 138                                 [ 'action' => 'edit' ]
 139                         );
 140                 }
 141                 $to = $linkRenderer->makeBrokenLink( $toObj );
 142                 $arr = $this->getLanguage()->getArrow();
 143
 144                 $out = $from . $this->msg( 'word-separator' )->escaped();
 145
 146                 if ( $this->getUser()->isAllowed( 'delete' ) ) {
 147                         $links[] = $linkRenderer->makeKnownLink(
 148                                 $fromObj,
 149                                 $this->msg( 'brokenredirects-delete' )->text(),
 150                                 [],
 151                                 [ 'action' => 'delete' ]
 152                         );
 153                 }
 154
 155                 if ( $links ) {
 156                         $out .= $this->msg( 'parentheses' )->rawParams( $this->getLanguage()
 157                                 ->pipeList( $links ) )->escaped();
 158                 }
 159                 $out .= " {$arr} {$to}";
 160
 161                 return $out;
 162         }
 163
 164         /**
 165          * Cache page content model for performance
 166          *
 167          * @param IDatabase $db
 168          * @param ResultWrapper $res
 169          */
 170         function preprocessResults( $db, $res ) {
 171                 $this->executeLBFromResultWrapper( $res );
 172         }
 173
 174         protected function getGroupName() {
 175                 return 'maintenance';
 176         }
 177 }