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 /**
  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         public 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         public function getQueryInfo() {
  52                 $dbr = wfGetDB( DB_SLAVE );
  53
  54                 return [
  55                         'tables' => [
  56                                 'redirect',
  57                                 'p1' => 'page',
  58                                 'p2' => 'page',
  59                         ],
  60                         'fields' => [
  61                                 'namespace' => 'p1.page_namespace',
  62                                 'title' => 'p1.page_title',
  63                                 'value' => 'p1.page_title',
  64                                 'rd_namespace',
  65                                 'rd_title',
  66                         ],
  67                         'conds' => [
  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' => [
  76                                 'p1' => [ 'JOIN', [
  77                                         'rd_from=p1.page_id',
  78                                 ] ],
  79                                 'p2' => [ 'LEFT JOIN', [
  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 [ '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                         [],
 121                         [ 'redirect' => 'no' ]
 122                 );
 123                 $links = [];
 124                 // if the page is editable, add an edit link
 125                 if (
 126                         // check user permissions
 127                         $this->getUser()->isAllowed( 'edit' ) &&
 128                         // check, if the content model is editable through action=edit
 129                         ContentHandler::getForTitle( $fromObj )->supportsDirectEditing()
 130                 ) {
 131                         $links[] = Linker::linkKnown(
 132                                 $fromObj,
 133                                 $this->msg( 'brokenredirects-edit' )->escaped(),
 134                                 [],
 135                                 [ 'action' => 'edit' ]
 136                         );
 137                 }
 138                 $to = Linker::link(
 139                         $toObj,
 140                         null,
 141                         [],
 142                         [],
 143                         [ 'broken' ]
 144                 );
 145                 $arr = $this->getLanguage()->getArrow();
 146
 147                 $out = $from . $this->msg( 'word-separator' )->escaped();
 148
 149                 if ( $this->getUser()->isAllowed( 'delete' ) ) {
 150                         $links[] = Linker::linkKnown(
 151                                 $fromObj,
 152                                 $this->msg( 'brokenredirects-delete' )->escaped(),
 153                                 [],
 154                                 [ 'action' => 'delete' ]
 155                         );
 156                 }
 157
 158                 if ( $links ) {
 159                         $out .= $this->msg( 'parentheses' )->rawParams( $this->getLanguage()
 160                                 ->pipeList( $links ) )->escaped();
 161                 }
 162                 $out .= " {$arr} {$to}";
 163
 164                 return $out;
 165         }
 166
 167         /**
 168          * Cache page content model for performance
 169          *
 170          * @param IDatabase $db
 171          * @param ResultWrapper $res
 172          */
 173         function preprocessResults( $db, $res ) {
 174                 if ( !$res->numRows() ) {
 175                         return;
 176                 }
 177
 178                 $batch = new LinkBatch;
 179                 foreach ( $res as $row ) {
 180                         $batch->add( $row->namespace, $row->title );
 181                 }
 182                 $batch->execute();
 183
 184                 // Back to start for display
 185                 $res->seek( 0 );
 186         }
 187
 188         protected function getGroupName() {
 189                 return 'maintenance';
 190         }
 191 }