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\IResultWrapper;
  25 use Wikimedia\Rdbms\IDatabase;
  26
  27 /**
  28  * A special page listing redirects to non existent page. Those should be
  29  * fixed to point to an existing page.
  30  *
  31  * @ingroup SpecialPage
  32  */
  33 class BrokenRedirectsPage extends QueryPage {
  34         function __construct( $name = 'BrokenRedirects' ) {
  35                 parent::__construct( $name );
  36         }
  37
  38         public function isExpensive() {
  39                 return true;
  40         }
  41
  42         function isSyndicated() {
  43                 return false;
  44         }
  45
  46         function sortDescending() {
  47                 return false;
  48         }
  49
  50         function getPageHeader() {
  51                 return $this->msg( 'brokenredirectstext' )->parseAsBlock();
  52         }
  53
  54         public function getQueryInfo() {
  55                 $dbr = wfGetDB( DB_REPLICA );
  56
  57                 return [
  58                         'tables' => [
  59                                 'redirect',
  60                                 'p1' => 'page',
  61                                 'p2' => 'page',
  62                         ],
  63                         'fields' => [
  64                                 'namespace' => 'p1.page_namespace',
  65                                 'title' => 'p1.page_title',
  66                                 'value' => 'p1.page_title',
  67                                 'rd_namespace',
  68                                 'rd_title',
  69                                 'rd_fragment',
  70                         ],
  71                         'conds' => [
  72                                 // Exclude pages that don't exist locally as wiki pages,
  73                                 // but aren't "broken" either.
  74                                 // Special pages and interwiki links
  75                                 'rd_namespace >= 0',
  76                                 'rd_interwiki IS NULL OR rd_interwiki = ' . $dbr->addQuotes( '' ),
  77                                 'p2.page_namespace IS NULL',
  78                         ],
  79                         'join_conds' => [
  80                                 'p1' => [ 'JOIN', [
  81                                         'rd_from=p1.page_id',
  82                                 ] ],
  83                                 'p2' => [ 'LEFT JOIN', [
  84                                         'rd_namespace=p2.page_namespace',
  85                                         'rd_title=p2.page_title'
  86                                 ] ],
  87                         ],
  88                 ];
  89         }
  90
  91         /**
  92          * @return array
  93          */
  94         function getOrderFields() {
  95                 return [ 'rd_namespace', 'rd_title', 'rd_from' ];
  96         }
  97
  98         /**
  99          * @param Skin $skin
 100          * @param object $result Result row
 101          * @return string
 102          */
 103         function formatResult( $skin, $result ) {
 104                 $fromObj = Title::makeTitle( $result->namespace, $result->title );
 105                 if ( isset( $result->rd_title ) ) {
 106                         $toObj = Title::makeTitle( $result->rd_namespace, $result->rd_title, $result->rd_fragment );
 107                 } else {
 108                         $blinks = $fromObj->getBrokenLinksFrom(); # TODO: check for redirect, not for links
 109                         if ( $blinks ) {
 110                                 $toObj = $blinks[0];
 111                         } else {
 112                                 $toObj = false;
 113                         }
 114                 }
 115
 116                 $linkRenderer = $this->getLinkRenderer();
 117                 // $toObj may very easily be false if the $result list is cached
 118                 if ( !is_object( $toObj ) ) {
 119                         return '<del>' . $linkRenderer->makeLink( $fromObj ) . '</del>';
 120                 }
 121
 122                 $from = $linkRenderer->makeKnownLink(
 123                         $fromObj,
 124                         null,
 125                         [],
 126                         [ 'redirect' => 'no' ]
 127                 );
 128                 $links = [];
 129                 // if the page is editable, add an edit link
 130                 if (
 131                         // check user permissions
 132                         $this->getUser()->isAllowed( 'edit' ) &&
 133                         // check, if the content model is editable through action=edit
 134                         ContentHandler::getForTitle( $fromObj )->supportsDirectEditing()
 135                 ) {
 136                         $links[] = $linkRenderer->makeKnownLink(
 137                                 $fromObj,
 138                                 $this->msg( 'brokenredirects-edit' )->text(),
 139                                 [],
 140                                 [ 'action' => 'edit' ]
 141                         );
 142                 }
 143                 $to = $linkRenderer->makeBrokenLink( $toObj, $toObj->getFullText() );
 144                 $arr = $this->getLanguage()->getArrow();
 145
 146                 $out = $from . $this->msg( 'word-separator' )->escaped();
 147
 148                 if ( $this->getUser()->isAllowed( 'delete' ) ) {
 149                         $links[] = $linkRenderer->makeKnownLink(
 150                                 $fromObj,
 151                                 $this->msg( 'brokenredirects-delete' )->text(),
 152                                 [],
 153                                 [ 'action' => 'delete' ]
 154                         );
 155                 }
 156
 157                 if ( $links ) {
 158                         $out .= $this->msg( 'parentheses' )->rawParams( $this->getLanguage()
 159                                 ->pipeList( $links ) )->escaped();
 160                 }
 161                 $out .= " {$arr} {$to}";
 162
 163                 return $out;
 164         }
 165
 166         public function execute( $par ) {
 167                 $this->addHelpLink( 'Help:Redirects' );
 168                 parent::execute( $par );
 169         }
 170
 171         /**
 172          * Cache page content model for performance
 173          *
 174          * @param IDatabase $db
 175          * @param IResultWrapper $res
 176          */
 177         function preprocessResults( $db, $res ) {
 178                 $this->executeLBFromResultWrapper( $res );
 179         }
 180
 181         protected function getGroupName() {
 182                 return 'maintenance';
 183         }
 184 }