includes/specials/SpecialRecentchangeslinked.php

   1 <?php
   2 /**
   3  * Implements Special:Recentchangeslinked
   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  * This is to display changes made to all articles linked in an article.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class SpecialRecentChangesLinked extends SpecialRecentChanges {
  30         /** @var bool|Title */
  31         protected $rclTargetTitle;
  32
  33         function __construct() {
  34                 parent::__construct( 'Recentchangeslinked' );
  35         }
  36
  37         public function getDefaultOptions() {
  38                 $opts = parent::getDefaultOptions();
  39                 $opts->add( 'target', '' );
  40                 $opts->add( 'showlinkedto', false );
  41                 return $opts;
  42         }
  43
  44         public function parseParameters( $par, FormOptions $opts ) {
  45                 $opts['target'] = $par;
  46         }
  47
  48         public function doMainQuery( $conds, $opts ) {
  49                 $target = $opts['target'];
  50                 $showlinkedto = $opts['showlinkedto'];
  51                 $limit = $opts['limit'];
  52
  53                 if ( $target === '' ) {
  54                         return false;
  55                 }
  56                 $outputPage = $this->getOutput();
  57                 $title = Title::newFromURL( $target );
  58                 if ( !$title || $title->isExternal() ) {
  59                         $outputPage->addHtml( '<div class="errorbox">' . $this->msg( 'allpagesbadtitle' )
  60                                         ->parse() . '</div>' );
  61                         return false;
  62                 }
  63
  64                 $outputPage->setPageTitle( $this->msg( 'recentchangeslinked-title', $title->getPrefixedText() ) );
  65
  66                 /*
  67                  * Ordinary links are in the pagelinks table, while transclusions are
  68                  * in the templatelinks table, categorizations in categorylinks and
  69                  * image use in imagelinks.  We need to somehow combine all these.
  70                  * Special:Whatlinkshere does this by firing multiple queries and
  71                  * merging the results, but the code we inherit from our parent class
  72                  * expects only one result set so we use UNION instead.
  73                  */
  74
  75                 $dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
  76                 $id = $title->getArticleID();
  77                 $ns = $title->getNamespace();
  78                 $dbkey = $title->getDBkey();
  79
  80                 $tables = array( 'recentchanges' );
  81                 $select = RecentChange::selectFields();
  82                 $join_conds = array();
  83                 $query_options = array();
  84
  85                 // left join with watchlist table to highlight watched rows
  86                 $uid = $this->getUser()->getId();
  87                 if ( $uid && $this->getUser()->isAllowed( 'viewmywatchlist' ) ) {
  88                         $tables[] = 'watchlist';
  89                         $select[] = 'wl_user';
  90                         $join_conds['watchlist'] = array( 'LEFT JOIN', array(
  91                                 'wl_user' => $uid,
  92                                 'wl_title=rc_title',
  93                                 'wl_namespace=rc_namespace'
  94                         ));
  95                 }
  96                 if ( $this->getUser()->isAllowed( 'rollback' ) ) {
  97                         $tables[] = 'page';
  98                         $join_conds['page'] = array( 'LEFT JOIN', 'rc_cur_id=page_id' );
  99                         $select[] = 'page_latest';
 100                 }
 101                 ChangeTags::modifyDisplayQuery(
 102                         $tables,
 103                         $select,
 104                         $conds,
 105                         $join_conds,
 106                         $query_options,
 107                         $opts['tagfilter']
 108                 );
 109
 110                 if ( !wfRunHooks( 'SpecialRecentChangesQuery',
 111                         array( &$conds, &$tables, &$join_conds, $opts, &$query_options, &$select ) )
 112                 ) {
 113                         return false;
 114                 }
 115
 116                 if ( $ns == NS_CATEGORY && !$showlinkedto ) {
 117                         // special handling for categories
 118                         // XXX: should try to make this less kludgy
 119                         $link_tables = array( 'categorylinks' );
 120                         $showlinkedto = true;
 121                 } else {
 122                         // for now, always join on these tables; really should be configurable as in whatlinkshere
 123                         $link_tables = array( 'pagelinks', 'templatelinks' );
 124                         // imagelinks only contains links to pages in NS_FILE
 125                         if ( $ns == NS_FILE || !$showlinkedto ) {
 126                                 $link_tables[] = 'imagelinks';
 127                         }
 128                 }
 129
 130                 if ( $id == 0 && !$showlinkedto ) {
 131                         return false; // nonexistent pages can't link to any pages
 132                 }
 133
 134                 // field name prefixes for all the various tables we might want to join with
 135                 $prefix = array(
 136                         'pagelinks' => 'pl',
 137                         'templatelinks' => 'tl',
 138                         'categorylinks' => 'cl',
 139                         'imagelinks' => 'il'
 140                 );
 141
 142                 $subsql = array(); // SELECT statements to combine with UNION
 143
 144                 foreach ( $link_tables as $link_table ) {
 145                         $pfx = $prefix[$link_table];
 146
 147                         // imagelinks and categorylinks tables have no xx_namespace field,
 148                         // and have xx_to instead of xx_title
 149                         if ( $link_table == 'imagelinks' ) {
 150                                 $link_ns = NS_FILE;
 151                         } elseif ( $link_table == 'categorylinks' ) {
 152                                 $link_ns = NS_CATEGORY;
 153                         } else {
 154                                 $link_ns = 0;
 155                         }
 156
 157                         if ( $showlinkedto ) {
 158                                 // find changes to pages linking to this page
 159                                 if ( $link_ns ) {
 160                                         if ( $ns != $link_ns ) {
 161                                                 continue;
 162                                         } // should never happen, but check anyway
 163                                         $subconds = array( "{$pfx}_to" => $dbkey );
 164                                 } else {
 165                                         $subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
 166                                 }
 167                                 $subjoin = "rc_cur_id = {$pfx}_from";
 168                         } else {
 169                                 // find changes to pages linked from this page
 170                                 $subconds = array( "{$pfx}_from" => $id );
 171                                 if ( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
 172                                         $subconds["rc_namespace"] = $link_ns;
 173                                         $subjoin = "rc_title = {$pfx}_to";
 174                                 } else {
 175                                         $subjoin = array( "rc_namespace = {$pfx}_namespace", "rc_title = {$pfx}_title" );
 176                                 }
 177                         }
 178
 179                         if ( $dbr->unionSupportsOrderAndLimit() ) {
 180                                 $order = array( 'ORDER BY' => 'rc_timestamp DESC' );
 181                         } else {
 182                                 $order = array();
 183                         }
 184
 185                         $query = $dbr->selectSQLText(
 186                                 array_merge( $tables, array( $link_table ) ),
 187                                 $select,
 188                                 $conds + $subconds,
 189                                 __METHOD__,
 190                                 $order + $query_options,
 191                                 $join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) )
 192                         );
 193
 194                         if ( $dbr->unionSupportsOrderAndLimit() ) {
 195                                 $query = $dbr->limitResult( $query, $limit );
 196                         }
 197
 198                         $subsql[] = $query;
 199                 }
 200
 201                 if ( count( $subsql ) == 0 ) {
 202                         return false; // should never happen
 203                 }
 204                 if ( count( $subsql ) == 1 && $dbr->unionSupportsOrderAndLimit() ) {
 205                         $sql = $subsql[0];
 206                 } else {
 207                         // need to resort and relimit after union
 208                         $sql = $dbr->unionQueries( $subsql, false ) . ' ORDER BY rc_timestamp DESC';
 209                         $sql = $dbr->limitResult( $sql, $limit, false );
 210                 }
 211
 212                 $res = $dbr->query( $sql, __METHOD__ );
 213
 214                 if ( $res->numRows() == 0 ) {
 215                         $this->mResultEmpty = true;
 216                 }
 217
 218                 return $res;
 219         }
 220
 221         function setTopText( FormOptions $opts ) {
 222                 $target = $this->getTargetTitle();
 223                 if ( $target ) {
 224                         $this->getOutput()->addBacklinkSubtitle( $target );
 225                 }
 226         }
 227
 228         /**
 229          * Get options to be displayed in a form
 230          *
 231          * @param FormOptions $opts
 232          * @return array
 233          */
 234         function getExtraOptions( $opts ) {
 235                 $extraOpts = parent::getExtraOptions( $opts );
 236
 237                 $opts->consumeValues( array( 'showlinkedto', 'target' ) );
 238
 239                 $extraOpts['target'] = array( $this->msg( 'recentchangeslinked-page' )->escaped(),
 240                         Xml::input( 'target', 40, str_replace( '_', ' ', $opts['target'] ) ) .
 241                         Xml::check( 'showlinkedto', $opts['showlinkedto'], array( 'id' => 'showlinkedto' ) ) . ' ' .
 242                         Xml::label( $this->msg( 'recentchangeslinked-to' )->text(), 'showlinkedto' ) );
 243
 244                 return $extraOpts;
 245         }
 246
 247         /**
 248          * @return Title
 249          */
 250         function getTargetTitle() {
 251                 if ( $this->rclTargetTitle === null ) {
 252                         $opts = $this->getOptions();
 253                         if ( isset( $opts['target'] ) && $opts['target'] !== '' ) {
 254                                 $this->rclTargetTitle = Title::newFromText( $opts['target'] );
 255                         } else {
 256                                 $this->rclTargetTitle = false;
 257                         }
 258                 }
 259                 return $this->rclTargetTitle;
 260         }
 261 }