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
  42                 return $opts;
  43         }
  44
  45         public function parseParameters( $par, FormOptions $opts ) {
  46                 $opts['target'] = $par;
  47         }
  48
  49         public function doMainQuery( $conds, $opts ) {
  50                 $target = $opts['target'];
  51                 $showlinkedto = $opts['showlinkedto'];
  52                 $limit = $opts['limit'];
  53
  54                 if ( $target === '' ) {
  55                         return false;
  56                 }
  57                 $outputPage = $this->getOutput();
  58                 $title = Title::newFromURL( $target );
  59                 if ( !$title || $title->isExternal() ) {
  60                         $outputPage->addHtml( '<div class="errorbox">' . $this->msg( 'allpagesbadtitle' )
  61                                         ->parse() . '</div>' );
  62
  63                         return false;
  64                 }
  65
  66                 $outputPage->setPageTitle( $this->msg( 'recentchangeslinked-title', $title->getPrefixedText() ) );
  67
  68                 /*
  69                  * Ordinary links are in the pagelinks table, while transclusions are
  70                  * in the templatelinks table, categorizations in categorylinks and
  71                  * image use in imagelinks.  We need to somehow combine all these.
  72                  * Special:Whatlinkshere does this by firing multiple queries and
  73                  * merging the results, but the code we inherit from our parent class
  74                  * expects only one result set so we use UNION instead.
  75                  */
  76
  77                 $dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
  78                 $id = $title->getArticleID();
  79                 $ns = $title->getNamespace();
  80                 $dbkey = $title->getDBkey();
  81
  82                 $tables = array( 'recentchanges' );
  83                 $select = RecentChange::selectFields();
  84                 $join_conds = array();
  85                 $query_options = array();
  86
  87                 // left join with watchlist table to highlight watched rows
  88                 $uid = $this->getUser()->getId();
  89                 if ( $uid && $this->getUser()->isAllowed( 'viewmywatchlist' ) ) {
  90                         $tables[] = 'watchlist';
  91                         $select[] = 'wl_user';
  92                         $join_conds['watchlist'] = array( 'LEFT JOIN', array(
  93                                 'wl_user' => $uid,
  94                                 'wl_title=rc_title',
  95                                 'wl_namespace=rc_namespace'
  96                         ) );
  97                 }
  98                 if ( $this->getUser()->isAllowed( 'rollback' ) ) {
  99                         $tables[] = 'page';
 100                         $join_conds['page'] = array( 'LEFT JOIN', 'rc_cur_id=page_id' );
 101                         $select[] = 'page_latest';
 102                 }
 103                 ChangeTags::modifyDisplayQuery(
 104                         $tables,
 105                         $select,
 106                         $conds,
 107                         $join_conds,
 108                         $query_options,
 109                         $opts['tagfilter']
 110                 );
 111
 112                 if ( !wfRunHooks( 'SpecialRecentChangesQuery',
 113                         array( &$conds, &$tables, &$join_conds, $opts, &$query_options, &$select ),
 114                         '1.23' )
 115                 ) {
 116                         return false;
 117                 }
 118
 119                 if ( $ns == NS_CATEGORY && !$showlinkedto ) {
 120                         // special handling for categories
 121                         // XXX: should try to make this less kludgy
 122                         $link_tables = array( 'categorylinks' );
 123                         $showlinkedto = true;
 124                 } else {
 125                         // for now, always join on these tables; really should be configurable as in whatlinkshere
 126                         $link_tables = array( 'pagelinks', 'templatelinks' );
 127                         // imagelinks only contains links to pages in NS_FILE
 128                         if ( $ns == NS_FILE || !$showlinkedto ) {
 129                                 $link_tables[] = 'imagelinks';
 130                         }
 131                 }
 132
 133                 if ( $id == 0 && !$showlinkedto ) {
 134                         return false; // nonexistent pages can't link to any pages
 135                 }
 136
 137                 // field name prefixes for all the various tables we might want to join with
 138                 $prefix = array(
 139                         'pagelinks' => 'pl',
 140                         'templatelinks' => 'tl',
 141                         'categorylinks' => 'cl',
 142                         'imagelinks' => 'il'
 143                 );
 144
 145                 $subsql = array(); // SELECT statements to combine with UNION
 146
 147                 foreach ( $link_tables as $link_table ) {
 148                         $pfx = $prefix[$link_table];
 149
 150                         // imagelinks and categorylinks tables have no xx_namespace field,
 151                         // and have xx_to instead of xx_title
 152                         if ( $link_table == 'imagelinks' ) {
 153                                 $link_ns = NS_FILE;
 154                         } elseif ( $link_table == 'categorylinks' ) {
 155                                 $link_ns = NS_CATEGORY;
 156                         } else {
 157                                 $link_ns = 0;
 158                         }
 159
 160                         if ( $showlinkedto ) {
 161                                 // find changes to pages linking to this page
 162                                 if ( $link_ns ) {
 163                                         if ( $ns != $link_ns ) {
 164                                                 continue;
 165                                         } // should never happen, but check anyway
 166                                         $subconds = array( "{$pfx}_to" => $dbkey );
 167                                 } else {
 168                                         $subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
 169                                 }
 170                                 $subjoin = "rc_cur_id = {$pfx}_from";
 171                         } else {
 172                                 // find changes to pages linked from this page
 173                                 $subconds = array( "{$pfx}_from" => $id );
 174                                 if ( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
 175                                         $subconds["rc_namespace"] = $link_ns;
 176                                         $subjoin = "rc_title = {$pfx}_to";
 177                                 } else {
 178                                         $subjoin = array( "rc_namespace = {$pfx}_namespace", "rc_title = {$pfx}_title" );
 179                                 }
 180                         }
 181
 182                         if ( $dbr->unionSupportsOrderAndLimit() ) {
 183                                 $order = array( 'ORDER BY' => 'rc_timestamp DESC' );
 184                         } else {
 185                                 $order = array();
 186                         }
 187
 188                         $query = $dbr->selectSQLText(
 189                                 array_merge( $tables, array( $link_table ) ),
 190                                 $select,
 191                                 $conds + $subconds,
 192                                 __METHOD__,
 193                                 $order + $query_options,
 194                                 $join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) )
 195                         );
 196
 197                         if ( $dbr->unionSupportsOrderAndLimit() ) {
 198                                 $query = $dbr->limitResult( $query, $limit );
 199                         }
 200
 201                         $subsql[] = $query;
 202                 }
 203
 204                 if ( count( $subsql ) == 0 ) {
 205                         return false; // should never happen
 206                 }
 207                 if ( count( $subsql ) == 1 && $dbr->unionSupportsOrderAndLimit() ) {
 208                         $sql = $subsql[0];
 209                 } else {
 210                         // need to resort and relimit after union
 211                         $sql = $dbr->unionQueries( $subsql, false ) . ' ORDER BY rc_timestamp DESC';
 212                         $sql = $dbr->limitResult( $sql, $limit, false );
 213                 }
 214
 215                 $res = $dbr->query( $sql, __METHOD__ );
 216
 217                 if ( $res->numRows() == 0 ) {
 218                         $this->mResultEmpty = true;
 219                 }
 220
 221                 return $res;
 222         }
 223
 224         function setTopText( FormOptions $opts ) {
 225                 $target = $this->getTargetTitle();
 226                 if ( $target ) {
 227                         $this->getOutput()->addBacklinkSubtitle( $target );
 228                 }
 229         }
 230
 231         /**
 232          * Get options to be displayed in a form
 233          *
 234          * @param FormOptions $opts
 235          * @return array
 236          */
 237         function getExtraOptions( $opts ) {
 238                 $extraOpts = parent::getExtraOptions( $opts );
 239
 240                 $opts->consumeValues( array( 'showlinkedto', 'target' ) );
 241
 242                 $extraOpts['target'] = array( $this->msg( 'recentchangeslinked-page' )->escaped(),
 243                         Xml::input( 'target', 40, str_replace( '_', ' ', $opts['target'] ) ) .
 244                         Xml::check( 'showlinkedto', $opts['showlinkedto'], array( 'id' => 'showlinkedto' ) ) . ' ' .
 245                         Xml::label( $this->msg( 'recentchangeslinked-to' )->text(), 'showlinkedto' ) );
 246
 247                 return $extraOpts;
 248         }
 249
 250         /**
 251          * @return Title
 252          */
 253         function getTargetTitle() {
 254                 if ( $this->rclTargetTitle === null ) {
 255                         $opts = $this->getOptions();
 256                         if ( isset( $opts['target'] ) && $opts['target'] !== '' ) {
 257                                 $this->rclTargetTitle = Title::newFromText( $opts['target'] );
 258                         } else {
 259                                 $this->rclTargetTitle = false;
 260                         }
 261                 }
 262
 263                 return $this->rclTargetTitle;
 264         }
 265 }