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 $rclTargetTitle;
  31
  32         function __construct() {
  33                 parent::__construct( 'Recentchangeslinked' );
  34         }
  35
  36         public function getDefaultOptions() {
  37                 $opts = parent::getDefaultOptions();
  38                 $opts->add( 'target', '' );
  39                 $opts->add( 'showlinkedto', false );
  40                 return $opts;
  41         }
  42
  43         public function parseParameters( $par, FormOptions $opts ) {
  44                 $opts['target'] = $par;
  45         }
  46
  47         public function doMainQuery( $conds, $opts ) {
  48                 $target = $opts['target'];
  49                 $showlinkedto = $opts['showlinkedto'];
  50                 $limit = $opts['limit'];
  51
  52                 if ( $target === '' ) {
  53                         return false;
  54                 }
  55                 $outputPage = $this->getOutput();
  56                 $title = Title::newFromURL( $target );
  57                 if ( !$title || $title->isExternal() ) {
  58                         $outputPage->addHtml( '<div class="errorbox">' . $this->msg( 'allpagesbadtitle' )->parse() . '</div>' );
  59                         return false;
  60                 }
  61
  62                 $outputPage->setPageTitle( $this->msg( 'recentchangeslinked-title', $title->getPrefixedText() ) );
  63
  64                 /*
  65                  * Ordinary links are in the pagelinks table, while transclusions are
  66                  * in the templatelinks table, categorizations in categorylinks and
  67                  * image use in imagelinks.  We need to somehow combine all these.
  68                  * Special:Whatlinkshere does this by firing multiple queries and
  69                  * merging the results, but the code we inherit from our parent class
  70                  * expects only one result set so we use UNION instead.
  71                  */
  72
  73                 $dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
  74                 $id = $title->getArticleID();
  75                 $ns = $title->getNamespace();
  76                 $dbkey = $title->getDBkey();
  77
  78                 $tables = array( 'recentchanges' );
  79                 $select = RecentChange::selectFields();
  80                 $join_conds = array();
  81                 $query_options = array();
  82
  83                 // left join with watchlist table to highlight watched rows
  84                 $uid = $this->getUser()->getId();
  85                 if ( $uid && $this->getUser()->isAllowed( 'viewmywatchlist' ) ) {
  86                         $tables[] = 'watchlist';
  87                         $select[] = 'wl_user';
  88                         $join_conds['watchlist'] = array( 'LEFT JOIN', array(
  89                                 'wl_user' => $uid,
  90                                 'wl_title=rc_title',
  91                                 'wl_namespace=rc_namespace'
  92                         ));
  93                 }
  94                 if ( $this->getUser()->isAllowed( 'rollback' ) ) {
  95                         $tables[] = 'page';
  96                         $join_conds['page'] = array( 'LEFT JOIN', 'rc_cur_id=page_id' );
  97                         $select[] = 'page_latest';
  98                 }
  99                 ChangeTags::modifyDisplayQuery(
 100                         $tables,
 101                         $select,
 102                         $conds,
 103                         $join_conds,
 104                         $query_options,
 105                         $opts['tagfilter']
 106                 );
 107
 108                 if ( !wfRunHooks( 'SpecialRecentChangesQuery', array( &$conds, &$tables, &$join_conds, $opts, &$query_options, &$select ) ) ) {
 109                         return false;
 110                 }
 111
 112                 if ( $ns == NS_CATEGORY && !$showlinkedto ) {
 113                         // special handling for categories
 114                         // XXX: should try to make this less kludgy
 115                         $link_tables = array( 'categorylinks' );
 116                         $showlinkedto = true;
 117                 } else {
 118                         // for now, always join on these tables; really should be configurable as in whatlinkshere
 119                         $link_tables = array( 'pagelinks', 'templatelinks' );
 120                         // imagelinks only contains links to pages in NS_FILE
 121                         if ( $ns == NS_FILE || !$showlinkedto ) {
 122                                 $link_tables[] = 'imagelinks';
 123                         }
 124                 }
 125
 126                 if ( $id == 0 && !$showlinkedto ) {
 127                         return false; // nonexistent pages can't link to any pages
 128                 }
 129
 130                 // field name prefixes for all the various tables we might want to join with
 131                 $prefix = array( 'pagelinks' => 'pl', 'templatelinks' => 'tl', 'categorylinks' => 'cl', 'imagelinks' => 'il' );
 132
 133                 $subsql = array(); // SELECT statements to combine with UNION
 134
 135                 foreach ( $link_tables as $link_table ) {
 136                         $pfx = $prefix[$link_table];
 137
 138                         // imagelinks and categorylinks tables have no xx_namespace field, and have xx_to instead of xx_title
 139                         if ( $link_table == 'imagelinks' ) {
 140                                 $link_ns = NS_FILE;
 141                         } elseif ( $link_table == 'categorylinks' ) {
 142                                 $link_ns = NS_CATEGORY;
 143                         } else {
 144                                 $link_ns = 0;
 145                         }
 146
 147                         if ( $showlinkedto ) {
 148                                 // find changes to pages linking to this page
 149                                 if ( $link_ns ) {
 150                                         if ( $ns != $link_ns ) {
 151                                                 continue;
 152                                         } // should never happen, but check anyway
 153                                         $subconds = array( "{$pfx}_to" => $dbkey );
 154                                 } else {
 155                                         $subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
 156                                 }
 157                                 $subjoin = "rc_cur_id = {$pfx}_from";
 158                         } else {
 159                                 // find changes to pages linked from this page
 160                                 $subconds = array( "{$pfx}_from" => $id );
 161                                 if ( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
 162                                         $subconds["rc_namespace"] = $link_ns;
 163                                         $subjoin = "rc_title = {$pfx}_to";
 164                                 } else {
 165                                         $subjoin = array( "rc_namespace = {$pfx}_namespace", "rc_title = {$pfx}_title" );
 166                                 }
 167                         }
 168
 169                         if ( $dbr->unionSupportsOrderAndLimit() ) {
 170                                 $order = array( 'ORDER BY' => 'rc_timestamp DESC' );
 171                         } else {
 172                                 $order = array();
 173                         }
 174
 175                         $query = $dbr->selectSQLText(
 176                                 array_merge( $tables, array( $link_table ) ),
 177                                 $select,
 178                                 $conds + $subconds,
 179                                 __METHOD__,
 180                                 $order + $query_options,
 181                                 $join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) )
 182                         );
 183
 184                         if ( $dbr->unionSupportsOrderAndLimit() ) {
 185                                 $query = $dbr->limitResult( $query, $limit );
 186                         }
 187
 188                         $subsql[] = $query;
 189                 }
 190
 191                 if ( count( $subsql ) == 0 ) {
 192                         return false; // should never happen
 193                 }
 194                 if ( count( $subsql ) == 1 && $dbr->unionSupportsOrderAndLimit() ) {
 195                         $sql = $subsql[0];
 196                 } else {
 197                         // need to resort and relimit after union
 198                         $sql = $dbr->unionQueries( $subsql, false ) . ' ORDER BY rc_timestamp DESC';
 199                         $sql = $dbr->limitResult( $sql, $limit, false );
 200                 }
 201
 202                 $res = $dbr->query( $sql, __METHOD__ );
 203
 204                 if ( $res->numRows() == 0 ) {
 205                         $this->mResultEmpty = true;
 206                 }
 207
 208                 return $res;
 209         }
 210
 211         function setTopText( FormOptions $opts ) {
 212                 $target = $this->getTargetTitle();
 213                 if ( $target ) {
 214                         $this->getOutput()->addBacklinkSubtitle( $target );
 215                 }
 216         }
 217
 218         /**
 219          * Get options to be displayed in a form
 220          *
 221          * @param FormOptions $opts
 222          * @return array
 223          */
 224         function getExtraOptions( $opts ) {
 225                 $extraOpts = parent::getExtraOptions( $opts );
 226
 227                 $opts->consumeValues( array( 'showlinkedto', 'target' ) );
 228
 229                 $extraOpts['target'] = array( $this->msg( 'recentchangeslinked-page' )->escaped(),
 230                         Xml::input( 'target', 40, str_replace( '_', ' ', $opts['target'] ) ) .
 231                         Xml::check( 'showlinkedto', $opts['showlinkedto'], array( 'id' => 'showlinkedto' ) ) . ' ' .
 232                         Xml::label( $this->msg( 'recentchangeslinked-to' )->text(), 'showlinkedto' ) );
 233
 234                 return $extraOpts;
 235         }
 236
 237         public function getFeedObject( $feedFormat ) {
 238                 $feed = new ChangesFeed( $feedFormat, false );
 239                 $feedObj = $feed->getFeedObject(
 240                         $this->msg( 'recentchangeslinked-title', $this->getTargetTitle()->getPrefixedText() )
 241                                 ->inContentLanguage()->text(),
 242                         $this->msg( 'recentchangeslinked-feed' )->inContentLanguage()->text(),
 243                         $this->getPageTitle()->getFullURL()
 244                 );
 245                 return array( $feed, $feedObj );
 246         }
 247
 248         /**
 249          * @return Title
 250          */
 251         function getTargetTitle() {
 252                 if ( $this->rclTargetTitle === null ) {
 253                         $opts = $this->getOptions();
 254                         if ( isset( $opts['target'] ) && $opts['target'] !== '' ) {
 255                                 $this->rclTargetTitle = Title::newFromText( $opts['target'] );
 256                         } else {
 257                                 $this->rclTargetTitle = false;
 258                         }
 259                 }
 260                 return $this->rclTargetTitle;
 261         }
 262 }