includes/specials/SpecialRecentchangeslinked.php

   1 <?php
   2
   3 /**
   4  * This is to display changes made to all articles linked in an article.
   5  * @ingroup SpecialPage
   6  */
   7 class SpecialRecentchangeslinked extends SpecialRecentchanges {
   8
   9         function __construct(){
  10                 SpecialPage::SpecialPage( 'Recentchangeslinked' );
  11                 $this->includable( true );
  12         }
  13
  14         public function getDefaultOptions() {
  15                 $opts = parent::getDefaultOptions();
  16                 $opts->add( 'target', '' );
  17                 $opts->add( 'showlinkedto', false );
  18                 return $opts;
  19         }
  20
  21         public function parseParameters( $par, FormOptions $opts ) {
  22                 $opts['target'] = $par;
  23         }
  24
  25         public function feedSetup(){
  26                 global $wgRequest;
  27                 $opts = parent::feedSetup();
  28                 $opts['target'] = $wgRequest->getVal( 'target' );
  29                 return $opts;
  30         }
  31
  32         public function getFeedObject( $feedFormat ){
  33                 $feed = new ChangesFeed( $feedFormat, false );
  34                 $feedObj = $feed->getFeedObject(
  35                         wfMsgForContent( 'recentchangeslinked-title', $this->mTargetTitle->getPrefixedText() ),
  36                         wfMsgForContent( 'recentchangeslinked' )
  37                 );
  38                 return array( $feed, $feedObj );
  39         }
  40
  41         public function doMainQuery( $conds, $opts ) {
  42                 global $wgUser, $wgOut;
  43
  44                 $target = $opts['target'];
  45                 $showlinkedto = $opts['showlinkedto'];
  46                 $limit = $opts['limit'];
  47
  48                 if ( $target === '' ) {
  49                         return false;
  50                 }
  51                 $title = Title::newFromURL( $target );
  52                 if( !$title || $title->getInterwiki() != '' ){
  53                         $wgOut->wrapWikiMsg( '<div class="errorbox">$1</div><br clear="both" />', 'allpagesbadtitle' );
  54                         return false;
  55                 }
  56                 $this->mTargetTitle = $title;
  57
  58                 $wgOut->setPageTitle( wfMsg( 'recentchangeslinked-title', $title->getPrefixedText() ) );
  59
  60                 /*
  61                  * Ordinary links are in the pagelinks table, while transclusions are
  62                  * in the templatelinks table, categorizations in categorylinks and
  63                  * image use in imagelinks.  We need to somehow combine all these.
  64                  * Special:Whatlinkshere does this by firing multiple queries and
  65                  * merging the results, but the code we inherit from our parent class
  66                  * expects only one result set so we use UNION instead.
  67                  */
  68
  69                 $dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
  70                 $id = $title->getArticleId();
  71                 $ns = $title->getNamespace();
  72                 $dbkey = $title->getDBkey();
  73
  74                 $tables = array( 'recentchanges' );
  75                 $select = array( $dbr->tableName( 'recentchanges' ) . '.*' );
  76                 $join_conds = array();
  77
  78                 // left join with watchlist table to highlight watched rows
  79                 if( $uid = $wgUser->getId() ) {
  80                         $tables[] = 'watchlist';
  81                         $select[] = 'wl_user';
  82                         $join_conds['watchlist'] = array( 'LEFT JOIN', "wl_user={$uid} AND wl_title=rc_title AND wl_namespace=rc_namespace" );
  83                 }
  84
  85                 // XXX: parent class does this, should we too?
  86                 // wfRunHooks('SpecialRecentChangesQuery', array( &$conds, &$tables, &$join_conds, $opts ) );
  87
  88                 if( $ns == NS_CATEGORY && !$showlinkedto ) {
  89                         // special handling for categories
  90                         // XXX: should try to make this less klugy
  91                         $link_tables = array( 'categorylinks' );
  92                         $showlinkedto = true;
  93                 } else {
  94                         // for now, always join on these tables; really should be configurable as in whatlinkshere
  95                         $link_tables = array( 'pagelinks', 'templatelinks' );
  96                         // imagelinks only contains links to pages in NS_FILE
  97                         if( $ns == NS_FILE || !$showlinkedto ) $link_tables[] = 'imagelinks';
  98                 }
  99
 100                 if( $id == 0 && !$showlinkedto )
 101                         return false; // nonexistent pages can't link to any pages
 102
 103                 // field name prefixes for all the various tables we might want to join with
 104                 $prefix = array( 'pagelinks' => 'pl', 'templatelinks' => 'tl', 'categorylinks' => 'cl', 'imagelinks' => 'il' );
 105
 106                 $subsql = array(); // SELECT statements to combine with UNION
 107
 108                 foreach( $link_tables as $link_table ) {
 109                         $pfx = $prefix[$link_table];
 110
 111                         // imagelinks and categorylinks tables have no xx_namespace field, and have xx_to instead of xx_title
 112                         if( $link_table == 'imagelinks' ) $link_ns = NS_FILE;
 113                         else if( $link_table == 'categorylinks' ) $link_ns = NS_CATEGORY;
 114                         else $link_ns = 0;
 115
 116                         if( $showlinkedto ) {
 117                                 // find changes to pages linking to this page
 118                                 if( $link_ns ) {
 119                                         if( $ns != $link_ns ) continue; // should never happen, but check anyway
 120                                         $subconds = array( "{$pfx}_to" => $dbkey );
 121                                 } else {
 122                                         $subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
 123                                 }
 124                                 $subjoin = "rc_cur_id = {$pfx}_from";
 125                         } else {
 126                                 // find changes to pages linked from this page
 127                                 $subconds = array( "{$pfx}_from" => $id );
 128                                 if( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
 129                                         $subconds["rc_namespace"] = $link_ns;
 130                                         $subjoin = "rc_title = {$pfx}_to";
 131                                 } else {
 132                                         $subjoin = "rc_namespace = {$pfx}_namespace AND rc_title = {$pfx}_title";
 133                                 }
 134                         }
 135
 136                         $subsql[] = $dbr->selectSQLText( array_merge( $tables, array( $link_table ) ), $select, $conds + $subconds,
 137                                                          __METHOD__, array( 'ORDER BY' => 'rc_timestamp DESC', 'LIMIT' => $limit ),
 138                                                          $join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) ) );
 139                 }
 140
 141                 if( count($subsql) == 0 )
 142                         return false; // should never happen
 143                 if( count($subsql) == 1 )
 144                         $sql = $subsql[0];
 145                 else {
 146                         // need to resort and relimit after union
 147                         $sql = "(" . implode( ") UNION (", $subsql ) . ") ORDER BY rc_timestamp DESC LIMIT {$limit}";
 148                 }
 149
 150                 $res = $dbr->query( $sql, __METHOD__ );
 151
 152                 if( $res->numRows() == 0 )
 153                         $this->mResultEmpty = true;
 154
 155                 return $res;
 156         }
 157
 158         function getExtraOptions( $opts ){
 159                 $opts->consumeValues( array( 'showlinkedto', 'target' ) );
 160                 $extraOpts = array();
 161                 $extraOpts['namespace'] = $this->namespaceFilterForm( $opts );
 162                 $extraOpts['target'] = array( wfMsg( 'recentchangeslinked-page' ),
 163                         Xml::input( 'target', 40, str_replace('_',' ',$opts['target']) ) .
 164                         Xml::check( 'showlinkedto', $opts['showlinkedto'], array('id' => 'showlinkedto') ) . ' ' .
 165                         Xml::label( wfMsg("recentchangeslinked-to"), 'showlinkedto' ) );
 166                 return $extraOpts;
 167         }
 168
 169         function setTopText( OutputPage $out, FormOptions $opts ) {
 170                 global $wgUser;
 171                 $skin = $wgUser->getSkin();
 172                 if( isset( $this->mTargetTitle ) && is_object( $this->mTargetTitle ) )
 173                         $out->setSubtitle( wfMsg( 'recentchangeslinked-backlink', $skin->link( $this->mTargetTitle,
 174                                 $this->mTargetTitle->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
 175         }
 176
 177         function setBottomText( OutputPage $out, FormOptions $opts ){
 178                 if( isset( $this->mTargetTitle ) && is_object( $this->mTargetTitle ) ){
 179                         global $wgUser;
 180                         $out->setFeedAppendQuery( "target=" . urlencode( $this->mTargetTitle->getPrefixedDBkey() ) );
 181                 }
 182                 if( isset( $this->mResultEmpty ) && $this->mResultEmpty ){
 183                         $out->addWikiMsg( 'recentchangeslinked-noresult' );
 184                 }
 185         }
 186 }