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                 $opts->add( 'tagfilter', '' );
  19                 return $opts;
  20         }
  21
  22         public function parseParameters( $par, FormOptions $opts ) {
  23                 $opts['target'] = $par;
  24         }
  25
  26         public function feedSetup() {
  27                 global $wgRequest;
  28                 $opts = parent::feedSetup();
  29                 # Feed is cached on limit,hideminor,target; other params would randomly not work
  30                 $opts['target'] = $wgRequest->getVal( 'target' );
  31                 return $opts;
  32         }
  33
  34         public function getFeedObject( $feedFormat ){
  35                 $feed = new ChangesFeed( $feedFormat, false );
  36                 $feedObj = $feed->getFeedObject(
  37                         wfMsgForContent( 'recentchangeslinked-title', $this->mTargetTitle->getPrefixedText() ),
  38                         wfMsgForContent( 'recentchangeslinked' )
  39                 );
  40                 return array( $feed, $feedObj );
  41         }
  42
  43         public function doMainQuery( $conds, $opts ) {
  44                 global $wgUser, $wgOut;
  45
  46                 $target = $opts['target'];
  47                 $showlinkedto = $opts['showlinkedto'];
  48                 $limit = $opts['limit'];
  49
  50                 if ( $target === '' ) {
  51                         return false;
  52                 }
  53                 $title = Title::newFromURL( $target );
  54                 if( !$title || $title->getInterwiki() != '' ){
  55                         $wgOut->wrapWikiMsg( '<div class="errorbox">$1</div><br clear="both" />', 'allpagesbadtitle' );
  56                         return false;
  57                 }
  58                 $this->mTargetTitle = $title;
  59
  60                 $wgOut->setPageTitle( wfMsg( 'recentchangeslinked-title', $title->getPrefixedText() ) );
  61
  62                 /*
  63                  * Ordinary links are in the pagelinks table, while transclusions are
  64                  * in the templatelinks table, categorizations in categorylinks and
  65                  * image use in imagelinks.  We need to somehow combine all these.
  66                  * Special:Whatlinkshere does this by firing multiple queries and
  67                  * merging the results, but the code we inherit from our parent class
  68                  * expects only one result set so we use UNION instead.
  69                  */
  70
  71                 $dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
  72                 $id = $title->getArticleId();
  73                 $ns = $title->getNamespace();
  74                 $dbkey = $title->getDBkey();
  75
  76                 $tables = array( 'recentchanges' );
  77                 $select = array( $dbr->tableName( 'recentchanges' ) . '.*' );
  78                 $join_conds = array();
  79                 $query_options = array();
  80
  81                 // left join with watchlist table to highlight watched rows
  82                 if( $uid = $wgUser->getId() ) {
  83                         $tables[] = 'watchlist';
  84                         $select[] = 'wl_user';
  85                         $join_conds['watchlist'] = array( 'LEFT JOIN', "wl_user={$uid} AND wl_title=rc_title AND wl_namespace=rc_namespace" );
  86                 }
  87
  88                 ChangeTags::modifyDisplayQuery( $tables, $select, $conds, $join_conds,
  89                         $query_options, $opts['tagfilter'] );
  90
  91                 // XXX: parent class does this, should we too?
  92                 // wfRunHooks('SpecialRecentChangesQuery', array( &$conds, &$tables, &$join_conds, $opts ) );
  93
  94                 if( $ns == NS_CATEGORY && !$showlinkedto ) {
  95                         // special handling for categories
  96                         // XXX: should try to make this less klugy
  97                         $link_tables = array( 'categorylinks' );
  98                         $showlinkedto = true;
  99                 } else {
 100                         // for now, always join on these tables; really should be configurable as in whatlinkshere
 101                         $link_tables = array( 'pagelinks', 'templatelinks' );
 102                         // imagelinks only contains links to pages in NS_FILE
 103                         if( $ns == NS_FILE || !$showlinkedto ) $link_tables[] = 'imagelinks';
 104                 }
 105
 106                 if( $id == 0 && !$showlinkedto )
 107                         return false; // nonexistent pages can't link to any pages
 108
 109                 // field name prefixes for all the various tables we might want to join with
 110                 $prefix = array( 'pagelinks' => 'pl', 'templatelinks' => 'tl', 'categorylinks' => 'cl', 'imagelinks' => 'il' );
 111
 112                 $subsql = array(); // SELECT statements to combine with UNION
 113
 114                 foreach( $link_tables as $link_table ) {
 115                         $pfx = $prefix[$link_table];
 116
 117                         // imagelinks and categorylinks tables have no xx_namespace field, and have xx_to instead of xx_title
 118                         if( $link_table == 'imagelinks' ) $link_ns = NS_FILE;
 119                         else if( $link_table == 'categorylinks' ) $link_ns = NS_CATEGORY;
 120                         else $link_ns = 0;
 121
 122                         if( $showlinkedto ) {
 123                                 // find changes to pages linking to this page
 124                                 if( $link_ns ) {
 125                                         if( $ns != $link_ns ) continue; // should never happen, but check anyway
 126                                         $subconds = array( "{$pfx}_to" => $dbkey );
 127                                 } else {
 128                                         $subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
 129                                 }
 130                                 $subjoin = "rc_cur_id = {$pfx}_from";
 131                         } else {
 132                                 // find changes to pages linked from this page
 133                                 $subconds = array( "{$pfx}_from" => $id );
 134                                 if( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
 135                                         $subconds["rc_namespace"] = $link_ns;
 136                                         $subjoin = "rc_title = {$pfx}_to";
 137                                 } else {
 138                                         $subjoin = "rc_namespace = {$pfx}_namespace AND rc_title = {$pfx}_title";
 139                                 }
 140                         }
 141
 142                         $subsql[] = $dbr->selectSQLText(
 143                                 array_merge( $tables, array( $link_table ) ),
 144                                 $select,
 145                                 $conds + $subconds,
 146                                 __METHOD__,
 147                                 array( 'ORDER BY' => 'rc_timestamp DESC', 'LIMIT' => $limit ) + $query_options,
 148                                 $join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) )
 149                         );
 150                 }
 151
 152                 if( count($subsql) == 0 )
 153                         return false; // should never happen
 154                 if( count($subsql) == 1 )
 155                         $sql = $subsql[0];
 156                 else {
 157                         // need to resort and relimit after union
 158                         $sql = $dbr->unionQueries($subsql, false).' ORDER BY rc_timestamp DESC';
 159                         $sql = $dbr->limitResult($sql, $limit, false);
 160                 }
 161
 162                 $res = $dbr->query( $sql, __METHOD__ );
 163
 164                 if( $res->numRows() == 0 )
 165                         $this->mResultEmpty = true;
 166
 167                 return $res;
 168         }
 169
 170         function getExtraOptions( $opts ){
 171                 $opts->consumeValues( array( 'showlinkedto', 'target' ) );
 172                 $extraOpts = array();
 173                 $extraOpts['namespace'] = $this->namespaceFilterForm( $opts );
 174                 $extraOpts['target'] = array( wfMsg( 'recentchangeslinked-page' ),
 175                         Xml::input( 'target', 40, str_replace('_',' ',$opts['target']) ) .
 176                         Xml::check( 'showlinkedto', $opts['showlinkedto'], array('id' => 'showlinkedto') ) . ' ' .
 177                         Xml::label( wfMsg("recentchangeslinked-to"), 'showlinkedto' ) );
 178                 $tagFilter = ChangeTags::buildTagFilterSelector( $opts['tagfilter'] );
 179                 if ($tagFilter)
 180                         $extraOpts['tagfilter'] = $tagFilter;
 181                 return $extraOpts;
 182         }
 183
 184         function setTopText( OutputPage $out, FormOptions $opts ) {
 185                 global $wgUser;
 186                 $skin = $wgUser->getSkin();
 187                 if( isset( $this->mTargetTitle ) && is_object( $this->mTargetTitle ) )
 188                         $out->setSubtitle( wfMsg( 'recentchangeslinked-backlink', $skin->link( $this->mTargetTitle,
 189                                 $this->mTargetTitle->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
 190         }
 191
 192         function setBottomText( OutputPage $out, FormOptions $opts ){
 193                 if( isset( $this->mTargetTitle ) && is_object( $this->mTargetTitle ) ){
 194                         $out->setFeedAppendQuery( "target=" . urlencode( $this->mTargetTitle->getPrefixedDBkey() ) );
 195                 }
 196                 if( isset( $this->mResultEmpty ) && $this->mResultEmpty ){
 197                         $out->addWikiMsg( 'recentchangeslinked-noresult' );
 198                 }
 199         }
 200 }