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                 $opts->add( 'tagfilter', '' );
  41                 return $opts;
  42         }
  43
  44         public function parseParameters( $par, FormOptions $opts ) {
  45                 $opts['target'] = $par;
  46         }
  47
  48         public function feedSetup() {
  49                 $opts = parent::feedSetup();
  50                 $opts['target'] = $this->getRequest()->getVal( 'target' );
  51                 return $opts;
  52         }
  53
  54         public function getFeedObject( $feedFormat ){
  55                 $feed = new ChangesFeed( $feedFormat, false );
  56                 $feedObj = $feed->getFeedObject(
  57                         wfMsgForContent( 'recentchangeslinked-title', $this->getTargetTitle()->getPrefixedText() ),
  58                         wfMsgForContent( 'recentchangeslinked-feed' ),
  59                         $this->getTitle()->getFullUrl()
  60                 );
  61                 return array( $feed, $feedObj );
  62         }
  63
  64         public function doMainQuery( $conds, $opts ) {
  65                 $target = $opts['target'];
  66                 $showlinkedto = $opts['showlinkedto'];
  67                 $limit = $opts['limit'];
  68
  69                 if ( $target === '' ) {
  70                         return false;
  71                 }
  72                 $title = Title::newFromURL( $target );
  73                 if( !$title || $title->getInterwiki() != '' ){
  74                         $this->getOutput()->wrapWikiMsg( "<div class=\"errorbox\">\n$1\n</div><br style=\"clear: both\" />", 'allpagesbadtitle' );
  75                         return false;
  76                 }
  77
  78                 $this->getOutput()->setPageTitle( wfMsg( 'recentchangeslinked-title', $title->getPrefixedText() ) );
  79
  80                 /*
  81                  * Ordinary links are in the pagelinks table, while transclusions are
  82                  * in the templatelinks table, categorizations in categorylinks and
  83                  * image use in imagelinks.  We need to somehow combine all these.
  84                  * Special:Whatlinkshere does this by firing multiple queries and
  85                  * merging the results, but the code we inherit from our parent class
  86                  * expects only one result set so we use UNION instead.
  87                  */
  88
  89                 $dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
  90                 $id = $title->getArticleId();
  91                 $ns = $title->getNamespace();
  92                 $dbkey = $title->getDBkey();
  93
  94                 $tables = array( 'recentchanges' );
  95                 $select = array( $dbr->tableName( 'recentchanges' ) . '.*' );
  96                 $join_conds = array();
  97                 $query_options = array();
  98
  99                 // left join with watchlist table to highlight watched rows
 100                 $uid = $this->getUser()->getId();
 101                 if( $uid ) {
 102                         $tables[] = 'watchlist';
 103                         $select[] = 'wl_user';
 104                         $join_conds['watchlist'] = array( 'LEFT JOIN', "wl_user={$uid} AND wl_title=rc_title AND wl_namespace=rc_namespace" );
 105                 }
 106                 if ( $this->getUser()->isAllowed( 'rollback' ) ) {
 107                         $tables[] = 'page';
 108                         $join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
 109                         $select[] = 'page_latest';
 110                 }
 111                 if ( !$this->including() ) { // bug 23293
 112                         ChangeTags::modifyDisplayQuery( $tables, $select, $conds, $join_conds,
 113                                 $query_options, $opts['tagfilter'] );
 114                 }
 115
 116                 if ( !wfRunHooks( 'SpecialRecentChangesQuery', array( &$conds, &$tables, &$join_conds, $opts, &$query_options, &$select ) ) )
 117                         return false;
 118
 119                 if( $ns == NS_CATEGORY && !$showlinkedto ) {
 120                         // special handling for categories
 121                         // XXX: should try to make this less klugy
 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 ) $link_tables[] = 'imagelinks';
 129                 }
 130
 131                 if( $id == 0 && !$showlinkedto )
 132                         return false; // nonexistent pages can't link to any pages
 133
 134                 // field name prefixes for all the various tables we might want to join with
 135                 $prefix = array( 'pagelinks' => 'pl', 'templatelinks' => 'tl', 'categorylinks' => 'cl', 'imagelinks' => 'il' );
 136
 137                 $subsql = array(); // SELECT statements to combine with UNION
 138
 139                 foreach( $link_tables as $link_table ) {
 140                         $pfx = $prefix[$link_table];
 141
 142                         // imagelinks and categorylinks tables have no xx_namespace field, and have xx_to instead of xx_title
 143                         if( $link_table == 'imagelinks' ) $link_ns = NS_FILE;
 144                         elseif( $link_table == 'categorylinks' ) $link_ns = NS_CATEGORY;
 145                         else $link_ns = 0;
 146
 147                         if( $showlinkedto ) {
 148                                 // find changes to pages linking to this page
 149                                 if( $link_ns ) {
 150                                         if( $ns != $link_ns ) continue; // should never happen, but check anyway
 151                                         $subconds = array( "{$pfx}_to" => $dbkey );
 152                                 } else {
 153                                         $subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
 154                                 }
 155                                 $subjoin = "rc_cur_id = {$pfx}_from";
 156                         } else {
 157                                 // find changes to pages linked from this page
 158                                 $subconds = array( "{$pfx}_from" => $id );
 159                                 if( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
 160                                         $subconds["rc_namespace"] = $link_ns;
 161                                         $subjoin = "rc_title = {$pfx}_to";
 162                                 } else {
 163                                         $subjoin = "rc_namespace = {$pfx}_namespace AND rc_title = {$pfx}_title";
 164                                 }
 165                         }
 166
 167                         if( $dbr->unionSupportsOrderAndLimit())
 168                                 $order = array( 'ORDER BY' => 'rc_timestamp DESC' );
 169                         else
 170                                 $order = array();
 171
 172
 173                         $query = $dbr->selectSQLText(
 174                                 array_merge( $tables, array( $link_table ) ),
 175                                 $select,
 176                                 $conds + $subconds,
 177                                 __METHOD__,
 178                                 $order + $query_options,
 179                                 $join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) )
 180                         );
 181
 182                         if( $dbr->unionSupportsOrderAndLimit())
 183                                 $query = $dbr->limitResult( $query, $limit );
 184
 185                         $subsql[] = $query;
 186                 }
 187
 188                 if( count($subsql) == 0 )
 189                         return false; // should never happen
 190                 if( count($subsql) == 1 && $dbr->unionSupportsOrderAndLimit() )
 191                         $sql = $subsql[0];
 192                 else {
 193                         // need to resort and relimit after union
 194                         $sql = $dbr->unionQueries($subsql, false).' ORDER BY rc_timestamp DESC';
 195                         $sql = $dbr->limitResult($sql, $limit, false);
 196                 }
 197
 198                 $res = $dbr->query( $sql, __METHOD__ );
 199
 200                 if( $res->numRows() == 0 )
 201                         $this->mResultEmpty = true;
 202
 203                 return $res;
 204         }
 205
 206         function getExtraOptions( $opts ){
 207                 $opts->consumeValues( array( 'showlinkedto', 'target', 'tagfilter' ) );
 208                 $extraOpts = array();
 209                 $extraOpts['namespace'] = $this->namespaceFilterForm( $opts );
 210                 $extraOpts['target'] = array( wfMsgHtml( 'recentchangeslinked-page' ),
 211                         Xml::input( 'target', 40, str_replace('_',' ',$opts['target']) ) .
 212                         Xml::check( 'showlinkedto', $opts['showlinkedto'], array('id' => 'showlinkedto') ) . ' ' .
 213                         Xml::label( wfMsg("recentchangeslinked-to"), 'showlinkedto' ) );
 214                 $tagFilter = ChangeTags::buildTagFilterSelector( $opts['tagfilter'] );
 215                 if ($tagFilter)
 216                         $extraOpts['tagfilter'] = $tagFilter;
 217                 return $extraOpts;
 218         }
 219
 220         /**
 221          * @return Title
 222          */
 223         function getTargetTitle() {
 224                 if ( $this->rclTargetTitle === null ) {
 225                         $opts = $this->getOptions();
 226                         if ( isset( $opts['target'] ) && $opts['target'] !== '' ) {
 227                                 $this->rclTargetTitle = Title::newFromText( $opts['target'] );
 228                         } else {
 229                                 $this->rclTargetTitle = false;
 230                         }
 231                 }
 232                 return $this->rclTargetTitle;
 233         }
 234
 235         function setTopText( FormOptions $opts ) {
 236                 $target = $this->getTargetTitle();
 237                 if( $target ) {
 238                         $this->getOutput()->setSubtitle( wfMsg( 'recentchangeslinked-backlink', Linker::link( $target,
 239                                 $target->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
 240                 }
 241         }
 242
 243         public function getFeedQuery() {
 244                 $target = $this->getTargetTitle();
 245                 if( $target ) {
 246                         return "target=" . urlencode( $target->getPrefixedDBkey() );
 247                 } else {
 248                         return false;
 249                 }
 250         }
 251
 252         function setBottomText( FormOptions $opts ) {
 253                 if( isset( $this->mResultEmpty ) && $this->mResultEmpty ) {
 254                         $this->getOutput()->addWikiMsg( 'recentchangeslinked-noresult' );
 255                 }
 256         }
 257 }