includes/ChangeTags.php

   1 <?php
   2
   3 if( !defined( 'MEDIAWIKI' ) )
   4         die;
   5
   6 class ChangeTags {
   7         static function formatSummaryRow( $tags, $page ) {
   8                 if( !$tags )
   9                         return array( '', array() );
  10
  11                 $classes = array();
  12
  13                 $tags = explode( ',', $tags );
  14                 $displayTags = array();
  15                 foreach( $tags as $tag ) {
  16                         $displayTags[] = Xml::tags(
  17                                 'span',
  18                                 array( 'class' => 'mw-tag-marker ' .
  19                                                                 Sanitizer::escapeClass( "mw-tag-marker-$tag" ) ),
  20                                 self::tagDescription( $tag )
  21                         );
  22                         $classes[] = Sanitizer::escapeClass( "mw-tag-$tag" );
  23                 }
  24
  25                 $markers = '(' . implode( ', ', $displayTags ) . ')';
  26                 $markers = Xml::tags( 'span', array( 'class' => 'mw-tag-markers' ), $markers );
  27                 return array( $markers, $classes );
  28         }
  29
  30         static function tagDescription( $tag ) {
  31                 $msg = wfMsgExt( "tag-$tag", 'parseinline' );
  32                 if ( wfEmptyMsg( "tag-$tag", $msg ) ) {
  33                         return htmlspecialchars( $tag );
  34                 }
  35                 return $msg;
  36         }
  37
  38         ## Basic utility method to add tags to a particular change, given its rc_id, rev_id and/or log_id.
  39         static function addTags( $tags, $rc_id = null, $rev_id = null, $log_id = null, $params = null ) {
  40                 if ( !is_array( $tags ) ) {
  41                         $tags = array( $tags );
  42                 }
  43
  44                 $tags = array_filter( $tags ); // Make sure we're submitting all tags...
  45
  46                 if( !$rc_id && !$rev_id && !$log_id ) {
  47                         throw new MWException( "At least one of: RCID, revision ID, and log ID MUST be specified when adding a tag to a change!" );
  48                 }
  49
  50                 $dbr = wfGetDB( DB_SLAVE );
  51
  52                 // Might as well look for rcids and so on.
  53                 if( !$rc_id ) {
  54                         $dbr = wfGetDB( DB_MASTER ); // Info might be out of date, somewhat fractionally, on slave.
  55                         if( $log_id ) {
  56                                 $rc_id = $dbr->selectField( 'recentchanges', 'rc_id', array( 'rc_logid' => $log_id ), __METHOD__ );
  57                         } elseif( $rev_id ) {
  58                                 $rc_id = $dbr->selectField( 'recentchanges', 'rc_id', array( 'rc_this_oldid' => $rev_id ), __METHOD__ );
  59                         }
  60                 } elseif( !$log_id && !$rev_id ) {
  61                         $dbr = wfGetDB( DB_MASTER ); // Info might be out of date, somewhat fractionally, on slave.
  62                         $log_id = $dbr->selectField( 'recentchanges', 'rc_logid', array( 'rc_id' => $rc_id ), __METHOD__ );
  63                         $rev_id = $dbr->selectField( 'recentchanges', 'rc_this_oldid', array( 'rc_id' => $rc_id ), __METHOD__ );
  64                 }
  65
  66                 $tsConds = array_filter( array( 'ts_rc_id' => $rc_id, 'ts_rev_id' => $rev_id, 'ts_log_id' => $log_id ) );
  67
  68                 ## Update the summary row.
  69                 $prevTags = $dbr->selectField( 'tag_summary', 'ts_tags', $tsConds, __METHOD__ );
  70                 $prevTags = $prevTags ? $prevTags : '';
  71                 $prevTags = array_filter( explode( ',', $prevTags ) );
  72                 $newTags = array_unique( array_merge( $prevTags, $tags ) );
  73                 sort( $prevTags );
  74                 sort( $newTags );
  75
  76                 if ( $prevTags == $newTags ) {
  77                         // No change.
  78                         return false;
  79                 }
  80
  81                 $dbw = wfGetDB( DB_MASTER );
  82                 $dbw->replace(
  83                         'tag_summary',
  84                         array( 'ts_rev_id', 'ts_rc_id', 'ts_log_id' ),
  85                         array_filter( array_merge( $tsConds, array( 'ts_tags' => implode( ',', $newTags ) ) ) ),
  86                         __METHOD__
  87                 );
  88
  89                 // Insert the tags rows.
  90                 $tagsRows = array();
  91                 foreach( $tags as $tag ) { // Filter so we don't insert NULLs as zero accidentally.
  92                         $tagsRows[] = array_filter(
  93                                 array(
  94                                         'ct_tag' => $tag,
  95                                         'ct_rc_id' => $rc_id,
  96                                         'ct_log_id' => $log_id,
  97                                         'ct_rev_id' => $rev_id,
  98                                         'ct_params' => $params
  99                                 )
 100                         );
 101                 }
 102
 103                 $dbw->insert( 'change_tag', $tagsRows, __METHOD__, array( 'IGNORE' ) );
 104
 105                 return true;
 106         }
 107
 108         /**
 109          * Applies all tags-related changes to a query.
 110          * Handles selecting tags, and filtering.
 111          * Needs $tables to be set up properly, so we can figure out which join conditions to use.
 112          */
 113         static function modifyDisplayQuery( &$tables, &$fields,  &$conds,
 114                                                                                 &$join_conds, &$options, $filter_tag = false ) {
 115                 global $wgRequest, $wgUseTagFilter;
 116
 117                 if( $filter_tag === false ) {
 118                         $filter_tag = $wgRequest->getVal( 'tagfilter' );
 119                 }
 120
 121                 // Figure out which conditions can be done.
 122                 if ( in_array( 'recentchanges', $tables ) ) {
 123                         $join_cond = 'rc_id';
 124                 } elseif( in_array( 'logging', $tables ) ) {
 125                         $join_cond = 'log_id';
 126                 } elseif ( in_array( 'revision', $tables ) ) {
 127                         $join_cond = 'rev_id';
 128                 } else {
 129                         throw new MWException( 'Unable to determine appropriate JOIN condition for tagging.' );
 130                 }
 131
 132                 // JOIN on tag_summary
 133                 $tables[] = 'tag_summary';
 134                 $join_conds['tag_summary'] = array( 'LEFT JOIN', "ts_$join_cond=$join_cond" );
 135                 $fields[] = 'ts_tags';
 136
 137                 if( $wgUseTagFilter && $filter_tag ) {
 138                         // Somebody wants to filter on a tag.
 139                         // Add an INNER JOIN on change_tag
 140
 141                         // FORCE INDEX -- change_tags will almost ALWAYS be the correct query plan.
 142                         global $wgOldChangeTagsIndex;
 143                         $index = $wgOldChangeTagsIndex ? 'ct_tag' : 'change_tag_tag_id';
 144                         $options['USE INDEX'] = array( 'change_tag' => $index );
 145                         unset( $options['FORCE INDEX'] );
 146                         $tables[] = 'change_tag';
 147                         $join_conds['change_tag'] = array( 'INNER JOIN', "ct_$join_cond=$join_cond" );
 148                         $conds['ct_tag'] = $filter_tag;
 149                 }
 150         }
 151
 152         /**
 153          * If $fullForm is set to false, then it returns an array of (label, form).
 154          * If $fullForm is true, it returns an entire form.
 155          */
 156         static function buildTagFilterSelector( $selected='', $fullForm = false /* used to put a full form around the selector */ ) {
 157                 global $wgUseTagFilter;
 158
 159                 if ( !$wgUseTagFilter || !count( self::listDefinedTags() ) )
 160                         return $fullForm ? '' : array();
 161
 162                 global $wgTitle;
 163
 164                 $data = array( wfMsgExt( 'tag-filter', 'parseinline' ), Xml::input( 'tagfilter', 20, $selected ) );
 165
 166                 if ( !$fullForm ) {
 167                         return $data;
 168                 }
 169
 170                 $html = implode( '&#160;', $data );
 171                 $html .= "\n" . Xml::element( 'input', array( 'type' => 'submit', 'value' => wfMsg( 'tag-filter-submit' ) ) );
 172                 $html .= "\n" . Xml::hidden( 'title', $wgTitle-> getPrefixedText() );
 173                 $html = Xml::tags( 'form', array( 'action' => $wgTitle->getLocalURL(), 'method' => 'get' ), $html );
 174
 175                 return $html;
 176         }
 177
 178         /** Basically lists defined tags which count even if they aren't applied to anything */
 179         static function listDefinedTags() {
 180                 // Caching...
 181                 global $wgMemc;
 182                 $key = wfMemcKey( 'valid-tags' );
 183
 184                 if ( $tags = $wgMemc->get( $key ) )
 185                         return $tags;
 186
 187                 $emptyTags = array();
 188
 189                 // Some DB stuff
 190                 $dbr = wfGetDB( DB_SLAVE );
 191                 $res = $dbr->select( 'valid_tag', 'vt_tag', array(), __METHOD__ );
 192                 while( $row = $res->fetchObject() ) {
 193                         $emptyTags[] = $row->vt_tag;
 194                 }
 195
 196                 wfRunHooks( 'ListDefinedTags', array( &$emptyTags ) );
 197
 198                 $emptyTags = array_filter( array_unique( $emptyTags ) );
 199
 200                 // Short-term caching.
 201                 $wgMemc->set( $key, $emptyTags, 300 );
 202                 return $emptyTags;
 203         }
 204 }