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  51                         $dbr = wfGetDB( DB_MASTER ); // Info might be out of date, somewhat fractionally, on slave.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  58                         $dbr = wfGetDB( DB_MASTER ); // Info might be out of date, somewhat fractionally, on slave.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