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<?php
/**
* Recent changes tagging.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
class ChangeTags {
/**
* Creates HTML for the given tags
*
* @param string $tags Comma-separated list of tags
* @param string $page A label for the type of action which is being displayed,
* for example: 'history', 'contributions' or 'newpages'
*
* @return Array with two items: (html, classes)
* - html: String: HTML for displaying the tags (empty string when param $tags is empty)
* - classes: Array of strings: CSS classes used in the generated html, one class for each tag
*
*/
static function formatSummaryRow( $tags, $page ) {
global $wgLang;
if( !$tags )
return array( '', array() );
$classes = array();
$tags = explode( ',', $tags );
$displayTags = array();
foreach( $tags as $tag ) {
$displayTags[] = Xml::tags(
'span',
array( 'class' => 'mw-tag-marker ' .
Sanitizer::escapeClass( "mw-tag-marker-$tag" ) ),
self::tagDescription( $tag )
);
$classes[] = Sanitizer::escapeClass( "mw-tag-$tag" );
}
$markers = wfMessage( 'parentheses' )->rawParams( $wgLang->commaList( $displayTags ) )->text();
$markers = Xml::tags( 'span', array( 'class' => 'mw-tag-markers' ), $markers );
return array( $markers, $classes );
}
/**
* Get a short description for a tag
*
* @param string $tag tag
*
* @return String: Short description of the tag from "mediawiki:tag-$tag" if this message exists,
* html-escaped version of $tag otherwise
*/
static function tagDescription( $tag ) {
$msg = wfMessage( "tag-$tag" );
return $msg->exists() ? $msg->parse() : htmlspecialchars( $tag );
}
/**
* Add tags to a change given its rc_id, rev_id and/or log_id
*
* @param string|array $tags Tags to add to the change
* @param $rc_id int: rc_id of the change to add the tags to
* @param $rev_id int: rev_id of the change to add the tags to
* @param $log_id int: log_id of the change to add the tags to
* @param string $params params to put in the ct_params field of table 'change_tag'
*
* @throws MWException
* @return bool: false if no changes are made, otherwise true
*
* @exception MWException when $rc_id, $rev_id and $log_id are all null
*/
static function addTags( $tags, $rc_id = null, $rev_id = null, $log_id = null, $params = null ) {
if ( !is_array( $tags ) ) {
$tags = array( $tags );
}
$tags = array_filter( $tags ); // Make sure we're submitting all tags...
if( !$rc_id && !$rev_id && !$log_id ) {
throw new MWException( "At least one of: RCID, revision ID, and log ID MUST be specified when adding a tag to a change!" );
}
$dbr = wfGetDB( DB_SLAVE );
// Might as well look for rcids and so on.
if( !$rc_id ) {
$dbr = wfGetDB( DB_MASTER ); // Info might be out of date, somewhat fractionally, on slave.
if( $log_id ) {
$rc_id = $dbr->selectField( 'recentchanges', 'rc_id', array( 'rc_logid' => $log_id ), __METHOD__ );
} elseif( $rev_id ) {
$rc_id = $dbr->selectField( 'recentchanges', 'rc_id', array( 'rc_this_oldid' => $rev_id ), __METHOD__ );
}
} elseif( !$log_id && !$rev_id ) {
$dbr = wfGetDB( DB_MASTER ); // Info might be out of date, somewhat fractionally, on slave.
$log_id = $dbr->selectField( 'recentchanges', 'rc_logid', array( 'rc_id' => $rc_id ), __METHOD__ );
$rev_id = $dbr->selectField( 'recentchanges', 'rc_this_oldid', array( 'rc_id' => $rc_id ), __METHOD__ );
}
$tsConds = array_filter( array( 'ts_rc_id' => $rc_id, 'ts_rev_id' => $rev_id, 'ts_log_id' => $log_id ) );
## Update the summary row.
$prevTags = $dbr->selectField( 'tag_summary', 'ts_tags', $tsConds, __METHOD__ );
$prevTags = $prevTags ? $prevTags : '';
$prevTags = array_filter( explode( ',', $prevTags ) );
$newTags = array_unique( array_merge( $prevTags, $tags ) );
sort( $prevTags );
sort( $newTags );
if ( $prevTags == $newTags ) {
// No change.
return false;
}
$dbw = wfGetDB( DB_MASTER );
$dbw->replace(
'tag_summary',
array( 'ts_rev_id', 'ts_rc_id', 'ts_log_id' ),
array_filter( array_merge( $tsConds, array( 'ts_tags' => implode( ',', $newTags ) ) ) ),
__METHOD__
);
// Insert the tags rows.
$tagsRows = array();
foreach( $tags as $tag ) { // Filter so we don't insert NULLs as zero accidentally.
$tagsRows[] = array_filter(
array(
'ct_tag' => $tag,
'ct_rc_id' => $rc_id,
'ct_log_id' => $log_id,
'ct_rev_id' => $rev_id,
'ct_params' => $params
)
);
}
$dbw->insert( 'change_tag', $tagsRows, __METHOD__, array( 'IGNORE' ) );
return true;
}
/**
* Applies all tags-related changes to a query.
* Handles selecting tags, and filtering.
* Needs $tables to be set up properly, so we can figure out which join conditions to use.
*
* @param string|array $tables Table names, see DatabaseBase::select
* @param string|array $fields Fields used in query, see DatabaseBase::select
* @param string|array $conds conditions used in query, see DatabaseBase::select
* @param $join_conds Array: join conditions, see DatabaseBase::select
* @param array $options options, see Database::select
* @param bool|string $filter_tag Tag to select on
*
* @throws MWException When unable to determine appropriate JOIN condition for tagging
*/
static function modifyDisplayQuery( &$tables, &$fields, &$conds,
&$join_conds, &$options, $filter_tag = false ) {
global $wgRequest, $wgUseTagFilter;
if( $filter_tag === false ) {
$filter_tag = $wgRequest->getVal( 'tagfilter' );
}
// Figure out which conditions can be done.
if ( in_array( 'recentchanges', $tables ) ) {
$join_cond = 'rc_id';
} elseif( in_array( 'logging', $tables ) ) {
$join_cond = 'log_id';
} elseif ( in_array( 'revision', $tables ) ) {
$join_cond = 'rev_id';
} else {
throw new MWException( 'Unable to determine appropriate JOIN condition for tagging.' );
}
// JOIN on tag_summary
$tables[] = 'tag_summary';
$join_conds['tag_summary'] = array( 'LEFT JOIN', "ts_$join_cond=$join_cond" );
$fields[] = 'ts_tags';
if( $wgUseTagFilter && $filter_tag ) {
// Somebody wants to filter on a tag.
// Add an INNER JOIN on change_tag
// FORCE INDEX -- change_tags will almost ALWAYS be the correct query plan.
global $wgOldChangeTagsIndex;
$index = $wgOldChangeTagsIndex ? 'ct_tag' : 'change_tag_tag_id';
$options['USE INDEX'] = array( 'change_tag' => $index );
unset( $options['FORCE INDEX'] );
$tables[] = 'change_tag';
$join_conds['change_tag'] = array( 'INNER JOIN', "ct_$join_cond=$join_cond" );
$conds['ct_tag'] = $filter_tag;
}
}
/**
* Build a text box to select a change tag
*
* @param string $selected tag to select by default
* @param $fullForm Boolean:
* - if false, then it returns an array of (label, form).
* - if true, it returns an entire form around the selector.
* @param $title Title object to send the form to.
* Used when, and only when $fullForm is true.
* @return String or array:
* - if $fullForm is false: Array with
* - if $fullForm is true: String, html fragment
*/
public static function buildTagFilterSelector( $selected = '', $fullForm = false, Title $title = null ) {
global $wgUseTagFilter;
if ( !$wgUseTagFilter || !count( self::listDefinedTags() ) ) {
return $fullForm ? '' : array();
}
$data = array( Html::rawElement( 'label', array( 'for' => 'tagfilter' ), wfMessage( 'tag-filter' )->parse() ),
Xml::input( 'tagfilter', 20, $selected, array( 'class' => 'mw-tagfilter-input' ) ) );
if ( !$fullForm ) {
return $data;
}
$html = implode( ' ', $data );
$html .= "\n" . Xml::element( 'input', array( 'type' => 'submit', 'value' => wfMessage( 'tag-filter-submit' )->text() ) );
$html .= "\n" . Html::hidden( 'title', $title->getPrefixedText() );
$html = Xml::tags( 'form', array( 'action' => $title->getLocalURL(), 'class' => 'mw-tagfilter-form', 'method' => 'get' ), $html );
return $html;
}
/**
* Basically lists defined tags which count even if they aren't applied to anything.
* Tags on items in table 'change_tag' which are not (or no longer) in table 'valid_tag'
* are not included.
*
* Tries memcached first.
*
* @return Array of strings: tags
*/
static function listDefinedTags() {
// Caching...
global $wgMemc;
$key = wfMemcKey( 'valid-tags' );
$tags = $wgMemc->get( $key );
if ( $tags ) {
return $tags;
}
$emptyTags = array();
// Some DB stuff
$dbr = wfGetDB( DB_SLAVE );
$res = $dbr->select( 'valid_tag', 'vt_tag', array(), __METHOD__ );
foreach ( $res as $row ) {
$emptyTags[] = $row->vt_tag;
}
wfRunHooks( 'ListDefinedTags', array( &$emptyTags ) );
$emptyTags = array_filter( array_unique( $emptyTags ) );
// Short-term caching.
$wgMemc->set( $key, $emptyTags, 300 );
return $emptyTags;
}
}