LogPager.php

Go to the documentation of this file.

<?php
class LogPager extends ReverseChronologicalPager {
        private $types = array(), $performer = '', $title = '', $pattern = '';
        private $typeCGI = '';
        public $mLogEventsList;

        public function __construct( $list, $types = array(), $performer = '', $title = '', $pattern = '',
                $conds = array(), $year = false, $month = false, $tagFilter = '' ) {
                parent::__construct( $list->getContext() );
                $this->mConds = $conds;

                $this->mLogEventsList = $list;

                $this->limitType( $types ); // also excludes hidden types
                $this->limitPerformer( $performer );
                $this->limitTitle( $title, $pattern );
                $this->getDateCond( $year, $month );
                $this->mTagFilter = $tagFilter;
        }

        public function getDefaultQuery() {
                $query = parent::getDefaultQuery();
                $query['type'] = $this->typeCGI; // arrays won't work here
                $query['user'] = $this->performer;
                $query['month'] = $this->mMonth;
                $query['year'] = $this->mYear;
                return $query;
        }

        // Call ONLY after calling $this->limitType() already!
        public function getFilterParams() {
                global $wgFilterLogTypes;
                $filters = array();
                if( count($this->types) ) {
                        return $filters;
                }
                foreach( $wgFilterLogTypes as $type => $default ) {
                        // Avoid silly filtering
                        if( $type !== 'patrol' || $this->getUser()->useNPPatrol() ) {
                                $hide = $this->getRequest()->getInt( "hide_{$type}_log", $default );
                                $filters[$type] = $hide;
                                if( $hide )
                                        $this->mConds[] = 'log_type != ' . $this->mDb->addQuotes( $type );
                        }
                }
                return $filters;
        }

        private function limitType( $types ) {
                global $wgLogRestrictions;
                // If $types is not an array, make it an array
                $types = ($types === '') ? array() : (array)$types;
                // Don't even show header for private logs; don't recognize it...
                $needReindex = false;
                foreach ( $types as $type ) {
                        if( isset( $wgLogRestrictions[$type] )
                                && !$this->getUser()->isAllowed($wgLogRestrictions[$type])
                        ) {
                                $needReindex = true;
                                $types = array_diff( $types, array( $type ) );
                        }
                }
                if ( $needReindex ) {
                        // Lots of this code makes assumptions that
                        // the first entry in the array is $types[0].
                        $types = array_values( $types );
                }
                $this->types = $types;
                // Don't show private logs to unprivileged users.
                // Also, only show them upon specific request to avoid suprises.
                $audience = $types ? 'user' : 'public';
                $hideLogs = LogEventsList::getExcludeClause( $this->mDb, $audience );
                if( $hideLogs !== false ) {
                        $this->mConds[] = $hideLogs;
                }
                if( count($types) ) {
                        $this->mConds['log_type'] = $types;
                        // Set typeCGI; used in url param for paging
                        if( count($types) == 1 ) $this->typeCGI = $types[0];
                }
        }

        private function limitPerformer( $name ) {
                if( $name == '' ) {
                        return false;
                }
                $usertitle = Title::makeTitleSafe( NS_USER, $name );
                if( is_null($usertitle) ) {
                        return false;
                }
                /* Fetch userid at first, if known, provides awesome query plan afterwards */
                $userid = User::idFromName( $name );
                if( !$userid ) {
                        /* It should be nicer to abort query at all,
                           but for now it won't pass anywhere behind the optimizer */
                        $this->mConds[] = "NULL";
                } else {
                        $this->mConds['log_user'] = $userid;
                        // Paranoia: avoid brute force searches (bug 17342)
                        $user = $this->getUser();
                        if( !$user->isAllowed( 'deletedhistory' ) ) {
                                $this->mConds[] = $this->mDb->bitAnd('log_deleted', LogPage::DELETED_USER) . ' = 0';
                        } elseif( !$user->isAllowed( 'suppressrevision' ) ) {
                                $this->mConds[] = $this->mDb->bitAnd('log_deleted', LogPage::SUPPRESSED_USER) .
                                        ' != ' . LogPage::SUPPRESSED_USER;
                        }
                        $this->performer = $usertitle->getText();
                }
        }

        private function limitTitle( $page, $pattern ) {
                global $wgMiserMode;

                if ( $page instanceof Title ) {
                        $title = $page;
                } else {
                        $title = Title::newFromText( $page );
                        if( strlen( $page ) == 0 || !$title instanceof Title ) {
                                return false;
                        }
                }

                $this->title = $title->getPrefixedText();
                $ns = $title->getNamespace();
                $db = $this->mDb;

                # Using the (log_namespace, log_title, log_timestamp) index with a
                # range scan (LIKE) on the first two parts, instead of simple equality,
                # makes it unusable for sorting.  Sorted retrieval using another index
                # would be possible, but then we might have to scan arbitrarily many
                # nodes of that index. Therefore, we need to avoid this if $wgMiserMode
                # is on.
                #
                # This is not a problem with simple title matches, because then we can
                # use the page_time index.  That should have no more than a few hundred
                # log entries for even the busiest pages, so it can be safely scanned
                # in full to satisfy an impossible condition on user or similar.
                if( $pattern && !$wgMiserMode ) {
                        $this->mConds['log_namespace'] = $ns;
                        $this->mConds[] = 'log_title ' . $db->buildLike( $title->getDBkey(), $db->anyString() );
                        $this->pattern = $pattern;
                } else {
                        $this->mConds['log_namespace'] = $ns;
                        $this->mConds['log_title'] = $title->getDBkey();
                }
                // Paranoia: avoid brute force searches (bug 17342)
                $user = $this->getUser();
                if( !$user->isAllowed( 'deletedhistory' ) ) {
                        $this->mConds[] = $db->bitAnd('log_deleted', LogPage::DELETED_ACTION) . ' = 0';
                } elseif( !$user->isAllowed( 'suppressrevision' ) ) {
                        $this->mConds[] = $db->bitAnd('log_deleted', LogPage::SUPPRESSED_ACTION) .
                                ' != ' . LogPage::SUPPRESSED_ACTION;
                }
        }

        public function getQueryInfo() {
                $basic = DatabaseLogEntry::getSelectQueryData();

                $tables = $basic['tables'];
                $fields = $basic['fields'];
                $conds = $basic['conds'];
                $options = $basic['options'];
                $joins = $basic['join_conds'];

                $index = array();
                # Add log_search table if there are conditions on it.
                # This filters the results to only include log rows that have
                # log_search records with the specified ls_field and ls_value values.
                if( array_key_exists( 'ls_field', $this->mConds ) ) {
                        $tables[] = 'log_search';
                        $index['log_search'] = 'ls_field_val';
                        $index['logging'] = 'PRIMARY';
                        if ( !$this->hasEqualsClause( 'ls_field' )
                                || !$this->hasEqualsClause( 'ls_value' ) )
                        {
                                # Since (ls_field,ls_value,ls_logid) is unique, if the condition is
                                # to match a specific (ls_field,ls_value) tuple, then there will be
                                # no duplicate log rows. Otherwise, we need to remove the duplicates.
                                $options[] = 'DISTINCT';
                        }
                # Avoid usage of the wrong index by limiting
                # the choices of available indexes. This mainly
                # avoids site-breaking filesorts.
                } elseif( $this->title || $this->pattern || $this->performer ) {
                        $index['logging'] = array( 'page_time', 'user_time' );
                        if( count($this->types) == 1 ) {
                                $index['logging'][] = 'log_user_type_time';
                        }
                } elseif( count($this->types) == 1 ) {
                        $index['logging'] = 'type_time';
                } else {
                        $index['logging'] = 'times';
                }
                $options['USE INDEX'] = $index;
                # Don't show duplicate rows when using log_search
                $joins['log_search'] = array( 'INNER JOIN', 'ls_log_id=log_id' );

                $info = array(
                        'tables'     => $tables,
                        'fields'     => $fields,
                        'conds'      => array_merge( $conds, $this->mConds ),
                        'options'    => $options,
                        'join_conds' => $joins,
                );
                # Add ChangeTags filter query
                ChangeTags::modifyDisplayQuery( $info['tables'], $info['fields'], $info['conds'],
                        $info['join_conds'], $info['options'], $this->mTagFilter );
                return $info;
        }

        protected function hasEqualsClause( $field ) {
                return (
                        array_key_exists( $field, $this->mConds ) &&
                        ( !is_array( $this->mConds[$field] ) || count( $this->mConds[$field] ) == 1 )
                );
        }

        function getIndexField() {
                return 'log_timestamp';
        }

        public function getStartBody() {
                wfProfileIn( __METHOD__ );
                # Do a link batch query
                if( $this->getNumRows() > 0 ) {
                        $lb = new LinkBatch;
                        foreach ( $this->mResult as $row ) {
                                $lb->add( $row->log_namespace, $row->log_title );
                                $lb->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
                                $lb->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );
                                $formatter = LogFormatter::newFromRow( $row );
                                foreach ( $formatter->getPreloadTitles() as $title ) {
                                        $lb->addObj( $title );
                                }
                        }
                        $lb->execute();
                        $this->mResult->seek( 0 );
                }
                wfProfileOut( __METHOD__ );
                return '';
        }

        public function formatRow( $row ) {
                return $this->mLogEventsList->logLine( $row );
        }

        public function getType() {
                return $this->types;
        }

        public function getPerformer() {
                return $this->performer;
        }

        public function getPage() {
                return $this->title;
        }

        public function getPattern() {
                return $this->pattern;
        }

        public function getYear() {
                return $this->mYear;
        }

        public function getMonth() {
                return $this->mMonth;
        }

        public function getTagFilter() {
                return $this->mTagFilter;
        }

        public function doQuery() {
                // Workaround MySQL optimizer bug
                $this->mDb->setBigSelects();
                parent::doQuery();
                $this->mDb->setBigSelects( 'default' );
        }
}