Patched jquery-1.4.2 to not crash in IE7 when a style property is set with 'null...

[mediawiki.git] / includes / LogEventsList.php

<?php
# Copyright (C) 2004 Brion Vibber <brion@pobox.com>, 2008 Aaron Schulz
# http://www.mediawiki.org/
#
# 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

class LogEventsList {
        const NO_ACTION_LINK = 1;
        const NO_EXTRA_USER_LINKS = 2;

        private $skin;
        private $out;
        public $flags;

        public function __construct( $skin, $out, $flags = 0 ) {
                $this->skin = $skin;
                $this->out = $out;
                $this->flags = $flags;
                $this->preCacheMessages();
        }

        /**
         * As we use the same small set of messages in various methods and that
         * they are called often, we call them once and save them in $this->message
         */
        private function preCacheMessages() {
                // Precache various messages
                if( !isset( $this->message ) ) {
                        $messages = array( 'revertmerge', 'protect_change', 'unblocklink', 'change-blocklink',
                                'revertmove', 'undeletelink', 'undeleteviewlink', 'revdel-restore', 'hist', 'diff',
                                'pipe-separator' );
                        foreach( $messages as $msg ) {
                                $this->message[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
                        }
                }
        }

        /**
         * Set page title and show header for this log type
         * @param $type Array
         */
        public function showHeader( $type ) {
                // If only one log type is used, then show a special message...
                $headerType = (count($type) == 1) ? $type[0] : '';
                if( LogPage::isLogType( $headerType ) ) {
                        $this->out->setPageTitle( LogPage::logName( $headerType ) );
                        $this->out->addHTML( LogPage::logHeader( $headerType ) );
                } else {
                        $this->out->addHTML( wfMsgExt('alllogstext',array('parseinline')) );
                }
        }

        /**
         * Show options for the log list
         * @param $types string or Array
         * @param $user String
         * @param $page String
         * @param $pattern String
         * @param $year Integer: year
         * @param $month Integer: month
         * @param $filter: array
         * @param $tagFilter: array?
         */
        public function showOptions( $types=array(), $user='', $page='', $pattern='', $year='', 
                $month = '', $filter = null, $tagFilter='' )
        {
                global $wgScript, $wgMiserMode;

                $action = $wgScript;
                $title = SpecialPage::getTitleFor( 'Log' );
                $special = $title->getPrefixedDBkey();

                // For B/C, we take strings, but make sure they are converted...
                $types = ($types === '') ? array() : (array)$types;

                $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );

                $html = '';
                $html .= Xml::hidden( 'title', $special );

                // Basic selectors
                $html .= $this->getTypeMenu( $types ) . "\n";
                $html .= $this->getUserInput( $user ) . "\n";
                $html .= $this->getTitleInput( $page ) . "\n";
                $html .= $this->getExtraInputs( $types ) . "\n";

                // Title pattern, if allowed
                if (!$wgMiserMode) {
                        $html .= $this->getTitlePattern( $pattern ) . "\n";
                }

                // date menu
                $html .= Xml::tags( 'p', null, Xml::dateMenu( $year, $month ) );

                // Tag filter
                if ($tagSelector) {
                        $html .= Xml::tags( 'p', null, implode( '&nbsp;', $tagSelector ) );
                }

                // Filter links
                if ($filter) {
                        $html .= Xml::tags( 'p', null, $this->getFilterLinks( $filter ) );
                }

                // Submit button
                $html .= Xml::submitButton( wfMsg( 'allpagessubmit' ) );

                // Fieldset
                $html = Xml::fieldset( wfMsg( 'log' ), $html );

                // Form wrapping
                $html = Xml::tags( 'form', array( 'action' => $action, 'method' => 'get' ), $html );

                $this->out->addHTML( $html );
        }

        /**
         * @param $filter Array
         * @return String: Formatted HTML
         */
        private function getFilterLinks( $filter ) {
                global $wgTitle, $wgLang;
                // show/hide links
                $messages = array( wfMsgHtml( 'show' ), wfMsgHtml( 'hide' ) );
                // Option value -> message mapping
                $links = array();
                $hiddens = ''; // keep track for "go" button
                foreach( $filter as $type => $val ) {
                        // Should the below assignment be outside the foreach?
                        // Then it would have to be copied. Not certain what is more expensive.
                        $query = $this->getDefaultQuery();
                        $queryKey = "hide_{$type}_log";

                        $hideVal = 1 - intval($val);
                        $query[$queryKey] = $hideVal;

                        $link = $this->skin->link(
                                $wgTitle,
                                $messages[$hideVal],
                                array(),
                                $query,
                                array( 'known', 'noclasses' )
                        );

                        $links[$type] = wfMsgHtml( "log-show-hide-{$type}", $link );
                        $hiddens .= Xml::hidden( "hide_{$type}_log", $val ) . "\n";
                }
                // Build links
                return '<small>'.$wgLang->pipeList( $links ) . '</small>' . $hiddens;
        }

        private function getDefaultQuery() {
                if ( !isset( $this->mDefaultQuery ) ) {
                        $this->mDefaultQuery = $_GET;
                        unset( $this->mDefaultQuery['title'] );
                        unset( $this->mDefaultQuery['dir'] );
                        unset( $this->mDefaultQuery['offset'] );
                        unset( $this->mDefaultQuery['limit'] );
                        unset( $this->mDefaultQuery['order'] );
                        unset( $this->mDefaultQuery['month'] );
                        unset( $this->mDefaultQuery['year'] );
                }
                return $this->mDefaultQuery;
        }

        /**
         * @param $queryTypes Array
         * @return String: Formatted HTML
         */
        private function getTypeMenu( $queryTypes ) {
                global $wgLogRestrictions, $wgUser;

                $html = "<select name='type'>\n";

                $validTypes = LogPage::validTypes();
                $typesByName = array(); // Temporary array

                // First pass to load the log names
                foreach( $validTypes as $type ) {
                        $text = LogPage::logName( $type );
                        $typesByName[$type] = $text;
                }

                // Second pass to sort by name
                asort($typesByName);

                // Note the query type
                $queryType = count($queryTypes) == 1 ? $queryTypes[0] : '';

                // Always put "All public logs" on top
                if ( isset( $typesByName[''] ) ) {
                        $all = $typesByName[''];
                        unset( $typesByName[''] );
                        $typesByName = array( '' => $all ) + $typesByName;
                }

                // Third pass generates sorted XHTML content
                foreach( $typesByName as $type => $text ) {
                        $selected = ($type == $queryType);
                        // Restricted types
                        if ( isset($wgLogRestrictions[$type]) ) {
                                if ( $wgUser->isAllowed( $wgLogRestrictions[$type] ) ) {
                                        $html .= Xml::option( $text, $type, $selected ) . "\n";
                                }
                        } else {
                                $html .= Xml::option( $text, $type, $selected ) . "\n";
                        }
                }

                $html .= '</select>';
                return $html;
        }

        /**
         * @param $user String
         * @return String: Formatted HTML
         */
        private function getUserInput( $user ) {
                return '<span style="white-space: nowrap">' .
                        Xml::inputLabel( wfMsg( 'specialloguserlabel' ), 'user', 'mw-log-user', 15, $user ) .
                        '</span>';
        }

        /**
         * @param $title String
         * @return String: Formatted HTML
         */
        private function getTitleInput( $title ) {
                return '<span style="white-space: nowrap">' .
                        Xml::inputLabel( wfMsg( 'speciallogtitlelabel' ), 'page', 'mw-log-page', 20, $title ) .
                        '</span>';
        }

        /**
         * @return boolean Checkbox
         */
        private function getTitlePattern( $pattern ) {
                return '<span style="white-space: nowrap">' .
                        Xml::checkLabel( wfMsg( 'log-title-wildcard' ), 'pattern', 'pattern', $pattern ) .
                        '</span>';
        }

        private function getExtraInputs( $types ) {
                global $wgRequest;
                $offender = $wgRequest->getVal('offender');
                $user = User::newFromName( $offender, false );
                if( !$user || ($user->getId() == 0 && !IP::isIPAddress($offender) ) ) {
                        $offender = ''; // Blank field if invalid
                }
                if( count($types) == 1 && $types[0] == 'suppress' ) {
                        return Xml::inputLabel( wfMsg('revdelete-offender'), 'offender',
                                'mw-log-offender', 20, $offender );
                }
                return '';
        }

        public function beginLogEventsList() {
                return "<ul>\n";
        }

        public function endLogEventsList() {
                return "</ul>\n";
        }

        /**
         * @param $row Row: a single row from the result set
         * @return String: Formatted HTML list item
         */
        public function logLine( $row ) {
                $classes = array( 'mw-logline-' . $row->log_type );
                $title = Title::makeTitle( $row->log_namespace, $row->log_title );
                // Log time
                $time = $this->logTimestamp( $row );
                // User links
                $userLink = $this->logUserLinks( $row );
                // Extract extra parameters
                $paramArray = LogPage::extractParams( $row->log_params );
                // Event description
                $action = $this->logAction( $row, $title, $paramArray );
                // Log comment
                $comment = $this->logComment( $row );
                // Add review/revert links and such...
                $revert = $this->logActionLinks( $row, $title, $paramArray, $comment );

                // Some user can hide log items and have review links
                $del = $this->getShowHideLinks( $row );
                if( $del != '' ) $del .= ' ';

                // Any tags...
                list( $tagDisplay, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'logevent' );
                $classes = array_merge( $classes, $newClasses );

                return Xml::tags( 'li', array( "class" => implode( ' ', $classes ) ),
                        $del . "$time $userLink $action $comment $revert $tagDisplay" ) . "\n";
        }
        
        private function logTimestamp( $row ) {
                global $wgLang;
                $time = $wgLang->timeanddate( wfTimestamp( TS_MW, $row->log_timestamp ), true );
                return htmlspecialchars( $time );
        }

        private function logUserLinks( $row ) {
                $userLinks = '';
                if( self::isDeleted( $row, LogPage::DELETED_USER ) ) {
                        $userLinks = '<span class="history-deleted">' .
                                wfMsgHtml( 'rev-deleted-user' ) . '</span>';
                } else {
                        $userLinks = $this->skin->userLink( $row->log_user, $row->user_name );
                        // Talk|Contribs links...
                        if( !( $this->flags & self::NO_EXTRA_USER_LINKS ) ) {
                                $userLinks .= $this->skin->userToolLinks(
                                        $row->log_user, $row->user_name, true, 0, $row->user_editcount );
                        }
                }
                return $userLinks;
        }

        private function logAction( $row, $title, $paramArray ) {
                $action = '';
                if( self::isDeleted( $row, LogPage::DELETED_ACTION ) ) {
                        $action = '<span class="history-deleted">' .
                                wfMsgHtml( 'rev-deleted-event' ) . '</span>';
                } else {
                        $action = LogPage::actionText(
                                $row->log_type, $row->log_action, $title, $this->skin, $paramArray, true );
                }
                return $action;
        }
        
        private function logComment( $row ) {
                global $wgContLang;
                $comment = '';
                if( self::isDeleted( $row, LogPage::DELETED_COMMENT ) ) {
                        $comment = '<span class="history-deleted">' .
                                wfMsgHtml( 'rev-deleted-comment' ) . '</span>';
                } else {
                        $comment = $wgContLang->getDirMark() .
                                $this->skin->commentBlock( $row->log_comment );
                }
                return $comment;
        }

        // @TODO: split up!
        private function logActionLinks( $row, $title, $paramArray, &$comment ) {
                global $wgUser, $wgLang;
                if( ( $this->flags & self::NO_ACTION_LINK ) // we don't want to see the action
                        || self::isDeleted( $row, LogPage::DELETED_ACTION ) ) // action is hidden
                {
                        return '';
                }
                $revert = '';
                if( self::typeAction( $row, 'move', 'move', 'move' ) && !empty( $paramArray[0] ) ) {
                        $destTitle = Title::newFromText( $paramArray[0] );
                        if( $destTitle ) {
                                $revert = '(' . $this->skin->link(
                                        SpecialPage::getTitleFor( 'Movepage' ),
                                        $this->message['revertmove'],
                                        array(),
                                        array(
                                                'wpOldTitle' => $destTitle->getPrefixedDBkey(),
                                                'wpNewTitle' => $title->getPrefixedDBkey(),
                                                'wpReason'   => wfMsgForContent( 'revertmove' ),
                                                'wpMovetalk' => 0
                                        ),
                                        array( 'known', 'noclasses' )
                                ) . ')';
                        }
                // Show undelete link
                } else if( self::typeAction( $row, array( 'delete', 'suppress' ), 'delete', 'deletedhistory' ) ) {
                        if( !$wgUser->isAllowed( 'undelete' ) ) {
                                $viewdeleted = $this->message['undeleteviewlink'];
                        } else {
                                $viewdeleted = $this->message['undeletelink'];
                        }
                        $revert = '(' . $this->skin->link(
                                SpecialPage::getTitleFor( 'Undelete' ),
                                $viewdeleted,
                                array(),
                                array( 'target' => $title->getPrefixedDBkey() ),
                                array( 'known', 'noclasses' )
                         ) . ')';
                // Show unblock/change block link
                } else if( self::typeAction( $row, array( 'block', 'suppress' ), array( 'block', 'reblock' ), 'block' ) ) {
                        $revert = '(' .
                                $this->skin->link(
                                        SpecialPage::getTitleFor( 'Ipblocklist' ),
                                        $this->message['unblocklink'],
                                        array(),
                                        array(
                                                'action' => 'unblock',
                                                'ip' => $row->log_title
                                        ),
                                        'known'
                                ) .
                                $this->message['pipe-separator'] .
                                $this->skin->link(
                                        SpecialPage::getTitleFor( 'Blockip', $row->log_title ),
                                        $this->message['change-blocklink'],
                                        array(),
                                        array(),
                                        'known'
                                ) .
                                ')';
                // Show change protection link
                } else if( self::typeAction( $row, 'protect', array( 'modify', 'protect', 'unprotect' ) ) ) {
                        $revert .= ' (' .
                                $this->skin->link( $title,
                                        $this->message['hist'],
                                        array(),
                                        array(
                                                'action' => 'history',
                                                'offset' => $row->log_timestamp
                                        )
                                );
                        if( $wgUser->isAllowed( 'protect' ) ) {
                                $revert .= $this->message['pipe-separator'] .
                                        $this->skin->link( $title,
                                                $this->message['protect_change'],
                                                array(),
                                                array( 'action' => 'protect' ),
                                                'known' );
                        }
                        $revert .= ')';
                // Show unmerge link
                } else if( self::typeAction( $row, 'merge', 'merge', 'mergehistory' ) ) {
                        $revert = '(' . $this->skin->link(
                                SpecialPage::getTitleFor( 'MergeHistory' ),
                                $this->message['revertmerge'],
                                array(),
                                array(
                                        'target' => $paramArray[0],
                                        'dest' => $title->getPrefixedDBkey(),
                                        'mergepoint' => $paramArray[1]
                                ),
                                array( 'known', 'noclasses' )
                        ) . ')';
                // If an edit was hidden from a page give a review link to the history
                } else if( self::typeAction( $row, array( 'delete', 'suppress' ), 'revision', 'deletedhistory' ) ) {
                        if( count($paramArray) >= 2 ) {
                                // Different revision types use different URL params...
                                $key = $paramArray[0];
                                // $paramArray[1] is a CSV of the IDs
                                $Ids = explode( ',', $paramArray[1] );
                                $query = $paramArray[1];
                                $revert = array();
                                // Diff link for single rev deletions
                                if( count($Ids) == 1 ) {
                                        // Live revision diffs...
                                        if( in_array( $key, array( 'oldid', 'revision' ) ) ) {
                                                $revert[] = $this->skin->link(
                                                        $title,
                                                        $this->message['diff'],
                                                        array(),
                                                        array(
                                                                'diff' => intval( $Ids[0] ),
                                                                'unhide' => 1
                                                        ),
                                                        array( 'known', 'noclasses' )
                                                );
                                        // Deleted revision diffs...
                                        } else if( in_array( $key, array( 'artimestamp','archive' ) ) ) {
                                                $revert[] = $this->skin->link(
                                                        SpecialPage::getTitleFor( 'Undelete' ),
                                                        $this->message['diff'], 
                                                        array(),
                                                        array(
                                                                'target'    => $title->getPrefixedDBKey(),
                                                                'diff'      => 'prev',
                                                                'timestamp' => $Ids[0]
                                                        ),
                                                        array( 'known', 'noclasses' )
                                                );
                                        }
                                }
                                // View/modify link...
                                $revert[] = $this->skin->link(
                                        SpecialPage::getTitleFor( 'Revisiondelete' ),
                                        $this->message['revdel-restore'],
                                        array(),
                                        array(
                                                'target' => $title->getPrefixedText(),
                                                'type' => $key,
                                                'ids' => $query
                                        ),
                                        array( 'known', 'noclasses' )
                                );
                                // Pipe links
                                $revert = wfMsg( 'parentheses', $wgLang->pipeList( $revert ) );
                        }
                // Hidden log items, give review link
                } else if( self::typeAction( $row, array( 'delete', 'suppress' ), 'event', 'deletedhistory' ) ) {
                        if( count($paramArray) >= 1 ) {
                                $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
                                // $paramArray[1] is a CSV of the IDs
                                $Ids = explode( ',', $paramArray[0] );
                                $query = $paramArray[0];
                                // Link to each hidden object ID, $paramArray[1] is the url param
                                $revert = '(' . $this->skin->link(
                                        $revdel,
                                        $this->message['revdel-restore'], 
                                        array(),
                                        array(
                                                'target' => $title->getPrefixedText(),
                                                'type' => 'logging',
                                                'ids' => $query
                                        ),
                                        array( 'known', 'noclasses' )
                                ) . ')';
                        }
                // Self-created users
                } else if( self::typeAction( $row, 'newusers', 'create2' ) ) {
                        if( isset( $paramArray[0] ) ) {
                                $revert = $this->skin->userToolLinks( $paramArray[0], $title->getDBkey(), true );
                        } else {
                                # Fall back to a blue contributions link
                                $revert = $this->skin->userToolLinks( 1, $title->getDBkey() );
                        }
                        $ts = wfTimestamp( TS_UNIX, $row->log_timestamp );
                        if( $ts < '20080129000000' ) {
                                # Suppress $comment from old entries (before 2008-01-29),
                                # not needed and can contain incorrect links
                                $comment = '';
                        }
                // Do nothing. The implementation is handled by the hook modifiying the passed-by-ref parameters.
                } else {
                        wfRunHooks( 'LogLine', array( $row->log_type, $row->log_action, $title, $paramArray,
                                &$comment, &$revert, $row->log_timestamp ) );
                }
                if( $revert != '' ) {
                        $revert = '<span class="mw-logevent-actionlink">' . $revert . '</span>';
                }
                return $revert;
        }

        /**
         * @param $row Row
         * @return string
         */
        private function getShowHideLinks( $row ) {
                global $wgUser;
                if( ( $this->flags & self::NO_ACTION_LINK ) // we don't want to see the links
                        || $row->log_type == 'suppress' ) // no one can hide items from the suppress log
                {
                        return '';
                }
                $del = '';
                // Don't show useless link to people who cannot hide revisions
                if( $wgUser->isAllowed( 'deletedhistory' ) ) {
                        if( $row->log_deleted || $wgUser->isAllowed( 'deleterevision' ) ) {
                                $canHide = $wgUser->isAllowed( 'deleterevision' );
                                // If event was hidden from sysops
                                if( !self::userCan( $row, LogPage::DELETED_RESTRICTED ) ) {
                                        $del = $this->skin->revDeleteLinkDisabled( $canHide );
                                } else {
                                        $target = SpecialPage::getTitleFor( 'Log', $row->log_type );
                                        $query = array(
                                                'target' => $target->getPrefixedDBkey(),
                                                'type'   => 'logging',
                                                'ids'    => $row->log_id,
                                        );
                                        $del = $this->skin->revDeleteLink( $query,
                                                self::isDeleted( $row, LogPage::DELETED_RESTRICTED ), $canHide );
                                }
                        }
                }
                return $del;
        }

        /**
         * @param $row Row
         * @param $type Mixed: string/array
         * @param $action Mixed: string/array
         * @param $right string
         * @return bool
         */
        public static function typeAction( $row, $type, $action, $right='' ) {
                $match = is_array($type) ?
                        in_array( $row->log_type, $type ) : $row->log_type == $type;
                if( $match ) {
                        $match = is_array( $action ) ?
                                in_array( $row->log_action, $action ) : $row->log_action == $action;
                        if( $match && $right ) {
                                global $wgUser;
                                $match = $wgUser->isAllowed( $right );
                        }
                }
                return $match;
        }

        /**
         * Determine if the current user is allowed to view a particular
         * field of this log row, if it's marked as deleted.
         * @param $row Row
         * @param $field Integer
         * @return Boolean
         */
        public static function userCan( $row, $field ) {
                return self::userCanBitfield( $row->log_deleted, $field );
        }
        
        /**
         * Determine if the current user is allowed to view a particular
         * field of this log row, if it's marked as deleted.
         * @param $bitfield Integer (current field)
         * @param $field Integer
         * @return Boolean
         */
        public static function userCanBitfield( $bitfield, $field ) {
                if( $bitfield & $field ) {
                        global $wgUser;
                        $permission = '';
                        if ( $bitfield & LogPage::DELETED_RESTRICTED ) {
                                $permission = 'suppressrevision';
                        } else {
                                $permission = 'deletedhistory';
                        }
                        wfDebug( "Checking for $permission due to $field match on $bitfield\n" );
                        return $wgUser->isAllowed( $permission );
                } else {
                        return true;
                }
        }

        /**
         * @param $row Row
         * @param $field Integer: one of DELETED_* bitfield constants
         * @return Boolean
         */
        public static function isDeleted( $row, $field ) {
                return ( $row->log_deleted & $field ) == $field;
        }

        /**
         * Show log extract. Either with text and a box (set $msgKey) or without (don't set $msgKey)
         * @param $out OutputPage or String-by-reference
         * @param $types String or Array
         * @param $page String The page title to show log entries for
         * @param $user String The user who made the log entries
         * @param $param Associative Array with the following additional options:
         * - lim Integer Limit of items to show, default is 50
         * - conds Array Extra conditions for the query (e.g. "log_action != 'revision'")
         * - showIfEmpty boolean Set to false if you don't want any output in case the loglist is empty
         *   if set to true (default), "No matching items in log" is displayed if loglist is empty
         * - msgKey Array If you want a nice box with a message, set this to the key of the message.
         *   First element is the message key, additional optional elements are parameters for the key
         *   that are processed with wgMsgExt and option 'parse'
         * - offset Set to overwrite offset parameter in $wgRequest
         *   set to '' to unset offset
         * - wrap String Wrap the message in html (usually something like "<div ...>$1</div>").
         * - flags Integer display flags (NO_ACTION_LINK,NO_EXTRA_USER_LINKS)
         * @return Integer Number of total log items (not limited by $lim)
         */
        public static function showLogExtract(
                &$out, $types=array(), $page='', $user='', $param = array()
        ) {
                global $wgUser, $wgOut;
                $defaultParameters = array(
                        'lim' => 25,
                        'conds' => array(),
                        'showIfEmpty' => true,
                        'msgKey' => array(''),
                        'wrap' => "$1",
                        'flags' => 0
                );
                # The + operator appends elements of remaining keys from the right
                # handed array to the left handed, whereas duplicated keys are NOT overwritten.
                $param += $defaultParameters;
                # Convert $param array to individual variables
                $lim = $param['lim'];
                $conds = $param['conds'];
                $showIfEmpty = $param['showIfEmpty'];
                $msgKey = $param['msgKey'];
                $wrap = $param['wrap'];
                $flags = $param['flags'];
                if ( !is_array( $msgKey ) ) {
                        $msgKey = array( $msgKey );
                }
                # Insert list of top 50 (or top $lim) items
                $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut, $flags );
                $pager = new LogPager( $loglist, $types, $user, $page, '', $conds );
                if ( isset( $param['offset'] ) ) { # Tell pager to ignore $wgRequest offset
                        $pager->setOffset( $param['offset'] );
                }
                if( $lim > 0 ) $pager->mLimit = $lim;
                $logBody = $pager->getBody();
                $s = '';
                if( $logBody ) {
                        if ( $msgKey[0] ) {
                                $s = '<div class="mw-warning-with-logexcerpt">';

                                if ( count( $msgKey ) == 1 ) {
                                        $s .= wfMsgExt( $msgKey[0], array( 'parse' ) );
                                } else { // Process additional arguments
                                        $args = $msgKey;
                                        array_shift( $args );
                                        $s .= wfMsgExt( $msgKey[0], array( 'parse' ), $args );
                                }
                        }
                        $s .= $loglist->beginLogEventsList() .
                                 $logBody .
                                 $loglist->endLogEventsList();
                } else {
                        if ( $showIfEmpty )
                                $s = Html::rawElement( 'div', array( 'class' => 'mw-warning-logempty' ),
                                        wfMsgExt( 'logempty', array( 'parseinline' ) ) );
                }
                if( $pager->getNumRows() > $pager->mLimit ) { # Show "Full log" link
                        $urlParam = array();
                        if ( $page != '')
                                $urlParam['page'] = $page;
                        if ( $user != '')
                                $urlParam['user'] = $user;
                        if ( !is_array( $types ) ) # Make it an array, if it isn't
                                $types = array( $types );
                        # If there is exactly one log type, we can link to Special:Log?type=foo
                        if ( count( $types ) == 1 )
                                $urlParam['type'] = $types[0];
                        $s .= $wgUser->getSkin()->link(
                                SpecialPage::getTitleFor( 'Log' ),
                                wfMsgHtml( 'log-fulllog' ),
                                array(),
                                $urlParam
                        );
                }
                if ( $logBody && $msgKey[0] ) {
                        $s .= '</div>';
                }

                if ( $wrap!='' ) { // Wrap message in html
                        $s = str_replace( '$1', $s, $wrap );
                }

                // $out can be either an OutputPage object or a String-by-reference
                if( $out instanceof OutputPage ){
                        $out->addHTML( $s );
                } else {
                        $out = $s;
                }
                return $pager->getNumRows();
        }

        /**
         * SQL clause to skip forbidden log types for this user
         * @param $db Database
         * @param $audience string, public/user
         * @return mixed (string or false)
         */
        public static function getExcludeClause( $db, $audience = 'public' ) {
                global $wgLogRestrictions, $wgUser;
                // Reset the array, clears extra "where" clauses when $par is used
                $hiddenLogs = array();
                // Don't show private logs to unprivileged users
                foreach( $wgLogRestrictions as $logType => $right ) {
                        if( $audience == 'public' || !$wgUser->isAllowed($right) ) {
                                $safeType = $db->strencode( $logType );
                                $hiddenLogs[] = $safeType;
                        }
                }
                if( count($hiddenLogs) == 1 ) {
                        return 'log_type != ' . $db->addQuotes( $hiddenLogs[0] );
                } elseif( $hiddenLogs ) {
                        return 'log_type NOT IN (' . $db->makeList($hiddenLogs) . ')';
                }
                return false;
        }
}

/**
 * @ingroup Pager
 */
class LogPager extends ReverseChronologicalPager {
        private $types = array(), $user = '', $title = '', $pattern = '';
        private $typeCGI = '';
        public $mLogEventsList;

        /**
         * constructor
         * @param $list LogEventsList
         * @param $types String or Array log types to show
         * @param $user String The user who made the log entries
         * @param $title String The page title the log entries are for
         * @param $pattern String Do a prefix search rather than an exact title match
         * @param $conds Array Extra conditions for the query
         * @param $year Integer The year to start from
         * @param $month Integer The month to start from
         */
        public function __construct( $list, $types = array(), $user = '', $title = '', $pattern = '',
                $conds = array(), $year = false, $month = false, $tagFilter = '' ) 
        {
                parent::__construct();
                $this->mConds = $conds;

                $this->mLogEventsList = $list;

                $this->limitType( $types ); // also excludes hidden types
                $this->limitUser( $user );
                $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->user;
                $query['month'] = $this->mMonth;
                $query['year'] = $this->mYear;
                return $query;
        }

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

        /**
         * Set the log reader to return only entries of the given type.
         * Type restrictions enforced here
         * @param $types String or array: Log types ('upload', 'delete', etc);
         *   empty string means no restriction
         */
        private function limitType( $types ) {
                global $wgLogRestrictions, $wgUser;
                // 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...
                foreach ( $types as $type ) {
                        if( isset( $wgLogRestrictions[$type] )
                                && !$wgUser->isAllowed($wgLogRestrictions[$type])
                        ) {
                                $types = array_diff( $types, array( $type ) );
                        }
                }
                $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];
                }
        }

        /**
         * Set the log reader to return only entries by the given user.
         * @param $name String: (In)valid user name
         */
        private function limitUser( $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 {
                        global $wgUser;
                        $this->mConds['log_user'] = $userid;
                        // Paranoia: avoid brute force searches (bug 17342)
                        if( !$wgUser->isAllowed( 'deletedhistory' ) ) {
                                $this->mConds[] = $this->mDb->bitAnd('log_deleted', LogPage::DELETED_USER) . ' = 0';
                        } else if( !$wgUser->isAllowed( 'suppressrevision' ) ) {
                                $this->mConds[] = $this->mDb->bitAnd('log_deleted', LogPage::SUPPRESSED_USER) .
                                        ' != ' . LogPage::SUPPRESSED_USER;
                        }
                        $this->user = $usertitle->getText();
                }
        }

        /**
         * Set the log reader to return only entries affecting the given page.
         * (For the block and rights logs, this is a user page.)
         * @param $page String: Title name as text
         * @param $pattern String
         */
        private function limitTitle( $page, $pattern ) {
                global $wgMiserMode, $wgUser;

                $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'] = $title->getDBkey();
                }
                // Paranoia: avoid brute force searches (bug 17342)
                if( !$wgUser->isAllowed( 'deletedhistory' ) ) {
                        $this->mConds[] = $db->bitAnd('log_deleted', LogPage::DELETED_ACTION) . ' = 0';
                } else if( !$wgUser->isAllowed( 'suppressrevision' ) ) {
                        $this->mConds[] = $db->bitAnd('log_deleted', LogPage::SUPPRESSED_ACTION) .
                                ' != ' . LogPage::SUPPRESSED_ACTION;
                }
        }

        public function getQueryInfo() {
                global $wgOut;
                $tables = array( 'logging', 'user' );
                $this->mConds[] = 'user_id = log_user';
                $index = array();
                $options = array();
                # Add log_search table if there are conditions on it
                if( array_key_exists('ls_field',$this->mConds) ) {
                        $tables[] = 'log_search';
                        $index['log_search'] = 'ls_field_val';
                        $index['logging'] = 'PRIMARY';
                        $options[] = 'DISTINCT';
                # Avoid usage of the wrong index by limiting
                # the choices of available indexes. This mainly
                # avoids site-breaking filesorts.
                } else if( $this->title || $this->pattern || $this->user ) {
                        $index['logging'] = array( 'page_time', 'user_time' );
                        if( count($this->types) == 1 ) {
                                $index['logging'][] = 'log_user_type_time';
                        }
                } else if( count($this->types) == 1 ) {
                        $index['logging'] = 'type_time';
                } else {
                        $index['logging'] = 'times';
                }
                $options['USE INDEX'] = $index;
                # Don't show duplicate rows when using log_search
                $info = array(
                        'tables'     => $tables,
                        'fields'     => array( 'log_type', 'log_action', 'log_user', 'log_namespace',
                                'log_title', 'log_params', 'log_comment', 'log_id', 'log_deleted',
                                'log_timestamp', 'user_name', 'user_editcount' ),
                        'conds'      => $this->mConds,
                        'options'    => $options,
                        'join_conds' => array(
                                'user' => array( 'INNER JOIN', 'user_id=log_user' ),
                                'log_search' => array( 'INNER JOIN', 'ls_log_id=log_id' )
                        )
                );
                # Add ChangeTags filter query
                ChangeTags::modifyDisplayQuery( $info['tables'], $info['fields'], $info['conds'],
                        $info['join_conds'], $info['options'], $this->mTagFilter );
                return $info;
        }

        function getIndexField() {
                return 'log_timestamp';
        }

        public function getStartBody() {
                wfProfileIn( __METHOD__ );
                # Do a link batch query
                if( $this->getNumRows() > 0 ) {
                        $lb = new LinkBatch;
                        while( $row = $this->mResult->fetchObject() ) {
                                $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 ) );
                        }
                        $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 getUser() {
                return $this->user;
        }

        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' );
        }
}

/**
 * @deprecated
 * @ingroup SpecialPage
 */
class LogReader {
        var $pager;
        /**
         * @param $request WebRequest: for internal use use a FauxRequest object to pass arbitrary parameters.
         */
        function __construct( $request ) {
                global $wgUser, $wgOut;
                wfDeprecated(__METHOD__);
                # Get parameters
                $type = $request->getVal( 'type' );
                $user = $request->getText( 'user' );
                $title = $request->getText( 'page' );
                $pattern = $request->getBool( 'pattern' );
                $year = $request->getIntOrNull( 'year' );
                $month = $request->getIntOrNull( 'month' );
                $tagFilter = $request->getVal( 'tagfilter' );
                # Don't let the user get stuck with a certain date
                $skip = $request->getText( 'offset' ) || $request->getText( 'dir' ) == 'prev';
                if( $skip ) {
                        $year = '';
                        $month = '';
                }
                # Use new list class to output results
                $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut, 0 );
                $this->pager = new LogPager( $loglist, $type, $user, $title, $pattern, $year, $month, $tagFilter );
        }

        /**
        * Is there at least one row?
        * @return bool
        */
        public function hasRows() {
                return isset($this->pager) ? ($this->pager->getNumRows() > 0) : false;
        }
}

/**
 * @deprecated
 * @ingroup SpecialPage
 */
class LogViewer {
        const NO_ACTION_LINK = 1;

        /**
         * LogReader object
         */
        var $reader;

        /**
         * @param &$reader LogReader: where to get our data from
         * @param $flags Integer: Bitwise combination of flags:
         *     LogEventsList::NO_ACTION_LINK   Don't show restore/unblock/block links
         */
        function __construct( &$reader, $flags = 0 ) {
                wfDeprecated(__METHOD__);
                $this->reader =& $reader;
                $this->reader->pager->mLogEventsList->flags = $flags;
                # Aliases for shorter code...
                $this->pager =& $this->reader->pager;
                $this->list =& $this->reader->pager->mLogEventsList;
        }

        /**
         * Take over the whole output page in $wgOut with the log display.
         */
        public function show() {
                # Set title and add header
                $this->list->showHeader( $pager->getType() );
                # Show form options
                $this->list->showOptions( $this->pager->getType(), $this->pager->getUser(), $this->pager->getPage(),
                        $this->pager->getPattern(), $this->pager->getYear(), $this->pager->getMonth() );
                # Insert list
                $logBody = $this->pager->getBody();
                if( $logBody ) {
                        $wgOut->addHTML(
                                $this->pager->getNavigationBar() .
                                $this->list->beginLogEventsList() .
                                $logBody .
                                $this->list->endLogEventsList() .
                                $this->pager->getNavigationBar()
                        );
                } else {
                        $wgOut->addWikiMsg( 'logempty' );
                }
        }

        /**
         * Output just the list of entries given by the linked LogReader,
         * with extraneous UI elements. Use for displaying log fragments in
         * another page (eg at Special:Undelete)
         * @param $out OutputPage: where to send output
         */
        public function showList( &$out ) {
                $logBody = $this->pager->getBody();
                if( $logBody ) {
                        $out->addHTML(
                                $this->list->beginLogEventsList() .
                                $logBody .
                                $this->list->endLogEventsList()
                        );
                } else {
                        $out->addWikiMsg( 'logempty' );
                }
        }
}