* added redundand join condition for index usage as per comment on CR r88008

[mediawiki.git] / includes / specials / SpecialContributions.php

<?php
/**
 * Implements Special:Contributions
 *
 * 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
 * @ingroup SpecialPage
 */

/**
 * Special:Contributions, show user contributions in a paged list
 *
 * @ingroup SpecialPage
 */

class SpecialContributions extends SpecialPage {

        protected $opts;

        public function __construct() {
                parent::__construct( 'Contributions' );
        }

        public function execute( $par ) {
                global $wgUser, $wgOut, $wgRequest;

                $this->setHeaders();
                $this->outputHeader();
                $wgOut->addModuleStyles( 'mediawiki.special' );

                $this->opts = array();

                if( $par == 'newbies' ) {
                        $target = 'newbies';
                        $this->opts['contribs'] = 'newbie';
                } elseif( isset( $par ) ) {
                        $target = $par;
                } else {
                        $target = $wgRequest->getVal( 'target' );
                }

                // check for radiobox
                if( $wgRequest->getVal( 'contribs' ) == 'newbie' ) {
                        $target = 'newbies';
                        $this->opts['contribs'] = 'newbie';
                }

                $this->opts['deletedOnly'] = $wgRequest->getBool( 'deletedOnly' );

                if( !strlen( $target ) ) {
                        $wgOut->addHTML( $this->getForm() );
                        return;
                }

                $this->opts['limit'] = $wgRequest->getInt( 'limit', $wgUser->getOption('rclimit') );
                $this->opts['target'] = $target;
                $this->opts['topOnly'] = $wgRequest->getBool( 'topOnly' );

                $nt = Title::makeTitleSafe( NS_USER, $target );
                if( !$nt ) {
                        $wgOut->addHTML( $this->getForm() );
                        return;
                }
                $id = User::idFromName( $nt->getText() );

                if( $target != 'newbies' ) {
                        $target = $nt->getText();
                        $wgOut->setSubtitle( $this->contributionsSub( $nt, $id ) );
                        $wgOut->setHTMLTitle( wfMsg( 'pagetitle', wfMsgExt( 'contributions-title', array( 'parsemag' ),$target ) ) );
                        $user = User::newFromName( $target, false );
                        if ( is_object( $user ) ) {
                                $this->getSkin()->setRelevantUser( $user );
                        }
                } else {
                        $wgOut->setSubtitle( wfMsgHtml( 'sp-contributions-newbies-sub') );
                        $wgOut->setHTMLTitle( wfMsg( 'pagetitle', wfMsg( 'sp-contributions-newbies-title' ) ) );
                }

                if( ( $ns = $wgRequest->getVal( 'namespace', null ) ) !== null && $ns !== '' ) {
                        $this->opts['namespace'] = intval( $ns );
                } else {
                        $this->opts['namespace'] = '';
                }

                $this->opts['tagFilter'] = (string) $wgRequest->getVal( 'tagFilter' );

                // Allows reverts to have the bot flag in recent changes. It is just here to
                // be passed in the form at the top of the page
                if( $wgUser->isAllowed( 'markbotedits' ) && $wgRequest->getBool( 'bot' ) ) {
                        $this->opts['bot'] = '1';
                }

                $skip = $wgRequest->getText( 'offset' ) || $wgRequest->getText( 'dir' ) == 'prev';
                # Offset overrides year/month selection
                if( $skip ) {
                        $this->opts['year'] = '';
                        $this->opts['month'] = '';
                } else {
                        $this->opts['year'] = $wgRequest->getIntOrNull( 'year' );
                        $this->opts['month'] = $wgRequest->getIntOrNull( 'month' );
                }

                $feedType = $wgRequest->getVal( 'feed' );
                if( $feedType ) {
                        // Maintain some level of backwards compatability
                        // If people request feeds using the old parameters, redirect to API
                        $apiParams = array(
                                'action' => 'feedcontributions',
                                'feedformat' => $feedType,
                                'user' => $target,
                        );
                        if ( $this->opts['topOnly'] ) {
                                $apiParams['toponly'] = true;
                        }
                        if ( $this->opts['deletedOnly'] ) {
                                $apiParams['deletedonly'] = true;
                        }
                        if ( $this->opts['tagFilter'] !== '' ) {
                                $apiParams['tagfilter'] = $this->opts['tagFilter'];
                        }
                        if ( $this->opts['namespace'] !== '' ) {
                                $apiParams['namespace'] = $this->opts['namespace'];
                        }
                        if ( $this->opts['year'] !== null ) {
                                $apiParams['year'] = $this->opts['year'];
                        }
                        if ( $this->opts['month'] !== null ) {
                                $apiParams['month'] = $this->opts['month'];
                        }

                        $url = wfScript( 'api' ) . '?' . wfArrayToCGI( $apiParams );

                        $wgOut->redirect( $url, '301' );
                        return;
                }

                // Add RSS/atom links
                $this->addFeedLinks( array( 'action' => 'feedcontributions', 'user' => $target ) );

                if ( wfRunHooks( 'SpecialContributionsBeforeMainOutput', array( $id ) ) ) {

                        $wgOut->addHTML( $this->getForm() );

                        $pager = new ContribsPager( array(
                                'target' => $target,
                                'namespace' => $this->opts['namespace'],
                                'year' => $this->opts['year'],
                                'month' => $this->opts['month'],
                                'deletedOnly' => $this->opts['deletedOnly'],
                                'topOnly' => $this->opts['topOnly'],
                        ) );
                        if( !$pager->getNumRows() ) {
                                $wgOut->addWikiMsg( 'nocontribs', $target );
                        } else {
                                # Show a message about slave lag, if applicable
                                $lag = wfGetLB()->safeGetLag( $pager->getDatabase() );
                                if( $lag > 0 )
                                        $wgOut->showLagWarning( $lag );

                                $wgOut->addHTML(
                                        '<p>' . $pager->getNavigationBar() . '</p>' .
                                        $pager->getBody() .
                                        '<p>' . $pager->getNavigationBar() . '</p>'
                                );
                        }
                        $wgOut->preventClickjacking( $pager->getPreventClickjacking() );

                        # Show the appropriate "footer" message - WHOIS tools, etc.
                        if( $target != 'newbies' ) {
                                $message = 'sp-contributions-footer';
                                if ( IP::isIPAddress( $target ) ) {
                                        $message = 'sp-contributions-footer-anon';
                                } else {
                                        $user = User::newFromName( $target );
                                        if ( !$user || $user->isAnon() ) {
                                                // No message for non-existing users
                                                return;
                                        }
                                }

                                if( !wfMessage( $message, $target )->isDisabled() ) {
                                        $wgOut->wrapWikiMsg(
                                                "<div class='mw-contributions-footer'>\n$1\n</div>",
                                                array( $message, $target ) );
                                }
                        }
                }
        }

        /**
         * Generates the subheading with links
         * @param $nt Title object for the target
         * @param $id Integer: User ID for the target
         * @return String: appropriately-escaped HTML to be output literally
         * @todo FIXME: Almost the same as getSubTitle in SpecialDeletedContributions.php. Could be combined.
         */
        protected function contributionsSub( $nt, $id ) {
                global $wgLang, $wgUser, $wgOut;

                $sk = $this->getSkin();

                if ( $id === null ) {
                        $user = htmlspecialchars( $nt->getText() );
                } else {
                        $user = $sk->link( $nt, htmlspecialchars( $nt->getText() ) );
                }
                $userObj = User::newFromName( $nt->getText(), /* check for username validity not needed */ false );
                $talk = $nt->getTalkPage();
                if( $talk ) {
                        $tools = self::getUserLinks( $nt, $talk, $userObj, $wgUser );
                        $links = $wgLang->pipeList( $tools );

                        // Show a note if the user is blocked and display the last block log entry.
                        if ( $userObj->isBlocked() ) {
                                LogEventsList::showLogExtract(
                                        $wgOut,
                                        'block',
                                        $nt->getPrefixedText(),
                                        '',
                                        array(
                                                'lim' => 1,
                                                'showIfEmpty' => false,
                                                'msgKey' => array(
                                                        $userObj->isAnon() ?
                                                                'sp-contributions-blocked-notice-anon' :
                                                                'sp-contributions-blocked-notice',
                                                        $nt->getText() # Support GENDER in 'sp-contributions-blocked-notice'
                                                ),
                                                'offset' => '' # don't use $wgRequest parameter offset
                                        )
                                );
                        }
                }

                // Old message 'contribsub' had one parameter, but that doesn't work for
                // languages that want to put the "for" bit right after $user but before
                // $links.  If 'contribsub' is around, use it for reverse compatibility,
                // otherwise use 'contribsub2'.
                if( wfEmptyMsg( 'contribsub' ) ) {
                        return wfMsgHtml( 'contribsub2', $user, $links );
                } else {
                        return wfMsgHtml( 'contribsub', "$user ($links)" );
                }
        }

        /**
         * Links to different places.
         * @param $userpage Title: Target user page
         * @param $talkpage Title: Talk page
         * @param $target User: Target user object
         * @param $subject User: The viewing user ($wgUser is still checked in some cases, like userrights page!!)
         */
        public static function getUserLinks( Title $userpage, Title $talkpage, User $target, User $subject ) {

                $sk = $subject->getSkin();
                $id = $target->getId();
                $username = $target->getName();

                $tools[] = $sk->link( $talkpage, wfMsgHtml( 'sp-contributions-talk' ) );

                if( ( $id !== null ) || ( $id === null && IP::isIPAddress( $username ) ) ) {
                        if( $subject->isAllowed( 'block' ) ) { # Block / Change block / Unblock links
                                if ( $target->isBlocked() ) {
                                        $tools[] = $sk->linkKnown( # Change block link
                                                SpecialPage::getTitleFor( 'Block', $username ),
                                                wfMsgHtml( 'change-blocklink' )
                                        );
                                        $tools[] = $sk->linkKnown( # Unblock link
                                                SpecialPage::getTitleFor( 'Unblock', $username ),
                                                wfMsgHtml( 'unblocklink' )
                                        );
                                } else { # User is not blocked
                                        $tools[] = $sk->linkKnown( # Block link
                                                SpecialPage::getTitleFor( 'Block', $username ),
                                                wfMsgHtml( 'blocklink' )
                                        );
                                }
                        }
                        # Block log link
                        $tools[] = $sk->linkKnown(
                                SpecialPage::getTitleFor( 'Log', 'block' ),
                                wfMsgHtml( 'sp-contributions-blocklog' ),
                                array(),
                                array(
                                        'page' => $userpage->getPrefixedText()
                                )
                        );
                }
                # Uploads
                $tools[] = $sk->linkKnown(
                        SpecialPage::getTitleFor( 'Listfiles', $username ),
                        wfMsgHtml( 'sp-contributions-uploads' )
                );

                # Other logs link
                $tools[] = $sk->linkKnown(
                        SpecialPage::getTitleFor( 'Log', $username ),
                        wfMsgHtml( 'sp-contributions-logs' )
                );

                # Add link to deleted user contributions for priviledged users
                if( $subject->isAllowed( 'deletedhistory' ) && !$subject->isBlocked() ) {
                        $tools[] = $sk->linkKnown(
                                SpecialPage::getTitleFor( 'DeletedContributions', $username ),
                                wfMsgHtml( 'sp-contributions-deleted' )
                        );
                }

                # Add a link to change user rights for privileged users
                $userrightsPage = new UserrightsPage();
                if( $id !== null && $userrightsPage->userCanChangeRights( $target ) ) {
                        $tools[] = $sk->linkKnown(
                                SpecialPage::getTitleFor( 'Userrights', $username ),
                                wfMsgHtml( 'sp-contributions-userrights' )
                        );
                }

                wfRunHooks( 'ContributionsToolLinks', array( $id, $userpage, &$tools ) );
                return $tools;
        }

        /**
         * Generates the namespace selector form with hidden attributes.
         * @return String: HTML fragment
         */
        protected function getForm() {
                global $wgScript, $wgMiserMode;

                $this->opts['title'] = $this->getTitle()->getPrefixedText();
                if( !isset( $this->opts['target'] ) ) {
                        $this->opts['target'] = '';
                } else {
                        $this->opts['target'] = str_replace( '_' , ' ' , $this->opts['target'] );
                }

                if( !isset( $this->opts['namespace'] ) ) {
                        $this->opts['namespace'] = '';
                }

                if( !isset( $this->opts['contribs'] ) ) {
                        $this->opts['contribs'] = 'user';
                }

                if( !isset( $this->opts['year'] ) ) {
                        $this->opts['year'] = '';
                }

                if( !isset( $this->opts['month'] ) ) {
                        $this->opts['month'] = '';
                }

                if( $this->opts['contribs'] == 'newbie' ) {
                        $this->opts['target'] = '';
                }

                if( !isset( $this->opts['tagFilter'] ) ) {
                        $this->opts['tagFilter'] = '';
                }

                if( !isset( $this->opts['topOnly'] ) ) {
                        $this->opts['topOnly'] = false;
                }

                $f = Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript, 'class' => 'mw-contributions-form' ) );

                # Add hidden params for tracking except for parameters in $skipParameters
                $skipParameters = array( 'namespace', 'deletedOnly', 'target', 'contribs', 'year', 'month', 'topOnly' );
                foreach ( $this->opts as $name => $value ) {
                        if( in_array( $name, $skipParameters ) ) {
                                continue;
                        }
                        $f .= "\t" . Html::hidden( $name, $value ) . "\n";
                }

                $tagFilter = ChangeTags::buildTagFilterSelector( $this->opts['tagFilter'] );

                $fNS = '';
                if ( !$wgMiserMode ) {
                        $fNS = Html::rawElement( 'span', array( 'style' => 'white-space: nowrap' ),
                                Xml::label( wfMsg( 'namespace' ), 'namespace' ) . ' ' . Xml::namespaceSelector( $this->opts['namespace'], '' )
                        );
                }

                $f .=   Xml::fieldset( wfMsg( 'sp-contributions-search' ) ) .
                        Xml::radioLabel( wfMsgExt( 'sp-contributions-newbies', array( 'parsemag' ) ),
                                'contribs', 'newbie' , 'newbie', $this->opts['contribs'] == 'newbie' ) . '<br />' .
                        Xml::radioLabel( wfMsgExt( 'sp-contributions-username', array( 'parsemag' ) ),
                                'contribs' , 'user', 'user', $this->opts['contribs'] == 'user' ) . ' ' .
                        Html::input( 'target', $this->opts['target'], 'text', array(
                                'size' => '20',
                                'required' => ''
                        ) + ( $this->opts['target'] ? array() : array( 'autofocus' ) ) ) . ' '.
                        $fNS.
                        Xml::checkLabel( wfMsg( 'history-show-deleted' ),
                                'deletedOnly', 'mw-show-deleted-only', $this->opts['deletedOnly'] ) . '<br />' .
                        Xml::tags( 'p', null, Xml::checkLabel( wfMsg( 'sp-contributions-toponly' ),
                                'topOnly', 'mw-show-top-only', $this->opts['topOnly'] ) ) .
                        ( $tagFilter ? Xml::tags( 'p', null, implode( '&#160;', $tagFilter ) ) : '' ) .
                        Html::rawElement( 'p', array( 'style' => 'white-space: nowrap' ),
                                Xml::dateMenu( $this->opts['year'], $this->opts['month'] ) . ' ' .
                                Xml::submitButton( wfMsg( 'sp-contributions-submit' ) )
                        ) . ' ';
                $explain = wfMessage( 'sp-contributions-explain' );
                if ( $explain->exists() ) {
                        $f .= "<p id='mw-sp-contributions-explain'>{$explain}</p>";
                }
                $f .= Xml::closeElement('fieldset' ) .
                        Xml::closeElement( 'form' );
                return $f;
        }
}

/**
 * Pager for Special:Contributions
 * @ingroup SpecialPage Pager
 */
class ContribsPager extends ReverseChronologicalPager {
        public $mDefaultDirection = true;
        var $messages, $target;
        var $namespace = '', $mDb;
        var $preventClickjacking = false;

        function __construct( $options ) {
                parent::__construct();

                $msgs = array( 'uctop', 'diff', 'newarticle', 'rollbacklink', 'diff', 'hist', 'rev-delundel', 'pipe-separator' );

                foreach( $msgs as $msg ) {
                        $this->messages[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
                }

                $this->target = isset( $options['target'] ) ? $options['target'] : '';
                $this->namespace = isset( $options['namespace'] ) ? $options['namespace'] : '';
                $this->tagFilter = isset( $options['tagFilter'] ) ? $options['tagFilter'] : false;

                $this->deletedOnly = !empty( $options['deletedOnly'] );
                $this->topOnly = !empty( $options['topOnly'] );

                $year = isset( $options['year'] ) ? $options['year'] : false;
                $month = isset( $options['month'] ) ? $options['month'] : false;
                $this->getDateCond( $year, $month );

                $this->mDb = wfGetDB( DB_SLAVE, 'contributions' );
        }

        function getDefaultQuery() {
                $query = parent::getDefaultQuery();
                $query['target'] = $this->target;
                return $query;
        }

        function getTitle() {
                return SpecialPage::getTitleFor( 'Contributions' );
        }

        function getQueryInfo() {
                global $wgUser;
                list( $tables, $index, $userCond, $join_cond ) = $this->getUserCond();

                $conds = array_merge( $userCond, $this->getNamespaceCond() );
                // Paranoia: avoid brute force searches (bug 17342)
                if( !$wgUser->isAllowed( 'deletedhistory' ) || $wgUser->isBlocked() ) {
                        $conds[] = $this->mDb->bitAnd('rev_deleted',Revision::DELETED_USER) . ' = 0';
                } elseif( !$wgUser->isAllowed( 'suppressrevision' ) ) {
                        $conds[] = $this->mDb->bitAnd('rev_deleted',Revision::SUPPRESSED_USER) .
                                ' != ' . Revision::SUPPRESSED_USER;
                }
                $join_cond['page'] = array( 'INNER JOIN', 'page_id=rev_page' );

                $queryInfo = array(
                        'tables' => $tables,
                        'fields' => array(
                                'page_namespace', 'page_title', 'page_is_new', 'page_latest', 'page_is_redirect',
                                'page_len','rev_id', 'rev_page', 'rev_text_id', 'rev_timestamp', 'rev_comment',
                                'rev_minor_edit', 'rev_user', 'rev_user_text', 'rev_parent_id', 'rev_deleted',
                                'rc_old_len', 'rc_new_len'
                        ),
                        'conds' => $conds,
                        'options' => array( 'USE INDEX' => array('revision' => $index) ),
                        'join_conds' => $join_cond
                );
                ChangeTags::modifyDisplayQuery(
                        $queryInfo['tables'],
                        $queryInfo['fields'],
                        $queryInfo['conds'],
                        $queryInfo['join_conds'],
                        $queryInfo['options'],
                        $this->tagFilter
                );

                wfRunHooks( 'ContribsPager::getQueryInfo', array( &$this, &$queryInfo ) );
                return $queryInfo;
        }

        function getUserCond() {
                $condition = array();
                $join_conds = array();

                if( $this->target == 'newbies' ) {
                        $tables = array( 'recentchanges', 'user_groups', 'page', 'revision' );
                        $max = $this->mDb->selectField( 'user', 'max(user_id)', false, __METHOD__ );
                        $condition[] = 'rev_user >' . (int)($max - $max / 100);
                        $condition[] = 'ug_group IS NULL';
                        $index = 'user_timestamp';
                        # @todo FIXME: Other groups may have 'bot' rights
                        $join_conds['user_groups'] = array( 'LEFT JOIN', "ug_user = rev_user AND ug_group = 'bot'" );
                        $join_conds['recentchanges'] = array( 'INNER JOIN', "rev_id = rc_this_oldid AND rev_timestamp = rc_timestamp" );
                } else {
                        $tables = array( 'recentchanges', 'page', 'revision' );
                        $condition['rev_user_text'] = $this->target;
                        $join_conds['recentchanges'] = array( 'INNER JOIN', "rev_id = rc_this_oldid AND rev_timestamp = rc_timestamp" );
                        $index = 'usertext_timestamp';
                }
                if( $this->deletedOnly ) {
                        $condition[] = "rev_deleted != '0'";
                }
                if( $this->topOnly ) {
                        $condition[] = "rev_id = page_latest";
                }
                return array( $tables, $index, $condition, $join_conds );
        }

        function getNamespaceCond() {
                global $wgMiserMode;
                if( $this->namespace !== '' && !$wgMiserMode ) {
                        return array( 'page_namespace' => (int)$this->namespace );
                } else {
                        return array();
                }
        }

        function getIndexField() {
                return 'rev_timestamp';
        }

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

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

        /**
         * Generates each row in the contributions list.
         *
         * Contributions which are marked "top" are currently on top of the history.
         * For these contributions, a [rollback] link is shown for users with roll-
         * back privileges. The rollback link restores the most recent version that
         * was not written by the target user.
         *
         * @todo This would probably look a lot nicer in a table.
         */
        function formatRow( $row ) {
                global $wgUser, $wgLang;
                wfProfileIn( __METHOD__ );

                $sk = $this->getSkin();
                $rev = new Revision( $row );
                $classes = array();

                $page = Title::newFromRow( $row );
                $link = $sk->link(
                        $page,
                        htmlspecialchars( $page->getPrefixedText() ),
                        array(),
                        $page->isRedirect() ? array( 'redirect' => 'no' ) : array()
                );
                # Mark current revisions
                $topmarktext = '';
                if( $row->rev_id == $row->page_latest ) {
                        $topmarktext .= '<span class="mw-uctop">' . $this->messages['uctop'] . '</span>';
                        # Add rollback link
                        if( !$row->page_is_new && $page->quickUserCan( 'rollback' )
                                && $page->quickUserCan( 'edit' ) )
                        {
                                $this->preventClickjacking();
                                $topmarktext .= ' '.$sk->generateRollback( $rev );
                        }
                }
                # Is there a visible previous revision?
                if( $rev->userCan( Revision::DELETED_TEXT ) && $rev->getParentId() !== 0 ) {
                        $difftext = $sk->linkKnown(
                                $page,
                                $this->messages['diff'],
                                array(),
                                array(
                                        'diff' => 'prev',
                                        'oldid' => $row->rev_id
                                )
                        );
                } else {
                        $difftext = $this->messages['diff'];
                }
                $histlink = $sk->linkKnown(
                        $page,
                        $this->messages['hist'],
                        array(),
                        array( 'action' => 'history' )
                );

                $comment = $wgLang->getDirMark() . $sk->revComment( $rev, false, true );
                $date = $wgLang->timeanddate( wfTimestamp( TS_MW, $row->rev_timestamp ), true );
                if( $rev->userCan( Revision::DELETED_TEXT ) ) {
                        $d = $sk->linkKnown(
                                $page,
                                htmlspecialchars($date),
                                array(),
                                array( 'oldid' => intval( $row->rev_id ) )
                        );
                } else {
                        $d = htmlspecialchars( $date );
                }
                if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
                        $d = '<span class="history-deleted">' . $d . '</span>';
                }

                if( $this->target == 'newbies' ) {
                        $userlink = ' . . ' . $sk->userLink( $row->rev_user, $row->rev_user_text );
                        $userlink .= ' ' . wfMsg( 'parentheses', $sk->userTalkLink( $row->rev_user, $row->rev_user_text ) ) . ' ';
                } else {
                        $userlink = '';
                }

                if( $rev->getParentId() === 0 ) {
                        $nflag = ChangesList::flag( 'newpage' );
                } else {
                        $nflag = '';
                }

                if( $rev->isMinor() ) {
                        $mflag = ChangesList::flag( 'minor' );
                } else {
                        $mflag = '';
                }

                // Don't show useless link to people who cannot hide revisions
                $canHide = $wgUser->isAllowed( 'deleterevision' );
                if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
                        if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
                                $del = $this->mSkin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
                        } else {
                                $query = array(
                                        'type'   => 'revision',
                                        'target' => $page->getPrefixedDbkey(),
                                        'ids'    => $rev->getId()
                                );
                                $del = $this->mSkin->revDeleteLink( $query,
                                        $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
                        }
                        $del .= ' ';
                } else {
                        $del = '';
                }

                $diffHistLinks = '(' . $difftext . $this->messages['pipe-separator'] . $histlink . ')';

                $diffOut = ' . . ' . $wgLang->getDirMark() .
                        ChangesList::showCharacterDifference( $row->rc_old_len, $row->rc_new_len );

                $ret = "{$del}{$d} {$diffHistLinks} {$nflag}{$mflag} {$link}{$diffOut}{$userlink} {$comment} {$topmarktext}";

                # Denote if username is redacted for this edit
                if( $rev->isDeleted( Revision::DELETED_USER ) ) {
                        $ret .= " <strong>" . wfMsgHtml('rev-deleted-user-contribs') . "</strong>";
                }

                # Tags, if any.
                list($tagSummary, $newClasses) = ChangeTags::formatSummaryRow( $row->ts_tags, 'contributions' );
                $classes = array_merge( $classes, $newClasses );
                $ret .= " $tagSummary";

                // Let extensions add data
                wfRunHooks( 'ContributionsLineEnding', array( &$this, &$ret, $row ) );

                $classes = implode( ' ', $classes );
                $ret = "<li class=\"$classes\">$ret</li>\n";
                wfProfileOut( __METHOD__ );
                return $ret;
        }

        /**
         * Get the Database object in use
         *
         * @return DatabaseBase
         */
        public function getDatabase() {
                return $this->mDb;
        }

        /**
         * Overwrite Pager function and return a helpful comment
         */
        function getSqlComment() {
                if ( $this->namespace || $this->deletedOnly ) {
                        return 'contributions page filtered for namespace or RevisionDeleted edits'; // potentially slow, see CR r58153
                } else {
                        return 'contributions page unfiltered';
                }
        }

        protected function preventClickjacking() {
                $this->preventClickjacking = true;
        }

        public function getPreventClickjacking() {
                return $this->preventClickjacking;
        }
}