SpecialContributions.php

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<?php
class SpecialContributions extends IncludableSpecialPage {
    protected $opts;

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

    public function execute( $par ) {
        $this->setHeaders();
        $this->outputHeader();
        $out = $this->getOutput();
        $out->addModuleStyles( 'mediawiki.special' );

        $this->opts = array();
        $request = $this->getRequest();

        if ( $par !== null ) {
            $target = $par;
        } else {
            $target = $request->getVal( 'target' );
        }

        // check for radiobox
        if ( $request->getVal( 'contribs' ) == 'newbie' ) {
            $target = 'newbies';
            $this->opts['contribs'] = 'newbie';
        } elseif ( $par === 'newbies' ) { // b/c for WMF
            $target = 'newbies';
            $this->opts['contribs'] = 'newbie';
        } else {
            $this->opts['contribs'] = 'user';
        }

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

        if ( !strlen( $target ) ) {
            if ( !$this->including() ) {
                $out->addHTML( $this->getForm() );
            }

            return;
        }

        $user = $this->getUser();

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

        $nt = Title::makeTitleSafe( NS_USER, $target );
        if ( !$nt ) {
            $out->addHTML( $this->getForm() );

            return;
        }
        $userObj = User::newFromName( $nt->getText(), false );
        if ( !$userObj ) {
            $out->addHTML( $this->getForm() );

            return;
        }
        $id = $userObj->getID();

        if ( $this->opts['contribs'] != 'newbie' ) {
            $target = $nt->getText();
            $out->addSubtitle( $this->contributionsSub( $userObj ) );
            $out->setHTMLTitle( $this->msg(
                'pagetitle',
                $this->msg( 'contributions-title', $target )->plain()
            )->inContentLanguage() );
            $this->getSkin()->setRelevantUser( $userObj );
        } else {
            $out->addSubtitle( $this->msg( 'sp-contributions-newbies-sub' ) );
            $out->setHTMLTitle( $this->msg(
                'pagetitle',
                $this->msg( 'sp-contributions-newbies-title' )->plain()
            )->inContentLanguage() );
        }

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

        $this->opts['associated'] = $request->getBool( 'associated' );
        $this->opts['nsInvert'] = (bool)$request->getVal( 'nsInvert' );
        $this->opts['tagfilter'] = (string)$request->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 ( $user->isAllowed( 'markbotedits' ) && $request->getBool( 'bot' ) ) {
            $this->opts['bot'] = '1';
        }

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

        $feedType = $request->getVal( 'feed' );

        $feedParams = array(
            'action' => 'feedcontributions',
            'user' => $target,
        );
        if ( $this->opts['topOnly'] ) {
            $feedParams['toponly'] = true;
        }
        if ( $this->opts['newOnly'] ) {
            $feedParams['newonly'] = true;
        }
        if ( $this->opts['deletedOnly'] ) {
            $feedParams['deletedonly'] = true;
        }
        if ( $this->opts['tagfilter'] !== '' ) {
            $feedParams['tagfilter'] = $this->opts['tagfilter'];
        }
        if ( $this->opts['namespace'] !== '' ) {
            $feedParams['namespace'] = $this->opts['namespace'];
        }
        // Don't use year and month for the feed URL, but pass them on if
        // we redirect to API (if $feedType is specified)
        if ( $feedType && $this->opts['year'] !== null ) {
            $feedParams['year'] = $this->opts['year'];
        }
        if ( $feedType && $this->opts['month'] !== null ) {
            $feedParams['month'] = $this->opts['month'];
        }

        if ( $feedType ) {
            // Maintain some level of backwards compatibility
            // If people request feeds using the old parameters, redirect to API
            $feedParams['feedformat'] = $feedType;
            $url = wfAppendQuery( wfScript( 'api' ), $feedParams );

            $out->redirect( $url, '301' );

            return;
        }

        // Add RSS/atom links
        $this->addFeedLinks( $feedParams );

        if ( wfRunHooks( 'SpecialContributionsBeforeMainOutput', array( $id, $userObj, $this ) ) ) {
            if ( !$this->including() ) {
                $out->addHTML( $this->getForm() );
            }
            $pager = new ContribsPager( $this->getContext(), array(
                'target' => $target,
                'contribs' => $this->opts['contribs'],
                'namespace' => $this->opts['namespace'],
                'tagfilter' => $this->opts['tagfilter'],
                'year' => $this->opts['year'],
                'month' => $this->opts['month'],
                'deletedOnly' => $this->opts['deletedOnly'],
                'topOnly' => $this->opts['topOnly'],
                'newOnly' => $this->opts['newOnly'],
                'nsInvert' => $this->opts['nsInvert'],
                'associated' => $this->opts['associated'],
            ) );

            if ( !$pager->getNumRows() ) {
                $out->addWikiMsg( 'nocontribs', $target );
            } else {
                # Show a message about slave lag, if applicable
                $lag = wfGetLB()->safeGetLag( $pager->getDatabase() );
                if ( $lag > 0 ) {
                    $out->showLagWarning( $lag );
                }

                $output = $pager->getBody();
                if ( !$this->including() ) {
                    $output = '<p>' . $pager->getNavigationBar() . '</p>' .
                        $output .
                        '<p>' . $pager->getNavigationBar() . '</p>';
                }
                $out->addHTML( $output );
            }
            $out->preventClickjacking( $pager->getPreventClickjacking() );

            # Show the appropriate "footer" message - WHOIS tools, etc.
            if ( $this->opts['contribs'] == 'newbie' ) {
                $message = 'sp-contributions-footer-newbies';
            } elseif ( IP::isIPAddress( $target ) ) {
                $message = 'sp-contributions-footer-anon';
            } elseif ( $userObj->isAnon() ) {
                // No message for non-existing users
                $message = '';
            } else {
                $message = 'sp-contributions-footer';
            }

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

    protected function contributionsSub( $userObj ) {
        if ( $userObj->isAnon() ) {
            // Show a warning message that the user being searched for doesn't exists
            if ( !User::isIP( $userObj->getName() ) ) {
                $this->getOutput()->wrapWikiMsg(
                    "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
                    array(
                        'contributions-userdoesnotexist',
                        wfEscapeWikiText( $userObj->getName() ),
                    )
                );
                if ( !$this->including() ) {
                    $this->getOutput()->setStatusCode( 404 );
                }
            }
            $user = htmlspecialchars( $userObj->getName() );
        } else {
            $user = Linker::link( $userObj->getUserPage(), htmlspecialchars( $userObj->getName() ) );
        }
        $nt = $userObj->getUserPage();
        $talk = $userObj->getTalkPage();
        $links = '';
        if ( $talk ) {
            $tools = $this->getUserLinks( $nt, $talk, $userObj );
            $links = $this->getLanguage()->pipeList( $tools );

            // Show a note if the user is blocked and display the last block log entry.
            // Do not expose the autoblocks, since that may lead to a leak of accounts' IPs,
            // and also this will display a totally irrelevant log entry as a current block.
            if ( !$this->including() ) {
                $block = Block::newFromTarget( $userObj, $userObj );
                if ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
                    if ( $block->getType() == Block::TYPE_RANGE ) {
                        $nt = MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget();
                    }

                    $out = $this->getOutput(); // showLogExtract() wants first parameter by reference
                    LogEventsList::showLogExtract(
                        $out,
                        'block',
                        $nt,
                        '',
                        array(
                            'lim' => 1,
                            'showIfEmpty' => false,
                            'msgKey' => array(
                                $userObj->isAnon() ?
                                    'sp-contributions-blocked-notice-anon' :
                                    'sp-contributions-blocked-notice',
                                $userObj->getName() # Support GENDER in 'sp-contributions-blocked-notice'
                            ),
                            'offset' => '' # don't use WebRequest parameter offset
                        )
                    );
                }
            }
        }

        return $this->msg( 'contribsub2' )->rawParams( $user, $links )->params( $userObj->getName() );
    }

    public function getUserLinks( Title $userpage, Title $talkpage, User $target ) {

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

        $tools[] = Linker::link( $talkpage, $this->msg( 'sp-contributions-talk' )->escaped() );

        if ( ( $id !== null ) || ( $id === null && IP::isIPAddress( $username ) ) ) {
            if ( $this->getUser()->isAllowed( 'block' ) ) { # Block / Change block / Unblock links
                if ( $target->isBlocked() && $target->getBlock()->getType() != Block::TYPE_AUTO ) {
                    $tools[] = Linker::linkKnown( # Change block link
                        SpecialPage::getTitleFor( 'Block', $username ),
                        $this->msg( 'change-blocklink' )->escaped()
                    );
                    $tools[] = Linker::linkKnown( # Unblock link
                        SpecialPage::getTitleFor( 'Unblock', $username ),
                        $this->msg( 'unblocklink' )->escaped()
                    );
                } else { # User is not blocked
                    $tools[] = Linker::linkKnown( # Block link
                        SpecialPage::getTitleFor( 'Block', $username ),
                        $this->msg( 'blocklink' )->escaped()
                    );
                }
            }

            # Block log link
            $tools[] = Linker::linkKnown(
                SpecialPage::getTitleFor( 'Log', 'block' ),
                $this->msg( 'sp-contributions-blocklog' )->escaped(),
                array(),
                array( 'page' => $userpage->getPrefixedText() )
            );

            # Suppression log link (bug 59120)
            if ( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
                $tools[] = Linker::linkKnown(
                    SpecialPage::getTitleFor( 'Log', 'suppress' ),
                    $this->msg( 'sp-contributions-suppresslog' )->escaped(),
                    array(),
                    array( 'offender' => $username )
                );
            }
        }
        # Uploads
        $tools[] = Linker::linkKnown(
            SpecialPage::getTitleFor( 'Listfiles', $username ),
            $this->msg( 'sp-contributions-uploads' )->escaped()
        );

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

        # Add link to deleted user contributions for priviledged users
        if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
            $tools[] = Linker::linkKnown(
                SpecialPage::getTitleFor( 'DeletedContributions', $username ),
                $this->msg( 'sp-contributions-deleted' )->escaped()
            );
        }

        # Add a link to change user rights for privileged users
        $userrightsPage = new UserrightsPage();
        $userrightsPage->setContext( $this->getContext() );
        if ( $userrightsPage->userCanChangeRights( $target ) ) {
            $tools[] = Linker::linkKnown(
                SpecialPage::getTitleFor( 'Userrights', $username ),
                $this->msg( 'sp-contributions-userrights' )->escaped()
            );
        }

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

        return $tools;
    }

    protected function getForm() {
        $this->opts['title'] = $this->getPageTitle()->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['nsInvert'] ) ) {
            $this->opts['nsInvert'] = '';
        }

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

        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;
        }

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

        $form = Html::openElement(
            'form',
            array(
                'method' => 'get',
                'action' => wfScript(),
                'class' => 'mw-contributions-form'
            )
        );

        # Add hidden params for tracking except for parameters in $skipParameters
        $skipParameters = array(
            'namespace',
            'nsInvert',
            'deletedOnly',
            'target',
            'contribs',
            'year',
            'month',
            'topOnly',
            'newOnly',
            'associated'
        );

        foreach ( $this->opts as $name => $value ) {
            if ( in_array( $name, $skipParameters ) ) {
                continue;
            }
            $form .= "\t" . Html::hidden( $name, $value ) . "\n";
        }

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

        if ( $tagFilter ) {
            $filterSelection = Html::rawElement(
                'td',
                array( 'class' => 'mw-label' ),
                array_shift( $tagFilter )
            );
            $filterSelection .= Html::rawElement(
                'td',
                array( 'class' => 'mw-input' ),
                implode( '&#160', $tagFilter )
            );
        } else {
            $filterSelection = Html::rawElement( 'td', array( 'colspan' => 2 ), '' );
        }

        $labelNewbies = Xml::radioLabel(
            $this->msg( 'sp-contributions-newbies' )->text(),
            'contribs',
            'newbie',
            'newbie',
            $this->opts['contribs'] == 'newbie',
            array( 'class' => 'mw-input' )
        );
        $labelUsername = Xml::radioLabel(
            $this->msg( 'sp-contributions-username' )->text(),
            'contribs',
            'user',
            'user',
            $this->opts['contribs'] == 'user',
            array( 'class' => 'mw-input' )
        );
        $input = Html::input(
            'target',
            $this->opts['target'],
            'text',
            array( 'size' => '40', 'required' => '', 'class' => 'mw-input' ) +
                ( $this->opts['target'] ? array() : array( 'autofocus' )
                )
        );
        $targetSelection = Html::rawElement(
            'td',
            array( 'colspan' => 2 ),
            $labelNewbies . '<br />' . $labelUsername . ' ' . $input . ' '
        );

        $namespaceSelection = Xml::tags(
            'td',
            array( 'class' => 'mw-label' ),
            Xml::label(
                $this->msg( 'namespace' )->text(),
                'namespace',
                ''
            )
        );
        $namespaceSelection .= Html::rawElement(
            'td',
            null,
            Html::namespaceSelector(
                array( 'selected' => $this->opts['namespace'], 'all' => '' ),
                array(
                    'name' => 'namespace',
                    'id' => 'namespace',
                    'class' => 'namespaceselector',
                )
            ) . '&#160;' .
                Html::rawElement(
                    'span',
                    array( 'style' => 'white-space: nowrap' ),
                    Xml::checkLabel(
                        $this->msg( 'invert' )->text(),
                        'nsInvert',
                        'nsInvert',
                        $this->opts['nsInvert'],
                        array(
                            'title' => $this->msg( 'tooltip-invert' )->text(),
                            'class' => 'mw-input'
                        )
                    ) . '&#160;'
                ) .
                Html::rawElement( 'span', array( 'style' => 'white-space: nowrap' ),
                    Xml::checkLabel(
                        $this->msg( 'namespace_association' )->text(),
                        'associated',
                        'associated',
                        $this->opts['associated'],
                        array(
                            'title' => $this->msg( 'tooltip-namespace_association' )->text(),
                            'class' => 'mw-input'
                        )
                    ) . '&#160;'
                )
        );

        if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
            $deletedOnlyCheck = Html::rawElement(
                'span',
                array( 'style' => 'white-space: nowrap' ),
                Xml::checkLabel(
                    $this->msg( 'history-show-deleted' )->text(),
                    'deletedOnly',
                    'mw-show-deleted-only',
                    $this->opts['deletedOnly'],
                    array( 'class' => 'mw-input' )
                )
            );
        } else {
            $deletedOnlyCheck = '';
        }

        $checkLabelTopOnly = Html::rawElement(
            'span',
            array( 'style' => 'white-space: nowrap' ),
            Xml::checkLabel(
                $this->msg( 'sp-contributions-toponly' )->text(),
                'topOnly',
                'mw-show-top-only',
                $this->opts['topOnly'],
                array( 'class' => 'mw-input' )
            )
        );
        $checkLabelNewOnly = Html::rawElement(
            'span',
            array( 'style' => 'white-space: nowrap' ),
            Xml::checkLabel(
                $this->msg( 'sp-contributions-newonly' )->text(),
                'newOnly',
                'mw-show-new-only',
                $this->opts['newOnly'],
                array( 'class' => 'mw-input' )
            )
        );
        $extraOptions = Html::rawElement(
            'td',
            array( 'colspan' => 2 ),
            $deletedOnlyCheck . $checkLabelTopOnly . $checkLabelNewOnly
        );

        $dateSelectionAndSubmit = Xml::tags( 'td', array( 'colspan' => 2 ),
            Xml::dateMenu(
                $this->opts['year'] === '' ? MWTimestamp::getInstance()->format( 'Y' ) : $this->opts['year'],
                $this->opts['month']
            ) . ' ' .
                Xml::submitButton(
                    $this->msg( 'sp-contributions-submit' )->text(),
                    array( 'class' => 'mw-submit' )
                )
        );

        $form .= Xml::fieldset( $this->msg( 'sp-contributions-search' )->text() );
        $form .= Html::rawElement( 'table', array( 'class' => 'mw-contributions-table' ), "\n" .
            Html::rawElement( 'tr', array(), $targetSelection ) . "\n" .
            Html::rawElement( 'tr', array(), $namespaceSelection ) . "\n" .
            Html::rawElement( 'tr', array(), $filterSelection ) . "\n" .
            Html::rawElement( 'tr', array(), $extraOptions ) . "\n" .
            Html::rawElement( 'tr', array(), $dateSelectionAndSubmit ) . "\n"
        );

        $explain = $this->msg( 'sp-contributions-explain' );
        if ( !$explain->isBlank() ) {
            $form .= "<p id='mw-sp-contributions-explain'>{$explain->parse()}</p>";
        }

        $form .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' );

        return $form;
    }

    protected function getGroupName() {
        return 'users';
    }
}

class ContribsPager extends ReverseChronologicalPager {
    public $mDefaultDirection = IndexPager::DIR_DESCENDING;
    public $messages;
    public $target;
    public $namespace = '';
    public $mDb;
    public $preventClickjacking = false;

    public $mDbSecondary;

    protected $mParentLens;

    function __construct( IContextSource $context, array $options ) {
        parent::__construct( $context );

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

        foreach ( $msgs as $msg ) {
            $this->messages[$msg] = $this->msg( $msg )->escaped();
        }

        $this->target = isset( $options['target'] ) ? $options['target'] : '';
        $this->contribs = isset( $options['contribs'] ) ? $options['contribs'] : 'users';
        $this->namespace = isset( $options['namespace'] ) ? $options['namespace'] : '';
        $this->tagFilter = isset( $options['tagfilter'] ) ? $options['tagfilter'] : false;
        $this->nsInvert = isset( $options['nsInvert'] ) ? $options['nsInvert'] : false;
        $this->associated = isset( $options['associated'] ) ? $options['associated'] : false;

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

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

        // Most of this code will use the 'contributions' group DB, which can map to slaves
        // with extra user based indexes or partioning by user. The additional metadata
        // queries should use a regular slave since the lookup pattern is not all by user.
        $this->mDbSecondary = wfGetDB( DB_SLAVE ); // any random slave
        $this->mDb = wfGetDB( DB_SLAVE, 'contributions' );
    }

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

        return $query;
    }

    function reallyDoQuery( $offset, $limit, $descending ) {
        list( $tables, $fields, $conds, $fname, $options, $join_conds ) = $this->buildQueryInfo(
            $offset,
            $limit,
            $descending
        );
        $pager = $this;

        /*
         * This hook will allow extensions to add in additional queries, so they can get their data
         * in My Contributions as well. Extensions should append their results to the $data array.
         *
         * Extension queries have to implement the navbar requirement as well. They should
         * - have a column aliased as $pager->getIndexField()
         * - have LIMIT set
         * - have a WHERE-clause that compares the $pager->getIndexField()-equivalent column to the offset
         * - have the ORDER BY specified based upon the details provided by the navbar
         *
         * See includes/Pager.php buildQueryInfo() method on how to build LIMIT, WHERE & ORDER BY
         *
         * &$data: an array of results of all contribs queries
         * $pager: the ContribsPager object hooked into
         * $offset: see phpdoc above
         * $limit: see phpdoc above
         * $descending: see phpdoc above
         */
        $data = array( $this->mDb->select(
            $tables, $fields, $conds, $fname, $options, $join_conds
        ) );
        wfRunHooks(
            'ContribsPager::reallyDoQuery',
            array( &$data, $pager, $offset, $limit, $descending )
        );

        $result = array();

        // loop all results and collect them in an array
        foreach ( $data as $query ) {
            foreach ( $query as $i => $row ) {
                // use index column as key, allowing us to easily sort in PHP
                $result[$row->{$this->getIndexField()} . "-$i"] = $row;
            }
        }

        // sort results
        if ( $descending ) {
            ksort( $result );
        } else {
            krsort( $result );
        }

        // enforce limit
        $result = array_slice( $result, 0, $limit );

        // get rid of array keys
        $result = array_values( $result );

        return new FakeResultWrapper( $result );
    }

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

        $user = $this->getUser();
        $conds = array_merge( $userCond, $this->getNamespaceCond() );

        // Paranoia: avoid brute force searches (bug 17342)
        if ( !$user->isAllowed( 'deletedhistory' ) ) {
            $conds[] = $this->mDb->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0';
        } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
            $conds[] = $this->mDb->bitAnd( 'rev_deleted', Revision::SUPPRESSED_USER ) .
                ' != ' . Revision::SUPPRESSED_USER;
        }

        # Don't include orphaned revisions
        $join_cond['page'] = Revision::pageJoinCond();
        # Get the current user name for accounts
        $join_cond['user'] = Revision::userJoinCond();

        $options = array();
        if ( $index ) {
            $options['USE INDEX'] = array( 'revision' => $index );
        }

        $queryInfo = array(
            'tables' => $tables,
            'fields' => array_merge(
                Revision::selectFields(),
                Revision::selectUserFields(),
                array( 'page_namespace', 'page_title', 'page_is_new',
                    'page_latest', 'page_is_redirect', 'page_len' )
            ),
            'conds' => $conds,
            'options' => $options,
            '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();
        $tables = array( 'revision', 'page', 'user' );
        $index = false;
        if ( $this->contribs == 'newbie' ) {
            $max = $this->mDb->selectField( 'user', 'max(user_id)', false, __METHOD__ );
            $condition[] = 'rev_user >' . (int)( $max - $max / 100 );
            # ignore local groups with the bot right
            # @todo FIXME: Global groups may have 'bot' rights
            $groupsWithBotPermission = User::getGroupsWithPermission( 'bot' );
            if ( count( $groupsWithBotPermission ) ) {
                $tables[] = 'user_groups';
                $condition[] = 'ug_group IS NULL';
                $join_conds['user_groups'] = array(
                    'LEFT JOIN', array(
                        'ug_user = rev_user',
                        'ug_group' => $groupsWithBotPermission
                    )
                );
            }
        } else {
            $uid = User::idFromName( $this->target );
            if ( $uid ) {
                $condition['rev_user'] = $uid;
                $index = 'user_timestamp';
            } else {
                $condition['rev_user_text'] = $this->target;
                $index = 'usertext_timestamp';
            }
        }

        if ( $this->deletedOnly ) {
            $condition[] = 'rev_deleted != 0';
        }

        if ( $this->topOnly ) {
            $condition[] = 'rev_id = page_latest';
        }

        if ( $this->newOnly ) {
            $condition[] = 'rev_parent_id = 0';
        }

        return array( $tables, $index, $condition, $join_conds );
    }

    function getNamespaceCond() {
        if ( $this->namespace !== '' ) {
            $selectedNS = $this->mDb->addQuotes( $this->namespace );
            $eq_op = $this->nsInvert ? '!=' : '=';
            $bool_op = $this->nsInvert ? 'AND' : 'OR';

            if ( !$this->associated ) {
                return array( "page_namespace $eq_op $selectedNS" );
            }

            $associatedNS = $this->mDb->addQuotes(
                MWNamespace::getAssociated( $this->namespace )
            );

            return array(
                "page_namespace $eq_op $selectedNS " .
                    $bool_op .
                    " page_namespace $eq_op $associatedNS"
            );
        }

        return array();
    }

    function getIndexField() {
        return 'rev_timestamp';
    }

    function doBatchLookups() {
        # Do a link batch query
        $this->mResult->seek( 0 );
        $revIds = array();
        $batch = new LinkBatch();
        # Give some pointers to make (last) links
        foreach ( $this->mResult as $row ) {
            if ( isset( $row->rev_parent_id ) && $row->rev_parent_id ) {
                $revIds[] = $row->rev_parent_id;
            }
            if ( isset( $row->rev_id ) ) {
                if ( $this->contribs === 'newbie' ) { // multiple users
                    $batch->add( NS_USER, $row->user_name );
                    $batch->add( NS_USER_TALK, $row->user_name );
                }
                $batch->add( $row->page_namespace, $row->page_title );
            }
        }
        $this->mParentLens = Revision::getParentLengths( $this->mDbSecondary, $revIds );
        $batch->execute();
        $this->mResult->seek( 0 );
    }

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

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

    function formatRow( $row ) {
        wfProfileIn( __METHOD__ );

        $ret = '';
        $classes = array();

        /*
         * There may be more than just revision rows. To make sure that we'll only be processing
         * revisions here, let's _try_ to build a revision out of our row (without displaying
         * notices though) and then trying to grab data from the built object. If we succeed,
         * we're definitely dealing with revision data and we may proceed, if not, we'll leave it
         * to extensions to subscribe to the hook to parse the row.
         */
        wfSuppressWarnings();
        try {
            $rev = new Revision( $row );
            $validRevision = (bool)$rev->getId();
        } catch ( MWException $e ) {
            $validRevision = false;
        }
        wfRestoreWarnings();

        if ( $validRevision ) {
            $classes = array();

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

            if ( $row->rev_parent_id === null ) {
                // For some reason rev_parent_id isn't populated for this row.
                // Its rumoured this is true on wikipedia for some revisions (bug 34922).
                // Next best thing is to have the total number of bytes.
                $chardiff = ' <span class="mw-changeslist-separator">. .</span> ';
                $chardiff .= Linker::formatRevisionSize( $row->rev_len );
                $chardiff .= ' <span class="mw-changeslist-separator">. .</span> ';
            } else {
                $parentLen = 0;
                if ( isset( $this->mParentLens[$row->rev_parent_id] ) ) {
                    $parentLen = $this->mParentLens[$row->rev_parent_id];
                }

                $chardiff = ' <span class="mw-changeslist-separator">. .</span> ';
                $chardiff .= ChangesList::showCharacterDifference(
                    $parentLen,
                    $row->rev_len,
                    $this->getContext()
                );
                $chardiff .= ' <span class="mw-changeslist-separator">. .</span> ';
            }

            $lang = $this->getLanguage();
            $comment = $lang->getDirMark() . Linker::revComment( $rev, false, true );
            $date = $lang->userTimeAndDate( $row->rev_timestamp, $user );
            if ( $rev->userCan( Revision::DELETED_TEXT, $user ) ) {
                $d = Linker::linkKnown(
                    $page,
                    htmlspecialchars( $date ),
                    array( 'class' => 'mw-changeslist-date' ),
                    array( 'oldid' => intval( $row->rev_id ) )
                );
            } else {
                $d = htmlspecialchars( $date );
            }
            if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
                $d = '<span class="history-deleted">' . $d . '</span>';
            }

            # Show user names for /newbies as there may be different users.
            # Note that we already excluded rows with hidden user names.
            if ( $this->contribs == 'newbie' ) {
                $userlink = ' . . ' . $lang->getDirMark()
                    . Linker::userLink( $rev->getUser(), $rev->getUserText() );
                $userlink .= ' ' . $this->msg( 'parentheses' )->rawParams(
                    Linker::userTalkLink( $rev->getUser(), $rev->getUserText() ) )->escaped() . ' ';
            } else {
                $userlink = '';
            }

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

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

            $del = Linker::getRevDeleteLink( $user, $rev, $page );
            if ( $del !== '' ) {
                $del .= ' ';
            }

            $diffHistLinks = $this->msg( 'parentheses' )
                ->rawParams( $difftext . $this->messages['pipe-separator'] . $histlink )
                ->escaped();
            $ret = "{$del}{$d} {$diffHistLinks}{$chardiff}{$nflag}{$mflag} ";
            $ret .= "{$link}{$userlink} {$comment} {$topmarktext}";

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

        if ( $classes === array() && $ret === '' ) {
            wfDebug( "Dropping Special:Contribution row that could not be formatted\n" );
            $ret = "<!-- Could not format Special:Contribution row. -->\n";
        } else {
            $ret = Html::rawElement( 'li', array( 'class' => $classes ), $ret ) . "\n";
        }

        wfProfileOut( __METHOD__ );

        return $ret;
    }

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

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

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