HistoryAction.php

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<?php
use MediaWiki\MediaWikiServices;
use Wikimedia\Rdbms\IResultWrapper;
use Wikimedia\Rdbms\FakeResultWrapper;

class HistoryAction extends FormlessAction {
    const DIR_PREV = 0;
    const DIR_NEXT = 1;

    public $message;

    public function getName() {
        return 'history';
    }

    public function requiresWrite() {
        return false;
    }

    public function requiresUnblock() {
        return false;
    }

    protected function getPageTitle() {
        return $this->msg( 'history-title', $this->getTitle()->getPrefixedText() )->text();
    }

    protected function getDescription() {
        // Creation of a subtitle link pointing to [[Special:Log]]
        $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
        $subtitle = $linkRenderer->makeKnownLink(
            SpecialPage::getTitleFor( 'Log' ),
            $this->msg( 'viewpagelogs' )->text(),
            [],
            [ 'page' => $this->getTitle()->getPrefixedText() ]
        );

        $links = [];
        // Allow extensions to add more links
        Hooks::run( 'HistoryPageToolLinks', [ $this->getContext(), $linkRenderer, &$links ] );
        if ( $links ) {
            $subtitle .= ''
                . $this->msg( 'word-separator' )->escaped()
                . $this->msg( 'parentheses' )
                    ->rawParams( $this->getLanguage()->pipeList( $links ) )
                    ->escaped();
        }
        return Html::rawElement( 'div', [ 'class' => 'mw-history-subtitle' ], $subtitle );
    }

    public function getArticle() {
        return $this->page;
    }

    private function preCacheMessages() {
        // Precache various messages
        if ( !isset( $this->message ) ) {
            $this->message = [];
            $msgs = [ 'cur', 'last', 'pipe-separator' ];
            foreach ( $msgs as $msg ) {
                $this->message[$msg] = $this->msg( $msg )->escaped();
            }
        }
    }

    private function getTimestampFromRequest( WebRequest $request ) {
        // Backwards compatibility checks for URIs with only year and/or month.
        $year = $request->getInt( 'year' );
        $month = $request->getInt( 'month' );
        $day = null;
        if ( $year !== 0 || $month !== 0 ) {
            if ( $year === 0 ) {
                $year = MWTimestamp::getLocalInstance()->format( 'Y' );
            }
            if ( $month < 1 || $month > 12 ) {
                // month is invalid so treat as December (all months)
                $month = 12;
            }
            // month is valid so check day
            $day = cal_days_in_month( CAL_GREGORIAN, $month, $year );

            // Left pad the months and days
            $month = str_pad( $month, 2, "0", STR_PAD_LEFT );
            $day = str_pad( $day, 2, "0", STR_PAD_LEFT );
        }

        $before = $request->getVal( 'date-range-to' );
        if ( $before ) {
            $parts = explode( '-', $before );
            $year = $parts[0];
            // check date input is valid
            if ( count( $parts ) === 3 ) {
                $month = $parts[1];
                $day = $parts[2];
            }
        }
        return $year && $month && $day ? $year . '-' . $month . '-' . $day : '';
    }

    function onView() {
        $out = $this->getOutput();
        $request = $this->getRequest();

        // Allow client-side HTTP caching of the history page.
        // But, always ignore this cache if the (logged-in) user has this page on their watchlist
        // and has one or more unseen revisions. Otherwise, we might be showing stale update markers.
        // The Last-Modified for the history page does not change when user's markers are cleared,
        // so going from "some unseen" to "all seen" would not clear the cache.
        // But, when all of the revisions are marked as seen, then only way for new unseen revision
        // markers to appear, is for the page to be edited, which updates page_touched/Last-Modified.
        if (
            !$this->hasUnseenRevisionMarkers() &&
            $out->checkLastModified( $this->page->getTouched() )
        ) {
            return null; // Client cache fresh and headers sent, nothing more to do.
        }

        $this->preCacheMessages();
        $config = $this->context->getConfig();

        # Fill in the file cache if not set already
        if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
            $cache = new HTMLFileCache( $this->getTitle(), 'history' );
            if ( !$cache->isCacheGood( /* Assume up to date */ ) ) {
                ob_start( [ &$cache, 'saveToFileCache' ] );
            }
        }

        // Setup page variables.
        $out->setFeedAppendQuery( 'action=history' );
        $out->addModules( 'mediawiki.action.history' );
        $out->addModuleStyles( [
            'mediawiki.interface.helpers.styles',
            'mediawiki.action.history.styles',
            'mediawiki.special.changeslist',
        ] );
        if ( $config->get( 'UseMediaWikiUIEverywhere' ) ) {
            $out = $this->getOutput();
            $out->addModuleStyles( [
                'mediawiki.ui.input',
                'mediawiki.ui.checkbox',
            ] );
        }

        // Handle atom/RSS feeds.
        $feedType = $request->getRawVal( 'feed' );
        if ( $feedType !== null ) {
            $this->feed( $feedType );
            return null;
        }

        $this->addHelpLink(
            'https://meta.wikimedia.org/wiki/Special:MyLanguage/Help:Page_history',
            true
        );

        // Fail nicely if article doesn't exist.
        if ( !$this->page->exists() ) {
            global $wgSend404Code;
            if ( $wgSend404Code ) {
                $out->setStatusCode( 404 );
            }
            $out->addWikiMsg( 'nohistory' );

            $dbr = wfGetDB( DB_REPLICA );

            # show deletion/move log if there is an entry
            LogEventsList::showLogExtract(
                $out,
                [ 'delete', 'move', 'protect' ],
                $this->getTitle(),
                '',
                [ 'lim' => 10,
                    'conds' => [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ],
                    'showIfEmpty' => false,
                    'msgKey' => [ 'moveddeleted-notice' ]
                ]
            );

            return null;
        }

        $ts = $this->getTimestampFromRequest( $request );
        $tagFilter = $request->getVal( 'tagfilter' );

        if ( $request->getBool( 'deleted' ) ) {
            $conds = [ 'rev_deleted != 0' ];
        } else {
            $conds = [];
        }

        // Add the general form.
        $fields = [
            [
                'name' => 'title',
                'type' => 'hidden',
                'default' => $this->getTitle()->getPrefixedDBkey(),
            ],
            [
                'name' => 'action',
                'type' => 'hidden',
                'default' => 'history',
            ],
            [
                'type' => 'date',
                'default' => $ts,
                'label' => $this->msg( 'date-range-to' )->text(),
                'name' => 'date-range-to',
            ],
            [
                'label-raw' => $this->msg( 'tag-filter' )->parse(),
                'type' => 'tagfilter',
                'id' => 'tagfilter',
                'name' => 'tagfilter',
                'value' => $tagFilter,
            ]
        ];
        $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
        if ( $permissionManager->userHasRight( $this->getUser(), 'deletedhistory' ) ) {
            $fields[] = [
                'type' => 'check',
                'label' => $this->msg( 'history-show-deleted' )->text(),
                'default' => $request->getBool( 'deleted' ),
                'name' => 'deleted',
            ];
        }

        $out->enableOOUI();
        $htmlForm = HTMLForm::factory( 'ooui', $fields, $this->getContext() );
        $htmlForm
            ->setMethod( 'get' )
            ->setAction( wfScript() )
            ->setCollapsibleOptions( true )
            ->setId( 'mw-history-searchform' )
            ->setSubmitText( $this->msg( 'historyaction-submit' )->text() )
            ->setWrapperAttributes( [ 'id' => 'mw-history-search' ] )
            ->setWrapperLegend( $this->msg( 'history-fieldset-title' )->text() );
        $htmlForm->loadData();

        $out->addHTML( $htmlForm->getHTML( false ) );

        Hooks::run( 'PageHistoryBeforeList', [ &$this->page, $this->getContext() ] );

        // Create and output the list.
        $dateComponents = explode( '-', $ts );
        if ( count( $dateComponents ) > 1 ) {
            $y = $dateComponents[0];
            $m = $dateComponents[1];
            $d = $dateComponents[2];
        } else {
            $y = '';
            $m = '';
            $d = '';
        }
        $pager = new HistoryPager( $this, $y, $m, $tagFilter, $conds, $d );
        $out->addHTML(
            $pager->getNavigationBar() .
            $pager->getBody() .
            $pager->getNavigationBar()
        );
        $out->preventClickjacking( $pager->getPreventClickjacking() );

        return null;
    }

    private function hasUnseenRevisionMarkers() {
        return (
            $this->getContext()->getConfig()->get( 'ShowUpdatedMarker' ) &&
            $this->getTitle()->getNotificationTimestamp( $this->getUser() )
        );
    }

    function fetchRevisions( $limit, $offset, $direction ) {
        // Fail if article doesn't exist.
        if ( !$this->getTitle()->exists() ) {
            return new FakeResultWrapper( [] );
        }

        $dbr = wfGetDB( DB_REPLICA );

        if ( $direction === self::DIR_PREV ) {
            list( $dirs, $oper ) = [ "ASC", ">=" ];
        } else { /* $direction === self::DIR_NEXT */
            list( $dirs, $oper ) = [ "DESC", "<=" ];
        }

        if ( $offset ) {
            $offsets = [ "rev_timestamp $oper " . $dbr->addQuotes( $dbr->timestamp( $offset ) ) ];
        } else {
            $offsets = [];
        }

        $page_id = $this->page->getId();

        $revQuery = Revision::getQueryInfo();
        return $dbr->select(
            $revQuery['tables'],
            $revQuery['fields'],
            array_merge( [ 'rev_page' => $page_id ], $offsets ),
            __METHOD__,
            [
                'ORDER BY' => "rev_timestamp $dirs",
                'USE INDEX' => [ 'revision' => 'page_timestamp' ],
                'LIMIT' => $limit
            ],
            $revQuery['joins']
        );
    }

    function feed( $type ) {
        if ( !FeedUtils::checkFeedOutput( $type ) ) {
            return;
        }
        $request = $this->getRequest();

        $feedClasses = $this->context->getConfig()->get( 'FeedClasses' );
        $feed = new $feedClasses[$type](
            $this->getTitle()->getPrefixedText() . ' - ' .
            $this->msg( 'history-feed-title' )->inContentLanguage()->text(),
            $this->msg( 'history-feed-description' )->inContentLanguage()->text(),
            $this->getTitle()->getFullURL( 'action=history' )
        );

        // Get a limit on number of feed entries. Provide a sane default
        // of 10 if none is defined (but limit to $wgFeedLimit max)
        $limit = $request->getInt( 'limit', 10 );
        $limit = min(
            max( $limit, 1 ),
            $this->context->getConfig()->get( 'FeedLimit' )
        );

        $items = $this->fetchRevisions( $limit, 0, self::DIR_NEXT );

        // Generate feed elements enclosed between header and footer.
        $feed->outHeader();
        if ( $items->numRows() ) {
            foreach ( $items as $row ) {
                $feed->outItem( $this->feedItem( $row ) );
            }
        } else {
            $feed->outItem( $this->feedEmpty() );
        }
        $feed->outFooter();
    }

    function feedEmpty() {
        return new FeedItem(
            $this->msg( 'nohistory' )->inContentLanguage()->text(),
            $this->msg( 'history-feed-empty' )->inContentLanguage()->parseAsBlock(),
            $this->getTitle()->getFullURL(),
            wfTimestamp( TS_MW ),
            '',
            $this->getTitle()->getTalkPage()->getFullURL()
        );
    }

    function feedItem( $row ) {
        $revisionStore = MediaWikiServices::getInstance()->getRevisionStore();
        $rev = $revisionStore->newRevisionFromRow( $row, 0, $this->getTitle() );
        $prevRev = $revisionStore->getPreviousRevision( $rev );
        $revComment = $rev->getComment() === null ? null : $rev->getComment()->text;
        $text = FeedUtils::formatDiffRow(
            $this->getTitle(),
            $prevRev ? $prevRev->getId() : false,
            $rev->getId(),
            $rev->getTimestamp(),
            $revComment
        );
        $revUserText = $rev->getUser() ? $rev->getUser()->getName() : '';
        if ( $revComment == '' ) {
            $contLang = MediaWikiServices::getInstance()->getContentLanguage();
            $title = $this->msg( 'history-feed-item-nocomment',
                $revUserText,
                $contLang->timeanddate( $rev->getTimestamp() ),
                $contLang->date( $rev->getTimestamp() ),
                $contLang->time( $rev->getTimestamp() )
            )->inContentLanguage()->text();
        } else {
            $title = $revUserText .
                $this->msg( 'colon-separator' )->inContentLanguage()->text() .
                FeedItem::stripComment( $revComment );
        }

        return new FeedItem(
            $title,
            $text,
            $this->getTitle()->getFullURL( 'diff=' . $rev->getId() . '&oldid=prev' ),
            $rev->getTimestamp(),
            $revUserText,
            $this->getTitle()->getTalkPage()->getFullURL()
        );
    }
}