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2
1<?php
2/**
3 * Page history pager
4 *
5 * @license GPL-2.0-or-later
6 * @file
7 * @ingroup Actions
8 */
9
10namespace MediaWiki\Actions\Pager;
11
12use MediaWiki\Actions\HistoryAction;
13use MediaWiki\Cache\LinkBatchFactory;
14use MediaWiki\ChangeTags\ChangeTags;
15use MediaWiki\ChangeTags\ChangeTagsStore;
16use MediaWiki\CommentFormatter\CommentFormatter;
17use MediaWiki\HookContainer\HookContainer;
18use MediaWiki\HookContainer\HookRunner;
19use MediaWiki\Html\Html;
20use MediaWiki\Html\ListToggle;
21use MediaWiki\Linker\Linker;
22use MediaWiki\MainConfigNames;
23use MediaWiki\MediaWikiServices;
24use MediaWiki\Page\Article;
25use MediaWiki\Pager\PagerTools;
26use MediaWiki\Pager\ReverseChronologicalPager;
27use MediaWiki\Parser\Sanitizer;
28use MediaWiki\RecentChanges\ChangesList;
29use MediaWiki\Revision\RevisionRecord;
30use MediaWiki\Revision\RevisionStore;
31use MediaWiki\SpecialPage\SpecialPage;
32use MediaWiki\User\UserIdentityValue;
33use MediaWiki\Watchlist\WatchlistManager;
34use stdClass;
35use Wikimedia\HtmlArmor\HtmlArmor;
36use Wikimedia\MapCacheLRU\MapCacheLRU;
37use Wikimedia\Rdbms\IDBAccessObject;
38use Wikimedia\Timestamp\TimestampException;
39
40/**
41 * @ingroup Pager
42 * @ingroup Actions
43 */
44#[\AllowDynamicProperties]
45class HistoryPager extends ReverseChronologicalPager {
46
47    /** @inheritDoc */
48    public $mGroupByDate = true;
49
50    public string $buttons;
51
52    /** @var int */
53    protected $oldIdChecked;
54
55    /** @var bool */
56    protected $preventClickjacking = false;
57    /**
58     * @var array
59     */
60    protected $parentLens;
61
62    /** @var bool Whether to show the tag editing UI */
63    protected $showTagEditUI;
64
65    protected MapCacheLRU $tagsCache;
66
67    /** @var string|null|false */
68    private $notificationTimestamp;
69
70    private RevisionStore $revisionStore;
71    private LinkBatchFactory $linkBatchFactory;
72    private CommentFormatter $commentFormatter;
73    private HookRunner $hookRunner;
74    private ChangeTagsStore $changeTagsStore;
75
76    /**
77     * @var RevisionRecord[] Revisions, with the key being their result offset
78     */
79    private $revisions = [];
80
81    /**
82     * @var string[] Formatted comments, with the key being their result offset as for $revisions
83     */
84    private $formattedComments = [];
85
86    /**
87     * @param HistoryAction $historyPage
88     * @param int $year
89     * @param int $month
90     * @param int $day
91     * @param ?string $tagFilter
92     * @param bool $tagInvert
93     * @param array $conds
94     * @param LinkBatchFactory|null $linkBatchFactory
95     * @param WatchlistManager|null $watchlistManager
96     * @param CommentFormatter|null $commentFormatter
97     * @param HookContainer|null $hookContainer
98     * @param ChangeTagsStore|null $changeTagsStore
99     */
100    public function __construct(
101        public readonly HistoryAction $historyPage,
102        $year = 0,
103        $month = 0,
104        $day = 0,
105        private readonly ?string $tagFilter = '',
106        public readonly bool $tagInvert = false,
107        public readonly array $conds = [],
108        ?LinkBatchFactory $linkBatchFactory = null,
109        ?WatchlistManager $watchlistManager = null,
110        ?CommentFormatter $commentFormatter = null,
111        ?HookContainer $hookContainer = null,
112        ?ChangeTagsStore $changeTagsStore = null
113    ) {
114        parent::__construct( $historyPage->getContext() );
115        $this->getDateCond( $year, $month, $day );
116        $this->showTagEditUI = ChangeTags::showTagEditingUI( $this->getAuthority() );
117        $this->tagsCache = new MapCacheLRU( 50 );
118        $services = MediaWikiServices::getInstance();
119        $this->revisionStore = $services->getRevisionStore();
120        $this->linkBatchFactory = $linkBatchFactory ?? $services->getLinkBatchFactory();
121        $watchlistManager ??= $services->getWatchlistManager();
122        $this->commentFormatter = $commentFormatter ?? $services->getCommentFormatter();
123        $this->hookRunner = new HookRunner( $hookContainer ?? $services->getHookContainer() );
124        $this->notificationTimestamp = $this->getConfig()->get( MainConfigNames::ShowUpdatedMarker )
125            ? $watchlistManager->getTitleNotificationTimestamp( $this->getUser(), $this->getTitle() )
126            : false;
127        $this->changeTagsStore = $changeTagsStore ?? $services->getChangeTagsStore();
128
129        $this->fixQueryOffset();
130    }
131
132    /**
133     * Fix request offset to use current database time style for query offset
134     * See T345793, T409831
135     */
136    private function fixQueryOffset() {
137        if ( !$this->mOffset ) {
138            return;
139        }
140
141        [ $timestamp, $otherIndex ] = array_pad( explode( '|', $this->mOffset, 2 ), 2, null );
142
143        try {
144            $timestamp = $this->mDb->timestamp( $timestamp );
145            $this->mOffset = $otherIndex !== null ? "$timestamp|$otherIndex" : $timestamp;
146        } catch ( TimestampException ) {
147            // Ignore invalid offsets
148            $this->mOffset = '';
149        }
150    }
151
152    /**
153     * For hook compatibility…
154     */
155    public function getArticle(): Article {
156        return $this->historyPage->getArticle();
157    }
158
159    /** @inheritDoc */
160    protected function getSqlComment() {
161        return $this->conds
162            // potentially slow, see CR r58153
163            ? 'history page filtered'
164            : 'history page unfiltered';
165    }
166
167    /** @inheritDoc */
168    public function getQueryInfo() {
169        $queryBuilder = $this->revisionStore->newSelectQueryBuilder( $this->mDb )
170            ->joinComment()
171            ->joinUser()->field( 'user_id' )
172            ->useIndex( [ 'revision' => 'rev_page_timestamp' ] )
173            ->where( [ 'rev_page' => $this->getWikiPage()->getId() ] )
174            ->andWhere( $this->conds );
175
176        $queryInfo = $queryBuilder->getQueryInfo( 'join_conds' );
177        $this->changeTagsStore->modifyDisplayQuery(
178            $queryInfo['tables'],
179            $queryInfo['fields'],
180            $queryInfo['conds'],
181            $queryInfo['join_conds'],
182            $queryInfo['options'],
183            $this->tagFilter,
184            $this->tagInvert
185        );
186
187        $this->hookRunner->onPageHistoryPager__getQueryInfo( $this, $queryInfo );
188
189        return $queryInfo;
190    }
191
192    /** @inheritDoc */
193    public function getIndexField() {
194        return [ [ 'rev_timestamp', 'rev_id' ] ];
195    }
196
197    protected function doBatchLookups() {
198        if ( !$this->hookRunner->onPageHistoryPager__doBatchLookups( $this, $this->mResult ) ) {
199            return;
200        }
201
202        # Do a link batch query
203        $batch = $this->linkBatchFactory->newLinkBatch()
204            ->setCaller( __METHOD__ );
205        $revIds = [];
206        $title = $this->getTitle();
207        foreach ( $this->mResult as $row ) {
208            if ( $row->rev_parent_id ) {
209                $revIds[] = (int)$row->rev_parent_id;
210            }
211            if ( $row->user_name !== null ) {
212                $batch->addUser( new UserIdentityValue( (int)$row->user_id, $row->user_name ) );
213            } else {
214                # for anons or usernames of imported revisions
215                $batch->add( NS_USER, $row->rev_user_text );
216                $batch->add( NS_USER_TALK, $row->rev_user_text );
217            }
218            $this->revisions[] = $this->revisionStore->newRevisionFromRow(
219                $row,
220                IDBAccessObject::READ_NORMAL,
221                $title
222            );
223        }
224        $this->parentLens = $this->revisionStore->getRevisionSizes( $revIds );
225        $batch->execute();
226
227        # The keys of $this->formattedComments will be the same as the keys of $this->revisions
228        $this->formattedComments = $this->commentFormatter->createRevisionBatch()
229            ->revisions( $this->revisions )
230            ->authority( $this->getAuthority() )
231            ->samePage( false )
232            ->hideIfDeleted( true )
233            ->useParentheses( false )
234            ->execute();
235
236        $this->mResult->seek( 0 );
237    }
238
239    /**
240     * Returns message when query returns no revisions
241     * @return string escaped message
242     */
243    protected function getEmptyBody() {
244        return $this->msg( 'history-empty' )->escaped();
245    }
246
247    /**
248     * Creates the beginning of history list with a submit button
249     *
250     * @return string HTML output
251     */
252    protected function getStartBody() {
253        $this->oldIdChecked = 0;
254        $s = '';
255        // Button container stored in $this->buttons for re-use in getEndBody()
256        $this->buttons = '';
257        if ( $this->getNumRows() > 0 ) {
258            $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
259            // Main form for comparing revisions
260            $s = Html::openElement( 'form', [
261                'action' => wfScript(),
262                'id' => 'mw-history-compare'
263            ] ) . "\n";
264            $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
265
266            $this->buttons .= Html::openElement(
267                'div', [ 'class' => 'mw-history-compareselectedversions' ] );
268            $className = 'historysubmit mw-history-compareselectedversions-button cdx-button';
269            $attrs = [ 'class' => $className ]
270                + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' );
271            $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
272                $attrs
273            ) . "\n";
274
275            $actionButtons = '';
276            if ( $this->getAuthority()->isAllowed( 'deleterevision' ) ) {
277                $actionButtons .= $this->getRevisionButton(
278                    'Revisiondelete', 'showhideselectedversions', 'mw-history-revisiondelete-button'
279                );
280            }
281            if ( $this->showTagEditUI ) {
282                $actionButtons .= $this->getRevisionButton(
283                    'EditTags', 'history-edit-tags', 'mw-history-editchangetags-button'
284                );
285            }
286            if ( $actionButtons ) {
287                // Prepend a mini-form for changing visibility and editing tags.
288                // Checkboxes and buttons are associated with it using the <input form="…"> attribute.
289                //
290                // This makes the submitted parameters cleaner (on supporting browsers - all except IE 11):
291                // the 'mw-history-compare' form submission will omit the `ids[…]` parameters, and the
292                // 'mw-history-revisionactions' form submission will omit the `diff` and `oldid` parameters.
293                $s = Html::rawElement( 'form', [
294                    'action' => wfScript(),
295                    'id' => 'mw-history-revisionactions',
296                ] ) . "\n" . $s;
297                $s .= Html::hidden( 'type', 'revision', [ 'form' => 'mw-history-revisionactions' ] ) . "\n";
298
299                $this->buttons .= Html::rawElement( 'div', [ 'class' =>
300                    'mw-history-revisionactions' ], $actionButtons );
301            }
302
303            if ( $this->showTagEditUI || $this->getAuthority()->isAllowed( 'deleterevision' ) ) {
304                $this->buttons .= ( new ListToggle( $this->getOutput() ) )->getHTML();
305            }
306
307            $this->buttons .= '</div>';
308
309            $s .= $this->buttons;
310        }
311
312        $s .= '<section id="pagehistory" class="mw-pager-body">';
313
314        return $s;
315    }
316
317    private function getRevisionButton( string $name, string $msg, string $class ): string {
318        $this->preventClickjacking = true;
319        return Html::element(
320            'button',
321            [
322                'type' => 'submit',
323                'name' => 'title',
324                'value' => SpecialPage::getTitleFor( $name )->getPrefixedDBkey(),
325                'class' => [ 'cdx-button', $class, 'historysubmit' ],
326                'form' => 'mw-history-revisionactions',
327            ],
328            $this->msg( $msg )->text()
329        ) . "\n";
330    }
331
332    /** @inheritDoc */
333    protected function getEndBody() {
334        if ( $this->getNumRows() === 0 ) {
335            return '';
336        }
337        $s = '';
338        if ( $this->getNumRows() > 2 ) {
339            $s .= $this->buttons;
340        }
341        // closes section#pagehistory
342        $s .= '</section>';
343        $s .= '</form>';
344        return $s;
345    }
346
347    /**
348     * Creates a submit button
349     *
350     * @param string $message Text of the submit button, will be escaped
351     * @param array $attributes
352     * @return string HTML output for the submit button
353     */
354    private function submitButton( string $message, $attributes = [] ): string {
355        # Disable the submit button if history has 1 revision only
356        if ( $this->getNumRows() > 1 ) {
357            return Html::submitButton( $message, $attributes );
358        }
359
360        return '';
361    }
362
363    /**
364     * Returns a row from the history printout.
365     *
366     * @param stdClass $row The database row corresponding to the current line.
367     * @return string HTML output for the row
368     */
369    public function formatRow( $row ) {
370        $resultOffset = $this->getResultOffset();
371        $numRows = min( $this->mResult->numRows(), $this->mLimit );
372
373        $firstInList = $resultOffset === ( $this->mIsBackwards ? $numRows - 1 : 0 );
374        // Next in the list, previous in chronological order.
375        $nextResultOffset = $resultOffset + ( $this->mIsBackwards ? -1 : 1 );
376
377        $revRecord = $this->revisions[$resultOffset];
378        // This may only be null if the current line is the last one in the list.
379        $previousRevRecord = $this->revisions[$nextResultOffset] ?? null;
380
381        $latest = $revRecord->getId() === $this->getWikiPage()->getLatest();
382        $curlink = $this->curLink( $revRecord );
383        if ( $previousRevRecord ) {
384            // Display a link to compare to the previous revision
385            $lastlink = $this->lastLink( $revRecord, $previousRevRecord );
386        } elseif ( $this->mIsBackwards && $this->mOffset !== '' ) {
387            // When paging "backwards", we don't have the extra result for the next revision that would
388            // appear in the list, and we don't know whether this is the oldest revision or not.
389            // However, if an offset has been specified, then the user probably reached this page by
390            // navigating from the "next" page, therefore the next revision probably exists.
391            // Display a link using &oldid=prev (this skips some checks but that's fine).
392            $lastlink = $this->lastLink( $revRecord, null );
393        } else {
394            // Do not display a link, because this is the oldest revision of the page
395            // @phan-suppress-next-line SecurityCheck-DoubleEscaped
396            $lastlink = Html::element( 'span', [
397                'class' => 'mw-history-histlinks-previous',
398            ], $this->historyPage->message['last'] );
399        }
400        $curLastlinks = Html::rawElement( 'span', [], $curlink ) .
401            Html::rawElement( 'span', [], $lastlink );
402        $histLinks = Html::rawElement(
403            'span',
404            [ 'class' => 'mw-history-histlinks mw-changeslist-links' ],
405            $curLastlinks
406        );
407
408        $diffButtons = $this->diffButtons( $revRecord, $firstInList );
409        $s = $histLinks . $diffButtons;
410
411        $link = $this->revLink( $revRecord );
412        $classes = [];
413
414        $del = '';
415        $canRevDelete = $this->getAuthority()->isAllowed( 'deleterevision' );
416        // Show checkboxes for each revision, to allow for revision deletion and
417        // change tags
418        if ( $canRevDelete || $this->showTagEditUI ) {
419            $this->preventClickjacking = true;
420            // If revision was hidden from sysops and we don't need the checkbox
421            // for anything else, disable it
422            if ( !$this->showTagEditUI
423                && !$revRecord->userCan( RevisionRecord::DELETED_RESTRICTED, $this->getAuthority() )
424            ) {
425                $del = Html::check( 'deleterevisions', false, [ 'disabled' => 'disabled' ] );
426            // Otherwise, enable the checkbox…
427            } else {
428                $del = Html::check(
429                    'ids[' . $revRecord->getId() . ']', false,
430                    [ 'form' => 'mw-history-revisionactions' ]
431                );
432            }
433        // User can only view deleted revisions…
434        } elseif ( $revRecord->getVisibility() && $this->getAuthority()->isAllowed( 'deletedhistory' ) ) {
435            // If revision was hidden from sysops, disable the link
436            if ( !$revRecord->userCan( RevisionRecord::DELETED_RESTRICTED, $this->getAuthority() ) ) {
437                $del = Linker::revDeleteLinkDisabled( false );
438            // Otherwise, show the link…
439            } else {
440                $query = [
441                    'type' => 'revision',
442                    'target' => $this->getTitle()->getPrefixedDBkey(),
443                    'ids' => $revRecord->getId()
444                ];
445                $del .= Linker::revDeleteLink(
446                    $query,
447                    $revRecord->isDeleted( RevisionRecord::DELETED_RESTRICTED ),
448                    false
449                );
450            }
451        }
452        if ( $del ) {
453            $s .= " $del ";
454        }
455
456        $lang = $this->getLanguage();
457        $s .= ' ' . Html::rawElement( 'bdi', [ 'dir' => $lang->getDir() ], $link );
458        $s .= " <span class='history-user'>" .
459            Linker::revUserTools( $revRecord, true, false ) . "</span>";
460
461        if ( $revRecord->isMinor() ) {
462            $s .= ' ' . ChangesList::flag( 'minor', $this->getContext() );
463        }
464
465        # Sometimes rev_len isn't populated
466        if ( $revRecord->getSize() !== null ) {
467            # Size is always public data
468            $prevSize = $this->parentLens[$row->rev_parent_id] ?? 0;
469            $sDiff = ChangesList::showCharacterDifference( $prevSize, $revRecord->getSize() );
470            $fSize = Linker::formatRevisionSize( $revRecord->getSize() );
471            $s .= ' <span class="mw-changeslist-separator"></span> ' . "$fSize $sDiff";
472        }
473
474        # Include separator between character difference and following text
475        $s .= ' <span class="mw-changeslist-separator"></span> ';
476
477        # Text following the character difference is added just before running hooks
478        $comment = $this->formattedComments[$resultOffset];
479
480        if ( $comment === '' ) {
481            $defaultComment = $this->historyPage->message['changeslist-nocomment'];
482            $comment = "<span class=\"comment mw-comment-none\">$defaultComment</span>";
483        }
484        $s .= $comment;
485
486        if ( $this->notificationTimestamp && $row->rev_timestamp >= $this->notificationTimestamp ) {
487            $s .= ' <span class="updatedmarker">' . $this->historyPage->message['updatedmarker'] . '</span>';
488            $classes[] = 'mw-history-line-updated';
489        }
490
491        $pagerTools = new PagerTools(
492            $revRecord,
493            $previousRevRecord,
494            $latest && $previousRevRecord,
495            $this->hookRunner,
496            $this->getTitle(),
497            $this->getContext(),
498            $this->getLinkRenderer()
499        );
500        if ( $pagerTools->shouldPreventClickjacking() ) {
501            $this->preventClickjacking = true;
502        }
503        $s .= $pagerTools->toHTML();
504
505        # Tags
506        [ $tagSummary, $newClasses ] = $this->tagsCache->getWithSetCallback(
507            $this->tagsCache->makeKey(
508                $row->ts_tags ?? '',
509                $this->getUser()->getName(),
510                $lang->getCode()
511            ),
512            fn () => ChangeTags::formatSummaryRow(
513                $row->ts_tags,
514                'history',
515                $this->getContext()
516            )
517        );
518        $classes = array_merge( $classes, $newClasses );
519        if ( $tagSummary !== '' ) {
520            $s .= " $tagSummary";
521        }
522
523        $attribs = [ 'data-mw-revid' => $revRecord->getId() ];
524
525        $this->hookRunner->onPageHistoryLineEnding( $this, $row, $s, $classes, $attribs );
526        $attribs = array_filter( $attribs,
527            Sanitizer::isReservedDataAttribute( ... ),
528            ARRAY_FILTER_USE_KEY
529        );
530        $attribs['class'] = $classes;
531
532        return Html::rawElement( 'li', $attribs, $s ) . "\n";
533    }
534
535    /**
536     * Create a link to view this revision of the page
537     */
538    private function revLink( RevisionRecord $rev ): string {
539        return ChangesList::revDateLink( $rev, $this->getAuthority(), $this->getLanguage(),
540            $this->getTitle() );
541    }
542
543    /**
544     * Create a diff-to-current link for this revision for this page
545     */
546    private function curLink( RevisionRecord $rev ): string {
547        $cur = $this->historyPage->message['cur'];
548        $latest = $this->getWikiPage()->getLatest();
549        if ( $latest === $rev->getId()
550            || !$rev->userCan( RevisionRecord::DELETED_TEXT, $this->getAuthority() )
551        ) {
552            // @phan-suppress-next-line SecurityCheck-DoubleEscaped
553            return Html::element( 'span', [
554                'class' => 'mw-history-histlinks-current',
555            ], $cur );
556        }
557
558        return $this->getLinkRenderer()->makeKnownLink(
559            $this->getTitle(),
560            new HtmlArmor( $cur ),
561            [
562                'class' => 'mw-history-histlinks-current',
563                'title' => $this->historyPage->message['tooltip-cur']
564            ],
565            [
566                'diff' => $latest,
567                'oldid' => $rev->getId()
568            ]
569        );
570    }
571
572    /**
573     * Create a diff-to-previous link for this revision for this page.
574     *
575     * @param RevisionRecord $prevRev The revision being displayed
576     * @param RevisionRecord|null $nextRev The next revision in list (that is the previous one in
577     *        chronological order) or null if it is unknown, but a link should be created anyway.
578     * @return string
579     */
580    private function lastLink( RevisionRecord $prevRev, ?RevisionRecord $nextRev ): string {
581        $last = $this->historyPage->message['last'];
582
583        if ( !$prevRev->userCan( RevisionRecord::DELETED_TEXT, $this->getAuthority() ) ||
584            ( $nextRev && !$nextRev->userCan( RevisionRecord::DELETED_TEXT, $this->getAuthority() ) )
585        ) {
586            // @phan-suppress-next-line SecurityCheck-DoubleEscaped
587            return Html::element( 'span', [
588                'class' => 'mw-history-histlinks-previous',
589            ], $last );
590        }
591
592        return $this->getLinkRenderer()->makeKnownLink(
593            $this->getTitle(),
594            new HtmlArmor( $last ),
595            [
596                'class' => 'mw-history-histlinks-previous',
597                'title' => $this->historyPage->message['tooltip-last']
598            ],
599            [
600                // T243569
601                'diff' => 'prev',
602                'oldid' => $prevRev->getId()
603            ]
604        );
605    }
606
607    /**
608     * Create radio buttons for page history
609     *
610     * @param RevisionRecord $rev
611     * @param bool $firstInList Is this version the first one?
612     *
613     * @return string HTML output for the radio buttons
614     */
615    private function diffButtons( RevisionRecord $rev, bool $firstInList ): string {
616        if ( $this->getNumRows() > 1 ) {
617            $id = $rev->getId();
618            $radio = [ 'type' => 'radio', 'value' => $id ];
619            /** @todo Move title texts to javascript */
620            if ( $firstInList ) {
621                $first = Html::element( 'input',
622                    [
623                        ...$radio,
624                        // Disable the hidden radio because it can still
625                        // be selected with arrow keys on Firefox
626                        'disabled' => '',
627                        'name' => 'oldid',
628                        'id' => 'mw-oldid-null'
629                    ]
630                );
631                $checkmark = [ 'checked' => 'checked' ];
632            } else {
633                # Check visibility of old revisions
634                if ( !$rev->userCan( RevisionRecord::DELETED_TEXT, $this->getAuthority() ) ) {
635                    $radio['disabled'] = 'disabled';
636                    // We will check the next possible one
637                    $checkmark = [];
638                } elseif ( !$this->oldIdChecked ) {
639                    $checkmark = [ 'checked' => 'checked' ];
640                    $this->oldIdChecked = $id;
641                } else {
642                    $checkmark = [];
643                }
644                $first = Html::element( 'input',
645                    [
646                        ...$radio,
647                        ...$checkmark,
648                        'name' => 'oldid',
649                        'id' => "mw-oldid-$id"
650                    ]
651                );
652                $checkmark = [];
653            }
654            $second = Html::element( 'input',
655                [
656                    ...$radio,
657                    ...$checkmark,
658                    'name' => 'diff',
659                    'id' => "mw-diff-$id"
660                ]
661            );
662
663            return $first . $second;
664        }
665
666        return '';
667    }
668
669    /**
670     * Returns whether to show the "navigation bar"
671     *
672     * @return bool
673     */
674    protected function isNavigationBarShown() {
675        if ( $this->getNumRows() === 0 ) {
676            return false;
677        }
678        return parent::isNavigationBarShown();
679    }
680
681    /**
682     * Get the "prevent clickjacking" flag
683     */
684    public function getPreventClickjacking(): bool {
685        return $this->preventClickjacking;
686    }
687
688}
689
690/** @deprecated class alias since 1.41 */
691class_alias( HistoryPager::class, 'HistoryPager' );
692
693/** @deprecated class alias since 1.46 */
694class_alias( HistoryPager::class, 'MediaWiki\\Pager\\HistoryPager' );