includes/actions/HistoryAction.php

   1 <?php
   2 /**
   3  * Page history
   4  *
   5  * Split off from Article.php and Skin.php, 2003-12-22
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  * @ingroup Actions
  24  */
  25
  26 use MediaWiki\MediaWikiServices;
  27 use Wikimedia\Rdbms\ResultWrapper;
  28 use Wikimedia\Rdbms\FakeResultWrapper;
  29
  30 /**
  31  * This class handles printing the history page for an article. In order to
  32  * be efficient, it uses timestamps rather than offsets for paging, to avoid
  33  * costly LIMIT,offset queries.
  34  *
  35  * Construct it by passing in an Article, and call $h->history() to print the
  36  * history.
  37  *
  38  * @ingroup Actions
  39  */
  40 class HistoryAction extends FormlessAction {
  41         const DIR_PREV = 0;
  42         const DIR_NEXT = 1;
  43
  44         /** @var array Array of message keys and strings */
  45         public $message;
  46
  47         public function getName() {
  48                 return 'history';
  49         }
  50
  51         public function requiresWrite() {
  52                 return false;
  53         }
  54
  55         public function requiresUnblock() {
  56                 return false;
  57         }
  58
  59         protected function getPageTitle() {
  60                 return $this->msg( 'history-title', $this->getTitle()->getPrefixedText() )->text();
  61         }
  62
  63         protected function getDescription() {
  64                 // Creation of a subtitle link pointing to [[Special:Log]]
  65                 return MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
  66                         SpecialPage::getTitleFor( 'Log' ),
  67                         $this->msg( 'viewpagelogs' )->text(),
  68                         [],
  69                         [ 'page' => $this->getTitle()->getPrefixedText() ]
  70                 );
  71         }
  72
  73         /**
  74          * @return WikiPage|Article|ImagePage|CategoryPage|Page The Article object we are working on.
  75          */
  76         public function getArticle() {
  77                 return $this->page;
  78         }
  79
  80         /**
  81          * As we use the same small set of messages in various methods and that
  82          * they are called often, we call them once and save them in $this->message
  83          */
  84         private function preCacheMessages() {
  85                 // Precache various messages
  86                 if ( !isset( $this->message ) ) {
  87                         $msgs = [ 'cur', 'last', 'pipe-separator' ];
  88                         foreach ( $msgs as $msg ) {
  89                                 $this->message[$msg] = $this->msg( $msg )->escaped();
  90                         }
  91                 }
  92         }
  93
  94         /**
  95          * Print the history page for an article.
  96          */
  97         function onView() {
  98                 $out = $this->getOutput();
  99                 $request = $this->getRequest();
 100
 101                 /**
 102                  * Allow client caching.
 103                  */
 104                 if ( $out->checkLastModified( $this->page->getTouched() ) ) {
 105                         return; // Client cache fresh and headers sent, nothing more to do.
 106                 }
 107
 108                 $this->preCacheMessages();
 109                 $config = $this->context->getConfig();
 110
 111                 # Fill in the file cache if not set already
 112                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
 113                         $cache = new HTMLFileCache( $this->getTitle(), 'history' );
 114                         if ( !$cache->isCacheGood( /* Assume up to date */ ) ) {
 115                                 ob_start( [ &$cache, 'saveToFileCache' ] );
 116                         }
 117                 }
 118
 119                 // Setup page variables.
 120                 $out->setFeedAppendQuery( 'action=history' );
 121                 $out->addModules( 'mediawiki.action.history' );
 122                 $out->addModuleStyles( [
 123                         'mediawiki.action.history.styles',
 124                         'mediawiki.special.changeslist',
 125                 ] );
 126                 if ( $config->get( 'UseMediaWikiUIEverywhere' ) ) {
 127                         $out = $this->getOutput();
 128                         $out->addModuleStyles( [
 129                                 'mediawiki.ui.input',
 130                                 'mediawiki.ui.checkbox',
 131                         ] );
 132                 }
 133
 134                 // Handle atom/RSS feeds.
 135                 $feedType = $request->getVal( 'feed' );
 136                 if ( $feedType ) {
 137                         $this->feed( $feedType );
 138
 139                         return;
 140                 }
 141
 142                 $this->addHelpLink( '//meta.wikimedia.org/wiki/Special:MyLanguage/Help:Page_history', true );
 143
 144                 // Fail nicely if article doesn't exist.
 145                 if ( !$this->page->exists() ) {
 146                         global $wgSend404Code;
 147                         if ( $wgSend404Code ) {
 148                                 $out->setStatusCode( 404 );
 149                         }
 150                         $out->addWikiMsg( 'nohistory' );
 151
 152                         $dbr = wfGetDB( DB_REPLICA );
 153
 154                         # show deletion/move log if there is an entry
 155                         LogEventsList::showLogExtract(
 156                                 $out,
 157                                 [ 'delete', 'move' ],
 158                                 $this->getTitle(),
 159                                 '',
 160                                 [ 'lim' => 10,
 161                                         'conds' => [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ],
 162                                         'showIfEmpty' => false,
 163                                         'msgKey' => [ 'moveddeleted-notice' ]
 164                                 ]
 165                         );
 166
 167                         return;
 168                 }
 169
 170                 /**
 171                  * Add date selector to quickly get to a certain time
 172                  */
 173                 $year = $request->getInt( 'year' );
 174                 $month = $request->getInt( 'month' );
 175                 $tagFilter = $request->getVal( 'tagfilter' );
 176                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter, false, $this->getContext() );
 177
 178                 /**
 179                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 180                  */
 181                 if ( $request->getBool( 'deleted' ) ) {
 182                         $conds = [ 'rev_deleted != 0' ];
 183                 } else {
 184                         $conds = [];
 185                 }
 186                 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
 187                         $checkDeleted = Xml::checkLabel( $this->msg( 'history-show-deleted' )->text(),
 188                                 'deleted', 'mw-show-deleted-only', $request->getBool( 'deleted' ) ) . "\n";
 189                 } else {
 190                         $checkDeleted = '';
 191                 }
 192
 193                 // Add the general form
 194                 $action = htmlspecialchars( wfScript() );
 195                 $out->addHTML(
 196                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 197                         Xml::fieldset(
 198                                 $this->msg( 'history-fieldset-title' )->text(),
 199                                 false,
 200                                 [ 'id' => 'mw-history-search' ]
 201                         ) .
 202                         Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n" .
 203                         Html::hidden( 'action', 'history' ) . "\n" .
 204                         Xml::dateMenu(
 205                                 ( $year == null ? MWTimestamp::getLocalInstance()->format( 'Y' ) : $year ),
 206                                 $month
 207                         ) . '&#160;' .
 208                         ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
 209                         $checkDeleted .
 210                         Html::submitButton(
 211                                 $this->msg( 'historyaction-submit' )->text(),
 212                                 [],
 213                                 [ 'mw-ui-progressive' ]
 214                         ) . "\n" .
 215                         '</fieldset></form>'
 216                 );
 217
 218                 Hooks::run( 'PageHistoryBeforeList', [ &$this->page, $this->getContext() ] );
 219
 220                 // Create and output the list.
 221                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 222                 $out->addHTML(
 223                         $pager->getNavigationBar() .
 224                         $pager->getBody() .
 225                         $pager->getNavigationBar()
 226                 );
 227                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 228         }
 229
 230         /**
 231          * Fetch an array of revisions, specified by a given limit, offset and
 232          * direction. This is now only used by the feeds. It was previously
 233          * used by the main UI but that's now handled by the pager.
 234          *
 235          * @param int $limit The limit number of revisions to get
 236          * @param int $offset
 237          * @param int $direction Either self::DIR_PREV or self::DIR_NEXT
 238          * @return ResultWrapper
 239          */
 240         function fetchRevisions( $limit, $offset, $direction ) {
 241                 // Fail if article doesn't exist.
 242                 if ( !$this->getTitle()->exists() ) {
 243                         return new FakeResultWrapper( [] );
 244                 }
 245
 246                 $dbr = wfGetDB( DB_REPLICA );
 247
 248                 if ( $direction === self::DIR_PREV ) {
 249                         list( $dirs, $oper ) = [ "ASC", ">=" ];
 250                 } else { /* $direction === self::DIR_NEXT */
 251                         list( $dirs, $oper ) = [ "DESC", "<=" ];
 252                 }
 253
 254                 if ( $offset ) {
 255                         $offsets = [ "rev_timestamp $oper " . $dbr->addQuotes( $dbr->timestamp( $offset ) ) ];
 256                 } else {
 257                         $offsets = [];
 258                 }
 259
 260                 $page_id = $this->page->getId();
 261
 262                 return $dbr->select( 'revision',
 263                         Revision::selectFields(),
 264                         array_merge( [ 'rev_page' => $page_id ], $offsets ),
 265                         __METHOD__,
 266                         [ 'ORDER BY' => "rev_timestamp $dirs",
 267                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit ]
 268                 );
 269         }
 270
 271         /**
 272          * Output a subscription feed listing recent edits to this page.
 273          *
 274          * @param string $type Feed type
 275          */
 276         function feed( $type ) {
 277                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 278                         return;
 279                 }
 280                 $request = $this->getRequest();
 281
 282                 $feedClasses = $this->context->getConfig()->get( 'FeedClasses' );
 283                 /** @var RSSFeed|AtomFeed $feed */
 284                 $feed = new $feedClasses[$type](
 285                         $this->getTitle()->getPrefixedText() . ' - ' .
 286                         $this->msg( 'history-feed-title' )->inContentLanguage()->text(),
 287                         $this->msg( 'history-feed-description' )->inContentLanguage()->text(),
 288                         $this->getTitle()->getFullURL( 'action=history' )
 289                 );
 290
 291                 // Get a limit on number of feed entries. Provide a sane default
 292                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 293                 $limit = $request->getInt( 'limit', 10 );
 294                 $limit = min(
 295                         max( $limit, 1 ),
 296                         $this->context->getConfig()->get( 'FeedLimit' )
 297                 );
 298
 299                 $items = $this->fetchRevisions( $limit, 0, self::DIR_NEXT );
 300
 301                 // Generate feed elements enclosed between header and footer.
 302                 $feed->outHeader();
 303                 if ( $items->numRows() ) {
 304                         foreach ( $items as $row ) {
 305                                 $feed->outItem( $this->feedItem( $row ) );
 306                         }
 307                 } else {
 308                         $feed->outItem( $this->feedEmpty() );
 309                 }
 310                 $feed->outFooter();
 311         }
 312
 313         function feedEmpty() {
 314                 return new FeedItem(
 315                         $this->msg( 'nohistory' )->inContentLanguage()->text(),
 316                         $this->msg( 'history-feed-empty' )->inContentLanguage()->parseAsBlock(),
 317                         $this->getTitle()->getFullURL(),
 318                         wfTimestamp( TS_MW ),
 319                         '',
 320                         $this->getTitle()->getTalkPage()->getFullURL()
 321                 );
 322         }
 323
 324         /**
 325          * Generate a FeedItem object from a given revision table row
 326          * Borrows Recent Changes' feed generation functions for formatting;
 327          * includes a diff to the previous revision (if any).
 328          *
 329          * @param stdClass|array $row Database row
 330          * @return FeedItem
 331          */
 332         function feedItem( $row ) {
 333                 $rev = new Revision( $row );
 334                 $rev->setTitle( $this->getTitle() );
 335                 $text = FeedUtils::formatDiffRow(
 336                         $this->getTitle(),
 337                         $this->getTitle()->getPreviousRevisionID( $rev->getId() ),
 338                         $rev->getId(),
 339                         $rev->getTimestamp(),
 340                         $rev->getComment()
 341                 );
 342                 if ( $rev->getComment() == '' ) {
 343                         global $wgContLang;
 344                         $title = $this->msg( 'history-feed-item-nocomment',
 345                                 $rev->getUserText(),
 346                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 347                                 $wgContLang->date( $rev->getTimestamp() ),
 348                                 $wgContLang->time( $rev->getTimestamp() ) )->inContentLanguage()->text();
 349                 } else {
 350                         $title = $rev->getUserText() .
 351                                 $this->msg( 'colon-separator' )->inContentLanguage()->text() .
 352                                 FeedItem::stripComment( $rev->getComment() );
 353                 }
 354
 355                 return new FeedItem(
 356                         $title,
 357                         $text,
 358                         $this->getTitle()->getFullURL( 'diff=' . $rev->getId() . '&oldid=prev' ),
 359                         $rev->getTimestamp(),
 360                         $rev->getUserText(),
 361                         $this->getTitle()->getTalkPage()->getFullURL()
 362                 );
 363         }
 364 }
 365
 366 /**
 367  * @ingroup Pager
 368  * @ingroup Actions
 369  */
 370 class HistoryPager extends ReverseChronologicalPager {
 371         /**
 372          * @var bool|stdClass
 373          */
 374         public $lastRow = false;
 375
 376         public $counter, $historyPage, $buttons, $conds;
 377
 378         protected $oldIdChecked;
 379
 380         protected $preventClickjacking = false;
 381         /**
 382          * @var array
 383          */
 384         protected $parentLens;
 385
 386         /** @var bool Whether to show the tag editing UI */
 387         protected $showTagEditUI;
 388
 389         /**
 390          * @param HistoryAction $historyPage
 391          * @param string $year
 392          * @param string $month
 393          * @param string $tagFilter
 394          * @param array $conds
 395          */
 396         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = [] ) {
 397                 parent::__construct( $historyPage->getContext() );
 398                 $this->historyPage = $historyPage;
 399                 $this->tagFilter = $tagFilter;
 400                 $this->getDateCond( $year, $month );
 401                 $this->conds = $conds;
 402                 $this->showTagEditUI = ChangeTags::showTagEditingUI( $this->getUser() );
 403         }
 404
 405         // For hook compatibility...
 406         function getArticle() {
 407                 return $this->historyPage->getArticle();
 408         }
 409
 410         function getSqlComment() {
 411                 if ( $this->conds ) {
 412                         return 'history page filtered'; // potentially slow, see CR r58153
 413                 } else {
 414                         return 'history page unfiltered';
 415                 }
 416         }
 417
 418         function getQueryInfo() {
 419                 $queryInfo = [
 420                         'tables' => [ 'revision', 'user' ],
 421                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 422                         'conds' => array_merge(
 423                                 [ 'rev_page' => $this->getWikiPage()->getId() ],
 424                                 $this->conds ),
 425                         'options' => [ 'USE INDEX' => [ 'revision' => 'page_timestamp' ] ],
 426                         'join_conds' => [ 'user' => Revision::userJoinCond() ],
 427                 ];
 428                 ChangeTags::modifyDisplayQuery(
 429                         $queryInfo['tables'],
 430                         $queryInfo['fields'],
 431                         $queryInfo['conds'],
 432                         $queryInfo['join_conds'],
 433                         $queryInfo['options'],
 434                         $this->tagFilter
 435                 );
 436
 437                 // Avoid PHP 7.1 warning of passing $this by reference
 438                 $historyPager = $this;
 439                 Hooks::run( 'PageHistoryPager::getQueryInfo', [ &$historyPager, &$queryInfo ] );
 440
 441                 return $queryInfo;
 442         }
 443
 444         function getIndexField() {
 445                 return 'rev_timestamp';
 446         }
 447
 448         /**
 449          * @param stdClass $row
 450          * @return string
 451          */
 452         function formatRow( $row ) {
 453                 if ( $this->lastRow ) {
 454                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 455                         $firstInList = $this->counter == 1;
 456                         $this->counter++;
 457
 458                         $notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 459                                 ? $this->getTitle()->getNotificationTimestamp( $this->getUser() )
 460                                 : false;
 461
 462                         $s = $this->historyLine(
 463                                 $this->lastRow, $row, $notifTimestamp, $latest, $firstInList );
 464                 } else {
 465                         $s = '';
 466                 }
 467                 $this->lastRow = $row;
 468
 469                 return $s;
 470         }
 471
 472         function doBatchLookups() {
 473                 if ( !Hooks::run( 'PageHistoryPager::doBatchLookups', [ $this, $this->mResult ] ) ) {
 474                         return;
 475                 }
 476
 477                 # Do a link batch query
 478                 $this->mResult->seek( 0 );
 479                 $batch = new LinkBatch();
 480                 $revIds = [];
 481                 foreach ( $this->mResult as $row ) {
 482                         if ( $row->rev_parent_id ) {
 483                                 $revIds[] = $row->rev_parent_id;
 484                         }
 485                         if ( !is_null( $row->user_name ) ) {
 486                                 $batch->add( NS_USER, $row->user_name );
 487                                 $batch->add( NS_USER_TALK, $row->user_name );
 488                         } else { # for anons or usernames of imported revisions
 489                                 $batch->add( NS_USER, $row->rev_user_text );
 490                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 491                         }
 492                 }
 493                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 494                 $batch->execute();
 495                 $this->mResult->seek( 0 );
 496         }
 497
 498         /**
 499          * Creates begin of history list with a submit button
 500          *
 501          * @return string HTML output
 502          */
 503         function getStartBody() {
 504                 $this->lastRow = false;
 505                 $this->counter = 1;
 506                 $this->oldIdChecked = 0;
 507
 508                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 509                 $s = Html::openElement( 'form', [ 'action' => wfScript(),
 510                         'id' => 'mw-history-compare' ] ) . "\n";
 511                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 512                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 513                 $s .= Html::hidden( 'type', 'revision' ) . "\n";
 514
 515                 // Button container stored in $this->buttons for re-use in getEndBody()
 516                 $this->buttons = '<div>';
 517                 $className = 'historysubmit mw-history-compareselectedversions-button';
 518                 $attrs = [ 'class' => $className ]
 519                         + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' );
 520                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 521                         $attrs
 522                 ) . "\n";
 523
 524                 $user = $this->getUser();
 525                 $actionButtons = '';
 526                 if ( $user->isAllowed( 'deleterevision' ) ) {
 527                         $actionButtons .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 528                 }
 529                 if ( $this->showTagEditUI ) {
 530                         $actionButtons .= $this->getRevisionButton( 'editchangetags', 'history-edit-tags' );
 531                 }
 532                 if ( $actionButtons ) {
 533                         $this->buttons .= Xml::tags( 'div', [ 'class' =>
 534                                 'mw-history-revisionactions' ], $actionButtons );
 535                 }
 536
 537                 if ( $user->isAllowed( 'deleterevision' ) || $this->showTagEditUI ) {
 538                         $this->buttons .= ( new ListToggle( $this->getOutput() ) )->getHTML();
 539                 }
 540
 541                 $this->buttons .= '</div>';
 542
 543                 $s .= $this->buttons;
 544                 $s .= '<ul id="pagehistory">' . "\n";
 545
 546                 return $s;
 547         }
 548
 549         private function getRevisionButton( $name, $msg ) {
 550                 $this->preventClickjacking();
 551                 # Note bug #20966, <button> is non-standard in IE<8
 552                 $element = Html::element(
 553                         'button',
 554                         [
 555                                 'type' => 'submit',
 556                                 'name' => $name,
 557                                 'value' => '1',
 558                                 'class' => "historysubmit mw-history-$name-button",
 559                         ],
 560                         $this->msg( $msg )->text()
 561                 ) . "\n";
 562                 return $element;
 563         }
 564
 565         function getEndBody() {
 566                 if ( $this->lastRow ) {
 567                         $latest = $this->counter == 1 && $this->mIsFirst;
 568                         $firstInList = $this->counter == 1;
 569                         if ( $this->mIsBackwards ) {
 570                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 571                                 if ( $this->mOffset == '' ) {
 572                                         $next = null;
 573                                 } else {
 574                                         $next = 'unknown';
 575                                 }
 576                         } else {
 577                                 # The next row is the past-the-end row
 578                                 $next = $this->mPastTheEndRow;
 579                         }
 580                         $this->counter++;
 581
 582                         $notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 583                                 ? $this->getTitle()->getNotificationTimestamp( $this->getUser() )
 584                                 : false;
 585
 586                         $s = $this->historyLine(
 587                                 $this->lastRow, $next, $notifTimestamp, $latest, $firstInList );
 588                 } else {
 589                         $s = '';
 590                 }
 591                 $s .= "</ul>\n";
 592                 # Add second buttons only if there is more than one rev
 593                 if ( $this->getNumRows() > 2 ) {
 594                         $s .= $this->buttons;
 595                 }
 596                 $s .= '</form>';
 597
 598                 return $s;
 599         }
 600
 601         /**
 602          * Creates a submit button
 603          *
 604          * @param string $message Text of the submit button, will be escaped
 605          * @param array $attributes Attributes
 606          * @return string HTML output for the submit button
 607          */
 608         function submitButton( $message, $attributes = [] ) {
 609                 # Disable submit button if history has 1 revision only
 610                 if ( $this->getNumRows() > 1 ) {
 611                         return Html::submitButton( $message, $attributes );
 612                 } else {
 613                         return '';
 614                 }
 615         }
 616
 617         /**
 618          * Returns a row from the history printout.
 619          *
 620          * @todo document some more, and maybe clean up the code (some params redundant?)
 621          *
 622          * @param stdClass $row The database row corresponding to the previous line.
 623          * @param mixed $next The database row corresponding to the next line
 624          *   (chronologically previous)
 625          * @param bool|string $notificationtimestamp
 626          * @param bool $latest Whether this row corresponds to the page's latest revision.
 627          * @param bool $firstInList Whether this row corresponds to the first
 628          *   displayed on this history page.
 629          * @return string HTML output for the row
 630          */
 631         function historyLine( $row, $next, $notificationtimestamp = false,
 632                 $latest = false, $firstInList = false ) {
 633                 $rev = new Revision( $row );
 634                 $rev->setTitle( $this->getTitle() );
 635
 636                 if ( is_object( $next ) ) {
 637                         $prevRev = new Revision( $next );
 638                         $prevRev->setTitle( $this->getTitle() );
 639                 } else {
 640                         $prevRev = null;
 641                 }
 642
 643                 $curlink = $this->curLink( $rev, $latest );
 644                 $lastlink = $this->lastLink( $rev, $next );
 645                 $curLastlinks = $curlink . $this->historyPage->message['pipe-separator'] . $lastlink;
 646                 $histLinks = Html::rawElement(
 647                         'span',
 648                         [ 'class' => 'mw-history-histlinks' ],
 649                         $this->msg( 'parentheses' )->rawParams( $curLastlinks )->escaped()
 650                 );
 651
 652                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 653                 $s = $histLinks . $diffButtons;
 654
 655                 $link = $this->revLink( $rev );
 656                 $classes = [];
 657
 658                 $del = '';
 659                 $user = $this->getUser();
 660                 $canRevDelete = $user->isAllowed( 'deleterevision' );
 661                 // Show checkboxes for each revision, to allow for revision deletion and
 662                 // change tags
 663                 if ( $canRevDelete || $this->showTagEditUI ) {
 664                         $this->preventClickjacking();
 665                         // If revision was hidden from sysops and we don't need the checkbox
 666                         // for anything else, disable it
 667                         if ( !$this->showTagEditUI && !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 668                                 $del = Xml::check( 'deleterevisions', false, [ 'disabled' => 'disabled' ] );
 669                         // Otherwise, enable the checkbox...
 670                         } else {
 671                                 $del = Xml::check( 'showhiderevisions', false,
 672                                         [ 'name' => 'ids[' . $rev->getId() . ']' ] );
 673                         }
 674                 // User can only view deleted revisions...
 675                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 676                         // If revision was hidden from sysops, disable the link
 677                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 678                                 $del = Linker::revDeleteLinkDisabled( false );
 679                         // Otherwise, show the link...
 680                         } else {
 681                                 $query = [ 'type' => 'revision',
 682                                         'target' => $this->getTitle()->getPrefixedDBkey(), 'ids' => $rev->getId() ];
 683                                 $del .= Linker::revDeleteLink( $query,
 684                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 685                         }
 686                 }
 687                 if ( $del ) {
 688                         $s .= " $del ";
 689                 }
 690
 691                 $lang = $this->getLanguage();
 692                 $dirmark = $lang->getDirMark();
 693
 694                 $s .= " $link";
 695                 $s .= $dirmark;
 696                 $s .= " <span class='history-user'>" .
 697                         Linker::revUserTools( $rev, true ) . "</span>";
 698                 $s .= $dirmark;
 699
 700                 if ( $rev->isMinor() ) {
 701                         $s .= ' ' . ChangesList::flag( 'minor', $this->getContext() );
 702                 }
 703
 704                 # Sometimes rev_len isn't populated
 705                 if ( $rev->getSize() !== null ) {
 706                         # Size is always public data
 707                         $prevSize = isset( $this->parentLens[$row->rev_parent_id] )
 708                                 ? $this->parentLens[$row->rev_parent_id]
 709                                 : 0;
 710                         $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 711                         $fSize = Linker::formatRevisionSize( $rev->getSize() );
 712                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . "$fSize $sDiff";
 713                 }
 714
 715                 # Text following the character difference is added just before running hooks
 716                 $s2 = Linker::revComment( $rev, false, true );
 717
 718                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 719                         $s2 .= ' <span class="updatedmarker">' . $this->msg( 'updatedmarker' )->escaped() . '</span>';
 720                         $classes[] = 'mw-history-line-updated';
 721                 }
 722
 723                 $tools = [];
 724
 725                 # Rollback and undo links
 726                 if ( $prevRev && $this->getTitle()->quickUserCan( 'edit', $user ) ) {
 727                         if ( $latest && $this->getTitle()->quickUserCan( 'rollback', $user ) ) {
 728                                 // Get a rollback link without the brackets
 729                                 $rollbackLink = Linker::generateRollback(
 730                                         $rev,
 731                                         $this->getContext(),
 732                                         [ 'verify', 'noBrackets' ]
 733                                 );
 734                                 if ( $rollbackLink ) {
 735                                         $this->preventClickjacking();
 736                                         $tools[] = $rollbackLink;
 737                                 }
 738                         }
 739
 740                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 741                                 && !$prevRev->isDeleted( Revision::DELETED_TEXT )
 742                         ) {
 743                                 # Create undo tooltip for the first (=latest) line only
 744                                 $undoTooltip = $latest
 745                                         ? [ 'title' => $this->msg( 'tooltip-undo' )->text() ]
 746                                         : [];
 747                                 $undolink = MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 748                                         $this->getTitle(),
 749                                         $this->msg( 'editundo' )->text(),
 750                                         $undoTooltip,
 751                                         [
 752                                                 'action' => 'edit',
 753                                                 'undoafter' => $prevRev->getId(),
 754                                                 'undo' => $rev->getId()
 755                                         ]
 756                                 );
 757                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 758                         }
 759                 }
 760                 // Allow extension to add their own links here
 761                 Hooks::run( 'HistoryRevisionTools', [ $rev, &$tools, $prevRev, $user ] );
 762
 763                 if ( $tools ) {
 764                         $s2 .= ' ' . $this->msg( 'parentheses' )->rawParams( $lang->pipeList( $tools ) )->escaped();
 765                 }
 766
 767                 # Tags
 768                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow(
 769                         $row->ts_tags,
 770                         'history',
 771                         $this->getContext()
 772                 );
 773                 $classes = array_merge( $classes, $newClasses );
 774                 if ( $tagSummary !== '' ) {
 775                         $s2 .= " $tagSummary";
 776                 }
 777
 778                 # Include separator between character difference and following text
 779                 if ( $s2 !== '' ) {
 780                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . $s2;
 781                 }
 782
 783                 $attribs = [ 'data-mw-revid' => $rev->getId() ];
 784
 785                 Hooks::run( 'PageHistoryLineEnding', [ $this, &$row, &$s, &$classes, &$attribs ] );
 786                 $attribs = wfArrayFilterByKey( $attribs, [ Sanitizer::class, 'isReservedDataAttribute' ] );
 787
 788                 if ( $classes ) {
 789                         $attribs['class'] = implode( ' ', $classes );
 790                 }
 791
 792                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 793         }
 794
 795         /**
 796          * Create a link to view this revision of the page
 797          *
 798          * @param Revision $rev
 799          * @return string
 800          */
 801         function revLink( $rev ) {
 802                 $date = $this->getLanguage()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 803                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 804                         $link = MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 805                                 $this->getTitle(),
 806                                 $date,
 807                                 [ 'class' => 'mw-changeslist-date' ],
 808                                 [ 'oldid' => $rev->getId() ]
 809                         );
 810                 } else {
 811                         $link = htmlspecialchars( $date );
 812                 }
 813                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 814                         $link = "<span class=\"history-deleted\">$link</span>";
 815                 }
 816
 817                 return $link;
 818         }
 819
 820         /**
 821          * Create a diff-to-current link for this revision for this page
 822          *
 823          * @param Revision $rev
 824          * @param bool $latest This is the latest revision of the page?
 825          * @return string
 826          */
 827         function curLink( $rev, $latest ) {
 828                 $cur = $this->historyPage->message['cur'];
 829                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 830                         return $cur;
 831                 } else {
 832                         return MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 833                                 $this->getTitle(),
 834                                 $cur,
 835                                 [],
 836                                 [
 837                                         'diff' => $this->getWikiPage()->getLatest(),
 838                                         'oldid' => $rev->getId()
 839                                 ]
 840                         );
 841                 }
 842         }
 843
 844         /**
 845          * Create a diff-to-previous link for this revision for this page.
 846          *
 847          * @param Revision $prevRev The revision being displayed
 848          * @param stdClass|string|null $next The next revision in list (that is
 849          *        the previous one in chronological order).
 850          *        May either be a row, "unknown" or null.
 851          * @return string
 852          */
 853         function lastLink( $prevRev, $next ) {
 854                 $last = $this->historyPage->message['last'];
 855
 856                 if ( $next === null ) {
 857                         # Probably no next row
 858                         return $last;
 859                 }
 860
 861                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
 862                 if ( $next === 'unknown' ) {
 863                         # Next row probably exists but is unknown, use an oldid=prev link
 864                         return $linkRenderer->makeKnownLink(
 865                                 $this->getTitle(),
 866                                 $last,
 867                                 [],
 868                                 [
 869                                         'diff' => $prevRev->getId(),
 870                                         'oldid' => 'prev'
 871                                 ]
 872                         );
 873                 }
 874
 875                 $nextRev = new Revision( $next );
 876
 877                 if ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 878                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 879                 ) {
 880                         return $last;
 881                 }
 882
 883                 return $linkRenderer->makeKnownLink(
 884                         $this->getTitle(),
 885                         $last,
 886                         [],
 887                         [
 888                                 'diff' => $prevRev->getId(),
 889                                 'oldid' => $next->rev_id
 890                         ]
 891                 );
 892         }
 893
 894         /**
 895          * Create radio buttons for page history
 896          *
 897          * @param Revision $rev
 898          * @param bool $firstInList Is this version the first one?
 899          *
 900          * @return string HTML output for the radio buttons
 901          */
 902         function diffButtons( $rev, $firstInList ) {
 903                 if ( $this->getNumRows() > 1 ) {
 904                         $id = $rev->getId();
 905                         $radio = [ 'type' => 'radio', 'value' => $id ];
 906                         /** @todo Move title texts to javascript */
 907                         if ( $firstInList ) {
 908                                 $first = Xml::element( 'input',
 909                                         array_merge( $radio, [
 910                                                 'style' => 'visibility:hidden',
 911                                                 'name' => 'oldid',
 912                                                 'id' => 'mw-oldid-null' ] )
 913                                 );
 914                                 $checkmark = [ 'checked' => 'checked' ];
 915                         } else {
 916                                 # Check visibility of old revisions
 917                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 918                                         $radio['disabled'] = 'disabled';
 919                                         $checkmark = []; // We will check the next possible one
 920                                 } elseif ( !$this->oldIdChecked ) {
 921                                         $checkmark = [ 'checked' => 'checked' ];
 922                                         $this->oldIdChecked = $id;
 923                                 } else {
 924                                         $checkmark = [];
 925                                 }
 926                                 $first = Xml::element( 'input',
 927                                         array_merge( $radio, $checkmark, [
 928                                                 'name' => 'oldid',
 929                                                 'id' => "mw-oldid-$id" ] ) );
 930                                 $checkmark = [];
 931                         }
 932                         $second = Xml::element( 'input',
 933                                 array_merge( $radio, $checkmark, [
 934                                         'name' => 'diff',
 935                                         'id' => "mw-diff-$id" ] ) );
 936
 937                         return $first . $second;
 938                 } else {
 939                         return '';
 940                 }
 941         }
 942
 943         /**
 944          * This is called if a write operation is possible from the generated HTML
 945          * @param bool $enable
 946          */
 947         function preventClickjacking( $enable = true ) {
 948                 $this->preventClickjacking = $enable;
 949         }
 950
 951         /**
 952          * Get the "prevent clickjacking" flag
 953          * @return bool
 954          */
 955         function getPreventClickjacking() {
 956                 return $this->preventClickjacking;
 957         }
 958
 959 }