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                 $content = Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 196                 $content .= Html::hidden( 'action', 'history' ) . "\n";
 197                 $content .= Xml::dateMenu(
 198                         ( $year == null ? MWTimestamp::getLocalInstance()->format( 'Y' ) : $year ),
 199                         $month
 200                 ) . '&#160;';
 201                 $content .= $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '';
 202                 $content .= $checkDeleted . Html::submitButton(
 203                         $this->msg( 'historyaction-submit' )->text(),
 204                         [],
 205                         [ 'mw-ui-progressive' ]
 206                 );
 207                 $out->addHTML(
 208                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 209                         Xml::fieldset(
 210                                 $this->msg( 'history-fieldset-title' )->text(),
 211                                 $content,
 212                                 [ 'id' => 'mw-history-search' ]
 213                         ) .
 214                         '</form>'
 215                 );
 216
 217                 Hooks::run( 'PageHistoryBeforeList', [ &$this->page, $this->getContext() ] );
 218
 219                 // Create and output the list.
 220                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 221                 $out->addHTML(
 222                         $pager->getNavigationBar() .
 223                         $pager->getBody() .
 224                         $pager->getNavigationBar()
 225                 );
 226                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 227         }
 228
 229         /**
 230          * Fetch an array of revisions, specified by a given limit, offset and
 231          * direction. This is now only used by the feeds. It was previously
 232          * used by the main UI but that's now handled by the pager.
 233          *
 234          * @param int $limit The limit number of revisions to get
 235          * @param int $offset
 236          * @param int $direction Either self::DIR_PREV or self::DIR_NEXT
 237          * @return ResultWrapper
 238          */
 239         function fetchRevisions( $limit, $offset, $direction ) {
 240                 // Fail if article doesn't exist.
 241                 if ( !$this->getTitle()->exists() ) {
 242                         return new FakeResultWrapper( [] );
 243                 }
 244
 245                 $dbr = wfGetDB( DB_REPLICA );
 246
 247                 if ( $direction === self::DIR_PREV ) {
 248                         list( $dirs, $oper ) = [ "ASC", ">=" ];
 249                 } else { /* $direction === self::DIR_NEXT */
 250                         list( $dirs, $oper ) = [ "DESC", "<=" ];
 251                 }
 252
 253                 if ( $offset ) {
 254                         $offsets = [ "rev_timestamp $oper " . $dbr->addQuotes( $dbr->timestamp( $offset ) ) ];
 255                 } else {
 256                         $offsets = [];
 257                 }
 258
 259                 $page_id = $this->page->getId();
 260
 261                 return $dbr->select( 'revision',
 262                         Revision::selectFields(),
 263                         array_merge( [ 'rev_page' => $page_id ], $offsets ),
 264                         __METHOD__,
 265                         [ 'ORDER BY' => "rev_timestamp $dirs",
 266                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit ]
 267                 );
 268         }
 269
 270         /**
 271          * Output a subscription feed listing recent edits to this page.
 272          *
 273          * @param string $type Feed type
 274          */
 275         function feed( $type ) {
 276                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 277                         return;
 278                 }
 279                 $request = $this->getRequest();
 280
 281                 $feedClasses = $this->context->getConfig()->get( 'FeedClasses' );
 282                 /** @var RSSFeed|AtomFeed $feed */
 283                 $feed = new $feedClasses[$type](
 284                         $this->getTitle()->getPrefixedText() . ' - ' .
 285                         $this->msg( 'history-feed-title' )->inContentLanguage()->text(),
 286                         $this->msg( 'history-feed-description' )->inContentLanguage()->text(),
 287                         $this->getTitle()->getFullURL( 'action=history' )
 288                 );
 289
 290                 // Get a limit on number of feed entries. Provide a sane default
 291                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 292                 $limit = $request->getInt( 'limit', 10 );
 293                 $limit = min(
 294                         max( $limit, 1 ),
 295                         $this->context->getConfig()->get( 'FeedLimit' )
 296                 );
 297
 298                 $items = $this->fetchRevisions( $limit, 0, self::DIR_NEXT );
 299
 300                 // Generate feed elements enclosed between header and footer.
 301                 $feed->outHeader();
 302                 if ( $items->numRows() ) {
 303                         foreach ( $items as $row ) {
 304                                 $feed->outItem( $this->feedItem( $row ) );
 305                         }
 306                 } else {
 307                         $feed->outItem( $this->feedEmpty() );
 308                 }
 309                 $feed->outFooter();
 310         }
 311
 312         function feedEmpty() {
 313                 return new FeedItem(
 314                         $this->msg( 'nohistory' )->inContentLanguage()->text(),
 315                         $this->msg( 'history-feed-empty' )->inContentLanguage()->parseAsBlock(),
 316                         $this->getTitle()->getFullURL(),
 317                         wfTimestamp( TS_MW ),
 318                         '',
 319                         $this->getTitle()->getTalkPage()->getFullURL()
 320                 );
 321         }
 322
 323         /**
 324          * Generate a FeedItem object from a given revision table row
 325          * Borrows Recent Changes' feed generation functions for formatting;
 326          * includes a diff to the previous revision (if any).
 327          *
 328          * @param stdClass|array $row Database row
 329          * @return FeedItem
 330          */
 331         function feedItem( $row ) {
 332                 $rev = new Revision( $row );
 333                 $rev->setTitle( $this->getTitle() );
 334                 $text = FeedUtils::formatDiffRow(
 335                         $this->getTitle(),
 336                         $this->getTitle()->getPreviousRevisionID( $rev->getId() ),
 337                         $rev->getId(),
 338                         $rev->getTimestamp(),
 339                         $rev->getComment()
 340                 );
 341                 if ( $rev->getComment() == '' ) {
 342                         global $wgContLang;
 343                         $title = $this->msg( 'history-feed-item-nocomment',
 344                                 $rev->getUserText(),
 345                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 346                                 $wgContLang->date( $rev->getTimestamp() ),
 347                                 $wgContLang->time( $rev->getTimestamp() ) )->inContentLanguage()->text();
 348                 } else {
 349                         $title = $rev->getUserText() .
 350                                 $this->msg( 'colon-separator' )->inContentLanguage()->text() .
 351                                 FeedItem::stripComment( $rev->getComment() );
 352                 }
 353
 354                 return new FeedItem(
 355                         $title,
 356                         $text,
 357                         $this->getTitle()->getFullURL( 'diff=' . $rev->getId() . '&oldid=prev' ),
 358                         $rev->getTimestamp(),
 359                         $rev->getUserText(),
 360                         $this->getTitle()->getTalkPage()->getFullURL()
 361                 );
 362         }
 363 }
 364
 365 /**
 366  * @ingroup Pager
 367  * @ingroup Actions
 368  */
 369 class HistoryPager extends ReverseChronologicalPager {
 370         /**
 371          * @var bool|stdClass
 372          */
 373         public $lastRow = false;
 374
 375         public $counter, $historyPage, $buttons, $conds;
 376
 377         protected $oldIdChecked;
 378
 379         protected $preventClickjacking = false;
 380         /**
 381          * @var array
 382          */
 383         protected $parentLens;
 384
 385         /** @var bool Whether to show the tag editing UI */
 386         protected $showTagEditUI;
 387
 388         /**
 389          * @param HistoryAction $historyPage
 390          * @param string $year
 391          * @param string $month
 392          * @param string $tagFilter
 393          * @param array $conds
 394          */
 395         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = [] ) {
 396                 parent::__construct( $historyPage->getContext() );
 397                 $this->historyPage = $historyPage;
 398                 $this->tagFilter = $tagFilter;
 399                 $this->getDateCond( $year, $month );
 400                 $this->conds = $conds;
 401                 $this->showTagEditUI = ChangeTags::showTagEditingUI( $this->getUser() );
 402         }
 403
 404         // For hook compatibility...
 405         function getArticle() {
 406                 return $this->historyPage->getArticle();
 407         }
 408
 409         function getSqlComment() {
 410                 if ( $this->conds ) {
 411                         return 'history page filtered'; // potentially slow, see CR r58153
 412                 } else {
 413                         return 'history page unfiltered';
 414                 }
 415         }
 416
 417         function getQueryInfo() {
 418                 $queryInfo = [
 419                         'tables' => [ 'revision', 'user' ],
 420                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 421                         'conds' => array_merge(
 422                                 [ 'rev_page' => $this->getWikiPage()->getId() ],
 423                                 $this->conds ),
 424                         'options' => [ 'USE INDEX' => [ 'revision' => 'page_timestamp' ] ],
 425                         'join_conds' => [ 'user' => Revision::userJoinCond() ],
 426                 ];
 427                 ChangeTags::modifyDisplayQuery(
 428                         $queryInfo['tables'],
 429                         $queryInfo['fields'],
 430                         $queryInfo['conds'],
 431                         $queryInfo['join_conds'],
 432                         $queryInfo['options'],
 433                         $this->tagFilter
 434                 );
 435
 436                 // Avoid PHP 7.1 warning of passing $this by reference
 437                 $historyPager = $this;
 438                 Hooks::run( 'PageHistoryPager::getQueryInfo', [ &$historyPager, &$queryInfo ] );
 439
 440                 return $queryInfo;
 441         }
 442
 443         function getIndexField() {
 444                 return 'rev_timestamp';
 445         }
 446
 447         /**
 448          * @param stdClass $row
 449          * @return string
 450          */
 451         function formatRow( $row ) {
 452                 if ( $this->lastRow ) {
 453                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 454                         $firstInList = $this->counter == 1;
 455                         $this->counter++;
 456
 457                         $notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 458                                 ? $this->getTitle()->getNotificationTimestamp( $this->getUser() )
 459                                 : false;
 460
 461                         $s = $this->historyLine(
 462                                 $this->lastRow, $row, $notifTimestamp, $latest, $firstInList );
 463                 } else {
 464                         $s = '';
 465                 }
 466                 $this->lastRow = $row;
 467
 468                 return $s;
 469         }
 470
 471         function doBatchLookups() {
 472                 if ( !Hooks::run( 'PageHistoryPager::doBatchLookups', [ $this, $this->mResult ] ) ) {
 473                         return;
 474                 }
 475
 476                 # Do a link batch query
 477                 $this->mResult->seek( 0 );
 478                 $batch = new LinkBatch();
 479                 $revIds = [];
 480                 foreach ( $this->mResult as $row ) {
 481                         if ( $row->rev_parent_id ) {
 482                                 $revIds[] = $row->rev_parent_id;
 483                         }
 484                         if ( !is_null( $row->user_name ) ) {
 485                                 $batch->add( NS_USER, $row->user_name );
 486                                 $batch->add( NS_USER_TALK, $row->user_name );
 487                         } else { # for anons or usernames of imported revisions
 488                                 $batch->add( NS_USER, $row->rev_user_text );
 489                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 490                         }
 491                 }
 492                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 493                 $batch->execute();
 494                 $this->mResult->seek( 0 );
 495         }
 496
 497         /**
 498          * Creates begin of history list with a submit button
 499          *
 500          * @return string HTML output
 501          */
 502         function getStartBody() {
 503                 $this->lastRow = false;
 504                 $this->counter = 1;
 505                 $this->oldIdChecked = 0;
 506
 507                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 508                 $s = Html::openElement( 'form', [ 'action' => wfScript(),
 509                         'id' => 'mw-history-compare' ] ) . "\n";
 510                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 511                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 512                 $s .= Html::hidden( 'type', 'revision' ) . "\n";
 513
 514                 // Button container stored in $this->buttons for re-use in getEndBody()
 515                 $this->buttons = '<div>';
 516                 $className = 'historysubmit mw-history-compareselectedversions-button';
 517                 $attrs = [ 'class' => $className ]
 518                         + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' );
 519                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 520                         $attrs
 521                 ) . "\n";
 522
 523                 $user = $this->getUser();
 524                 $actionButtons = '';
 525                 if ( $user->isAllowed( 'deleterevision' ) ) {
 526                         $actionButtons .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 527                 }
 528                 if ( $this->showTagEditUI ) {
 529                         $actionButtons .= $this->getRevisionButton( 'editchangetags', 'history-edit-tags' );
 530                 }
 531                 if ( $actionButtons ) {
 532                         $this->buttons .= Xml::tags( 'div', [ 'class' =>
 533                                 'mw-history-revisionactions' ], $actionButtons );
 534                 }
 535
 536                 if ( $user->isAllowed( 'deleterevision' ) || $this->showTagEditUI ) {
 537                         $this->buttons .= ( new ListToggle( $this->getOutput() ) )->getHTML();
 538                 }
 539
 540                 $this->buttons .= '</div>';
 541
 542                 $s .= $this->buttons;
 543                 $s .= '<ul id="pagehistory">' . "\n";
 544
 545                 return $s;
 546         }
 547
 548         private function getRevisionButton( $name, $msg ) {
 549                 $this->preventClickjacking();
 550                 # Note bug #20966, <button> is non-standard in IE<8
 551                 $element = Html::element(
 552                         'button',
 553                         [
 554                                 'type' => 'submit',
 555                                 'name' => $name,
 556                                 'value' => '1',
 557                                 'class' => "historysubmit mw-history-$name-button",
 558                         ],
 559                         $this->msg( $msg )->text()
 560                 ) . "\n";
 561                 return $element;
 562         }
 563
 564         function getEndBody() {
 565                 if ( $this->lastRow ) {
 566                         $latest = $this->counter == 1 && $this->mIsFirst;
 567                         $firstInList = $this->counter == 1;
 568                         if ( $this->mIsBackwards ) {
 569                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 570                                 if ( $this->mOffset == '' ) {
 571                                         $next = null;
 572                                 } else {
 573                                         $next = 'unknown';
 574                                 }
 575                         } else {
 576                                 # The next row is the past-the-end row
 577                                 $next = $this->mPastTheEndRow;
 578                         }
 579                         $this->counter++;
 580
 581                         $notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 582                                 ? $this->getTitle()->getNotificationTimestamp( $this->getUser() )
 583                                 : false;
 584
 585                         $s = $this->historyLine(
 586                                 $this->lastRow, $next, $notifTimestamp, $latest, $firstInList );
 587                 } else {
 588                         $s = '';
 589                 }
 590                 $s .= "</ul>\n";
 591                 # Add second buttons only if there is more than one rev
 592                 if ( $this->getNumRows() > 2 ) {
 593                         $s .= $this->buttons;
 594                 }
 595                 $s .= '</form>';
 596
 597                 return $s;
 598         }
 599
 600         /**
 601          * Creates a submit button
 602          *
 603          * @param string $message Text of the submit button, will be escaped
 604          * @param array $attributes Attributes
 605          * @return string HTML output for the submit button
 606          */
 607         function submitButton( $message, $attributes = [] ) {
 608                 # Disable submit button if history has 1 revision only
 609                 if ( $this->getNumRows() > 1 ) {
 610                         return Html::submitButton( $message, $attributes );
 611                 } else {
 612                         return '';
 613                 }
 614         }
 615
 616         /**
 617          * Returns a row from the history printout.
 618          *
 619          * @todo document some more, and maybe clean up the code (some params redundant?)
 620          *
 621          * @param stdClass $row The database row corresponding to the previous line.
 622          * @param mixed $next The database row corresponding to the next line
 623          *   (chronologically previous)
 624          * @param bool|string $notificationtimestamp
 625          * @param bool $latest Whether this row corresponds to the page's latest revision.
 626          * @param bool $firstInList Whether this row corresponds to the first
 627          *   displayed on this history page.
 628          * @return string HTML output for the row
 629          */
 630         function historyLine( $row, $next, $notificationtimestamp = false,
 631                 $latest = false, $firstInList = false ) {
 632                 $rev = new Revision( $row );
 633                 $rev->setTitle( $this->getTitle() );
 634
 635                 if ( is_object( $next ) ) {
 636                         $prevRev = new Revision( $next );
 637                         $prevRev->setTitle( $this->getTitle() );
 638                 } else {
 639                         $prevRev = null;
 640                 }
 641
 642                 $curlink = $this->curLink( $rev, $latest );
 643                 $lastlink = $this->lastLink( $rev, $next );
 644                 $curLastlinks = $curlink . $this->historyPage->message['pipe-separator'] . $lastlink;
 645                 $histLinks = Html::rawElement(
 646                         'span',
 647                         [ 'class' => 'mw-history-histlinks' ],
 648                         $this->msg( 'parentheses' )->rawParams( $curLastlinks )->escaped()
 649                 );
 650
 651                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 652                 $s = $histLinks . $diffButtons;
 653
 654                 $link = $this->revLink( $rev );
 655                 $classes = [];
 656
 657                 $del = '';
 658                 $user = $this->getUser();
 659                 $canRevDelete = $user->isAllowed( 'deleterevision' );
 660                 // Show checkboxes for each revision, to allow for revision deletion and
 661                 // change tags
 662                 if ( $canRevDelete || $this->showTagEditUI ) {
 663                         $this->preventClickjacking();
 664                         // If revision was hidden from sysops and we don't need the checkbox
 665                         // for anything else, disable it
 666                         if ( !$this->showTagEditUI && !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 667                                 $del = Xml::check( 'deleterevisions', false, [ 'disabled' => 'disabled' ] );
 668                         // Otherwise, enable the checkbox...
 669                         } else {
 670                                 $del = Xml::check( 'showhiderevisions', false,
 671                                         [ 'name' => 'ids[' . $rev->getId() . ']' ] );
 672                         }
 673                 // User can only view deleted revisions...
 674                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 675                         // If revision was hidden from sysops, disable the link
 676                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 677                                 $del = Linker::revDeleteLinkDisabled( false );
 678                         // Otherwise, show the link...
 679                         } else {
 680                                 $query = [ 'type' => 'revision',
 681                                         'target' => $this->getTitle()->getPrefixedDBkey(), 'ids' => $rev->getId() ];
 682                                 $del .= Linker::revDeleteLink( $query,
 683                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 684                         }
 685                 }
 686                 if ( $del ) {
 687                         $s .= " $del ";
 688                 }
 689
 690                 $lang = $this->getLanguage();
 691                 $dirmark = $lang->getDirMark();
 692
 693                 $s .= " $link";
 694                 $s .= $dirmark;
 695                 $s .= " <span class='history-user'>" .
 696                         Linker::revUserTools( $rev, true ) . "</span>";
 697                 $s .= $dirmark;
 698
 699                 if ( $rev->isMinor() ) {
 700                         $s .= ' ' . ChangesList::flag( 'minor', $this->getContext() );
 701                 }
 702
 703                 # Sometimes rev_len isn't populated
 704                 if ( $rev->getSize() !== null ) {
 705                         # Size is always public data
 706                         $prevSize = isset( $this->parentLens[$row->rev_parent_id] )
 707                                 ? $this->parentLens[$row->rev_parent_id]
 708                                 : 0;
 709                         $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 710                         $fSize = Linker::formatRevisionSize( $rev->getSize() );
 711                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . "$fSize $sDiff";
 712                 }
 713
 714                 # Text following the character difference is added just before running hooks
 715                 $s2 = Linker::revComment( $rev, false, true );
 716
 717                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 718                         $s2 .= ' <span class="updatedmarker">' . $this->msg( 'updatedmarker' )->escaped() . '</span>';
 719                         $classes[] = 'mw-history-line-updated';
 720                 }
 721
 722                 $tools = [];
 723
 724                 # Rollback and undo links
 725                 if ( $prevRev && $this->getTitle()->quickUserCan( 'edit', $user ) ) {
 726                         if ( $latest && $this->getTitle()->quickUserCan( 'rollback', $user ) ) {
 727                                 // Get a rollback link without the brackets
 728                                 $rollbackLink = Linker::generateRollback(
 729                                         $rev,
 730                                         $this->getContext(),
 731                                         [ 'verify', 'noBrackets' ]
 732                                 );
 733                                 if ( $rollbackLink ) {
 734                                         $this->preventClickjacking();
 735                                         $tools[] = $rollbackLink;
 736                                 }
 737                         }
 738
 739                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 740                                 && !$prevRev->isDeleted( Revision::DELETED_TEXT )
 741                         ) {
 742                                 # Create undo tooltip for the first (=latest) line only
 743                                 $undoTooltip = $latest
 744                                         ? [ 'title' => $this->msg( 'tooltip-undo' )->text() ]
 745                                         : [];
 746                                 $undolink = MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 747                                         $this->getTitle(),
 748                                         $this->msg( 'editundo' )->text(),
 749                                         $undoTooltip,
 750                                         [
 751                                                 'action' => 'edit',
 752                                                 'undoafter' => $prevRev->getId(),
 753                                                 'undo' => $rev->getId()
 754                                         ]
 755                                 );
 756                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 757                         }
 758                 }
 759                 // Allow extension to add their own links here
 760                 Hooks::run( 'HistoryRevisionTools', [ $rev, &$tools, $prevRev, $user ] );
 761
 762                 if ( $tools ) {
 763                         $s2 .= ' ' . $this->msg( 'parentheses' )->rawParams( $lang->pipeList( $tools ) )->escaped();
 764                 }
 765
 766                 # Tags
 767                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow(
 768                         $row->ts_tags,
 769                         'history',
 770                         $this->getContext()
 771                 );
 772                 $classes = array_merge( $classes, $newClasses );
 773                 if ( $tagSummary !== '' ) {
 774                         $s2 .= " $tagSummary";
 775                 }
 776
 777                 # Include separator between character difference and following text
 778                 if ( $s2 !== '' ) {
 779                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . $s2;
 780                 }
 781
 782                 $attribs = [ 'data-mw-revid' => $rev->getId() ];
 783
 784                 Hooks::run( 'PageHistoryLineEnding', [ $this, &$row, &$s, &$classes, &$attribs ] );
 785                 $attribs = wfArrayFilterByKey( $attribs, [ Sanitizer::class, 'isReservedDataAttribute' ] );
 786
 787                 if ( $classes ) {
 788                         $attribs['class'] = implode( ' ', $classes );
 789                 }
 790
 791                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 792         }
 793
 794         /**
 795          * Create a link to view this revision of the page
 796          *
 797          * @param Revision $rev
 798          * @return string
 799          */
 800         function revLink( $rev ) {
 801                 $date = $this->getLanguage()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 802                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 803                         $link = MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 804                                 $this->getTitle(),
 805                                 $date,
 806                                 [ 'class' => 'mw-changeslist-date' ],
 807                                 [ 'oldid' => $rev->getId() ]
 808                         );
 809                 } else {
 810                         $link = htmlspecialchars( $date );
 811                 }
 812                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 813                         $link = "<span class=\"history-deleted\">$link</span>";
 814                 }
 815
 816                 return $link;
 817         }
 818
 819         /**
 820          * Create a diff-to-current link for this revision for this page
 821          *
 822          * @param Revision $rev
 823          * @param bool $latest This is the latest revision of the page?
 824          * @return string
 825          */
 826         function curLink( $rev, $latest ) {
 827                 $cur = $this->historyPage->message['cur'];
 828                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 829                         return $cur;
 830                 } else {
 831                         return MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 832                                 $this->getTitle(),
 833                                 $cur,
 834                                 [],
 835                                 [
 836                                         'diff' => $this->getWikiPage()->getLatest(),
 837                                         'oldid' => $rev->getId()
 838                                 ]
 839                         );
 840                 }
 841         }
 842
 843         /**
 844          * Create a diff-to-previous link for this revision for this page.
 845          *
 846          * @param Revision $prevRev The revision being displayed
 847          * @param stdClass|string|null $next The next revision in list (that is
 848          *        the previous one in chronological order).
 849          *        May either be a row, "unknown" or null.
 850          * @return string
 851          */
 852         function lastLink( $prevRev, $next ) {
 853                 $last = $this->historyPage->message['last'];
 854
 855                 if ( $next === null ) {
 856                         # Probably no next row
 857                         return $last;
 858                 }
 859
 860                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
 861                 if ( $next === 'unknown' ) {
 862                         # Next row probably exists but is unknown, use an oldid=prev link
 863                         return $linkRenderer->makeKnownLink(
 864                                 $this->getTitle(),
 865                                 $last,
 866                                 [],
 867                                 [
 868                                         'diff' => $prevRev->getId(),
 869                                         'oldid' => 'prev'
 870                                 ]
 871                         );
 872                 }
 873
 874                 $nextRev = new Revision( $next );
 875
 876                 if ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 877                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 878                 ) {
 879                         return $last;
 880                 }
 881
 882                 return $linkRenderer->makeKnownLink(
 883                         $this->getTitle(),
 884                         $last,
 885                         [],
 886                         [
 887                                 'diff' => $prevRev->getId(),
 888                                 'oldid' => $next->rev_id
 889                         ]
 890                 );
 891         }
 892
 893         /**
 894          * Create radio buttons for page history
 895          *
 896          * @param Revision $rev
 897          * @param bool $firstInList Is this version the first one?
 898          *
 899          * @return string HTML output for the radio buttons
 900          */
 901         function diffButtons( $rev, $firstInList ) {
 902                 if ( $this->getNumRows() > 1 ) {
 903                         $id = $rev->getId();
 904                         $radio = [ 'type' => 'radio', 'value' => $id ];
 905                         /** @todo Move title texts to javascript */
 906                         if ( $firstInList ) {
 907                                 $first = Xml::element( 'input',
 908                                         array_merge( $radio, [
 909                                                 'style' => 'visibility:hidden',
 910                                                 'name' => 'oldid',
 911                                                 'id' => 'mw-oldid-null' ] )
 912                                 );
 913                                 $checkmark = [ 'checked' => 'checked' ];
 914                         } else {
 915                                 # Check visibility of old revisions
 916                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 917                                         $radio['disabled'] = 'disabled';
 918                                         $checkmark = []; // We will check the next possible one
 919                                 } elseif ( !$this->oldIdChecked ) {
 920                                         $checkmark = [ 'checked' => 'checked' ];
 921                                         $this->oldIdChecked = $id;
 922                                 } else {
 923                                         $checkmark = [];
 924                                 }
 925                                 $first = Xml::element( 'input',
 926                                         array_merge( $radio, $checkmark, [
 927                                                 'name' => 'oldid',
 928                                                 'id' => "mw-oldid-$id" ] ) );
 929                                 $checkmark = [];
 930                         }
 931                         $second = Xml::element( 'input',
 932                                 array_merge( $radio, $checkmark, [
 933                                         'name' => 'diff',
 934                                         'id' => "mw-diff-$id" ] ) );
 935
 936                         return $first . $second;
 937                 } else {
 938                         return '';
 939                 }
 940         }
 941
 942         /**
 943          * This is called if a write operation is possible from the generated HTML
 944          * @param bool $enable
 945          */
 946         function preventClickjacking( $enable = true ) {
 947                 $this->preventClickjacking = $enable;
 948         }
 949
 950         /**
 951          * Get the "prevent clickjacking" flag
 952          * @return bool
 953          */
 954         function getPreventClickjacking() {
 955                 return $this->preventClickjacking;
 956         }
 957
 958 }