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', 'protect' ],
 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                 $revQuery = Revision::getQueryInfo();
 262                 return $dbr->select(
 263                         $revQuery['tables'],
 264                         $revQuery['fields'],
 265                         array_merge( [ 'rev_page' => $page_id ], $offsets ),
 266                         __METHOD__,
 267                         [
 268                                 'ORDER BY' => "rev_timestamp $dirs",
 269                                 'USE INDEX' => [ 'revision' => 'page_timestamp' ],
 270                                 'LIMIT' => $limit
 271                         ],
 272                         $revQuery['joins']
 273                 );
 274         }
 275
 276         /**
 277          * Output a subscription feed listing recent edits to this page.
 278          *
 279          * @param string $type Feed type
 280          */
 281         function feed( $type ) {
 282                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 283                         return;
 284                 }
 285                 $request = $this->getRequest();
 286
 287                 $feedClasses = $this->context->getConfig()->get( 'FeedClasses' );
 288                 /** @var RSSFeed|AtomFeed $feed */
 289                 $feed = new $feedClasses[$type](
 290                         $this->getTitle()->getPrefixedText() . ' - ' .
 291                         $this->msg( 'history-feed-title' )->inContentLanguage()->text(),
 292                         $this->msg( 'history-feed-description' )->inContentLanguage()->text(),
 293                         $this->getTitle()->getFullURL( 'action=history' )
 294                 );
 295
 296                 // Get a limit on number of feed entries. Provide a sane default
 297                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 298                 $limit = $request->getInt( 'limit', 10 );
 299                 $limit = min(
 300                         max( $limit, 1 ),
 301                         $this->context->getConfig()->get( 'FeedLimit' )
 302                 );
 303
 304                 $items = $this->fetchRevisions( $limit, 0, self::DIR_NEXT );
 305
 306                 // Generate feed elements enclosed between header and footer.
 307                 $feed->outHeader();
 308                 if ( $items->numRows() ) {
 309                         foreach ( $items as $row ) {
 310                                 $feed->outItem( $this->feedItem( $row ) );
 311                         }
 312                 } else {
 313                         $feed->outItem( $this->feedEmpty() );
 314                 }
 315                 $feed->outFooter();
 316         }
 317
 318         function feedEmpty() {
 319                 return new FeedItem(
 320                         $this->msg( 'nohistory' )->inContentLanguage()->text(),
 321                         $this->msg( 'history-feed-empty' )->inContentLanguage()->parseAsBlock(),
 322                         $this->getTitle()->getFullURL(),
 323                         wfTimestamp( TS_MW ),
 324                         '',
 325                         $this->getTitle()->getTalkPage()->getFullURL()
 326                 );
 327         }
 328
 329         /**
 330          * Generate a FeedItem object from a given revision table row
 331          * Borrows Recent Changes' feed generation functions for formatting;
 332          * includes a diff to the previous revision (if any).
 333          *
 334          * @param stdClass|array $row Database row
 335          * @return FeedItem
 336          */
 337         function feedItem( $row ) {
 338                 $rev = new Revision( $row );
 339                 $rev->setTitle( $this->getTitle() );
 340                 $text = FeedUtils::formatDiffRow(
 341                         $this->getTitle(),
 342                         $this->getTitle()->getPreviousRevisionID( $rev->getId() ),
 343                         $rev->getId(),
 344                         $rev->getTimestamp(),
 345                         $rev->getComment()
 346                 );
 347                 if ( $rev->getComment() == '' ) {
 348                         global $wgContLang;
 349                         $title = $this->msg( 'history-feed-item-nocomment',
 350                                 $rev->getUserText(),
 351                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 352                                 $wgContLang->date( $rev->getTimestamp() ),
 353                                 $wgContLang->time( $rev->getTimestamp() ) )->inContentLanguage()->text();
 354                 } else {
 355                         $title = $rev->getUserText() .
 356                                 $this->msg( 'colon-separator' )->inContentLanguage()->text() .
 357                                 FeedItem::stripComment( $rev->getComment() );
 358                 }
 359
 360                 return new FeedItem(
 361                         $title,
 362                         $text,
 363                         $this->getTitle()->getFullURL( 'diff=' . $rev->getId() . '&oldid=prev' ),
 364                         $rev->getTimestamp(),
 365                         $rev->getUserText(),
 366                         $this->getTitle()->getTalkPage()->getFullURL()
 367                 );
 368         }
 369 }
 370
 371 /**
 372  * @ingroup Pager
 373  * @ingroup Actions
 374  */
 375 class HistoryPager extends ReverseChronologicalPager {
 376         /**
 377          * @var bool|stdClass
 378          */
 379         public $lastRow = false;
 380
 381         public $counter, $historyPage, $buttons, $conds;
 382
 383         protected $oldIdChecked;
 384
 385         protected $preventClickjacking = false;
 386         /**
 387          * @var array
 388          */
 389         protected $parentLens;
 390
 391         /** @var bool Whether to show the tag editing UI */
 392         protected $showTagEditUI;
 393
 394         /** @var string */
 395         private $tagFilter;
 396
 397         /**
 398          * @param HistoryAction $historyPage
 399          * @param string $year
 400          * @param string $month
 401          * @param string $tagFilter
 402          * @param array $conds
 403          */
 404         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = [] ) {
 405                 parent::__construct( $historyPage->getContext() );
 406                 $this->historyPage = $historyPage;
 407                 $this->tagFilter = $tagFilter;
 408                 $this->getDateCond( $year, $month );
 409                 $this->conds = $conds;
 410                 $this->showTagEditUI = ChangeTags::showTagEditingUI( $this->getUser() );
 411         }
 412
 413         // For hook compatibility...
 414         function getArticle() {
 415                 return $this->historyPage->getArticle();
 416         }
 417
 418         function getSqlComment() {
 419                 if ( $this->conds ) {
 420                         return 'history page filtered'; // potentially slow, see CR r58153
 421                 } else {
 422                         return 'history page unfiltered';
 423                 }
 424         }
 425
 426         function getQueryInfo() {
 427                 $revQuery = Revision::getQueryInfo( [ 'user' ] );
 428                 $queryInfo = [
 429                         'tables' => $revQuery['tables'],
 430                         'fields' => $revQuery['fields'],
 431                         'conds' => array_merge(
 432                                 [ 'rev_page' => $this->getWikiPage()->getId() ],
 433                                 $this->conds ),
 434                         'options' => [ 'USE INDEX' => [ 'revision' => 'page_timestamp' ] ],
 435                         'join_conds' => $revQuery['joins'],
 436                 ];
 437                 ChangeTags::modifyDisplayQuery(
 438                         $queryInfo['tables'],
 439                         $queryInfo['fields'],
 440                         $queryInfo['conds'],
 441                         $queryInfo['join_conds'],
 442                         $queryInfo['options'],
 443                         $this->tagFilter
 444                 );
 445
 446                 // Avoid PHP 7.1 warning of passing $this by reference
 447                 $historyPager = $this;
 448                 Hooks::run( 'PageHistoryPager::getQueryInfo', [ &$historyPager, &$queryInfo ] );
 449
 450                 return $queryInfo;
 451         }
 452
 453         function getIndexField() {
 454                 return 'rev_timestamp';
 455         }
 456
 457         /**
 458          * @param stdClass $row
 459          * @return string
 460          */
 461         function formatRow( $row ) {
 462                 if ( $this->lastRow ) {
 463                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 464                         $firstInList = $this->counter == 1;
 465                         $this->counter++;
 466
 467                         $notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 468                                 ? $this->getTitle()->getNotificationTimestamp( $this->getUser() )
 469                                 : false;
 470
 471                         $s = $this->historyLine(
 472                                 $this->lastRow, $row, $notifTimestamp, $latest, $firstInList );
 473                 } else {
 474                         $s = '';
 475                 }
 476                 $this->lastRow = $row;
 477
 478                 return $s;
 479         }
 480
 481         function doBatchLookups() {
 482                 if ( !Hooks::run( 'PageHistoryPager::doBatchLookups', [ $this, $this->mResult ] ) ) {
 483                         return;
 484                 }
 485
 486                 # Do a link batch query
 487                 $this->mResult->seek( 0 );
 488                 $batch = new LinkBatch();
 489                 $revIds = [];
 490                 foreach ( $this->mResult as $row ) {
 491                         if ( $row->rev_parent_id ) {
 492                                 $revIds[] = $row->rev_parent_id;
 493                         }
 494                         if ( !is_null( $row->user_name ) ) {
 495                                 $batch->add( NS_USER, $row->user_name );
 496                                 $batch->add( NS_USER_TALK, $row->user_name );
 497                         } else { # for anons or usernames of imported revisions
 498                                 $batch->add( NS_USER, $row->rev_user_text );
 499                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 500                         }
 501                 }
 502                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 503                 $batch->execute();
 504                 $this->mResult->seek( 0 );
 505         }
 506
 507         /**
 508          * Creates begin of history list with a submit button
 509          *
 510          * @return string HTML output
 511          */
 512         function getStartBody() {
 513                 $this->lastRow = false;
 514                 $this->counter = 1;
 515                 $this->oldIdChecked = 0;
 516
 517                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 518                 $s = Html::openElement( 'form', [ 'action' => wfScript(),
 519                         'id' => 'mw-history-compare' ] ) . "\n";
 520                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 521                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 522                 $s .= Html::hidden( 'type', 'revision' ) . "\n";
 523
 524                 // Button container stored in $this->buttons for re-use in getEndBody()
 525                 $this->buttons = '<div>';
 526                 $className = 'historysubmit mw-history-compareselectedversions-button';
 527                 $attrs = [ 'class' => $className ]
 528                         + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' );
 529                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 530                         $attrs
 531                 ) . "\n";
 532
 533                 $user = $this->getUser();
 534                 $actionButtons = '';
 535                 if ( $user->isAllowed( 'deleterevision' ) ) {
 536                         $actionButtons .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 537                 }
 538                 if ( $this->showTagEditUI ) {
 539                         $actionButtons .= $this->getRevisionButton( 'editchangetags', 'history-edit-tags' );
 540                 }
 541                 if ( $actionButtons ) {
 542                         $this->buttons .= Xml::tags( 'div', [ 'class' =>
 543                                 'mw-history-revisionactions' ], $actionButtons );
 544                 }
 545
 546                 if ( $user->isAllowed( 'deleterevision' ) || $this->showTagEditUI ) {
 547                         $this->buttons .= ( new ListToggle( $this->getOutput() ) )->getHTML();
 548                 }
 549
 550                 $this->buttons .= '</div>';
 551
 552                 $s .= $this->buttons;
 553                 $s .= '<ul id="pagehistory">' . "\n";
 554
 555                 return $s;
 556         }
 557
 558         private function getRevisionButton( $name, $msg ) {
 559                 $this->preventClickjacking();
 560                 # Note bug #20966, <button> is non-standard in IE<8
 561                 $element = Html::element(
 562                         'button',
 563                         [
 564                                 'type' => 'submit',
 565                                 'name' => $name,
 566                                 'value' => '1',
 567                                 'class' => "historysubmit mw-history-$name-button",
 568                         ],
 569                         $this->msg( $msg )->text()
 570                 ) . "\n";
 571                 return $element;
 572         }
 573
 574         function getEndBody() {
 575                 if ( $this->lastRow ) {
 576                         $latest = $this->counter == 1 && $this->mIsFirst;
 577                         $firstInList = $this->counter == 1;
 578                         if ( $this->mIsBackwards ) {
 579                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 580                                 if ( $this->mOffset == '' ) {
 581                                         $next = null;
 582                                 } else {
 583                                         $next = 'unknown';
 584                                 }
 585                         } else {
 586                                 # The next row is the past-the-end row
 587                                 $next = $this->mPastTheEndRow;
 588                         }
 589                         $this->counter++;
 590
 591                         $notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 592                                 ? $this->getTitle()->getNotificationTimestamp( $this->getUser() )
 593                                 : false;
 594
 595                         $s = $this->historyLine(
 596                                 $this->lastRow, $next, $notifTimestamp, $latest, $firstInList );
 597                 } else {
 598                         $s = '';
 599                 }
 600                 $s .= "</ul>\n";
 601                 # Add second buttons only if there is more than one rev
 602                 if ( $this->getNumRows() > 2 ) {
 603                         $s .= $this->buttons;
 604                 }
 605                 $s .= '</form>';
 606
 607                 return $s;
 608         }
 609
 610         /**
 611          * Creates a submit button
 612          *
 613          * @param string $message Text of the submit button, will be escaped
 614          * @param array $attributes Attributes
 615          * @return string HTML output for the submit button
 616          */
 617         function submitButton( $message, $attributes = [] ) {
 618                 # Disable submit button if history has 1 revision only
 619                 if ( $this->getNumRows() > 1 ) {
 620                         return Html::submitButton( $message, $attributes );
 621                 } else {
 622                         return '';
 623                 }
 624         }
 625
 626         /**
 627          * Returns a row from the history printout.
 628          *
 629          * @todo document some more, and maybe clean up the code (some params redundant?)
 630          *
 631          * @param stdClass $row The database row corresponding to the previous line.
 632          * @param mixed $next The database row corresponding to the next line
 633          *   (chronologically previous)
 634          * @param bool|string $notificationtimestamp
 635          * @param bool $latest Whether this row corresponds to the page's latest revision.
 636          * @param bool $firstInList Whether this row corresponds to the first
 637          *   displayed on this history page.
 638          * @return string HTML output for the row
 639          */
 640         function historyLine( $row, $next, $notificationtimestamp = false,
 641                 $latest = false, $firstInList = false ) {
 642                 $rev = new Revision( $row );
 643                 $rev->setTitle( $this->getTitle() );
 644
 645                 if ( is_object( $next ) ) {
 646                         $prevRev = new Revision( $next );
 647                         $prevRev->setTitle( $this->getTitle() );
 648                 } else {
 649                         $prevRev = null;
 650                 }
 651
 652                 $curlink = $this->curLink( $rev, $latest );
 653                 $lastlink = $this->lastLink( $rev, $next );
 654                 $curLastlinks = $curlink . $this->historyPage->message['pipe-separator'] . $lastlink;
 655                 $histLinks = Html::rawElement(
 656                         'span',
 657                         [ 'class' => 'mw-history-histlinks' ],
 658                         $this->msg( 'parentheses' )->rawParams( $curLastlinks )->escaped()
 659                 );
 660
 661                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 662                 $s = $histLinks . $diffButtons;
 663
 664                 $link = $this->revLink( $rev );
 665                 $classes = [];
 666
 667                 $del = '';
 668                 $user = $this->getUser();
 669                 $canRevDelete = $user->isAllowed( 'deleterevision' );
 670                 // Show checkboxes for each revision, to allow for revision deletion and
 671                 // change tags
 672                 if ( $canRevDelete || $this->showTagEditUI ) {
 673                         $this->preventClickjacking();
 674                         // If revision was hidden from sysops and we don't need the checkbox
 675                         // for anything else, disable it
 676                         if ( !$this->showTagEditUI && !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 677                                 $del = Xml::check( 'deleterevisions', false, [ 'disabled' => 'disabled' ] );
 678                         // Otherwise, enable the checkbox...
 679                         } else {
 680                                 $del = Xml::check( 'showhiderevisions', false,
 681                                         [ 'name' => 'ids[' . $rev->getId() . ']' ] );
 682                         }
 683                 // User can only view deleted revisions...
 684                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 685                         // If revision was hidden from sysops, disable the link
 686                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 687                                 $del = Linker::revDeleteLinkDisabled( false );
 688                         // Otherwise, show the link...
 689                         } else {
 690                                 $query = [ 'type' => 'revision',
 691                                         'target' => $this->getTitle()->getPrefixedDBkey(), 'ids' => $rev->getId() ];
 692                                 $del .= Linker::revDeleteLink( $query,
 693                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 694                         }
 695                 }
 696                 if ( $del ) {
 697                         $s .= " $del ";
 698                 }
 699
 700                 $lang = $this->getLanguage();
 701                 $dirmark = $lang->getDirMark();
 702
 703                 $s .= " $link";
 704                 $s .= $dirmark;
 705                 $s .= " <span class='history-user'>" .
 706                         Linker::revUserTools( $rev, true ) . "</span>";
 707                 $s .= $dirmark;
 708
 709                 if ( $rev->isMinor() ) {
 710                         $s .= ' ' . ChangesList::flag( 'minor', $this->getContext() );
 711                 }
 712
 713                 # Sometimes rev_len isn't populated
 714                 if ( $rev->getSize() !== null ) {
 715                         # Size is always public data
 716                         $prevSize = isset( $this->parentLens[$row->rev_parent_id] )
 717                                 ? $this->parentLens[$row->rev_parent_id]
 718                                 : 0;
 719                         $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 720                         $fSize = Linker::formatRevisionSize( $rev->getSize() );
 721                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . "$fSize $sDiff";
 722                 }
 723
 724                 # Text following the character difference is added just before running hooks
 725                 $s2 = Linker::revComment( $rev, false, true );
 726
 727                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 728                         $s2 .= ' <span class="updatedmarker">' . $this->msg( 'updatedmarker' )->escaped() . '</span>';
 729                         $classes[] = 'mw-history-line-updated';
 730                 }
 731
 732                 $tools = [];
 733
 734                 # Rollback and undo links
 735                 if ( $prevRev && $this->getTitle()->quickUserCan( 'edit', $user ) ) {
 736                         if ( $latest && $this->getTitle()->quickUserCan( 'rollback', $user ) ) {
 737                                 // Get a rollback link without the brackets
 738                                 $rollbackLink = Linker::generateRollback(
 739                                         $rev,
 740                                         $this->getContext(),
 741                                         [ 'verify', 'noBrackets' ]
 742                                 );
 743                                 if ( $rollbackLink ) {
 744                                         $this->preventClickjacking();
 745                                         $tools[] = $rollbackLink;
 746                                 }
 747                         }
 748
 749                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 750                                 && !$prevRev->isDeleted( Revision::DELETED_TEXT )
 751                         ) {
 752                                 # Create undo tooltip for the first (=latest) line only
 753                                 $undoTooltip = $latest
 754                                         ? [ 'title' => $this->msg( 'tooltip-undo' )->text() ]
 755                                         : [];
 756                                 $undolink = MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 757                                         $this->getTitle(),
 758                                         $this->msg( 'editundo' )->text(),
 759                                         $undoTooltip,
 760                                         [
 761                                                 'action' => 'edit',
 762                                                 'undoafter' => $prevRev->getId(),
 763                                                 'undo' => $rev->getId()
 764                                         ]
 765                                 );
 766                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 767                         }
 768                 }
 769                 // Allow extension to add their own links here
 770                 Hooks::run( 'HistoryRevisionTools', [ $rev, &$tools, $prevRev, $user ] );
 771
 772                 if ( $tools ) {
 773                         $s2 .= ' ' . $this->msg( 'parentheses' )->rawParams( $lang->pipeList( $tools ) )->escaped();
 774                 }
 775
 776                 # Tags
 777                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow(
 778                         $row->ts_tags,
 779                         'history',
 780                         $this->getContext()
 781                 );
 782                 $classes = array_merge( $classes, $newClasses );
 783                 if ( $tagSummary !== '' ) {
 784                         $s2 .= " $tagSummary";
 785                 }
 786
 787                 # Include separator between character difference and following text
 788                 if ( $s2 !== '' ) {
 789                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . $s2;
 790                 }
 791
 792                 $attribs = [ 'data-mw-revid' => $rev->getId() ];
 793
 794                 Hooks::run( 'PageHistoryLineEnding', [ $this, &$row, &$s, &$classes, &$attribs ] );
 795                 $attribs = wfArrayFilterByKey( $attribs, [ Sanitizer::class, 'isReservedDataAttribute' ] );
 796
 797                 if ( $classes ) {
 798                         $attribs['class'] = implode( ' ', $classes );
 799                 }
 800
 801                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 802         }
 803
 804         /**
 805          * Create a link to view this revision of the page
 806          *
 807          * @param Revision $rev
 808          * @return string
 809          */
 810         function revLink( $rev ) {
 811                 $date = $this->getLanguage()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 812                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 813                         $link = MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 814                                 $this->getTitle(),
 815                                 $date,
 816                                 [ 'class' => 'mw-changeslist-date' ],
 817                                 [ 'oldid' => $rev->getId() ]
 818                         );
 819                 } else {
 820                         $link = htmlspecialchars( $date );
 821                 }
 822                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 823                         $link = "<span class=\"history-deleted\">$link</span>";
 824                 }
 825
 826                 return $link;
 827         }
 828
 829         /**
 830          * Create a diff-to-current link for this revision for this page
 831          *
 832          * @param Revision $rev
 833          * @param bool $latest This is the latest revision of the page?
 834          * @return string
 835          */
 836         function curLink( $rev, $latest ) {
 837                 $cur = $this->historyPage->message['cur'];
 838                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 839                         return $cur;
 840                 } else {
 841                         return MediaWikiServices::getInstance()->getLinkRenderer()->makeKnownLink(
 842                                 $this->getTitle(),
 843                                 $cur,
 844                                 [],
 845                                 [
 846                                         'diff' => $this->getWikiPage()->getLatest(),
 847                                         'oldid' => $rev->getId()
 848                                 ]
 849                         );
 850                 }
 851         }
 852
 853         /**
 854          * Create a diff-to-previous link for this revision for this page.
 855          *
 856          * @param Revision $prevRev The revision being displayed
 857          * @param stdClass|string|null $next The next revision in list (that is
 858          *        the previous one in chronological order).
 859          *        May either be a row, "unknown" or null.
 860          * @return string
 861          */
 862         function lastLink( $prevRev, $next ) {
 863                 $last = $this->historyPage->message['last'];
 864
 865                 if ( $next === null ) {
 866                         # Probably no next row
 867                         return $last;
 868                 }
 869
 870                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
 871                 if ( $next === 'unknown' ) {
 872                         # Next row probably exists but is unknown, use an oldid=prev link
 873                         return $linkRenderer->makeKnownLink(
 874                                 $this->getTitle(),
 875                                 $last,
 876                                 [],
 877                                 [
 878                                         'diff' => $prevRev->getId(),
 879                                         'oldid' => 'prev'
 880                                 ]
 881                         );
 882                 }
 883
 884                 $nextRev = new Revision( $next );
 885
 886                 if ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 887                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 888                 ) {
 889                         return $last;
 890                 }
 891
 892                 return $linkRenderer->makeKnownLink(
 893                         $this->getTitle(),
 894                         $last,
 895                         [],
 896                         [
 897                                 'diff' => $prevRev->getId(),
 898                                 'oldid' => $next->rev_id
 899                         ]
 900                 );
 901         }
 902
 903         /**
 904          * Create radio buttons for page history
 905          *
 906          * @param Revision $rev
 907          * @param bool $firstInList Is this version the first one?
 908          *
 909          * @return string HTML output for the radio buttons
 910          */
 911         function diffButtons( $rev, $firstInList ) {
 912                 if ( $this->getNumRows() > 1 ) {
 913                         $id = $rev->getId();
 914                         $radio = [ 'type' => 'radio', 'value' => $id ];
 915                         /** @todo Move title texts to javascript */
 916                         if ( $firstInList ) {
 917                                 $first = Xml::element( 'input',
 918                                         array_merge( $radio, [
 919                                                 'style' => 'visibility:hidden',
 920                                                 'name' => 'oldid',
 921                                                 'id' => 'mw-oldid-null' ] )
 922                                 );
 923                                 $checkmark = [ 'checked' => 'checked' ];
 924                         } else {
 925                                 # Check visibility of old revisions
 926                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 927                                         $radio['disabled'] = 'disabled';
 928                                         $checkmark = []; // We will check the next possible one
 929                                 } elseif ( !$this->oldIdChecked ) {
 930                                         $checkmark = [ 'checked' => 'checked' ];
 931                                         $this->oldIdChecked = $id;
 932                                 } else {
 933                                         $checkmark = [];
 934                                 }
 935                                 $first = Xml::element( 'input',
 936                                         array_merge( $radio, $checkmark, [
 937                                                 'name' => 'oldid',
 938                                                 'id' => "mw-oldid-$id" ] ) );
 939                                 $checkmark = [];
 940                         }
 941                         $second = Xml::element( 'input',
 942                                 array_merge( $radio, $checkmark, [
 943                                         'name' => 'diff',
 944                                         'id' => "mw-diff-$id" ] ) );
 945
 946                         return $first . $second;
 947                 } else {
 948                         return '';
 949                 }
 950         }
 951
 952         /**
 953          * This is called if a write operation is possible from the generated HTML
 954          * @param bool $enable
 955          */
 956         function preventClickjacking( $enable = true ) {
 957                 $this->preventClickjacking = $enable;
 958         }
 959
 960         /**
 961          * Get the "prevent clickjacking" flag
 962          * @return bool
 963          */
 964         function getPreventClickjacking() {
 965                 return $this->preventClickjacking;
 966         }
 967
 968 }