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