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