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