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