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                         array(),
  65                         array( 'page' => $this->getTitle()->getPrefixedText() )
  66                 );
  67         }
  68
  69         /**
  70          * Get the Article object we are working on.
  71          * @return Page
  72          */
  73         public function getArticle() {
  74                 return $this->page;
  75         }
  76
  77         /**
  78          * As we use the same small set of messages in various methods and that
  79          * they are called often, we call them once and save them in $this->message
  80          */
  81         private function preCacheMessages() {
  82                 // Precache various messages
  83                 if ( !isset( $this->message ) ) {
  84                         $msgs = array( 'cur', 'last', 'pipe-separator' );
  85                         foreach ( $msgs as $msg ) {
  86                                 $this->message[$msg] = $this->msg( $msg )->escaped();
  87                         }
  88                 }
  89         }
  90
  91         /**
  92          * Print the history page for an article.
  93          */
  94         function onView() {
  95                 $out = $this->getOutput();
  96                 $request = $this->getRequest();
  97
  98                 /**
  99                  * Allow client caching.
 100                  */
 101                 if ( $out->checkLastModified( $this->page->getTouched() ) ) {
 102                         return; // Client cache fresh and headers sent, nothing more to do.
 103                 }
 104
 105                 wfProfileIn( __METHOD__ );
 106
 107                 $this->preCacheMessages();
 108                 $config = $this->context->getConfig();
 109
 110                 # Fill in the file cache if not set already
 111                 $useFileCache = $config->get( 'UseFileCache' );
 112                 if ( $useFileCache && HTMLFileCache::useFileCache( $this->getContext() ) ) {
 113                         $cache = new HTMLFileCache( $this->getTitle(), 'history' );
 114                         if ( !$cache->isCacheGood( /* Assume up to date */ ) ) {
 115                                 ob_start( array( &$cache, 'saveToFileCache' ) );
 116                         }
 117                 }
 118
 119                 // Setup page variables.
 120                 $out->setFeedAppendQuery( 'action=history' );
 121                 $out->addModules( 'mediawiki.action.history' );
 122                 if ( $config->get( 'UseMediaWikiUIEverywhere' ) ) {
 123                         $out = $this->getOutput();
 124                         $out->addModuleStyles( array(
 125                                 'mediawiki.ui.input',
 126                                 'mediawiki.ui.checkbox',
 127                         ) );
 128                 }
 129
 130                 // Handle atom/RSS feeds.
 131                 $feedType = $request->getVal( 'feed' );
 132                 if ( $feedType ) {
 133                         $this->feed( $feedType );
 134                         wfProfileOut( __METHOD__ );
 135
 136                         return;
 137                 }
 138
 139                 // Fail nicely if article doesn't exist.
 140                 if ( !$this->page->exists() ) {
 141                         $out->addWikiMsg( 'nohistory' );
 142                         # show deletion/move log if there is an entry
 143                         LogEventsList::showLogExtract(
 144                                 $out,
 145                                 array( 'delete', 'move' ),
 146                                 $this->getTitle(),
 147                                 '',
 148                                 array( 'lim' => 10,
 149                                         'conds' => array( "log_action != 'revision'" ),
 150                                         'showIfEmpty' => false,
 151                                         'msgKey' => array( 'moveddeleted-notice' )
 152                                 )
 153                         );
 154                         wfProfileOut( __METHOD__ );
 155
 156                         return;
 157                 }
 158
 159                 /**
 160                  * Add date selector to quickly get to a certain time
 161                  */
 162                 $year = $request->getInt( 'year' );
 163                 $month = $request->getInt( 'month' );
 164                 $tagFilter = $request->getVal( 'tagfilter' );
 165                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 166
 167                 /**
 168                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 169                  */
 170                 if ( $request->getBool( 'deleted' ) ) {
 171                         $conds = array( 'rev_deleted != 0' );
 172                 } else {
 173                         $conds = array();
 174                 }
 175                 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
 176                         $checkDeleted = Xml::checkLabel( $this->msg( 'history-show-deleted' )->text(),
 177                                 'deleted', 'mw-show-deleted-only', $request->getBool( 'deleted' ) ) . "\n";
 178                 } else {
 179                         $checkDeleted = '';
 180                 }
 181
 182                 // Add the general form
 183                 $action = htmlspecialchars( wfScript() );
 184                 $out->addHTML(
 185                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 186                         Xml::fieldset(
 187                                 $this->msg( 'history-fieldset-title' )->text(),
 188                                 false,
 189                                 array( 'id' => 'mw-history-search' )
 190                         ) .
 191                         Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n" .
 192                         Html::hidden( 'action', 'history' ) . "\n" .
 193                         Xml::dateMenu(
 194                                 ( $year == null ? MWTimestamp::getLocalInstance()->format( 'Y' ) : $year ),
 195                                 $month
 196                         ) . '&#160;' .
 197                         ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
 198                         $checkDeleted .
 199                         Html::submitButton(
 200                                 $this->msg( 'allpagessubmit' )->text(),
 201                                 array(),
 202                                 array( 'mw-ui-progressive' )
 203                         ) . "\n" .
 204                         '</fieldset></form>'
 205                 );
 206
 207                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->page, $this->getContext() ) );
 208
 209                 // Create and output the list.
 210                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 211                 $out->addHTML(
 212                         $pager->getNavigationBar() .
 213                         $pager->getBody() .
 214                         $pager->getNavigationBar()
 215                 );
 216                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 217
 218                 wfProfileOut( __METHOD__ );
 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( array() );
 235                 }
 236
 237                 $dbr = wfGetDB( DB_SLAVE );
 238
 239                 if ( $direction === self::DIR_PREV ) {
 240                         list( $dirs, $oper ) = array( "ASC", ">=" );
 241                 } else { /* $direction === self::DIR_NEXT */
 242                         list( $dirs, $oper ) = array( "DESC", "<=" );
 243                 }
 244
 245                 if ( $offset ) {
 246                         $offsets = array( "rev_timestamp $oper " . $dbr->addQuotes( $dbr->timestamp( $offset ) ) );
 247                 } else {
 248                         $offsets = array();
 249                 }
 250
 251                 $page_id = $this->page->getId();
 252
 253                 return $dbr->select( 'revision',
 254                         Revision::selectFields(),
 255                         array_merge( array( 'rev_page' => $page_id ), $offsets ),
 256                         __METHOD__,
 257                         array( '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         /**
 378          * @param HistoryAction $historyPage
 379          * @param string $year
 380          * @param string $month
 381          * @param string $tagFilter
 382          * @param array $conds
 383          */
 384         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
 385                 parent::__construct( $historyPage->getContext() );
 386                 $this->historyPage = $historyPage;
 387                 $this->tagFilter = $tagFilter;
 388                 $this->getDateCond( $year, $month );
 389                 $this->conds = $conds;
 390         }
 391
 392         // For hook compatibility...
 393         function getArticle() {
 394                 return $this->historyPage->getArticle();
 395         }
 396
 397         function getSqlComment() {
 398                 if ( $this->conds ) {
 399                         return 'history page filtered'; // potentially slow, see CR r58153
 400                 } else {
 401                         return 'history page unfiltered';
 402                 }
 403         }
 404
 405         function getQueryInfo() {
 406                 $queryInfo = array(
 407                         'tables' => array( 'revision', 'user' ),
 408                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 409                         'conds' => array_merge(
 410                                 array( 'rev_page' => $this->getWikiPage()->getId() ),
 411                                 $this->conds ),
 412                         'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
 413                         'join_conds' => array( 'user' => Revision::userJoinCond() ),
 414                 );
 415                 ChangeTags::modifyDisplayQuery(
 416                         $queryInfo['tables'],
 417                         $queryInfo['fields'],
 418                         $queryInfo['conds'],
 419                         $queryInfo['join_conds'],
 420                         $queryInfo['options'],
 421                         $this->tagFilter
 422                 );
 423                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 424
 425                 return $queryInfo;
 426         }
 427
 428         function getIndexField() {
 429                 return 'rev_timestamp';
 430         }
 431
 432         /**
 433          * @param stdClass $row
 434          * @return string
 435          */
 436         function formatRow( $row ) {
 437                 if ( $this->lastRow ) {
 438                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 439                         $firstInList = $this->counter == 1;
 440                         $this->counter++;
 441                         $s = $this->historyLine( $this->lastRow, $row,
 442                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 443                 } else {
 444                         $s = '';
 445                 }
 446                 $this->lastRow = $row;
 447
 448                 return $s;
 449         }
 450
 451         function doBatchLookups() {
 452                 # Do a link batch query
 453                 $this->mResult->seek( 0 );
 454                 $batch = new LinkBatch();
 455                 $revIds = array();
 456                 foreach ( $this->mResult as $row ) {
 457                         if ( $row->rev_parent_id ) {
 458                                 $revIds[] = $row->rev_parent_id;
 459                         }
 460                         if ( !is_null( $row->user_name ) ) {
 461                                 $batch->add( NS_USER, $row->user_name );
 462                                 $batch->add( NS_USER_TALK, $row->user_name );
 463                         } else { # for anons or usernames of imported revisions
 464                                 $batch->add( NS_USER, $row->rev_user_text );
 465                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 466                         }
 467                 }
 468                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 469                 $batch->execute();
 470                 $this->mResult->seek( 0 );
 471         }
 472
 473         /**
 474          * Creates begin of history list with a submit button
 475          *
 476          * @return string HTML output
 477          */
 478         function getStartBody() {
 479                 $this->lastRow = false;
 480                 $this->counter = 1;
 481                 $this->oldIdChecked = 0;
 482
 483                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 484                 $s = Html::openElement( 'form', array( 'action' => wfScript(),
 485                         'id' => 'mw-history-compare' ) ) . "\n";
 486                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 487                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 488
 489                 // Button container stored in $this->buttons for re-use in getEndBody()
 490                 $this->buttons = '<div>';
 491                 $className = 'historysubmit mw-history-compareselectedversions-button';
 492                 $attrs = array( 'class' => $className )
 493                         + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' );
 494                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 495                         $attrs
 496                 ) . "\n";
 497
 498                 if ( $this->getUser()->isAllowed( 'deleterevision' ) ) {
 499                         $this->buttons .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 500                 }
 501                 $this->buttons .= '</div>';
 502
 503                 $s .= $this->buttons;
 504                 $s .= '<ul id="pagehistory">' . "\n";
 505
 506                 return $s;
 507         }
 508
 509         private function getRevisionButton( $name, $msg ) {
 510                 $this->preventClickjacking();
 511                 # Note bug #20966, <button> is non-standard in IE<8
 512                 $element = Html::element(
 513                         'button',
 514                         array(
 515                                 'type' => 'submit',
 516                                 'name' => $name,
 517                                 'value' => '1',
 518                                 'class' => "historysubmit mw-history-$name-button",
 519                         ),
 520                         $this->msg( $msg )->text()
 521                 ) . "\n";
 522                 return $element;
 523         }
 524
 525         function getEndBody() {
 526                 if ( $this->lastRow ) {
 527                         $latest = $this->counter == 1 && $this->mIsFirst;
 528                         $firstInList = $this->counter == 1;
 529                         if ( $this->mIsBackwards ) {
 530                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 531                                 if ( $this->mOffset == '' ) {
 532                                         $next = null;
 533                                 } else {
 534                                         $next = 'unknown';
 535                                 }
 536                         } else {
 537                                 # The next row is the past-the-end row
 538                                 $next = $this->mPastTheEndRow;
 539                         }
 540                         $this->counter++;
 541                         $s = $this->historyLine( $this->lastRow, $next,
 542                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 543                 } else {
 544                         $s = '';
 545                 }
 546                 $s .= "</ul>\n";
 547                 # Add second buttons only if there is more than one rev
 548                 if ( $this->getNumRows() > 2 ) {
 549                         $s .= $this->buttons;
 550                 }
 551                 $s .= '</form>';
 552
 553                 return $s;
 554         }
 555
 556         /**
 557          * Creates a submit button
 558          *
 559          * @param string $message Text of the submit button, will be escaped
 560          * @param array $attributes Attributes
 561          * @return string HTML output for the submit button
 562          */
 563         function submitButton( $message, $attributes = array() ) {
 564                 # Disable submit button if history has 1 revision only
 565                 if ( $this->getNumRows() > 1 ) {
 566                         return Html::submitButton( $message, $attributes );
 567                 } else {
 568                         return '';
 569                 }
 570         }
 571
 572         /**
 573          * Returns a row from the history printout.
 574          *
 575          * @todo document some more, and maybe clean up the code (some params redundant?)
 576          *
 577          * @param stdClass $row The database row corresponding to the previous line.
 578          * @param mixed $next The database row corresponding to the next line
 579          *   (chronologically previous)
 580          * @param bool|string $notificationtimestamp
 581          * @param bool $latest Whether this row corresponds to the page's latest revision.
 582          * @param bool $firstInList Whether this row corresponds to the first
 583          *   displayed on this history page.
 584          * @return string HTML output for the row
 585          */
 586         function historyLine( $row, $next, $notificationtimestamp = false,
 587                 $latest = false, $firstInList = false ) {
 588                 $rev = new Revision( $row );
 589                 $rev->setTitle( $this->getTitle() );
 590
 591                 if ( is_object( $next ) ) {
 592                         $prevRev = new Revision( $next );
 593                         $prevRev->setTitle( $this->getTitle() );
 594                 } else {
 595                         $prevRev = null;
 596                 }
 597
 598                 $curlink = $this->curLink( $rev, $latest );
 599                 $lastlink = $this->lastLink( $rev, $next );
 600                 $curLastlinks = $curlink . $this->historyPage->message['pipe-separator'] . $lastlink;
 601                 $histLinks = Html::rawElement(
 602                         'span',
 603                         array( 'class' => 'mw-history-histlinks' ),
 604                         $this->msg( 'parentheses' )->rawParams( $curLastlinks )->escaped()
 605                 );
 606
 607                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 608                 $s = $histLinks . $diffButtons;
 609
 610                 $link = $this->revLink( $rev );
 611                 $classes = array();
 612
 613                 $del = '';
 614                 $user = $this->getUser();
 615                 // Show checkboxes for each revision
 616                 if ( $user->isAllowed( 'deleterevision' ) ) {
 617                         $this->preventClickjacking();
 618                         // If revision was hidden from sysops, disable the checkbox
 619                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 620                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 621                         // Otherwise, enable the checkbox...
 622                         } else {
 623                                 $del = Xml::check( 'showhiderevisions', false,
 624                                         array( 'name' => 'ids[' . $rev->getId() . ']' ) );
 625                         }
 626                 // User can only view deleted revisions...
 627                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 628                         // If revision was hidden from sysops, disable the link
 629                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 630                                 $del = Linker::revDeleteLinkDisabled( false );
 631                         // Otherwise, show the link...
 632                         } else {
 633                                 $query = array( 'type' => 'revision',
 634                                         'target' => $this->getTitle()->getPrefixedDBkey(), 'ids' => $rev->getId() );
 635                                 $del .= Linker::revDeleteLink( $query,
 636                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 637                         }
 638                 }
 639                 if ( $del ) {
 640                         $s .= " $del ";
 641                 }
 642
 643                 $lang = $this->getLanguage();
 644                 $dirmark = $lang->getDirMark();
 645
 646                 $s .= " $link";
 647                 $s .= $dirmark;
 648                 $s .= " <span class='history-user'>" .
 649                         Linker::revUserTools( $rev, true ) . "</span>";
 650                 $s .= $dirmark;
 651
 652                 if ( $rev->isMinor() ) {
 653                         $s .= ' ' . ChangesList::flag( 'minor' );
 654                 }
 655
 656                 # Sometimes rev_len isn't populated
 657                 if ( $rev->getSize() !== null ) {
 658                         # Size is always public data
 659                         $prevSize = isset( $this->parentLens[$row->rev_parent_id] )
 660                                 ? $this->parentLens[$row->rev_parent_id]
 661                                 : 0;
 662                         $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 663                         $fSize = Linker::formatRevisionSize( $rev->getSize() );
 664                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . "$fSize $sDiff";
 665                 }
 666
 667                 # Text following the character difference is added just before running hooks
 668                 $s2 = Linker::revComment( $rev, false, true );
 669
 670                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 671                         $s2 .= ' <span class="updatedmarker">' . $this->msg( 'updatedmarker' )->escaped() . '</span>';
 672                         $classes[] = 'mw-history-line-updated';
 673                 }
 674
 675                 $tools = array();
 676
 677                 # Rollback and undo links
 678                 if ( $prevRev && $this->getTitle()->quickUserCan( 'edit', $user ) ) {
 679                         if ( $latest && $this->getTitle()->quickUserCan( 'rollback', $user ) ) {
 680                                 // Get a rollback link without the brackets
 681                                 $rollbackLink = Linker::generateRollback(
 682                                         $rev,
 683                                         $this->getContext(),
 684                                         array( 'verify', 'noBrackets' )
 685                                 );
 686                                 if ( $rollbackLink ) {
 687                                         $this->preventClickjacking();
 688                                         $tools[] = $rollbackLink;
 689                                 }
 690                         }
 691
 692                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 693                                 && !$prevRev->isDeleted( Revision::DELETED_TEXT )
 694                         ) {
 695                                 # Create undo tooltip for the first (=latest) line only
 696                                 $undoTooltip = $latest
 697                                         ? array( 'title' => $this->msg( 'tooltip-undo' )->text() )
 698                                         : array();
 699                                 $undolink = Linker::linkKnown(
 700                                         $this->getTitle(),
 701                                         $this->msg( 'editundo' )->escaped(),
 702                                         $undoTooltip,
 703                                         array(
 704                                                 'action' => 'edit',
 705                                                 'undoafter' => $prevRev->getId(),
 706                                                 'undo' => $rev->getId()
 707                                         )
 708                                 );
 709                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 710                         }
 711                 }
 712                 // Allow extension to add their own links here
 713                 wfRunHooks( 'HistoryRevisionTools', array( $rev, &$tools ) );
 714
 715                 if ( $tools ) {
 716                         $s2 .= ' ' . $this->msg( 'parentheses' )->rawParams( $lang->pipeList( $tools ) )->escaped();
 717                 }
 718
 719                 # Tags
 720                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 721                 $classes = array_merge( $classes, $newClasses );
 722                 if ( $tagSummary !== '' ) {
 723                         $s2 .= " $tagSummary";
 724                 }
 725
 726                 # Include separator between character difference and following text
 727                 if ( $s2 !== '' ) {
 728                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . $s2;
 729                 }
 730
 731                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row, &$s, &$classes ) );
 732
 733                 $attribs = array();
 734                 if ( $classes ) {
 735                         $attribs['class'] = implode( ' ', $classes );
 736                 }
 737
 738                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 739         }
 740
 741         /**
 742          * Create a link to view this revision of the page
 743          *
 744          * @param Revision $rev
 745          * @return string
 746          */
 747         function revLink( $rev ) {
 748                 $date = $this->getLanguage()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 749                 $date = htmlspecialchars( $date );
 750                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 751                         $link = Linker::linkKnown(
 752                                 $this->getTitle(),
 753                                 $date,
 754                                 array( 'class' => 'mw-changeslist-date' ),
 755                                 array( 'oldid' => $rev->getId() )
 756                         );
 757                 } else {
 758                         $link = $date;
 759                 }
 760                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 761                         $link = "<span class=\"history-deleted\">$link</span>";
 762                 }
 763
 764                 return $link;
 765         }
 766
 767         /**
 768          * Create a diff-to-current link for this revision for this page
 769          *
 770          * @param Revision $rev
 771          * @param bool $latest This is the latest revision of the page?
 772          * @return string
 773          */
 774         function curLink( $rev, $latest ) {
 775                 $cur = $this->historyPage->message['cur'];
 776                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 777                         return $cur;
 778                 } else {
 779                         return Linker::linkKnown(
 780                                 $this->getTitle(),
 781                                 $cur,
 782                                 array(),
 783                                 array(
 784                                         'diff' => $this->getWikiPage()->getLatest(),
 785                                         'oldid' => $rev->getId()
 786                                 )
 787                         );
 788                 }
 789         }
 790
 791         /**
 792          * Create a diff-to-previous link for this revision for this page.
 793          *
 794          * @param Revision $prevRev The revision being displayed
 795          * @param stdClass|string|null $next The next revision in list (that is
 796          *        the previous one in chronological order).
 797          *        May either be a row, "unknown" or null.
 798          * @return string
 799          */
 800         function lastLink( $prevRev, $next ) {
 801                 $last = $this->historyPage->message['last'];
 802
 803                 if ( $next === null ) {
 804                         # Probably no next row
 805                         return $last;
 806                 }
 807
 808                 if ( $next === 'unknown' ) {
 809                         # Next row probably exists but is unknown, use an oldid=prev link
 810                         return Linker::linkKnown(
 811                                 $this->getTitle(),
 812                                 $last,
 813                                 array(),
 814                                 array(
 815                                         'diff' => $prevRev->getId(),
 816                                         'oldid' => 'prev'
 817                                 )
 818                         );
 819                 }
 820
 821                 $nextRev = new Revision( $next );
 822
 823                 if ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 824                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 825                 ) {
 826                         return $last;
 827                 }
 828
 829                 return Linker::linkKnown(
 830                         $this->getTitle(),
 831                         $last,
 832                         array(),
 833                         array(
 834                                 'diff' => $prevRev->getId(),
 835                                 'oldid' => $next->rev_id
 836                         )
 837                 );
 838         }
 839
 840         /**
 841          * Create radio buttons for page history
 842          *
 843          * @param Revision $rev
 844          * @param bool $firstInList Is this version the first one?
 845          *
 846          * @return string HTML output for the radio buttons
 847          */
 848         function diffButtons( $rev, $firstInList ) {
 849                 if ( $this->getNumRows() > 1 ) {
 850                         $id = $rev->getId();
 851                         $radio = array( 'type' => 'radio', 'value' => $id );
 852                         /** @todo Move title texts to javascript */
 853                         if ( $firstInList ) {
 854                                 $first = Xml::element( 'input',
 855                                         array_merge( $radio, array(
 856                                                 'style' => 'visibility:hidden',
 857                                                 'name' => 'oldid',
 858                                                 'id' => 'mw-oldid-null' ) )
 859                                 );
 860                                 $checkmark = array( 'checked' => 'checked' );
 861                         } else {
 862                                 # Check visibility of old revisions
 863                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 864                                         $radio['disabled'] = 'disabled';
 865                                         $checkmark = array(); // We will check the next possible one
 866                                 } elseif ( !$this->oldIdChecked ) {
 867                                         $checkmark = array( 'checked' => 'checked' );
 868                                         $this->oldIdChecked = $id;
 869                                 } else {
 870                                         $checkmark = array();
 871                                 }
 872                                 $first = Xml::element( 'input',
 873                                         array_merge( $radio, $checkmark, array(
 874                                                 'name' => 'oldid',
 875                                                 'id' => "mw-oldid-$id" ) ) );
 876                                 $checkmark = array();
 877                         }
 878                         $second = Xml::element( 'input',
 879                                 array_merge( $radio, $checkmark, array(
 880                                         'name' => 'diff',
 881                                         'id' => "mw-diff-$id" ) ) );
 882
 883                         return $first . $second;
 884                 } else {
 885                         return '';
 886                 }
 887         }
 888
 889         /**
 890          * This is called if a write operation is possible from the generated HTML
 891          * @param bool $enable
 892          */
 893         function preventClickjacking( $enable = true ) {
 894                 $this->preventClickjacking = $enable;
 895         }
 896
 897         /**
 898          * Get the "prevent clickjacking" flag
 899          * @return bool
 900          */
 901         function getPreventClickjacking() {
 902                 return $this->preventClickjacking;
 903         }
 904 }