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