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