includes/actions/HistoryAction.php

   1 <?php
   2 /**
   3  * Page history
   4  *
   5  * Split off from Article.php and Skin.php, 2003-12-22
   6  * @file
   7  */
   8
   9 /**
  10  * This class handles printing the history page for an article.  In order to
  11  * be efficient, it uses timestamps rather than offsets for paging, to avoid
  12  * costly LIMIT,offset queries.
  13  *
  14  * Construct it by passing in an Article, and call $h->history() to print the
  15  * history.
  16  *
  17  */
  18 class HistoryAction extends FormlessAction {
  19         const DIR_PREV = 0;
  20         const DIR_NEXT = 1;
  21
  22         public function getName() {
  23                 return 'history';
  24         }
  25
  26         public function getRestriction() {
  27                 return 'read';
  28         }
  29
  30         public function requiresWrite() {
  31                 return false;
  32         }
  33
  34         public function requiresUnblock() {
  35                 return false;
  36         }
  37
  38         protected function getPageTitle() {
  39                 return $this->msg( 'history-title', $this->getTitle()->getPrefixedText() )->text();
  40         }
  41
  42         protected function getDescription() {
  43                 // Creation of a subtitle link pointing to [[Special:Log]]
  44                 return Linker::linkKnown(
  45                         SpecialPage::getTitleFor( 'Log' ),
  46                         $this->msg( 'viewpagelogs' )->escaped(),
  47                         array(),
  48                         array( 'page' => $this->getTitle()->getPrefixedText() )
  49                 );
  50         }
  51
  52         /**
  53          * Get the Article object we are working on.
  54          * @return Page
  55          */
  56         public function getArticle() {
  57                 return $this->page;
  58         }
  59
  60         /**
  61          * As we use the same small set of messages in various methods and that
  62          * they are called often, we call them once and save them in $this->message
  63          */
  64         private function preCacheMessages() {
  65                 // Precache various messages
  66                 if ( !isset( $this->message ) ) {
  67                         $msgs = array( 'cur', 'last', 'pipe-separator' );
  68                         foreach ( $msgs as $msg ) {
  69                                 $this->message[$msg] = $this->msg( $msg )->escaped();
  70                         }
  71                 }
  72         }
  73
  74         /**
  75          * Print the history page for an article.
  76          * @return nothing
  77          */
  78         function onView() {
  79                 global $wgScript, $wgUseFileCache, $wgSquidMaxage;
  80
  81                 $out = $this->getOutput();
  82                 $request = $this->getRequest();
  83
  84                 /**
  85                  * Allow client caching.
  86                  */
  87                 if ( $out->checkLastModified( $this->page->getTouched() ) ) {
  88                         return; // Client cache fresh and headers sent, nothing more to do.
  89                 }
  90
  91                 wfProfileIn( __METHOD__ );
  92
  93                 if ( $request->getFullRequestURL() == $this->getTitle()->getInternalURL( 'action=history' ) ) {
  94                         $out->setSquidMaxage( $wgSquidMaxage );
  95                 }
  96
  97                 $this->preCacheMessages();
  98
  99                 # Fill in the file cache if not set already
 100                 if ( $wgUseFileCache && HTMLFileCache::useFileCache( $this->getContext() ) ) {
 101                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'history' );
 102                         if ( !$cache->isCacheGood( /* Assume up to date */ ) ) {
 103                                 ob_start( array( &$cache, 'saveToFileCache' ) );
 104                         }
 105                 }
 106
 107                 // Setup page variables.
 108                 $out->setFeedAppendQuery( 'action=history' );
 109                 $out->addModules( array( 'mediawiki.legacy.history', 'mediawiki.action.history' ) );
 110
 111                 // Handle atom/RSS feeds.
 112                 $feedType = $request->getVal( 'feed' );
 113                 if ( $feedType ) {
 114                         wfProfileOut( __METHOD__ );
 115                         return $this->feed( $feedType );
 116                 }
 117
 118                 // Fail nicely if article doesn't exist.
 119                 if ( !$this->getTitle()->exists() ) {
 120                         $out->addWikiMsg( 'nohistory' );
 121                         # show deletion/move log if there is an entry
 122                         LogEventsList::showLogExtract(
 123                                 $out,
 124                                 array( 'delete', 'move' ),
 125                                 $this->getTitle(),
 126                                 '',
 127                                 array(  'lim' => 10,
 128                                         'conds' => array( "log_action != 'revision'" ),
 129                                         'showIfEmpty' => false,
 130                                         'msgKey' => array( 'moveddeleted-notice' )
 131                                 )
 132                         );
 133                         wfProfileOut( __METHOD__ );
 134                         return;
 135                 }
 136
 137                 /**
 138                  * Add date selector to quickly get to a certain time
 139                  */
 140                 $year        = $request->getInt( 'year' );
 141                 $month       = $request->getInt( 'month' );
 142                 $tagFilter   = $request->getVal( 'tagfilter' );
 143                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 144
 145                 /**
 146                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 147                  */
 148                 if ( $request->getBool( 'deleted' ) ) {
 149                         $conds = array( "rev_deleted != '0'" );
 150                 } else {
 151                         $conds = array();
 152                 }
 153                 $checkDeleted = Xml::checkLabel( $this->msg( 'history-show-deleted' )->text(),
 154                         'deleted', 'mw-show-deleted-only', $request->getBool( 'deleted' ) ) . "\n";
 155
 156                 // Add the general form
 157                 $action = htmlspecialchars( $wgScript );
 158                 $out->addHTML(
 159                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 160                         Xml::fieldset(
 161                                 $this->msg( 'history-fieldset-title' )->text(),
 162                                 false,
 163                                 array( 'id' => 'mw-history-search' )
 164                         ) .
 165                         Html::hidden( 'title', $this->getTitle()->getPrefixedDBKey() ) . "\n" .
 166                         Html::hidden( 'action', 'history' ) . "\n" .
 167                         Xml::dateMenu( $year, $month ) . '&#160;' .
 168                         ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
 169                         $checkDeleted .
 170                         Xml::submitButton( $this->msg( 'allpagessubmit' )->text() ) . "\n" .
 171                         '</fieldset></form>'
 172                 );
 173
 174                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->article ) );
 175
 176                 // Create and output the list.
 177                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 178                 $out->addHTML(
 179                         $pager->getNavigationBar() .
 180                         $pager->getBody() .
 181                         $pager->getNavigationBar()
 182                 );
 183                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 184
 185                 wfProfileOut( __METHOD__ );
 186         }
 187
 188         /**
 189          * Fetch an array of revisions, specified by a given limit, offset and
 190          * direction. This is now only used by the feeds. It was previously
 191          * used by the main UI but that's now handled by the pager.
 192          *
 193          * @param $limit Integer: the limit number of revisions to get
 194          * @param $offset Integer
 195          * @param $direction Integer: either HistoryPage::DIR_PREV or HistoryPage::DIR_NEXT
 196          * @return ResultWrapper
 197          */
 198         function fetchRevisions( $limit, $offset, $direction ) {
 199                 $dbr = wfGetDB( DB_SLAVE );
 200
 201                 if ( $direction == HistoryPage::DIR_PREV ) {
 202                         list( $dirs, $oper ) = array( "ASC", ">=" );
 203                 } else { /* $direction == HistoryPage::DIR_NEXT */
 204                         list( $dirs, $oper ) = array( "DESC", "<=" );
 205                 }
 206
 207                 if ( $offset ) {
 208                         $offsets = array( "rev_timestamp $oper '$offset'" );
 209                 } else {
 210                         $offsets = array();
 211                 }
 212
 213                 $page_id = $this->getTitle()->getArticleID();
 214
 215                 return $dbr->select( 'revision',
 216                         Revision::selectFields(),
 217                         array_merge( array( "rev_page=$page_id" ), $offsets ),
 218                         __METHOD__,
 219                         array( 'ORDER BY' => "rev_timestamp $dirs",
 220                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit )
 221                 );
 222         }
 223
 224         /**
 225          * Output a subscription feed listing recent edits to this page.
 226          *
 227          * @param $type String: feed type
 228          */
 229         function feed( $type ) {
 230                 global $wgFeedClasses, $wgFeedLimit;
 231                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 232                         return;
 233                 }
 234                 $request = $this->getRequest();
 235
 236                 $feed = new $wgFeedClasses[$type](
 237                         $this->getTitle()->getPrefixedText() . ' - ' .
 238                         wfMsgForContent( 'history-feed-title' ),
 239                         wfMsgForContent( 'history-feed-description' ),
 240                         $this->getTitle()->getFullUrl( 'action=history' )
 241                 );
 242
 243                 // Get a limit on number of feed entries. Provide a sane default
 244                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 245                 $limit = $request->getInt( 'limit', 10 );
 246                 if ( $limit > $wgFeedLimit || $limit < 1 ) {
 247                         $limit = 10;
 248                 }
 249                 $items = $this->fetchRevisions( $limit, 0, HistoryPage::DIR_NEXT );
 250
 251                 // Generate feed elements enclosed between header and footer.
 252                 $feed->outHeader();
 253                 if ( $items->numRows() ) {
 254                         foreach ( $items as $row ) {
 255                                 $feed->outItem( $this->feedItem( $row ) );
 256                         }
 257                 } else {
 258                         $feed->outItem( $this->feedEmpty() );
 259                 }
 260                 $feed->outFooter();
 261         }
 262
 263         function feedEmpty() {
 264                 return new FeedItem(
 265                         wfMsgForContent( 'nohistory' ),
 266                         $this->getOutput()->parse( wfMsgForContent( 'history-feed-empty' ) ),
 267                         $this->getTitle()->getFullUrl(),
 268                         wfTimestamp( TS_MW ),
 269                         '',
 270                         $this->getTitle()->getTalkPage()->getFullUrl()
 271                 );
 272         }
 273
 274         /**
 275          * Generate a FeedItem object from a given revision table row
 276          * Borrows Recent Changes' feed generation functions for formatting;
 277          * includes a diff to the previous revision (if any).
 278          *
 279          * @param $row Object: database row
 280          * @return FeedItem
 281          */
 282         function feedItem( $row ) {
 283                 $rev = new Revision( $row );
 284                 $rev->setTitle( $this->getTitle() );
 285                 $text = FeedUtils::formatDiffRow(
 286                         $this->getTitle(),
 287                         $this->getTitle()->getPreviousRevisionID( $rev->getId() ),
 288                         $rev->getId(),
 289                         $rev->getTimestamp(),
 290                         $rev->getComment()
 291                 );
 292                 if ( $rev->getComment() == '' ) {
 293                         global $wgContLang;
 294                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 295                                 $rev->getUserText(),
 296                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 297                                 $wgContLang->date( $rev->getTimestamp() ),
 298                                 $wgContLang->time( $rev->getTimestamp() )
 299                         );
 300                 } else {
 301                         $title = $rev->getUserText() .
 302                         wfMsgForContent( 'colon-separator' ) .
 303                         FeedItem::stripComment( $rev->getComment() );
 304                 }
 305                 return new FeedItem(
 306                         $title,
 307                         $text,
 308                         $this->getTitle()->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 309                         $rev->getTimestamp(),
 310                         $rev->getUserText(),
 311                         $this->getTitle()->getTalkPage()->getFullUrl()
 312                 );
 313         }
 314 }
 315
 316 /**
 317  * @ingroup Pager
 318  */
 319 class HistoryPager extends ReverseChronologicalPager {
 320         public $lastRow = false, $counter, $historyPage, $buttons, $conds;
 321         protected $oldIdChecked;
 322         protected $preventClickjacking = false;
 323
 324         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
 325                 parent::__construct( $historyPage->getContext() );
 326                 $this->historyPage = $historyPage;
 327                 $this->tagFilter = $tagFilter;
 328                 $this->getDateCond( $year, $month );
 329                 $this->conds = $conds;
 330         }
 331
 332         // For hook compatibility...
 333         function getArticle() {
 334                 return $this->historyPage->getArticle();
 335         }
 336
 337         function getSqlComment() {
 338                 if ( $this->conds ) {
 339                         return 'history page filtered'; // potentially slow, see CR r58153
 340                 } else {
 341                         return 'history page unfiltered';
 342                 }
 343         }
 344
 345         function getQueryInfo() {
 346                 $queryInfo = array(
 347                         'tables'  => array( 'revision', 'user' ),
 348                         'fields'  => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 349                         'conds'   => array_merge(
 350                                 array( 'rev_page' => $this->getTitle()->getArticleID() ),
 351                                 $this->conds ),
 352                         'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
 353                         'join_conds' => array(
 354                                 'user'        => array( 'LEFT JOIN', 'rev_user != 0 AND user_id = rev_user' ),
 355                                 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
 356                 );
 357                 ChangeTags::modifyDisplayQuery(
 358                         $queryInfo['tables'],
 359                         $queryInfo['fields'],
 360                         $queryInfo['conds'],
 361                         $queryInfo['join_conds'],
 362                         $queryInfo['options'],
 363                         $this->tagFilter
 364                 );
 365                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 366                 return $queryInfo;
 367         }
 368
 369         function getIndexField() {
 370                 return 'rev_timestamp';
 371         }
 372
 373         function formatRow( $row ) {
 374                 if ( $this->lastRow ) {
 375                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 376                         $firstInList = $this->counter == 1;
 377                         $this->counter++;
 378                         $s = $this->historyLine( $this->lastRow, $row,
 379                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 380                 } else {
 381                         $s = '';
 382                 }
 383                 $this->lastRow = $row;
 384                 return $s;
 385         }
 386
 387         function doBatchLookups() {
 388                 # Do a link batch query
 389                 $this->mResult->seek( 0 );
 390                 $batch = new LinkBatch();
 391                 # Give some pointers to make (last) links
 392                 foreach ( $this->mResult as $row ) {
 393                         $batch->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
 394                         $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );
 395                 }
 396                 $batch->execute();
 397                 $this->mResult->seek( 0 );
 398         }
 399
 400         /**
 401          * Creates begin of history list with a submit button
 402          *
 403          * @return string HTML output
 404          */
 405         function getStartBody() {
 406                 global $wgScript;
 407                 $this->lastRow = false;
 408                 $this->counter = 1;
 409                 $this->oldIdChecked = 0;
 410
 411                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 412                 $s = Html::openElement( 'form', array( 'action' => $wgScript,
 413                         'id' => 'mw-history-compare' ) ) . "\n";
 414                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDbKey() ) . "\n";
 415                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 416
 417                 $s .= '<div>' . $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 418                         array( 'class' => 'historysubmit' ) ) . "\n";
 419
 420                 $this->buttons = '<div>';
 421                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 422                         array( 'class' => 'historysubmit' )
 423                                 + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' )
 424                 ) . "\n";
 425
 426                 if ( $this->getUser()->isAllowed( 'deleterevision' ) ) {
 427                         $s .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 428                 }
 429                 $this->buttons .= '</div>';
 430                 $s .= '</div><ul id="pagehistory">' . "\n";
 431                 return $s;
 432         }
 433
 434         private function getRevisionButton( $name, $msg ) {
 435                 $this->preventClickjacking();
 436                 # Note bug #20966, <button> is non-standard in IE<8
 437                 $element = Html::element( 'button',
 438                         array(
 439                                 'type' => 'submit',
 440                                 'name' => $name,
 441                                 'value' => '1',
 442                                 'class' => "mw-history-$name-button",
 443                         ),
 444                         $this->msg( $msg )->text()
 445                 ) . "\n";
 446                 $this->buttons .= $element;
 447                 return $element;
 448         }
 449
 450         function getEndBody() {
 451                 if ( $this->lastRow ) {
 452                         $latest = $this->counter == 1 && $this->mIsFirst;
 453                         $firstInList = $this->counter == 1;
 454                         if ( $this->mIsBackwards ) {
 455                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 456                                 if ( $this->mOffset == '' ) {
 457                                         $next = null;
 458                                 } else {
 459                                         $next = 'unknown';
 460                                 }
 461                         } else {
 462                                 # The next row is the past-the-end row
 463                                 $next = $this->mPastTheEndRow;
 464                         }
 465                         $this->counter++;
 466                         $s = $this->historyLine( $this->lastRow, $next,
 467                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 468                 } else {
 469                         $s = '';
 470                 }
 471                 $s .= "</ul>\n";
 472                 # Add second buttons only if there is more than one rev
 473                 if ( $this->getNumRows() > 2 ) {
 474                         $s .= $this->buttons;
 475                 }
 476                 $s .= '</form>';
 477                 return $s;
 478         }
 479
 480         /**
 481          * Creates a submit button
 482          *
 483          * @param $message String: text of the submit button, will be escaped
 484          * @param $attributes Array: attributes
 485          * @return String: HTML output for the submit button
 486          */
 487         function submitButton( $message, $attributes = array() ) {
 488                 # Disable submit button if history has 1 revision only
 489                 if ( $this->getNumRows() > 1 ) {
 490                         return Xml::submitButton( $message , $attributes );
 491                 } else {
 492                         return '';
 493                 }
 494         }
 495
 496         /**
 497          * Returns a row from the history printout.
 498          *
 499          * @todo document some more, and maybe clean up the code (some params redundant?)
 500          *
 501          * @param $row Object: the database row corresponding to the previous line.
 502          * @param $next Mixed: the database row corresponding to the next line.
 503          * @param $notificationtimestamp
 504          * @param $latest Boolean: whether this row corresponds to the page's latest revision.
 505          * @param $firstInList Boolean: whether this row corresponds to the first displayed on this history page.
 506          * @return String: HTML output for the row
 507          */
 508         function historyLine( $row, $next, $notificationtimestamp = false,
 509                 $latest = false, $firstInList = false )
 510         {
 511                 $rev = new Revision( $row );
 512                 $rev->setTitle( $this->getTitle() );
 513
 514                 $curlink = $this->curLink( $rev, $latest );
 515                 $lastlink = $this->lastLink( $rev, $next );
 516                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 517                 $histLinks = Html::rawElement(
 518                                 'span',
 519                                 array( 'class' => 'mw-history-histlinks' ),
 520                                 '(' . $curlink . $this->historyPage->message['pipe-separator'] . $lastlink . ') '
 521                 );
 522                 $s = $histLinks . $diffButtons;
 523
 524                 $link = $this->revLink( $rev );
 525                 $classes = array();
 526
 527                 $del = '';
 528                 $user = $this->getUser();
 529                 // Show checkboxes for each revision
 530                 if ( $user->isAllowed( 'deleterevision' ) ) {
 531                         $this->preventClickjacking();
 532                         // If revision was hidden from sysops, disable the checkbox
 533                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 534                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 535                         // Otherwise, enable the checkbox...
 536                         } else {
 537                                 $del = Xml::check( 'showhiderevisions', false,
 538                                         array( 'name' => 'ids[' . $rev->getId() . ']' ) );
 539                         }
 540                 // User can only view deleted revisions...
 541                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 542                         // If revision was hidden from sysops, disable the link
 543                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 544                                 $cdel = Linker::revDeleteLinkDisabled( false );
 545                         // Otherwise, show the link...
 546                         } else {
 547                                 $query = array( 'type' => 'revision',
 548                                         'target' => $this->getTitle()->getPrefixedDbkey(), 'ids' => $rev->getId() );
 549                                 $del .= Linker::revDeleteLink( $query,
 550                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 551                         }
 552                 }
 553                 if ( $del ) {
 554                         $s .= " $del ";
 555                 }
 556
 557                 $lang = $this->getLang();
 558                 $dirmark = $lang->getDirMark();
 559
 560                 $s .= " $link";
 561                 $s .= $dirmark;
 562                 $s .= " <span class='history-user'>" .
 563                         Linker::revUserTools( $rev, true ) . "</span>";
 564                 $s .= $dirmark;
 565
 566                 if ( $rev->isMinor() ) {
 567                         $s .= ' ' . ChangesList::flag( 'minor' );
 568                 }
 569
 570                 if ( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 571                         $s .= ' ' . Linker::formatRevisionSize( $size );
 572                 }
 573
 574                 $s .= Linker::revComment( $rev, false, true );
 575
 576                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 577                         $s .= ' <span class="updatedmarker">' .  $this->msg( 'updatedmarker' )->escaped() . '</span>';
 578                 }
 579
 580                 $tools = array();
 581
 582                 # Rollback and undo links
 583                 if ( !is_null( $next ) && is_object( $next ) &&
 584                         !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) ) )
 585                 {
 586                         if ( $latest && !count( $this->getTitle()->getUserPermissionsErrors( 'rollback', $this->getUser() ) ) ) {
 587                                 $this->preventClickjacking();
 588                                 $tools[] = '<span class="mw-rollback-link">' .
 589                                         Linker::buildRollbackLink( $rev ) . '</span>';
 590                         }
 591
 592                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 593                                 && !$next->rev_deleted & Revision::DELETED_TEXT )
 594                         {
 595                                 # Create undo tooltip for the first (=latest) line only
 596                                 $undoTooltip = $latest
 597                                         ? array( 'title' => $this->msg( 'tooltip-undo' )->text() )
 598                                         : array();
 599                                 $undolink = Linker::linkKnown(
 600                                         $this->getTitle(),
 601                                         $this->msg( 'editundo' )->escaped(),
 602                                         $undoTooltip,
 603                                         array(
 604                                                 'action' => 'edit',
 605                                                 'undoafter' => $next->rev_id,
 606                                                 'undo' => $rev->getId()
 607                                         )
 608                                 );
 609                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 610                         }
 611                 }
 612
 613                 if ( $tools ) {
 614                         $s .= ' (' . $lang->pipeList( $tools ) . ')';
 615                 }
 616
 617                 # Tags
 618                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 619                 $classes = array_merge( $classes, $newClasses );
 620                 $s .= " $tagSummary";
 621
 622                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s, &$classes ) );
 623
 624                 $attribs = array();
 625                 if ( $classes ) {
 626                         $attribs['class'] = implode( ' ', $classes );
 627                 }
 628
 629                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 630         }
 631
 632         /**
 633          * Create a link to view this revision of the page
 634          *
 635          * @param $rev Revision
 636          * @return String
 637          */
 638         function revLink( $rev ) {
 639                 $date = $this->getLang()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 640                 $date = htmlspecialchars( $date );
 641                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 642                         $link = Linker::linkKnown(
 643                                 $this->getTitle(),
 644                                 $date,
 645                                 array(),
 646                                 array( 'oldid' => $rev->getId() )
 647                         );
 648                 } else {
 649                         $link = $date;
 650                 }
 651                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 652                         $link = "<span class=\"history-deleted\">$link</span>";
 653                 }
 654                 return $link;
 655         }
 656
 657         /**
 658          * Create a diff-to-current link for this revision for this page
 659          *
 660          * @param $rev Revision
 661          * @param $latest Boolean: this is the latest revision of the page?
 662          * @return String
 663          */
 664         function curLink( $rev, $latest ) {
 665                 $cur = $this->historyPage->message['cur'];
 666                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 667                         return $cur;
 668                 } else {
 669                         return Linker::linkKnown(
 670                                 $this->getTitle(),
 671                                 $cur,
 672                                 array(),
 673                                 array(
 674                                         'diff' => $this->getTitle()->getLatestRevID(),
 675                                         'oldid' => $rev->getId()
 676                                 )
 677                         );
 678                 }
 679         }
 680
 681         /**
 682          * Create a diff-to-previous link for this revision for this page.
 683          *
 684          * @param $prevRev Revision: the previous revision
 685          * @param $next Mixed: the newer revision
 686          * @return String
 687          */
 688         function lastLink( $prevRev, $next ) {
 689                 $last = $this->historyPage->message['last'];
 690                 # $next may either be a Row, null, or "unkown"
 691                 $nextRev = is_object( $next ) ? new Revision( $next ) : $next;
 692                 if ( is_null( $next ) ) {
 693                         # Probably no next row
 694                         return $last;
 695                 } elseif ( $next === 'unknown' ) {
 696                         # Next row probably exists but is unknown, use an oldid=prev link
 697                         return Linker::linkKnown(
 698                                 $this->getTitle(),
 699                                 $last,
 700                                 array(),
 701                                 array(
 702                                         'diff' => $prevRev->getId(),
 703                                         'oldid' => 'prev'
 704                                 )
 705                         );
 706                 } elseif ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 707                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() ) )
 708                 {
 709                         return $last;
 710                 } else {
 711                         return Linker::linkKnown(
 712                                 $this->getTitle(),
 713                                 $last,
 714                                 array(),
 715                                 array(
 716                                         'diff' => $prevRev->getId(),
 717                                         'oldid' => $next->rev_id
 718                                 )
 719                         );
 720                 }
 721         }
 722
 723         /**
 724          * Create radio buttons for page history
 725          *
 726          * @param $rev Revision object
 727          * @param $firstInList Boolean: is this version the first one?
 728          *
 729          * @return String: HTML output for the radio buttons
 730          */
 731         function diffButtons( $rev, $firstInList ) {
 732                 if ( $this->getNumRows() > 1 ) {
 733                         $id = $rev->getId();
 734                         $radio = array( 'type'  => 'radio', 'value' => $id );
 735                         /** @todo: move title texts to javascript */
 736                         if ( $firstInList ) {
 737                                 $first = Xml::element( 'input',
 738                                         array_merge( $radio, array(
 739                                                 'style' => 'visibility:hidden',
 740                                                 'name'  => 'oldid',
 741                                                 'id' => 'mw-oldid-null' ) )
 742                                 );
 743                                 $checkmark = array( 'checked' => 'checked' );
 744                         } else {
 745                                 # Check visibility of old revisions
 746                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 747                                         $radio['disabled'] = 'disabled';
 748                                         $checkmark = array(); // We will check the next possible one
 749                                 } elseif ( !$this->oldIdChecked ) {
 750                                         $checkmark = array( 'checked' => 'checked' );
 751                                         $this->oldIdChecked = $id;
 752                                 } else {
 753                                         $checkmark = array();
 754                                 }
 755                                 $first = Xml::element( 'input',
 756                                         array_merge( $radio, $checkmark, array(
 757                                                 'name'  => 'oldid',
 758                                                 'id' => "mw-oldid-$id" ) ) );
 759                                 $checkmark = array();
 760                         }
 761                         $second = Xml::element( 'input',
 762                                 array_merge( $radio, $checkmark, array(
 763                                         'name'  => 'diff',
 764                                         'id' => "mw-diff-$id" ) ) );
 765                         return $first . $second;
 766                 } else {
 767                         return '';
 768                 }
 769         }
 770
 771         /**
 772          * This is called if a write operation is possible from the generated HTML
 773          */
 774         function preventClickjacking( $enable = true ) {
 775                 $this->preventClickjacking = $enable;
 776         }
 777
 778         /**
 779          * Get the "prevent clickjacking" flag
 780          */
 781         function getPreventClickjacking() {
 782                 return $this->preventClickjacking;
 783         }
 784 }
 785
 786 /**
 787  * Backwards-compatibility alias
 788  */
 789 class HistoryPage extends HistoryAction {
 790         public function __construct( Page $article ) { # Just to make it public
 791                 parent::__construct( $article );
 792         }
 793
 794         public function history() {
 795                 $this->onView();
 796         }
 797 }