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  */
  24
  25 /**
  26  * This class handles printing the history page for an article.  In order to
  27  * be efficient, it uses timestamps rather than offsets for paging, to avoid
  28  * costly LIMIT,offset queries.
  29  *
  30  * Construct it by passing in an Article, and call $h->history() to print the
  31  * history.
  32  *
  33  */
  34 class HistoryAction extends FormlessAction {
  35         const DIR_PREV = 0;
  36         const DIR_NEXT = 1;
  37
  38         public function getName() {
  39                 return 'history';
  40         }
  41
  42         public function requiresWrite() {
  43                 return false;
  44         }
  45
  46         public function requiresUnblock() {
  47                 return false;
  48         }
  49
  50         protected function getPageTitle() {
  51                 return $this->msg( 'history-title', $this->getTitle()->getPrefixedText() )->text();
  52         }
  53
  54         protected function getDescription() {
  55                 // Creation of a subtitle link pointing to [[Special:Log]]
  56                 return Linker::linkKnown(
  57                         SpecialPage::getTitleFor( 'Log' ),
  58                         $this->msg( 'viewpagelogs' )->escaped(),
  59                         array(),
  60                         array( 'page' => $this->getTitle()->getPrefixedText() )
  61                 );
  62         }
  63
  64         /**
  65          * Get the Article object we are working on.
  66          * @return Page
  67          */
  68         public function getArticle() {
  69                 return $this->page;
  70         }
  71
  72         /**
  73          * As we use the same small set of messages in various methods and that
  74          * they are called often, we call them once and save them in $this->message
  75          */
  76         private function preCacheMessages() {
  77                 // Precache various messages
  78                 if ( !isset( $this->message ) ) {
  79                         $msgs = array( 'cur', 'last', 'pipe-separator' );
  80                         foreach ( $msgs as $msg ) {
  81                                 $this->message[$msg] = $this->msg( $msg )->escaped();
  82                         }
  83                 }
  84         }
  85
  86         /**
  87          * Print the history page for an article.
  88          */
  89         function onView() {
  90                 global $wgScript, $wgUseFileCache;
  91
  92                 $out = $this->getOutput();
  93                 $request = $this->getRequest();
  94
  95                 /**
  96                  * Allow client caching.
  97                  */
  98                 if ( $out->checkLastModified( $this->page->getTouched() ) ) {
  99                         return; // Client cache fresh and headers sent, nothing more to do.
 100                 }
 101
 102                 wfProfileIn( __METHOD__ );
 103
 104                 $this->preCacheMessages();
 105
 106                 # Fill in the file cache if not set already
 107                 if ( $wgUseFileCache && HTMLFileCache::useFileCache( $this->getContext() ) ) {
 108                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'history' );
 109                         if ( !$cache->isCacheGood( /* Assume up to date */ ) ) {
 110                                 ob_start( array( &$cache, 'saveToFileCache' ) );
 111                         }
 112                 }
 113
 114                 // Setup page variables.
 115                 $out->setFeedAppendQuery( 'action=history' );
 116                 $out->addModules( array( 'mediawiki.legacy.history', 'mediawiki.action.history' ) );
 117
 118                 // Handle atom/RSS feeds.
 119                 $feedType = $request->getVal( 'feed' );
 120                 if ( $feedType ) {
 121                         $this->feed( $feedType );
 122                         wfProfileOut( __METHOD__ );
 123                         return;
 124                 }
 125
 126                 // Fail nicely if article doesn't exist.
 127                 if ( !$this->page->exists() ) {
 128                         $out->addWikiMsg( 'nohistory' );
 129                         # show deletion/move log if there is an entry
 130                         LogEventsList::showLogExtract(
 131                                 $out,
 132                                 array( 'delete', 'move' ),
 133                                 $this->getTitle(),
 134                                 '',
 135                                 array(  'lim' => 10,
 136                                         'conds' => array( "log_action != 'revision'" ),
 137                                         'showIfEmpty' => false,
 138                                         'msgKey' => array( 'moveddeleted-notice' )
 139                                 )
 140                         );
 141                         wfProfileOut( __METHOD__ );
 142                         return;
 143                 }
 144
 145                 /**
 146                  * Add date selector to quickly get to a certain time
 147                  */
 148                 $year        = $request->getInt( 'year' );
 149                 $month       = $request->getInt( 'month' );
 150                 $tagFilter   = $request->getVal( 'tagfilter' );
 151                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 152
 153                 /**
 154                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 155                  */
 156                 if ( $request->getBool( 'deleted' ) ) {
 157                         $conds = array( "rev_deleted != '0'" );
 158                 } else {
 159                         $conds = array();
 160                 }
 161                 $checkDeleted = Xml::checkLabel( $this->msg( 'history-show-deleted' )->text(),
 162                         'deleted', 'mw-show-deleted-only', $request->getBool( 'deleted' ) ) . "\n";
 163
 164                 // Add the general form
 165                 $action = htmlspecialchars( $wgScript );
 166                 $out->addHTML(
 167                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 168                         Xml::fieldset(
 169                                 $this->msg( 'history-fieldset-title' )->text(),
 170                                 false,
 171                                 array( 'id' => 'mw-history-search' )
 172                         ) .
 173                         Html::hidden( 'title', $this->getTitle()->getPrefixedDBKey() ) . "\n" .
 174                         Html::hidden( 'action', 'history' ) . "\n" .
 175                         Xml::dateMenu( $year, $month ) . '&#160;' .
 176                         ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
 177                         $checkDeleted .
 178                         Xml::submitButton( $this->msg( 'allpagessubmit' )->text() ) . "\n" .
 179                         '</fieldset></form>'
 180                 );
 181
 182                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->page ) );
 183
 184                 // Create and output the list.
 185                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 186                 $out->addHTML(
 187                         $pager->getNavigationBar() .
 188                         $pager->getBody() .
 189                         $pager->getNavigationBar()
 190                 );
 191                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 192
 193                 wfProfileOut( __METHOD__ );
 194         }
 195
 196         /**
 197          * Fetch an array of revisions, specified by a given limit, offset and
 198          * direction. This is now only used by the feeds. It was previously
 199          * used by the main UI but that's now handled by the pager.
 200          *
 201          * @param $limit Integer: the limit number of revisions to get
 202          * @param $offset Integer
 203          * @param $direction Integer: either HistoryPage::DIR_PREV or HistoryPage::DIR_NEXT
 204          * @return ResultWrapper
 205          */
 206         function fetchRevisions( $limit, $offset, $direction ) {
 207                 // Fail if article doesn't exist.
 208                 if( !$this->getTitle()->exists() ) {
 209                         return new FakeResultWrapper( array() );
 210                 }
 211
 212                 $dbr = wfGetDB( DB_SLAVE );
 213
 214                 if ( $direction == HistoryPage::DIR_PREV ) {
 215                         list( $dirs, $oper ) = array( "ASC", ">=" );
 216                 } else { /* $direction == HistoryPage::DIR_NEXT */
 217                         list( $dirs, $oper ) = array( "DESC", "<=" );
 218                 }
 219
 220                 if ( $offset ) {
 221                         $offsets = array( "rev_timestamp $oper '$offset'" );
 222                 } else {
 223                         $offsets = array();
 224                 }
 225
 226                 $page_id = $this->page->getId();
 227
 228                 return $dbr->select( 'revision',
 229                         Revision::selectFields(),
 230                         array_merge( array( "rev_page=$page_id" ), $offsets ),
 231                         __METHOD__,
 232                         array( 'ORDER BY' => "rev_timestamp $dirs",
 233                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit )
 234                 );
 235         }
 236
 237         /**
 238          * Output a subscription feed listing recent edits to this page.
 239          *
 240          * @param $type String: feed type
 241          */
 242         function feed( $type ) {
 243                 global $wgFeedClasses, $wgFeedLimit;
 244                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 245                         return;
 246                 }
 247                 $request = $this->getRequest();
 248
 249                 $feed = new $wgFeedClasses[$type](
 250                         $this->getTitle()->getPrefixedText() . ' - ' .
 251                         $this->msg( 'history-feed-title' )->inContentLanguage()->text(),
 252                         $this->msg( 'history-feed-description' )->inContentLanguage()->text(),
 253                         $this->getTitle()->getFullUrl( 'action=history' )
 254                 );
 255
 256                 // Get a limit on number of feed entries. Provide a sane default
 257                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 258                 $limit = $request->getInt( 'limit', 10 );
 259                 if ( $limit > $wgFeedLimit || $limit < 1 ) {
 260                         $limit = 10;
 261                 }
 262                 $items = $this->fetchRevisions( $limit, 0, HistoryPage::DIR_NEXT );
 263
 264                 // Generate feed elements enclosed between header and footer.
 265                 $feed->outHeader();
 266                 if ( $items->numRows() ) {
 267                         foreach ( $items as $row ) {
 268                                 $feed->outItem( $this->feedItem( $row ) );
 269                         }
 270                 } else {
 271                         $feed->outItem( $this->feedEmpty() );
 272                 }
 273                 $feed->outFooter();
 274         }
 275
 276         function feedEmpty() {
 277                 return new FeedItem(
 278                         $this->msg( 'nohistory' )->inContentLanguage()->text(),
 279                         $this->msg( 'history-feed-empty' )->inContentLanguage()->parseAsBlock(),
 280                         $this->getTitle()->getFullUrl(),
 281                         wfTimestamp( TS_MW ),
 282                         '',
 283                         $this->getTitle()->getTalkPage()->getFullUrl()
 284                 );
 285         }
 286
 287         /**
 288          * Generate a FeedItem object from a given revision table row
 289          * Borrows Recent Changes' feed generation functions for formatting;
 290          * includes a diff to the previous revision (if any).
 291          *
 292          * @param $row Object: database row
 293          * @return FeedItem
 294          */
 295         function feedItem( $row ) {
 296                 $rev = new Revision( $row );
 297                 $rev->setTitle( $this->getTitle() );
 298                 $text = FeedUtils::formatDiffRow(
 299                         $this->getTitle(),
 300                         $this->getTitle()->getPreviousRevisionID( $rev->getId() ),
 301                         $rev->getId(),
 302                         $rev->getTimestamp(),
 303                         $rev->getComment()
 304                 );
 305                 if ( $rev->getComment() == '' ) {
 306                         global $wgContLang;
 307                         $title = $this->msg( 'history-feed-item-nocomment',
 308                                 $rev->getUserText(),
 309                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 310                                 $wgContLang->date( $rev->getTimestamp() ),
 311                                 $wgContLang->time( $rev->getTimestamp() ) )->inContentLanguage()->text();
 312                 } else {
 313                         $title = $rev->getUserText() .
 314                         $this->msg( 'colon-separator' )->inContentLanguage()->text() .
 315                         FeedItem::stripComment( $rev->getComment() );
 316                 }
 317                 return new FeedItem(
 318                         $title,
 319                         $text,
 320                         $this->getTitle()->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 321                         $rev->getTimestamp(),
 322                         $rev->getUserText(),
 323                         $this->getTitle()->getTalkPage()->getFullUrl()
 324                 );
 325         }
 326 }
 327
 328 /**
 329  * @ingroup Pager
 330  */
 331 class HistoryPager extends ReverseChronologicalPager {
 332         public $lastRow = false, $counter, $historyPage, $buttons, $conds;
 333         protected $oldIdChecked;
 334         protected $preventClickjacking = false;
 335         /**
 336          * @var array
 337          */
 338         protected $parentLens;
 339
 340         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
 341                 parent::__construct( $historyPage->getContext() );
 342                 $this->historyPage = $historyPage;
 343                 $this->tagFilter = $tagFilter;
 344                 $this->getDateCond( $year, $month );
 345                 $this->conds = $conds;
 346         }
 347
 348         // For hook compatibility...
 349         function getArticle() {
 350                 return $this->historyPage->getArticle();
 351         }
 352
 353         function getSqlComment() {
 354                 if ( $this->conds ) {
 355                         return 'history page filtered'; // potentially slow, see CR r58153
 356                 } else {
 357                         return 'history page unfiltered';
 358                 }
 359         }
 360
 361         function getQueryInfo() {
 362                 $queryInfo = array(
 363                         'tables'  => array( 'revision', 'user' ),
 364                         'fields'  => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 365                         'conds'   => array_merge(
 366                                 array( 'rev_page' => $this->getWikiPage()->getId() ),
 367                                 $this->conds ),
 368                         'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
 369                         'join_conds' => array(
 370                                 'user'        => Revision::userJoinCond(),
 371                                 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
 372                 );
 373                 ChangeTags::modifyDisplayQuery(
 374                         $queryInfo['tables'],
 375                         $queryInfo['fields'],
 376                         $queryInfo['conds'],
 377                         $queryInfo['join_conds'],
 378                         $queryInfo['options'],
 379                         $this->tagFilter
 380                 );
 381                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 382                 return $queryInfo;
 383         }
 384
 385         function getIndexField() {
 386                 return 'rev_timestamp';
 387         }
 388
 389         function formatRow( $row ) {
 390                 if ( $this->lastRow ) {
 391                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 392                         $firstInList = $this->counter == 1;
 393                         $this->counter++;
 394                         $s = $this->historyLine( $this->lastRow, $row,
 395                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 396                 } else {
 397                         $s = '';
 398                 }
 399                 $this->lastRow = $row;
 400                 return $s;
 401         }
 402
 403         function doBatchLookups() {
 404                 # Do a link batch query
 405                 $this->mResult->seek( 0 );
 406                 $batch = new LinkBatch();
 407                 $revIds = array();
 408                 foreach ( $this->mResult as $row ) {
 409                         if( $row->rev_parent_id ) {
 410                                 $revIds[] = $row->rev_parent_id;
 411                         }
 412                         if( !is_null( $row->user_name ) ) {
 413                                 $batch->add( NS_USER, $row->user_name );
 414                                 $batch->add( NS_USER_TALK, $row->user_name );
 415                         } else { # for anons or usernames of imported revisions
 416                                 $batch->add( NS_USER, $row->rev_user_text );
 417                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 418                         }
 419                 }
 420                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 421                 $batch->execute();
 422                 $this->mResult->seek( 0 );
 423         }
 424
 425         /**
 426          * Creates begin of history list with a submit button
 427          *
 428          * @return string HTML output
 429          */
 430         function getStartBody() {
 431                 global $wgScript;
 432                 $this->lastRow = false;
 433                 $this->counter = 1;
 434                 $this->oldIdChecked = 0;
 435
 436                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 437                 $s = Html::openElement( 'form', array( 'action' => $wgScript,
 438                         'id' => 'mw-history-compare' ) ) . "\n";
 439                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDbKey() ) . "\n";
 440                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 441
 442                 // Button container stored in $this->buttons for re-use in getEndBody()
 443                 $this->buttons = '<div>';
 444                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 445                         array( 'class' => 'historysubmit mw-history-compareselectedversions-button' )
 446                                 + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' )
 447                 ) . "\n";
 448
 449                 if ( $this->getUser()->isAllowed( 'deleterevision' ) ) {
 450                         $this->buttons .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 451                 }
 452                 $this->buttons .= '</div>';
 453
 454                 $s .= $this->buttons;
 455                 $s .= '<ul id="pagehistory">' . "\n";
 456                 return $s;
 457         }
 458
 459         private function getRevisionButton( $name, $msg ) {
 460                 $this->preventClickjacking();
 461                 # Note bug #20966, <button> is non-standard in IE<8
 462                 $element = Html::element( 'button',
 463                         array(
 464                                 'type' => 'submit',
 465                                 'name' => $name,
 466                                 'value' => '1',
 467                                 'class' => "historysubmit mw-history-$name-button",
 468                         ),
 469                         $this->msg( $msg )->text()
 470                 ) . "\n";
 471                 return $element;
 472         }
 473
 474         function getEndBody() {
 475                 if ( $this->lastRow ) {
 476                         $latest = $this->counter == 1 && $this->mIsFirst;
 477                         $firstInList = $this->counter == 1;
 478                         if ( $this->mIsBackwards ) {
 479                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 480                                 if ( $this->mOffset == '' ) {
 481                                         $next = null;
 482                                 } else {
 483                                         $next = 'unknown';
 484                                 }
 485                         } else {
 486                                 # The next row is the past-the-end row
 487                                 $next = $this->mPastTheEndRow;
 488                         }
 489                         $this->counter++;
 490                         $s = $this->historyLine( $this->lastRow, $next,
 491                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 492                 } else {
 493                         $s = '';
 494                 }
 495                 $s .= "</ul>\n";
 496                 # Add second buttons only if there is more than one rev
 497                 if ( $this->getNumRows() > 2 ) {
 498                         $s .= $this->buttons;
 499                 }
 500                 $s .= '</form>';
 501                 return $s;
 502         }
 503
 504         /**
 505          * Creates a submit button
 506          *
 507          * @param $message String: text of the submit button, will be escaped
 508          * @param $attributes Array: attributes
 509          * @return String: HTML output for the submit button
 510          */
 511         function submitButton( $message, $attributes = array() ) {
 512                 # Disable submit button if history has 1 revision only
 513                 if ( $this->getNumRows() > 1 ) {
 514                         return Xml::submitButton( $message , $attributes );
 515                 } else {
 516                         return '';
 517                 }
 518         }
 519
 520         /**
 521          * Returns a row from the history printout.
 522          *
 523          * @todo document some more, and maybe clean up the code (some params redundant?)
 524          *
 525          * @param $row Object: the database row corresponding to the previous line.
 526          * @param $next Mixed: the database row corresponding to the next line. (chronologically previous)
 527          * @param $notificationtimestamp
 528          * @param $latest Boolean: whether this row corresponds to the page's latest revision.
 529          * @param $firstInList Boolean: whether this row corresponds to the first displayed on this history page.
 530          * @return String: HTML output for the row
 531          */
 532         function historyLine( $row, $next, $notificationtimestamp = false,
 533                 $latest = false, $firstInList = false )
 534         {
 535                 $rev = new Revision( $row );
 536                 $rev->setTitle( $this->getTitle() );
 537
 538                 if ( is_object( $next ) ) {
 539                         $prevRev = new Revision( $next );
 540                         $prevRev->setTitle( $this->getTitle() );
 541                 } else {
 542                         $prevRev = null;
 543                 }
 544
 545                 $curlink = $this->curLink( $rev, $latest );
 546                 $lastlink = $this->lastLink( $rev, $next );
 547                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 548                 $histLinks = Html::rawElement(
 549                                 'span',
 550                                 array( 'class' => 'mw-history-histlinks' ),
 551                                 $this->msg( 'parentheses' )->rawParams( $curlink . $this->historyPage->message['pipe-separator'] . $lastlink )->escaped()
 552                 );
 553                 $s = $histLinks . $diffButtons;
 554
 555                 $link = $this->revLink( $rev );
 556                 $classes = array();
 557
 558                 $del = '';
 559                 $user = $this->getUser();
 560                 // Show checkboxes for each revision
 561                 if ( $user->isAllowed( 'deleterevision' ) ) {
 562                         $this->preventClickjacking();
 563                         // If revision was hidden from sysops, disable the checkbox
 564                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 565                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 566                         // Otherwise, enable the checkbox...
 567                         } else {
 568                                 $del = Xml::check( 'showhiderevisions', false,
 569                                         array( 'name' => 'ids[' . $rev->getId() . ']' ) );
 570                         }
 571                 // User can only view deleted revisions...
 572                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 573                         // If revision was hidden from sysops, disable the link
 574                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 575                                 $cdel = Linker::revDeleteLinkDisabled( false );
 576                         // Otherwise, show the link...
 577                         } else {
 578                                 $query = array( 'type' => 'revision',
 579                                         'target' => $this->getTitle()->getPrefixedDbkey(), 'ids' => $rev->getId() );
 580                                 $del .= Linker::revDeleteLink( $query,
 581                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 582                         }
 583                 }
 584                 if ( $del ) {
 585                         $s .= " $del ";
 586                 }
 587
 588                 $lang = $this->getLanguage();
 589                 $dirmark = $lang->getDirMark();
 590
 591                 $s .= " $link";
 592                 $s .= $dirmark;
 593                 $s .= " <span class='history-user'>" .
 594                         Linker::revUserTools( $rev, true ) . "</span>";
 595                 $s .= $dirmark;
 596
 597                 if ( $rev->isMinor() ) {
 598                         $s .= ' ' . ChangesList::flag( 'minor' );
 599                 }
 600
 601                 # Size is always public data
 602                 $prevSize = isset( $this->parentLens[$row->rev_parent_id] )
 603                         ? $this->parentLens[$row->rev_parent_id]
 604                         : 0;
 605                 $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 606                 $fSize = Linker::formatRevisionSize($rev->getSize());
 607                 $s .= " . . $fSize $sDiff";
 608
 609                 # Text following the character difference is added just before running hooks
 610                 $s2 = Linker::revComment( $rev, false, true );
 611
 612                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 613                         $s2 .= ' <span class="updatedmarker">' .  $this->msg( 'updatedmarker' )->escaped() . '</span>';
 614                         $classes[] = 'mw-history-line-updated';
 615                 }
 616
 617                 $tools = array();
 618
 619                 # Rollback and undo links
 620                 if ( $prevRev && $this->getTitle()->quickUserCan( 'edit', $user ) ) {
 621                         if ( $latest && $this->getTitle()->quickUserCan( 'rollback', $user ) ) {
 622                                 $this->preventClickjacking();
 623                                 $tools[] = '<span class="mw-rollback-link">' .
 624                                         Linker::buildRollbackLink( $rev, $this->getContext() ) . '</span>';
 625                         }
 626
 627                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 628                                 && !$prevRev->isDeleted( Revision::DELETED_TEXT ) )
 629                         {
 630                                 # Create undo tooltip for the first (=latest) line only
 631                                 $undoTooltip = $latest
 632                                         ? array( 'title' => $this->msg( 'tooltip-undo' )->text() )
 633                                         : array();
 634                                 $undolink = Linker::linkKnown(
 635                                         $this->getTitle(),
 636                                         $this->msg( 'editundo' )->escaped(),
 637                                         $undoTooltip,
 638                                         array(
 639                                                 'action'    => 'edit',
 640                                                 'undoafter' => $prevRev->getId(),
 641                                                 'undo'      => $rev->getId()
 642                                         )
 643                                 );
 644                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 645                         }
 646                 }
 647
 648                 if ( $tools ) {
 649                         $s2 .= ' '. $this->msg( 'parentheses' )->rawParams( $lang->pipeList( $tools ) )->escaped();
 650                 }
 651
 652                 # Tags
 653                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 654                 $classes = array_merge( $classes, $newClasses );
 655                 if ( $tagSummary !== '' ) {
 656                         $s2 .= " $tagSummary";
 657                 }
 658
 659                 # Include separator between character difference and following text
 660                 if ( $s2 !== '' ) {
 661                         $s .= " . . $s2";
 662                 }
 663
 664                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s, &$classes ) );
 665
 666                 $attribs = array();
 667                 if ( $classes ) {
 668                         $attribs['class'] = implode( ' ', $classes );
 669                 }
 670
 671                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 672         }
 673
 674         /**
 675          * Create a link to view this revision of the page
 676          *
 677          * @param $rev Revision
 678          * @return String
 679          */
 680         function revLink( $rev ) {
 681                 $date = $this->getLanguage()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 682                 $date = htmlspecialchars( $date );
 683                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 684                         $link = Linker::linkKnown(
 685                                 $this->getTitle(),
 686                                 $date,
 687                                 array(),
 688                                 array( 'oldid' => $rev->getId() )
 689                         );
 690                 } else {
 691                         $link = $date;
 692                 }
 693                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 694                         $link = "<span class=\"history-deleted\">$link</span>";
 695                 }
 696                 return $link;
 697         }
 698
 699         /**
 700          * Create a diff-to-current link for this revision for this page
 701          *
 702          * @param $rev Revision
 703          * @param $latest Boolean: this is the latest revision of the page?
 704          * @return String
 705          */
 706         function curLink( $rev, $latest ) {
 707                 $cur = $this->historyPage->message['cur'];
 708                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 709                         return $cur;
 710                 } else {
 711                         return Linker::linkKnown(
 712                                 $this->getTitle(),
 713                                 $cur,
 714                                 array(),
 715                                 array(
 716                                         'diff' => $this->getWikiPage()->getLatest(),
 717                                         'oldid' => $rev->getId()
 718                                 )
 719                         );
 720                 }
 721         }
 722
 723         /**
 724          * Create a diff-to-previous link for this revision for this page.
 725          *
 726          * @param $prevRev Revision: the previous revision
 727          * @param $next Mixed: the newer revision
 728          * @return String
 729          */
 730         function lastLink( $prevRev, $next ) {
 731                 $last = $this->historyPage->message['last'];
 732                 # $next may either be a Row, null, or "unkown"
 733                 $nextRev = is_object( $next ) ? new Revision( $next ) : $next;
 734                 if ( is_null( $next ) ) {
 735                         # Probably no next row
 736                         return $last;
 737                 } elseif ( $next === 'unknown' ) {
 738                         # Next row probably exists but is unknown, use an oldid=prev link
 739                         return Linker::linkKnown(
 740                                 $this->getTitle(),
 741                                 $last,
 742                                 array(),
 743                                 array(
 744                                         'diff' => $prevRev->getId(),
 745                                         'oldid' => 'prev'
 746                                 )
 747                         );
 748                 } elseif ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 749                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() ) )
 750                 {
 751                         return $last;
 752                 } else {
 753                         return Linker::linkKnown(
 754                                 $this->getTitle(),
 755                                 $last,
 756                                 array(),
 757                                 array(
 758                                         'diff' => $prevRev->getId(),
 759                                         'oldid' => $next->rev_id
 760                                 )
 761                         );
 762                 }
 763         }
 764
 765         /**
 766          * Create radio buttons for page history
 767          *
 768          * @param $rev Revision object
 769          * @param $firstInList Boolean: is this version the first one?
 770          *
 771          * @return String: HTML output for the radio buttons
 772          */
 773         function diffButtons( $rev, $firstInList ) {
 774                 if ( $this->getNumRows() > 1 ) {
 775                         $id = $rev->getId();
 776                         $radio = array( 'type'  => 'radio', 'value' => $id );
 777                         /** @todo: move title texts to javascript */
 778                         if ( $firstInList ) {
 779                                 $first = Xml::element( 'input',
 780                                         array_merge( $radio, array(
 781                                                 'style' => 'visibility:hidden',
 782                                                 'name'  => 'oldid',
 783                                                 'id' => 'mw-oldid-null' ) )
 784                                 );
 785                                 $checkmark = array( 'checked' => 'checked' );
 786                         } else {
 787                                 # Check visibility of old revisions
 788                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 789                                         $radio['disabled'] = 'disabled';
 790                                         $checkmark = array(); // We will check the next possible one
 791                                 } elseif ( !$this->oldIdChecked ) {
 792                                         $checkmark = array( 'checked' => 'checked' );
 793                                         $this->oldIdChecked = $id;
 794                                 } else {
 795                                         $checkmark = array();
 796                                 }
 797                                 $first = Xml::element( 'input',
 798                                         array_merge( $radio, $checkmark, array(
 799                                                 'name'  => 'oldid',
 800                                                 'id' => "mw-oldid-$id" ) ) );
 801                                 $checkmark = array();
 802                         }
 803                         $second = Xml::element( 'input',
 804                                 array_merge( $radio, $checkmark, array(
 805                                         'name'  => 'diff',
 806                                         'id' => "mw-diff-$id" ) ) );
 807                         return $first . $second;
 808                 } else {
 809                         return '';
 810                 }
 811         }
 812
 813         /**
 814          * This is called if a write operation is possible from the generated HTML
 815          */
 816         function preventClickjacking( $enable = true ) {
 817                 $this->preventClickjacking = $enable;
 818         }
 819
 820         /**
 821          * Get the "prevent clickjacking" flag
 822          * @return bool
 823          */
 824         function getPreventClickjacking() {
 825                 return $this->preventClickjacking;
 826         }
 827 }
 828
 829 /**
 830  * Backwards-compatibility alias
 831  */
 832 class HistoryPage extends HistoryAction {
 833         public function __construct( Page $article ) { # Just to make it public
 834                 parent::__construct( $article );
 835         }
 836
 837         public function history() {
 838                 $this->onView();
 839         }
 840 }