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