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