includes/actions/HistoryAction.php

   1 <?php
   2 /**
   3  * Page history
   4  *
   5  * Split off from Article.php and Skin.php, 2003-12-22
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  * @ingroup Actions
  24  */
  25
  26 /**
  27  * This class handles printing the history page for an article. In order to
  28  * be efficient, it uses timestamps rather than offsets for paging, to avoid
  29  * costly LIMIT,offset queries.
  30  *
  31  * Construct it by passing in an Article, and call $h->history() to print the
  32  * history.
  33  *
  34  * @ingroup Actions
  35  */
  36 class HistoryAction extends FormlessAction {
  37         const DIR_PREV = 0;
  38         const DIR_NEXT = 1;
  39
  40         /** @var array Array of message keys and strings */
  41         public $message;
  42
  43         public function getName() {
  44                 return 'history';
  45         }
  46
  47         public function requiresWrite() {
  48                 return false;
  49         }
  50
  51         public function requiresUnblock() {
  52                 return false;
  53         }
  54
  55         protected function getPageTitle() {
  56                 return $this->msg( 'history-title', $this->getTitle()->getPrefixedText() )->text();
  57         }
  58
  59         protected function getDescription() {
  60                 // Creation of a subtitle link pointing to [[Special:Log]]
  61                 return Linker::linkKnown(
  62                         SpecialPage::getTitleFor( 'Log' ),
  63                         $this->msg( 'viewpagelogs' )->escaped(),
  64                         array(),
  65                         array( 'page' => $this->getTitle()->getPrefixedText() )
  66                 );
  67         }
  68
  69         /**
  70          * Get the Article object we are working on.
  71          * @return Page
  72          */
  73         public function getArticle() {
  74                 return $this->page;
  75         }
  76
  77         /**
  78          * As we use the same small set of messages in various methods and that
  79          * they are called often, we call them once and save them in $this->message
  80          */
  81         private function preCacheMessages() {
  82                 // Precache various messages
  83                 if ( !isset( $this->message ) ) {
  84                         $msgs = array( 'cur', 'last', 'pipe-separator' );
  85                         foreach ( $msgs as $msg ) {
  86                                 $this->message[$msg] = $this->msg( $msg )->escaped();
  87                         }
  88                 }
  89         }
  90
  91         /**
  92          * Print the history page for an article.
  93          */
  94         function onView() {
  95                 $out = $this->getOutput();
  96                 $request = $this->getRequest();
  97
  98                 /**
  99                  * Allow client caching.
 100                  */
 101                 if ( $out->checkLastModified( $this->page->getTouched() ) ) {
 102                         return; // Client cache fresh and headers sent, nothing more to do.
 103                 }
 104
 105                 wfProfileIn( __METHOD__ );
 106
 107                 $this->preCacheMessages();
 108
 109                 # Fill in the file cache if not set already
 110                 $useFileCache = $this->context->getConfig()->get( 'UseFileCache' );
 111                 if ( $useFileCache && HTMLFileCache::useFileCache( $this->getContext() ) ) {
 112                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'history' );
 113                         if ( !$cache->isCacheGood( /* Assume up to date */ ) ) {
 114                                 ob_start( array( &$cache, 'saveToFileCache' ) );
 115                         }
 116                 }
 117
 118                 // Setup page variables.
 119                 $out->setFeedAppendQuery( 'action=history' );
 120                 $out->addModules( 'mediawiki.action.history' );
 121
 122                 // Handle atom/RSS feeds.
 123                 $feedType = $request->getVal( 'feed' );
 124                 if ( $feedType ) {
 125                         $this->feed( $feedType );
 126                         wfProfileOut( __METHOD__ );
 127
 128                         return;
 129                 }
 130
 131                 // Fail nicely if article doesn't exist.
 132                 if ( !$this->page->exists() ) {
 133                         $out->addWikiMsg( 'nohistory' );
 134                         # show deletion/move log if there is an entry
 135                         LogEventsList::showLogExtract(
 136                                 $out,
 137                                 array( 'delete', 'move' ),
 138                                 $this->getTitle(),
 139                                 '',
 140                                 array( 'lim' => 10,
 141                                         'conds' => array( "log_action != 'revision'" ),
 142                                         'showIfEmpty' => false,
 143                                         'msgKey' => array( 'moveddeleted-notice' )
 144                                 )
 145                         );
 146                         wfProfileOut( __METHOD__ );
 147
 148                         return;
 149                 }
 150
 151                 /**
 152                  * Add date selector to quickly get to a certain time
 153                  */
 154                 $year = $request->getInt( 'year' );
 155                 $month = $request->getInt( 'month' );
 156                 $tagFilter = $request->getVal( 'tagfilter' );
 157                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 158
 159                 /**
 160                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 161                  */
 162                 if ( $request->getBool( 'deleted' ) ) {
 163                         $conds = array( 'rev_deleted != 0' );
 164                 } else {
 165                         $conds = array();
 166                 }
 167                 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
 168                         $checkDeleted = Xml::checkLabel( $this->msg( 'history-show-deleted' )->text(),
 169                                 'deleted', 'mw-show-deleted-only', $request->getBool( 'deleted' ) ) . "\n";
 170                 } else {
 171                         $checkDeleted = '';
 172                 }
 173
 174                 // Add the general form
 175                 $action = htmlspecialchars( wfScript() );
 176                 $out->addHTML(
 177                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 178                         Xml::fieldset(
 179                                 $this->msg( 'history-fieldset-title' )->text(),
 180                                 false,
 181                                 array( 'id' => 'mw-history-search' )
 182                         ) .
 183                         Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n" .
 184                         Html::hidden( 'action', 'history' ) . "\n" .
 185                         Xml::dateMenu(
 186                                 ( $year == null ? MWTimestamp::getLocalInstance()->format( 'Y' ) : $year ),
 187                                 $month
 188                         ) . '&#160;' .
 189                         ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
 190                         $checkDeleted .
 191                         Xml::submitButton( $this->msg( 'allpagessubmit' )->text() ) . "\n" .
 192                         '</fieldset></form>'
 193                 );
 194
 195                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->page, $this->getContext() ) );
 196
 197                 // Create and output the list.
 198                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 199                 $out->addHTML(
 200                         $pager->getNavigationBar() .
 201                         $pager->getBody() .
 202                         $pager->getNavigationBar()
 203                 );
 204                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 205
 206                 wfProfileOut( __METHOD__ );
 207         }
 208
 209         /**
 210          * Fetch an array of revisions, specified by a given limit, offset and
 211          * direction. This is now only used by the feeds. It was previously
 212          * used by the main UI but that's now handled by the pager.
 213          *
 214          * @param int $limit The limit number of revisions to get
 215          * @param int $offset
 216          * @param int $direction Either self::DIR_PREV or self::DIR_NEXT
 217          * @return ResultWrapper
 218          */
 219         function fetchRevisions( $limit, $offset, $direction ) {
 220                 // Fail if article doesn't exist.
 221                 if ( !$this->getTitle()->exists() ) {
 222                         return new FakeResultWrapper( array() );
 223                 }
 224
 225                 $dbr = wfGetDB( DB_SLAVE );
 226
 227                 if ( $direction === self::DIR_PREV ) {
 228                         list( $dirs, $oper ) = array( "ASC", ">=" );
 229                 } else { /* $direction === self::DIR_NEXT */
 230                         list( $dirs, $oper ) = array( "DESC", "<=" );
 231                 }
 232
 233                 if ( $offset ) {
 234                         $offsets = array( "rev_timestamp $oper " . $dbr->addQuotes( $dbr->timestamp( $offset ) ) );
 235                 } else {
 236                         $offsets = array();
 237                 }
 238
 239                 $page_id = $this->page->getId();
 240
 241                 return $dbr->select( 'revision',
 242                         Revision::selectFields(),
 243                         array_merge( array( 'rev_page' => $page_id ), $offsets ),
 244                         __METHOD__,
 245                         array( 'ORDER BY' => "rev_timestamp $dirs",
 246                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit )
 247                 );
 248         }
 249
 250         /**
 251          * Output a subscription feed listing recent edits to this page.
 252          *
 253          * @param string $type Feed type
 254          */
 255         function feed( $type ) {
 256                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 257                         return;
 258                 }
 259                 $request = $this->getRequest();
 260
 261                 $feedClasses = $this->context->getConfig()->get( 'FeedClasses' );
 262                 /** @var RSSFeed|AtomFeed $feed */
 263                 $feed = new $feedClasses[$type](
 264                         $this->getTitle()->getPrefixedText() . ' - ' .
 265                         $this->msg( 'history-feed-title' )->inContentLanguage()->text(),
 266                         $this->msg( 'history-feed-description' )->inContentLanguage()->text(),
 267                         $this->getTitle()->getFullURL( 'action=history' )
 268                 );
 269
 270                 // Get a limit on number of feed entries. Provide a sane default
 271                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 272                 $limit = $request->getInt( 'limit', 10 );
 273                 $limit = min(
 274                         max( $limit, 1 ),
 275                         $this->context->getConfig()->get( 'FeedLimit' )
 276                 );
 277
 278                 $items = $this->fetchRevisions( $limit, 0, self::DIR_NEXT );
 279
 280                 // Generate feed elements enclosed between header and footer.
 281                 $feed->outHeader();
 282                 if ( $items->numRows() ) {
 283                         foreach ( $items as $row ) {
 284                                 $feed->outItem( $this->feedItem( $row ) );
 285                         }
 286                 } else {
 287                         $feed->outItem( $this->feedEmpty() );
 288                 }
 289                 $feed->outFooter();
 290         }
 291
 292         function feedEmpty() {
 293                 return new FeedItem(
 294                         $this->msg( 'nohistory' )->inContentLanguage()->text(),
 295                         $this->msg( 'history-feed-empty' )->inContentLanguage()->parseAsBlock(),
 296                         $this->getTitle()->getFullURL(),
 297                         wfTimestamp( TS_MW ),
 298                         '',
 299                         $this->getTitle()->getTalkPage()->getFullURL()
 300                 );
 301         }
 302
 303         /**
 304          * Generate a FeedItem object from a given revision table row
 305          * Borrows Recent Changes' feed generation functions for formatting;
 306          * includes a diff to the previous revision (if any).
 307          *
 308          * @param stdClass|array $row Database row
 309          * @return FeedItem
 310          */
 311         function feedItem( $row ) {
 312                 $rev = new Revision( $row );
 313                 $rev->setTitle( $this->getTitle() );
 314                 $text = FeedUtils::formatDiffRow(
 315                         $this->getTitle(),
 316                         $this->getTitle()->getPreviousRevisionID( $rev->getId() ),
 317                         $rev->getId(),
 318                         $rev->getTimestamp(),
 319                         $rev->getComment()
 320                 );
 321                 if ( $rev->getComment() == '' ) {
 322                         global $wgContLang;
 323                         $title = $this->msg( 'history-feed-item-nocomment',
 324                                 $rev->getUserText(),
 325                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 326                                 $wgContLang->date( $rev->getTimestamp() ),
 327                                 $wgContLang->time( $rev->getTimestamp() ) )->inContentLanguage()->text();
 328                 } else {
 329                         $title = $rev->getUserText() .
 330                                 $this->msg( 'colon-separator' )->inContentLanguage()->text() .
 331                                 FeedItem::stripComment( $rev->getComment() );
 332                 }
 333
 334                 return new FeedItem(
 335                         $title,
 336                         $text,
 337                         $this->getTitle()->getFullURL( 'diff=' . $rev->getId() . '&oldid=prev' ),
 338                         $rev->getTimestamp(),
 339                         $rev->getUserText(),
 340                         $this->getTitle()->getTalkPage()->getFullURL()
 341                 );
 342         }
 343 }
 344
 345 /**
 346  * @ingroup Pager
 347  * @ingroup Actions
 348  */
 349 class HistoryPager extends ReverseChronologicalPager {
 350         /**
 351          * @var bool|stdClass
 352          */
 353         public $lastRow = false;
 354
 355         public $counter, $historyPage, $buttons, $conds;
 356
 357         protected $oldIdChecked;
 358
 359         protected $preventClickjacking = false;
 360         /**
 361          * @var array
 362          */
 363         protected $parentLens;
 364
 365         /**
 366          * @param HistoryAction $historyPage
 367          * @param string $year
 368          * @param string $month
 369          * @param string $tagFilter
 370          * @param array $conds
 371          */
 372         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
 373                 parent::__construct( $historyPage->getContext() );
 374                 $this->historyPage = $historyPage;
 375                 $this->tagFilter = $tagFilter;
 376                 $this->getDateCond( $year, $month );
 377                 $this->conds = $conds;
 378         }
 379
 380         // For hook compatibility...
 381         function getArticle() {
 382                 return $this->historyPage->getArticle();
 383         }
 384
 385         function getSqlComment() {
 386                 if ( $this->conds ) {
 387                         return 'history page filtered'; // potentially slow, see CR r58153
 388                 } else {
 389                         return 'history page unfiltered';
 390                 }
 391         }
 392
 393         function getQueryInfo() {
 394                 $queryInfo = array(
 395                         'tables' => array( 'revision', 'user' ),
 396                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 397                         'conds' => array_merge(
 398                                 array( 'rev_page' => $this->getWikiPage()->getId() ),
 399                                 $this->conds ),
 400                         'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
 401                         'join_conds' => array( 'user' => Revision::userJoinCond() ),
 402                 );
 403                 ChangeTags::modifyDisplayQuery(
 404                         $queryInfo['tables'],
 405                         $queryInfo['fields'],
 406                         $queryInfo['conds'],
 407                         $queryInfo['join_conds'],
 408                         $queryInfo['options'],
 409                         $this->tagFilter
 410                 );
 411                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 412
 413                 return $queryInfo;
 414         }
 415
 416         function getIndexField() {
 417                 return 'rev_timestamp';
 418         }
 419
 420         /**
 421          * @param stdClass $row
 422          * @return string
 423          */
 424         function formatRow( $row ) {
 425                 if ( $this->lastRow ) {
 426                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 427                         $firstInList = $this->counter == 1;
 428                         $this->counter++;
 429                         $s = $this->historyLine( $this->lastRow, $row,
 430                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 431                 } else {
 432                         $s = '';
 433                 }
 434                 $this->lastRow = $row;
 435
 436                 return $s;
 437         }
 438
 439         function doBatchLookups() {
 440                 # Do a link batch query
 441                 $this->mResult->seek( 0 );
 442                 $batch = new LinkBatch();
 443                 $revIds = array();
 444                 foreach ( $this->mResult as $row ) {
 445                         if ( $row->rev_parent_id ) {
 446                                 $revIds[] = $row->rev_parent_id;
 447                         }
 448                         if ( !is_null( $row->user_name ) ) {
 449                                 $batch->add( NS_USER, $row->user_name );
 450                                 $batch->add( NS_USER_TALK, $row->user_name );
 451                         } else { # for anons or usernames of imported revisions
 452                                 $batch->add( NS_USER, $row->rev_user_text );
 453                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 454                         }
 455                 }
 456                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 457                 $batch->execute();
 458                 $this->mResult->seek( 0 );
 459         }
 460
 461         /**
 462          * Creates begin of history list with a submit button
 463          *
 464          * @return string HTML output
 465          */
 466         function getStartBody() {
 467                 $this->lastRow = false;
 468                 $this->counter = 1;
 469                 $this->oldIdChecked = 0;
 470
 471                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 472                 $s = Html::openElement( 'form', array( 'action' => wfScript(),
 473                         'id' => 'mw-history-compare' ) ) . "\n";
 474                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 475                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 476
 477                 // Button container stored in $this->buttons for re-use in getEndBody()
 478                 $this->buttons = '<div>';
 479                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 480                         array( 'class' => 'historysubmit mw-history-compareselectedversions-button' )
 481                                 + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' )
 482                 ) . "\n";
 483
 484                 if ( $this->getUser()->isAllowed( 'deleterevision' ) ) {
 485                         $this->buttons .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 486                 }
 487                 $this->buttons .= '</div>';
 488
 489                 $s .= $this->buttons;
 490                 $s .= '<ul id="pagehistory">' . "\n";
 491
 492                 return $s;
 493         }
 494
 495         private function getRevisionButton( $name, $msg ) {
 496                 $this->preventClickjacking();
 497                 # Note bug #20966, <button> is non-standard in IE<8
 498                 $element = Html::element(
 499                         'button',
 500                         array(
 501                                 'type' => 'submit',
 502                                 'name' => $name,
 503                                 'value' => '1',
 504                                 'class' => "historysubmit mw-history-$name-button",
 505                         ),
 506                         $this->msg( $msg )->text()
 507                 ) . "\n";
 508                 return $element;
 509         }
 510
 511         function getEndBody() {
 512                 if ( $this->lastRow ) {
 513                         $latest = $this->counter == 1 && $this->mIsFirst;
 514                         $firstInList = $this->counter == 1;
 515                         if ( $this->mIsBackwards ) {
 516                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 517                                 if ( $this->mOffset == '' ) {
 518                                         $next = null;
 519                                 } else {
 520                                         $next = 'unknown';
 521                                 }
 522                         } else {
 523                                 # The next row is the past-the-end row
 524                                 $next = $this->mPastTheEndRow;
 525                         }
 526                         $this->counter++;
 527                         $s = $this->historyLine( $this->lastRow, $next,
 528                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 529                 } else {
 530                         $s = '';
 531                 }
 532                 $s .= "</ul>\n";
 533                 # Add second buttons only if there is more than one rev
 534                 if ( $this->getNumRows() > 2 ) {
 535                         $s .= $this->buttons;
 536                 }
 537                 $s .= '</form>';
 538
 539                 return $s;
 540         }
 541
 542         /**
 543          * Creates a submit button
 544          *
 545          * @param string $message Text of the submit button, will be escaped
 546          * @param array $attributes Attributes
 547          * @return string HTML output for the submit button
 548          */
 549         function submitButton( $message, $attributes = array() ) {
 550                 # Disable submit button if history has 1 revision only
 551                 if ( $this->getNumRows() > 1 ) {
 552                         return Xml::submitButton( $message, $attributes );
 553                 } else {
 554                         return '';
 555                 }
 556         }
 557
 558         /**
 559          * Returns a row from the history printout.
 560          *
 561          * @todo document some more, and maybe clean up the code (some params redundant?)
 562          *
 563          * @param stdClass $row The database row corresponding to the previous line.
 564          * @param mixed $next The database row corresponding to the next line
 565          *   (chronologically previous)
 566          * @param bool|string $notificationtimestamp
 567          * @param bool $latest Whether this row corresponds to the page's latest revision.
 568          * @param bool $firstInList Whether this row corresponds to the first
 569          *   displayed on this history page.
 570          * @return string HTML output for the row
 571          */
 572         function historyLine( $row, $next, $notificationtimestamp = false,
 573                 $latest = false, $firstInList = false ) {
 574                 $rev = new Revision( $row );
 575                 $rev->setTitle( $this->getTitle() );
 576
 577                 if ( is_object( $next ) ) {
 578                         $prevRev = new Revision( $next );
 579                         $prevRev->setTitle( $this->getTitle() );
 580                 } else {
 581                         $prevRev = null;
 582                 }
 583
 584                 $curlink = $this->curLink( $rev, $latest );
 585                 $lastlink = $this->lastLink( $rev, $next );
 586                 $curLastlinks = $curlink . $this->historyPage->message['pipe-separator'] . $lastlink;
 587                 $histLinks = Html::rawElement(
 588                         'span',
 589                         array( 'class' => 'mw-history-histlinks' ),
 590                         $this->msg( 'parentheses' )->rawParams( $curLastlinks )->escaped()
 591                 );
 592
 593                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 594                 $s = $histLinks . $diffButtons;
 595
 596                 $link = $this->revLink( $rev );
 597                 $classes = array();
 598
 599                 $del = '';
 600                 $user = $this->getUser();
 601                 // Show checkboxes for each revision
 602                 if ( $user->isAllowed( 'deleterevision' ) ) {
 603                         $this->preventClickjacking();
 604                         // If revision was hidden from sysops, disable the checkbox
 605                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 606                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 607                         // Otherwise, enable the checkbox...
 608                         } else {
 609                                 $del = Xml::check( 'showhiderevisions', false,
 610                                         array( 'name' => 'ids[' . $rev->getId() . ']' ) );
 611                         }
 612                 // User can only view deleted revisions...
 613                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 614                         // If revision was hidden from sysops, disable the link
 615                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 616                                 $del = Linker::revDeleteLinkDisabled( false );
 617                         // Otherwise, show the link...
 618                         } else {
 619                                 $query = array( 'type' => 'revision',
 620                                         'target' => $this->getTitle()->getPrefixedDBkey(), 'ids' => $rev->getId() );
 621                                 $del .= Linker::revDeleteLink( $query,
 622                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 623                         }
 624                 }
 625                 if ( $del ) {
 626                         $s .= " $del ";
 627                 }
 628
 629                 $lang = $this->getLanguage();
 630                 $dirmark = $lang->getDirMark();
 631
 632                 $s .= " $link";
 633                 $s .= $dirmark;
 634                 $s .= " <span class='history-user'>" .
 635                         Linker::revUserTools( $rev, true ) . "</span>";
 636                 $s .= $dirmark;
 637
 638                 if ( $rev->isMinor() ) {
 639                         $s .= ' ' . ChangesList::flag( 'minor' );
 640                 }
 641
 642                 # Sometimes rev_len isn't populated
 643                 if ( $rev->getSize() !== null ) {
 644                         # Size is always public data
 645                         $prevSize = isset( $this->parentLens[$row->rev_parent_id] )
 646                                 ? $this->parentLens[$row->rev_parent_id]
 647                                 : 0;
 648                         $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 649                         $fSize = Linker::formatRevisionSize( $rev->getSize() );
 650                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . "$fSize $sDiff";
 651                 }
 652
 653                 # Text following the character difference is added just before running hooks
 654                 $s2 = Linker::revComment( $rev, false, true );
 655
 656                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 657                         $s2 .= ' <span class="updatedmarker">' . $this->msg( 'updatedmarker' )->escaped() . '</span>';
 658                         $classes[] = 'mw-history-line-updated';
 659                 }
 660
 661                 $tools = array();
 662
 663                 # Rollback and undo links
 664                 if ( $prevRev && $this->getTitle()->quickUserCan( 'edit', $user ) ) {
 665                         if ( $latest && $this->getTitle()->quickUserCan( 'rollback', $user ) ) {
 666                                 // Get a rollback link without the brackets
 667                                 $rollbackLink = Linker::generateRollback(
 668                                         $rev,
 669                                         $this->getContext(),
 670                                         array( 'verify', 'noBrackets' )
 671                                 );
 672                                 if ( $rollbackLink ) {
 673                                         $this->preventClickjacking();
 674                                         $tools[] = $rollbackLink;
 675                                 }
 676                         }
 677
 678                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 679                                 && !$prevRev->isDeleted( Revision::DELETED_TEXT )
 680                         ) {
 681                                 # Create undo tooltip for the first (=latest) line only
 682                                 $undoTooltip = $latest
 683                                         ? array( 'title' => $this->msg( 'tooltip-undo' )->text() )
 684                                         : array();
 685                                 $undolink = Linker::linkKnown(
 686                                         $this->getTitle(),
 687                                         $this->msg( 'editundo' )->escaped(),
 688                                         $undoTooltip,
 689                                         array(
 690                                                 'action' => 'edit',
 691                                                 'undoafter' => $prevRev->getId(),
 692                                                 'undo' => $rev->getId()
 693                                         )
 694                                 );
 695                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 696                         }
 697                 }
 698                 // Allow extension to add their own links here
 699                 wfRunHooks( 'HistoryRevisionTools', array( $rev, &$tools ) );
 700
 701                 if ( $tools ) {
 702                         $s2 .= ' ' . $this->msg( 'parentheses' )->rawParams( $lang->pipeList( $tools ) )->escaped();
 703                 }
 704
 705                 # Tags
 706                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 707                 $classes = array_merge( $classes, $newClasses );
 708                 if ( $tagSummary !== '' ) {
 709                         $s2 .= " $tagSummary";
 710                 }
 711
 712                 # Include separator between character difference and following text
 713                 if ( $s2 !== '' ) {
 714                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . $s2;
 715                 }
 716
 717                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row, &$s, &$classes ) );
 718
 719                 $attribs = array();
 720                 if ( $classes ) {
 721                         $attribs['class'] = implode( ' ', $classes );
 722                 }
 723
 724                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 725         }
 726
 727         /**
 728          * Create a link to view this revision of the page
 729          *
 730          * @param Revision $rev
 731          * @return string
 732          */
 733         function revLink( $rev ) {
 734                 $date = $this->getLanguage()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 735                 $date = htmlspecialchars( $date );
 736                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 737                         $link = Linker::linkKnown(
 738                                 $this->getTitle(),
 739                                 $date,
 740                                 array( 'class' => 'mw-changeslist-date' ),
 741                                 array( 'oldid' => $rev->getId() )
 742                         );
 743                 } else {
 744                         $link = $date;
 745                 }
 746                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 747                         $link = "<span class=\"history-deleted\">$link</span>";
 748                 }
 749
 750                 return $link;
 751         }
 752
 753         /**
 754          * Create a diff-to-current link for this revision for this page
 755          *
 756          * @param Revision $rev
 757          * @param bool $latest This is the latest revision of the page?
 758          * @return string
 759          */
 760         function curLink( $rev, $latest ) {
 761                 $cur = $this->historyPage->message['cur'];
 762                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 763                         return $cur;
 764                 } else {
 765                         return Linker::linkKnown(
 766                                 $this->getTitle(),
 767                                 $cur,
 768                                 array(),
 769                                 array(
 770                                         'diff' => $this->getWikiPage()->getLatest(),
 771                                         'oldid' => $rev->getId()
 772                                 )
 773                         );
 774                 }
 775         }
 776
 777         /**
 778          * Create a diff-to-previous link for this revision for this page.
 779          *
 780          * @param Revision $prevRev The revision being displayed
 781          * @param stdClass|string|null $next The next revision in list (that is
 782          *        the previous one in chronological order).
 783          *        May either be a row, "unknown" or null.
 784          * @return string
 785          */
 786         function lastLink( $prevRev, $next ) {
 787                 $last = $this->historyPage->message['last'];
 788
 789                 if ( $next === null ) {
 790                         # Probably no next row
 791                         return $last;
 792                 }
 793
 794                 if ( $next === 'unknown' ) {
 795                         # Next row probably exists but is unknown, use an oldid=prev link
 796                         return Linker::linkKnown(
 797                                 $this->getTitle(),
 798                                 $last,
 799                                 array(),
 800                                 array(
 801                                         'diff' => $prevRev->getId(),
 802                                         'oldid' => 'prev'
 803                                 )
 804                         );
 805                 }
 806
 807                 $nextRev = new Revision( $next );
 808
 809                 if ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 810                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 811                 ) {
 812                         return $last;
 813                 }
 814
 815                 return Linker::linkKnown(
 816                         $this->getTitle(),
 817                         $last,
 818                         array(),
 819                         array(
 820                                 'diff' => $prevRev->getId(),
 821                                 'oldid' => $next->rev_id
 822                         )
 823                 );
 824         }
 825
 826         /**
 827          * Create radio buttons for page history
 828          *
 829          * @param Revision $rev
 830          * @param bool $firstInList Is this version the first one?
 831          *
 832          * @return string HTML output for the radio buttons
 833          */
 834         function diffButtons( $rev, $firstInList ) {
 835                 if ( $this->getNumRows() > 1 ) {
 836                         $id = $rev->getId();
 837                         $radio = array( 'type' => 'radio', 'value' => $id );
 838                         /** @todo Move title texts to javascript */
 839                         if ( $firstInList ) {
 840                                 $first = Xml::element( 'input',
 841                                         array_merge( $radio, array(
 842                                                 'style' => 'visibility:hidden',
 843                                                 'name' => 'oldid',
 844                                                 'id' => 'mw-oldid-null' ) )
 845                                 );
 846                                 $checkmark = array( 'checked' => 'checked' );
 847                         } else {
 848                                 # Check visibility of old revisions
 849                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 850                                         $radio['disabled'] = 'disabled';
 851                                         $checkmark = array(); // We will check the next possible one
 852                                 } elseif ( !$this->oldIdChecked ) {
 853                                         $checkmark = array( 'checked' => 'checked' );
 854                                         $this->oldIdChecked = $id;
 855                                 } else {
 856                                         $checkmark = array();
 857                                 }
 858                                 $first = Xml::element( 'input',
 859                                         array_merge( $radio, $checkmark, array(
 860                                                 'name' => 'oldid',
 861                                                 'id' => "mw-oldid-$id" ) ) );
 862                                 $checkmark = array();
 863                         }
 864                         $second = Xml::element( 'input',
 865                                 array_merge( $radio, $checkmark, array(
 866                                         'name' => 'diff',
 867                                         'id' => "mw-diff-$id" ) ) );
 868
 869                         return $first . $second;
 870                 } else {
 871                         return '';
 872                 }
 873         }
 874
 875         /**
 876          * This is called if a write operation is possible from the generated HTML
 877          * @param bool $enable
 878          */
 879         function preventClickjacking( $enable = true ) {
 880                 $this->preventClickjacking = $enable;
 881         }
 882
 883         /**
 884          * Get the "prevent clickjacking" flag
 885          * @return bool
 886          */
 887         function getPreventClickjacking() {
 888                 return $this->preventClickjacking;
 889         }
 890 }