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                 global $wgScript, $wgUseFileCache;
  96
  97                 $out = $this->getOutput();
  98                 $request = $this->getRequest();
  99
 100                 /**
 101                  * Allow client caching.
 102                  */
 103                 if ( $out->checkLastModified( $this->page->getTouched() ) ) {
 104                         return; // Client cache fresh and headers sent, nothing more to do.
 105                 }
 106
 107                 wfProfileIn( __METHOD__ );
 108
 109                 $this->preCacheMessages();
 110
 111                 # Fill in the file cache if not set already
 112                 if ( $wgUseFileCache && HTMLFileCache::useFileCache( $this->getContext() ) ) {
 113                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'history' );
 114                         if ( !$cache->isCacheGood( /* Assume up to date */ ) ) {
 115                                 ob_start( array( &$cache, 'saveToFileCache' ) );
 116                         }
 117                 }
 118
 119                 // Setup page variables.
 120                 $out->setFeedAppendQuery( 'action=history' );
 121                 $out->addModules( 'mediawiki.action.history' );
 122
 123                 // Handle atom/RSS feeds.
 124                 $feedType = $request->getVal( 'feed' );
 125                 if ( $feedType ) {
 126                         $this->feed( $feedType );
 127                         wfProfileOut( __METHOD__ );
 128
 129                         return;
 130                 }
 131
 132                 // Fail nicely if article doesn't exist.
 133                 if ( !$this->page->exists() ) {
 134                         $out->addWikiMsg( 'nohistory' );
 135                         # show deletion/move log if there is an entry
 136                         LogEventsList::showLogExtract(
 137                                 $out,
 138                                 array( 'delete', 'move' ),
 139                                 $this->getTitle(),
 140                                 '',
 141                                 array( 'lim' => 10,
 142                                         'conds' => array( "log_action != 'revision'" ),
 143                                         'showIfEmpty' => false,
 144                                         'msgKey' => array( 'moveddeleted-notice' )
 145                                 )
 146                         );
 147                         wfProfileOut( __METHOD__ );
 148
 149                         return;
 150                 }
 151
 152                 /**
 153                  * Add date selector to quickly get to a certain time
 154                  */
 155                 $year = $request->getInt( 'year' );
 156                 $month = $request->getInt( 'month' );
 157                 $tagFilter = $request->getVal( 'tagfilter' );
 158                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 159
 160                 /**
 161                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 162                  */
 163                 if ( $request->getBool( 'deleted' ) ) {
 164                         $conds = array( 'rev_deleted != 0' );
 165                 } else {
 166                         $conds = array();
 167                 }
 168                 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
 169                         $checkDeleted = Xml::checkLabel( $this->msg( 'history-show-deleted' )->text(),
 170                                 'deleted', 'mw-show-deleted-only', $request->getBool( 'deleted' ) ) . "\n";
 171                 } else {
 172                         $checkDeleted = '';
 173                 }
 174
 175                 // Add the general form
 176                 $action = htmlspecialchars( $wgScript );
 177                 $out->addHTML(
 178                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 179                         Xml::fieldset(
 180                                 $this->msg( 'history-fieldset-title' )->text(),
 181                                 false,
 182                                 array( 'id' => 'mw-history-search' )
 183                         ) .
 184                         Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n" .
 185                         Html::hidden( 'action', 'history' ) . "\n" .
 186                         Xml::dateMenu(
 187                                 ( $year == null ? MWTimestamp::getLocalInstance()->format( 'Y' ) : $year ),
 188                                 $month
 189                         ) . '&#160;' .
 190                         ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
 191                         $checkDeleted .
 192                         Xml::submitButton( $this->msg( 'allpagessubmit' )->text() ) . "\n" .
 193                         '</fieldset></form>'
 194                 );
 195
 196                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->page, $this->getContext() ) );
 197
 198                 // Create and output the list.
 199                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 200                 $out->addHTML(
 201                         $pager->getNavigationBar() .
 202                         $pager->getBody() .
 203                         $pager->getNavigationBar()
 204                 );
 205                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 206
 207                 wfProfileOut( __METHOD__ );
 208         }
 209
 210         /**
 211          * Fetch an array of revisions, specified by a given limit, offset and
 212          * direction. This is now only used by the feeds. It was previously
 213          * used by the main UI but that's now handled by the pager.
 214          *
 215          * @param $limit Integer: the limit number of revisions to get
 216          * @param $offset Integer
 217          * @param $direction Integer: either HistoryPage::DIR_PREV or HistoryPage::DIR_NEXT
 218          * @return ResultWrapper
 219          */
 220         function fetchRevisions( $limit, $offset, $direction ) {
 221                 // Fail if article doesn't exist.
 222                 if ( !$this->getTitle()->exists() ) {
 223                         return new FakeResultWrapper( array() );
 224                 }
 225
 226                 $dbr = wfGetDB( DB_SLAVE );
 227
 228                 if ( $direction == HistoryPage::DIR_PREV ) {
 229                         list( $dirs, $oper ) = array( "ASC", ">=" );
 230                 } else { /* $direction == HistoryPage::DIR_NEXT */
 231                         list( $dirs, $oper ) = array( "DESC", "<=" );
 232                 }
 233
 234                 if ( $offset ) {
 235                         $offsets = array( "rev_timestamp $oper " . $dbr->addQuotes( $dbr->timestamp( $offset ) ) );
 236                 } else {
 237                         $offsets = array();
 238                 }
 239
 240                 $page_id = $this->page->getId();
 241
 242                 return $dbr->select( 'revision',
 243                         Revision::selectFields(),
 244                         array_merge( array( 'rev_page' => $page_id ), $offsets ),
 245                         __METHOD__,
 246                         array( 'ORDER BY' => "rev_timestamp $dirs",
 247                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit )
 248                 );
 249         }
 250
 251         /**
 252          * Output a subscription feed listing recent edits to this page.
 253          *
 254          * @param string $type feed type
 255          */
 256         function feed( $type ) {
 257                 global $wgFeedClasses, $wgFeedLimit;
 258                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 259                         return;
 260                 }
 261                 $request = $this->getRequest();
 262
 263                 $feed = new $wgFeedClasses[$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( max( $limit, 1 ), $wgFeedLimit );
 274
 275                 $items = $this->fetchRevisions( $limit, 0, HistoryPage::DIR_NEXT );
 276
 277                 // Generate feed elements enclosed between header and footer.
 278                 $feed->outHeader();
 279                 if ( $items->numRows() ) {
 280                         foreach ( $items as $row ) {
 281                                 $feed->outItem( $this->feedItem( $row ) );
 282                         }
 283                 } else {
 284                         $feed->outItem( $this->feedEmpty() );
 285                 }
 286                 $feed->outFooter();
 287         }
 288
 289         function feedEmpty() {
 290                 return new FeedItem(
 291                         $this->msg( 'nohistory' )->inContentLanguage()->text(),
 292                         $this->msg( 'history-feed-empty' )->inContentLanguage()->parseAsBlock(),
 293                         $this->getTitle()->getFullURL(),
 294                         wfTimestamp( TS_MW ),
 295                         '',
 296                         $this->getTitle()->getTalkPage()->getFullURL()
 297                 );
 298         }
 299
 300         /**
 301          * Generate a FeedItem object from a given revision table row
 302          * Borrows Recent Changes' feed generation functions for formatting;
 303          * includes a diff to the previous revision (if any).
 304          *
 305          * @param $row Object: database row
 306          * @return FeedItem
 307          */
 308         function feedItem( $row ) {
 309                 $rev = new Revision( $row );
 310                 $rev->setTitle( $this->getTitle() );
 311                 $text = FeedUtils::formatDiffRow(
 312                         $this->getTitle(),
 313                         $this->getTitle()->getPreviousRevisionID( $rev->getId() ),
 314                         $rev->getId(),
 315                         $rev->getTimestamp(),
 316                         $rev->getComment()
 317                 );
 318                 if ( $rev->getComment() == '' ) {
 319                         global $wgContLang;
 320                         $title = $this->msg( 'history-feed-item-nocomment',
 321                                 $rev->getUserText(),
 322                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 323                                 $wgContLang->date( $rev->getTimestamp() ),
 324                                 $wgContLang->time( $rev->getTimestamp() ) )->inContentLanguage()->text();
 325                 } else {
 326                         $title = $rev->getUserText() .
 327                                 $this->msg( 'colon-separator' )->inContentLanguage()->text() .
 328                                 FeedItem::stripComment( $rev->getComment() );
 329                 }
 330
 331                 return new FeedItem(
 332                         $title,
 333                         $text,
 334                         $this->getTitle()->getFullURL( 'diff=' . $rev->getId() . '&oldid=prev' ),
 335                         $rev->getTimestamp(),
 336                         $rev->getUserText(),
 337                         $this->getTitle()->getTalkPage()->getFullURL()
 338                 );
 339         }
 340 }
 341
 342 /**
 343  * @ingroup Pager
 344  * @ingroup Actions
 345  */
 346 class HistoryPager extends ReverseChronologicalPager {
 347         /**
 348          * @var bool|stdClass
 349          */
 350         public $lastRow = false;
 351
 352         public $counter, $historyPage, $buttons, $conds;
 353
 354         protected $oldIdChecked;
 355
 356         protected $preventClickjacking = false;
 357         /**
 358          * @var array
 359          */
 360         protected $parentLens;
 361
 362         /**
 363          * @param HistoryAction $historyPage
 364          * @param string $year
 365          * @param string $month
 366          * @param string $tagFilter
 367          * @param array $conds
 368          */
 369         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
 370                 parent::__construct( $historyPage->getContext() );
 371                 $this->historyPage = $historyPage;
 372                 $this->tagFilter = $tagFilter;
 373                 $this->getDateCond( $year, $month );
 374                 $this->conds = $conds;
 375         }
 376
 377         // For hook compatibility...
 378         function getArticle() {
 379                 return $this->historyPage->getArticle();
 380         }
 381
 382         function getSqlComment() {
 383                 if ( $this->conds ) {
 384                         return 'history page filtered'; // potentially slow, see CR r58153
 385                 } else {
 386                         return 'history page unfiltered';
 387                 }
 388         }
 389
 390         function getQueryInfo() {
 391                 $queryInfo = array(
 392                         'tables' => array( 'revision', 'user' ),
 393                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 394                         'conds' => array_merge(
 395                                 array( 'rev_page' => $this->getWikiPage()->getId() ),
 396                                 $this->conds ),
 397                         'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
 398                         'join_conds' => array( 'user' => Revision::userJoinCond() ),
 399                 );
 400                 ChangeTags::modifyDisplayQuery(
 401                         $queryInfo['tables'],
 402                         $queryInfo['fields'],
 403                         $queryInfo['conds'],
 404                         $queryInfo['join_conds'],
 405                         $queryInfo['options'],
 406                         $this->tagFilter
 407                 );
 408                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 409
 410                 return $queryInfo;
 411         }
 412
 413         function getIndexField() {
 414                 return 'rev_timestamp';
 415         }
 416
 417         /**
 418          * @param stdClass $row
 419          * @return string
 420          */
 421         function formatRow( $row ) {
 422                 if ( $this->lastRow ) {
 423                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 424                         $firstInList = $this->counter == 1;
 425                         $this->counter++;
 426                         $s = $this->historyLine( $this->lastRow, $row,
 427                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 428                 } else {
 429                         $s = '';
 430                 }
 431                 $this->lastRow = $row;
 432
 433                 return $s;
 434         }
 435
 436         function doBatchLookups() {
 437                 # Do a link batch query
 438                 $this->mResult->seek( 0 );
 439                 $batch = new LinkBatch();
 440                 $revIds = array();
 441                 foreach ( $this->mResult as $row ) {
 442                         if ( $row->rev_parent_id ) {
 443                                 $revIds[] = $row->rev_parent_id;
 444                         }
 445                         if ( !is_null( $row->user_name ) ) {
 446                                 $batch->add( NS_USER, $row->user_name );
 447                                 $batch->add( NS_USER_TALK, $row->user_name );
 448                         } else { # for anons or usernames of imported revisions
 449                                 $batch->add( NS_USER, $row->rev_user_text );
 450                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 451                         }
 452                 }
 453                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 454                 $batch->execute();
 455                 $this->mResult->seek( 0 );
 456         }
 457
 458         /**
 459          * Creates begin of history list with a submit button
 460          *
 461          * @return string HTML output
 462          */
 463         function getStartBody() {
 464                 global $wgScript;
 465                 $this->lastRow = false;
 466                 $this->counter = 1;
 467                 $this->oldIdChecked = 0;
 468
 469                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 470                 $s = Html::openElement( 'form', array( 'action' => $wgScript,
 471                         'id' => 'mw-history-compare' ) ) . "\n";
 472                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 473                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 474
 475                 // Button container stored in $this->buttons for re-use in getEndBody()
 476                 $this->buttons = '<div>';
 477                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 478                         array( 'class' => 'historysubmit mw-history-compareselectedversions-button' )
 479                                 + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' )
 480                 ) . "\n";
 481
 482                 if ( $this->getUser()->isAllowed( 'deleterevision' ) ) {
 483                         $this->buttons .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 484                 }
 485                 $this->buttons .= '</div>';
 486
 487                 $s .= $this->buttons;
 488                 $s .= '<ul id="pagehistory">' . "\n";
 489
 490                 return $s;
 491         }
 492
 493         private function getRevisionButton( $name, $msg ) {
 494                 $this->preventClickjacking();
 495                 # Note bug #20966, <button> is non-standard in IE<8
 496                 $element = Html::element(
 497                         'button',
 498                         array(
 499                                 'type' => 'submit',
 500                                 'name' => $name,
 501                                 'value' => '1',
 502                                 'class' => "historysubmit mw-history-$name-button",
 503                         ),
 504                         $this->msg( $msg )->text()
 505                 ) . "\n";
 506                 return $element;
 507         }
 508
 509         function getEndBody() {
 510                 if ( $this->lastRow ) {
 511                         $latest = $this->counter == 1 && $this->mIsFirst;
 512                         $firstInList = $this->counter == 1;
 513                         if ( $this->mIsBackwards ) {
 514                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 515                                 if ( $this->mOffset == '' ) {
 516                                         $next = null;
 517                                 } else {
 518                                         $next = 'unknown';
 519                                 }
 520                         } else {
 521                                 # The next row is the past-the-end row
 522                                 $next = $this->mPastTheEndRow;
 523                         }
 524                         $this->counter++;
 525                         $s = $this->historyLine( $this->lastRow, $next,
 526                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 527                 } else {
 528                         $s = '';
 529                 }
 530                 $s .= "</ul>\n";
 531                 # Add second buttons only if there is more than one rev
 532                 if ( $this->getNumRows() > 2 ) {
 533                         $s .= $this->buttons;
 534                 }
 535                 $s .= '</form>';
 536
 537                 return $s;
 538         }
 539
 540         /**
 541          * Creates a submit button
 542          *
 543          * @param string $message text of the submit button, will be escaped
 544          * @param array $attributes attributes
 545          * @return String: HTML output for the submit button
 546          */
 547         function submitButton( $message, $attributes = array() ) {
 548                 # Disable submit button if history has 1 revision only
 549                 if ( $this->getNumRows() > 1 ) {
 550                         return Xml::submitButton( $message, $attributes );
 551                 } else {
 552                         return '';
 553                 }
 554         }
 555
 556         /**
 557          * Returns a row from the history printout.
 558          *
 559          * @todo document some more, and maybe clean up the code (some params redundant?)
 560          *
 561          * @param stdClass $row The database row corresponding to the previous line.
 562          * @param mixed $next The database row corresponding to the next line
 563          *   (chronologically previous)
 564          * @param bool|string $notificationtimestamp
 565          * @param bool $latest Whether this row corresponds to the page's latest revision.
 566          * @param bool $firstInList Whether this row corresponds to the first
 567          *   displayed on this history page.
 568          * @return string HTML output for the row
 569          */
 570         function historyLine( $row, $next, $notificationtimestamp = false,
 571                 $latest = false, $firstInList = false ) {
 572                 $rev = new Revision( $row );
 573                 $rev->setTitle( $this->getTitle() );
 574
 575                 if ( is_object( $next ) ) {
 576                         $prevRev = new Revision( $next );
 577                         $prevRev->setTitle( $this->getTitle() );
 578                 } else {
 579                         $prevRev = null;
 580                 }
 581
 582                 $curlink = $this->curLink( $rev, $latest );
 583                 $lastlink = $this->lastLink( $rev, $next );
 584                 $curLastlinks = $curlink . $this->historyPage->message['pipe-separator'] . $lastlink;
 585                 $histLinks = Html::rawElement(
 586                         'span',
 587                         array( 'class' => 'mw-history-histlinks' ),
 588                         $this->msg( 'parentheses' )->rawParams( $curLastlinks )->escaped()
 589                 );
 590
 591                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 592                 $s = $histLinks . $diffButtons;
 593
 594                 $link = $this->revLink( $rev );
 595                 $classes = array();
 596
 597                 $del = '';
 598                 $user = $this->getUser();
 599                 // Show checkboxes for each revision
 600                 if ( $user->isAllowed( 'deleterevision' ) ) {
 601                         $this->preventClickjacking();
 602                         // If revision was hidden from sysops, disable the checkbox
 603                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 604                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 605                         // Otherwise, enable the checkbox...
 606                         } else {
 607                                 $del = Xml::check( 'showhiderevisions', false,
 608                                         array( 'name' => 'ids[' . $rev->getId() . ']' ) );
 609                         }
 610                 // User can only view deleted revisions...
 611                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 612                         // If revision was hidden from sysops, disable the link
 613                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 614                                 $del = Linker::revDeleteLinkDisabled( false );
 615                         // Otherwise, show the link...
 616                         } else {
 617                                 $query = array( 'type' => 'revision',
 618                                         'target' => $this->getTitle()->getPrefixedDBkey(), 'ids' => $rev->getId() );
 619                                 $del .= Linker::revDeleteLink( $query,
 620                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 621                         }
 622                 }
 623                 if ( $del ) {
 624                         $s .= " $del ";
 625                 }
 626
 627                 $lang = $this->getLanguage();
 628                 $dirmark = $lang->getDirMark();
 629
 630                 $s .= " $link";
 631                 $s .= $dirmark;
 632                 $s .= " <span class='history-user'>" .
 633                         Linker::revUserTools( $rev, true ) . "</span>";
 634                 $s .= $dirmark;
 635
 636                 if ( $rev->isMinor() ) {
 637                         $s .= ' ' . ChangesList::flag( 'minor' );
 638                 }
 639
 640                 # Sometimes rev_len isn't populated
 641                 if ( $rev->getSize() !== null ) {
 642                         # Size is always public data
 643                         $prevSize = isset( $this->parentLens[$row->rev_parent_id] )
 644                                 ? $this->parentLens[$row->rev_parent_id]
 645                                 : 0;
 646                         $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 647                         $fSize = Linker::formatRevisionSize( $rev->getSize() );
 648                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . "$fSize $sDiff";
 649                 }
 650
 651                 # Text following the character difference is added just before running hooks
 652                 $s2 = Linker::revComment( $rev, false, true );
 653
 654                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 655                         $s2 .= ' <span class="updatedmarker">' . $this->msg( 'updatedmarker' )->escaped() . '</span>';
 656                         $classes[] = 'mw-history-line-updated';
 657                 }
 658
 659                 $tools = array();
 660
 661                 # Rollback and undo links
 662                 if ( $prevRev && $this->getTitle()->quickUserCan( 'edit', $user ) ) {
 663                         if ( $latest && $this->getTitle()->quickUserCan( 'rollback', $user ) ) {
 664                                 // Get a rollback link without the brackets
 665                                 $rollbackLink = Linker::generateRollback(
 666                                         $rev,
 667                                         $this->getContext(),
 668                                         array( 'verify', 'noBrackets' )
 669                                 );
 670                                 if ( $rollbackLink ) {
 671                                         $this->preventClickjacking();
 672                                         $tools[] = $rollbackLink;
 673                                 }
 674                         }
 675
 676                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 677                                 && !$prevRev->isDeleted( Revision::DELETED_TEXT )
 678                         ) {
 679                                 # Create undo tooltip for the first (=latest) line only
 680                                 $undoTooltip = $latest
 681                                         ? array( 'title' => $this->msg( 'tooltip-undo' )->text() )
 682                                         : array();
 683                                 $undolink = Linker::linkKnown(
 684                                         $this->getTitle(),
 685                                         $this->msg( 'editundo' )->escaped(),
 686                                         $undoTooltip,
 687                                         array(
 688                                                 'action' => 'edit',
 689                                                 'undoafter' => $prevRev->getId(),
 690                                                 'undo' => $rev->getId()
 691                                         )
 692                                 );
 693                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 694                         }
 695                 }
 696                 // Allow extension to add their own links here
 697                 wfRunHooks( 'HistoryRevisionTools', array( $rev, &$tools ) );
 698
 699                 if ( $tools ) {
 700                         $s2 .= ' ' . $this->msg( 'parentheses' )->rawParams( $lang->pipeList( $tools ) )->escaped();
 701                 }
 702
 703                 # Tags
 704                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 705                 $classes = array_merge( $classes, $newClasses );
 706                 if ( $tagSummary !== '' ) {
 707                         $s2 .= " $tagSummary";
 708                 }
 709
 710                 # Include separator between character difference and following text
 711                 if ( $s2 !== '' ) {
 712                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . $s2;
 713                 }
 714
 715                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row, &$s, &$classes ) );
 716
 717                 $attribs = array();
 718                 if ( $classes ) {
 719                         $attribs['class'] = implode( ' ', $classes );
 720                 }
 721
 722                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 723         }
 724
 725         /**
 726          * Create a link to view this revision of the page
 727          *
 728          * @param $rev Revision
 729          * @return String
 730          */
 731         function revLink( $rev ) {
 732                 $date = $this->getLanguage()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 733                 $date = htmlspecialchars( $date );
 734                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 735                         $link = Linker::linkKnown(
 736                                 $this->getTitle(),
 737                                 $date,
 738                                 array( 'class' => 'mw-changeslist-date' ),
 739                                 array( 'oldid' => $rev->getId() )
 740                         );
 741                 } else {
 742                         $link = $date;
 743                 }
 744                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 745                         $link = "<span class=\"history-deleted\">$link</span>";
 746                 }
 747
 748                 return $link;
 749         }
 750
 751         /**
 752          * Create a diff-to-current link for this revision for this page
 753          *
 754          * @param $rev Revision
 755          * @param $latest Boolean: this is the latest revision of the page?
 756          * @return String
 757          */
 758         function curLink( $rev, $latest ) {
 759                 $cur = $this->historyPage->message['cur'];
 760                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 761                         return $cur;
 762                 } else {
 763                         return Linker::linkKnown(
 764                                 $this->getTitle(),
 765                                 $cur,
 766                                 array(),
 767                                 array(
 768                                         'diff' => $this->getWikiPage()->getLatest(),
 769                                         'oldid' => $rev->getId()
 770                                 )
 771                         );
 772                 }
 773         }
 774
 775         /**
 776          * Create a diff-to-previous link for this revision for this page.
 777          *
 778          * @param $prevRev Revision: the previous revision
 779          * @param $next Mixed: the newer revision
 780          * @return String
 781          */
 782         function lastLink( $prevRev, $next ) {
 783                 $last = $this->historyPage->message['last'];
 784                 # $next may either be a Row, null, or "unkown"
 785                 $nextRev = is_object( $next ) ? new Revision( $next ) : $next;
 786                 if ( is_null( $next ) ) {
 787                         # Probably no next row
 788                         return $last;
 789                 } elseif ( $next === 'unknown' ) {
 790                         # Next row probably exists but is unknown, use an oldid=prev link
 791                         return Linker::linkKnown(
 792                                 $this->getTitle(),
 793                                 $last,
 794                                 array(),
 795                                 array(
 796                                         'diff' => $prevRev->getId(),
 797                                         'oldid' => 'prev'
 798                                 )
 799                         );
 800                 } elseif ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 801                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 802                 ) {
 803                         return $last;
 804                 } else {
 805                         return Linker::linkKnown(
 806                                 $this->getTitle(),
 807                                 $last,
 808                                 array(),
 809                                 array(
 810                                         'diff' => $prevRev->getId(),
 811                                         'oldid' => $next->rev_id
 812                                 )
 813                         );
 814                 }
 815         }
 816
 817         /**
 818          * Create radio buttons for page history
 819          *
 820          * @param $rev Revision object
 821          * @param $firstInList Boolean: is this version the first one?
 822          *
 823          * @return String: HTML output for the radio buttons
 824          */
 825         function diffButtons( $rev, $firstInList ) {
 826                 if ( $this->getNumRows() > 1 ) {
 827                         $id = $rev->getId();
 828                         $radio = array( 'type' => 'radio', 'value' => $id );
 829                         /** @todo Move title texts to javascript */
 830                         if ( $firstInList ) {
 831                                 $first = Xml::element( 'input',
 832                                         array_merge( $radio, array(
 833                                                 'style' => 'visibility:hidden',
 834                                                 'name' => 'oldid',
 835                                                 'id' => 'mw-oldid-null' ) )
 836                                 );
 837                                 $checkmark = array( 'checked' => 'checked' );
 838                         } else {
 839                                 # Check visibility of old revisions
 840                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 841                                         $radio['disabled'] = 'disabled';
 842                                         $checkmark = array(); // We will check the next possible one
 843                                 } elseif ( !$this->oldIdChecked ) {
 844                                         $checkmark = array( 'checked' => 'checked' );
 845                                         $this->oldIdChecked = $id;
 846                                 } else {
 847                                         $checkmark = array();
 848                                 }
 849                                 $first = Xml::element( 'input',
 850                                         array_merge( $radio, $checkmark, array(
 851                                                 'name' => 'oldid',
 852                                                 'id' => "mw-oldid-$id" ) ) );
 853                                 $checkmark = array();
 854                         }
 855                         $second = Xml::element( 'input',
 856                                 array_merge( $radio, $checkmark, array(
 857                                         'name' => 'diff',
 858                                         'id' => "mw-diff-$id" ) ) );
 859
 860                         return $first . $second;
 861                 } else {
 862                         return '';
 863                 }
 864         }
 865
 866         /**
 867          * This is called if a write operation is possible from the generated HTML
 868          */
 869         function preventClickjacking( $enable = true ) {
 870                 $this->preventClickjacking = $enable;
 871         }
 872
 873         /**
 874          * Get the "prevent clickjacking" flag
 875          * @return bool
 876          */
 877         function getPreventClickjacking() {
 878                 return $this->preventClickjacking;
 879         }
 880 }
 881
 882 /**
 883  * Backwards-compatibility alias
 884  */
 885 class HistoryPage extends HistoryAction {
 886         // @codingStandardsIgnoreStart Needed "useless" override to make it public.
 887         public function __construct( Page $article ) {
 888                 parent::__construct( $article );
 889         }
 890         // @codingStandardsIgnoreEnd
 891
 892         public function history() {
 893                 $this->onView();
 894         }
 895 }