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 int $limit The limit number of revisions to get
 216          * @param int $offset
 217          * @param int $direction 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                 /** @var RSSFeed|AtomFeed $feed */
 264                 $feed = new $wgFeedClasses[$type](
 265                         $this->getTitle()->getPrefixedText() . ' - ' .
 266                         $this->msg( 'history-feed-title' )->inContentLanguage()->text(),
 267                         $this->msg( 'history-feed-description' )->inContentLanguage()->text(),
 268                         $this->getTitle()->getFullURL( 'action=history' )
 269                 );
 270
 271                 // Get a limit on number of feed entries. Provide a sane default
 272                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 273                 $limit = $request->getInt( 'limit', 10 );
 274                 $limit = min( max( $limit, 1 ), $wgFeedLimit );
 275
 276                 $items = $this->fetchRevisions( $limit, 0, HistoryPage::DIR_NEXT );
 277
 278                 // Generate feed elements enclosed between header and footer.
 279                 $feed->outHeader();
 280                 if ( $items->numRows() ) {
 281                         foreach ( $items as $row ) {
 282                                 $feed->outItem( $this->feedItem( $row ) );
 283                         }
 284                 } else {
 285                         $feed->outItem( $this->feedEmpty() );
 286                 }
 287                 $feed->outFooter();
 288         }
 289
 290         function feedEmpty() {
 291                 return new FeedItem(
 292                         $this->msg( 'nohistory' )->inContentLanguage()->text(),
 293                         $this->msg( 'history-feed-empty' )->inContentLanguage()->parseAsBlock(),
 294                         $this->getTitle()->getFullURL(),
 295                         wfTimestamp( TS_MW ),
 296                         '',
 297                         $this->getTitle()->getTalkPage()->getFullURL()
 298                 );
 299         }
 300
 301         /**
 302          * Generate a FeedItem object from a given revision table row
 303          * Borrows Recent Changes' feed generation functions for formatting;
 304          * includes a diff to the previous revision (if any).
 305          *
 306          * @param stdClass|array $row database row
 307          * @return FeedItem
 308          */
 309         function feedItem( $row ) {
 310                 $rev = new Revision( $row );
 311                 $rev->setTitle( $this->getTitle() );
 312                 $text = FeedUtils::formatDiffRow(
 313                         $this->getTitle(),
 314                         $this->getTitle()->getPreviousRevisionID( $rev->getId() ),
 315                         $rev->getId(),
 316                         $rev->getTimestamp(),
 317                         $rev->getComment()
 318                 );
 319                 if ( $rev->getComment() == '' ) {
 320                         global $wgContLang;
 321                         $title = $this->msg( 'history-feed-item-nocomment',
 322                                 $rev->getUserText(),
 323                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 324                                 $wgContLang->date( $rev->getTimestamp() ),
 325                                 $wgContLang->time( $rev->getTimestamp() ) )->inContentLanguage()->text();
 326                 } else {
 327                         $title = $rev->getUserText() .
 328                                 $this->msg( 'colon-separator' )->inContentLanguage()->text() .
 329                                 FeedItem::stripComment( $rev->getComment() );
 330                 }
 331
 332                 return new FeedItem(
 333                         $title,
 334                         $text,
 335                         $this->getTitle()->getFullURL( 'diff=' . $rev->getId() . '&oldid=prev' ),
 336                         $rev->getTimestamp(),
 337                         $rev->getUserText(),
 338                         $this->getTitle()->getTalkPage()->getFullURL()
 339                 );
 340         }
 341 }
 342
 343 /**
 344  * @ingroup Pager
 345  * @ingroup Actions
 346  */
 347 class HistoryPager extends ReverseChronologicalPager {
 348         /**
 349          * @var bool|stdClass
 350          */
 351         public $lastRow = false;
 352
 353         public $counter, $historyPage, $buttons, $conds;
 354
 355         protected $oldIdChecked;
 356
 357         protected $preventClickjacking = false;
 358         /**
 359          * @var array
 360          */
 361         protected $parentLens;
 362
 363         /**
 364          * @param HistoryAction $historyPage
 365          * @param string $year
 366          * @param string $month
 367          * @param string $tagFilter
 368          * @param array $conds
 369          */
 370         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
 371                 parent::__construct( $historyPage->getContext() );
 372                 $this->historyPage = $historyPage;
 373                 $this->tagFilter = $tagFilter;
 374                 $this->getDateCond( $year, $month );
 375                 $this->conds = $conds;
 376         }
 377
 378         // For hook compatibility...
 379         function getArticle() {
 380                 return $this->historyPage->getArticle();
 381         }
 382
 383         function getSqlComment() {
 384                 if ( $this->conds ) {
 385                         return 'history page filtered'; // potentially slow, see CR r58153
 386                 } else {
 387                         return 'history page unfiltered';
 388                 }
 389         }
 390
 391         function getQueryInfo() {
 392                 $queryInfo = array(
 393                         'tables' => array( 'revision', 'user' ),
 394                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 395                         'conds' => array_merge(
 396                                 array( 'rev_page' => $this->getWikiPage()->getId() ),
 397                                 $this->conds ),
 398                         'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
 399                         'join_conds' => array( 'user' => Revision::userJoinCond() ),
 400                 );
 401                 ChangeTags::modifyDisplayQuery(
 402                         $queryInfo['tables'],
 403                         $queryInfo['fields'],
 404                         $queryInfo['conds'],
 405                         $queryInfo['join_conds'],
 406                         $queryInfo['options'],
 407                         $this->tagFilter
 408                 );
 409                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 410
 411                 return $queryInfo;
 412         }
 413
 414         function getIndexField() {
 415                 return 'rev_timestamp';
 416         }
 417
 418         /**
 419          * @param stdClass $row
 420          * @return string
 421          */
 422         function formatRow( $row ) {
 423                 if ( $this->lastRow ) {
 424                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 425                         $firstInList = $this->counter == 1;
 426                         $this->counter++;
 427                         $s = $this->historyLine( $this->lastRow, $row,
 428                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 429                 } else {
 430                         $s = '';
 431                 }
 432                 $this->lastRow = $row;
 433
 434                 return $s;
 435         }
 436
 437         function doBatchLookups() {
 438                 # Do a link batch query
 439                 $this->mResult->seek( 0 );
 440                 $batch = new LinkBatch();
 441                 $revIds = array();
 442                 foreach ( $this->mResult as $row ) {
 443                         if ( $row->rev_parent_id ) {
 444                                 $revIds[] = $row->rev_parent_id;
 445                         }
 446                         if ( !is_null( $row->user_name ) ) {
 447                                 $batch->add( NS_USER, $row->user_name );
 448                                 $batch->add( NS_USER_TALK, $row->user_name );
 449                         } else { # for anons or usernames of imported revisions
 450                                 $batch->add( NS_USER, $row->rev_user_text );
 451                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 452                         }
 453                 }
 454                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 455                 $batch->execute();
 456                 $this->mResult->seek( 0 );
 457         }
 458
 459         /**
 460          * Creates begin of history list with a submit button
 461          *
 462          * @return string HTML output
 463          */
 464         function getStartBody() {
 465                 global $wgScript;
 466                 $this->lastRow = false;
 467                 $this->counter = 1;
 468                 $this->oldIdChecked = 0;
 469
 470                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 471                 $s = Html::openElement( 'form', array( 'action' => $wgScript,
 472                         'id' => 'mw-history-compare' ) ) . "\n";
 473                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 474                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 475
 476                 // Button container stored in $this->buttons for re-use in getEndBody()
 477                 $this->buttons = '<div>';
 478                 $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 479                         array( 'class' => 'historysubmit mw-history-compareselectedversions-button' )
 480                                 + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' )
 481                 ) . "\n";
 482
 483                 if ( $this->getUser()->isAllowed( 'deleterevision' ) ) {
 484                         $this->buttons .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
 485                 }
 486                 $this->buttons .= '</div>';
 487
 488                 $s .= $this->buttons;
 489                 $s .= '<ul id="pagehistory">' . "\n";
 490
 491                 return $s;
 492         }
 493
 494         private function getRevisionButton( $name, $msg ) {
 495                 $this->preventClickjacking();
 496                 # Note bug #20966, <button> is non-standard in IE<8
 497                 $element = Html::element(
 498                         'button',
 499                         array(
 500                                 'type' => 'submit',
 501                                 'name' => $name,
 502                                 'value' => '1',
 503                                 'class' => "historysubmit mw-history-$name-button",
 504                         ),
 505                         $this->msg( $msg )->text()
 506                 ) . "\n";
 507                 return $element;
 508         }
 509
 510         function getEndBody() {
 511                 if ( $this->lastRow ) {
 512                         $latest = $this->counter == 1 && $this->mIsFirst;
 513                         $firstInList = $this->counter == 1;
 514                         if ( $this->mIsBackwards ) {
 515                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 516                                 if ( $this->mOffset == '' ) {
 517                                         $next = null;
 518                                 } else {
 519                                         $next = 'unknown';
 520                                 }
 521                         } else {
 522                                 # The next row is the past-the-end row
 523                                 $next = $this->mPastTheEndRow;
 524                         }
 525                         $this->counter++;
 526                         $s = $this->historyLine( $this->lastRow, $next,
 527                                 $this->getTitle()->getNotificationTimestamp( $this->getUser() ), $latest, $firstInList );
 528                 } else {
 529                         $s = '';
 530                 }
 531                 $s .= "</ul>\n";
 532                 # Add second buttons only if there is more than one rev
 533                 if ( $this->getNumRows() > 2 ) {
 534                         $s .= $this->buttons;
 535                 }
 536                 $s .= '</form>';
 537
 538                 return $s;
 539         }
 540
 541         /**
 542          * Creates a submit button
 543          *
 544          * @param string $message Text of the submit button, will be escaped
 545          * @param array $attributes Attributes
 546          * @return string HTML output for the submit button
 547          */
 548         function submitButton( $message, $attributes = array() ) {
 549                 # Disable submit button if history has 1 revision only
 550                 if ( $this->getNumRows() > 1 ) {
 551                         return Xml::submitButton( $message, $attributes );
 552                 } else {
 553                         return '';
 554                 }
 555         }
 556
 557         /**
 558          * Returns a row from the history printout.
 559          *
 560          * @todo document some more, and maybe clean up the code (some params redundant?)
 561          *
 562          * @param stdClass $row The database row corresponding to the previous line.
 563          * @param mixed $next The database row corresponding to the next line
 564          *   (chronologically previous)
 565          * @param bool|string $notificationtimestamp
 566          * @param bool $latest Whether this row corresponds to the page's latest revision.
 567          * @param bool $firstInList Whether this row corresponds to the first
 568          *   displayed on this history page.
 569          * @return string HTML output for the row
 570          */
 571         function historyLine( $row, $next, $notificationtimestamp = false,
 572                 $latest = false, $firstInList = false ) {
 573                 $rev = new Revision( $row );
 574                 $rev->setTitle( $this->getTitle() );
 575
 576                 if ( is_object( $next ) ) {
 577                         $prevRev = new Revision( $next );
 578                         $prevRev->setTitle( $this->getTitle() );
 579                 } else {
 580                         $prevRev = null;
 581                 }
 582
 583                 $curlink = $this->curLink( $rev, $latest );
 584                 $lastlink = $this->lastLink( $rev, $next );
 585                 $curLastlinks = $curlink . $this->historyPage->message['pipe-separator'] . $lastlink;
 586                 $histLinks = Html::rawElement(
 587                         'span',
 588                         array( 'class' => 'mw-history-histlinks' ),
 589                         $this->msg( 'parentheses' )->rawParams( $curLastlinks )->escaped()
 590                 );
 591
 592                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 593                 $s = $histLinks . $diffButtons;
 594
 595                 $link = $this->revLink( $rev );
 596                 $classes = array();
 597
 598                 $del = '';
 599                 $user = $this->getUser();
 600                 // Show checkboxes for each revision
 601                 if ( $user->isAllowed( 'deleterevision' ) ) {
 602                         $this->preventClickjacking();
 603                         // If revision was hidden from sysops, disable the checkbox
 604                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 605                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 606                         // Otherwise, enable the checkbox...
 607                         } else {
 608                                 $del = Xml::check( 'showhiderevisions', false,
 609                                         array( 'name' => 'ids[' . $rev->getId() . ']' ) );
 610                         }
 611                 // User can only view deleted revisions...
 612                 } elseif ( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) {
 613                         // If revision was hidden from sysops, disable the link
 614                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
 615                                 $del = Linker::revDeleteLinkDisabled( false );
 616                         // Otherwise, show the link...
 617                         } else {
 618                                 $query = array( 'type' => 'revision',
 619                                         'target' => $this->getTitle()->getPrefixedDBkey(), 'ids' => $rev->getId() );
 620                                 $del .= Linker::revDeleteLink( $query,
 621                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 622                         }
 623                 }
 624                 if ( $del ) {
 625                         $s .= " $del ";
 626                 }
 627
 628                 $lang = $this->getLanguage();
 629                 $dirmark = $lang->getDirMark();
 630
 631                 $s .= " $link";
 632                 $s .= $dirmark;
 633                 $s .= " <span class='history-user'>" .
 634                         Linker::revUserTools( $rev, true ) . "</span>";
 635                 $s .= $dirmark;
 636
 637                 if ( $rev->isMinor() ) {
 638                         $s .= ' ' . ChangesList::flag( 'minor' );
 639                 }
 640
 641                 # Sometimes rev_len isn't populated
 642                 if ( $rev->getSize() !== null ) {
 643                         # Size is always public data
 644                         $prevSize = isset( $this->parentLens[$row->rev_parent_id] )
 645                                 ? $this->parentLens[$row->rev_parent_id]
 646                                 : 0;
 647                         $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 648                         $fSize = Linker::formatRevisionSize( $rev->getSize() );
 649                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . "$fSize $sDiff";
 650                 }
 651
 652                 # Text following the character difference is added just before running hooks
 653                 $s2 = Linker::revComment( $rev, false, true );
 654
 655                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 656                         $s2 .= ' <span class="updatedmarker">' . $this->msg( 'updatedmarker' )->escaped() . '</span>';
 657                         $classes[] = 'mw-history-line-updated';
 658                 }
 659
 660                 $tools = array();
 661
 662                 # Rollback and undo links
 663                 if ( $prevRev && $this->getTitle()->quickUserCan( 'edit', $user ) ) {
 664                         if ( $latest && $this->getTitle()->quickUserCan( 'rollback', $user ) ) {
 665                                 // Get a rollback link without the brackets
 666                                 $rollbackLink = Linker::generateRollback(
 667                                         $rev,
 668                                         $this->getContext(),
 669                                         array( 'verify', 'noBrackets' )
 670                                 );
 671                                 if ( $rollbackLink ) {
 672                                         $this->preventClickjacking();
 673                                         $tools[] = $rollbackLink;
 674                                 }
 675                         }
 676
 677                         if ( !$rev->isDeleted( Revision::DELETED_TEXT )
 678                                 && !$prevRev->isDeleted( Revision::DELETED_TEXT )
 679                         ) {
 680                                 # Create undo tooltip for the first (=latest) line only
 681                                 $undoTooltip = $latest
 682                                         ? array( 'title' => $this->msg( 'tooltip-undo' )->text() )
 683                                         : array();
 684                                 $undolink = Linker::linkKnown(
 685                                         $this->getTitle(),
 686                                         $this->msg( 'editundo' )->escaped(),
 687                                         $undoTooltip,
 688                                         array(
 689                                                 'action' => 'edit',
 690                                                 'undoafter' => $prevRev->getId(),
 691                                                 'undo' => $rev->getId()
 692                                         )
 693                                 );
 694                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 695                         }
 696                 }
 697                 // Allow extension to add their own links here
 698                 wfRunHooks( 'HistoryRevisionTools', array( $rev, &$tools ) );
 699
 700                 if ( $tools ) {
 701                         $s2 .= ' ' . $this->msg( 'parentheses' )->rawParams( $lang->pipeList( $tools ) )->escaped();
 702                 }
 703
 704                 # Tags
 705                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 706                 $classes = array_merge( $classes, $newClasses );
 707                 if ( $tagSummary !== '' ) {
 708                         $s2 .= " $tagSummary";
 709                 }
 710
 711                 # Include separator between character difference and following text
 712                 if ( $s2 !== '' ) {
 713                         $s .= ' <span class="mw-changeslist-separator">. .</span> ' . $s2;
 714                 }
 715
 716                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row, &$s, &$classes ) );
 717
 718                 $attribs = array();
 719                 if ( $classes ) {
 720                         $attribs['class'] = implode( ' ', $classes );
 721                 }
 722
 723                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 724         }
 725
 726         /**
 727          * Create a link to view this revision of the page
 728          *
 729          * @param Revision $rev
 730          * @return string
 731          */
 732         function revLink( $rev ) {
 733                 $date = $this->getLanguage()->userTimeAndDate( $rev->getTimestamp(), $this->getUser() );
 734                 $date = htmlspecialchars( $date );
 735                 if ( $rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 736                         $link = Linker::linkKnown(
 737                                 $this->getTitle(),
 738                                 $date,
 739                                 array( 'class' => 'mw-changeslist-date' ),
 740                                 array( 'oldid' => $rev->getId() )
 741                         );
 742                 } else {
 743                         $link = $date;
 744                 }
 745                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 746                         $link = "<span class=\"history-deleted\">$link</span>";
 747                 }
 748
 749                 return $link;
 750         }
 751
 752         /**
 753          * Create a diff-to-current link for this revision for this page
 754          *
 755          * @param Revision $rev
 756          * @param bool $latest This is the latest revision of the page?
 757          * @return string
 758          */
 759         function curLink( $rev, $latest ) {
 760                 $cur = $this->historyPage->message['cur'];
 761                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 762                         return $cur;
 763                 } else {
 764                         return Linker::linkKnown(
 765                                 $this->getTitle(),
 766                                 $cur,
 767                                 array(),
 768                                 array(
 769                                         'diff' => $this->getWikiPage()->getLatest(),
 770                                         'oldid' => $rev->getId()
 771                                 )
 772                         );
 773                 }
 774         }
 775
 776         /**
 777          * Create a diff-to-previous link for this revision for this page.
 778          *
 779          * @param Revision $prevRev The previous revision
 780          * @param mixed $next The newer revision
 781          * @return string
 782          */
 783         function lastLink( $prevRev, $next ) {
 784                 $last = $this->historyPage->message['last'];
 785                 # $next may either be a Row, null, or "unkown"
 786                 $nextRev = is_object( $next ) ? new Revision( $next ) : $next;
 787                 if ( is_null( $next ) ) {
 788                         # Probably no next row
 789                         return $last;
 790                 } elseif ( $next === 'unknown' ) {
 791                         # Next row probably exists but is unknown, use an oldid=prev link
 792                         return Linker::linkKnown(
 793                                 $this->getTitle(),
 794                                 $last,
 795                                 array(),
 796                                 array(
 797                                         'diff' => $prevRev->getId(),
 798                                         'oldid' => 'prev'
 799                                 )
 800                         );
 801                 } elseif ( !$prevRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 802                         || !$nextRev->userCan( Revision::DELETED_TEXT, $this->getUser() )
 803                 ) {
 804                         return $last;
 805                 } else {
 806                         return Linker::linkKnown(
 807                                 $this->getTitle(),
 808                                 $last,
 809                                 array(),
 810                                 array(
 811                                         'diff' => $prevRev->getId(),
 812                                         'oldid' => $next->rev_id
 813                                 )
 814                         );
 815                 }
 816         }
 817
 818         /**
 819          * Create radio buttons for page history
 820          *
 821          * @param Revision $rev
 822          * @param bool $firstInList Is this version the first one?
 823          *
 824          * @return string HTML output for the radio buttons
 825          */
 826         function diffButtons( $rev, $firstInList ) {
 827                 if ( $this->getNumRows() > 1 ) {
 828                         $id = $rev->getId();
 829                         $radio = array( 'type' => 'radio', 'value' => $id );
 830                         /** @todo Move title texts to javascript */
 831                         if ( $firstInList ) {
 832                                 $first = Xml::element( 'input',
 833                                         array_merge( $radio, array(
 834                                                 'style' => 'visibility:hidden',
 835                                                 'name' => 'oldid',
 836                                                 'id' => 'mw-oldid-null' ) )
 837                                 );
 838                                 $checkmark = array( 'checked' => 'checked' );
 839                         } else {
 840                                 # Check visibility of old revisions
 841                                 if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 842                                         $radio['disabled'] = 'disabled';
 843                                         $checkmark = array(); // We will check the next possible one
 844                                 } elseif ( !$this->oldIdChecked ) {
 845                                         $checkmark = array( 'checked' => 'checked' );
 846                                         $this->oldIdChecked = $id;
 847                                 } else {
 848                                         $checkmark = array();
 849                                 }
 850                                 $first = Xml::element( 'input',
 851                                         array_merge( $radio, $checkmark, array(
 852                                                 'name' => 'oldid',
 853                                                 'id' => "mw-oldid-$id" ) ) );
 854                                 $checkmark = array();
 855                         }
 856                         $second = Xml::element( 'input',
 857                                 array_merge( $radio, $checkmark, array(
 858                                         'name' => 'diff',
 859                                         'id' => "mw-diff-$id" ) ) );
 860
 861                         return $first . $second;
 862                 } else {
 863                         return '';
 864                 }
 865         }
 866
 867         /**
 868          * This is called if a write operation is possible from the generated HTML
 869          */
 870         function preventClickjacking( $enable = true ) {
 871                 $this->preventClickjacking = $enable;
 872         }
 873
 874         /**
 875          * Get the "prevent clickjacking" flag
 876          * @return bool
 877          */
 878         function getPreventClickjacking() {
 879                 return $this->preventClickjacking;
 880         }
 881 }
 882
 883 /**
 884  * Backwards-compatibility alias
 885  */
 886 class HistoryPage extends HistoryAction {
 887         // @codingStandardsIgnoreStart Needed "useless" override to make it public.
 888         public function __construct( Page $article ) {
 889                 parent::__construct( $article );
 890         }
 891         // @codingStandardsIgnoreEnd
 892
 893         public function history() {
 894                 $this->onView();
 895         }
 896 }