includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo Move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  */
  34 class Article implements Page {
  35         /** @var IContextSource The context this Article is executed in */
  36         protected $mContext;
  37
  38         /** @var WikiPage The WikiPage object of this instance */
  39         protected $mPage;
  40
  41         /** @var ParserOptions ParserOptions object for $wgUser articles */
  42         public $mParserOptions;
  43
  44         /**
  45          * @var string Text of the revision we are working on
  46          * @todo BC cruft
  47          */
  48         public $mContent;
  49
  50         /**
  51          * @var Content Content of the revision we are working on
  52          * @since 1.21
  53          */
  54         public $mContentObject;
  55
  56         /** @var bool Is the content ($mContent) already loaded? */
  57         public $mContentLoaded = false;
  58
  59         /** @var int|null The oldid of the article that is to be shown, 0 for the current revision */
  60         public $mOldId;
  61
  62         /** @var Title Title from which we were redirected here */
  63         public $mRedirectedFrom = null;
  64
  65         /** @var string|bool URL to redirect to or false if none */
  66         public $mRedirectUrl = false;
  67
  68         /** @var int Revision ID of revision we are working on */
  69         public $mRevIdFetched = 0;
  70
  71         /** @var Revision Revision we are working on */
  72         public $mRevision = null;
  73
  74         /** @var ParserOutput */
  75         public $mParserOutput;
  76
  77         /**
  78          * Constructor and clear the article
  79          * @param Title $title Reference to a Title object.
  80          * @param int $oldId Revision ID, null to fetch from request, zero for current
  81          */
  82         public function __construct( Title $title, $oldId = null ) {
  83                 $this->mOldId = $oldId;
  84                 $this->mPage = $this->newPage( $title );
  85         }
  86
  87         /**
  88          * @param Title $title
  89          * @return WikiPage
  90          */
  91         protected function newPage( Title $title ) {
  92                 return new WikiPage( $title );
  93         }
  94
  95         /**
  96          * Constructor from a page id
  97          * @param int $id Article ID to load
  98          * @return Article|null
  99          */
 100         public static function newFromID( $id ) {
 101                 $t = Title::newFromID( $id );
 102                 # @todo FIXME: Doesn't inherit right
 103                 return $t == null ? null : new self( $t );
 104                 # return $t == null ? null : new static( $t ); // PHP 5.3
 105         }
 106
 107         /**
 108          * Create an Article object of the appropriate class for the given page.
 109          *
 110          * @param Title $title
 111          * @param IContextSource $context
 112          * @return Article
 113          */
 114         public static function newFromTitle( $title, IContextSource $context ) {
 115                 if ( NS_MEDIA == $title->getNamespace() ) {
 116                         // FIXME: where should this go?
 117                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 118                 }
 119
 120                 $page = null;
 121                 Hooks::run( 'ArticleFromTitle', array( &$title, &$page, $context ) );
 122                 if ( !$page ) {
 123                         switch ( $title->getNamespace() ) {
 124                                 case NS_FILE:
 125                                         $page = new ImagePage( $title );
 126                                         break;
 127                                 case NS_CATEGORY:
 128                                         $page = new CategoryPage( $title );
 129                                         break;
 130                                 default:
 131                                         $page = new Article( $title );
 132                         }
 133                 }
 134                 $page->setContext( $context );
 135
 136                 return $page;
 137         }
 138
 139         /**
 140          * Create an Article object of the appropriate class for the given page.
 141          *
 142          * @param WikiPage $page
 143          * @param IContextSource $context
 144          * @return Article
 145          */
 146         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 147                 $article = self::newFromTitle( $page->getTitle(), $context );
 148                 $article->mPage = $page; // override to keep process cached vars
 149                 return $article;
 150         }
 151
 152         /**
 153          * Tell the page view functions that this view was redirected
 154          * from another page on the wiki.
 155          * @param Title $from
 156          */
 157         public function setRedirectedFrom( Title $from ) {
 158                 $this->mRedirectedFrom = $from;
 159         }
 160
 161         /**
 162          * Get the title object of the article
 163          *
 164          * @return Title Title object of this page
 165          */
 166         public function getTitle() {
 167                 return $this->mPage->getTitle();
 168         }
 169
 170         /**
 171          * Get the WikiPage object of this instance
 172          *
 173          * @since 1.19
 174          * @return WikiPage
 175          */
 176         public function getPage() {
 177                 return $this->mPage;
 178         }
 179
 180         /**
 181          * Clear the object
 182          */
 183         public function clear() {
 184                 $this->mContentLoaded = false;
 185
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRevIdFetched = 0;
 188                 $this->mRedirectUrl = false;
 189
 190                 $this->mPage->clear();
 191         }
 192
 193         /**
 194          * Note that getContent/loadContent do not follow redirects anymore.
 195          * If you need to fetch redirectable content easily, try
 196          * the shortcut in WikiPage::getRedirectTarget()
 197          *
 198          * This function has side effects! Do not use this function if you
 199          * only want the real revision text if any.
 200          *
 201          * @deprecated since 1.21; use WikiPage::getContent() instead
 202          *
 203          * @return string Return the text of this revision
 204          */
 205         public function getContent() {
 206                 ContentHandler::deprecated( __METHOD__, '1.21' );
 207                 $content = $this->getContentObject();
 208                 return ContentHandler::getContentText( $content );
 209         }
 210
 211         /**
 212          * Returns a Content object representing the pages effective display content,
 213          * not necessarily the revision's content!
 214          *
 215          * Note that getContent/loadContent do not follow redirects anymore.
 216          * If you need to fetch redirectable content easily, try
 217          * the shortcut in WikiPage::getRedirectTarget()
 218          *
 219          * This function has side effects! Do not use this function if you
 220          * only want the real revision text if any.
 221          *
 222          * @return Content Return the content of this revision
 223          *
 224          * @since 1.21
 225          */
 226         protected function getContentObject() {
 227
 228                 if ( $this->mPage->getID() === 0 ) {
 229                         # If this is a MediaWiki:x message, then load the messages
 230                         # and return the message value for x.
 231                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 232                                 $text = $this->getTitle()->getDefaultMessageText();
 233                                 if ( $text === false ) {
 234                                         $text = '';
 235                                 }
 236
 237                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 238                         } else {
 239                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 240                                 $content = new MessageContent( $message, null, 'parsemag' );
 241                         }
 242                 } else {
 243                         $this->fetchContentObject();
 244                         $content = $this->mContentObject;
 245                 }
 246
 247                 return $content;
 248         }
 249
 250         /**
 251          * @return int The oldid of the article that is to be shown, 0 for the current revision
 252          */
 253         public function getOldID() {
 254                 if ( is_null( $this->mOldId ) ) {
 255                         $this->mOldId = $this->getOldIDFromRequest();
 256                 }
 257
 258                 return $this->mOldId;
 259         }
 260
 261         /**
 262          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 263          *
 264          * @return int The old id for the request
 265          */
 266         public function getOldIDFromRequest() {
 267                 $this->mRedirectUrl = false;
 268
 269                 $request = $this->getContext()->getRequest();
 270                 $oldid = $request->getIntOrNull( 'oldid' );
 271
 272                 if ( $oldid === null ) {
 273                         return 0;
 274                 }
 275
 276                 if ( $oldid !== 0 ) {
 277                         # Load the given revision and check whether the page is another one.
 278                         # In that case, update this instance to reflect the change.
 279                         if ( $oldid === $this->mPage->getLatest() ) {
 280                                 $this->mRevision = $this->mPage->getRevision();
 281                         } else {
 282                                 $this->mRevision = Revision::newFromId( $oldid );
 283                                 if ( $this->mRevision !== null ) {
 284                                         // Revision title doesn't match the page title given?
 285                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 286                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 287                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 288                                         }
 289                                 }
 290                         }
 291                 }
 292
 293                 if ( $request->getVal( 'direction' ) == 'next' ) {
 294                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 295                         if ( $nextid ) {
 296                                 $oldid = $nextid;
 297                                 $this->mRevision = null;
 298                         } else {
 299                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 300                         }
 301                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 302                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 303                         if ( $previd ) {
 304                                 $oldid = $previd;
 305                                 $this->mRevision = null;
 306                         }
 307                 }
 308
 309                 return $oldid;
 310         }
 311
 312         /**
 313          * Load the revision (including text) into this object
 314          *
 315          * @deprecated since 1.19; use fetchContent()
 316          */
 317         function loadContent() {
 318                 wfDeprecated( __METHOD__, '1.19' );
 319                 $this->fetchContent();
 320         }
 321
 322         /**
 323          * Get text of an article from database
 324          * Does *NOT* follow redirects.
 325          *
 326          * @protected
 327          * @note This is really internal functionality that should really NOT be
 328          * used by other functions. For accessing article content, use the WikiPage
 329          * class, especially WikiBase::getContent(). However, a lot of legacy code
 330          * uses this method to retrieve page text from the database, so the function
 331          * has to remain public for now.
 332          *
 333          * @return string|bool String containing article contents, or false if null
 334          * @deprecated since 1.21, use WikiPage::getContent() instead
 335          */
 336         function fetchContent() {
 337                 // BC cruft!
 338
 339                 ContentHandler::deprecated( __METHOD__, '1.21' );
 340
 341                 if ( $this->mContentLoaded && $this->mContent ) {
 342                         return $this->mContent;
 343                 }
 344
 345                 $content = $this->fetchContentObject();
 346
 347                 if ( !$content ) {
 348                         return false;
 349                 }
 350
 351                 // @todo Get rid of mContent everywhere!
 352                 $this->mContent = ContentHandler::getContentText( $content );
 353                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 354
 355                 return $this->mContent;
 356         }
 357
 358         /**
 359          * Get text content object
 360          * Does *NOT* follow redirects.
 361          * @todo When is this null?
 362          *
 363          * @note Code that wants to retrieve page content from the database should
 364          * use WikiPage::getContent().
 365          *
 366          * @return Content|null|bool
 367          *
 368          * @since 1.21
 369          */
 370         protected function fetchContentObject() {
 371                 if ( $this->mContentLoaded ) {
 372                         return $this->mContentObject;
 373                 }
 374
 375                 $this->mContentLoaded = true;
 376                 $this->mContent = null;
 377
 378                 $oldid = $this->getOldID();
 379
 380                 # Pre-fill content with error message so that if something
 381                 # fails we'll have something telling us what we intended.
 382                 //XXX: this isn't page content but a UI message. horrible.
 383                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ) );
 384
 385                 if ( $oldid ) {
 386                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 387                         if ( !$this->mRevision ) {
 388                                 $this->mRevision = Revision::newFromId( $oldid );
 389                                 if ( !$this->mRevision ) {
 390                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 391                                         return false;
 392                                 }
 393                         }
 394                 } else {
 395                         $oldid = $this->mPage->getLatest();
 396                         if ( !$oldid ) {
 397                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 398                                         $this->getTitle()->getPrefixedText() . "\n" );
 399                                 return false;
 400                         }
 401
 402                         # Update error message with correct oldid
 403                         $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ) );
 404
 405                         $this->mRevision = $this->mPage->getRevision();
 406
 407                         if ( !$this->mRevision ) {
 408                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id $oldid\n" );
 409                                 return false;
 410                         }
 411                 }
 412
 413                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 414                 // We should instead work with the Revision object when we need it...
 415                 // Loads if user is allowed
 416                 $content = $this->mRevision->getContent(
 417                         Revision::FOR_THIS_USER,
 418                         $this->getContext()->getUser()
 419                 );
 420
 421                 if ( !$content ) {
 422                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 423                                 $this->mRevision->getId() . "\n" );
 424                         return false;
 425                 }
 426
 427                 $this->mContentObject = $content;
 428                 $this->mRevIdFetched = $this->mRevision->getId();
 429
 430                 Hooks::run( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 431
 432                 return $this->mContentObject;
 433         }
 434
 435         /**
 436          * Returns true if the currently-referenced revision is the current edit
 437          * to this page (and it exists).
 438          * @return bool
 439          */
 440         public function isCurrent() {
 441                 # If no oldid, this is the current version.
 442                 if ( $this->getOldID() == 0 ) {
 443                         return true;
 444                 }
 445
 446                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 447         }
 448
 449         /**
 450          * Get the fetched Revision object depending on request parameters or null
 451          * on failure.
 452          *
 453          * @since 1.19
 454          * @return Revision|null
 455          */
 456         public function getRevisionFetched() {
 457                 $this->fetchContentObject();
 458
 459                 return $this->mRevision;
 460         }
 461
 462         /**
 463          * Use this to fetch the rev ID used on page views
 464          *
 465          * @return int Revision ID of last article revision
 466          */
 467         public function getRevIdFetched() {
 468                 if ( $this->mRevIdFetched ) {
 469                         return $this->mRevIdFetched;
 470                 } else {
 471                         return $this->mPage->getLatest();
 472                 }
 473         }
 474
 475         /**
 476          * This is the default action of the index.php entry point: just view the
 477          * page of the given title.
 478          */
 479         public function view() {
 480                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar, $wgMaxRedirects;
 481
 482                 # Get variables from query string
 483                 # As side effect this will load the revision and update the title
 484                 # in a revision ID is passed in the request, so this should remain
 485                 # the first call of this method even if $oldid is used way below.
 486                 $oldid = $this->getOldID();
 487
 488                 $user = $this->getContext()->getUser();
 489                 # Another whitelist check in case getOldID() is altering the title
 490                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 491                 if ( count( $permErrors ) ) {
 492                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 493                         throw new PermissionsError( 'read', $permErrors );
 494                 }
 495
 496                 $outputPage = $this->getContext()->getOutput();
 497                 # getOldID() may as well want us to redirect somewhere else
 498                 if ( $this->mRedirectUrl ) {
 499                         $outputPage->redirect( $this->mRedirectUrl );
 500                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 501
 502                         return;
 503                 }
 504
 505                 # If we got diff in the query, we want to see a diff page instead of the article.
 506                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 507                         wfDebug( __METHOD__ . ": showing diff page\n" );
 508                         $this->showDiffPage();
 509
 510                         return;
 511                 }
 512
 513                 # Set page title (may be overridden by DISPLAYTITLE)
 514                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 515
 516                 $outputPage->setArticleFlag( true );
 517                 # Allow frames by default
 518                 $outputPage->allowClickjacking();
 519
 520                 $parserCache = ParserCache::singleton();
 521
 522                 $parserOptions = $this->getParserOptions();
 523                 # Render printable version, use printable version cache
 524                 if ( $outputPage->isPrintable() ) {
 525                         $parserOptions->setIsPrintable( true );
 526                         $parserOptions->setEditSection( false );
 527                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 528                         $parserOptions->setEditSection( false );
 529                 }
 530
 531                 # Try client and file cache
 532                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 533                         if ( $wgUseETag ) {
 534                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 535                         }
 536
 537                         # Use the greatest of the page's timestamp or the timestamp of any
 538                         # redirect in the chain (bug 67849)
 539                         $timestamp = $this->mPage->getTouched();
 540                         if ( isset( $this->mRedirectedFrom ) ) {
 541                                 $timestamp = max( $timestamp, $this->mRedirectedFrom->getTouched() );
 542
 543                                 # If there can be more than one redirect in the chain, we have
 544                                 # to go through the whole chain too in case an intermediate
 545                                 # redirect was changed.
 546                                 if ( $wgMaxRedirects > 1 ) {
 547                                         $titles = Revision::newFromTitle( $this->mRedirectedFrom )
 548                                                 ->getContent( Revision::FOR_THIS_USER, $user )
 549                                                 ->getRedirectChain();
 550                                         $thisTitle = $this->getTitle();
 551                                         foreach ( $titles as $title ) {
 552                                                 if ( Title::compare( $title, $thisTitle ) === 0 ) {
 553                                                         break;
 554                                                 }
 555                                                 $timestamp = max( $timestamp, $title->getTouched() );
 556                                         }
 557                                 }
 558                         }
 559
 560                         # Is it client cached?
 561                         if ( $outputPage->checkLastModified( $timestamp ) ) {
 562                                 wfDebug( __METHOD__ . ": done 304\n" );
 563
 564                                 return;
 565                         # Try file cache
 566                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 567                                 wfDebug( __METHOD__ . ": done file cache\n" );
 568                                 # tell wgOut that output is taken care of
 569                                 $outputPage->disable();
 570                                 $this->mPage->doViewUpdates( $user, $oldid );
 571
 572                                 return;
 573                         }
 574                 }
 575
 576                 # Should the parser cache be used?
 577                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 578                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 579                 if ( $user->getStubThreshold() ) {
 580                         $this->getContext()->getStats()->increment( 'pcache_miss_stub' );
 581                 }
 582
 583                 $this->showRedirectedFromHeader();
 584                 $this->showNamespaceHeader();
 585
 586                 # Iterate through the possible ways of constructing the output text.
 587                 # Keep going until $outputDone is set, or we run out of things to do.
 588                 $pass = 0;
 589                 $outputDone = false;
 590                 $this->mParserOutput = false;
 591
 592                 while ( !$outputDone && ++$pass ) {
 593                         switch ( $pass ) {
 594                                 case 1:
 595                                         Hooks::run( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 596                                         break;
 597                                 case 2:
 598                                         # Early abort if the page doesn't exist
 599                                         if ( !$this->mPage->exists() ) {
 600                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 601                                                 $this->showMissingArticle();
 602                                                 $this->mPage->doViewUpdates( $user );
 603                                                 return;
 604                                         }
 605
 606                                         # Try the parser cache
 607                                         if ( $useParserCache ) {
 608                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 609
 610                                                 if ( $this->mParserOutput !== false ) {
 611                                                         if ( $oldid ) {
 612                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 613                                                                 $this->setOldSubtitle( $oldid );
 614                                                         } else {
 615                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 616                                                         }
 617                                                         $outputPage->addParserOutput( $this->mParserOutput );
 618                                                         # Ensure that UI elements requiring revision ID have
 619                                                         # the correct version information.
 620                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 621                                                         # Preload timestamp to avoid a DB hit
 622                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 623                                                         if ( $cachedTimestamp !== null ) {
 624                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 625                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 626                                                         }
 627                                                         $outputDone = true;
 628                                                 }
 629                                         }
 630                                         break;
 631                                 case 3:
 632                                         # This will set $this->mRevision if needed
 633                                         $this->fetchContentObject();
 634
 635                                         # Are we looking at an old revision
 636                                         if ( $oldid && $this->mRevision ) {
 637                                                 $this->setOldSubtitle( $oldid );
 638
 639                                                 if ( !$this->showDeletedRevisionHeader() ) {
 640                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 641                                                         return;
 642                                                 }
 643                                         }
 644
 645                                         # Ensure that UI elements requiring revision ID have
 646                                         # the correct version information.
 647                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 648                                         # Preload timestamp to avoid a DB hit
 649                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 650
 651                                         # Pages containing custom CSS or JavaScript get special treatment
 652                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 653                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 654                                                 $this->showCssOrJsPage();
 655                                                 $outputDone = true;
 656                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 657                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 658
 659                                                 # Allow extensions do their own custom view for certain pages
 660                                                 $outputDone = true;
 661                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 662                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 663
 664                                                 # Allow extensions do their own custom view for certain pages
 665                                                 $outputDone = true;
 666                                         }
 667                                         break;
 668                                 case 4:
 669                                         # Run the parse, protected by a pool counter
 670                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 671
 672                                         $content = $this->getContentObject();
 673                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 674                                                 $this->getRevIdFetched(), $useParserCache, $content );
 675
 676                                         if ( !$poolArticleView->execute() ) {
 677                                                 $error = $poolArticleView->getError();
 678                                                 if ( $error ) {
 679                                                         $outputPage->clearHTML(); // for release() errors
 680                                                         $outputPage->enableClientCache( false );
 681                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 682
 683                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 684                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 685                                                 }
 686                                                 # Connection or timeout error
 687                                                 return;
 688                                         }
 689
 690                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 691                                         $outputPage->addParserOutput( $this->mParserOutput );
 692                                         if ( $content->getRedirectTarget() ) {
 693                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 694                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 695                                         }
 696
 697                                         # Don't cache a dirty ParserOutput object
 698                                         if ( $poolArticleView->getIsDirty() ) {
 699                                                 $outputPage->setSquidMaxage( 0 );
 700                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 701                                                         "sending anyway due to pool overload-->\n" );
 702                                         }
 703
 704                                         $outputDone = true;
 705                                         break;
 706                                 # Should be unreachable, but just in case...
 707                                 default:
 708                                         break 2;
 709                         }
 710                 }
 711
 712                 # Get the ParserOutput actually *displayed* here.
 713                 # Note that $this->mParserOutput is the *current*/oldid version output.
 714                 $pOutput = ( $outputDone instanceof ParserOutput )
 715                         ? $outputDone // object fetched by hook
 716                         : $this->mParserOutput;
 717
 718                 # Adjust title for main page & pages with displaytitle
 719                 if ( $pOutput ) {
 720                         $this->adjustDisplayTitle( $pOutput );
 721                 }
 722
 723                 # For the main page, overwrite the <title> element with the con-
 724                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 725                 # that's not empty).
 726                 # This message always exists because it is in the i18n files
 727                 if ( $this->getTitle()->isMainPage() ) {
 728                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 729                         if ( !$msg->isDisabled() ) {
 730                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 731                         }
 732                 }
 733
 734                 # Check for any __NOINDEX__ tags on the page using $pOutput
 735                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 736                 $outputPage->setIndexPolicy( $policy['index'] );
 737                 $outputPage->setFollowPolicy( $policy['follow'] );
 738
 739                 $this->showViewFooter();
 740                 $this->mPage->doViewUpdates( $user, $oldid );
 741
 742                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 743
 744         }
 745
 746         /**
 747          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 748          * @param ParserOutput $pOutput
 749          */
 750         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 751                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 752                 $titleText = $pOutput->getTitleText();
 753                 if ( strval( $titleText ) !== '' ) {
 754                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 755                 }
 756         }
 757
 758         /**
 759          * Show a diff page according to current request variables. For use within
 760          * Article::view() only, other callers should use the DifferenceEngine class.
 761          *
 762          */
 763         protected function showDiffPage() {
 764                 $request = $this->getContext()->getRequest();
 765                 $user = $this->getContext()->getUser();
 766                 $diff = $request->getVal( 'diff' );
 767                 $rcid = $request->getVal( 'rcid' );
 768                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 769                 $purge = $request->getVal( 'action' ) == 'purge';
 770                 $unhide = $request->getInt( 'unhide' ) == 1;
 771                 $oldid = $this->getOldID();
 772
 773                 $rev = $this->getRevisionFetched();
 774
 775                 if ( !$rev ) {
 776                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 777                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 778                                 ->params( $oldid )
 779                                 ->numParams( 1 )
 780                                 ->parseAsBlock();
 781                         $this->getContext()->getOutput()->addHtml( $msg );
 782                         return;
 783                 }
 784
 785                 $contentHandler = $rev->getContentHandler();
 786                 $de = $contentHandler->createDifferenceEngine(
 787                         $this->getContext(),
 788                         $oldid,
 789                         $diff,
 790                         $rcid,
 791                         $purge,
 792                         $unhide
 793                 );
 794
 795                 // DifferenceEngine directly fetched the revision:
 796                 $this->mRevIdFetched = $de->mNewid;
 797                 $de->showDiffPage( $diffOnly );
 798
 799                 // Run view updates for the newer revision being diffed (and shown
 800                 // below the diff if not $diffOnly).
 801                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 802                 // New can be false, convert it to 0 - this conveniently means the latest revision
 803                 $this->mPage->doViewUpdates( $user, (int)$new );
 804         }
 805
 806         /**
 807          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 808          * Article::view() only.
 809          *
 810          * This exists mostly to serve the deprecated ShowRawCssJs hook (used to customize these views).
 811          * It has been replaced by the ContentGetParserOutput hook, which lets you do the same but with
 812          * more flexibility.
 813          *
 814          * @param bool $showCacheHint Whether to show a message telling the user
 815          *   to clear the browser cache (default: true).
 816          */
 817         protected function showCssOrJsPage( $showCacheHint = true ) {
 818                 $outputPage = $this->getContext()->getOutput();
 819
 820                 if ( $showCacheHint ) {
 821                         $dir = $this->getContext()->getLanguage()->getDir();
 822                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
 823
 824                         $outputPage->wrapWikiMsg(
 825                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 826                                 'clearyourcache'
 827                         );
 828                 }
 829
 830                 $this->fetchContentObject();
 831
 832                 if ( $this->mContentObject ) {
 833                         // Give hooks a chance to customise the output
 834                         if ( ContentHandler::runLegacyHooks(
 835                                 'ShowRawCssJs',
 836                                 array( $this->mContentObject, $this->getTitle(), $outputPage ) )
 837                         ) {
 838                                 // If no legacy hooks ran, display the content of the parser output, including RL modules,
 839                                 // but excluding metadata like categories and language links
 840                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 841                                 $outputPage->addParserOutputContent( $po );
 842                         }
 843                 }
 844         }
 845
 846         /**
 847          * Get the robot policy to be used for the current view
 848          * @param string $action The action= GET parameter
 849          * @param ParserOutput|null $pOutput
 850          * @return array The policy that should be set
 851          * @todo actions other than 'view'
 852          */
 853         public function getRobotPolicy( $action, $pOutput = null ) {
 854                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 855
 856                 $ns = $this->getTitle()->getNamespace();
 857
 858                 # Don't index user and user talk pages for blocked users (bug 11443)
 859                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 860                         $specificTarget = null;
 861                         $vagueTarget = null;
 862                         $titleText = $this->getTitle()->getText();
 863                         if ( IP::isValid( $titleText ) ) {
 864                                 $vagueTarget = $titleText;
 865                         } else {
 866                                 $specificTarget = $titleText;
 867                         }
 868                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 869                                 return array(
 870                                         'index' => 'noindex',
 871                                         'follow' => 'nofollow'
 872                                 );
 873                         }
 874                 }
 875
 876                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 877                         # Non-articles (special pages etc), and old revisions
 878                         return array(
 879                                 'index' => 'noindex',
 880                                 'follow' => 'nofollow'
 881                         );
 882                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 883                         # Discourage indexing of printable versions, but encourage following
 884                         return array(
 885                                 'index' => 'noindex',
 886                                 'follow' => 'follow'
 887                         );
 888                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 889                         # For ?curid=x urls, disallow indexing
 890                         return array(
 891                                 'index' => 'noindex',
 892                                 'follow' => 'follow'
 893                         );
 894                 }
 895
 896                 # Otherwise, construct the policy based on the various config variables.
 897                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 898
 899                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 900                         # Honour customised robot policies for this namespace
 901                         $policy = array_merge(
 902                                 $policy,
 903                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 904                         );
 905                 }
 906                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 907                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 908                         # a final sanity check that we have really got the parser output.
 909                         $policy = array_merge(
 910                                 $policy,
 911                                 array( 'index' => $pOutput->getIndexPolicy() )
 912                         );
 913                 }
 914
 915                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 916                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 917                         $policy = array_merge(
 918                                 $policy,
 919                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 920                         );
 921                 }
 922
 923                 return $policy;
 924         }
 925
 926         /**
 927          * Converts a String robot policy into an associative array, to allow
 928          * merging of several policies using array_merge().
 929          * @param array|string $policy Returns empty array on null/false/'', transparent
 930          *   to already-converted arrays, converts string.
 931          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 932          */
 933         public static function formatRobotPolicy( $policy ) {
 934                 if ( is_array( $policy ) ) {
 935                         return $policy;
 936                 } elseif ( !$policy ) {
 937                         return array();
 938                 }
 939
 940                 $policy = explode( ',', $policy );
 941                 $policy = array_map( 'trim', $policy );
 942
 943                 $arr = array();
 944                 foreach ( $policy as $var ) {
 945                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 946                                 $arr['index'] = $var;
 947                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 948                                 $arr['follow'] = $var;
 949                         }
 950                 }
 951
 952                 return $arr;
 953         }
 954
 955         /**
 956          * If this request is a redirect view, send "redirected from" subtitle to
 957          * the output. Returns true if the header was needed, false if this is not
 958          * a redirect view. Handles both local and remote redirects.
 959          *
 960          * @return bool
 961          */
 962         public function showRedirectedFromHeader() {
 963                 global $wgRedirectSources;
 964
 965                 $context = $this->getContext();
 966                 $outputPage = $context->getOutput();
 967                 $request = $context->getRequest();
 968                 $rdfrom = $request->getVal( 'rdfrom' );
 969
 970                 // Construct a URL for the current page view, but with the target title
 971                 $query = $request->getValues();
 972                 unset( $query['rdfrom'] );
 973                 unset( $query['title'] );
 974                 if ( $this->getTitle()->isRedirect() ) {
 975                         // Prevent double redirects
 976                         $query['redirect'] = 'no';
 977                 }
 978                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 979
 980                 if ( isset( $this->mRedirectedFrom ) ) {
 981                         // This is an internally redirected page view.
 982                         // We'll need a backlink to the source page for navigation.
 983                         if ( Hooks::run( 'ArticleViewRedirect', array( &$this ) ) ) {
 984                                 $redir = Linker::linkKnown(
 985                                         $this->mRedirectedFrom,
 986                                         null,
 987                                         array(),
 988                                         array( 'redirect' => 'no' )
 989                                 );
 990
 991                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 992                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 993                                 . "</span>" );
 994
 995                                 // Add the script to update the displayed URL and
 996                                 // set the fragment if one was specified in the redirect
 997                                 $outputPage->addJsConfigVars( array(
 998                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 999                                 ) );
1000                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1001
1002                                 // Add a <link rel="canonical"> tag
1003                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
1004
1005                                 // Tell the output object that the user arrived at this article through a redirect
1006                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1007
1008                                 return true;
1009                         }
1010                 } elseif ( $rdfrom ) {
1011                         // This is an externally redirected view, from some other wiki.
1012                         // If it was reported from a trusted site, supply a backlink.
1013                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1014                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1015                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1016                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1017                                 . "</span>" );
1018
1019                                 // Add the script to update the displayed URL
1020                                 $outputPage->addJsConfigVars( array(
1021                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1022                                 ) );
1023                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1024
1025                                 return true;
1026                         }
1027                 }
1028
1029                 return false;
1030         }
1031
1032         /**
1033          * Show a header specific to the namespace currently being viewed, like
1034          * [[MediaWiki:Talkpagetext]]. For Article::view().
1035          */
1036         public function showNamespaceHeader() {
1037                 if ( $this->getTitle()->isTalkPage() ) {
1038                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1039                                 $this->getContext()->getOutput()->wrapWikiMsg(
1040                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1041                                         array( 'talkpageheader' )
1042                                 );
1043                         }
1044                 }
1045         }
1046
1047         /**
1048          * Show the footer section of an ordinary page view
1049          */
1050         public function showViewFooter() {
1051                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1052                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1053                         && IP::isValid( $this->getTitle()->getText() )
1054                 ) {
1055                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1056                 }
1057
1058                 // Show a footer allowing the user to patrol the shown revision or page if possible
1059                 $patrolFooterShown = $this->showPatrolFooter();
1060
1061                 Hooks::run( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1062         }
1063
1064         /**
1065          * If patrol is possible, output a patrol UI box. This is called from the
1066          * footer section of ordinary page views. If patrol is not possible or not
1067          * desired, does nothing.
1068          * Side effect: When the patrol link is build, this method will call
1069          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1070          *
1071          * @return bool
1072          */
1073         public function showPatrolFooter() {
1074                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1075
1076                 $outputPage = $this->getContext()->getOutput();
1077                 $user = $this->getContext()->getUser();
1078                 $cache = wfGetMainCache();
1079                 $rc = false;
1080
1081                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user )
1082                         || !( $wgUseRCPatrol || $wgUseNPPatrol )
1083                 ) {
1084                         // Patrolling is disabled or the user isn't allowed to
1085                         return false;
1086                 }
1087
1088                 // New page patrol: Get the timestamp of the oldest revison which
1089                 // the revision table holds for the given page. Then we look
1090                 // whether it's within the RC lifespan and if it is, we try
1091                 // to get the recentchanges row belonging to that entry
1092                 // (with rc_new = 1).
1093
1094                 // Check for cached results
1095                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1096                         return false;
1097                 }
1098
1099                 if ( $this->mRevision
1100                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1101                 ) {
1102                         // The current revision is already older than what could be in the RC table
1103                         // 6h tolerance because the RC might not be cleaned out regularly
1104                         return false;
1105                 }
1106
1107                 $dbr = wfGetDB( DB_SLAVE );
1108                 $oldestRevisionTimestamp = $dbr->selectField(
1109                         'revision',
1110                         'MIN( rev_timestamp )',
1111                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1112                         __METHOD__
1113                 );
1114
1115                 if ( $oldestRevisionTimestamp
1116                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1117                 ) {
1118                         // 6h tolerance because the RC might not be cleaned out regularly
1119                         $rc = RecentChange::newFromConds(
1120                                 array(
1121                                         'rc_new' => 1,
1122                                         'rc_timestamp' => $oldestRevisionTimestamp,
1123                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1124                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1125                                         'rc_patrolled' => 0
1126                                 ),
1127                                 __METHOD__,
1128                                 array( 'USE INDEX' => 'new_name_timestamp' )
1129                         );
1130                 }
1131
1132                 if ( !$rc ) {
1133                         // No RC entry around
1134
1135                         // Cache the information we gathered above in case we can't patrol
1136                         // Don't cache in case we can patrol as this could change
1137                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1138
1139                         return false;
1140                 }
1141
1142                 if ( $rc->getPerformer()->equals( $user ) ) {
1143                         // Don't show a patrol link for own creations. If the user could
1144                         // patrol them, they already would be patrolled
1145                         return false;
1146                 }
1147
1148                 $rcid = $rc->getAttribute( 'rc_id' );
1149
1150                 $token = $user->getEditToken( $rcid );
1151
1152                 $outputPage->preventClickjacking();
1153                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1154                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1155                 }
1156
1157                 $link = Linker::linkKnown(
1158                         $this->getTitle(),
1159                         wfMessage( 'markaspatrolledtext' )->escaped(),
1160                         array(),
1161                         array(
1162                                 'action' => 'markpatrolled',
1163                                 'rcid' => $rcid,
1164                                 'token' => $token,
1165                         )
1166                 );
1167
1168                 $outputPage->addHTML(
1169                         "<div class='patrollink'>" .
1170                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1171                         '</div>'
1172                 );
1173
1174                 return true;
1175         }
1176
1177         /**
1178          * Show the error text for a missing article. For articles in the MediaWiki
1179          * namespace, show the default message text. To be called from Article::view().
1180          */
1181         public function showMissingArticle() {
1182                 global $wgSend404Code;
1183
1184                 $outputPage = $this->getContext()->getOutput();
1185                 // Whether the page is a root user page of an existing user (but not a subpage)
1186                 $validUserPage = false;
1187
1188                 $title = $this->getTitle();
1189
1190                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1191                 if ( $title->getNamespace() == NS_USER
1192                         || $title->getNamespace() == NS_USER_TALK
1193                 ) {
1194                         $parts = explode( '/', $title->getText() );
1195                         $rootPart = $parts[0];
1196                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1197                         $ip = User::isIP( $rootPart );
1198                         $block = Block::newFromTarget( $user, $user );
1199
1200                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1201                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1202                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1203                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1204                                 # Show log extract if the user is currently blocked
1205                                 LogEventsList::showLogExtract(
1206                                         $outputPage,
1207                                         'block',
1208                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1209                                         '',
1210                                         array(
1211                                                 'lim' => 1,
1212                                                 'showIfEmpty' => false,
1213                                                 'msgKey' => array(
1214                                                         'blocked-notice-logextract',
1215                                                         $user->getName() # Support GENDER in notice
1216                                                 )
1217                                         )
1218                                 );
1219                                 $validUserPage = !$title->isSubpage();
1220                         } else {
1221                                 $validUserPage = !$title->isSubpage();
1222                         }
1223                 }
1224
1225                 Hooks::run( 'ShowMissingArticle', array( $this ) );
1226
1227                 // Give extensions a chance to hide their (unrelated) log entries
1228                 $logTypes = array( 'delete', 'move' );
1229                 $conds = array( "log_action != 'revision'" );
1230                 Hooks::run( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1231
1232                 # Show delete and move logs
1233                 LogEventsList::showLogExtract( $outputPage, $logTypes, $title, '',
1234                         array( 'lim' => 10,
1235                                 'conds' => $conds,
1236                                 'showIfEmpty' => false,
1237                                 'msgKey' => array( 'moveddeleted-notice' ) )
1238                 );
1239
1240                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1241                         // If there's no backing content, send a 404 Not Found
1242                         // for better machine handling of broken links.
1243                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1244                 }
1245
1246                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1247                 $policy = $this->getRobotPolicy( 'view' );
1248                 $outputPage->setIndexPolicy( $policy['index'] );
1249                 $outputPage->setFollowPolicy( $policy['follow'] );
1250
1251                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', array( $this ) );
1252
1253                 if ( !$hookResult ) {
1254                         return;
1255                 }
1256
1257                 # Show error message
1258                 $oldid = $this->getOldID();
1259                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI ) {
1260                         $outputPage->addParserOutput( $this->getContentObject()->getParserOutput( $title ) );
1261                 } else {
1262                         if ( $oldid ) {
1263                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1264                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1265                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1266                         ) {
1267                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1268                                 $text = wfMessage( $message )->plain();
1269                         } else {
1270                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1271                         }
1272
1273                         $outputPage->addWikiText( "<div class='noarticletext'>\n$text\n</div>" );
1274                 }
1275         }
1276
1277         /**
1278          * If the revision requested for view is deleted, check permissions.
1279          * Send either an error message or a warning header to the output.
1280          *
1281          * @return bool True if the view is allowed, false if not.
1282          */
1283         public function showDeletedRevisionHeader() {
1284                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1285                         // Not deleted
1286                         return true;
1287                 }
1288
1289                 $outputPage = $this->getContext()->getOutput();
1290                 $user = $this->getContext()->getUser();
1291                 // If the user is not allowed to see it...
1292                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1293                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1294                                 'rev-deleted-text-permission' );
1295
1296                         return false;
1297                 // If the user needs to confirm that they want to see it...
1298                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1299                         # Give explanation and add a link to view the revision...
1300                         $oldid = intval( $this->getOldID() );
1301                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1302                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1303                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1304                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1305                                 array( $msg, $link ) );
1306
1307                         return false;
1308                 // We are allowed to see...
1309                 } else {
1310                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1311                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1312                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1313
1314                         return true;
1315                 }
1316         }
1317
1318         /**
1319          * Generate the navigation links when browsing through an article revisions
1320          * It shows the information as:
1321          *   Revision as of \<date\>; view current revision
1322          *   \<- Previous version | Next Version -\>
1323          *
1324          * @param int $oldid Revision ID of this article revision
1325          */
1326         public function setOldSubtitle( $oldid = 0 ) {
1327                 if ( !Hooks::run( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1328                         return;
1329                 }
1330
1331                 $context = $this->getContext();
1332                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1333
1334                 # Cascade unhide param in links for easy deletion browsing
1335                 $extraParams = array();
1336                 if ( $unhide ) {
1337                         $extraParams['unhide'] = 1;
1338                 }
1339
1340                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1341                         $revision = $this->mRevision;
1342                 } else {
1343                         $revision = Revision::newFromId( $oldid );
1344                 }
1345
1346                 $timestamp = $revision->getTimestamp();
1347
1348                 $current = ( $oldid == $this->mPage->getLatest() );
1349                 $language = $context->getLanguage();
1350                 $user = $context->getUser();
1351
1352                 $td = $language->userTimeAndDate( $timestamp, $user );
1353                 $tddate = $language->userDate( $timestamp, $user );
1354                 $tdtime = $language->userTime( $timestamp, $user );
1355
1356                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1357                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1358
1359                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1360                         ? 'revision-info-current'
1361                         : 'revision-info';
1362
1363                 $outputPage = $context->getOutput();
1364                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" .
1365                         $context->msg( $infomsg, $td )
1366                                 ->rawParams( $userlinks )
1367                                 ->params( $revision->getID(), $tddate, $tdtime, $revision->getUserText() )
1368                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1369                                 ->parse() .
1370                         "</div>"
1371                 );
1372
1373                 $lnk = $current
1374                         ? $context->msg( 'currentrevisionlink' )->escaped()
1375                         : Linker::linkKnown(
1376                                 $this->getTitle(),
1377                                 $context->msg( 'currentrevisionlink' )->escaped(),
1378                                 array(),
1379                                 $extraParams
1380                         );
1381                 $curdiff = $current
1382                         ? $context->msg( 'diff' )->escaped()
1383                         : Linker::linkKnown(
1384                                 $this->getTitle(),
1385                                 $context->msg( 'diff' )->escaped(),
1386                                 array(),
1387                                 array(
1388                                         'diff' => 'cur',
1389                                         'oldid' => $oldid
1390                                 ) + $extraParams
1391                         );
1392                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1393                 $prevlink = $prev
1394                         ? Linker::linkKnown(
1395                                 $this->getTitle(),
1396                                 $context->msg( 'previousrevision' )->escaped(),
1397                                 array(),
1398                                 array(
1399                                         'direction' => 'prev',
1400                                         'oldid' => $oldid
1401                                 ) + $extraParams
1402                         )
1403                         : $context->msg( 'previousrevision' )->escaped();
1404                 $prevdiff = $prev
1405                         ? Linker::linkKnown(
1406                                 $this->getTitle(),
1407                                 $context->msg( 'diff' )->escaped(),
1408                                 array(),
1409                                 array(
1410                                         'diff' => 'prev',
1411                                         'oldid' => $oldid
1412                                 ) + $extraParams
1413                         )
1414                         : $context->msg( 'diff' )->escaped();
1415                 $nextlink = $current
1416                         ? $context->msg( 'nextrevision' )->escaped()
1417                         : Linker::linkKnown(
1418                                 $this->getTitle(),
1419                                 $context->msg( 'nextrevision' )->escaped(),
1420                                 array(),
1421                                 array(
1422                                         'direction' => 'next',
1423                                         'oldid' => $oldid
1424                                 ) + $extraParams
1425                         );
1426                 $nextdiff = $current
1427                         ? $context->msg( 'diff' )->escaped()
1428                         : Linker::linkKnown(
1429                                 $this->getTitle(),
1430                                 $context->msg( 'diff' )->escaped(),
1431                                 array(),
1432                                 array(
1433                                         'diff' => 'next',
1434                                         'oldid' => $oldid
1435                                 ) + $extraParams
1436                         );
1437
1438                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1439                 if ( $cdel !== '' ) {
1440                         $cdel .= ' ';
1441                 }
1442
1443                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1444                         $context->msg( 'revision-nav' )->rawParams(
1445                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1446                         )->escaped() . "</div>" );
1447         }
1448
1449         /**
1450          * Return the HTML for the top of a redirect page
1451          *
1452          * Chances are you should just be using the ParserOutput from
1453          * WikitextContent::getParserOutput instead of calling this for redirects.
1454          *
1455          * @param Title|array $target Destination(s) to redirect
1456          * @param bool $appendSubtitle [optional]
1457          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1458          * @return string Containing HTML with redirect link
1459          */
1460         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1461                 $lang = $this->getTitle()->getPageLanguage();
1462                 $out = $this->getContext()->getOutput();
1463                 if ( $appendSubtitle ) {
1464                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1465                 }
1466                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1467                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1468         }
1469
1470         /**
1471          * Return the HTML for the top of a redirect page
1472          *
1473          * Chances are you should just be using the ParserOutput from
1474          * WikitextContent::getParserOutput instead of calling this for redirects.
1475          *
1476          * @since 1.23
1477          * @param Language $lang
1478          * @param Title|array $target Destination(s) to redirect
1479          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1480          * @return string Containing HTML with redirect link
1481          */
1482         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1483                 if ( !is_array( $target ) ) {
1484                         $target = array( $target );
1485                 }
1486
1487                 $html = '<ul class="redirectText">';
1488                 /** @var Title $title */
1489                 foreach ( $target as $title ) {
1490                         $html .= '<li>' . Linker::link(
1491                                 $title,
1492                                 htmlspecialchars( $title->getFullText() ),
1493                                 array(),
1494                                 // Automatically append redirect=no to each link, since most of them are
1495                                 // redirect pages themselves.
1496                                 array( 'redirect' => 'no' ),
1497                                 ( $forceKnown ? array( 'known', 'noclasses' ) : array() )
1498                         ) . '</li>';
1499                 }
1500                 $html .= '</ul>';
1501
1502                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1503
1504                 return '<div class="redirectMsg">' .
1505                         '<p>' . $redirectToText . '</p>' .
1506                         $html .
1507                         '</div>';
1508         }
1509
1510         /**
1511          * Adds help link with an icon via page indicators.
1512          * Link target can be overridden by a local message containing a wikilink:
1513          * the message key is: 'namespace-' + namespace number + '-helppage'.
1514          * @param string $to Target MediaWiki.org page title or encoded URL.
1515          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1516          * @since 1.25
1517          */
1518         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1519                 $msg = wfMessage(
1520                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1521                 );
1522
1523                 $out = $this->getContext()->getOutput();
1524                 if ( !$msg->isDisabled() ) {
1525                         $helpUrl = Skin::makeUrl( $msg->plain() );
1526                         $out->addHelpLink( $helpUrl, true );
1527                 } else {
1528                         $out->addHelpLink( $to, $overrideBaseUrl );
1529                 }
1530         }
1531
1532         /**
1533          * Handle action=render
1534          */
1535         public function render() {
1536                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1537                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1538                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1539                 $this->view();
1540         }
1541
1542         /**
1543          * action=protect handler
1544          */
1545         public function protect() {
1546                 $form = new ProtectionForm( $this );
1547                 $form->execute();
1548         }
1549
1550         /**
1551          * action=unprotect handler (alias)
1552          */
1553         public function unprotect() {
1554                 $this->protect();
1555         }
1556
1557         /**
1558          * UI entry point for page deletion
1559          */
1560         public function delete() {
1561                 # This code desperately needs to be totally rewritten
1562
1563                 $title = $this->getTitle();
1564                 $context = $this->getContext();
1565                 $user = $context->getUser();
1566
1567                 # Check permissions
1568                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1569                 if ( count( $permissionErrors ) ) {
1570                         throw new PermissionsError( 'delete', $permissionErrors );
1571                 }
1572
1573                 # Read-only check...
1574                 if ( wfReadOnly() ) {
1575                         throw new ReadOnlyError;
1576                 }
1577
1578                 # Better double-check that it hasn't been deleted yet!
1579                 $this->mPage->loadPageData( 'fromdbmaster' );
1580                 if ( !$this->mPage->exists() ) {
1581                         $deleteLogPage = new LogPage( 'delete' );
1582                         $outputPage = $context->getOutput();
1583                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1584                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1585                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1586                                 );
1587                         $outputPage->addHTML(
1588                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1589                         );
1590                         LogEventsList::showLogExtract(
1591                                 $outputPage,
1592                                 'delete',
1593                                 $title
1594                         );
1595
1596                         return;
1597                 }
1598
1599                 $request = $context->getRequest();
1600                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1601                 $deleteReason = $request->getText( 'wpReason' );
1602
1603                 if ( $deleteReasonList == 'other' ) {
1604                         $reason = $deleteReason;
1605                 } elseif ( $deleteReason != '' ) {
1606                         // Entry from drop down menu + additional comment
1607                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1608                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1609                 } else {
1610                         $reason = $deleteReasonList;
1611                 }
1612
1613                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1614                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1615                 ) {
1616                         # Flag to hide all contents of the archived revisions
1617                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1618
1619                         $this->doDelete( $reason, $suppress );
1620
1621                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1622
1623                         return;
1624                 }
1625
1626                 // Generate deletion reason
1627                 $hasHistory = false;
1628                 if ( !$reason ) {
1629                         try {
1630                                 $reason = $this->generateReason( $hasHistory );
1631                         } catch ( Exception $e ) {
1632                                 # if a page is horribly broken, we still want to be able to
1633                                 # delete it. So be lenient about errors here.
1634                                 wfDebug( "Error while building auto delete summary: $e" );
1635                                 $reason = '';
1636                         }
1637                 }
1638
1639                 // If the page has a history, insert a warning
1640                 if ( $hasHistory ) {
1641                         $title = $this->getTitle();
1642
1643                         // The following can use the real revision count as this is only being shown for users
1644                         // that can delete this page.
1645                         // This, as a side-effect, also makes sure that the following query isn't being run for
1646                         // pages with a larger history, unless the user has the 'bigdelete' right
1647                         // (and is about to delete this page).
1648                         $dbr = wfGetDB( DB_SLAVE );
1649                         $revisions = $edits = (int)$dbr->selectField(
1650                                 'revision',
1651                                 'COUNT(rev_page)',
1652                                 array( 'rev_page' => $title->getArticleID() ),
1653                                 __METHOD__
1654                         );
1655
1656                         // @todo FIXME: i18n issue/patchwork message
1657                         $context->getOutput()->addHTML(
1658                                 '<strong class="mw-delete-warning-revisions">' .
1659                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1660                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1661                                         $context->msg( 'history' )->escaped(),
1662                                         array(),
1663                                         array( 'action' => 'history' ) ) .
1664                                 '</strong>'
1665                         );
1666
1667                         if ( $title->isBigDeletion() ) {
1668                                 global $wgDeleteRevisionsLimit;
1669                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1670                                         array(
1671                                                 'delete-warning-toobig',
1672                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1673                                         )
1674                                 );
1675                         }
1676                 }
1677
1678                 $this->confirmDelete( $reason );
1679         }
1680
1681         /**
1682          * Output deletion confirmation dialog
1683          * @todo FIXME: Move to another file?
1684          * @param string $reason Prefilled reason
1685          */
1686         public function confirmDelete( $reason ) {
1687                 wfDebug( "Article::confirmDelete\n" );
1688
1689                 $title = $this->getTitle();
1690                 $ctx = $this->getContext();
1691                 $outputPage = $ctx->getOutput();
1692                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1693                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1694                 $outputPage->addBacklinkSubtitle( $title );
1695                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1696                 $backlinkCache = $title->getBacklinkCache();
1697                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1698                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1699                                 'deleting-backlinks-warning' );
1700                 }
1701                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1702
1703                 Hooks::run( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1704
1705                 $user = $this->getContext()->getUser();
1706
1707                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1708                         $suppress = Html::openElement( 'div', array( 'id' => 'wpDeleteSuppressRow' ) ) .
1709                                 "<strong>" .
1710                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1711                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1712                                         "</strong>" .
1713                                 Html::closeElement( 'div' );
1714                 } else {
1715                         $suppress = '';
1716                 }
1717                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1718
1719                 $form = Html::openElement( 'form', array( 'method' => 'post',
1720                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1721                         Html::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1722                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1723                         Html::openElement( 'div', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1724                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonListRow' ) ) .
1725                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1726                         '&nbsp;' .
1727                         Xml::listDropDown(
1728                                 'wpDeleteReasonList',
1729                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1730                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1731                                 '',
1732                                 'wpReasonDropDown',
1733                                 1
1734                         ) .
1735                         Html::closeElement( 'div' ) .
1736                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonRow' ) ) .
1737                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1738                         '&nbsp;' .
1739                         Html::input( 'wpReason', $reason, 'text', array(
1740                                 'size' => '60',
1741                                 'maxlength' => '255',
1742                                 'tabindex' => '2',
1743                                 'id' => 'wpReason',
1744                                 'class' => 'mw-ui-input-inline',
1745                                 'autofocus'
1746                         ) ) .
1747                         Html::closeElement( 'div' );
1748
1749                 # Disallow watching if user is not logged in
1750                 if ( $user->isLoggedIn() ) {
1751                         $form .=
1752                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1753                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) );
1754                 }
1755
1756                 $form .=
1757                                 Html::openElement( 'div' ) .
1758                                 $suppress .
1759                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1760                                                 array(
1761                                                         'name' => 'wpConfirmB',
1762                                                         'id' => 'wpConfirmB',
1763                                                         'tabindex' => '5',
1764                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1765                                                 )
1766                                         ) .
1767                                 Html::closeElement( 'div' ) .
1768                         Html::closeElement( 'div' ) .
1769                         Xml::closeElement( 'fieldset' ) .
1770                         Html::hidden(
1771                                 'wpEditToken',
1772                                 $user->getEditToken( array( 'delete', $title->getPrefixedText() ) )
1773                         ) .
1774                         Xml::closeElement( 'form' );
1775
1776                         if ( $user->isAllowed( 'editinterface' ) ) {
1777                                 $link = Linker::linkKnown(
1778                                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
1779                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1780                                         array(),
1781                                         array( 'action' => 'edit' )
1782                                 );
1783                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1784                         }
1785
1786                 $outputPage->addHTML( $form );
1787
1788                 $deleteLogPage = new LogPage( 'delete' );
1789                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1790                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1791         }
1792
1793         /**
1794          * Perform a deletion and output success or failure messages
1795          * @param string $reason
1796          * @param bool $suppress
1797          */
1798         public function doDelete( $reason, $suppress = false ) {
1799                 $error = '';
1800                 $outputPage = $this->getContext()->getOutput();
1801                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1802
1803                 if ( $status->isGood() ) {
1804                         $deleted = $this->getTitle()->getPrefixedText();
1805
1806                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1807                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1808
1809                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1810
1811                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1812
1813                         Hooks::run( 'ArticleDeleteAfterSuccess', array( $this->getTitle(), $outputPage ) );
1814
1815                         $outputPage->returnToMain( false );
1816                 } else {
1817                         $outputPage->setPageTitle(
1818                                 wfMessage( 'cannotdelete-title',
1819                                         $this->getTitle()->getPrefixedText() )
1820                         );
1821
1822                         if ( $error == '' ) {
1823                                 $outputPage->addWikiText(
1824                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1825                                 );
1826                                 $deleteLogPage = new LogPage( 'delete' );
1827                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1828
1829                                 LogEventsList::showLogExtract(
1830                                         $outputPage,
1831                                         'delete',
1832                                         $this->getTitle()
1833                                 );
1834                         } else {
1835                                 $outputPage->addHTML( $error );
1836                         }
1837                 }
1838         }
1839
1840         /* Caching functions */
1841
1842         /**
1843          * checkLastModified returns true if it has taken care of all
1844          * output to the client that is necessary for this request.
1845          * (that is, it has sent a cached version of the page)
1846          *
1847          * @return bool True if cached version send, false otherwise
1848          */
1849         protected function tryFileCache() {
1850                 static $called = false;
1851
1852                 if ( $called ) {
1853                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1854                         return false;
1855                 }
1856
1857                 $called = true;
1858                 if ( $this->isFileCacheable() ) {
1859                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1860                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1861                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1862                                 $cache->loadFromFileCache( $this->getContext() );
1863                                 return true;
1864                         } else {
1865                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1866                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1867                         }
1868                 } else {
1869                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1870                 }
1871
1872                 return false;
1873         }
1874
1875         /**
1876          * Check if the page can be cached
1877          * @return bool
1878          */
1879         public function isFileCacheable() {
1880                 $cacheable = false;
1881
1882                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1883                         $cacheable = $this->mPage->getID()
1884                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1885                         // Extension may have reason to disable file caching on some pages.
1886                         if ( $cacheable ) {
1887                                 $cacheable = Hooks::run( 'IsFileCacheable', array( &$this ) );
1888                         }
1889                 }
1890
1891                 return $cacheable;
1892         }
1893
1894         /**#@-*/
1895
1896         /**
1897          * Lightweight method to get the parser output for a page, checking the parser cache
1898          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1899          * consider, so it's not appropriate to use there.
1900          *
1901          * @since 1.16 (r52326) for LiquidThreads
1902          *
1903          * @param int|null $oldid Revision ID or null
1904          * @param User $user The relevant user
1905          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1906          */
1907         public function getParserOutput( $oldid = null, User $user = null ) {
1908                 //XXX: bypasses mParserOptions and thus setParserOptions()
1909
1910                 if ( $user === null ) {
1911                         $parserOptions = $this->getParserOptions();
1912                 } else {
1913                         $parserOptions = $this->mPage->makeParserOptions( $user );
1914                 }
1915
1916                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1917         }
1918
1919         /**
1920          * Override the ParserOptions used to render the primary article wikitext.
1921          *
1922          * @param ParserOptions $options
1923          * @throws MWException If the parser options where already initialized.
1924          */
1925         public function setParserOptions( ParserOptions $options ) {
1926                 if ( $this->mParserOptions ) {
1927                         throw new MWException( "can't change parser options after they have already been set" );
1928                 }
1929
1930                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1931                 $this->mParserOptions = clone $options;
1932         }
1933
1934         /**
1935          * Get parser options suitable for rendering the primary article wikitext
1936          * @return ParserOptions
1937          */
1938         public function getParserOptions() {
1939                 if ( !$this->mParserOptions ) {
1940                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1941                 }
1942                 // Clone to allow modifications of the return value without affecting cache
1943                 return clone $this->mParserOptions;
1944         }
1945
1946         /**
1947          * Sets the context this Article is executed in
1948          *
1949          * @param IContextSource $context
1950          * @since 1.18
1951          */
1952         public function setContext( $context ) {
1953                 $this->mContext = $context;
1954         }
1955
1956         /**
1957          * Gets the context this Article is executed in
1958          *
1959          * @return IContextSource
1960          * @since 1.18
1961          */
1962         public function getContext() {
1963                 if ( $this->mContext instanceof IContextSource ) {
1964                         return $this->mContext;
1965                 } else {
1966                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1967                                 "Return RequestContext::getMain(); for sanity\n" );
1968                         return RequestContext::getMain();
1969                 }
1970         }
1971
1972         /**
1973          * Use PHP's magic __get handler to handle accessing of
1974          * raw WikiPage fields for backwards compatibility.
1975          *
1976          * @param string $fname Field name
1977          * @return mixed
1978          */
1979         public function __get( $fname ) {
1980                 if ( property_exists( $this->mPage, $fname ) ) {
1981                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1982                         return $this->mPage->$fname;
1983                 }
1984                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1985         }
1986
1987         /**
1988          * Use PHP's magic __set handler to handle setting of
1989          * raw WikiPage fields for backwards compatibility.
1990          *
1991          * @param string $fname Field name
1992          * @param mixed $fvalue New value
1993          */
1994         public function __set( $fname, $fvalue ) {
1995                 if ( property_exists( $this->mPage, $fname ) ) {
1996                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1997                         $this->mPage->$fname = $fvalue;
1998                 // Note: extensions may want to toss on new fields
1999                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
2000                         $this->mPage->$fname = $fvalue;
2001                 } else {
2002                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2003                 }
2004         }
2005
2006         /**
2007          * Use PHP's magic __call handler to transform instance calls to
2008          * WikiPage functions for backwards compatibility.
2009          *
2010          * @param string $fname Name of called method
2011          * @param array $args Arguments to the method
2012          * @return mixed
2013          */
2014         public function __call( $fname, $args ) {
2015                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2016                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2017                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2018                 }
2019                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2020         }
2021
2022         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2023
2024         /**
2025          * @param array $limit
2026          * @param array $expiry
2027          * @param bool $cascade
2028          * @param string $reason
2029          * @param User $user
2030          * @return Status
2031          */
2032         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2033                 $reason, User $user
2034         ) {
2035                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2036         }
2037
2038         /**
2039          * @param array $limit
2040          * @param string $reason
2041          * @param int $cascade
2042          * @param array $expiry
2043          * @return bool
2044          */
2045         public function updateRestrictions( $limit = array(), $reason = '',
2046                 &$cascade = 0, $expiry = array()
2047         ) {
2048                 return $this->mPage->doUpdateRestrictions(
2049                         $limit,
2050                         $expiry,
2051                         $cascade,
2052                         $reason,
2053                         $this->getContext()->getUser()
2054                 );
2055         }
2056
2057         /**
2058          * @param string $reason
2059          * @param bool $suppress
2060          * @param int $id
2061          * @param bool $commit
2062          * @param string $error
2063          * @return bool
2064          */
2065         public function doDeleteArticle( $reason, $suppress = false, $id = 0,
2066                 $commit = true, &$error = ''
2067         ) {
2068                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2069         }
2070
2071         /**
2072          * @param string $fromP
2073          * @param string $summary
2074          * @param string $token
2075          * @param bool $bot
2076          * @param array $resultDetails
2077          * @param User|null $user
2078          * @return array
2079          */
2080         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2081                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2082                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2083         }
2084
2085         /**
2086          * @param string $fromP
2087          * @param string $summary
2088          * @param bool $bot
2089          * @param array $resultDetails
2090          * @param User|null $guser
2091          * @return array
2092          */
2093         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2094                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2095                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2096         }
2097
2098         /**
2099          * @param bool $hasHistory
2100          * @return mixed
2101          */
2102         public function generateReason( &$hasHistory ) {
2103                 $title = $this->mPage->getTitle();
2104                 $handler = ContentHandler::getForTitle( $title );
2105                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2106         }
2107
2108         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2109
2110         /**
2111          * @return array
2112          *
2113          * @deprecated since 1.24, use WikiPage::selectFields() instead
2114          */
2115         public static function selectFields() {
2116                 wfDeprecated( __METHOD__, '1.24' );
2117                 return WikiPage::selectFields();
2118         }
2119
2120         /**
2121          * @param Title $title
2122          *
2123          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2124          */
2125         public static function onArticleCreate( $title ) {
2126                 wfDeprecated( __METHOD__, '1.24' );
2127                 WikiPage::onArticleCreate( $title );
2128         }
2129
2130         /**
2131          * @param Title $title
2132          *
2133          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2134          */
2135         public static function onArticleDelete( $title ) {
2136                 wfDeprecated( __METHOD__, '1.24' );
2137                 WikiPage::onArticleDelete( $title );
2138         }
2139
2140         /**
2141          * @param Title $title
2142          *
2143          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2144          */
2145         public static function onArticleEdit( $title ) {
2146                 wfDeprecated( __METHOD__, '1.24' );
2147                 WikiPage::onArticleEdit( $title );
2148         }
2149
2150         /**
2151          * @param string $oldtext
2152          * @param string $newtext
2153          * @param int $flags
2154          * @return string
2155          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2156          */
2157         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2158                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2159         }
2160         // ******
2161 }