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  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class Article implements Page {
  37         /** @var IContextSource The context this Article is executed in */
  38         protected $mContext;
  39
  40         /** @var WikiPage The WikiPage object of this instance */
  41         protected $mPage;
  42
  43         /** @var ParserOptions ParserOptions object for $wgUser articles */
  44         public $mParserOptions;
  45
  46         /**
  47          * @var string Text of the revision we are working on
  48          * @todo BC cruft
  49          */
  50         public $mContent;
  51
  52         /**
  53          * @var Content Content of the revision we are working on
  54          * @since 1.21
  55          */
  56         protected $mContentObject;
  57
  58         /** @var bool Is the content ($mContent) already loaded? */
  59         protected $mContentLoaded = false;
  60
  61         /** @var int|null The oldid of the article that is to be shown, 0 for the current revision */
  62         protected $mOldId;
  63
  64         /** @var Title Title from which we were redirected here */
  65         protected $mRedirectedFrom = null;
  66
  67         /** @var string|bool URL to redirect to or false if none */
  68         protected $mRedirectUrl = false;
  69
  70         /** @var int Revision ID of revision we are working on */
  71         protected $mRevIdFetched = 0;
  72
  73         /** @var Revision Revision we are working on */
  74         protected $mRevision = null;
  75
  76         /** @var ParserOutput */
  77         public $mParserOutput;
  78
  79         /**
  80          * Constructor and clear the article
  81          * @param Title $title Reference to a Title object.
  82          * @param int $oldId Revision ID, null to fetch from request, zero for current
  83          */
  84         public function __construct( Title $title, $oldId = null ) {
  85                 $this->mOldId = $oldId;
  86                 $this->mPage = $this->newPage( $title );
  87         }
  88
  89         /**
  90          * @param Title $title
  91          * @return WikiPage
  92          */
  93         protected function newPage( Title $title ) {
  94                 return new WikiPage( $title );
  95         }
  96
  97         /**
  98          * Constructor from a page id
  99          * @param int $id Article ID to load
 100          * @return Article|null
 101          */
 102         public static function newFromID( $id ) {
 103                 $t = Title::newFromID( $id );
 104                 # @todo FIXME: Doesn't inherit right
 105                 return $t == null ? null : new self( $t );
 106                 # return $t == null ? null : new static( $t ); // PHP 5.3
 107         }
 108
 109         /**
 110          * Create an Article object of the appropriate class for the given page.
 111          *
 112          * @param Title $title
 113          * @param IContextSource $context
 114          * @return Article
 115          */
 116         public static function newFromTitle( $title, IContextSource $context ) {
 117                 if ( NS_MEDIA == $title->getNamespace() ) {
 118                         // FIXME: where should this go?
 119                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 120                 }
 121
 122                 $page = null;
 123                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page, $context ) );
 124                 if ( !$page ) {
 125                         switch ( $title->getNamespace() ) {
 126                                 case NS_FILE:
 127                                         $page = new ImagePage( $title );
 128                                         break;
 129                                 case NS_CATEGORY:
 130                                         $page = new CategoryPage( $title );
 131                                         break;
 132                                 default:
 133                                         $page = new Article( $title );
 134                         }
 135                 }
 136                 $page->setContext( $context );
 137
 138                 return $page;
 139         }
 140
 141         /**
 142          * Create an Article object of the appropriate class for the given page.
 143          *
 144          * @param WikiPage $page
 145          * @param IContextSource $context
 146          * @return Article
 147          */
 148         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 149                 $article = self::newFromTitle( $page->getTitle(), $context );
 150                 $article->mPage = $page; // override to keep process cached vars
 151                 return $article;
 152         }
 153
 154         /**
 155          * Tell the page view functions that this view was redirected
 156          * from another page on the wiki.
 157          * @param Title $from
 158          */
 159         public function setRedirectedFrom( Title $from ) {
 160                 $this->mRedirectedFrom = $from;
 161         }
 162
 163         /**
 164          * Get the title object of the article
 165          *
 166          * @return Title Title object of this page
 167          */
 168         public function getTitle() {
 169                 return $this->mPage->getTitle();
 170         }
 171
 172         /**
 173          * Get the WikiPage object of this instance
 174          *
 175          * @since 1.19
 176          * @return WikiPage
 177          */
 178         public function getPage() {
 179                 return $this->mPage;
 180         }
 181
 182         /**
 183          * Clear the object
 184          */
 185         public function clear() {
 186                 $this->mContentLoaded = false;
 187
 188                 $this->mRedirectedFrom = null; # Title object if set
 189                 $this->mRevIdFetched = 0;
 190                 $this->mRedirectUrl = false;
 191
 192                 $this->mPage->clear();
 193         }
 194
 195         /**
 196          * Note that getContent/loadContent do not follow redirects anymore.
 197          * If you need to fetch redirectable content easily, try
 198          * the shortcut in WikiPage::getRedirectTarget()
 199          *
 200          * This function has side effects! Do not use this function if you
 201          * only want the real revision text if any.
 202          *
 203          * @deprecated since 1.21; use WikiPage::getContent() instead
 204          *
 205          * @return string Return the text of this revision
 206          */
 207         public function getContent() {
 208                 ContentHandler::deprecated( __METHOD__, '1.21' );
 209                 $content = $this->getContentObject();
 210                 return ContentHandler::getContentText( $content );
 211         }
 212
 213         /**
 214          * Returns a Content object representing the pages effective display content,
 215          * not necessarily the revision's content!
 216          *
 217          * Note that getContent/loadContent do not follow redirects anymore.
 218          * If you need to fetch redirectable content easily, try
 219          * the shortcut in WikiPage::getRedirectTarget()
 220          *
 221          * This function has side effects! Do not use this function if you
 222          * only want the real revision text if any.
 223          *
 224          * @return Content Return the content of this revision
 225          *
 226          * @since 1.21
 227          */
 228         protected function getContentObject() {
 229                 wfProfileIn( __METHOD__ );
 230
 231                 if ( $this->mPage->getID() === 0 ) {
 232                         # If this is a MediaWiki:x message, then load the messages
 233                         # and return the message value for x.
 234                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 235                                 $text = $this->getTitle()->getDefaultMessageText();
 236                                 if ( $text === false ) {
 237                                         $text = '';
 238                                 }
 239
 240                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 241                         } else {
 242                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 243                                 $content = new MessageContent( $message, null, 'parsemag' );
 244                         }
 245                 } else {
 246                         $this->fetchContentObject();
 247                         $content = $this->mContentObject;
 248                 }
 249
 250                 wfProfileOut( __METHOD__ );
 251                 return $content;
 252         }
 253
 254         /**
 255          * @return int The oldid of the article that is to be shown, 0 for the current revision
 256          */
 257         public function getOldID() {
 258                 if ( is_null( $this->mOldId ) ) {
 259                         $this->mOldId = $this->getOldIDFromRequest();
 260                 }
 261
 262                 return $this->mOldId;
 263         }
 264
 265         /**
 266          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 267          *
 268          * @return int The old id for the request
 269          */
 270         public function getOldIDFromRequest() {
 271                 $this->mRedirectUrl = false;
 272
 273                 $request = $this->getContext()->getRequest();
 274                 $oldid = $request->getIntOrNull( 'oldid' );
 275
 276                 if ( $oldid === null ) {
 277                         return 0;
 278                 }
 279
 280                 if ( $oldid !== 0 ) {
 281                         # Load the given revision and check whether the page is another one.
 282                         # In that case, update this instance to reflect the change.
 283                         if ( $oldid === $this->mPage->getLatest() ) {
 284                                 $this->mRevision = $this->mPage->getRevision();
 285                         } else {
 286                                 $this->mRevision = Revision::newFromId( $oldid );
 287                                 if ( $this->mRevision !== null ) {
 288                                         // Revision title doesn't match the page title given?
 289                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 290                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 291                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 292                                         }
 293                                 }
 294                         }
 295                 }
 296
 297                 if ( $request->getVal( 'direction' ) == 'next' ) {
 298                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 299                         if ( $nextid ) {
 300                                 $oldid = $nextid;
 301                                 $this->mRevision = null;
 302                         } else {
 303                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 304                         }
 305                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 306                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 307                         if ( $previd ) {
 308                                 $oldid = $previd;
 309                                 $this->mRevision = null;
 310                         }
 311                 }
 312
 313                 return $oldid;
 314         }
 315
 316         /**
 317          * Load the revision (including text) into this object
 318          *
 319          * @deprecated since 1.19; use fetchContent()
 320          */
 321         function loadContent() {
 322                 wfDeprecated( __METHOD__, '1.19' );
 323                 $this->fetchContent();
 324         }
 325
 326         /**
 327          * Get text of an article from database
 328          * Does *NOT* follow redirects.
 329          *
 330          * @protected
 331          * @note This is really internal functionality that should really NOT be
 332          * used by other functions. For accessing article content, use the WikiPage
 333          * class, especially WikiBase::getContent(). However, a lot of legacy code
 334          * uses this method to retrieve page text from the database, so the function
 335          * has to remain public for now.
 336          *
 337          * @return string|bool String containing article contents, or false if null
 338          * @deprecated since 1.21, use WikiPage::getContent() instead
 339          */
 340         function fetchContent() { #BC cruft!
 341                 ContentHandler::deprecated( __METHOD__, '1.21' );
 342
 343                 if ( $this->mContentLoaded && $this->mContent ) {
 344                         return $this->mContent;
 345                 }
 346
 347                 wfProfileIn( __METHOD__ );
 348
 349                 $content = $this->fetchContentObject();
 350
 351                 if ( !$content ) {
 352                         wfProfileOut( __METHOD__ );
 353                         return false;
 354                 }
 355
 356                 // @todo Get rid of mContent everywhere!
 357                 $this->mContent = ContentHandler::getContentText( $content );
 358                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 359
 360                 wfProfileOut( __METHOD__ );
 361
 362                 return $this->mContent;
 363         }
 364
 365         /**
 366          * Get text content object
 367          * Does *NOT* follow redirects.
 368          * @todo When is this null?
 369          *
 370          * @note Code that wants to retrieve page content from the database should
 371          * use WikiPage::getContent().
 372          *
 373          * @return Content|null|bool
 374          *
 375          * @since 1.21
 376          */
 377         protected function fetchContentObject() {
 378                 if ( $this->mContentLoaded ) {
 379                         return $this->mContentObject;
 380                 }
 381
 382                 wfProfileIn( __METHOD__ );
 383
 384                 $this->mContentLoaded = true;
 385                 $this->mContent = null;
 386
 387                 $oldid = $this->getOldID();
 388
 389                 # Pre-fill content with error message so that if something
 390                 # fails we'll have something telling us what we intended.
 391                 //XXX: this isn't page content but a UI message. horrible.
 392                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 393
 394                 if ( $oldid ) {
 395                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 396                         if ( !$this->mRevision ) {
 397                                 $this->mRevision = Revision::newFromId( $oldid );
 398                                 if ( !$this->mRevision ) {
 399                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 400                                         wfProfileOut( __METHOD__ );
 401                                         return false;
 402                                 }
 403                         }
 404                 } else {
 405                         if ( !$this->mPage->getLatest() ) {
 406                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 407                                         $this->getTitle()->getPrefixedText() . "\n" );
 408                                 wfProfileOut( __METHOD__ );
 409                                 return false;
 410                         }
 411
 412                         $this->mRevision = $this->mPage->getRevision();
 413
 414                         if ( !$this->mRevision ) {
 415                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " .
 416                                         $this->mPage->getLatest() . "\n" );
 417                                 wfProfileOut( __METHOD__ );
 418                                 return false;
 419                         }
 420                 }
 421
 422                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 423                 // We should instead work with the Revision object when we need it...
 424                 // Loads if user is allowed
 425                 $this->mContentObject = $this->mRevision->getContent(
 426                         Revision::FOR_THIS_USER,
 427                         $this->getContext()->getUser()
 428                 );
 429                 $this->mRevIdFetched = $this->mRevision->getId();
 430
 431                 wfRunHooks( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 432
 433                 wfProfileOut( __METHOD__ );
 434
 435                 return $this->mContentObject;
 436         }
 437
 438         /**
 439          * Returns true if the currently-referenced revision is the current edit
 440          * to this page (and it exists).
 441          * @return bool
 442          */
 443         public function isCurrent() {
 444                 # If no oldid, this is the current version.
 445                 if ( $this->getOldID() == 0 ) {
 446                         return true;
 447                 }
 448
 449                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 450         }
 451
 452         /**
 453          * Get the fetched Revision object depending on request parameters or null
 454          * on failure.
 455          *
 456          * @since 1.19
 457          * @return Revision|null
 458          */
 459         public function getRevisionFetched() {
 460                 $this->fetchContentObject();
 461
 462                 return $this->mRevision;
 463         }
 464
 465         /**
 466          * Use this to fetch the rev ID used on page views
 467          *
 468          * @return int Revision ID of last article revision
 469          */
 470         public function getRevIdFetched() {
 471                 if ( $this->mRevIdFetched ) {
 472                         return $this->mRevIdFetched;
 473                 } else {
 474                         return $this->mPage->getLatest();
 475                 }
 476         }
 477
 478         /**
 479          * This is the default action of the index.php entry point: just view the
 480          * page of the given title.
 481          */
 482         public function view() {
 483                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
 484
 485                 wfProfileIn( __METHOD__ );
 486
 487                 # Get variables from query string
 488                 # As side effect this will load the revision and update the title
 489                 # in a revision ID is passed in the request, so this should remain
 490                 # the first call of this method even if $oldid is used way below.
 491                 $oldid = $this->getOldID();
 492
 493                 $user = $this->getContext()->getUser();
 494                 # Another whitelist check in case getOldID() is altering the title
 495                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 496                 if ( count( $permErrors ) ) {
 497                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 498                         wfProfileOut( __METHOD__ );
 499                         throw new PermissionsError( 'read', $permErrors );
 500                 }
 501
 502                 $outputPage = $this->getContext()->getOutput();
 503                 # getOldID() may as well want us to redirect somewhere else
 504                 if ( $this->mRedirectUrl ) {
 505                         $outputPage->redirect( $this->mRedirectUrl );
 506                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 507                         wfProfileOut( __METHOD__ );
 508
 509                         return;
 510                 }
 511
 512                 # If we got diff in the query, we want to see a diff page instead of the article.
 513                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 514                         wfDebug( __METHOD__ . ": showing diff page\n" );
 515                         $this->showDiffPage();
 516                         wfProfileOut( __METHOD__ );
 517
 518                         return;
 519                 }
 520
 521                 # Set page title (may be overridden by DISPLAYTITLE)
 522                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 523
 524                 $outputPage->setArticleFlag( true );
 525                 # Allow frames by default
 526                 $outputPage->allowClickjacking();
 527
 528                 $parserCache = ParserCache::singleton();
 529
 530                 $parserOptions = $this->getParserOptions();
 531                 # Render printable version, use printable version cache
 532                 if ( $outputPage->isPrintable() ) {
 533                         $parserOptions->setIsPrintable( true );
 534                         $parserOptions->setEditSection( false );
 535                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 536                         $parserOptions->setEditSection( false );
 537                 }
 538
 539                 # Try client and file cache
 540                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 541                         if ( $wgUseETag ) {
 542                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 543                         }
 544
 545                         # Is it client cached?
 546                         if ( $outputPage->checkLastModified( $this->mPage->getTouched() ) ) {
 547                                 wfDebug( __METHOD__ . ": done 304\n" );
 548                                 wfProfileOut( __METHOD__ );
 549
 550                                 return;
 551                         # Try file cache
 552                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 553                                 wfDebug( __METHOD__ . ": done file cache\n" );
 554                                 # tell wgOut that output is taken care of
 555                                 $outputPage->disable();
 556                                 $this->mPage->doViewUpdates( $user, $oldid );
 557                                 wfProfileOut( __METHOD__ );
 558
 559                                 return;
 560                         }
 561                 }
 562
 563                 # Should the parser cache be used?
 564                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 565                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 566                 if ( $user->getStubThreshold() ) {
 567                         wfIncrStats( 'pcache_miss_stub' );
 568                 }
 569
 570                 $this->showRedirectedFromHeader();
 571                 $this->showNamespaceHeader();
 572
 573                 # Iterate through the possible ways of constructing the output text.
 574                 # Keep going until $outputDone is set, or we run out of things to do.
 575                 $pass = 0;
 576                 $outputDone = false;
 577                 $this->mParserOutput = false;
 578
 579                 while ( !$outputDone && ++$pass ) {
 580                         switch ( $pass ) {
 581                                 case 1:
 582                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 583                                         break;
 584                                 case 2:
 585                                         # Early abort if the page doesn't exist
 586                                         if ( !$this->mPage->exists() ) {
 587                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 588                                                 $this->showMissingArticle();
 589                                                 $this->mPage->doViewUpdates( $user );
 590                                                 wfProfileOut( __METHOD__ );
 591                                                 return;
 592                                         }
 593
 594                                         # Try the parser cache
 595                                         if ( $useParserCache ) {
 596                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 597
 598                                                 if ( $this->mParserOutput !== false ) {
 599                                                         if ( $oldid ) {
 600                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 601                                                                 $this->setOldSubtitle( $oldid );
 602                                                         } else {
 603                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 604                                                         }
 605                                                         $outputPage->addParserOutput( $this->mParserOutput );
 606                                                         # Ensure that UI elements requiring revision ID have
 607                                                         # the correct version information.
 608                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 609                                                         # Preload timestamp to avoid a DB hit
 610                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 611                                                         if ( $cachedTimestamp !== null ) {
 612                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 613                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 614                                                         }
 615                                                         $outputDone = true;
 616                                                 }
 617                                         }
 618                                         break;
 619                                 case 3:
 620                                         # This will set $this->mRevision if needed
 621                                         $this->fetchContentObject();
 622
 623                                         # Are we looking at an old revision
 624                                         if ( $oldid && $this->mRevision ) {
 625                                                 $this->setOldSubtitle( $oldid );
 626
 627                                                 if ( !$this->showDeletedRevisionHeader() ) {
 628                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 629                                                         wfProfileOut( __METHOD__ );
 630                                                         return;
 631                                                 }
 632                                         }
 633
 634                                         # Ensure that UI elements requiring revision ID have
 635                                         # the correct version information.
 636                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 637                                         # Preload timestamp to avoid a DB hit
 638                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 639
 640                                         # Pages containing custom CSS or JavaScript get special treatment
 641                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 642                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 643                                                 $this->showCssOrJsPage();
 644                                                 $outputDone = true;
 645                                         } elseif ( !wfRunHooks( 'ArticleContentViewCustom',
 646                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 647
 648                                                 # Allow extensions do their own custom view for certain pages
 649                                                 $outputDone = true;
 650                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 651                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 652
 653                                                 # Allow extensions do their own custom view for certain pages
 654                                                 $outputDone = true;
 655                                         }
 656                                         break;
 657                                 case 4:
 658                                         # Run the parse, protected by a pool counter
 659                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 660
 661                                         $content = $this->getContentObject();
 662                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 663                                                 $this->getRevIdFetched(), $useParserCache, $content );
 664
 665                                         if ( !$poolArticleView->execute() ) {
 666                                                 $error = $poolArticleView->getError();
 667                                                 if ( $error ) {
 668                                                         $outputPage->clearHTML(); // for release() errors
 669                                                         $outputPage->enableClientCache( false );
 670                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 671
 672                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 673                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 674                                                 }
 675                                                 # Connection or timeout error
 676                                                 wfProfileOut( __METHOD__ );
 677                                                 return;
 678                                         }
 679
 680                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 681                                         $outputPage->addParserOutput( $this->mParserOutput );
 682                                         if ( $content->getRedirectTarget() ) {
 683                                                 $outputPage->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
 684                                         }
 685
 686                                         # Don't cache a dirty ParserOutput object
 687                                         if ( $poolArticleView->getIsDirty() ) {
 688                                                 $outputPage->setSquidMaxage( 0 );
 689                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 690                                                         "sending anyway due to pool overload-->\n" );
 691                                         }
 692
 693                                         $outputDone = true;
 694                                         break;
 695                                 # Should be unreachable, but just in case...
 696                                 default:
 697                                         break 2;
 698                         }
 699                 }
 700
 701                 # Get the ParserOutput actually *displayed* here.
 702                 # Note that $this->mParserOutput is the *current* version output.
 703                 $pOutput = ( $outputDone instanceof ParserOutput )
 704                         ? $outputDone // object fetched by hook
 705                         : $this->mParserOutput;
 706
 707                 # Adjust title for main page & pages with displaytitle
 708                 if ( $pOutput ) {
 709                         $this->adjustDisplayTitle( $pOutput );
 710                 }
 711
 712                 # For the main page, overwrite the <title> element with the con-
 713                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 714                 # that's not empty).
 715                 # This message always exists because it is in the i18n files
 716                 if ( $this->getTitle()->isMainPage() ) {
 717                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 718                         if ( !$msg->isDisabled() ) {
 719                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 720                         }
 721                 }
 722
 723                 # Check for any __NOINDEX__ tags on the page using $pOutput
 724                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 725                 $outputPage->setIndexPolicy( $policy['index'] );
 726                 $outputPage->setFollowPolicy( $policy['follow'] );
 727
 728                 $this->showViewFooter();
 729                 $this->mPage->doViewUpdates( $user, $oldid );
 730
 731                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 732
 733                 wfProfileOut( __METHOD__ );
 734         }
 735
 736         /**
 737          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 738          * @param ParserOutput $pOutput
 739          */
 740         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 741                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 742                 $titleText = $pOutput->getTitleText();
 743                 if ( strval( $titleText ) !== '' ) {
 744                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 745                 }
 746         }
 747
 748         /**
 749          * Show a diff page according to current request variables. For use within
 750          * Article::view() only, other callers should use the DifferenceEngine class.
 751          *
 752          * @todo Make protected
 753          */
 754         public function showDiffPage() {
 755                 $request = $this->getContext()->getRequest();
 756                 $user = $this->getContext()->getUser();
 757                 $diff = $request->getVal( 'diff' );
 758                 $rcid = $request->getVal( 'rcid' );
 759                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 760                 $purge = $request->getVal( 'action' ) == 'purge';
 761                 $unhide = $request->getInt( 'unhide' ) == 1;
 762                 $oldid = $this->getOldID();
 763
 764                 $rev = $this->getRevisionFetched();
 765
 766                 if ( !$rev ) {
 767                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 768                         $this->getContext()->getOutput()->addWikiMsg( 'difference-missing-revision', $oldid, 1 );
 769                         return;
 770                 }
 771
 772                 $contentHandler = $rev->getContentHandler();
 773                 $de = $contentHandler->createDifferenceEngine(
 774                         $this->getContext(),
 775                         $oldid,
 776                         $diff,
 777                         $rcid,
 778                         $purge,
 779                         $unhide
 780                 );
 781
 782                 // DifferenceEngine directly fetched the revision:
 783                 $this->mRevIdFetched = $de->mNewid;
 784                 $de->showDiffPage( $diffOnly );
 785
 786                 // Run view updates for the newer revision being diffed (and shown
 787                 // below the diff if not $diffOnly).
 788                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 789                 // New can be false, convert it to 0 - this conveniently means the latest revision
 790                 $this->mPage->doViewUpdates( $user, (int)$new );
 791         }
 792
 793         /**
 794          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 795          * Article::view() only.
 796          *
 797          * This exists mostly to serve the deprecated ShowRawCssJs hook (used to customize these views).
 798          * It has been replaced by the ContentGetParserOutput hook, which lets you do the same but with
 799          * more flexibility.
 800          *
 801          * @param bool $showCacheHint Whether to show a message telling the user
 802          *   to clear the browser cache (default: true).
 803          */
 804         protected function showCssOrJsPage( $showCacheHint = true ) {
 805                 $outputPage = $this->getContext()->getOutput();
 806
 807                 if ( $showCacheHint ) {
 808                         $dir = $this->getContext()->getLanguage()->getDir();
 809                         $lang = $this->getContext()->getLanguage()->getCode();
 810
 811                         $outputPage->wrapWikiMsg(
 812                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 813                                 'clearyourcache'
 814                         );
 815                 }
 816
 817                 $this->fetchContentObject();
 818
 819                 if ( $this->mContentObject ) {
 820                         // Give hooks a chance to customise the output
 821                         if ( ContentHandler::runLegacyHooks(
 822                                 'ShowRawCssJs',
 823                                 array( $this->mContentObject, $this->getTitle(), $outputPage ) )
 824                         ) {
 825                                 // If no legacy hooks ran, display the content of the parser output, including RL modules,
 826                                 // but excluding metadata like categories and language links
 827                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 828                                 $outputPage->addParserOutputContent( $po );
 829                         }
 830                 }
 831         }
 832
 833         /**
 834          * Get the robot policy to be used for the current view
 835          * @param string $action The action= GET parameter
 836          * @param ParserOutput|null $pOutput
 837          * @return array The policy that should be set
 838          * @todo: actions other than 'view'
 839          */
 840         public function getRobotPolicy( $action, $pOutput = null ) {
 841                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 842
 843                 $ns = $this->getTitle()->getNamespace();
 844
 845                 # Don't index user and user talk pages for blocked users (bug 11443)
 846                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 847                         $specificTarget = null;
 848                         $vagueTarget = null;
 849                         $titleText = $this->getTitle()->getText();
 850                         if ( IP::isValid( $titleText ) ) {
 851                                 $vagueTarget = $titleText;
 852                         } else {
 853                                 $specificTarget = $titleText;
 854                         }
 855                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 856                                 return array(
 857                                         'index' => 'noindex',
 858                                         'follow' => 'nofollow'
 859                                 );
 860                         }
 861                 }
 862
 863                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 864                         # Non-articles (special pages etc), and old revisions
 865                         return array(
 866                                 'index' => 'noindex',
 867                                 'follow' => 'nofollow'
 868                         );
 869                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 870                         # Discourage indexing of printable versions, but encourage following
 871                         return array(
 872                                 'index' => 'noindex',
 873                                 'follow' => 'follow'
 874                         );
 875                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 876                         # For ?curid=x urls, disallow indexing
 877                         return array(
 878                                 'index' => 'noindex',
 879                                 'follow' => 'follow'
 880                         );
 881                 }
 882
 883                 # Otherwise, construct the policy based on the various config variables.
 884                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 885
 886                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 887                         # Honour customised robot policies for this namespace
 888                         $policy = array_merge(
 889                                 $policy,
 890                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 891                         );
 892                 }
 893                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 894                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 895                         # a final sanity check that we have really got the parser output.
 896                         $policy = array_merge(
 897                                 $policy,
 898                                 array( 'index' => $pOutput->getIndexPolicy() )
 899                         );
 900                 }
 901
 902                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 903                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 904                         $policy = array_merge(
 905                                 $policy,
 906                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 907                         );
 908                 }
 909
 910                 return $policy;
 911         }
 912
 913         /**
 914          * Converts a String robot policy into an associative array, to allow
 915          * merging of several policies using array_merge().
 916          * @param array|string $policy Returns empty array on null/false/'', transparent
 917          *   to already-converted arrays, converts string.
 918          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 919          */
 920         public static function formatRobotPolicy( $policy ) {
 921                 if ( is_array( $policy ) ) {
 922                         return $policy;
 923                 } elseif ( !$policy ) {
 924                         return array();
 925                 }
 926
 927                 $policy = explode( ',', $policy );
 928                 $policy = array_map( 'trim', $policy );
 929
 930                 $arr = array();
 931                 foreach ( $policy as $var ) {
 932                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 933                                 $arr['index'] = $var;
 934                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 935                                 $arr['follow'] = $var;
 936                         }
 937                 }
 938
 939                 return $arr;
 940         }
 941
 942         /**
 943          * If this request is a redirect view, send "redirected from" subtitle to
 944          * the output. Returns true if the header was needed, false if this is not
 945          * a redirect view. Handles both local and remote redirects.
 946          *
 947          * @return bool
 948          */
 949         public function showRedirectedFromHeader() {
 950                 global $wgRedirectSources;
 951                 $outputPage = $this->getContext()->getOutput();
 952
 953                 $rdfrom = $this->getContext()->getRequest()->getVal( 'rdfrom' );
 954
 955                 if ( isset( $this->mRedirectedFrom ) ) {
 956                         // This is an internally redirected page view.
 957                         // We'll need a backlink to the source page for navigation.
 958                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 959                                 $redir = Linker::linkKnown(
 960                                         $this->mRedirectedFrom,
 961                                         null,
 962                                         array(),
 963                                         array( 'redirect' => 'no' )
 964                                 );
 965
 966                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 967
 968                                 // Set the fragment if one was specified in the redirect
 969                                 if ( $this->getTitle()->hasFragment() ) {
 970                                         $outputPage->addJsConfigVars( 'wgRedirectToFragment', $this->getTitle()->getFragmentForURL() );
 971                                         $outputPage->addModules( 'mediawiki.action.view.redirectToFragment' );
 972                                 }
 973
 974                                 // Add a <link rel="canonical"> tag
 975                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
 976
 977                                 // Tell the output object that the user arrived at this article through a redirect
 978                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 979
 980                                 return true;
 981                         }
 982                 } elseif ( $rdfrom ) {
 983                         // This is an externally redirected view, from some other wiki.
 984                         // If it was reported from a trusted site, supply a backlink.
 985                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 986                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 987                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 988
 989                                 return true;
 990                         }
 991                 }
 992
 993                 return false;
 994         }
 995
 996         /**
 997          * Show a header specific to the namespace currently being viewed, like
 998          * [[MediaWiki:Talkpagetext]]. For Article::view().
 999          */
1000         public function showNamespaceHeader() {
1001                 if ( $this->getTitle()->isTalkPage() ) {
1002                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1003                                 $this->getContext()->getOutput()->wrapWikiMsg(
1004                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1005                                         array( 'talkpageheader' )
1006                                 );
1007                         }
1008                 }
1009         }
1010
1011         /**
1012          * Show the footer section of an ordinary page view
1013          */
1014         public function showViewFooter() {
1015                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1016                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1017                         && IP::isValid( $this->getTitle()->getText() )
1018                 ) {
1019                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1020                 }
1021
1022                 // Show a footer allowing the user to patrol the shown revision or page if possible
1023                 $patrolFooterShown = $this->showPatrolFooter();
1024
1025                 wfRunHooks( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1026         }
1027
1028         /**
1029          * If patrol is possible, output a patrol UI box. This is called from the
1030          * footer section of ordinary page views. If patrol is not possible or not
1031          * desired, does nothing.
1032          * Side effect: When the patrol link is build, this method will call
1033          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1034          *
1035          * @return bool
1036          */
1037         public function showPatrolFooter() {
1038                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1039
1040                 $outputPage = $this->getContext()->getOutput();
1041                 $user = $this->getContext()->getUser();
1042                 $cache = wfGetMainCache();
1043                 $rc = false;
1044
1045                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user )
1046                         || !( $wgUseRCPatrol || $wgUseNPPatrol )
1047                 ) {
1048                         // Patrolling is disabled or the user isn't allowed to
1049                         return false;
1050                 }
1051
1052                 wfProfileIn( __METHOD__ );
1053
1054                 // New page patrol: Get the timestamp of the oldest revison which
1055                 // the revision table holds for the given page. Then we look
1056                 // whether it's within the RC lifespan and if it is, we try
1057                 // to get the recentchanges row belonging to that entry
1058                 // (with rc_new = 1).
1059
1060                 // Check for cached results
1061                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1062                         wfProfileOut( __METHOD__ );
1063                         return false;
1064                 }
1065
1066                 if ( $this->mRevision
1067                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1068                 ) {
1069                         // The current revision is already older than what could be in the RC table
1070                         // 6h tolerance because the RC might not be cleaned out regularly
1071                         wfProfileOut( __METHOD__ );
1072                         return false;
1073                 }
1074
1075                 $dbr = wfGetDB( DB_SLAVE );
1076                 $oldestRevisionTimestamp = $dbr->selectField(
1077                         'revision',
1078                         'MIN( rev_timestamp )',
1079                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1080                         __METHOD__
1081                 );
1082
1083                 if ( $oldestRevisionTimestamp
1084                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1085                 ) {
1086                         // 6h tolerance because the RC might not be cleaned out regularly
1087                         $rc = RecentChange::newFromConds(
1088                                 array(
1089                                         'rc_new' => 1,
1090                                         'rc_timestamp' => $oldestRevisionTimestamp,
1091                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1092                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1093                                         'rc_patrolled' => 0
1094                                 ),
1095                                 __METHOD__,
1096                                 array( 'USE INDEX' => 'new_name_timestamp' )
1097                         );
1098                 }
1099
1100                 if ( !$rc ) {
1101                         // No RC entry around
1102
1103                         // Cache the information we gathered above in case we can't patrol
1104                         // Don't cache in case we can patrol as this could change
1105                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1106
1107                         wfProfileOut( __METHOD__ );
1108                         return false;
1109                 }
1110
1111                 if ( $rc->getPerformer()->getName() == $user->getName() ) {
1112                         // Don't show a patrol link for own creations. If the user could
1113                         // patrol them, they already would be patrolled
1114                         wfProfileOut( __METHOD__ );
1115                         return false;
1116                 }
1117
1118                 $rcid = $rc->getAttribute( 'rc_id' );
1119
1120                 $token = $user->getEditToken( $rcid );
1121
1122                 $outputPage->preventClickjacking();
1123                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1124                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1125                 }
1126
1127                 $link = Linker::linkKnown(
1128                         $this->getTitle(),
1129                         wfMessage( 'markaspatrolledtext' )->escaped(),
1130                         array(),
1131                         array(
1132                                 'action' => 'markpatrolled',
1133                                 'rcid' => $rcid,
1134                                 'token' => $token,
1135                         )
1136                 );
1137
1138                 $outputPage->addHTML(
1139                         "<div class='patrollink'>" .
1140                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1141                         '</div>'
1142                 );
1143
1144                 wfProfileOut( __METHOD__ );
1145                 return true;
1146         }
1147
1148         /**
1149          * Show the error text for a missing article. For articles in the MediaWiki
1150          * namespace, show the default message text. To be called from Article::view().
1151          */
1152         public function showMissingArticle() {
1153                 global $wgSend404Code;
1154                 $outputPage = $this->getContext()->getOutput();
1155                 // Whether the page is a root user page of an existing user (but not a subpage)
1156                 $validUserPage = false;
1157
1158                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1159                 if ( $this->getTitle()->getNamespace() == NS_USER
1160                         || $this->getTitle()->getNamespace() == NS_USER_TALK
1161                 ) {
1162                         $parts = explode( '/', $this->getTitle()->getText() );
1163                         $rootPart = $parts[0];
1164                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1165                         $ip = User::isIP( $rootPart );
1166                         $block = Block::newFromTarget( $user, $user );
1167
1168                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1169                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1170                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1171                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) { # Show log extract if the user is currently blocked
1172                                 LogEventsList::showLogExtract(
1173                                         $outputPage,
1174                                         'block',
1175                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1176                                         '',
1177                                         array(
1178                                                 'lim' => 1,
1179                                                 'showIfEmpty' => false,
1180                                                 'msgKey' => array(
1181                                                         'blocked-notice-logextract',
1182                                                         $user->getName() # Support GENDER in notice
1183                                                 )
1184                                         )
1185                                 );
1186                                 $validUserPage = !$this->getTitle()->isSubpage();
1187                         } else {
1188                                 $validUserPage = !$this->getTitle()->isSubpage();
1189                         }
1190                 }
1191
1192                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1193
1194                 // Give extensions a chance to hide their (unrelated) log entries
1195                 $logTypes = array( 'delete', 'move' );
1196                 $conds = array( "log_action != 'revision'" );
1197                 wfRunHooks( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1198
1199                 # Show delete and move logs
1200                 LogEventsList::showLogExtract( $outputPage, $logTypes, $this->getTitle(), '',
1201                         array( 'lim' => 10,
1202                                 'conds' => $conds,
1203                                 'showIfEmpty' => false,
1204                                 'msgKey' => array( 'moveddeleted-notice' ) )
1205                 );
1206
1207                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1208                         // If there's no backing content, send a 404 Not Found
1209                         // for better machine handling of broken links.
1210                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1211                 }
1212
1213                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1214                 $policy = $this->getRobotPolicy( 'view' );
1215                 $outputPage->setIndexPolicy( $policy['index'] );
1216                 $outputPage->setFollowPolicy( $policy['follow'] );
1217
1218                 $hookResult = wfRunHooks( 'BeforeDisplayNoArticleText', array( $this ) );
1219
1220                 if ( ! $hookResult ) {
1221                         return;
1222                 }
1223
1224                 # Show error message
1225                 $oldid = $this->getOldID();
1226                 if ( $oldid ) {
1227                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1228                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
1229                         // Use the default message text
1230                         $text = $this->getTitle()->getDefaultMessageText();
1231                 } elseif ( $this->getTitle()->quickUserCan( 'create', $this->getContext()->getUser() )
1232                         && $this->getTitle()->quickUserCan( 'edit', $this->getContext()->getUser() )
1233                 ) {
1234                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1235                         $text = wfMessage( $message )->plain();
1236                 } else {
1237                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1238                 }
1239                 $text = "<div class='noarticletext'>\n$text\n</div>";
1240
1241                 $outputPage->addWikiText( $text );
1242         }
1243
1244         /**
1245          * If the revision requested for view is deleted, check permissions.
1246          * Send either an error message or a warning header to the output.
1247          *
1248          * @return bool true if the view is allowed, false if not.
1249          */
1250         public function showDeletedRevisionHeader() {
1251                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1252                         // Not deleted
1253                         return true;
1254                 }
1255
1256                 $outputPage = $this->getContext()->getOutput();
1257                 $user = $this->getContext()->getUser();
1258                 // If the user is not allowed to see it...
1259                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1260                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1261                                 'rev-deleted-text-permission' );
1262
1263                         return false;
1264                 // If the user needs to confirm that they want to see it...
1265                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1266                         # Give explanation and add a link to view the revision...
1267                         $oldid = intval( $this->getOldID() );
1268                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1269                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1270                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1271                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1272                                 array( $msg, $link ) );
1273
1274                         return false;
1275                 // We are allowed to see...
1276                 } else {
1277                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1278                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1279                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1280
1281                         return true;
1282                 }
1283         }
1284
1285         /**
1286          * Generate the navigation links when browsing through an article revisions
1287          * It shows the information as:
1288          *   Revision as of \<date\>; view current revision
1289          *   \<- Previous version | Next Version -\>
1290          *
1291          * @param int $oldid Revision ID of this article revision
1292          */
1293         public function setOldSubtitle( $oldid = 0 ) {
1294                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1295                         return;
1296                 }
1297
1298                 $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
1299
1300                 # Cascade unhide param in links for easy deletion browsing
1301                 $extraParams = array();
1302                 if ( $unhide ) {
1303                         $extraParams['unhide'] = 1;
1304                 }
1305
1306                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1307                         $revision = $this->mRevision;
1308                 } else {
1309                         $revision = Revision::newFromId( $oldid );
1310                 }
1311
1312                 $timestamp = $revision->getTimestamp();
1313
1314                 $current = ( $oldid == $this->mPage->getLatest() );
1315                 $language = $this->getContext()->getLanguage();
1316                 $user = $this->getContext()->getUser();
1317
1318                 $td = $language->userTimeAndDate( $timestamp, $user );
1319                 $tddate = $language->userDate( $timestamp, $user );
1320                 $tdtime = $language->userTime( $timestamp, $user );
1321
1322                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1323                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1324
1325                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1326                         ? 'revision-info-current'
1327                         : 'revision-info';
1328
1329                 $outputPage = $this->getContext()->getOutput();
1330                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1331                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1332                         $tdtime, $revision->getUserText() )->rawParams( Linker::revComment( $revision, true, true ) )->parse() . "</div>" );
1333
1334                 $lnk = $current
1335                         ? wfMessage( 'currentrevisionlink' )->escaped()
1336                         : Linker::linkKnown(
1337                                 $this->getTitle(),
1338                                 wfMessage( 'currentrevisionlink' )->escaped(),
1339                                 array(),
1340                                 $extraParams
1341                         );
1342                 $curdiff = $current
1343                         ? wfMessage( 'diff' )->escaped()
1344                         : Linker::linkKnown(
1345                                 $this->getTitle(),
1346                                 wfMessage( 'diff' )->escaped(),
1347                                 array(),
1348                                 array(
1349                                         'diff' => 'cur',
1350                                         'oldid' => $oldid
1351                                 ) + $extraParams
1352                         );
1353                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1354                 $prevlink = $prev
1355                         ? Linker::linkKnown(
1356                                 $this->getTitle(),
1357                                 wfMessage( 'previousrevision' )->escaped(),
1358                                 array(),
1359                                 array(
1360                                         'direction' => 'prev',
1361                                         'oldid' => $oldid
1362                                 ) + $extraParams
1363                         )
1364                         : wfMessage( 'previousrevision' )->escaped();
1365                 $prevdiff = $prev
1366                         ? Linker::linkKnown(
1367                                 $this->getTitle(),
1368                                 wfMessage( 'diff' )->escaped(),
1369                                 array(),
1370                                 array(
1371                                         'diff' => 'prev',
1372                                         'oldid' => $oldid
1373                                 ) + $extraParams
1374                         )
1375                         : wfMessage( 'diff' )->escaped();
1376                 $nextlink = $current
1377                         ? wfMessage( 'nextrevision' )->escaped()
1378                         : Linker::linkKnown(
1379                                 $this->getTitle(),
1380                                 wfMessage( 'nextrevision' )->escaped(),
1381                                 array(),
1382                                 array(
1383                                         'direction' => 'next',
1384                                         'oldid' => $oldid
1385                                 ) + $extraParams
1386                         );
1387                 $nextdiff = $current
1388                         ? wfMessage( 'diff' )->escaped()
1389                         : Linker::linkKnown(
1390                                 $this->getTitle(),
1391                                 wfMessage( 'diff' )->escaped(),
1392                                 array(),
1393                                 array(
1394                                         'diff' => 'next',
1395                                         'oldid' => $oldid
1396                                 ) + $extraParams
1397                         );
1398
1399                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1400                 if ( $cdel !== '' ) {
1401                         $cdel .= ' ';
1402                 }
1403
1404                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1405                         wfMessage( 'revision-nav' )->rawParams(
1406                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1407                         )->escaped() . "</div>" );
1408         }
1409
1410         /**
1411          * Return the HTML for the top of a redirect page
1412          *
1413          * Chances are you should just be using the ParserOutput from
1414          * WikitextContent::getParserOutput instead of calling this for redirects.
1415          *
1416          * @param Title|array $target Destination(s) to redirect
1417          * @param bool $appendSubtitle [optional]
1418          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1419          * @return string Containing HMTL with redirect link
1420          */
1421         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1422                 $lang = $this->getTitle()->getPageLanguage();
1423                 if ( $appendSubtitle ) {
1424                         $out = $this->getContext()->getOutput();
1425                         $out->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
1426                 }
1427                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1428         }
1429
1430         /**
1431          * Return the HTML for the top of a redirect page
1432          *
1433          * Chances are you should just be using the ParserOutput from
1434          * WikitextContent::getParserOutput instead of calling this for redirects.
1435          *
1436          * @since 1.23
1437          * @param Language $lang
1438          * @param Title|array $target Destination(s) to redirect
1439          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1440          * @return string Containing HMTL with redirect link
1441          */
1442         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1443                 global $wgStylePath;
1444
1445                 if ( !is_array( $target ) ) {
1446                         $target = array( $target );
1447                 }
1448
1449                 $imageDir = $lang->getDir();
1450
1451                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1452
1453                 /** @var $title Title */
1454                 $title = array_shift( $target );
1455
1456                 if ( $forceKnown ) {
1457                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1458                 } else {
1459                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1460                 }
1461
1462                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1463                 $alt = $lang->isRTL() ? '←' : '→';
1464
1465                 // Automatically append redirect=no to each link, since most of them are
1466                 // redirect pages themselves.
1467                 /** @var Title $rt */
1468                 foreach ( $target as $rt ) {
1469                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1470                         if ( $forceKnown ) {
1471                                 $link .= Linker::linkKnown(
1472                                         $rt,
1473                                         htmlspecialchars( $rt->getFullText(),
1474                                         array(),
1475                                         array( 'redirect' => 'no' )
1476                                 )
1477                                 );
1478                         } else {
1479                                 $link .= Linker::link(
1480                                         $rt,
1481                                         htmlspecialchars( $rt->getFullText() ),
1482                                         array(),
1483                                         array( 'redirect' => 'no' )
1484                                 );
1485                         }
1486                 }
1487
1488                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1489                 return '<div class="redirectMsg">' .
1490                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1491                         '<span class="redirectText">' . $link . '</span></div>';
1492         }
1493
1494         /**
1495          * Handle action=render
1496          */
1497         public function render() {
1498                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1499                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1500                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1501                 $this->view();
1502         }
1503
1504         /**
1505          * action=protect handler
1506          */
1507         public function protect() {
1508                 $form = new ProtectionForm( $this );
1509                 $form->execute();
1510         }
1511
1512         /**
1513          * action=unprotect handler (alias)
1514          */
1515         public function unprotect() {
1516                 $this->protect();
1517         }
1518
1519         /**
1520          * UI entry point for page deletion
1521          */
1522         public function delete() {
1523                 # This code desperately needs to be totally rewritten
1524
1525                 $title = $this->getTitle();
1526                 $user = $this->getContext()->getUser();
1527
1528                 # Check permissions
1529                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1530                 if ( count( $permission_errors ) ) {
1531                         throw new PermissionsError( 'delete', $permission_errors );
1532                 }
1533
1534                 # Read-only check...
1535                 if ( wfReadOnly() ) {
1536                         throw new ReadOnlyError;
1537                 }
1538
1539                 # Better double-check that it hasn't been deleted yet!
1540                 $this->mPage->loadPageData( 'fromdbmaster' );
1541                 if ( !$this->mPage->exists() ) {
1542                         $deleteLogPage = new LogPage( 'delete' );
1543                         $outputPage = $this->getContext()->getOutput();
1544                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1545                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1546                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1547                                 );
1548                         $outputPage->addHTML(
1549                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1550                         );
1551                         LogEventsList::showLogExtract(
1552                                 $outputPage,
1553                                 'delete',
1554                                 $title
1555                         );
1556
1557                         return;
1558                 }
1559
1560                 $request = $this->getContext()->getRequest();
1561                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1562                 $deleteReason = $request->getText( 'wpReason' );
1563
1564                 if ( $deleteReasonList == 'other' ) {
1565                         $reason = $deleteReason;
1566                 } elseif ( $deleteReason != '' ) {
1567                         // Entry from drop down menu + additional comment
1568                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1569                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1570                 } else {
1571                         $reason = $deleteReasonList;
1572                 }
1573
1574                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1575                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1576                 ) {
1577                         # Flag to hide all contents of the archived revisions
1578                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1579
1580                         $this->doDelete( $reason, $suppress );
1581
1582                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1583
1584                         return;
1585                 }
1586
1587                 // Generate deletion reason
1588                 $hasHistory = false;
1589                 if ( !$reason ) {
1590                         try {
1591                                 $reason = $this->generateReason( $hasHistory );
1592                         } catch ( MWException $e ) {
1593                                 # if a page is horribly broken, we still want to be able to
1594                                 # delete it. So be lenient about errors here.
1595                                 wfDebug( "Error while building auto delete summary: $e" );
1596                                 $reason = '';
1597                         }
1598                 }
1599
1600                 // If the page has a history, insert a warning
1601                 if ( $hasHistory ) {
1602                         $revisions = $this->mTitle->estimateRevisionCount();
1603                         // @todo FIXME: i18n issue/patchwork message
1604                         $this->getContext()->getOutput()->addHTML( '<strong class="mw-delete-warning-revisions">' .
1605                                 wfMessage( 'historywarning' )->numParams( $revisions )->parse() .
1606                                 wfMessage( 'word-separator' )->plain() . Linker::linkKnown( $title,
1607                                         wfMessage( 'history' )->escaped(),
1608                                         array( 'rel' => 'archives' ),
1609                                         array( 'action' => 'history' ) ) .
1610                                 '</strong>'
1611                         );
1612
1613                         if ( $this->mTitle->isBigDeletion() ) {
1614                                 global $wgDeleteRevisionsLimit;
1615                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1616                                         array(
1617                                                 'delete-warning-toobig',
1618                                                 $this->getContext()->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1619                                         )
1620                                 );
1621                         }
1622                 }
1623
1624                 $this->confirmDelete( $reason );
1625         }
1626
1627         /**
1628          * Output deletion confirmation dialog
1629          * @todo FIXME: Move to another file?
1630          * @param string $reason Prefilled reason
1631          */
1632         public function confirmDelete( $reason ) {
1633                 wfDebug( "Article::confirmDelete\n" );
1634
1635                 $outputPage = $this->getContext()->getOutput();
1636                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1637                 $outputPage->addBacklinkSubtitle( $this->getTitle() );
1638                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1639                 $backlinkCache = $this->getTitle()->getBacklinkCache();
1640                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1641                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1642                                 'deleting-backlinks-warning' );
1643                 }
1644                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1645
1646                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1647
1648                 $user = $this->getContext()->getUser();
1649
1650                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1651                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1652                                         <td></td>
1653                                         <td class='mw-input'><strong>" .
1654                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1655                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1656                                         "</strong></td>
1657                                 </tr>";
1658                 } else {
1659                         $suppress = '';
1660                 }
1661                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $this->getTitle() );
1662
1663                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1664                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1665                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1666                         Xml::tags( 'legend', null, wfMessage( 'delete-legend' )->escaped() ) .
1667                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1668                         "<tr id=\"wpDeleteReasonListRow\">
1669                                 <td class='mw-label'>" .
1670                                         Xml::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1671                                 "</td>
1672                                 <td class='mw-input'>" .
1673                                         Xml::listDropDown(
1674                                                 'wpDeleteReasonList',
1675                                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1676                                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1677                                                 '',
1678                                                 'wpReasonDropDown',
1679                                                 1
1680                                         ) .
1681                                 "</td>
1682                         </tr>
1683                         <tr id=\"wpDeleteReasonRow\">
1684                                 <td class='mw-label'>" .
1685                                         Xml::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1686                                 "</td>
1687                                 <td class='mw-input'>" .
1688                                 Html::input( 'wpReason', $reason, 'text', array(
1689                                         'size' => '60',
1690                                         'maxlength' => '255',
1691                                         'tabindex' => '2',
1692                                         'id' => 'wpReason',
1693                                         'autofocus'
1694                                 ) ) .
1695                                 "</td>
1696                         </tr>";
1697
1698                 # Disallow watching if user is not logged in
1699                 if ( $user->isLoggedIn() ) {
1700                         $form .= "
1701                         <tr>
1702                                 <td></td>
1703                                 <td class='mw-input'>" .
1704                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1705                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1706                                 "</td>
1707                         </tr>";
1708                 }
1709
1710                 $form .= "
1711                         $suppress
1712                         <tr>
1713                                 <td></td>
1714                                 <td class='mw-submit'>" .
1715                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1716                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1717                                 "</td>
1718                         </tr>" .
1719                         Xml::closeElement( 'table' ) .
1720                         Xml::closeElement( 'fieldset' ) .
1721                         Html::hidden(
1722                                 'wpEditToken',
1723                                 $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) )
1724                         ) .
1725                         Xml::closeElement( 'form' );
1726
1727                         if ( $user->isAllowed( 'editinterface' ) ) {
1728                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1729                                 $link = Linker::link(
1730                                         $title,
1731                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1732                                         array(),
1733                                         array( 'action' => 'edit' )
1734                                 );
1735                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1736                         }
1737
1738                 $outputPage->addHTML( $form );
1739
1740                 $deleteLogPage = new LogPage( 'delete' );
1741                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1742                 LogEventsList::showLogExtract( $outputPage, 'delete',
1743                         $this->getTitle()
1744                 );
1745         }
1746
1747         /**
1748          * Perform a deletion and output success or failure messages
1749          * @param string $reason
1750          * @param bool $suppress
1751          */
1752         public function doDelete( $reason, $suppress = false ) {
1753                 $error = '';
1754                 $outputPage = $this->getContext()->getOutput();
1755                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1756
1757                 if ( $status->isGood() ) {
1758                         $deleted = $this->getTitle()->getPrefixedText();
1759
1760                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1761                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1762
1763                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1764
1765                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1766                         $outputPage->returnToMain( false );
1767                 } else {
1768                         $outputPage->setPageTitle(
1769                                 wfMessage( 'cannotdelete-title',
1770                                         $this->getTitle()->getPrefixedText() )
1771                         );
1772
1773                         if ( $error == '' ) {
1774                                 $outputPage->addWikiText(
1775                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1776                                 );
1777                                 $deleteLogPage = new LogPage( 'delete' );
1778                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1779
1780                                 LogEventsList::showLogExtract(
1781                                         $outputPage,
1782                                         'delete',
1783                                         $this->getTitle()
1784                                 );
1785                         } else {
1786                                 $outputPage->addHTML( $error );
1787                         }
1788                 }
1789         }
1790
1791         /* Caching functions */
1792
1793         /**
1794          * checkLastModified returns true if it has taken care of all
1795          * output to the client that is necessary for this request.
1796          * (that is, it has sent a cached version of the page)
1797          *
1798          * @return bool true if cached version send, false otherwise
1799          */
1800         protected function tryFileCache() {
1801                 static $called = false;
1802
1803                 if ( $called ) {
1804                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1805                         return false;
1806                 }
1807
1808                 $called = true;
1809                 if ( $this->isFileCacheable() ) {
1810                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1811                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1812                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1813                                 $cache->loadFromFileCache( $this->getContext() );
1814                                 return true;
1815                         } else {
1816                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1817                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1818                         }
1819                 } else {
1820                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1821                 }
1822
1823                 return false;
1824         }
1825
1826         /**
1827          * Check if the page can be cached
1828          * @return bool
1829          */
1830         public function isFileCacheable() {
1831                 $cacheable = false;
1832
1833                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1834                         $cacheable = $this->mPage->getID()
1835                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1836                         // Extension may have reason to disable file caching on some pages.
1837                         if ( $cacheable ) {
1838                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1839                         }
1840                 }
1841
1842                 return $cacheable;
1843         }
1844
1845         /**#@-*/
1846
1847         /**
1848          * Lightweight method to get the parser output for a page, checking the parser cache
1849          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1850          * consider, so it's not appropriate to use there.
1851          *
1852          * @since 1.16 (r52326) for LiquidThreads
1853          *
1854          * @param int|null $oldid Revision ID or null
1855          * @param User $user The relevant user
1856          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1857          */
1858         public function getParserOutput( $oldid = null, User $user = null ) {
1859                 //XXX: bypasses mParserOptions and thus setParserOptions()
1860
1861                 if ( $user === null ) {
1862                         $parserOptions = $this->getParserOptions();
1863                 } else {
1864                         $parserOptions = $this->mPage->makeParserOptions( $user );
1865                 }
1866
1867                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1868         }
1869
1870         /**
1871          * Override the ParserOptions used to render the primary article wikitext.
1872          *
1873          * @param ParserOptions $options
1874          * @throws MWException if the parser options where already initialized.
1875          */
1876         public function setParserOptions( ParserOptions $options ) {
1877                 if ( $this->mParserOptions ) {
1878                         throw new MWException( "can't change parser options after they have already been set" );
1879                 }
1880
1881                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1882                 $this->mParserOptions = clone $options;
1883         }
1884
1885         /**
1886          * Get parser options suitable for rendering the primary article wikitext
1887          * @return ParserOptions
1888          */
1889         public function getParserOptions() {
1890                 if ( !$this->mParserOptions ) {
1891                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1892                 }
1893                 // Clone to allow modifications of the return value without affecting cache
1894                 return clone $this->mParserOptions;
1895         }
1896
1897         /**
1898          * Sets the context this Article is executed in
1899          *
1900          * @param IContextSource $context
1901          * @since 1.18
1902          */
1903         public function setContext( $context ) {
1904                 $this->mContext = $context;
1905         }
1906
1907         /**
1908          * Gets the context this Article is executed in
1909          *
1910          * @return IContextSource
1911          * @since 1.18
1912          */
1913         public function getContext() {
1914                 if ( $this->mContext instanceof IContextSource ) {
1915                         return $this->mContext;
1916                 } else {
1917                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1918                                 "Return RequestContext::getMain(); for sanity\n" );
1919                         return RequestContext::getMain();
1920                 }
1921         }
1922
1923         /**
1924          * Use PHP's magic __get handler to handle accessing of
1925          * raw WikiPage fields for backwards compatibility.
1926          *
1927          * @param string $fname Field name
1928          */
1929         public function __get( $fname ) {
1930                 if ( property_exists( $this->mPage, $fname ) ) {
1931                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1932                         return $this->mPage->$fname;
1933                 }
1934                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1935         }
1936
1937         /**
1938          * Use PHP's magic __set handler to handle setting of
1939          * raw WikiPage fields for backwards compatibility.
1940          *
1941          * @param string $fname Field name
1942          * @param mixed $fvalue New value
1943          */
1944         public function __set( $fname, $fvalue ) {
1945                 if ( property_exists( $this->mPage, $fname ) ) {
1946                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1947                         $this->mPage->$fname = $fvalue;
1948                 // Note: extensions may want to toss on new fields
1949                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1950                         $this->mPage->$fname = $fvalue;
1951                 } else {
1952                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1953                 }
1954         }
1955
1956         /**
1957          * Use PHP's magic __call handler to transform instance calls to
1958          * WikiPage functions for backwards compatibility.
1959          *
1960          * @param string $fname Name of called method
1961          * @param array $args Arguments to the method
1962          * @return mixed
1963          */
1964         public function __call( $fname, $args ) {
1965                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1966                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1967                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1968                 }
1969                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1970         }
1971
1972         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1973
1974         /**
1975          * @param array $limit
1976          * @param array $expiry
1977          * @param bool $cascade
1978          * @param string $reason
1979          * @param User $user
1980          * @return Status
1981          */
1982         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
1983                 $reason, User $user
1984         ) {
1985                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
1986         }
1987
1988         /**
1989          * @param array $limit
1990          * @param string $reason
1991          * @param int $cascade
1992          * @param array $expiry
1993          * @return bool
1994          */
1995         public function updateRestrictions( $limit = array(), $reason = '',
1996                 &$cascade = 0, $expiry = array()
1997         ) {
1998                 return $this->mPage->doUpdateRestrictions(
1999                         $limit,
2000                         $expiry,
2001                         $cascade,
2002                         $reason,
2003                         $this->getContext()->getUser()
2004                 );
2005         }
2006
2007         /**
2008          * @param string $reason
2009          * @param bool $suppress
2010          * @param int $id
2011          * @param bool $commit
2012          * @param string $error
2013          * @return bool
2014          */
2015         public function doDeleteArticle( $reason, $suppress = false, $id = 0,
2016                 $commit = true, &$error = ''
2017         ) {
2018                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2019         }
2020
2021         /**
2022          * @param string $fromP
2023          * @param string $summary
2024          * @param string $token
2025          * @param bool $bot
2026          * @param array $resultDetails
2027          * @param User|null $user
2028          * @return array
2029          */
2030         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2031                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2032                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2033         }
2034
2035         /**
2036          * @param string $fromP
2037          * @param string $summary
2038          * @param bool $bot
2039          * @param array $resultDetails
2040          * @param User|null $guser
2041          * @return array
2042          */
2043         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2044                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2045                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2046         }
2047
2048         /**
2049          * @param bool $hasHistory
2050          * @return mixed
2051          */
2052         public function generateReason( &$hasHistory ) {
2053                 $title = $this->mPage->getTitle();
2054                 $handler = ContentHandler::getForTitle( $title );
2055                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2056         }
2057
2058         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2059
2060         /**
2061          * @return array
2062          *
2063          * @deprecated since 1.24, use WikiPage::selectFields() instead
2064          */
2065         public static function selectFields() {
2066                 wfDeprecated( __METHOD__, '1.24' );
2067                 return WikiPage::selectFields();
2068         }
2069
2070         /**
2071          * @param Title $title
2072          *
2073          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2074          */
2075         public static function onArticleCreate( $title ) {
2076                 wfDeprecated( __METHOD__, '1.24' );
2077                 WikiPage::onArticleCreate( $title );
2078         }
2079
2080         /**
2081          * @param Title $title
2082          *
2083          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2084          */
2085         public static function onArticleDelete( $title ) {
2086                 wfDeprecated( __METHOD__, '1.24' );
2087                 WikiPage::onArticleDelete( $title );
2088         }
2089
2090         /**
2091          * @param Title $title
2092          *
2093          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2094          */
2095         public static function onArticleEdit( $title ) {
2096                 wfDeprecated( __METHOD__, '1.24' );
2097                 WikiPage::onArticleEdit( $title );
2098         }
2099
2100         /**
2101          * @param string $oldtext
2102          * @param string $newtext
2103          * @param int $flags
2104          * @return string
2105          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2106          */
2107         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2108                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2109         }
2110         // ******
2111 }