includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo Move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  */
  34 class Article implements Page {
  35         /** @var IContextSource The context this Article is executed in */
  36         protected $mContext;
  37
  38         /** @var WikiPage The WikiPage object of this instance */
  39         protected $mPage;
  40
  41         /** @var ParserOptions ParserOptions object for $wgUser articles */
  42         public $mParserOptions;
  43
  44         /**
  45          * @var string Text of the revision we are working on
  46          * @todo BC cruft
  47          */
  48         public $mContent;
  49
  50         /**
  51          * @var Content Content of the revision we are working on
  52          * @since 1.21
  53          */
  54         public $mContentObject;
  55
  56         /** @var bool Is the content ($mContent) already loaded? */
  57         public $mContentLoaded = false;
  58
  59         /** @var int|null The oldid of the article that is to be shown, 0 for the current revision */
  60         public $mOldId;
  61
  62         /** @var Title Title from which we were redirected here */
  63         public $mRedirectedFrom = null;
  64
  65         /** @var string|bool URL to redirect to or false if none */
  66         public $mRedirectUrl = false;
  67
  68         /** @var int Revision ID of revision we are working on */
  69         public $mRevIdFetched = 0;
  70
  71         /** @var Revision Revision we are working on */
  72         public $mRevision = null;
  73
  74         /** @var ParserOutput */
  75         public $mParserOutput;
  76
  77         /**
  78          * Constructor and clear the article
  79          * @param Title $title Reference to a Title object.
  80          * @param int $oldId Revision ID, null to fetch from request, zero for current
  81          */
  82         public function __construct( Title $title, $oldId = null ) {
  83                 $this->mOldId = $oldId;
  84                 $this->mPage = $this->newPage( $title );
  85         }
  86
  87         /**
  88          * @param Title $title
  89          * @return WikiPage
  90          */
  91         protected function newPage( Title $title ) {
  92                 return new WikiPage( $title );
  93         }
  94
  95         /**
  96          * Constructor from a page id
  97          * @param int $id Article ID to load
  98          * @return Article|null
  99          */
 100         public static function newFromID( $id ) {
 101                 $t = Title::newFromID( $id );
 102                 # @todo FIXME: Doesn't inherit right
 103                 return $t == null ? null : new self( $t );
 104                 # return $t == null ? null : new static( $t ); // PHP 5.3
 105         }
 106
 107         /**
 108          * Create an Article object of the appropriate class for the given page.
 109          *
 110          * @param Title $title
 111          * @param IContextSource $context
 112          * @return Article
 113          */
 114         public static function newFromTitle( $title, IContextSource $context ) {
 115                 if ( NS_MEDIA == $title->getNamespace() ) {
 116                         // FIXME: where should this go?
 117                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 118                 }
 119
 120                 $page = null;
 121                 Hooks::run( 'ArticleFromTitle', array( &$title, &$page, $context ) );
 122                 if ( !$page ) {
 123                         switch ( $title->getNamespace() ) {
 124                                 case NS_FILE:
 125                                         $page = new ImagePage( $title );
 126                                         break;
 127                                 case NS_CATEGORY:
 128                                         $page = new CategoryPage( $title );
 129                                         break;
 130                                 default:
 131                                         $page = new Article( $title );
 132                         }
 133                 }
 134                 $page->setContext( $context );
 135
 136                 return $page;
 137         }
 138
 139         /**
 140          * Create an Article object of the appropriate class for the given page.
 141          *
 142          * @param WikiPage $page
 143          * @param IContextSource $context
 144          * @return Article
 145          */
 146         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 147                 $article = self::newFromTitle( $page->getTitle(), $context );
 148                 $article->mPage = $page; // override to keep process cached vars
 149                 return $article;
 150         }
 151
 152         /**
 153          * Tell the page view functions that this view was redirected
 154          * from another page on the wiki.
 155          * @param Title $from
 156          */
 157         public function setRedirectedFrom( Title $from ) {
 158                 $this->mRedirectedFrom = $from;
 159         }
 160
 161         /**
 162          * Get the title object of the article
 163          *
 164          * @return Title Title object of this page
 165          */
 166         public function getTitle() {
 167                 return $this->mPage->getTitle();
 168         }
 169
 170         /**
 171          * Get the WikiPage object of this instance
 172          *
 173          * @since 1.19
 174          * @return WikiPage
 175          */
 176         public function getPage() {
 177                 return $this->mPage;
 178         }
 179
 180         /**
 181          * Clear the object
 182          */
 183         public function clear() {
 184                 $this->mContentLoaded = false;
 185
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRevIdFetched = 0;
 188                 $this->mRedirectUrl = false;
 189
 190                 $this->mPage->clear();
 191         }
 192
 193         /**
 194          * Note that getContent/loadContent do not follow redirects anymore.
 195          * If you need to fetch redirectable content easily, try
 196          * the shortcut in WikiPage::getRedirectTarget()
 197          *
 198          * This function has side effects! Do not use this function if you
 199          * only want the real revision text if any.
 200          *
 201          * @deprecated since 1.21; use WikiPage::getContent() instead
 202          *
 203          * @return string Return the text of this revision
 204          */
 205         public function getContent() {
 206                 ContentHandler::deprecated( __METHOD__, '1.21' );
 207                 $content = $this->getContentObject();
 208                 return ContentHandler::getContentText( $content );
 209         }
 210
 211         /**
 212          * Returns a Content object representing the pages effective display content,
 213          * not necessarily the revision's content!
 214          *
 215          * Note that getContent/loadContent do not follow redirects anymore.
 216          * If you need to fetch redirectable content easily, try
 217          * the shortcut in WikiPage::getRedirectTarget()
 218          *
 219          * This function has side effects! Do not use this function if you
 220          * only want the real revision text if any.
 221          *
 222          * @return Content Return the content of this revision
 223          *
 224          * @since 1.21
 225          */
 226         protected function getContentObject() {
 227
 228                 if ( $this->mPage->getID() === 0 ) {
 229                         # If this is a MediaWiki:x message, then load the messages
 230                         # and return the message value for x.
 231                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 232                                 $text = $this->getTitle()->getDefaultMessageText();
 233                                 if ( $text === false ) {
 234                                         $text = '';
 235                                 }
 236
 237                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 238                         } else {
 239                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 240                                 $content = new MessageContent( $message, null, 'parsemag' );
 241                         }
 242                 } else {
 243                         $this->fetchContentObject();
 244                         $content = $this->mContentObject;
 245                 }
 246
 247                 return $content;
 248         }
 249
 250         /**
 251          * @return int The oldid of the article that is to be shown, 0 for the current revision
 252          */
 253         public function getOldID() {
 254                 if ( is_null( $this->mOldId ) ) {
 255                         $this->mOldId = $this->getOldIDFromRequest();
 256                 }
 257
 258                 return $this->mOldId;
 259         }
 260
 261         /**
 262          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 263          *
 264          * @return int The old id for the request
 265          */
 266         public function getOldIDFromRequest() {
 267                 $this->mRedirectUrl = false;
 268
 269                 $request = $this->getContext()->getRequest();
 270                 $oldid = $request->getIntOrNull( 'oldid' );
 271
 272                 if ( $oldid === null ) {
 273                         return 0;
 274                 }
 275
 276                 if ( $oldid !== 0 ) {
 277                         # Load the given revision and check whether the page is another one.
 278                         # In that case, update this instance to reflect the change.
 279                         if ( $oldid === $this->mPage->getLatest() ) {
 280                                 $this->mRevision = $this->mPage->getRevision();
 281                         } else {
 282                                 $this->mRevision = Revision::newFromId( $oldid );
 283                                 if ( $this->mRevision !== null ) {
 284                                         // Revision title doesn't match the page title given?
 285                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 286                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 287                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 288                                         }
 289                                 }
 290                         }
 291                 }
 292
 293                 if ( $request->getVal( 'direction' ) == 'next' ) {
 294                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 295                         if ( $nextid ) {
 296                                 $oldid = $nextid;
 297                                 $this->mRevision = null;
 298                         } else {
 299                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 300                         }
 301                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 302                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 303                         if ( $previd ) {
 304                                 $oldid = $previd;
 305                                 $this->mRevision = null;
 306                         }
 307                 }
 308
 309                 return $oldid;
 310         }
 311
 312         /**
 313          * Load the revision (including text) into this object
 314          *
 315          * @deprecated since 1.19; use fetchContent()
 316          */
 317         function loadContent() {
 318                 wfDeprecated( __METHOD__, '1.19' );
 319                 $this->fetchContent();
 320         }
 321
 322         /**
 323          * Get text of an article from database
 324          * Does *NOT* follow redirects.
 325          *
 326          * @protected
 327          * @note This is really internal functionality that should really NOT be
 328          * used by other functions. For accessing article content, use the WikiPage
 329          * class, especially WikiBase::getContent(). However, a lot of legacy code
 330          * uses this method to retrieve page text from the database, so the function
 331          * has to remain public for now.
 332          *
 333          * @return string|bool String containing article contents, or false if null
 334          * @deprecated since 1.21, use WikiPage::getContent() instead
 335          */
 336         function fetchContent() { #BC cruft!
 337                 ContentHandler::deprecated( __METHOD__, '1.21' );
 338
 339                 if ( $this->mContentLoaded && $this->mContent ) {
 340                         return $this->mContent;
 341                 }
 342
 343                 $content = $this->fetchContentObject();
 344
 345                 if ( !$content ) {
 346                         return false;
 347                 }
 348
 349                 // @todo Get rid of mContent everywhere!
 350                 $this->mContent = ContentHandler::getContentText( $content );
 351                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 352
 353                 return $this->mContent;
 354         }
 355
 356         /**
 357          * Get text content object
 358          * Does *NOT* follow redirects.
 359          * @todo When is this null?
 360          *
 361          * @note Code that wants to retrieve page content from the database should
 362          * use WikiPage::getContent().
 363          *
 364          * @return Content|null|bool
 365          *
 366          * @since 1.21
 367          */
 368         protected function fetchContentObject() {
 369                 if ( $this->mContentLoaded ) {
 370                         return $this->mContentObject;
 371                 }
 372
 373                 $this->mContentLoaded = true;
 374                 $this->mContent = null;
 375
 376                 $oldid = $this->getOldID();
 377
 378                 # Pre-fill content with error message so that if something
 379                 # fails we'll have something telling us what we intended.
 380                 //XXX: this isn't page content but a UI message. horrible.
 381                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ) );
 382
 383                 if ( $oldid ) {
 384                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 385                         if ( !$this->mRevision ) {
 386                                 $this->mRevision = Revision::newFromId( $oldid );
 387                                 if ( !$this->mRevision ) {
 388                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 389                                         return false;
 390                                 }
 391                         }
 392                 } else {
 393                         $oldid = $this->mPage->getLatest();
 394                         if ( !$oldid ) {
 395                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 396                                         $this->getTitle()->getPrefixedText() . "\n" );
 397                                 return false;
 398                         }
 399
 400                         # Update error message with correct oldid
 401                         $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ) );
 402
 403                         $this->mRevision = $this->mPage->getRevision();
 404
 405                         if ( !$this->mRevision ) {
 406                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id $oldid\n" );
 407                                 return false;
 408                         }
 409                 }
 410
 411                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 412                 // We should instead work with the Revision object when we need it...
 413                 // Loads if user is allowed
 414                 $content = $this->mRevision->getContent(
 415                         Revision::FOR_THIS_USER,
 416                         $this->getContext()->getUser()
 417                 );
 418
 419                 if ( !$content ) {
 420                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 421                                 $this->mRevision->getId() . "\n" );
 422                         return false;
 423                 }
 424
 425                 $this->mContentObject = $content;
 426                 $this->mRevIdFetched = $this->mRevision->getId();
 427
 428                 Hooks::run( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 429
 430                 return $this->mContentObject;
 431         }
 432
 433         /**
 434          * Returns true if the currently-referenced revision is the current edit
 435          * to this page (and it exists).
 436          * @return bool
 437          */
 438         public function isCurrent() {
 439                 # If no oldid, this is the current version.
 440                 if ( $this->getOldID() == 0 ) {
 441                         return true;
 442                 }
 443
 444                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 445         }
 446
 447         /**
 448          * Get the fetched Revision object depending on request parameters or null
 449          * on failure.
 450          *
 451          * @since 1.19
 452          * @return Revision|null
 453          */
 454         public function getRevisionFetched() {
 455                 $this->fetchContentObject();
 456
 457                 return $this->mRevision;
 458         }
 459
 460         /**
 461          * Use this to fetch the rev ID used on page views
 462          *
 463          * @return int Revision ID of last article revision
 464          */
 465         public function getRevIdFetched() {
 466                 if ( $this->mRevIdFetched ) {
 467                         return $this->mRevIdFetched;
 468                 } else {
 469                         return $this->mPage->getLatest();
 470                 }
 471         }
 472
 473         /**
 474          * This is the default action of the index.php entry point: just view the
 475          * page of the given title.
 476          */
 477         public function view() {
 478                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar, $wgMaxRedirects;
 479
 480                 # Get variables from query string
 481                 # As side effect this will load the revision and update the title
 482                 # in a revision ID is passed in the request, so this should remain
 483                 # the first call of this method even if $oldid is used way below.
 484                 $oldid = $this->getOldID();
 485
 486                 $user = $this->getContext()->getUser();
 487                 # Another whitelist check in case getOldID() is altering the title
 488                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 489                 if ( count( $permErrors ) ) {
 490                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 491                         throw new PermissionsError( 'read', $permErrors );
 492                 }
 493
 494                 $outputPage = $this->getContext()->getOutput();
 495                 # getOldID() may as well want us to redirect somewhere else
 496                 if ( $this->mRedirectUrl ) {
 497                         $outputPage->redirect( $this->mRedirectUrl );
 498                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 499
 500                         return;
 501                 }
 502
 503                 # If we got diff in the query, we want to see a diff page instead of the article.
 504                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 505                         wfDebug( __METHOD__ . ": showing diff page\n" );
 506                         $this->showDiffPage();
 507
 508                         return;
 509                 }
 510
 511                 # Set page title (may be overridden by DISPLAYTITLE)
 512                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 513
 514                 $outputPage->setArticleFlag( true );
 515                 # Allow frames by default
 516                 $outputPage->allowClickjacking();
 517
 518                 $parserCache = ParserCache::singleton();
 519
 520                 $parserOptions = $this->getParserOptions();
 521                 # Render printable version, use printable version cache
 522                 if ( $outputPage->isPrintable() ) {
 523                         $parserOptions->setIsPrintable( true );
 524                         $parserOptions->setEditSection( false );
 525                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 526                         $parserOptions->setEditSection( false );
 527                 }
 528
 529                 # Try client and file cache
 530                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 531                         if ( $wgUseETag ) {
 532                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 533                         }
 534
 535                         # Use the greatest of the page's timestamp or the timestamp of any
 536                         # redirect in the chain (bug 67849)
 537                         $timestamp = $this->mPage->getTouched();
 538                         if ( isset( $this->mRedirectedFrom ) ) {
 539                                 $timestamp = max( $timestamp, $this->mRedirectedFrom->getTouched() );
 540
 541                                 # If there can be more than one redirect in the chain, we have
 542                                 # to go through the whole chain too in case an intermediate
 543                                 # redirect was changed.
 544                                 if ( $wgMaxRedirects > 1 ) {
 545                                         $titles = Revision::newFromTitle( $this->mRedirectedFrom )
 546                                                 ->getContent( Revision::FOR_THIS_USER, $user )
 547                                                 ->getRedirectChain();
 548                                         $thisTitle = $this->getTitle();
 549                                         foreach ( $titles as $title ) {
 550                                                 if ( Title::compare( $title, $thisTitle ) === 0 ) {
 551                                                         break;
 552                                                 }
 553                                                 $timestamp = max( $timestamp, $title->getTouched() );
 554                                         }
 555                                 }
 556                         }
 557
 558                         # Is it client cached?
 559                         if ( $outputPage->checkLastModified( $timestamp ) ) {
 560                                 wfDebug( __METHOD__ . ": done 304\n" );
 561
 562                                 return;
 563                         # Try file cache
 564                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 565                                 wfDebug( __METHOD__ . ": done file cache\n" );
 566                                 # tell wgOut that output is taken care of
 567                                 $outputPage->disable();
 568                                 $this->mPage->doViewUpdates( $user, $oldid );
 569
 570                                 return;
 571                         }
 572                 }
 573
 574                 # Should the parser cache be used?
 575                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 576                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 577                 if ( $user->getStubThreshold() ) {
 578                         $this->getContext()->getStats()->increment( 'pcache_miss_stub' );
 579                 }
 580
 581                 $this->showRedirectedFromHeader();
 582                 $this->showNamespaceHeader();
 583
 584                 # Iterate through the possible ways of constructing the output text.
 585                 # Keep going until $outputDone is set, or we run out of things to do.
 586                 $pass = 0;
 587                 $outputDone = false;
 588                 $this->mParserOutput = false;
 589
 590                 while ( !$outputDone && ++$pass ) {
 591                         switch ( $pass ) {
 592                                 case 1:
 593                                         Hooks::run( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 594                                         break;
 595                                 case 2:
 596                                         # Early abort if the page doesn't exist
 597                                         if ( !$this->mPage->exists() ) {
 598                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 599                                                 $this->showMissingArticle();
 600                                                 $this->mPage->doViewUpdates( $user );
 601                                                 return;
 602                                         }
 603
 604                                         # Try the parser cache
 605                                         if ( $useParserCache ) {
 606                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 607
 608                                                 if ( $this->mParserOutput !== false ) {
 609                                                         if ( $oldid ) {
 610                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 611                                                                 $this->setOldSubtitle( $oldid );
 612                                                         } else {
 613                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 614                                                         }
 615                                                         $outputPage->addParserOutput( $this->mParserOutput );
 616                                                         # Ensure that UI elements requiring revision ID have
 617                                                         # the correct version information.
 618                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 619                                                         # Preload timestamp to avoid a DB hit
 620                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 621                                                         if ( $cachedTimestamp !== null ) {
 622                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 623                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 624                                                         }
 625                                                         $outputDone = true;
 626                                                 }
 627                                         }
 628                                         break;
 629                                 case 3:
 630                                         # This will set $this->mRevision if needed
 631                                         $this->fetchContentObject();
 632
 633                                         # Are we looking at an old revision
 634                                         if ( $oldid && $this->mRevision ) {
 635                                                 $this->setOldSubtitle( $oldid );
 636
 637                                                 if ( !$this->showDeletedRevisionHeader() ) {
 638                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 639                                                         return;
 640                                                 }
 641                                         }
 642
 643                                         # Ensure that UI elements requiring revision ID have
 644                                         # the correct version information.
 645                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 646                                         # Preload timestamp to avoid a DB hit
 647                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 648
 649                                         # Pages containing custom CSS or JavaScript get special treatment
 650                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 651                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 652                                                 $this->showCssOrJsPage();
 653                                                 $outputDone = true;
 654                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 655                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 656
 657                                                 # Allow extensions do their own custom view for certain pages
 658                                                 $outputDone = true;
 659                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 660                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 661
 662                                                 # Allow extensions do their own custom view for certain pages
 663                                                 $outputDone = true;
 664                                         }
 665                                         break;
 666                                 case 4:
 667                                         # Run the parse, protected by a pool counter
 668                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 669
 670                                         $content = $this->getContentObject();
 671                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 672                                                 $this->getRevIdFetched(), $useParserCache, $content );
 673
 674                                         if ( !$poolArticleView->execute() ) {
 675                                                 $error = $poolArticleView->getError();
 676                                                 if ( $error ) {
 677                                                         $outputPage->clearHTML(); // for release() errors
 678                                                         $outputPage->enableClientCache( false );
 679                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 680
 681                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 682                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 683                                                 }
 684                                                 # Connection or timeout error
 685                                                 return;
 686                                         }
 687
 688                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 689                                         $outputPage->addParserOutput( $this->mParserOutput );
 690                                         if ( $content->getRedirectTarget() ) {
 691                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 692                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 693                                         }
 694
 695                                         # Don't cache a dirty ParserOutput object
 696                                         if ( $poolArticleView->getIsDirty() ) {
 697                                                 $outputPage->setSquidMaxage( 0 );
 698                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 699                                                         "sending anyway due to pool overload-->\n" );
 700                                         }
 701
 702                                         $outputDone = true;
 703                                         break;
 704                                 # Should be unreachable, but just in case...
 705                                 default:
 706                                         break 2;
 707                         }
 708                 }
 709
 710                 # Get the ParserOutput actually *displayed* here.
 711                 # Note that $this->mParserOutput is the *current*/oldid version output.
 712                 $pOutput = ( $outputDone instanceof ParserOutput )
 713                         ? $outputDone // object fetched by hook
 714                         : $this->mParserOutput;
 715
 716                 # Adjust title for main page & pages with displaytitle
 717                 if ( $pOutput ) {
 718                         $this->adjustDisplayTitle( $pOutput );
 719                 }
 720
 721                 # For the main page, overwrite the <title> element with the con-
 722                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 723                 # that's not empty).
 724                 # This message always exists because it is in the i18n files
 725                 if ( $this->getTitle()->isMainPage() ) {
 726                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 727                         if ( !$msg->isDisabled() ) {
 728                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 729                         }
 730                 }
 731
 732                 # Check for any __NOINDEX__ tags on the page using $pOutput
 733                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 734                 $outputPage->setIndexPolicy( $policy['index'] );
 735                 $outputPage->setFollowPolicy( $policy['follow'] );
 736
 737                 $this->showViewFooter();
 738                 $this->mPage->doViewUpdates( $user, $oldid );
 739
 740                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 741
 742         }
 743
 744         /**
 745          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 746          * @param ParserOutput $pOutput
 747          */
 748         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 749                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 750                 $titleText = $pOutput->getTitleText();
 751                 if ( strval( $titleText ) !== '' ) {
 752                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 753                 }
 754         }
 755
 756         /**
 757          * Show a diff page according to current request variables. For use within
 758          * Article::view() only, other callers should use the DifferenceEngine class.
 759          *
 760          */
 761         protected function showDiffPage() {
 762                 $request = $this->getContext()->getRequest();
 763                 $user = $this->getContext()->getUser();
 764                 $diff = $request->getVal( 'diff' );
 765                 $rcid = $request->getVal( 'rcid' );
 766                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 767                 $purge = $request->getVal( 'action' ) == 'purge';
 768                 $unhide = $request->getInt( 'unhide' ) == 1;
 769                 $oldid = $this->getOldID();
 770
 771                 $rev = $this->getRevisionFetched();
 772
 773                 if ( !$rev ) {
 774                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 775                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 776                                 ->params( $oldid )
 777                                 ->numParams( 1 )
 778                                 ->parseAsBlock();
 779                         $this->getContext()->getOutput()->addHtml( $msg );
 780                         return;
 781                 }
 782
 783                 $contentHandler = $rev->getContentHandler();
 784                 $de = $contentHandler->createDifferenceEngine(
 785                         $this->getContext(),
 786                         $oldid,
 787                         $diff,
 788                         $rcid,
 789                         $purge,
 790                         $unhide
 791                 );
 792
 793                 // DifferenceEngine directly fetched the revision:
 794                 $this->mRevIdFetched = $de->mNewid;
 795                 $de->showDiffPage( $diffOnly );
 796
 797                 // Run view updates for the newer revision being diffed (and shown
 798                 // below the diff if not $diffOnly).
 799                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 800                 // New can be false, convert it to 0 - this conveniently means the latest revision
 801                 $this->mPage->doViewUpdates( $user, (int)$new );
 802         }
 803
 804         /**
 805          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 806          * Article::view() only.
 807          *
 808          * This exists mostly to serve the deprecated ShowRawCssJs hook (used to customize these views).
 809          * It has been replaced by the ContentGetParserOutput hook, which lets you do the same but with
 810          * more flexibility.
 811          *
 812          * @param bool $showCacheHint Whether to show a message telling the user
 813          *   to clear the browser cache (default: true).
 814          */
 815         protected function showCssOrJsPage( $showCacheHint = true ) {
 816                 $outputPage = $this->getContext()->getOutput();
 817
 818                 if ( $showCacheHint ) {
 819                         $dir = $this->getContext()->getLanguage()->getDir();
 820                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
 821
 822                         $outputPage->wrapWikiMsg(
 823                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 824                                 'clearyourcache'
 825                         );
 826                 }
 827
 828                 $this->fetchContentObject();
 829
 830                 if ( $this->mContentObject ) {
 831                         // Give hooks a chance to customise the output
 832                         if ( ContentHandler::runLegacyHooks(
 833                                 'ShowRawCssJs',
 834                                 array( $this->mContentObject, $this->getTitle(), $outputPage ) )
 835                         ) {
 836                                 // If no legacy hooks ran, display the content of the parser output, including RL modules,
 837                                 // but excluding metadata like categories and language links
 838                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 839                                 $outputPage->addParserOutputContent( $po );
 840                         }
 841                 }
 842         }
 843
 844         /**
 845          * Get the robot policy to be used for the current view
 846          * @param string $action The action= GET parameter
 847          * @param ParserOutput|null $pOutput
 848          * @return array The policy that should be set
 849          * @todo actions other than 'view'
 850          */
 851         public function getRobotPolicy( $action, $pOutput = null ) {
 852                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 853
 854                 $ns = $this->getTitle()->getNamespace();
 855
 856                 # Don't index user and user talk pages for blocked users (bug 11443)
 857                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 858                         $specificTarget = null;
 859                         $vagueTarget = null;
 860                         $titleText = $this->getTitle()->getText();
 861                         if ( IP::isValid( $titleText ) ) {
 862                                 $vagueTarget = $titleText;
 863                         } else {
 864                                 $specificTarget = $titleText;
 865                         }
 866                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 867                                 return array(
 868                                         'index' => 'noindex',
 869                                         'follow' => 'nofollow'
 870                                 );
 871                         }
 872                 }
 873
 874                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 875                         # Non-articles (special pages etc), and old revisions
 876                         return array(
 877                                 'index' => 'noindex',
 878                                 'follow' => 'nofollow'
 879                         );
 880                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 881                         # Discourage indexing of printable versions, but encourage following
 882                         return array(
 883                                 'index' => 'noindex',
 884                                 'follow' => 'follow'
 885                         );
 886                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 887                         # For ?curid=x urls, disallow indexing
 888                         return array(
 889                                 'index' => 'noindex',
 890                                 'follow' => 'follow'
 891                         );
 892                 }
 893
 894                 # Otherwise, construct the policy based on the various config variables.
 895                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 896
 897                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 898                         # Honour customised robot policies for this namespace
 899                         $policy = array_merge(
 900                                 $policy,
 901                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 902                         );
 903                 }
 904                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 905                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 906                         # a final sanity check that we have really got the parser output.
 907                         $policy = array_merge(
 908                                 $policy,
 909                                 array( 'index' => $pOutput->getIndexPolicy() )
 910                         );
 911                 }
 912
 913                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 914                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 915                         $policy = array_merge(
 916                                 $policy,
 917                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 918                         );
 919                 }
 920
 921                 return $policy;
 922         }
 923
 924         /**
 925          * Converts a String robot policy into an associative array, to allow
 926          * merging of several policies using array_merge().
 927          * @param array|string $policy Returns empty array on null/false/'', transparent
 928          *   to already-converted arrays, converts string.
 929          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 930          */
 931         public static function formatRobotPolicy( $policy ) {
 932                 if ( is_array( $policy ) ) {
 933                         return $policy;
 934                 } elseif ( !$policy ) {
 935                         return array();
 936                 }
 937
 938                 $policy = explode( ',', $policy );
 939                 $policy = array_map( 'trim', $policy );
 940
 941                 $arr = array();
 942                 foreach ( $policy as $var ) {
 943                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 944                                 $arr['index'] = $var;
 945                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 946                                 $arr['follow'] = $var;
 947                         }
 948                 }
 949
 950                 return $arr;
 951         }
 952
 953         /**
 954          * If this request is a redirect view, send "redirected from" subtitle to
 955          * the output. Returns true if the header was needed, false if this is not
 956          * a redirect view. Handles both local and remote redirects.
 957          *
 958          * @return bool
 959          */
 960         public function showRedirectedFromHeader() {
 961                 global $wgRedirectSources;
 962
 963                 $context = $this->getContext();
 964                 $outputPage = $context->getOutput();
 965                 $request = $context->getRequest();
 966                 $rdfrom = $request->getVal( 'rdfrom' );
 967
 968                 // Construct a URL for the current page view, but with the target title
 969                 $query = $request->getValues();
 970                 unset( $query['rdfrom'] );
 971                 unset( $query['title'] );
 972                 if ( $this->getTitle()->isRedirect() ) {
 973                         // Prevent double redirects
 974                         $query['redirect'] = 'no';
 975                 }
 976                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 977
 978                 if ( isset( $this->mRedirectedFrom ) ) {
 979                         // This is an internally redirected page view.
 980                         // We'll need a backlink to the source page for navigation.
 981                         if ( Hooks::run( 'ArticleViewRedirect', array( &$this ) ) ) {
 982                                 $redir = Linker::linkKnown(
 983                                         $this->mRedirectedFrom,
 984                                         null,
 985                                         array(),
 986                                         array( 'redirect' => 'no' )
 987                                 );
 988
 989                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 990                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 991                                 . "</span>" );
 992
 993                                 // Add the script to update the displayed URL and
 994                                 // set the fragment if one was specified in the redirect
 995                                 $outputPage->addJsConfigVars( array(
 996                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 997                                 ) );
 998                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 999
1000                                 // Add a <link rel="canonical"> tag
1001                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
1002
1003                                 // Tell the output object that the user arrived at this article through a redirect
1004                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1005
1006                                 return true;
1007                         }
1008                 } elseif ( $rdfrom ) {
1009                         // This is an externally redirected view, from some other wiki.
1010                         // If it was reported from a trusted site, supply a backlink.
1011                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1012                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1013                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1014                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1015                                 . "</span>" );
1016
1017                                 // Add the script to update the displayed URL
1018                                 $outputPage->addJsConfigVars( array(
1019                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1020                                 ) );
1021                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1022
1023                                 return true;
1024                         }
1025                 }
1026
1027                 return false;
1028         }
1029
1030         /**
1031          * Show a header specific to the namespace currently being viewed, like
1032          * [[MediaWiki:Talkpagetext]]. For Article::view().
1033          */
1034         public function showNamespaceHeader() {
1035                 if ( $this->getTitle()->isTalkPage() ) {
1036                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1037                                 $this->getContext()->getOutput()->wrapWikiMsg(
1038                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1039                                         array( 'talkpageheader' )
1040                                 );
1041                         }
1042                 }
1043         }
1044
1045         /**
1046          * Show the footer section of an ordinary page view
1047          */
1048         public function showViewFooter() {
1049                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1050                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1051                         && IP::isValid( $this->getTitle()->getText() )
1052                 ) {
1053                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1054                 }
1055
1056                 // Show a footer allowing the user to patrol the shown revision or page if possible
1057                 $patrolFooterShown = $this->showPatrolFooter();
1058
1059                 Hooks::run( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1060         }
1061
1062         /**
1063          * If patrol is possible, output a patrol UI box. This is called from the
1064          * footer section of ordinary page views. If patrol is not possible or not
1065          * desired, does nothing.
1066          * Side effect: When the patrol link is build, this method will call
1067          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1068          *
1069          * @return bool
1070          */
1071         public function showPatrolFooter() {
1072                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1073
1074                 $outputPage = $this->getContext()->getOutput();
1075                 $user = $this->getContext()->getUser();
1076                 $cache = wfGetMainCache();
1077                 $rc = false;
1078
1079                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user )
1080                         || !( $wgUseRCPatrol || $wgUseNPPatrol )
1081                 ) {
1082                         // Patrolling is disabled or the user isn't allowed to
1083                         return false;
1084                 }
1085
1086                 // New page patrol: Get the timestamp of the oldest revison which
1087                 // the revision table holds for the given page. Then we look
1088                 // whether it's within the RC lifespan and if it is, we try
1089                 // to get the recentchanges row belonging to that entry
1090                 // (with rc_new = 1).
1091
1092                 // Check for cached results
1093                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1094                         return false;
1095                 }
1096
1097                 if ( $this->mRevision
1098                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1099                 ) {
1100                         // The current revision is already older than what could be in the RC table
1101                         // 6h tolerance because the RC might not be cleaned out regularly
1102                         return false;
1103                 }
1104
1105                 $dbr = wfGetDB( DB_SLAVE );
1106                 $oldestRevisionTimestamp = $dbr->selectField(
1107                         'revision',
1108                         'MIN( rev_timestamp )',
1109                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1110                         __METHOD__
1111                 );
1112
1113                 if ( $oldestRevisionTimestamp
1114                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1115                 ) {
1116                         // 6h tolerance because the RC might not be cleaned out regularly
1117                         $rc = RecentChange::newFromConds(
1118                                 array(
1119                                         'rc_new' => 1,
1120                                         'rc_timestamp' => $oldestRevisionTimestamp,
1121                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1122                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1123                                         'rc_patrolled' => 0
1124                                 ),
1125                                 __METHOD__,
1126                                 array( 'USE INDEX' => 'new_name_timestamp' )
1127                         );
1128                 }
1129
1130                 if ( !$rc ) {
1131                         // No RC entry around
1132
1133                         // Cache the information we gathered above in case we can't patrol
1134                         // Don't cache in case we can patrol as this could change
1135                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1136
1137                         return false;
1138                 }
1139
1140                 if ( $rc->getPerformer()->equals( $user ) ) {
1141                         // Don't show a patrol link for own creations. If the user could
1142                         // patrol them, they already would be patrolled
1143                         return false;
1144                 }
1145
1146                 $rcid = $rc->getAttribute( 'rc_id' );
1147
1148                 $token = $user->getEditToken( $rcid );
1149
1150                 $outputPage->preventClickjacking();
1151                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1152                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1153                 }
1154
1155                 $link = Linker::linkKnown(
1156                         $this->getTitle(),
1157                         wfMessage( 'markaspatrolledtext' )->escaped(),
1158                         array(),
1159                         array(
1160                                 'action' => 'markpatrolled',
1161                                 'rcid' => $rcid,
1162                                 'token' => $token,
1163                         )
1164                 );
1165
1166                 $outputPage->addHTML(
1167                         "<div class='patrollink'>" .
1168                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1169                         '</div>'
1170                 );
1171
1172                 return true;
1173         }
1174
1175         /**
1176          * Show the error text for a missing article. For articles in the MediaWiki
1177          * namespace, show the default message text. To be called from Article::view().
1178          */
1179         public function showMissingArticle() {
1180                 global $wgSend404Code;
1181
1182                 $outputPage = $this->getContext()->getOutput();
1183                 // Whether the page is a root user page of an existing user (but not a subpage)
1184                 $validUserPage = false;
1185
1186                 $title = $this->getTitle();
1187
1188                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1189                 if ( $title->getNamespace() == NS_USER
1190                         || $title->getNamespace() == NS_USER_TALK
1191                 ) {
1192                         $parts = explode( '/', $title->getText() );
1193                         $rootPart = $parts[0];
1194                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1195                         $ip = User::isIP( $rootPart );
1196                         $block = Block::newFromTarget( $user, $user );
1197
1198                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1199                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1200                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1201                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1202                                 # Show log extract if the user is currently blocked
1203                                 LogEventsList::showLogExtract(
1204                                         $outputPage,
1205                                         'block',
1206                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1207                                         '',
1208                                         array(
1209                                                 'lim' => 1,
1210                                                 'showIfEmpty' => false,
1211                                                 'msgKey' => array(
1212                                                         'blocked-notice-logextract',
1213                                                         $user->getName() # Support GENDER in notice
1214                                                 )
1215                                         )
1216                                 );
1217                                 $validUserPage = !$title->isSubpage();
1218                         } else {
1219                                 $validUserPage = !$title->isSubpage();
1220                         }
1221                 }
1222
1223                 Hooks::run( 'ShowMissingArticle', array( $this ) );
1224
1225                 // Give extensions a chance to hide their (unrelated) log entries
1226                 $logTypes = array( 'delete', 'move' );
1227                 $conds = array( "log_action != 'revision'" );
1228                 Hooks::run( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1229
1230                 # Show delete and move logs
1231                 LogEventsList::showLogExtract( $outputPage, $logTypes, $title, '',
1232                         array( 'lim' => 10,
1233                                 'conds' => $conds,
1234                                 'showIfEmpty' => false,
1235                                 'msgKey' => array( 'moveddeleted-notice' ) )
1236                 );
1237
1238                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1239                         // If there's no backing content, send a 404 Not Found
1240                         // for better machine handling of broken links.
1241                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1242                 }
1243
1244                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1245                 $policy = $this->getRobotPolicy( 'view' );
1246                 $outputPage->setIndexPolicy( $policy['index'] );
1247                 $outputPage->setFollowPolicy( $policy['follow'] );
1248
1249                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', array( $this ) );
1250
1251                 if ( !$hookResult ) {
1252                         return;
1253                 }
1254
1255                 # Show error message
1256                 $oldid = $this->getOldID();
1257                 if ( $oldid ) {
1258                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1259                 } elseif ( $title->getNamespace() === NS_MEDIAWIKI ) {
1260                         // Use the default message text
1261                         $text = $title->getDefaultMessageText();
1262                 } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1263                         && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1264                 ) {
1265                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1266                         $text = wfMessage( $message )->plain();
1267                 } else {
1268                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1269                 }
1270                 $text = "<div class='noarticletext'>\n$text\n</div>";
1271
1272                 $outputPage->addWikiText( $text );
1273         }
1274
1275         /**
1276          * If the revision requested for view is deleted, check permissions.
1277          * Send either an error message or a warning header to the output.
1278          *
1279          * @return bool True if the view is allowed, false if not.
1280          */
1281         public function showDeletedRevisionHeader() {
1282                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1283                         // Not deleted
1284                         return true;
1285                 }
1286
1287                 $outputPage = $this->getContext()->getOutput();
1288                 $user = $this->getContext()->getUser();
1289                 // If the user is not allowed to see it...
1290                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1291                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1292                                 'rev-deleted-text-permission' );
1293
1294                         return false;
1295                 // If the user needs to confirm that they want to see it...
1296                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1297                         # Give explanation and add a link to view the revision...
1298                         $oldid = intval( $this->getOldID() );
1299                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1300                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1301                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1302                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1303                                 array( $msg, $link ) );
1304
1305                         return false;
1306                 // We are allowed to see...
1307                 } else {
1308                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1309                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1310                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1311
1312                         return true;
1313                 }
1314         }
1315
1316         /**
1317          * Generate the navigation links when browsing through an article revisions
1318          * It shows the information as:
1319          *   Revision as of \<date\>; view current revision
1320          *   \<- Previous version | Next Version -\>
1321          *
1322          * @param int $oldid Revision ID of this article revision
1323          */
1324         public function setOldSubtitle( $oldid = 0 ) {
1325                 if ( !Hooks::run( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1326                         return;
1327                 }
1328
1329                 $context = $this->getContext();
1330                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1331
1332                 # Cascade unhide param in links for easy deletion browsing
1333                 $extraParams = array();
1334                 if ( $unhide ) {
1335                         $extraParams['unhide'] = 1;
1336                 }
1337
1338                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1339                         $revision = $this->mRevision;
1340                 } else {
1341                         $revision = Revision::newFromId( $oldid );
1342                 }
1343
1344                 $timestamp = $revision->getTimestamp();
1345
1346                 $current = ( $oldid == $this->mPage->getLatest() );
1347                 $language = $context->getLanguage();
1348                 $user = $context->getUser();
1349
1350                 $td = $language->userTimeAndDate( $timestamp, $user );
1351                 $tddate = $language->userDate( $timestamp, $user );
1352                 $tdtime = $language->userTime( $timestamp, $user );
1353
1354                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1355                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1356
1357                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1358                         ? 'revision-info-current'
1359                         : 'revision-info';
1360
1361                 $outputPage = $context->getOutput();
1362                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" .
1363                         $context->msg( $infomsg, $td )
1364                                 ->rawParams( $userlinks )
1365                                 ->params( $revision->getID(), $tddate, $tdtime, $revision->getUserText() )
1366                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1367                                 ->parse() .
1368                         "</div>"
1369                 );
1370
1371                 $lnk = $current
1372                         ? $context->msg( 'currentrevisionlink' )->escaped()
1373                         : Linker::linkKnown(
1374                                 $this->getTitle(),
1375                                 $context->msg( 'currentrevisionlink' )->escaped(),
1376                                 array(),
1377                                 $extraParams
1378                         );
1379                 $curdiff = $current
1380                         ? $context->msg( 'diff' )->escaped()
1381                         : Linker::linkKnown(
1382                                 $this->getTitle(),
1383                                 $context->msg( 'diff' )->escaped(),
1384                                 array(),
1385                                 array(
1386                                         'diff' => 'cur',
1387                                         'oldid' => $oldid
1388                                 ) + $extraParams
1389                         );
1390                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1391                 $prevlink = $prev
1392                         ? Linker::linkKnown(
1393                                 $this->getTitle(),
1394                                 $context->msg( 'previousrevision' )->escaped(),
1395                                 array(),
1396                                 array(
1397                                         'direction' => 'prev',
1398                                         'oldid' => $oldid
1399                                 ) + $extraParams
1400                         )
1401                         : $context->msg( 'previousrevision' )->escaped();
1402                 $prevdiff = $prev
1403                         ? Linker::linkKnown(
1404                                 $this->getTitle(),
1405                                 $context->msg( 'diff' )->escaped(),
1406                                 array(),
1407                                 array(
1408                                         'diff' => 'prev',
1409                                         'oldid' => $oldid
1410                                 ) + $extraParams
1411                         )
1412                         : $context->msg( 'diff' )->escaped();
1413                 $nextlink = $current
1414                         ? $context->msg( 'nextrevision' )->escaped()
1415                         : Linker::linkKnown(
1416                                 $this->getTitle(),
1417                                 $context->msg( 'nextrevision' )->escaped(),
1418                                 array(),
1419                                 array(
1420                                         'direction' => 'next',
1421                                         'oldid' => $oldid
1422                                 ) + $extraParams
1423                         );
1424                 $nextdiff = $current
1425                         ? $context->msg( 'diff' )->escaped()
1426                         : Linker::linkKnown(
1427                                 $this->getTitle(),
1428                                 $context->msg( 'diff' )->escaped(),
1429                                 array(),
1430                                 array(
1431                                         'diff' => 'next',
1432                                         'oldid' => $oldid
1433                                 ) + $extraParams
1434                         );
1435
1436                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1437                 if ( $cdel !== '' ) {
1438                         $cdel .= ' ';
1439                 }
1440
1441                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1442                         $context->msg( 'revision-nav' )->rawParams(
1443                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1444                         )->escaped() . "</div>" );
1445         }
1446
1447         /**
1448          * Return the HTML for the top of a redirect page
1449          *
1450          * Chances are you should just be using the ParserOutput from
1451          * WikitextContent::getParserOutput instead of calling this for redirects.
1452          *
1453          * @param Title|array $target Destination(s) to redirect
1454          * @param bool $appendSubtitle [optional]
1455          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1456          * @return string Containing HTML with redirect link
1457          */
1458         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1459                 $lang = $this->getTitle()->getPageLanguage();
1460                 $out = $this->getContext()->getOutput();
1461                 if ( $appendSubtitle ) {
1462                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1463                 }
1464                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1465                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1466         }
1467
1468         /**
1469          * Return the HTML for the top of a redirect page
1470          *
1471          * Chances are you should just be using the ParserOutput from
1472          * WikitextContent::getParserOutput instead of calling this for redirects.
1473          *
1474          * @since 1.23
1475          * @param Language $lang
1476          * @param Title|array $target Destination(s) to redirect
1477          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1478          * @return string Containing HTML with redirect link
1479          */
1480         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1481                 if ( !is_array( $target ) ) {
1482                         $target = array( $target );
1483                 }
1484
1485                 $html = '<ul class="redirectText">';
1486                 /** @var Title $title */
1487                 foreach ( $target as $title ) {
1488                         $html .= '<li>' . Linker::link(
1489                                 $title,
1490                                 htmlspecialchars( $title->getFullText() ),
1491                                 array(),
1492                                 // Automatically append redirect=no to each link, since most of them are
1493                                 // redirect pages themselves.
1494                                 array( 'redirect' => 'no' ),
1495                                 ( $forceKnown ? array( 'known', 'noclasses' ) : array() )
1496                         ) . '</li>';
1497                 }
1498                 $html .= '</ul>';
1499
1500                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1501
1502                 return '<div class="redirectMsg">' .
1503                         '<p>' . $redirectToText . '</p>' .
1504                         $html .
1505                         '</div>';
1506         }
1507
1508         /**
1509          * Handle action=render
1510          */
1511         public function render() {
1512                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1513                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1514                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1515                 $this->view();
1516         }
1517
1518         /**
1519          * action=protect handler
1520          */
1521         public function protect() {
1522                 $form = new ProtectionForm( $this );
1523                 $form->execute();
1524         }
1525
1526         /**
1527          * action=unprotect handler (alias)
1528          */
1529         public function unprotect() {
1530                 $this->protect();
1531         }
1532
1533         /**
1534          * UI entry point for page deletion
1535          */
1536         public function delete() {
1537                 # This code desperately needs to be totally rewritten
1538
1539                 $title = $this->getTitle();
1540                 $context = $this->getContext();
1541                 $user = $context->getUser();
1542
1543                 # Check permissions
1544                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1545                 if ( count( $permissionErrors ) ) {
1546                         throw new PermissionsError( 'delete', $permissionErrors );
1547                 }
1548
1549                 # Read-only check...
1550                 if ( wfReadOnly() ) {
1551                         throw new ReadOnlyError;
1552                 }
1553
1554                 # Better double-check that it hasn't been deleted yet!
1555                 $this->mPage->loadPageData( 'fromdbmaster' );
1556                 if ( !$this->mPage->exists() ) {
1557                         $deleteLogPage = new LogPage( 'delete' );
1558                         $outputPage = $context->getOutput();
1559                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1560                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1561                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1562                                 );
1563                         $outputPage->addHTML(
1564                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1565                         );
1566                         LogEventsList::showLogExtract(
1567                                 $outputPage,
1568                                 'delete',
1569                                 $title
1570                         );
1571
1572                         return;
1573                 }
1574
1575                 $request = $context->getRequest();
1576                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1577                 $deleteReason = $request->getText( 'wpReason' );
1578
1579                 if ( $deleteReasonList == 'other' ) {
1580                         $reason = $deleteReason;
1581                 } elseif ( $deleteReason != '' ) {
1582                         // Entry from drop down menu + additional comment
1583                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1584                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1585                 } else {
1586                         $reason = $deleteReasonList;
1587                 }
1588
1589                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1590                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1591                 ) {
1592                         # Flag to hide all contents of the archived revisions
1593                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1594
1595                         $this->doDelete( $reason, $suppress );
1596
1597                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1598
1599                         return;
1600                 }
1601
1602                 // Generate deletion reason
1603                 $hasHistory = false;
1604                 if ( !$reason ) {
1605                         try {
1606                                 $reason = $this->generateReason( $hasHistory );
1607                         } catch ( Exception $e ) {
1608                                 # if a page is horribly broken, we still want to be able to
1609                                 # delete it. So be lenient about errors here.
1610                                 wfDebug( "Error while building auto delete summary: $e" );
1611                                 $reason = '';
1612                         }
1613                 }
1614
1615                 // If the page has a history, insert a warning
1616                 if ( $hasHistory ) {
1617                         $title = $this->getTitle();
1618
1619                         // The following can use the real revision count as this is only being shown for users
1620                         // that can delete this page.
1621                         // This, as a side-effect, also makes sure that the following query isn't being run for
1622                         // pages with a larger history, unless the user has the 'bigdelete' right
1623                         // (and is about to delete this page).
1624                         $dbr = wfGetDB( DB_SLAVE );
1625                         $revisions = $edits = (int)$dbr->selectField(
1626                                 'revision',
1627                                 'COUNT(rev_page)',
1628                                 array( 'rev_page' => $title->getArticleID() ),
1629                                 __METHOD__
1630                         );
1631
1632                         // @todo FIXME: i18n issue/patchwork message
1633                         $context->getOutput()->addHTML(
1634                                 '<strong class="mw-delete-warning-revisions">' .
1635                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1636                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1637                                         $context->msg( 'history' )->escaped(),
1638                                         array(),
1639                                         array( 'action' => 'history' ) ) .
1640                                 '</strong>'
1641                         );
1642
1643                         if ( $title->isBigDeletion() ) {
1644                                 global $wgDeleteRevisionsLimit;
1645                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1646                                         array(
1647                                                 'delete-warning-toobig',
1648                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1649                                         )
1650                                 );
1651                         }
1652                 }
1653
1654                 $this->confirmDelete( $reason );
1655         }
1656
1657         /**
1658          * Output deletion confirmation dialog
1659          * @todo FIXME: Move to another file?
1660          * @param string $reason Prefilled reason
1661          */
1662         public function confirmDelete( $reason ) {
1663                 wfDebug( "Article::confirmDelete\n" );
1664
1665                 $title = $this->getTitle();
1666                 $ctx = $this->getContext();
1667                 $outputPage = $ctx->getOutput();
1668                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1669                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1670                 $outputPage->addBacklinkSubtitle( $title );
1671                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1672                 $backlinkCache = $title->getBacklinkCache();
1673                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1674                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1675                                 'deleting-backlinks-warning' );
1676                 }
1677                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1678
1679                 Hooks::run( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1680
1681                 $user = $this->getContext()->getUser();
1682
1683                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1684                         $suppress = Html::openElement( 'div', array( 'id' => 'wpDeleteSuppressRow' ) ) .
1685                                 "<strong>" .
1686                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1687                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1688                                         "</strong>" .
1689                                 Html::closeElement( 'div' );
1690                 } else {
1691                         $suppress = '';
1692                 }
1693                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1694
1695                 $form = Html::openElement( 'form', array( 'method' => 'post',
1696                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1697                         Html::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1698                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1699                         Html::openElement( 'div', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1700                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonListRow' ) ) .
1701                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1702                         '&nbsp;' .
1703                         Xml::listDropDown(
1704                                 'wpDeleteReasonList',
1705                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1706                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1707                                 '',
1708                                 'wpReasonDropDown',
1709                                 1
1710                         ) .
1711                         Html::closeElement( 'div' ) .
1712                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonRow' ) ) .
1713                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1714                         '&nbsp;' .
1715                         Html::input( 'wpReason', $reason, 'text', array(
1716                                 'size' => '60',
1717                                 'maxlength' => '255',
1718                                 'tabindex' => '2',
1719                                 'id' => 'wpReason',
1720                                 'class' => 'mw-ui-input-inline',
1721                                 'autofocus'
1722                         ) ) .
1723                         Html::closeElement( 'div' );
1724
1725                 # Disallow watching if user is not logged in
1726                 if ( $user->isLoggedIn() ) {
1727                         $form .=
1728                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1729                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) );
1730                 }
1731
1732                 $form .=
1733                                 Html::openElement( 'div' ) .
1734                                 $suppress .
1735                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1736                                                 array(
1737                                                         'name' => 'wpConfirmB',
1738                                                         'id' => 'wpConfirmB',
1739                                                         'tabindex' => '5',
1740                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1741                                                 )
1742                                         ) .
1743                                 Html::closeElement( 'div' ) .
1744                         Html::closeElement( 'div' ) .
1745                         Xml::closeElement( 'fieldset' ) .
1746                         Html::hidden(
1747                                 'wpEditToken',
1748                                 $user->getEditToken( array( 'delete', $title->getPrefixedText() ) )
1749                         ) .
1750                         Xml::closeElement( 'form' );
1751
1752                         if ( $user->isAllowed( 'editinterface' ) ) {
1753                                 $dropdownTitle = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1754                                 $link = Linker::link(
1755                                         $dropdownTitle,
1756                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1757                                         array(),
1758                                         array( 'action' => 'edit' )
1759                                 );
1760                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1761                         }
1762
1763                 $outputPage->addHTML( $form );
1764
1765                 $deleteLogPage = new LogPage( 'delete' );
1766                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1767                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1768         }
1769
1770         /**
1771          * Perform a deletion and output success or failure messages
1772          * @param string $reason
1773          * @param bool $suppress
1774          */
1775         public function doDelete( $reason, $suppress = false ) {
1776                 $error = '';
1777                 $outputPage = $this->getContext()->getOutput();
1778                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1779
1780                 if ( $status->isGood() ) {
1781                         $deleted = $this->getTitle()->getPrefixedText();
1782
1783                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1784                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1785
1786                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1787
1788                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1789
1790                         Hooks::run( 'ArticleDeleteAfterSuccess', array( $this->getTitle(), $outputPage ) );
1791
1792                         $outputPage->returnToMain( false );
1793                 } else {
1794                         $outputPage->setPageTitle(
1795                                 wfMessage( 'cannotdelete-title',
1796                                         $this->getTitle()->getPrefixedText() )
1797                         );
1798
1799                         if ( $error == '' ) {
1800                                 $outputPage->addWikiText(
1801                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1802                                 );
1803                                 $deleteLogPage = new LogPage( 'delete' );
1804                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1805
1806                                 LogEventsList::showLogExtract(
1807                                         $outputPage,
1808                                         'delete',
1809                                         $this->getTitle()
1810                                 );
1811                         } else {
1812                                 $outputPage->addHTML( $error );
1813                         }
1814                 }
1815         }
1816
1817         /* Caching functions */
1818
1819         /**
1820          * checkLastModified returns true if it has taken care of all
1821          * output to the client that is necessary for this request.
1822          * (that is, it has sent a cached version of the page)
1823          *
1824          * @return bool True if cached version send, false otherwise
1825          */
1826         protected function tryFileCache() {
1827                 static $called = false;
1828
1829                 if ( $called ) {
1830                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1831                         return false;
1832                 }
1833
1834                 $called = true;
1835                 if ( $this->isFileCacheable() ) {
1836                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1837                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1838                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1839                                 $cache->loadFromFileCache( $this->getContext() );
1840                                 return true;
1841                         } else {
1842                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1843                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1844                         }
1845                 } else {
1846                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1847                 }
1848
1849                 return false;
1850         }
1851
1852         /**
1853          * Check if the page can be cached
1854          * @return bool
1855          */
1856         public function isFileCacheable() {
1857                 $cacheable = false;
1858
1859                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1860                         $cacheable = $this->mPage->getID()
1861                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1862                         // Extension may have reason to disable file caching on some pages.
1863                         if ( $cacheable ) {
1864                                 $cacheable = Hooks::run( 'IsFileCacheable', array( &$this ) );
1865                         }
1866                 }
1867
1868                 return $cacheable;
1869         }
1870
1871         /**#@-*/
1872
1873         /**
1874          * Lightweight method to get the parser output for a page, checking the parser cache
1875          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1876          * consider, so it's not appropriate to use there.
1877          *
1878          * @since 1.16 (r52326) for LiquidThreads
1879          *
1880          * @param int|null $oldid Revision ID or null
1881          * @param User $user The relevant user
1882          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1883          */
1884         public function getParserOutput( $oldid = null, User $user = null ) {
1885                 //XXX: bypasses mParserOptions and thus setParserOptions()
1886
1887                 if ( $user === null ) {
1888                         $parserOptions = $this->getParserOptions();
1889                 } else {
1890                         $parserOptions = $this->mPage->makeParserOptions( $user );
1891                 }
1892
1893                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1894         }
1895
1896         /**
1897          * Override the ParserOptions used to render the primary article wikitext.
1898          *
1899          * @param ParserOptions $options
1900          * @throws MWException If the parser options where already initialized.
1901          */
1902         public function setParserOptions( ParserOptions $options ) {
1903                 if ( $this->mParserOptions ) {
1904                         throw new MWException( "can't change parser options after they have already been set" );
1905                 }
1906
1907                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1908                 $this->mParserOptions = clone $options;
1909         }
1910
1911         /**
1912          * Get parser options suitable for rendering the primary article wikitext
1913          * @return ParserOptions
1914          */
1915         public function getParserOptions() {
1916                 if ( !$this->mParserOptions ) {
1917                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1918                 }
1919                 // Clone to allow modifications of the return value without affecting cache
1920                 return clone $this->mParserOptions;
1921         }
1922
1923         /**
1924          * Sets the context this Article is executed in
1925          *
1926          * @param IContextSource $context
1927          * @since 1.18
1928          */
1929         public function setContext( $context ) {
1930                 $this->mContext = $context;
1931         }
1932
1933         /**
1934          * Gets the context this Article is executed in
1935          *
1936          * @return IContextSource
1937          * @since 1.18
1938          */
1939         public function getContext() {
1940                 if ( $this->mContext instanceof IContextSource ) {
1941                         return $this->mContext;
1942                 } else {
1943                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1944                                 "Return RequestContext::getMain(); for sanity\n" );
1945                         return RequestContext::getMain();
1946                 }
1947         }
1948
1949         /**
1950          * Use PHP's magic __get handler to handle accessing of
1951          * raw WikiPage fields for backwards compatibility.
1952          *
1953          * @param string $fname Field name
1954          * @return mixed
1955          */
1956         public function __get( $fname ) {
1957                 if ( property_exists( $this->mPage, $fname ) ) {
1958                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1959                         return $this->mPage->$fname;
1960                 }
1961                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1962         }
1963
1964         /**
1965          * Use PHP's magic __set handler to handle setting of
1966          * raw WikiPage fields for backwards compatibility.
1967          *
1968          * @param string $fname Field name
1969          * @param mixed $fvalue New value
1970          */
1971         public function __set( $fname, $fvalue ) {
1972                 if ( property_exists( $this->mPage, $fname ) ) {
1973                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1974                         $this->mPage->$fname = $fvalue;
1975                 // Note: extensions may want to toss on new fields
1976                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1977                         $this->mPage->$fname = $fvalue;
1978                 } else {
1979                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1980                 }
1981         }
1982
1983         /**
1984          * Use PHP's magic __call handler to transform instance calls to
1985          * WikiPage functions for backwards compatibility.
1986          *
1987          * @param string $fname Name of called method
1988          * @param array $args Arguments to the method
1989          * @return mixed
1990          */
1991         public function __call( $fname, $args ) {
1992                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1993                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1994                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1995                 }
1996                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1997         }
1998
1999         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2000
2001         /**
2002          * @param array $limit
2003          * @param array $expiry
2004          * @param bool $cascade
2005          * @param string $reason
2006          * @param User $user
2007          * @return Status
2008          */
2009         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2010                 $reason, User $user
2011         ) {
2012                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2013         }
2014
2015         /**
2016          * @param array $limit
2017          * @param string $reason
2018          * @param int $cascade
2019          * @param array $expiry
2020          * @return bool
2021          */
2022         public function updateRestrictions( $limit = array(), $reason = '',
2023                 &$cascade = 0, $expiry = array()
2024         ) {
2025                 return $this->mPage->doUpdateRestrictions(
2026                         $limit,
2027                         $expiry,
2028                         $cascade,
2029                         $reason,
2030                         $this->getContext()->getUser()
2031                 );
2032         }
2033
2034         /**
2035          * @param string $reason
2036          * @param bool $suppress
2037          * @param int $id
2038          * @param bool $commit
2039          * @param string $error
2040          * @return bool
2041          */
2042         public function doDeleteArticle( $reason, $suppress = false, $id = 0,
2043                 $commit = true, &$error = ''
2044         ) {
2045                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2046         }
2047
2048         /**
2049          * @param string $fromP
2050          * @param string $summary
2051          * @param string $token
2052          * @param bool $bot
2053          * @param array $resultDetails
2054          * @param User|null $user
2055          * @return array
2056          */
2057         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2058                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2059                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2060         }
2061
2062         /**
2063          * @param string $fromP
2064          * @param string $summary
2065          * @param bool $bot
2066          * @param array $resultDetails
2067          * @param User|null $guser
2068          * @return array
2069          */
2070         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2071                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2072                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2073         }
2074
2075         /**
2076          * @param bool $hasHistory
2077          * @return mixed
2078          */
2079         public function generateReason( &$hasHistory ) {
2080                 $title = $this->mPage->getTitle();
2081                 $handler = ContentHandler::getForTitle( $title );
2082                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2083         }
2084
2085         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2086
2087         /**
2088          * @return array
2089          *
2090          * @deprecated since 1.24, use WikiPage::selectFields() instead
2091          */
2092         public static function selectFields() {
2093                 wfDeprecated( __METHOD__, '1.24' );
2094                 return WikiPage::selectFields();
2095         }
2096
2097         /**
2098          * @param Title $title
2099          *
2100          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2101          */
2102         public static function onArticleCreate( $title ) {
2103                 wfDeprecated( __METHOD__, '1.24' );
2104                 WikiPage::onArticleCreate( $title );
2105         }
2106
2107         /**
2108          * @param Title $title
2109          *
2110          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2111          */
2112         public static function onArticleDelete( $title ) {
2113                 wfDeprecated( __METHOD__, '1.24' );
2114                 WikiPage::onArticleDelete( $title );
2115         }
2116
2117         /**
2118          * @param Title $title
2119          *
2120          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2121          */
2122         public static function onArticleEdit( $title ) {
2123                 wfDeprecated( __METHOD__, '1.24' );
2124                 WikiPage::onArticleEdit( $title );
2125         }
2126
2127         /**
2128          * @param string $oldtext
2129          * @param string $newtext
2130          * @param int $flags
2131          * @return string
2132          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2133          */
2134         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2135                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2136         }
2137         // ******
2138 }