includes/Article.php

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