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                                                 $this->mPage->doViewUpdates( $user );
 615                                                 wfProfileOut( __METHOD__ );
 616                                                 return;
 617                                         }
 618
 619                                         # Try the parser cache
 620                                         if ( $useParserCache ) {
 621                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 622
 623                                                 if ( $this->mParserOutput !== false ) {
 624                                                         if ( $oldid ) {
 625                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 626                                                                 $this->setOldSubtitle( $oldid );
 627                                                         } else {
 628                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 629                                                         }
 630                                                         $outputPage->addParserOutput( $this->mParserOutput );
 631                                                         # Ensure that UI elements requiring revision ID have
 632                                                         # the correct version information.
 633                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 634                                                         # Preload timestamp to avoid a DB hit
 635                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 636                                                         if ( $cachedTimestamp !== null ) {
 637                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 638                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 639                                                         }
 640                                                         $outputDone = true;
 641                                                 }
 642                                         }
 643                                         break;
 644                                 case 3:
 645                                         # This will set $this->mRevision if needed
 646                                         $this->fetchContentObject();
 647
 648                                         # Are we looking at an old revision
 649                                         if ( $oldid && $this->mRevision ) {
 650                                                 $this->setOldSubtitle( $oldid );
 651
 652                                                 if ( !$this->showDeletedRevisionHeader() ) {
 653                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 654                                                         wfProfileOut( __METHOD__ );
 655                                                         return;
 656                                                 }
 657                                         }
 658
 659                                         # Ensure that UI elements requiring revision ID have
 660                                         # the correct version information.
 661                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 662                                         # Preload timestamp to avoid a DB hit
 663                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 664
 665                                         # Pages containing custom CSS or JavaScript get special treatment
 666                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 667                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 668                                                 $this->showCssOrJsPage();
 669                                                 $outputDone = true;
 670                                         } elseif ( !wfRunHooks( 'ArticleContentViewCustom',
 671                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 672
 673                                                 # Allow extensions do their own custom view for certain pages
 674                                                 $outputDone = true;
 675                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 676                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 677
 678                                                 # Allow extensions do their own custom view for certain pages
 679                                                 $outputDone = true;
 680                                         }
 681                                         break;
 682                                 case 4:
 683                                         # Run the parse, protected by a pool counter
 684                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 685
 686                                         $content = $this->getContentObject();
 687                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 688                                                 $this->getRevIdFetched(), $useParserCache, $content );
 689
 690                                         if ( !$poolArticleView->execute() ) {
 691                                                 $error = $poolArticleView->getError();
 692                                                 if ( $error ) {
 693                                                         $outputPage->clearHTML(); // for release() errors
 694                                                         $outputPage->enableClientCache( false );
 695                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 696
 697                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 698                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 699                                                 }
 700                                                 # Connection or timeout error
 701                                                 wfProfileOut( __METHOD__ );
 702                                                 return;
 703                                         }
 704
 705                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 706                                         $outputPage->addParserOutput( $this->mParserOutput );
 707                                         if ( $content->getRedirectTarget() ) {
 708                                                 $outputPage->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
 709                                         }
 710
 711                                         # Don't cache a dirty ParserOutput object
 712                                         if ( $poolArticleView->getIsDirty() ) {
 713                                                 $outputPage->setSquidMaxage( 0 );
 714                                                 $outputPage->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
 715                                         }
 716
 717                                         $outputDone = true;
 718                                         break;
 719                                 # Should be unreachable, but just in case...
 720                                 default:
 721                                         break 2;
 722                         }
 723                 }
 724
 725                 # Get the ParserOutput actually *displayed* here.
 726                 # Note that $this->mParserOutput is the *current* version output.
 727                 $pOutput = ( $outputDone instanceof ParserOutput )
 728                         ? $outputDone // object fetched by hook
 729                         : $this->mParserOutput;
 730
 731                 # Adjust title for main page & pages with displaytitle
 732                 if ( $pOutput ) {
 733                         $this->adjustDisplayTitle( $pOutput );
 734                 }
 735
 736                 # For the main page, overwrite the <title> element with the con-
 737                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 738                 # that's not empty).
 739                 # This message always exists because it is in the i18n files
 740                 if ( $this->getTitle()->isMainPage() ) {
 741                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 742                         if ( !$msg->isDisabled() ) {
 743                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 744                         }
 745                 }
 746
 747                 # Check for any __NOINDEX__ tags on the page using $pOutput
 748                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 749                 $outputPage->setIndexPolicy( $policy['index'] );
 750                 $outputPage->setFollowPolicy( $policy['follow'] );
 751
 752                 $this->showViewFooter();
 753                 $this->mPage->doViewUpdates( $user, $oldid );
 754
 755                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 756
 757                 wfProfileOut( __METHOD__ );
 758         }
 759
 760         /**
 761          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 762          * @param $pOutput ParserOutput
 763          */
 764         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 765                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 766                 $titleText = $pOutput->getTitleText();
 767                 if ( strval( $titleText ) !== '' ) {
 768                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 769                 }
 770         }
 771
 772         /**
 773          * Show a diff page according to current request variables. For use within
 774          * Article::view() only, other callers should use the DifferenceEngine class.
 775          *
 776          * @todo Make protected
 777          */
 778         public function showDiffPage() {
 779                 $request = $this->getContext()->getRequest();
 780                 $user = $this->getContext()->getUser();
 781                 $diff = $request->getVal( 'diff' );
 782                 $rcid = $request->getVal( 'rcid' );
 783                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 784                 $purge = $request->getVal( 'action' ) == 'purge';
 785                 $unhide = $request->getInt( 'unhide' ) == 1;
 786                 $oldid = $this->getOldID();
 787
 788                 $rev = $this->getRevisionFetched();
 789
 790                 if ( !$rev ) {
 791                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 792                         $this->getContext()->getOutput()->addWikiMsg( 'difference-missing-revision', $oldid, 1 );
 793                         return;
 794                 }
 795
 796                 $contentHandler = $rev->getContentHandler();
 797                 $de = $contentHandler->createDifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 798
 799                 // DifferenceEngine directly fetched the revision:
 800                 $this->mRevIdFetched = $de->mNewid;
 801                 $de->showDiffPage( $diffOnly );
 802
 803                 // Run view updates for the newer revision being diffed (and shown below the diff if not $diffOnly)
 804                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 805                 // New can be false, convert it to 0 - this conveniently means the latest revision
 806                 $this->mPage->doViewUpdates( $user, (int)$new );
 807         }
 808
 809         /**
 810          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 811          * Article::view() only.
 812          *
 813          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 814          * page views.
 815          *
 816          * @param bool $showCacheHint whether to show a message telling the user to clear the browser cache (default: true).
 817          */
 818         protected function showCssOrJsPage( $showCacheHint = true ) {
 819                 $outputPage = $this->getContext()->getOutput();
 820
 821                 if ( $showCacheHint ) {
 822                         $dir = $this->getContext()->getLanguage()->getDir();
 823                         $lang = $this->getContext()->getLanguage()->getCode();
 824
 825                         $outputPage->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 826                                 'clearyourcache' );
 827                 }
 828
 829                 $this->fetchContentObject();
 830
 831                 if ( $this->mContentObject ) {
 832                         // Give hooks a chance to customise the output
 833                         if ( ContentHandler::runLegacyHooks( 'ShowRawCssJs', array( $this->mContentObject, $this->getTitle(), $outputPage ) ) ) {
 834                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 835                                 $outputPage->addHTML( $po->getText() );
 836                         }
 837                 }
 838         }
 839
 840         /**
 841          * Get the robot policy to be used for the current view
 842          * @param string $action the action= GET parameter
 843          * @param $pOutput ParserOutput|null
 844          * @return Array the policy that should be set
 845          * TODO: actions other than 'view'
 846          */
 847         public function getRobotPolicy( $action, $pOutput = null ) {
 848                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 849
 850                 $ns = $this->getTitle()->getNamespace();
 851
 852                 # Don't index user and user talk pages for blocked users (bug 11443)
 853                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 854                         $specificTarget = null;
 855                         $vagueTarget = null;
 856                         $titleText = $this->getTitle()->getText();
 857                         if ( IP::isValid( $titleText ) ) {
 858                                 $vagueTarget = $titleText;
 859                         } else {
 860                                 $specificTarget = $titleText;
 861                         }
 862                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 863                                 return array(
 864                                         'index' => 'noindex',
 865                                         'follow' => 'nofollow'
 866                                 );
 867                         }
 868                 }
 869
 870                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 871                         # Non-articles (special pages etc), and old revisions
 872                         return array(
 873                                 'index' => 'noindex',
 874                                 'follow' => 'nofollow'
 875                         );
 876                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 877                         # Discourage indexing of printable versions, but encourage following
 878                         return array(
 879                                 'index' => 'noindex',
 880                                 'follow' => 'follow'
 881                         );
 882                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 883                         # For ?curid=x urls, disallow indexing
 884                         return array(
 885                                 'index' => 'noindex',
 886                                 'follow' => 'follow'
 887                         );
 888                 }
 889
 890                 # Otherwise, construct the policy based on the various config variables.
 891                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 892
 893                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 894                         # Honour customised robot policies for this namespace
 895                         $policy = array_merge(
 896                                 $policy,
 897                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 898                         );
 899                 }
 900                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 901                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 902                         # a final sanity check that we have really got the parser output.
 903                         $policy = array_merge(
 904                                 $policy,
 905                                 array( 'index' => $pOutput->getIndexPolicy() )
 906                         );
 907                 }
 908
 909                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 910                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 911                         $policy = array_merge(
 912                                 $policy,
 913                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 914                         );
 915                 }
 916
 917                 return $policy;
 918         }
 919
 920         /**
 921          * Converts a String robot policy into an associative array, to allow
 922          * merging of several policies using array_merge().
 923          * @param $policy Mixed, returns empty array on null/false/'', transparent
 924          *            to already-converted arrays, converts String.
 925          * @return Array: 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 926          */
 927         public static function formatRobotPolicy( $policy ) {
 928                 if ( is_array( $policy ) ) {
 929                         return $policy;
 930                 } elseif ( !$policy ) {
 931                         return array();
 932                 }
 933
 934                 $policy = explode( ',', $policy );
 935                 $policy = array_map( 'trim', $policy );
 936
 937                 $arr = array();
 938                 foreach ( $policy as $var ) {
 939                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 940                                 $arr['index'] = $var;
 941                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 942                                 $arr['follow'] = $var;
 943                         }
 944                 }
 945
 946                 return $arr;
 947         }
 948
 949         /**
 950          * If this request is a redirect view, send "redirected from" subtitle to
 951          * the output. Returns true if the header was needed, false if this is not
 952          * a redirect view. Handles both local and remote redirects.
 953          *
 954          * @return boolean
 955          */
 956         public function showRedirectedFromHeader() {
 957                 global $wgRedirectSources;
 958                 $outputPage = $this->getContext()->getOutput();
 959
 960                 $rdfrom = $this->getContext()->getRequest()->getVal( 'rdfrom' );
 961
 962                 if ( isset( $this->mRedirectedFrom ) ) {
 963                         // This is an internally redirected page view.
 964                         // We'll need a backlink to the source page for navigation.
 965                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 966                                 $redir = Linker::linkKnown(
 967                                         $this->mRedirectedFrom,
 968                                         null,
 969                                         array(),
 970                                         array( 'redirect' => 'no' )
 971                                 );
 972
 973                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 974
 975                                 // Set the fragment if one was specified in the redirect
 976                                 if ( $this->getTitle()->hasFragment() ) {
 977                                         $outputPage->addJsConfigVars( 'wgRedirectToFragment', $this->getTitle()->getFragmentForURL() );
 978                                         $outputPage->addModules( 'mediawiki.action.view.redirectToFragment' );
 979                                 }
 980
 981                                 // Add a <link rel="canonical"> tag
 982                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
 983
 984                                 // Tell the output object that the user arrived at this article through a redirect
 985                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 986
 987                                 return true;
 988                         }
 989                 } elseif ( $rdfrom ) {
 990                         // This is an externally redirected view, from some other wiki.
 991                         // If it was reported from a trusted site, supply a backlink.
 992                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 993                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 994                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 995
 996                                 return true;
 997                         }
 998                 }
 999
1000                 return false;
1001         }
1002
1003         /**
1004          * Show a header specific to the namespace currently being viewed, like
1005          * [[MediaWiki:Talkpagetext]]. For Article::view().
1006          */
1007         public function showNamespaceHeader() {
1008                 if ( $this->getTitle()->isTalkPage() ) {
1009                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1010                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1011                         }
1012                 }
1013         }
1014
1015         /**
1016          * Show the footer section of an ordinary page view
1017          */
1018         public function showViewFooter() {
1019                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1020                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
1021                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1022                 }
1023
1024                 // Show a footer allowing the user to patrol the shown revision or page if possible
1025                 $patrolFooterShown = $this->showPatrolFooter();
1026
1027                 wfRunHooks( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1028
1029         }
1030
1031         /**
1032          * If patrol is possible, output a patrol UI box. This is called from the
1033          * footer section of ordinary page views. If patrol is not possible or not
1034          * desired, does nothing.
1035          * Side effect: When the patrol link is build, this method will call
1036          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1037          *
1038          * @return bool
1039          */
1040         public function showPatrolFooter() {
1041                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1042
1043                 $outputPage = $this->getContext()->getOutput();
1044                 $user = $this->getContext()->getUser();
1045                 $cache = wfGetMainCache();
1046                 $rc = false;
1047
1048                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user ) || !( $wgUseRCPatrol || $wgUseNPPatrol ) ) {
1049                         // Patrolling is disabled or the user isn't allowed to
1050                         return false;
1051                 }
1052
1053                 wfProfileIn( __METHOD__ );
1054
1055                 // New page patrol: Get the timestamp of the oldest revison which
1056                 // the revision table holds for the given page. Then we look
1057                 // whether it's within the RC lifespan and if it is, we try
1058                 // to get the recentchanges row belonging to that entry
1059                 // (with rc_new = 1).
1060
1061                 // Check for cached results
1062                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1063                         wfProfileOut( __METHOD__ );
1064                         return false;
1065                 }
1066
1067                 if ( $this->mRevision && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 ) ) {
1068                         // The current revision is already older than what could be in the RC table
1069                         // 6h tolerance because the RC might not be cleaned out regularly
1070                         wfProfileOut( __METHOD__ );
1071                         return false;
1072                 }
1073
1074                 $dbr = wfGetDB( DB_SLAVE );
1075                 $oldestRevisionTimestamp = $dbr->selectField(
1076                         'revision',
1077                         'MIN( rev_timestamp )',
1078                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1079                         __METHOD__
1080                 );
1081
1082                 if ( $oldestRevisionTimestamp && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 ) ) {
1083                         // 6h tolerance because the RC might not be cleaned out regularly
1084                         $rc = RecentChange::newFromConds(
1085                                 array(
1086                                         'rc_new' => 1,
1087                                         'rc_timestamp' => $oldestRevisionTimestamp,
1088                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1089                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1090                                         'rc_patrolled' => 0
1091                                 ),
1092                                 __METHOD__,
1093                                 array( 'USE INDEX' => 'new_name_timestamp' )
1094                         );
1095                 }
1096
1097                 if ( !$rc ) {
1098                         // No RC entry around
1099
1100                         // Cache the information we gathered above in case we can't patrol
1101                         // Don't cache in case we can patrol as this could change
1102                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1103
1104                         wfProfileOut( __METHOD__ );
1105                         return false;
1106                 }
1107
1108                 if ( $rc->getPerformer()->getName() == $user->getName() ) {
1109                         // Don't show a patrol link for own creations. If the user could
1110                         // patrol them, they already would be patrolled
1111                         wfProfileOut( __METHOD__ );
1112                         return false;
1113                 }
1114
1115                 $rcid = $rc->getAttribute( 'rc_id' );
1116
1117                 $token = $user->getEditToken( $rcid );
1118
1119                 $outputPage->preventClickjacking();
1120                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1121                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1122                 }
1123
1124                 $link = Linker::linkKnown(
1125                         $this->getTitle(),
1126                         wfMessage( 'markaspatrolledtext' )->escaped(),
1127                         array(),
1128                         array(
1129                                 'action' => 'markpatrolled',
1130                                 'rcid' => $rcid,
1131                                 'token' => $token,
1132                         )
1133                 );
1134
1135                 $outputPage->addHTML(
1136                         "<div class='patrollink'>" .
1137                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1138                         '</div>'
1139                 );
1140
1141                 wfProfileOut( __METHOD__ );
1142                 return true;
1143         }
1144
1145         /**
1146          * Show the error text for a missing article. For articles in the MediaWiki
1147          * namespace, show the default message text. To be called from Article::view().
1148          */
1149         public function showMissingArticle() {
1150                 global $wgSend404Code;
1151                 $outputPage = $this->getContext()->getOutput();
1152                 // Whether the page is a root user page of an existing user (but not a subpage)
1153                 $validUserPage = false;
1154
1155                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1156                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
1157                         $parts = explode( '/', $this->getTitle()->getText() );
1158                         $rootPart = $parts[0];
1159                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1160                         $ip = User::isIP( $rootPart );
1161
1162                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1163                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1164                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1165                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1166                                 LogEventsList::showLogExtract(
1167                                         $outputPage,
1168                                         'block',
1169                                         $user->getUserPage(),
1170                                         '',
1171                                         array(
1172                                                 'lim' => 1,
1173                                                 'showIfEmpty' => false,
1174                                                 'msgKey' => array(
1175                                                         'blocked-notice-logextract',
1176                                                         $user->getName() # Support GENDER in notice
1177                                                 )
1178                                         )
1179                                 );
1180                                 $validUserPage = !$this->getTitle()->isSubpage();
1181                         } else {
1182                                 $validUserPage = !$this->getTitle()->isSubpage();
1183                         }
1184                 }
1185
1186                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1187
1188                 // Give extensions a chance to hide their (unrelated) log entries
1189                 $logTypes = array( 'delete', 'move' );
1190                 $conds = array( "log_action != 'revision'" );
1191                 wfRunHooks( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1192
1193                 # Show delete and move logs
1194                 LogEventsList::showLogExtract( $outputPage, $logTypes, $this->getTitle(), '',
1195                         array( 'lim' => 10,
1196                                 'conds' => $conds,
1197                                 'showIfEmpty' => false,
1198                                 'msgKey' => array( 'moveddeleted-notice' ) )
1199                 );
1200
1201                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1202                         // If there's no backing content, send a 404 Not Found
1203                         // for better machine handling of broken links.
1204                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1205                 }
1206
1207                 if ( $validUserPage ) {
1208                         // Also apply the robot policy for nonexisting user pages (as those aren't served as 404)
1209                         $policy = $this->getRobotPolicy( 'view' );
1210                         $outputPage->setIndexPolicy( $policy['index'] );
1211                         $outputPage->setFollowPolicy( $policy['follow'] );
1212                 }
1213
1214                 $hookResult = wfRunHooks( 'BeforeDisplayNoArticleText', array( $this ) );
1215
1216                 if ( ! $hookResult ) {
1217                         return;
1218                 }
1219
1220                 # Show error message
1221                 $oldid = $this->getOldID();
1222                 if ( $oldid ) {
1223                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1224                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
1225                         // Use the default message text
1226                         $text = $this->getTitle()->getDefaultMessageText();
1227                 } elseif ( $this->getTitle()->quickUserCan( 'create', $this->getContext()->getUser() )
1228                         && $this->getTitle()->quickUserCan( 'edit', $this->getContext()->getUser() )
1229                 ) {
1230                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1231                         $text = wfMessage( $message )->plain();
1232                 } else {
1233                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1234                 }
1235                 $text = "<div class='noarticletext'>\n$text\n</div>";
1236
1237                 $outputPage->addWikiText( $text );
1238         }
1239
1240         /**
1241          * If the revision requested for view is deleted, check permissions.
1242          * Send either an error message or a warning header to the output.
1243          *
1244          * @return boolean true if the view is allowed, false if not.
1245          */
1246         public function showDeletedRevisionHeader() {
1247                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1248                         // Not deleted
1249                         return true;
1250                 }
1251
1252                 $outputPage = $this->getContext()->getOutput();
1253                 $user = $this->getContext()->getUser();
1254                 // If the user is not allowed to see it...
1255                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1256                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1257                                 'rev-deleted-text-permission' );
1258
1259                         return false;
1260                 // If the user needs to confirm that they want to see it...
1261                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1262                         # Give explanation and add a link to view the revision...
1263                         $oldid = intval( $this->getOldID() );
1264                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1265                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1266                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1267                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1268                                 array( $msg, $link ) );
1269
1270                         return false;
1271                 // We are allowed to see...
1272                 } else {
1273                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1274                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1275                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1276
1277                         return true;
1278                 }
1279         }
1280
1281         /**
1282          * Generate the navigation links when browsing through an article revisions
1283          * It shows the information as:
1284          *   Revision as of \<date\>; view current revision
1285          *   \<- Previous version | Next Version -\>
1286          *
1287          * @param int $oldid revision ID of this article revision
1288          */
1289         public function setOldSubtitle( $oldid = 0 ) {
1290                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1291                         return;
1292                 }
1293
1294                 $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
1295
1296                 # Cascade unhide param in links for easy deletion browsing
1297                 $extraParams = array();
1298                 if ( $unhide ) {
1299                         $extraParams['unhide'] = 1;
1300                 }
1301
1302                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1303                         $revision = $this->mRevision;
1304                 } else {
1305                         $revision = Revision::newFromId( $oldid );
1306                 }
1307
1308                 $timestamp = $revision->getTimestamp();
1309
1310                 $current = ( $oldid == $this->mPage->getLatest() );
1311                 $language = $this->getContext()->getLanguage();
1312                 $user = $this->getContext()->getUser();
1313
1314                 $td = $language->userTimeAndDate( $timestamp, $user );
1315                 $tddate = $language->userDate( $timestamp, $user );
1316                 $tdtime = $language->userTime( $timestamp, $user );
1317
1318                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1319                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1320
1321                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1322                         ? 'revision-info-current'
1323                         : 'revision-info';
1324
1325                 $outputPage = $this->getContext()->getOutput();
1326                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1327                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1328                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1329
1330                 $lnk = $current
1331                         ? wfMessage( 'currentrevisionlink' )->escaped()
1332                         : Linker::linkKnown(
1333                                 $this->getTitle(),
1334                                 wfMessage( 'currentrevisionlink' )->escaped(),
1335                                 array(),
1336                                 $extraParams
1337                         );
1338                 $curdiff = $current
1339                         ? wfMessage( 'diff' )->escaped()
1340                         : Linker::linkKnown(
1341                                 $this->getTitle(),
1342                                 wfMessage( 'diff' )->escaped(),
1343                                 array(),
1344                                 array(
1345                                         'diff' => 'cur',
1346                                         'oldid' => $oldid
1347                                 ) + $extraParams
1348                         );
1349                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1350                 $prevlink = $prev
1351                         ? Linker::linkKnown(
1352                                 $this->getTitle(),
1353                                 wfMessage( 'previousrevision' )->escaped(),
1354                                 array(),
1355                                 array(
1356                                         'direction' => 'prev',
1357                                         'oldid' => $oldid
1358                                 ) + $extraParams
1359                         )
1360                         : wfMessage( 'previousrevision' )->escaped();
1361                 $prevdiff = $prev
1362                         ? Linker::linkKnown(
1363                                 $this->getTitle(),
1364                                 wfMessage( 'diff' )->escaped(),
1365                                 array(),
1366                                 array(
1367                                         'diff' => 'prev',
1368                                         'oldid' => $oldid
1369                                 ) + $extraParams
1370                         )
1371                         : wfMessage( 'diff' )->escaped();
1372                 $nextlink = $current
1373                         ? wfMessage( 'nextrevision' )->escaped()
1374                         : Linker::linkKnown(
1375                                 $this->getTitle(),
1376                                 wfMessage( 'nextrevision' )->escaped(),
1377                                 array(),
1378                                 array(
1379                                         'direction' => 'next',
1380                                         'oldid' => $oldid
1381                                 ) + $extraParams
1382                         );
1383                 $nextdiff = $current
1384                         ? wfMessage( 'diff' )->escaped()
1385                         : Linker::linkKnown(
1386                                 $this->getTitle(),
1387                                 wfMessage( 'diff' )->escaped(),
1388                                 array(),
1389                                 array(
1390                                         'diff' => 'next',
1391                                         'oldid' => $oldid
1392                                 ) + $extraParams
1393                         );
1394
1395                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1396                 if ( $cdel !== '' ) {
1397                         $cdel .= ' ';
1398                 }
1399
1400                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1401                         wfMessage( 'revision-nav' )->rawParams(
1402                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1403                         )->escaped() . "</div>" );
1404         }
1405
1406         /**
1407          * Return the HTML for the top of a redirect page
1408          *
1409          * Chances are you should just be using the ParserOutput from
1410          * WikitextContent::getParserOutput instead of calling this for redirects.
1411          *
1412          * @param $target Title|Array of destination(s) to redirect
1413          * @param $appendSubtitle Boolean [optional]
1414          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1415          * @return string containing HMTL with redirect link
1416          */
1417         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1418                 $lang = $this->getTitle()->getPageLanguage();
1419                 if ( $appendSubtitle ) {
1420                         $out = $this->getContext()->getOutput();
1421                         $out->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
1422                 }
1423                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1424         }
1425
1426         /**
1427          * Return the HTML for the top of a redirect page
1428          *
1429          * Chances are you should just be using the ParserOutput from
1430          * WikitextContent::getParserOutput instead of calling this for redirects.
1431          *
1432          * @since 1.23
1433          * @param Language $lang
1434          * @param Title|array $target destination(s) to redirect
1435          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1436          * @return string containing HMTL with redirect link
1437          */
1438         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1439                 global $wgStylePath;
1440
1441                 if ( !is_array( $target ) ) {
1442                         $target = array( $target );
1443                 }
1444
1445                 $imageDir = $lang->getDir();
1446
1447                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1448
1449                 /**
1450                  * @var $title Title
1451                  */
1452                 $title = array_shift( $target );
1453
1454                 if ( $forceKnown ) {
1455                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1456                 } else {
1457                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1458                 }
1459
1460                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1461                 $alt = $lang->isRTL() ? '←' : '→';
1462                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1463                 foreach ( $target as $rt ) {
1464                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1465                         if ( $forceKnown ) {
1466                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1467                         } else {
1468                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1469                         }
1470                 }
1471
1472                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1473                 return '<div class="redirectMsg">' .
1474                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1475                         '<span class="redirectText">' . $link . '</span></div>';
1476         }
1477
1478         /**
1479          * Handle action=render
1480          */
1481         public function render() {
1482                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1483                 $this->view();
1484         }
1485
1486         /**
1487          * action=protect handler
1488          */
1489         public function protect() {
1490                 $form = new ProtectionForm( $this );
1491                 $form->execute();
1492         }
1493
1494         /**
1495          * action=unprotect handler (alias)
1496          */
1497         public function unprotect() {
1498                 $this->protect();
1499         }
1500
1501         /**
1502          * UI entry point for page deletion
1503          */
1504         public function delete() {
1505                 # This code desperately needs to be totally rewritten
1506
1507                 $title = $this->getTitle();
1508                 $user = $this->getContext()->getUser();
1509
1510                 # Check permissions
1511                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1512                 if ( count( $permission_errors ) ) {
1513                         throw new PermissionsError( 'delete', $permission_errors );
1514                 }
1515
1516                 # Read-only check...
1517                 if ( wfReadOnly() ) {
1518                         throw new ReadOnlyError;
1519                 }
1520
1521                 # Better double-check that it hasn't been deleted yet!
1522                 $this->mPage->loadPageData( 'fromdbmaster' );
1523                 if ( !$this->mPage->exists() ) {
1524                         $deleteLogPage = new LogPage( 'delete' );
1525                         $outputPage = $this->getContext()->getOutput();
1526                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1527                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1528                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1529                                 );
1530                         $outputPage->addHTML(
1531                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1532                         );
1533                         LogEventsList::showLogExtract(
1534                                 $outputPage,
1535                                 'delete',
1536                                 $title
1537                         );
1538
1539                         return;
1540                 }
1541
1542                 $request = $this->getContext()->getRequest();
1543                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1544                 $deleteReason = $request->getText( 'wpReason' );
1545
1546                 if ( $deleteReasonList == 'other' ) {
1547                         $reason = $deleteReason;
1548                 } elseif ( $deleteReason != '' ) {
1549                         // Entry from drop down menu + additional comment
1550                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1551                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1552                 } else {
1553                         $reason = $deleteReasonList;
1554                 }
1555
1556                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1557                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1558                 ) {
1559                         # Flag to hide all contents of the archived revisions
1560                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1561
1562                         $this->doDelete( $reason, $suppress );
1563
1564                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1565
1566                         return;
1567                 }
1568
1569                 // Generate deletion reason
1570                 $hasHistory = false;
1571                 if ( !$reason ) {
1572                         try {
1573                                 $reason = $this->generateReason( $hasHistory );
1574                         } catch ( MWException $e ) {
1575                                 # if a page is horribly broken, we still want to be able to delete it. so be lenient about errors here.
1576                                 wfDebug( "Error while building auto delete summary: $e" );
1577                                 $reason = '';
1578                         }
1579                 }
1580
1581                 // If the page has a history, insert a warning
1582                 if ( $hasHistory ) {
1583                         $revisions = $this->mTitle->estimateRevisionCount();
1584                         // @todo FIXME: i18n issue/patchwork message
1585                         $this->getContext()->getOutput()->addHTML( '<strong class="mw-delete-warning-revisions">' .
1586                                 wfMessage( 'historywarning' )->numParams( $revisions )->parse() .
1587                                 wfMessage( 'word-separator' )->plain() . Linker::linkKnown( $title,
1588                                         wfMessage( 'history' )->escaped(),
1589                                         array( 'rel' => 'archives' ),
1590                                         array( 'action' => 'history' ) ) .
1591                                 '</strong>'
1592                         );
1593
1594                         if ( $this->mTitle->isBigDeletion() ) {
1595                                 global $wgDeleteRevisionsLimit;
1596                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1597                                         array( 'delete-warning-toobig', $this->getContext()->getLanguage()->formatNum( $wgDeleteRevisionsLimit ) ) );
1598                         }
1599                 }
1600
1601                 $this->confirmDelete( $reason );
1602         }
1603
1604         /**
1605          * Output deletion confirmation dialog
1606          * @todo FIXME: Move to another file?
1607          * @param string $reason prefilled reason
1608          */
1609         public function confirmDelete( $reason ) {
1610                 wfDebug( "Article::confirmDelete\n" );
1611
1612                 $outputPage = $this->getContext()->getOutput();
1613                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1614                 $outputPage->addBacklinkSubtitle( $this->getTitle() );
1615                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1616                 $backlinkCache = $this->getTitle()->getBacklinkCache();
1617                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1618                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1619                                 'deleting-backlinks-warning' );
1620                 }
1621                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1622
1623                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1624
1625                 $user = $this->getContext()->getUser();
1626
1627                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1628                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1629                                         <td></td>
1630                                         <td class='mw-input'><strong>" .
1631                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1632                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1633                                         "</strong></td>
1634                                 </tr>";
1635                 } else {
1636                         $suppress = '';
1637                 }
1638                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $this->getTitle() );
1639
1640                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1641                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1642                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1643                         Xml::tags( 'legend', null, wfMessage( 'delete-legend' )->escaped() ) .
1644                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1645                         "<tr id=\"wpDeleteReasonListRow\">
1646                                 <td class='mw-label'>" .
1647                                         Xml::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1648                                 "</td>
1649                                 <td class='mw-input'>" .
1650                                         Xml::listDropDown( 'wpDeleteReasonList',
1651                                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1652                                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(), '', 'wpReasonDropDown', 1 ) .
1653                                 "</td>
1654                         </tr>
1655                         <tr id=\"wpDeleteReasonRow\">
1656                                 <td class='mw-label'>" .
1657                                         Xml::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1658                                 "</td>
1659                                 <td class='mw-input'>" .
1660                                 Html::input( 'wpReason', $reason, 'text', array(
1661                                         'size' => '60',
1662                                         'maxlength' => '255',
1663                                         'tabindex' => '2',
1664                                         'id' => 'wpReason',
1665                                         'autofocus'
1666                                 ) ) .
1667                                 "</td>
1668                         </tr>";
1669
1670                 # Disallow watching if user is not logged in
1671                 if ( $user->isLoggedIn() ) {
1672                         $form .= "
1673                         <tr>
1674                                 <td></td>
1675                                 <td class='mw-input'>" .
1676                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1677                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1678                                 "</td>
1679                         </tr>";
1680                 }
1681
1682                 $form .= "
1683                         $suppress
1684                         <tr>
1685                                 <td></td>
1686                                 <td class='mw-submit'>" .
1687                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1688                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1689                                 "</td>
1690                         </tr>" .
1691                         Xml::closeElement( 'table' ) .
1692                         Xml::closeElement( 'fieldset' ) .
1693                         Html::hidden( 'wpEditToken', $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1694                         Xml::closeElement( 'form' );
1695
1696                         if ( $user->isAllowed( 'editinterface' ) ) {
1697                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1698                                 $link = Linker::link(
1699                                         $title,
1700                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1701                                         array(),
1702                                         array( 'action' => 'edit' )
1703                                 );
1704                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1705                         }
1706
1707                 $outputPage->addHTML( $form );
1708
1709                 $deleteLogPage = new LogPage( 'delete' );
1710                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1711                 LogEventsList::showLogExtract( $outputPage, 'delete',
1712                         $this->getTitle()
1713                 );
1714         }
1715
1716         /**
1717          * Perform a deletion and output success or failure messages
1718          * @param $reason
1719          * @param $suppress bool
1720          */
1721         public function doDelete( $reason, $suppress = false ) {
1722                 $error = '';
1723                 $outputPage = $this->getContext()->getOutput();
1724                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1725                 if ( $status->isGood() ) {
1726                         $deleted = $this->getTitle()->getPrefixedText();
1727
1728                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1729                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1730
1731                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1732
1733                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1734                         $outputPage->returnToMain( false );
1735                 } else {
1736                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1737                         if ( $error == '' ) {
1738                                 $outputPage->addWikiText(
1739                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1740                                 );
1741                                 $deleteLogPage = new LogPage( 'delete' );
1742                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1743
1744                                 LogEventsList::showLogExtract(
1745                                         $outputPage,
1746                                         'delete',
1747                                         $this->getTitle()
1748                                 );
1749                         } else {
1750                                 $outputPage->addHTML( $error );
1751                         }
1752                 }
1753         }
1754
1755         /* Caching functions */
1756
1757         /**
1758          * checkLastModified returns true if it has taken care of all
1759          * output to the client that is necessary for this request.
1760          * (that is, it has sent a cached version of the page)
1761          *
1762          * @return boolean true if cached version send, false otherwise
1763          */
1764         protected function tryFileCache() {
1765                 static $called = false;
1766
1767                 if ( $called ) {
1768                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1769                         return false;
1770                 }
1771
1772                 $called = true;
1773                 if ( $this->isFileCacheable() ) {
1774                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1775                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1776                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1777                                 $cache->loadFromFileCache( $this->getContext() );
1778                                 return true;
1779                         } else {
1780                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1781                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1782                         }
1783                 } else {
1784                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1785                 }
1786
1787                 return false;
1788         }
1789
1790         /**
1791          * Check if the page can be cached
1792          * @return bool
1793          */
1794         public function isFileCacheable() {
1795                 $cacheable = false;
1796
1797                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1798                         $cacheable = $this->mPage->getID()
1799                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1800                         // Extension may have reason to disable file caching on some pages.
1801                         if ( $cacheable ) {
1802                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1803                         }
1804                 }
1805
1806                 return $cacheable;
1807         }
1808
1809         /**#@-*/
1810
1811         /**
1812          * Lightweight method to get the parser output for a page, checking the parser cache
1813          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1814          * consider, so it's not appropriate to use there.
1815          *
1816          * @since 1.16 (r52326) for LiquidThreads
1817          *
1818          * @param $oldid mixed integer Revision ID or null
1819          * @param $user User The relevant user
1820          * @return ParserOutput or false if the given revision ID is not found
1821          */
1822         public function getParserOutput( $oldid = null, User $user = null ) {
1823                 //XXX: bypasses mParserOptions and thus setParserOptions()
1824
1825                 if ( $user === null ) {
1826                         $parserOptions = $this->getParserOptions();
1827                 } else {
1828                         $parserOptions = $this->mPage->makeParserOptions( $user );
1829                 }
1830
1831                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1832         }
1833
1834         /**
1835          * Override the ParserOptions used to render the primary article wikitext.
1836          *
1837          * @param ParserOptions $options
1838          * @throws MWException if the parser options where already initialized.
1839          */
1840         public function setParserOptions( ParserOptions $options ) {
1841                 if ( $this->mParserOptions ) {
1842                         throw new MWException( "can't change parser options after they have already been set" );
1843                 }
1844
1845                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1846                 $this->mParserOptions = clone $options;
1847         }
1848
1849         /**
1850          * Get parser options suitable for rendering the primary article wikitext
1851          * @return ParserOptions
1852          */
1853         public function getParserOptions() {
1854                 if ( !$this->mParserOptions ) {
1855                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1856                 }
1857                 // Clone to allow modifications of the return value without affecting cache
1858                 return clone $this->mParserOptions;
1859         }
1860
1861         /**
1862          * Sets the context this Article is executed in
1863          *
1864          * @param $context IContextSource
1865          * @since 1.18
1866          */
1867         public function setContext( $context ) {
1868                 $this->mContext = $context;
1869         }
1870
1871         /**
1872          * Gets the context this Article is executed in
1873          *
1874          * @return IContextSource
1875          * @since 1.18
1876          */
1877         public function getContext() {
1878                 if ( $this->mContext instanceof IContextSource ) {
1879                         return $this->mContext;
1880                 } else {
1881                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1882                         return RequestContext::getMain();
1883                 }
1884         }
1885
1886         /**
1887          * Info about this page
1888          * @deprecated since 1.19
1889          */
1890         public function info() {
1891                 wfDeprecated( __METHOD__, '1.19' );
1892                 Action::factory( 'info', $this )->show();
1893         }
1894
1895         /**
1896          * Handle action=purge
1897          * @deprecated since 1.19
1898          * @return Action|bool|null false if the action is disabled, null if it is not recognised
1899          */
1900         public function purge() {
1901                 return Action::factory( 'purge', $this )->show();
1902         }
1903
1904         /**
1905          * Handle action=revert
1906          * @deprecated since 1.19
1907          */
1908         public function revert() {
1909                 wfDeprecated( __METHOD__, '1.19' );
1910                 Action::factory( 'revert', $this )->show();
1911         }
1912
1913         /**
1914          * Handle action=rollback
1915          * @deprecated since 1.19
1916          */
1917         public function rollback() {
1918                 wfDeprecated( __METHOD__, '1.19' );
1919                 Action::factory( 'rollback', $this )->show();
1920         }
1921
1922         /**
1923          * Use PHP's magic __get handler to handle accessing of
1924          * raw WikiPage fields for backwards compatibility.
1925          *
1926          * @param string $fname Field name
1927          */
1928         public function __get( $fname ) {
1929                 if ( property_exists( $this->mPage, $fname ) ) {
1930                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1931                         return $this->mPage->$fname;
1932                 }
1933                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1934         }
1935
1936         /**
1937          * Use PHP's magic __set handler to handle setting of
1938          * raw WikiPage fields for backwards compatibility.
1939          *
1940          * @param string $fname Field name
1941          * @param $fvalue mixed New value
1942          */
1943         public function __set( $fname, $fvalue ) {
1944                 if ( property_exists( $this->mPage, $fname ) ) {
1945                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1946                         $this->mPage->$fname = $fvalue;
1947                 // Note: extensions may want to toss on new fields
1948                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1949                         $this->mPage->$fname = $fvalue;
1950                 } else {
1951                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1952                 }
1953         }
1954
1955         /**
1956          * Use PHP's magic __call handler to transform instance calls to
1957          * WikiPage functions for backwards compatibility.
1958          *
1959          * @param string $fname Name of called method
1960          * @param array $args Arguments to the method
1961          * @return mixed
1962          */
1963         public function __call( $fname, $args ) {
1964                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1965                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1966                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1967                 }
1968                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1969         }
1970
1971         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1972
1973         /**
1974          * @param $limit array
1975          * @param $expiry array
1976          * @param $cascade bool
1977          * @param $reason string
1978          * @param $user User
1979          * @return Status
1980          */
1981         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1982                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
1983         }
1984
1985         /**
1986          * @param $limit array
1987          * @param $reason string
1988          * @param $cascade int
1989          * @param $expiry array
1990          * @return bool
1991          */
1992         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1993                 return $this->mPage->doUpdateRestrictions(
1994                         $limit,
1995                         $expiry,
1996                         $cascade,
1997                         $reason,
1998                         $this->getContext()->getUser()
1999                 );
2000         }
2001
2002         /**
2003          * @param $reason string
2004          * @param $suppress bool
2005          * @param $id int
2006          * @param $commit bool
2007          * @param $error string
2008          * @return bool
2009          */
2010         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
2011                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2012         }
2013
2014         /**
2015          * @param $fromP
2016          * @param $summary
2017          * @param $token
2018          * @param $bot
2019          * @param $resultDetails
2020          * @param $user User
2021          * @return array
2022          */
2023         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2024                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2025                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2026         }
2027
2028         /**
2029          * @param $fromP
2030          * @param $summary
2031          * @param $bot
2032          * @param $resultDetails
2033          * @param $guser User
2034          * @return array
2035          */
2036         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2037                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2038                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2039         }
2040
2041         /**
2042          * @param $hasHistory bool
2043          * @return mixed
2044          */
2045         public function generateReason( &$hasHistory ) {
2046                 $title = $this->mPage->getTitle();
2047                 $handler = ContentHandler::getForTitle( $title );
2048                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2049         }
2050
2051         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2052
2053         /**
2054          * @return array
2055          */
2056         public static function selectFields() {
2057                 return WikiPage::selectFields();
2058         }
2059
2060         /**
2061          * @param $title Title
2062          */
2063         public static function onArticleCreate( $title ) {
2064                 WikiPage::onArticleCreate( $title );
2065         }
2066
2067         /**
2068          * @param $title Title
2069          */
2070         public static function onArticleDelete( $title ) {
2071                 WikiPage::onArticleDelete( $title );
2072         }
2073
2074         /**
2075          * @param $title Title
2076          */
2077         public static function onArticleEdit( $title ) {
2078                 WikiPage::onArticleEdit( $title );
2079         }
2080
2081         /**
2082          * @param $oldtext
2083          * @param $newtext
2084          * @param $flags
2085          * @return string
2086          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2087          */
2088         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2089                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2090         }
2091         // ******
2092 }