includes/Article.php

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