includes/WikiPage.php

   1 <?php
   2 /**
   3  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
   4  */
   5 abstract class Page {}
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * Some fields are public only for backwards-compatibility. Use accessors.
  11  * In the past, this class was part of Article.php and everything was public.
  12  *
  13  * @internal documentation reviewed 15 Mar 2010
  14  */
  15 class WikiPage extends Page {
  16         // doDeleteArticleReal() return values. Values less than zero indicate fatal errors,
  17         // values greater than zero indicate that there were problems not resulting in page
  18         // not being deleted
  19
  20         /**
  21          * Delete operation aborted by hook
  22          */
  23         const DELETE_HOOK_ABORTED = -1;
  24
  25         /**
  26          * Deletion successful
  27          */
  28         const DELETE_SUCCESS = 0;
  29
  30         /**
  31          * Page not found
  32          */
  33         const DELETE_NO_PAGE = 1;
  34
  35         /**
  36          * No revisions found to delete
  37          */
  38         const DELETE_NO_REVISIONS = 2;
  39
  40         /**
  41          * @var Title
  42          */
  43         public $mTitle = null;
  44
  45         /**@{{
  46          * @protected
  47          */
  48         public $mDataLoaded = false;         // !< Boolean
  49         public $mIsRedirect = false;         // !< Boolean
  50         public $mLatest = false;             // !< Integer (false means "not loaded")
  51         public $mPreparedEdit = false;       // !< Array
  52         /**@}}*/
  53
  54         /**
  55          * @var Title
  56          */
  57         protected $mRedirectTarget = null;
  58
  59         /**
  60          * @var Revision
  61          */
  62         protected $mLastRevision = null;
  63
  64         /**
  65          * @var string; timestamp of the current revision or empty string if not loaded
  66          */
  67         protected $mTimestamp = '';
  68
  69         /**
  70          * @var string
  71          */
  72         protected $mTouched = '19700101000000';
  73
  74         /**
  75          * @var int|null
  76          */
  77         protected $mCounter = null;
  78
  79         /**
  80          * Constructor and clear the article
  81          * @param $title Title Reference to a Title object.
  82          */
  83         public function __construct( Title $title ) {
  84                 $this->mTitle = $title;
  85         }
  86
  87         /**
  88          * Create a WikiPage object of the appropriate class for the given title.
  89          *
  90          * @param $title Title
  91          * @return WikiPage object of the appropriate type
  92          */
  93         public static function factory( Title $title ) {
  94                 $ns = $title->getNamespace();
  95
  96                 if ( $ns == NS_MEDIA ) {
  97                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  98                 } elseif ( $ns < 0 ) {
  99                         throw new MWException( "Invalid or virtual namespace $ns given." );
 100                 }
 101
 102                 switch ( $ns ) {
 103                         case NS_FILE:
 104                                 $page = new WikiFilePage( $title );
 105                                 break;
 106                         case NS_CATEGORY:
 107                                 $page = new WikiCategoryPage( $title );
 108                                 break;
 109                         default:
 110                                 $page = new WikiPage( $title );
 111                 }
 112
 113                 return $page;
 114         }
 115
 116         /**
 117          * Constructor from a page id
 118          *
 119          * @param $id Int article ID to load
 120          *
 121          * @return WikiPage|null
 122          */
 123         public static function newFromID( $id ) {
 124                 $t = Title::newFromID( $id );
 125                 if ( $t ) {
 126                         return self::factory( $t );
 127                 }
 128                 return null;
 129         }
 130
 131         /**
 132          * Returns overrides for action handlers.
 133          * Classes listed here will be used instead of the default one when
 134          * (and only when) $wgActions[$action] === true. This allows subclasses
 135          * to override the default behavior.
 136          *
 137          * @todo: move this UI stuff somewhere else
 138          *
 139          * @return Array
 140          */
 141         public function getActionOverrides() {
 142         $content_handler = $this->getContentHandler();
 143                 return $content_handler->getActionOverrides();
 144         }
 145
 146     /**
 147      * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 148      *
 149      * Shorthand for ContentHandler::getForModelName( $this->getContentModelName() );
 150      *
 151      * @return ContentHandler
 152      *
 153      * @since 1.WD
 154      */
 155     public function getContentHandler() {
 156         return ContentHandler::getForModelName( $this->getContentModelName() );
 157     }
 158
 159         /**
 160          * Get the title object of the article
 161          * @return Title object of this page
 162          */
 163         public function getTitle() {
 164                 return $this->mTitle;
 165         }
 166
 167         /**
 168          * Clear the object
 169          */
 170         public function clear() {
 171                 $this->mDataLoaded = false;
 172
 173                 $this->mCounter = null;
 174                 $this->mRedirectTarget = null; # Title object if set
 175                 $this->mLastRevision = null; # Latest revision
 176                 $this->mTouched = '19700101000000';
 177                 $this->mTimestamp = '';
 178                 $this->mIsRedirect = false;
 179                 $this->mLatest = false;
 180                 $this->mPreparedEdit = false;
 181         }
 182
 183         /**
 184          * Return the list of revision fields that should be selected to create
 185          * a new page.
 186          *
 187          * @return array
 188          */
 189         public static function selectFields() {
 190                 return array(
 191                         'page_id',
 192                         'page_namespace',
 193                         'page_title',
 194                         'page_restrictions',
 195                         'page_counter',
 196                         'page_is_redirect',
 197                         'page_is_new',
 198                         'page_random',
 199                         'page_touched',
 200                         'page_latest',
 201                         'page_len',
 202             'page_content_model',
 203                 );
 204         }
 205
 206         /**
 207          * Fetch a page record with the given conditions
 208          * @param $dbr DatabaseBase object
 209          * @param $conditions Array
 210          * @return mixed Database result resource, or false on failure
 211          */
 212         protected function pageData( $dbr, $conditions ) {
 213                 $fields = self::selectFields();
 214
 215                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 216
 217                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 218
 219                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 220
 221                 return $row;
 222         }
 223
 224         /**
 225          * Fetch a page record matching the Title object's namespace and title
 226          * using a sanitized title string
 227          *
 228          * @param $dbr DatabaseBase object
 229          * @param $title Title object
 230          * @return mixed Database result resource, or false on failure
 231          */
 232         public function pageDataFromTitle( $dbr, $title ) {
 233                 return $this->pageData( $dbr, array(
 234                         'page_namespace' => $title->getNamespace(),
 235                         'page_title'     => $title->getDBkey() ) );
 236         }
 237
 238         /**
 239          * Fetch a page record matching the requested ID
 240          *
 241          * @param $dbr DatabaseBase
 242          * @param $id Integer
 243          * @return mixed Database result resource, or false on failure
 244          */
 245         public function pageDataFromId( $dbr, $id ) {
 246                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 247         }
 248
 249         /**
 250          * Set the general counter, title etc data loaded from
 251          * some source.
 252          *
 253          * @param $data Object|String One of the following:
 254          *              A DB query result object or...
 255          *              "fromdb" to get from a slave DB or...
 256          *              "fromdbmaster" to get from the master DB
 257          * @return void
 258          */
 259         public function loadPageData( $data = 'fromdb' ) {
 260                 if ( $data === 'fromdbmaster' ) {
 261                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 262                 } elseif ( $data === 'fromdb' ) { // slave
 263                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 264                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 265                         # Note that DB also stores the master position in the session and checks it.
 266                         $touched = $this->getCachedLastEditTime();
 267                         if ( $touched ) { // key set
 268                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 269                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 270                                 }
 271                         }
 272                 }
 273
 274                 $lc = LinkCache::singleton();
 275
 276                 if ( $data ) {
 277                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 278
 279                         $this->mTitle->loadFromRow( $data );
 280
 281                         # Old-fashioned restrictions
 282                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 283
 284                         $this->mCounter     = intval( $data->page_counter );
 285                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 286                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 287                         $this->mLatest      = intval( $data->page_latest );
 288                 } else {
 289                         $lc->addBadLinkObj( $this->mTitle );
 290
 291                         $this->mTitle->loadFromRow( false );
 292                 }
 293
 294                 $this->mDataLoaded = true;
 295         }
 296
 297         /**
 298          * @return int Page ID
 299          */
 300         public function getId() {
 301                 return $this->mTitle->getArticleID();
 302         }
 303
 304         /**
 305          * @return bool Whether or not the page exists in the database
 306          */
 307         public function exists() {
 308                 return $this->mTitle->exists();
 309         }
 310
 311         /**
 312          * Check if this page is something we're going to be showing
 313          * some sort of sensible content for. If we return false, page
 314          * views (plain action=view) will return an HTTP 404 response,
 315          * so spiders and robots can know they're following a bad link.
 316          *
 317          * @return bool
 318          */
 319         public function hasViewableContent() {
 320                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 321         }
 322
 323         /**
 324          * @return int The view count for the page
 325          */
 326         public function getCount() {
 327                 if ( !$this->mDataLoaded ) {
 328                         $this->loadPageData();
 329                 }
 330
 331                 return $this->mCounter;
 332         }
 333
 334         /**
 335          * Tests if the article text represents a redirect
 336          *
 337          * @param $text mixed string containing article contents, or boolean
 338          * @return bool
 339          */
 340         public function isRedirect( $text = false ) {
 341         if ( $text === false ) $content = $this->getContent();
 342         else $content = ContentHandler::makeContent( $text, $this->mTitle ); # TODO: allow model and format to be provided; or better, expect a Content object
 343
 344
 345         if ( empty( $content ) ) return false;
 346         else return $content->isRedirect();
 347         }
 348
 349     /**
 350      * Returns the page's content model name. Will use the revisions actual content model if the page exists,
 351      * and the page's default if the page doesn't exist yet.
 352      *
 353      * @return int
 354      *
 355      * @since 1.WD
 356      */
 357     public function getContentModelName() {
 358         if ( $this->exists() ) {
 359             # look at the revision's actual content model
 360             $rev = $this->getRevision();
 361             return $rev->getContentModelName();
 362         } else {
 363             # use the default model for this page
 364             return $this->mTitle->getContentModelName();
 365         }
 366     }
 367
 368         /**
 369          * Loads page_touched and returns a value indicating if it should be used
 370          * @return boolean true if not a redirect
 371          */
 372         public function checkTouched() {
 373                 if ( !$this->mDataLoaded ) {
 374                         $this->loadPageData();
 375                 }
 376                 return !$this->mIsRedirect;
 377         }
 378
 379         /**
 380          * Get the page_touched field
 381          * @return string containing GMT timestamp
 382          */
 383         public function getTouched() {
 384                 if ( !$this->mDataLoaded ) {
 385                         $this->loadPageData();
 386                 }
 387                 return $this->mTouched;
 388         }
 389
 390         /**
 391          * Get the page_latest field
 392          * @return integer rev_id of current revision
 393          */
 394         public function getLatest() {
 395                 if ( !$this->mDataLoaded ) {
 396                         $this->loadPageData();
 397                 }
 398                 return (int)$this->mLatest;
 399         }
 400
 401         /**
 402          * Loads everything except the text
 403          * This isn't necessary for all uses, so it's only done if needed.
 404          */
 405         protected function loadLastEdit() {
 406                 if ( $this->mLastRevision !== null ) {
 407                         return; // already loaded
 408                 }
 409
 410                 $latest = $this->getLatest();
 411                 if ( !$latest ) {
 412                         return; // page doesn't exist or is missing page_latest info
 413                 }
 414
 415                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 416                 if ( $revision ) { // sanity
 417                         $this->setLastEdit( $revision );
 418                 }
 419         }
 420
 421         /**
 422          * Set the latest revision
 423          */
 424         protected function setLastEdit( Revision $revision ) {
 425                 $this->mLastRevision = $revision;
 426                 $this->mTimestamp = $revision->getTimestamp();
 427         }
 428
 429         /**
 430          * Get the latest revision
 431          * @return Revision|null
 432          */
 433         public function getRevision() {
 434                 $this->loadLastEdit();
 435                 if ( $this->mLastRevision ) {
 436                         return $this->mLastRevision;
 437                 }
 438                 return null;
 439         }
 440
 441     /**
 442      * Get the content of the current revision. No side-effects...
 443      *
 444      * @param $audience Integer: one of:
 445      *      Revision::FOR_PUBLIC       to be displayed to all users
 446      *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 447      *      Revision::RAW              get the text regardless of permissions
 448      * @return Content|null The content of the current revision
 449      *
 450      * @since 1.WD
 451      */
 452     public function getContent( $audience = Revision::FOR_PUBLIC ) {
 453         $this->loadLastEdit();
 454         if ( $this->mLastRevision ) {
 455             return $this->mLastRevision->getContent( $audience );
 456         }
 457         return null;
 458     }
 459
 460         /**
 461          * Get the text of the current revision. No side-effects...
 462          *
 463          * @param $audience Integer: one of:
 464          *      Revision::FOR_PUBLIC       to be displayed to all users
 465          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 466          *      Revision::RAW              get the text regardless of permissions
 467          * @return String|false The text of the current revision
 468      * @deprecated as of 1.WD, getContent() should be used instead.
 469          */
 470         public function getText( $audience = Revision::FOR_PUBLIC ) { #@todo: deprecated, replace usage!
 471         wfDeprecated( __METHOD__, '1.WD' );
 472
 473                 $this->loadLastEdit();
 474                 if ( $this->mLastRevision ) {
 475                         return $this->mLastRevision->getText( $audience );
 476                 }
 477                 return false;
 478         }
 479
 480         /**
 481          * Get the text of the current revision. No side-effects...
 482          *
 483          * @return String|bool The text of the current revision. False on failure
 484          * @deprecated as of 1.WD, getContent() should be used instead.
 485          */
 486         public function getRawText() { #@todo: deprecated, replace usage!
 487                 wfDeprecated( __METHOD__, '1.WD' );
 488
 489                 return $this->getText( Revision::RAW );
 490         }
 491
 492     /**
 493      * Get the content of the current revision. No side-effects...
 494      *
 495      * @return Contet|false The text of the current revision
 496      *
 497      * @since 1.WD
 498      */
 499     protected function getNativeData() { #FIXME: examine all uses carefully! caller must be aware of content model!
 500         $content = $this->getContent( Revision::RAW );
 501         if ( !$content ) return null;
 502
 503         return $content->getNativeData();
 504     }
 505
 506         /**
 507          * @return string MW timestamp of last article revision
 508          */
 509         public function getTimestamp() {
 510                 // Check if the field has been filled by WikiPage::setTimestamp()
 511                 if ( !$this->mTimestamp ) {
 512                         $this->loadLastEdit();
 513                 }
 514
 515                 return wfTimestamp( TS_MW, $this->mTimestamp );
 516         }
 517
 518         /**
 519          * Set the page timestamp (use only to avoid DB queries)
 520          * @param $ts string MW timestamp of last article revision
 521          * @return void
 522          */
 523         public function setTimestamp( $ts ) {
 524                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 525         }
 526
 527         /**
 528          * @param $audience Integer: one of:
 529          *      Revision::FOR_PUBLIC       to be displayed to all users
 530          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 531          *      Revision::RAW              get the text regardless of permissions
 532          * @return int user ID for the user that made the last article revision
 533          */
 534         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 535                 $this->loadLastEdit();
 536                 if ( $this->mLastRevision ) {
 537                         return $this->mLastRevision->getUser( $audience );
 538                 } else {
 539                         return -1;
 540                 }
 541         }
 542
 543         /**
 544          * @param $audience Integer: one of:
 545          *      Revision::FOR_PUBLIC       to be displayed to all users
 546          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 547          *      Revision::RAW              get the text regardless of permissions
 548          * @return string username of the user that made the last article revision
 549          */
 550         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 551                 $this->loadLastEdit();
 552                 if ( $this->mLastRevision ) {
 553                         return $this->mLastRevision->getUserText( $audience );
 554                 } else {
 555                         return '';
 556                 }
 557         }
 558
 559         /**
 560          * @param $audience Integer: one of:
 561          *      Revision::FOR_PUBLIC       to be displayed to all users
 562          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 563          *      Revision::RAW              get the text regardless of permissions
 564          * @return string Comment stored for the last article revision
 565          */
 566         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 567                 $this->loadLastEdit();
 568                 if ( $this->mLastRevision ) {
 569                         return $this->mLastRevision->getComment( $audience );
 570                 } else {
 571                         return '';
 572                 }
 573         }
 574
 575         /**
 576          * Returns true if last revision was marked as "minor edit"
 577          *
 578          * @return boolean Minor edit indicator for the last article revision.
 579          */
 580         public function getMinorEdit() {
 581                 $this->loadLastEdit();
 582                 if ( $this->mLastRevision ) {
 583                         return $this->mLastRevision->isMinor();
 584                 } else {
 585                         return false;
 586                 }
 587         }
 588
 589         /**
 590          * Get the cached timestamp for the last time the page changed.
 591          * This is only used to help handle slave lag by comparing to page_touched.
 592          * @return string MW timestamp
 593          */
 594         protected function getCachedLastEditTime() {
 595                 global $wgMemc;
 596                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 597                 return $wgMemc->get( $key );
 598         }
 599
 600         /**
 601          * Set the cached timestamp for the last time the page changed.
 602          * This is only used to help handle slave lag by comparing to page_touched.
 603          * @param $timestamp string
 604          * @return void
 605          */
 606         public function setCachedLastEditTime( $timestamp ) {
 607                 global $wgMemc;
 608                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 609                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 610         }
 611
 612         /**
 613          * Determine whether a page would be suitable for being counted as an
 614          * article in the site_stats table based on the title & its content
 615          *
 616          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 617          *        if false, the current database state will be used
 618          * @return Boolean
 619          */
 620         public function isCountable( $editInfo = false ) {
 621                 global $wgArticleCountMethod;
 622
 623                 if ( !$this->mTitle->isContentPage() ) {
 624                         return false;
 625                 }
 626
 627         if ( $editInfo ) {
 628             $content = $editInfo->pstContent;
 629         } else {
 630             $content = $this->getContent();
 631         }
 632
 633                 if ( !$content || $content->isRedirect( ) ) {
 634                         return false;
 635                 }
 636
 637         $hasLinks = null;
 638
 639         if ( $wgArticleCountMethod === 'link' ) {
 640             # nasty special case to avoid re-parsing to detect links
 641
 642             if ( $editInfo ) {
 643                 // ParserOutput::getLinks() is a 2D array of page links, so
 644                 // to be really correct we would need to recurse in the array
 645                 // but the main array should only have items in it if there are
 646                 // links.
 647                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 648             } else {
 649                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 650                     array( 'pl_from' => $this->getId() ), __METHOD__ );
 651             }
 652         }
 653
 654                 return $content->isCountable( $hasLinks );
 655         }
 656
 657         /**
 658          * If this page is a redirect, get its target
 659          *
 660          * The target will be fetched from the redirect table if possible.
 661          * If this page doesn't have an entry there, call insertRedirect()
 662          * @return Title|mixed object, or null if this page is not a redirect
 663          */
 664         public function getRedirectTarget() {
 665                 if ( !$this->mTitle->isRedirect() ) {
 666                         return null;
 667                 }
 668
 669                 if ( $this->mRedirectTarget !== null ) {
 670                         return $this->mRedirectTarget;
 671                 }
 672
 673                 # Query the redirect table
 674                 $dbr = wfGetDB( DB_SLAVE );
 675                 $row = $dbr->selectRow( 'redirect',
 676                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 677                         array( 'rd_from' => $this->getId() ),
 678                         __METHOD__
 679                 );
 680
 681                 // rd_fragment and rd_interwiki were added later, populate them if empty
 682                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 683                         return $this->mRedirectTarget = Title::makeTitle(
 684                                 $row->rd_namespace, $row->rd_title,
 685                                 $row->rd_fragment, $row->rd_interwiki );
 686                 }
 687
 688                 # This page doesn't have an entry in the redirect table
 689                 return $this->mRedirectTarget = $this->insertRedirect();
 690         }
 691
 692         /**
 693          * Insert an entry for this page into the redirect table.
 694          *
 695          * Don't call this function directly unless you know what you're doing.
 696          * @return Title object or null if not a redirect
 697          */
 698         public function insertRedirect() {
 699                 // recurse through to only get the final target
 700         $content = $this->getContent();
 701                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 702                 if ( !$retval ) {
 703                         return null;
 704                 }
 705                 $this->insertRedirectEntry( $retval );
 706                 return $retval;
 707         }
 708
 709         /**
 710          * Insert or update the redirect table entry for this page to indicate
 711          * it redirects to $rt .
 712          * @param $rt Title redirect target
 713          */
 714         public function insertRedirectEntry( $rt ) {
 715                 $dbw = wfGetDB( DB_MASTER );
 716                 $dbw->replace( 'redirect', array( 'rd_from' ),
 717                         array(
 718                                 'rd_from'      => $this->getId(),
 719                                 'rd_namespace' => $rt->getNamespace(),
 720                                 'rd_title'     => $rt->getDBkey(),
 721                                 'rd_fragment'  => $rt->getFragment(),
 722                                 'rd_interwiki' => $rt->getInterwiki(),
 723                         ),
 724                         __METHOD__
 725                 );
 726         }
 727
 728         /**
 729          * Get the Title object or URL this page redirects to
 730          *
 731          * @return mixed false, Title of in-wiki target, or string with URL
 732          */
 733         public function followRedirect() {
 734                 return $this->getRedirectURL( $this->getRedirectTarget() );
 735         }
 736
 737         /**
 738          * Get the Title object or URL to use for a redirect. We use Title
 739          * objects for same-wiki, non-special redirects and URLs for everything
 740          * else.
 741          * @param $rt Title Redirect target
 742          * @return mixed false, Title object of local target, or string with URL
 743          */
 744         public function getRedirectURL( $rt ) {
 745                 if ( !$rt ) {
 746                         return false;
 747                 }
 748
 749                 if ( $rt->isExternal() ) {
 750                         if ( $rt->isLocal() ) {
 751                                 // Offsite wikis need an HTTP redirect.
 752                                 //
 753                                 // This can be hard to reverse and may produce loops,
 754                                 // so they may be disabled in the site configuration.
 755                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 756                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 757                         } else {
 758                                 // External pages pages without "local" bit set are not valid
 759                                 // redirect targets
 760                                 return false;
 761                         }
 762                 }
 763
 764                 if ( $rt->isSpecialPage() ) {
 765                         // Gotta handle redirects to special pages differently:
 766                         // Fill the HTTP response "Location" header and ignore
 767                         // the rest of the page we're on.
 768                         //
 769                         // Some pages are not valid targets
 770                         if ( $rt->isValidRedirectTarget() ) {
 771                                 return $rt->getFullURL();
 772                         } else {
 773                                 return false;
 774                         }
 775                 }
 776
 777                 return $rt;
 778         }
 779
 780         /**
 781          * Get a list of users who have edited this article, not including the user who made
 782          * the most recent revision, which you can get from $article->getUser() if you want it
 783          * @return UserArrayFromResult
 784          */
 785         public function getContributors() {
 786                 # @todo FIXME: This is expensive; cache this info somewhere.
 787
 788                 $dbr = wfGetDB( DB_SLAVE );
 789
 790                 if ( $dbr->implicitGroupby() ) {
 791                         $realNameField = 'user_real_name';
 792                 } else {
 793                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 794                 }
 795
 796                 $tables = array( 'revision', 'user' );
 797
 798                 $fields = array(
 799                         'rev_user as user_id',
 800                         'rev_user_text AS user_name',
 801                         $realNameField,
 802                         'MAX(rev_timestamp) AS timestamp',
 803                 );
 804
 805                 $conds = array( 'rev_page' => $this->getId() );
 806
 807                 // The user who made the top revision gets credited as "this page was last edited by
 808                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 809                 $user = $this->getUser();
 810                 if ( $user ) {
 811                         $conds[] = "rev_user != $user";
 812                 } else {
 813                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 814                 }
 815
 816                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 817
 818                 $jconds = array(
 819                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 820                 );
 821
 822                 $options = array(
 823                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 824                         'ORDER BY' => 'timestamp DESC',
 825                 );
 826
 827                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 828                 return new UserArrayFromResult( $res );
 829         }
 830
 831         /**
 832          * Get the last N authors
 833          * @param $num Integer: number of revisions to get
 834          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 835          * @return array Array of authors, duplicates not removed
 836          */
 837         public function getLastNAuthors( $num, $revLatest = 0 ) {
 838                 wfProfileIn( __METHOD__ );
 839                 // First try the slave
 840                 // If that doesn't have the latest revision, try the master
 841                 $continue = 2;
 842                 $db = wfGetDB( DB_SLAVE );
 843
 844                 do {
 845                         $res = $db->select( array( 'page', 'revision' ),
 846                                 array( 'rev_id', 'rev_user_text' ),
 847                                 array(
 848                                         'page_namespace' => $this->mTitle->getNamespace(),
 849                                         'page_title' => $this->mTitle->getDBkey(),
 850                                         'rev_page = page_id'
 851                                 ), __METHOD__,
 852                                 array(
 853                                         'ORDER BY' => 'rev_timestamp DESC',
 854                                         'LIMIT' => $num
 855                                 )
 856                         );
 857
 858                         if ( !$res ) {
 859                                 wfProfileOut( __METHOD__ );
 860                                 return array();
 861                         }
 862
 863                         $row = $db->fetchObject( $res );
 864
 865                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 866                                 $db = wfGetDB( DB_MASTER );
 867                                 $continue--;
 868                         } else {
 869                                 $continue = 0;
 870                         }
 871                 } while ( $continue );
 872
 873                 $authors = array( $row->rev_user_text );
 874
 875                 foreach ( $res as $row ) {
 876                         $authors[] = $row->rev_user_text;
 877                 }
 878
 879                 wfProfileOut( __METHOD__ );
 880                 return $authors;
 881         }
 882
 883         /**
 884          * Should the parser cache be used?
 885          *
 886          * @param $parserOptions ParserOptions to check
 887          * @param $oldid int
 888          * @return boolean
 889          */
 890         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 891                 global $wgEnableParserCache;
 892
 893                 return $wgEnableParserCache
 894                         && $parserOptions->getStubThreshold() == 0
 895                         && $this->mTitle->exists()
 896                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 897                         && $this->getContentHandler()->isParserCacheSupported();
 898         }
 899
 900         /**
 901          * Get a ParserOutput for the given ParserOptions and revision ID.
 902          * The parser cache will be used if possible.
 903          *
 904          * @since 1.19
 905          * @param $parserOptions ParserOptions to use for the parse operation
 906          * @param $oldid Revision ID to get the text from, passing null or 0 will
 907          *               get the current revision (default value)
 908          * @param $context IContextSource context for parsing
 909          *
 910          * @return ParserOutput or false if the revision was not found
 911          */
 912         public function getParserOutput( ParserOptions $parserOptions, $oldid = null, IContextSource $context = null ) {
 913                 wfProfileIn( __METHOD__ );
 914
 915                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 916                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 917                 if ( $parserOptions->getStubThreshold() ) {
 918                         wfIncrStats( 'pcache_miss_stub' );
 919                 }
 920
 921                 if ( $useParserCache ) {
 922                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 923                         if ( $parserOutput !== false ) {
 924                                 wfProfileOut( __METHOD__ );
 925                                 return $parserOutput;
 926                         }
 927                 }
 928
 929                 if ( $oldid === null || $oldid === 0 ) {
 930                         $oldid = $this->getLatest();
 931                 }
 932
 933                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache, null, $context );
 934                 $pool->execute();
 935
 936                 wfProfileOut( __METHOD__ );
 937
 938                 return $pool->getParserOutput();
 939         }
 940
 941         /**
 942          * Do standard deferred updates after page view
 943          * @param $user User The relevant user
 944          */
 945         public function doViewUpdates( User $user ) {
 946                 global $wgDisableCounters;
 947                 if ( wfReadOnly() ) {
 948                         return;
 949                 }
 950
 951                 # Don't update page view counters on views from bot users (bug 14044)
 952                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
 953                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
 954                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
 955                 }
 956
 957                 # Update newtalk / watchlist notification status
 958                 $user->clearNotification( $this->mTitle );
 959         }
 960
 961         /**
 962          * Perform the actions of a page purging
 963          * @return bool
 964          */
 965         public function doPurge() {
 966                 global $wgUseSquid;
 967
 968                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 969                         return false;
 970                 }
 971
 972                 // Invalidate the cache
 973                 $this->mTitle->invalidateCache();
 974                 $this->clear();
 975
 976                 if ( $wgUseSquid ) {
 977                         // Commit the transaction before the purge is sent
 978                         $dbw = wfGetDB( DB_MASTER );
 979                         $dbw->commit( __METHOD__ );
 980
 981                         // Send purge
 982                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 983                         $update->doUpdate();
 984                 }
 985
 986                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 987                         if ( $this->mTitle->exists() ) {
 988                                 $text = $this->getNativeData(); #FIXME: may not be a string. check Content model!
 989                         } else {
 990                                 $text = false;
 991                         }
 992
 993                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 994                 }
 995                 return true;
 996         }
 997
 998         /**
 999          * Insert a new empty page record for this article.
1000          * This *must* be followed up by creating a revision
1001          * and running $this->updateRevisionOn( ... );
1002          * or else the record will be left in a funky state.
1003          * Best if all done inside a transaction.
1004          *
1005          * @param $dbw DatabaseBase
1006          * @return int The newly created page_id key, or false if the title already existed
1007          */
1008         public function insertOn( $dbw ) {
1009                 wfProfileIn( __METHOD__ );
1010
1011                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1012                 $dbw->insert( 'page', array(
1013                         'page_id'           => $page_id,
1014                         'page_namespace'    => $this->mTitle->getNamespace(),
1015                         'page_title'        => $this->mTitle->getDBkey(),
1016                         'page_counter'      => 0,
1017                         'page_restrictions' => '',
1018                         'page_is_redirect'  => 0, # Will set this shortly...
1019                         'page_is_new'       => 1,
1020                         'page_random'       => wfRandom(),
1021                         'page_touched'      => $dbw->timestamp(),
1022                         'page_latest'       => 0, # Fill this in shortly...
1023                         'page_len'          => 0, # Fill this in shortly...
1024                 ), __METHOD__, 'IGNORE' );
1025
1026                 $affected = $dbw->affectedRows();
1027
1028                 if ( $affected ) {
1029                         $newid = $dbw->insertId();
1030                         $this->mTitle->resetArticleID( $newid );
1031                 }
1032                 wfProfileOut( __METHOD__ );
1033
1034                 return $affected ? $newid : false;
1035         }
1036
1037         /**
1038          * Update the page record to point to a newly saved revision.
1039          *
1040          * @param $dbw DatabaseBase: object
1041          * @param $revision Revision: For ID number, and text used to set
1042          *                  length and redirect status fields
1043          * @param $lastRevision Integer: if given, will not overwrite the page field
1044          *                      when different from the currently set value.
1045          *                      Giving 0 indicates the new page flag should be set
1046          *                      on.
1047          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1048          *                           removing rows in redirect table.
1049          * @return bool true on success, false on failure
1050          * @private
1051          */
1052         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1053                 wfProfileIn( __METHOD__ );
1054
1055         $content = $revision->getContent();
1056                 $len = $content->getSize();
1057                 $rt = $content->getUltimateRedirectTarget();
1058
1059                 $conditions = array( 'page_id' => $this->getId() );
1060
1061                 if ( !is_null( $lastRevision ) ) {
1062                         # An extra check against threads stepping on each other
1063                         $conditions['page_latest'] = $lastRevision;
1064                 }
1065
1066                 $now = wfTimestampNow();
1067                 $dbw->update( 'page',
1068                         array( /* SET */
1069                                 'page_latest'      => $revision->getId(),
1070                                 'page_touched'     => $dbw->timestamp( $now ),
1071                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1072                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1073                                 'page_len'         => $len,
1074                                 'page_content_model' => $revision->getContentModelName(),
1075                         ),
1076                         $conditions,
1077                         __METHOD__ );
1078
1079                 $result = $dbw->affectedRows() != 0;
1080                 if ( $result ) {
1081                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1082                         $this->setLastEdit( $revision );
1083                         $this->setCachedLastEditTime( $now );
1084                         $this->mLatest = $revision->getId();
1085                         $this->mIsRedirect = (bool)$rt;
1086                         # Update the LinkCache.
1087                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1088                 }
1089
1090                 wfProfileOut( __METHOD__ );
1091                 return $result;
1092         }
1093
1094         /**
1095          * Add row to the redirect table if this is a redirect, remove otherwise.
1096          *
1097          * @param $dbw DatabaseBase
1098          * @param $redirectTitle Title object pointing to the redirect target,
1099          *                       or NULL if this is not a redirect
1100          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1101          *                           removing rows in redirect table.
1102          * @return bool true on success, false on failure
1103          * @private
1104          */
1105         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1106                 // Always update redirects (target link might have changed)
1107                 // Update/Insert if we don't know if the last revision was a redirect or not
1108                 // Delete if changing from redirect to non-redirect
1109                 $isRedirect = !is_null( $redirectTitle );
1110
1111                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1112                         return true;
1113                 }
1114
1115                 wfProfileIn( __METHOD__ );
1116                 if ( $isRedirect ) {
1117                         $this->insertRedirectEntry( $redirectTitle );
1118                 } else {
1119                         // This is not a redirect, remove row from redirect table
1120                         $where = array( 'rd_from' => $this->getId() );
1121                         $dbw->delete( 'redirect', $where, __METHOD__ );
1122                 }
1123
1124                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1125                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1126                 }
1127                 wfProfileOut( __METHOD__ );
1128
1129                 return ( $dbw->affectedRows() != 0 );
1130         }
1131
1132         /**
1133          * If the given revision is newer than the currently set page_latest,
1134          * update the page record. Otherwise, do nothing.
1135          *
1136          * @param $dbw DatabaseBase object
1137          * @param $revision Revision object
1138          * @return mixed
1139          */
1140         public function updateIfNewerOn( $dbw, $revision ) {
1141                 wfProfileIn( __METHOD__ );
1142
1143                 $row = $dbw->selectRow(
1144                         array( 'revision', 'page' ),
1145                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1146                         array(
1147                                 'page_id' => $this->getId(),
1148                                 'page_latest=rev_id' ),
1149                         __METHOD__ );
1150
1151                 if ( $row ) {
1152                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1153                                 wfProfileOut( __METHOD__ );
1154                                 return false;
1155                         }
1156                         $prev = $row->rev_id;
1157                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1158                 } else {
1159                         # No or missing previous revision; mark the page as new
1160                         $prev = 0;
1161                         $lastRevIsRedirect = null;
1162                 }
1163
1164                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1165
1166                 wfProfileOut( __METHOD__ );
1167                 return $ret;
1168         }
1169
1170         /**
1171          * Get the text that needs to be saved in order to undo all revisions
1172          * between $undo and $undoafter. Revisions must belong to the same page,
1173          * must exist and must not be deleted
1174          * @param $undo Revision
1175          * @param $undoafter Revision Must be an earlier revision than $undo
1176          * @return mixed string on success, false on failure
1177          * @deprecated since 1.WD: use ContentHandler::getUndoContent() instead.
1178          */
1179         public function getUndoText( Revision $undo, Revision $undoafter = null ) { #FIXME: replace usages.
1180                 wfDeprecated( __METHOD__, '1.WD' );
1181
1182                 $this->loadLastEdit();
1183
1184                 if ( $this->mLastRevision ) {
1185                         if ( is_null( $undoafter ) ) {
1186                                 $undoafter = $undo->getPrevious();
1187                         }
1188
1189                         $handler = $this->getContentHandler();
1190                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1191
1192                         if ( !$undone ) {
1193                                 return false;
1194                         } else {
1195                                 return ContentHandler::getContentText( $undone );
1196                         }
1197                 }
1198
1199                 return false;
1200         }
1201
1202         /**
1203          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1204          * @param $text String: new text of the section
1205          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1206          * @param $edittime String: revision timestamp or null to use the current revision
1207          * @return String new complete article text, or null if error
1208          *
1209          * @deprecated since 1.WD, use replaceSectionContent() instead
1210          */
1211         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) { #FIXME: use replaceSectionContent() instead!
1212         wfDeprecated( __METHOD__, '1.WD' );
1213
1214         $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() ); #XXX: could make section title, but that's not required.
1215
1216         $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1217
1218                 return ContentHandler::getContentText( $newContent ); #XXX: unclear what will happen for non-wikitext!
1219         }
1220
1221         /**
1222          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1223          * @param $content Content: new content of the section
1224          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1225          * @param $edittime String: revision timestamp or null to use the current revision
1226          *
1227          * @return Content new complete article content, or null if error
1228          *
1229          * @since 1.WD
1230          */
1231     public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1232         wfProfileIn( __METHOD__ );
1233
1234         if ( strval( $section ) == '' ) {
1235             // Whole-page edit; let the whole text through
1236             $newContent = $sectionContent;
1237         } else {
1238             // Bug 30711: always use current version when adding a new section
1239             if ( is_null( $edittime ) || $section == 'new' ) {
1240                 $oldContent = $this->getContent();
1241                 if ( ! $oldContent ) {
1242                     wfDebug( __METHOD__ . ": no page text\n" );
1243                     wfProfileOut( __METHOD__ );
1244                     return null;
1245                 }
1246             } else {
1247                 $dbw = wfGetDB( DB_MASTER );
1248                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1249
1250                 if ( !$rev ) {
1251                     wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1252                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1253                     wfProfileOut( __METHOD__ );
1254                     return null;
1255                 }
1256
1257                 $oldContent = $rev->getContent();
1258             }
1259
1260             $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1261         }
1262
1263         wfProfileOut( __METHOD__ );
1264         return $newContent;
1265     }
1266
1267         /**
1268          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1269          * @param $flags Int
1270          * @return Int updated $flags
1271          */
1272         function checkFlags( $flags ) {
1273                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1274                         if ( $this->mTitle->getArticleID() ) {
1275                                 $flags |= EDIT_UPDATE;
1276                         } else {
1277                                 $flags |= EDIT_NEW;
1278                         }
1279                 }
1280
1281                 return $flags;
1282         }
1283
1284         /**
1285          * Change an existing article or create a new article. Updates RC and all necessary caches,
1286          * optionally via the deferred update array.
1287          *
1288          * @param $text String: new text
1289          * @param $summary String: edit summary
1290          * @param $flags Integer bitfield:
1291          *      EDIT_NEW
1292          *          Article is known or assumed to be non-existent, create a new one
1293          *      EDIT_UPDATE
1294          *          Article is known or assumed to be pre-existing, update it
1295          *      EDIT_MINOR
1296          *          Mark this edit minor, if the user is allowed to do so
1297          *      EDIT_SUPPRESS_RC
1298          *          Do not log the change in recentchanges
1299          *      EDIT_FORCE_BOT
1300          *          Mark the edit a "bot" edit regardless of user rights
1301          *      EDIT_DEFER_UPDATES
1302          *          Defer some of the updates until the end of index.php
1303          *      EDIT_AUTOSUMMARY
1304          *          Fill in blank summaries with generated text where possible
1305          *
1306          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1307          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1308          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1309          * edit-already-exists error will be returned. These two conditions are also possible with
1310          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1311          *
1312          * @param $baseRevId int the revision ID this edit was based off, if any
1313          * @param $user User the user doing the edit
1314          *
1315          * @return Status object. Possible errors:
1316          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1317          *     edit-gone-missing:       In update mode, but the article didn't exist
1318          *     edit-conflict:           In update mode, the article changed unexpectedly
1319          *     edit-no-change:          Warning that the text was the same as before
1320          *     edit-already-exists:     In creation mode, but the article already exists
1321          *
1322          *  Extensions may define additional errors.
1323          *
1324          *  $return->value will contain an associative array with members as follows:
1325          *     new:                     Boolean indicating if the function attempted to create a new article
1326          *     revision:                The revision object for the inserted revision, or null
1327          *
1328          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1329          *
1330          * @deprecated since 1.WD: use doEditContent() instead.
1331          */
1332     public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) { #FIXME: use doEditContent() instead
1333         wfDeprecated( __METHOD__, '1.WD' );
1334
1335         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1336
1337         return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1338     }
1339
1340     /**
1341      * Change an existing article or create a new article. Updates RC and all necessary caches,
1342      * optionally via the deferred update array.
1343      *
1344      * @param $content Content: new content
1345      * @param $summary String: edit summary
1346      * @param $flags Integer bitfield:
1347      *      EDIT_NEW
1348      *          Article is known or assumed to be non-existent, create a new one
1349      *      EDIT_UPDATE
1350      *          Article is known or assumed to be pre-existing, update it
1351      *      EDIT_MINOR
1352      *          Mark this edit minor, if the user is allowed to do so
1353      *      EDIT_SUPPRESS_RC
1354      *          Do not log the change in recentchanges
1355      *      EDIT_FORCE_BOT
1356      *          Mark the edit a "bot" edit regardless of user rights
1357      *      EDIT_DEFER_UPDATES
1358      *          Defer some of the updates until the end of index.php
1359      *      EDIT_AUTOSUMMARY
1360      *          Fill in blank summaries with generated text where possible
1361      *
1362      * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1363      * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1364      * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1365      * edit-already-exists error will be returned. These two conditions are also possible with
1366      * auto-detection due to MediaWiki's performance-optimised locking strategy.
1367      *
1368      * @param $baseRevId the revision ID this edit was based off, if any
1369      * @param $user User the user doing the edit
1370      * @param $serialisation_format String: format for storing the content in the database
1371      *
1372      * @return Status object. Possible errors:
1373      *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1374      *     edit-gone-missing:       In update mode, but the article didn't exist
1375      *     edit-conflict:           In update mode, the article changed unexpectedly
1376      *     edit-no-change:          Warning that the text was the same as before
1377      *     edit-already-exists:     In creation mode, but the article already exists
1378      *
1379      *  Extensions may define additional errors.
1380      *
1381      *  $return->value will contain an associative array with members as follows:
1382      *     new:                     Boolean indicating if the function attempted to create a new article
1383      *     revision:                The revision object for the inserted revision, or null
1384      *
1385      * @since 1.WD
1386      */
1387         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1388                                    User $user = null, $serialisation_format = null ) { #FIXME: use this
1389                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1390
1391                 # Low-level sanity check
1392                 if ( $this->mTitle->getText() === '' ) {
1393                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1394                 }
1395
1396                 wfProfileIn( __METHOD__ );
1397
1398                 $user = is_null( $user ) ? $wgUser : $user;
1399                 $status = Status::newGood( array() );
1400
1401                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1402                 $this->loadPageData( 'fromdbmaster' );
1403
1404                 $flags = $this->checkFlags( $flags );
1405
1406         # call legacy hook
1407         $hook_ok = wfRunHooks( 'ArticleContentSave', array( &$this, &$user, &$content, &$summary, #FIXME: document new hook!
1408             $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1409
1410         if ( $hook_ok && !empty( $wgHooks['ArticleSave'] ) ) { # avoid serialization overhead if the hook isn't present
1411             $content_text = $content->serialize();
1412             $txt = $content_text; # clone
1413
1414             $hook_ok = wfRunHooks( 'ArticleSave', array( &$this, &$user, &$txt, &$summary, #FIXME: deprecate legacy hook!
1415                 $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1416
1417             if ( $txt !== $content_text ) {
1418                 # if the text changed, unserialize the new version to create an updated Content object.
1419                 $content = $content->getContentHandler()->unserializeContent( $txt );
1420             }
1421         }
1422
1423                 if ( !$hook_ok ) {
1424                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1425
1426                         if ( $status->isOK() ) {
1427                                 $status->fatal( 'edit-hook-aborted' );
1428                         }
1429
1430                         wfProfileOut( __METHOD__ );
1431                         return $status;
1432                 }
1433
1434                 # Silently ignore EDIT_MINOR if not allowed
1435                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1436                 $bot = $flags & EDIT_FORCE_BOT;
1437
1438                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1439
1440                 $oldsize = $old_content ? $old_content->getSize() : 0;
1441                 $oldid = $this->getLatest();
1442                 $oldIsRedirect = $this->isRedirect();
1443                 $oldcountable = $this->isCountable();
1444
1445         $handler = $content->getContentHandler();
1446
1447                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1448                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1449             if ( !$old_content ) $old_content = null;
1450                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1451                 }
1452
1453                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1454                 $serialized = $editInfo->pst;
1455         $content = $editInfo->pstContent;
1456                 $newsize =  $content->getSize();
1457
1458                 $dbw = wfGetDB( DB_MASTER );
1459                 $now = wfTimestampNow();
1460                 $this->mTimestamp = $now;
1461
1462                 if ( $flags & EDIT_UPDATE ) {
1463                         # Update article, but only if changed.
1464                         $status->value['new'] = false;
1465
1466                         if ( !$oldid ) {
1467                                 # Article gone missing
1468                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1469                                 $status->fatal( 'edit-gone-missing' );
1470
1471                                 wfProfileOut( __METHOD__ );
1472                                 return $status;
1473                         }
1474
1475                         # Make sure the revision is either completely inserted or not inserted at all
1476                         if ( !$wgDBtransactions ) {
1477                                 $userAbort = ignore_user_abort( true );
1478                         }
1479
1480                         $revision = new Revision( array(
1481                                 'page'       => $this->getId(),
1482                                 'comment'    => $summary,
1483                                 'minor_edit' => $isminor,
1484                                 'text'       => $serialized,
1485                 'len'        => $newsize,
1486                                 'parent_id'  => $oldid,
1487                                 'user'       => $user->getId(),
1488                                 'user_text'  => $user->getName(),
1489                                 'timestamp'  => $now,
1490                 'content_model' => $content->getModelName(),
1491                 'content_format' => $serialisation_format,
1492                         ) );
1493
1494                         $changed = !$content->equals( $old_content );
1495
1496                         if ( $changed ) {
1497                                 $dbw->begin( __METHOD__ );
1498                                 $revisionId = $revision->insertOn( $dbw );
1499
1500                                 # Update page
1501                                 #
1502                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1503                                 # during the course of this function. This makes sure that EditPage can detect
1504                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1505                                 # before this function is called. A previous function used a separate query, this
1506                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1507                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1508
1509                                 if ( !$ok ) {
1510                                         /* Belated edit conflict! Run away!! */
1511                                         $status->fatal( 'edit-conflict' );
1512
1513                                         # Delete the invalid revision if the DB is not transactional
1514                                         if ( !$wgDBtransactions ) {
1515                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1516                                         }
1517
1518                                         $revisionId = 0;
1519                                         $dbw->rollback( __METHOD__ );
1520                                 } else {
1521                                         global $wgUseRCPatrol;
1522                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1523                                         # Update recentchanges
1524                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1525                                                 # Mark as patrolled if the user can do so
1526                                                 $patrolled = $wgUseRCPatrol && !count(
1527                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1528                                                 # Add RC row to the DB
1529                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1530                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1531                                                         $revisionId, $patrolled
1532                                                 );
1533
1534                                                 # Log auto-patrolled edits
1535                                                 if ( $patrolled ) {
1536                                                         PatrolLog::record( $rc, true, $user );
1537                                                 }
1538                                         }
1539                                         $user->incEditCount();
1540                                         $dbw->commit( __METHOD__ );
1541                                 }
1542                         } else {
1543                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1544                                 // related variables correctly
1545                                 $revision->setId( $this->getLatest() );
1546                         }
1547
1548                         if ( !$wgDBtransactions ) {
1549                                 ignore_user_abort( $userAbort );
1550                         }
1551
1552                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1553                         if ( !$status->isOK() ) {
1554                                 wfProfileOut( __METHOD__ );
1555                                 return $status;
1556                         }
1557
1558                         # Update links tables, site stats, etc.
1559                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1560                                 'oldcountable' => $oldcountable ) );
1561
1562                         if ( !$changed ) {
1563                                 $status->warning( 'edit-no-change' );
1564                                 $revision = null;
1565                                 // Update page_touched, this is usually implicit in the page update
1566                                 // Other cache updates are done in onArticleEdit()
1567                                 $this->mTitle->invalidateCache();
1568                         }
1569                 } else {
1570                         # Create new article
1571                         $status->value['new'] = true;
1572
1573                         $dbw->begin( __METHOD__ );
1574
1575                         # Add the page record; stake our claim on this title!
1576                         # This will return false if the article already exists
1577                         $newid = $this->insertOn( $dbw );
1578
1579                         if ( $newid === false ) {
1580                                 $dbw->rollback( __METHOD__ );
1581                                 $status->fatal( 'edit-already-exists' );
1582
1583                                 wfProfileOut( __METHOD__ );
1584                                 return $status;
1585                         }
1586
1587                         # Save the revision text...
1588                         $revision = new Revision( array(
1589                                 'page'       => $newid,
1590                                 'comment'    => $summary,
1591                                 'minor_edit' => $isminor,
1592                                 'text'       => $serialized,
1593                 'len'        => $newsize,
1594                                 'user'       => $user->getId(),
1595                                 'user_text'  => $user->getName(),
1596                                 'timestamp'  => $now,
1597                 'content_model' => $content->getModelName(),
1598                 'content_format' => $serialisation_format,
1599                         ) );
1600                         $revisionId = $revision->insertOn( $dbw );
1601
1602                         # Update the page record with revision data
1603                         $this->updateRevisionOn( $dbw, $revision, 0 );
1604
1605                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1606
1607                         # Update recentchanges
1608                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1609                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1610
1611                                 # Mark as patrolled if the user can do so
1612                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1613                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1614                                 # Add RC row to the DB
1615                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1616                                         '', $content->getSize(), $revisionId, $patrolled );
1617
1618                                 # Log auto-patrolled edits
1619                                 if ( $patrolled ) {
1620                                         PatrolLog::record( $rc, true, $user );
1621                                 }
1622                         }
1623                         $user->incEditCount();
1624                         $dbw->commit( __METHOD__ );
1625
1626                         # Update links, etc.
1627                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1628
1629                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $serialized, $summary, #FIXME: deprecate legacy hook
1630                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1631
1632             wfRunHooks( 'ArticleContentInsertComplete', array( &$this, &$user, $content, $summary, #FIXME: document new hook
1633                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1634                 }
1635
1636                 # Do updates right now unless deferral was requested
1637                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1638                         DeferredUpdates::doUpdates();
1639                 }
1640
1641                 // Return the new revision (or null) to the caller
1642                 $status->value['revision'] = $revision;
1643
1644                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $serialized, $summary,  #FIXME: deprecate legacy hook
1645                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1646
1647         wfRunHooks( 'ArticleContentSaveComplete', array( &$this, &$user, $content, $summary, #FIXME: document new hook
1648             $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1649
1650                 # Promote user to any groups they meet the criteria for
1651                 $user->addAutopromoteOnceGroups( 'onEdit' );
1652
1653                 wfProfileOut( __METHOD__ );
1654                 return $status;
1655         }
1656
1657         /**
1658          * Get parser options suitable for rendering the primary article wikitext
1659          * @param User|string $user User object or 'canonical'
1660          * @return ParserOptions
1661          */
1662         public function makeParserOptions( $user ) {
1663                 global $wgContLang;
1664                 if ( $user instanceof User ) { // settings per user (even anons)
1665                         $options = ParserOptions::newFromUser( $user );
1666                 } else { // canonical settings
1667                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1668                 }
1669                 $options->enableLimitReport(); // show inclusion/loop reports
1670                 $options->setTidy( true ); // fix bad HTML
1671                 return $options;
1672         }
1673
1674         /**
1675          * Prepare text which is about to be saved.
1676          * Returns a stdclass with source, pst and output members
1677          *
1678          * @deprecated in 1.WD: use prepareContentForEdit instead.
1679          */
1680     public function prepareTextForEdit( $text, $revid = null, User $user = null ) {  #FIXME: use prepareContentForEdit() instead #XXX: who uses this?!
1681         #TODO: log use of deprecated function
1682         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1683         return $this->prepareContentForEdit( $content, $revid , $user );
1684     }
1685
1686     /**
1687      * Prepare content which is about to be saved.
1688      * Returns a stdclass with source, pst and output members
1689      *
1690      * @param \Content $content
1691      * @param null $revid
1692      * @param null|\User $user
1693      * @param null $serialization_format
1694      *
1695      * @return bool|object
1696      *
1697      * @since 1.WD
1698      */
1699         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) { #FIXME: use this #XXX: really public?!
1700                 global $wgParser, $wgContLang, $wgUser;
1701                 $user = is_null( $user ) ? $wgUser : $user;
1702                 // @TODO fixme: check $user->getId() here???
1703
1704                 if ( $this->mPreparedEdit
1705                         && $this->mPreparedEdit->newContent
1706             && $this->mPreparedEdit->newContent->equals( $content )
1707                         && $this->mPreparedEdit->revid == $revid
1708             && $this->mPreparedEdit->format == $serialization_format
1709             #XXX: also check $user here?
1710                 ) {
1711                         // Already prepared
1712                         return $this->mPreparedEdit;
1713                 }
1714
1715                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1716                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1717
1718                 $edit = (object)array();
1719                 $edit->revid = $revid;
1720
1721                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1722         $edit->pst = $edit->pstContent->serialize( $serialization_format );
1723         $edit->format = $serialization_format;
1724
1725                 $edit->popts = $this->makeParserOptions( 'canonical' );
1726
1727                 // TODO: is there no better way to obtain a context here?
1728                 $context = RequestContext::getMain();
1729                 $context->setTitle( $this->mTitle );
1730                 $edit->output = $edit->pstContent->getParserOutput( $context, $revid, $edit->popts );
1731
1732         $edit->newContent = $content;
1733                 $edit->oldContent = $this->getContent( Revision::RAW );
1734
1735         $edit->newText = ContentHandler::getContentText( $edit->newContent ); #FIXME: B/C only! don't use this field!
1736         $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : ''; #FIXME: B/C only! don't use this field!
1737
1738                 $this->mPreparedEdit = $edit;
1739
1740                 return $edit;
1741         }
1742
1743         /**
1744          * Do standard deferred updates after page edit.
1745          * Update links tables, site stats, search index and message cache.
1746          * Purges pages that include this page if the text was changed here.
1747          * Every 100th edit, prune the recent changes table.
1748          *
1749          * @param $revision Revision object
1750          * @param $user User object that did the revision
1751          * @param $options Array of options, following indexes are used:
1752          * - changed: boolean, whether the revision changed the content (default true)
1753          * - created: boolean, whether the revision created the page (default false)
1754          * - oldcountable: boolean or null (default null):
1755          *   - boolean: whether the page was counted as an article before that
1756          *     revision, only used in changed is true and created is false
1757          *   - null: don't change the article count
1758          */
1759         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1760                 global $wgEnableParserCache;
1761
1762                 wfProfileIn( __METHOD__ );
1763
1764                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1765         $content = $revision->getContent();
1766
1767                 # Parse the text
1768                 # Be careful not to double-PST: $text is usually already PST-ed once
1769                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1770                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1771                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
1772                 } else {
1773                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1774                         $editInfo = $this->mPreparedEdit;
1775                 }
1776
1777                 # Save it to the parser cache
1778                 if ( $wgEnableParserCache ) {
1779                         $parserCache = ParserCache::singleton();
1780                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1781                 }
1782
1783                 # Update the links tables and other secondary data
1784         $updates = $editInfo->output->getSecondaryDataUpdates( $this->mTitle );
1785         SecondaryDataUpdate::runUpdates( $updates );
1786
1787                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1788
1789                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1790                         if ( 0 == mt_rand( 0, 99 ) ) {
1791                                 // Flush old entries from the `recentchanges` table; we do this on
1792                                 // random requests so as to avoid an increase in writes for no good reason
1793                                 global $wgRCMaxAge;
1794
1795                                 $dbw = wfGetDB( DB_MASTER );
1796                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1797                                 $dbw->delete(
1798                                         'recentchanges',
1799                                         array( "rc_timestamp < '$cutoff'" ),
1800                                         __METHOD__
1801                                 );
1802                         }
1803                 }
1804
1805                 if ( !$this->mTitle->exists() ) {
1806                         wfProfileOut( __METHOD__ );
1807                         return;
1808                 }
1809
1810                 $id = $this->getId();
1811                 $title = $this->mTitle->getPrefixedDBkey();
1812                 $shortTitle = $this->mTitle->getDBkey();
1813
1814                 if ( !$options['changed'] ) {
1815                         $good = 0;
1816                         $total = 0;
1817                 } elseif ( $options['created'] ) {
1818                         $good = (int)$this->isCountable( $editInfo );
1819                         $total = 1;
1820                 } elseif ( $options['oldcountable'] !== null ) {
1821                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1822                         $total = 0;
1823                 } else {
1824                         $good = 0;
1825                         $total = 0;
1826                 }
1827
1828                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1829         DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) );
1830
1831                 # If this is another user's talk page, update newtalk.
1832                 # Don't do this if $options['changed'] = false (null-edits) nor if
1833                 # it's a minor edit and the user doesn't want notifications for those.
1834                 if ( $options['changed']
1835                         && $this->mTitle->getNamespace() == NS_USER_TALK
1836                         && $shortTitle != $user->getTitleKey()
1837                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1838                 ) {
1839                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1840                                 $other = User::newFromName( $shortTitle, false );
1841                                 if ( !$other ) {
1842                                         wfDebug( __METHOD__ . ": invalid username\n" );
1843                                 } elseif ( User::isIP( $shortTitle ) ) {
1844                                         // An anonymous user
1845                                         $other->setNewtalk( true );
1846                                 } elseif ( $other->isLoggedIn() ) {
1847                                         $other->setNewtalk( true );
1848                                 } else {
1849                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1850                                 }
1851                         }
1852                 }
1853
1854                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1855             $msgtext = ContentHandler::getContentText( $content ); #XXX: could skip pseudo-messages like js/css here, based on content model.
1856             if ( $msgtext === false || $msgtext === null ) $msgtext = '';
1857
1858                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
1859                 }
1860
1861                 if( $options['created'] ) {
1862                         self::onArticleCreate( $this->mTitle );
1863                 } else {
1864                         self::onArticleEdit( $this->mTitle );
1865                 }
1866
1867                 wfProfileOut( __METHOD__ );
1868         }
1869
1870         /**
1871          * Edit an article without doing all that other stuff
1872          * The article must already exist; link tables etc
1873          * are not updated, caches are not flushed.
1874          *
1875          * @param $text String: text submitted
1876          * @param $user User The relevant user
1877          * @param $comment String: comment submitted
1878          * @param $minor Boolean: whereas it's a minor modification
1879          *
1880          * @deprecated since 1.WD, use doEditContent() instead.
1881          */
1882     public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1883         wfDeprecated( __METHOD__, "1.WD" );
1884
1885         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1886         return $this->doQuickEditContent( $content, $user, $comment , $minor );
1887     }
1888
1889     /**
1890      * Edit an article without doing all that other stuff
1891      * The article must already exist; link tables etc
1892      * are not updated, caches are not flushed.
1893      *
1894      * @param $content Content: content submitted
1895      * @param $user User The relevant user
1896      * @param $comment String: comment submitted
1897      * @param $serialisation_format String: format for storing the content in the database
1898      * @param $minor Boolean: whereas it's a minor modification
1899      */
1900         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
1901                 wfProfileIn( __METHOD__ );
1902
1903         $serialized = $content->serialize( $serialisation_format );
1904
1905                 $dbw = wfGetDB( DB_MASTER );
1906                 $revision = new Revision( array(
1907                         'page'       => $this->getId(),
1908                         'text'       => $serialized,
1909             'length'     => $content->getSize(),
1910                         'comment'    => $comment,
1911                         'minor_edit' => $minor ? 1 : 0,
1912                 ) );
1913                 $revision->insertOn( $dbw );
1914                 $this->updateRevisionOn( $dbw, $revision );
1915
1916                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1917
1918                 wfProfileOut( __METHOD__ );
1919         }
1920
1921         /**
1922          * Update the article's restriction field, and leave a log entry.
1923          * This works for protection both existing and non-existing pages.
1924          *
1925          * @param $limit Array: set of restriction keys
1926          * @param $reason String
1927          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1928          * @param $expiry Array: per restriction type expiration
1929          * @param $user User The user updating the restrictions
1930          * @return bool true on success
1931          */
1932         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1933                 global $wgContLang;
1934
1935                 if ( wfReadOnly() ) {
1936                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1937                 }
1938
1939                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1940
1941                 $id = $this->mTitle->getArticleID();
1942
1943                 if ( !$cascade ) {
1944                         $cascade = false;
1945                 }
1946
1947                 // Take this opportunity to purge out expired restrictions
1948                 Title::purgeExpiredRestrictions();
1949
1950                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1951                 # we expect a single selection, but the schema allows otherwise.
1952                 $isProtected = false;
1953                 $protect = false;
1954                 $changed = false;
1955
1956                 $dbw = wfGetDB( DB_MASTER );
1957
1958                 foreach ( $restrictionTypes as $action ) {
1959                         if ( !isset( $expiry[$action] ) ) {
1960                                 $expiry[$action] = $dbw->getInfinity();
1961                         }
1962                         if ( !isset( $limit[$action] ) ) {
1963                                 $limit[$action] = '';
1964                         } elseif ( $limit[$action] != '' ) {
1965                                 $protect = true;
1966                         }
1967
1968                         # Get current restrictions on $action
1969                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1970                         if ( $current != '' ) {
1971                                 $isProtected = true;
1972                         }
1973
1974                         if ( $limit[$action] != $current ) {
1975                                 $changed = true;
1976                         } elseif ( $limit[$action] != '' ) {
1977                                 # Only check expiry change if the action is actually being
1978                                 # protected, since expiry does nothing on an not-protected
1979                                 # action.
1980                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1981                                         $changed = true;
1982                                 }
1983                         }
1984                 }
1985
1986                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1987                         $changed = true;
1988                 }
1989
1990                 # If nothing's changed, do nothing
1991                 if ( !$changed ) {
1992                         return Status::newGood();
1993                 }
1994
1995                 if ( !$protect ) { # No protection at all means unprotection
1996                         $revCommentMsg = 'unprotectedarticle';
1997                         $logAction = 'unprotect';
1998                 } elseif ( $isProtected ) {
1999                         $revCommentMsg = 'modifiedarticleprotection';
2000                         $logAction = 'modify';
2001                 } else {
2002                         $revCommentMsg = 'protectedarticle';
2003                         $logAction = 'protect';
2004                 }
2005
2006                 $encodedExpiry = array();
2007                 $protectDescription = '';
2008                 foreach ( $limit as $action => $restrictions ) {
2009                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2010                         if ( $restrictions != '' ) {
2011                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
2012                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2013                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
2014                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2015                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2016                                                 $wgContLang->time( $expiry[$action], false, false ) );
2017                                 } else {
2018                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
2019                                 }
2020
2021                                 $protectDescription .= ') ';
2022                         }
2023                 }
2024                 $protectDescription = trim( $protectDescription );
2025
2026                 if ( $id ) { # Protection of existing page
2027                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2028                                 return Status::newGood();
2029                         }
2030
2031                         # Only restrictions with the 'protect' right can cascade...
2032                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2033                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2034
2035                         # The schema allows multiple restrictions
2036                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2037                                 $cascade = false;
2038                         }
2039
2040                         # Update restrictions table
2041                         foreach ( $limit as $action => $restrictions ) {
2042                                 if ( $restrictions != '' ) {
2043                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2044                                                 array( 'pr_page' => $id,
2045                                                         'pr_type' => $action,
2046                                                         'pr_level' => $restrictions,
2047                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2048                                                         'pr_expiry' => $encodedExpiry[$action]
2049                                                 ),
2050                                                 __METHOD__
2051                                         );
2052                                 } else {
2053                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2054                                                 'pr_type' => $action ), __METHOD__ );
2055                                 }
2056                         }
2057
2058                         # Prepare a null revision to be added to the history
2059                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
2060                         if ( $reason ) {
2061                                 $editComment .= ": $reason";
2062                         }
2063                         if ( $protectDescription ) {
2064                                 $editComment .= " ($protectDescription)";
2065                         }
2066                         if ( $cascade ) {
2067                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2068                         }
2069
2070                         # Insert a null revision
2071                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2072                         $nullRevId = $nullRevision->insertOn( $dbw );
2073
2074                         $latest = $this->getLatest();
2075                         # Update page record
2076                         $dbw->update( 'page',
2077                                 array( /* SET */
2078                                         'page_touched' => $dbw->timestamp(),
2079                                         'page_restrictions' => '',
2080                                         'page_latest' => $nullRevId
2081                                 ), array( /* WHERE */
2082                                         'page_id' => $id
2083                                 ), __METHOD__
2084                         );
2085
2086                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2087                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2088                 } else { # Protection of non-existing page (also known as "title protection")
2089                         # Cascade protection is meaningless in this case
2090                         $cascade = false;
2091
2092                         if ( $limit['create'] != '' ) {
2093                                 $dbw->replace( 'protected_titles',
2094                                         array( array( 'pt_namespace', 'pt_title' ) ),
2095                                         array(
2096                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2097                                                 'pt_title' => $this->mTitle->getDBkey(),
2098                                                 'pt_create_perm' => $limit['create'],
2099                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2100                                                 'pt_expiry' => $encodedExpiry['create'],
2101                                                 'pt_user' => $user->getId(),
2102                                                 'pt_reason' => $reason,
2103                                         ), __METHOD__
2104                                 );
2105                         } else {
2106                                 $dbw->delete( 'protected_titles',
2107                                         array(
2108                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2109                                                 'pt_title' => $this->mTitle->getDBkey()
2110                                         ), __METHOD__
2111                                 );
2112                         }
2113                 }
2114
2115                 $this->mTitle->flushRestrictions();
2116
2117                 if ( $logAction == 'unprotect' ) {
2118                         $logParams = array();
2119                 } else {
2120                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2121                 }
2122
2123                 # Update the protection log
2124                 $log = new LogPage( 'protect' );
2125                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2126
2127                 return Status::newGood();
2128         }
2129
2130         /**
2131          * Take an array of page restrictions and flatten it to a string
2132          * suitable for insertion into the page_restrictions field.
2133          * @param $limit Array
2134          * @return String
2135          */
2136         protected static function flattenRestrictions( $limit ) {
2137                 if ( !is_array( $limit ) ) {
2138                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2139                 }
2140
2141                 $bits = array();
2142                 ksort( $limit );
2143
2144                 foreach ( $limit as $action => $restrictions ) {
2145                         if ( $restrictions != '' ) {
2146                                 $bits[] = "$action=$restrictions";
2147                         }
2148                 }
2149
2150                 return implode( ':', $bits );
2151         }
2152
2153         /**
2154          * Same as doDeleteArticleReal(), but returns more detailed success/failure status
2155          * Deletes the article with database consistency, writes logs, purges caches
2156          *
2157          * @param $reason string delete reason for deletion log
2158          * @param $suppress int bitfield
2159          *      Revision::DELETED_TEXT
2160          *      Revision::DELETED_COMMENT
2161          *      Revision::DELETED_USER
2162          *      Revision::DELETED_RESTRICTED
2163          * @param $id int article ID
2164          * @param $commit boolean defaults to true, triggers transaction end
2165          * @param &$error Array of errors to append to
2166          * @param $user User The deleting user
2167          * @return boolean true if successful
2168          */
2169         public function doDeleteArticle(
2170                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2171         ) {
2172                 return $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user )
2173                         == WikiPage::DELETE_SUCCESS;
2174         }
2175
2176         /**
2177          * Back-end article deletion
2178          * Deletes the article with database consistency, writes logs, purges caches
2179          *
2180          * @param $reason string delete reason for deletion log
2181          * @param $suppress int bitfield
2182          *      Revision::DELETED_TEXT
2183          *      Revision::DELETED_COMMENT
2184          *      Revision::DELETED_USER
2185          *      Revision::DELETED_RESTRICTED
2186          * @param $id int article ID
2187          * @param $commit boolean defaults to true, triggers transaction end
2188          * @param &$error Array of errors to append to
2189          * @param $user User The deleting user
2190          * @return int: One of WikiPage::DELETE_* constants
2191          */
2192         public function doDeleteArticleReal(
2193                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2194         ) {
2195                 global $wgUser;
2196                 $user = is_null( $user ) ? $wgUser : $user;
2197
2198                 wfDebug( __METHOD__ . "\n" );
2199
2200                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
2201                         return WikiPage::DELETE_HOOK_ABORTED;
2202                 }
2203                 $dbw = wfGetDB( DB_MASTER );
2204                 $t = $this->mTitle->getDBkey();
2205                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
2206
2207                 if ( $t === '' || $id == 0 ) {
2208                         return WikiPage::DELETE_NO_PAGE;
2209                 }
2210
2211                 // Bitfields to further suppress the content
2212                 if ( $suppress ) {
2213                         $bitfield = 0;
2214                         // This should be 15...
2215                         $bitfield |= Revision::DELETED_TEXT;
2216                         $bitfield |= Revision::DELETED_COMMENT;
2217                         $bitfield |= Revision::DELETED_USER;
2218                         $bitfield |= Revision::DELETED_RESTRICTED;
2219                 } else {
2220                         $bitfield = 'rev_deleted';
2221                 }
2222
2223                 $dbw->begin( __METHOD__ );
2224                 // For now, shunt the revision data into the archive table.
2225                 // Text is *not* removed from the text table; bulk storage
2226                 // is left intact to avoid breaking block-compression or
2227                 // immutable storage schemes.
2228                 //
2229                 // For backwards compatibility, note that some older archive
2230                 // table entries will have ar_text and ar_flags fields still.
2231                 //
2232                 // In the future, we may keep revisions and mark them with
2233                 // the rev_deleted field, which is reserved for this purpose.
2234                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2235                         array(
2236                                 'ar_namespace'  => 'page_namespace',
2237                                 'ar_title'      => 'page_title',
2238                                 'ar_comment'    => 'rev_comment',
2239                                 'ar_user'       => 'rev_user',
2240                                 'ar_user_text'  => 'rev_user_text',
2241                                 'ar_timestamp'  => 'rev_timestamp',
2242                                 'ar_minor_edit' => 'rev_minor_edit',
2243                                 'ar_rev_id'     => 'rev_id',
2244                                 'ar_parent_id'  => 'rev_parent_id',
2245                                 'ar_text_id'    => 'rev_text_id',
2246                                 'ar_text'       => '\'\'', // Be explicit to appease
2247                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2248                                 'ar_len'        => 'rev_len',
2249                                 'ar_page_id'    => 'page_id',
2250                                 'ar_deleted'    => $bitfield,
2251                                 'ar_sha1'       => 'rev_content_model',
2252                                 'ar_content_format'       => 'rev_content_format',
2253                                 'ar_content_format'       => 'rev_sha1'
2254                         ), array(
2255                                 'page_id' => $id,
2256                                 'page_id = rev_page'
2257                         ), __METHOD__
2258                 );
2259
2260                 # Now that it's safely backed up, delete it
2261                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2262                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2263
2264                 if ( !$ok ) {
2265                         $dbw->rollback( __METHOD__ );
2266                         return WikiPage::DELETE_NO_REVISIONS;
2267                 }
2268
2269                 $this->doDeleteUpdates( $id );
2270
2271                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2272                 $logtype = $suppress ? 'suppress' : 'delete';
2273
2274                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2275                 $logEntry->setPerformer( $user );
2276                 $logEntry->setTarget( $this->mTitle );
2277                 $logEntry->setComment( $reason );
2278                 $logid = $logEntry->insert();
2279                 $logEntry->publish( $logid );
2280
2281                 if ( $commit ) {
2282                         $dbw->commit( __METHOD__ );
2283                 }
2284
2285                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2286                 return WikiPage::DELETE_SUCCESS;
2287         }
2288
2289         /**
2290          * Do some database updates after deletion
2291          *
2292          * @param $id Int: page_id value of the page being deleted
2293          */
2294         public function doDeleteUpdates( $id ) {
2295                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2296
2297                 $dbw = wfGetDB( DB_MASTER );
2298
2299                 # Delete restrictions for it
2300                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2301
2302                 # Fix category table counts
2303                 $cats = array();
2304                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2305
2306                 foreach ( $res as $row ) {
2307                         $cats [] = $row->cl_to;
2308                 }
2309
2310                 $this->updateCategoryCounts( array(), $cats );
2311
2312         #TODO: move this to an Update object!
2313
2314                 # If using cascading deletes, we can skip some explicit deletes
2315                 if ( !$dbw->cascadingDeletes() ) {
2316                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2317
2318                         # Delete outgoing links
2319                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
2320                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
2321                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
2322                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
2323                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
2324                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
2325                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
2326                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
2327                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
2328                 }
2329
2330                 # If using cleanup triggers, we can skip some manual deletes
2331                 if ( !$dbw->cleanupTriggers() ) {
2332                         # Clean up recentchanges entries...
2333                         $dbw->delete( 'recentchanges',
2334                                 array( 'rc_type != ' . RC_LOG,
2335                                         'rc_namespace' => $this->mTitle->getNamespace(),
2336                                         'rc_title' => $this->mTitle->getDBkey() ),
2337                                 __METHOD__ );
2338                         $dbw->delete( 'recentchanges',
2339                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2340                                 __METHOD__ );
2341                 }
2342
2343                 # Clear caches
2344                 self::onArticleDelete( $this->mTitle );
2345
2346                 # Reset this object
2347                 $this->clear();
2348
2349                 # Clear the cached article id so the interface doesn't act like we exist
2350                 $this->mTitle->resetArticleID( 0 );
2351         }
2352
2353         /**
2354          * Roll back the most recent consecutive set of edits to a page
2355          * from the same user; fails if there are no eligible edits to
2356          * roll back to, e.g. user is the sole contributor. This function
2357          * performs permissions checks on $user, then calls commitRollback()
2358          * to do the dirty work
2359          *
2360          * @todo: seperate the business/permission stuff out from backend code
2361          *
2362          * @param $fromP String: Name of the user whose edits to rollback.
2363          * @param $summary String: Custom summary. Set to default summary if empty.
2364          * @param $token String: Rollback token.
2365          * @param $bot Boolean: If true, mark all reverted edits as bot.
2366          *
2367          * @param $resultDetails Array: contains result-specific array of additional values
2368          *    'alreadyrolled' : 'current' (rev)
2369          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2370          *
2371          * @param $user User The user performing the rollback
2372          * @return array of errors, each error formatted as
2373          *   array(messagekey, param1, param2, ...).
2374          * On success, the array is empty.  This array can also be passed to
2375          * OutputPage::showPermissionsErrorPage().
2376          */
2377         public function doRollback(
2378                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2379         ) {
2380                 $resultDetails = null;
2381
2382                 # Check permissions
2383                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2384                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2385                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2386
2387                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2388                         $errors[] = array( 'sessionfailure' );
2389                 }
2390
2391                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2392                         $errors[] = array( 'actionthrottledtext' );
2393                 }
2394
2395                 # If there were errors, bail out now
2396                 if ( !empty( $errors ) ) {
2397                         return $errors;
2398                 }
2399
2400                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2401         }
2402
2403         /**
2404          * Backend implementation of doRollback(), please refer there for parameter
2405          * and return value documentation
2406          *
2407          * NOTE: This function does NOT check ANY permissions, it just commits the
2408          * rollback to the DB. Therefore, you should only call this function direct-
2409          * ly if you want to use custom permissions checks. If you don't, use
2410          * doRollback() instead.
2411          * @param $fromP String: Name of the user whose edits to rollback.
2412          * @param $summary String: Custom summary. Set to default summary if empty.
2413          * @param $bot Boolean: If true, mark all reverted edits as bot.
2414          *
2415          * @param $resultDetails Array: contains result-specific array of additional values
2416          * @param $guser User The user performing the rollback
2417          * @return array
2418          */
2419         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2420                 global $wgUseRCPatrol, $wgContLang;
2421
2422                 $dbw = wfGetDB( DB_MASTER );
2423
2424                 if ( wfReadOnly() ) {
2425                         return array( array( 'readonlytext' ) );
2426                 }
2427
2428                 # Get the last editor
2429                 $current = $this->getRevision();
2430                 if ( is_null( $current ) ) {
2431                         # Something wrong... no page?
2432                         return array( array( 'notanarticle' ) );
2433                 }
2434
2435                 $from = str_replace( '_', ' ', $fromP );
2436                 # User name given should match up with the top revision.
2437                 # If the user was deleted then $from should be empty.
2438                 if ( $from != $current->getUserText() ) {
2439                         $resultDetails = array( 'current' => $current );
2440                         return array( array( 'alreadyrolled',
2441                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2442                                 htmlspecialchars( $fromP ),
2443                                 htmlspecialchars( $current->getUserText() )
2444                         ) );
2445                 }
2446
2447                 # Get the last edit not by this guy...
2448                 # Note: these may not be public values
2449                 $user = intval( $current->getRawUser() );
2450                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2451                 $s = $dbw->selectRow( 'revision',
2452                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2453                         array( 'rev_page' => $current->getPage(),
2454                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2455                         ), __METHOD__,
2456                         array( 'USE INDEX' => 'page_timestamp',
2457                                 'ORDER BY' => 'rev_timestamp DESC' )
2458                         );
2459                 if ( $s === false ) {
2460                         # No one else ever edited this page
2461                         return array( array( 'cantrollback' ) );
2462                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2463                         # Only admins can see this text
2464                         return array( array( 'notvisiblerev' ) );
2465                 }
2466
2467                 $set = array();
2468                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2469                         # Mark all reverted edits as bot
2470                         $set['rc_bot'] = 1;
2471                 }
2472
2473                 if ( $wgUseRCPatrol ) {
2474                         # Mark all reverted edits as patrolled
2475                         $set['rc_patrolled'] = 1;
2476                 }
2477
2478                 if ( count( $set ) ) {
2479                         $dbw->update( 'recentchanges', $set,
2480                                 array( /* WHERE */
2481                                         'rc_cur_id' => $current->getPage(),
2482                                         'rc_user_text' => $current->getUserText(),
2483                                         "rc_timestamp > '{$s->rev_timestamp}'",
2484                                 ), __METHOD__
2485                         );
2486                 }
2487
2488                 # Generate the edit summary if necessary
2489                 $target = Revision::newFromId( $s->rev_id );
2490                 if ( empty( $summary ) ) {
2491                         if ( $from == '' ) { // no public user name
2492                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2493                         } else {
2494                                 $summary = wfMsgForContent( 'revertpage' );
2495                         }
2496                 }
2497
2498                 # Allow the custom summary to use the same args as the default message
2499                 $args = array(
2500                         $target->getUserText(), $from, $s->rev_id,
2501                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2502                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2503                 );
2504                 $summary = wfMsgReplaceArgs( $summary, $args );
2505
2506                 # Save
2507                 $flags = EDIT_UPDATE;
2508
2509                 if ( $guser->isAllowed( 'minoredit' ) ) {
2510                         $flags |= EDIT_MINOR;
2511                 }
2512
2513                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2514                         $flags |= EDIT_FORCE_BOT;
2515                 }
2516
2517                 # Actually store the edit
2518                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2519                 if ( !empty( $status->value['revision'] ) ) {
2520                         $revId = $status->value['revision']->getId();
2521                 } else {
2522                         $revId = false;
2523                 }
2524
2525                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2526
2527                 $resultDetails = array(
2528                         'summary' => $summary,
2529                         'current' => $current,
2530                         'target'  => $target,
2531                         'newid'   => $revId
2532                 );
2533
2534                 return array();
2535         }
2536
2537         /**
2538          * The onArticle*() functions are supposed to be a kind of hooks
2539          * which should be called whenever any of the specified actions
2540          * are done.
2541          *
2542          * This is a good place to put code to clear caches, for instance.
2543          *
2544          * This is called on page move and undelete, as well as edit
2545          *
2546          * @param $title Title object
2547          */
2548         public static function onArticleCreate( $title ) {
2549                 # Update existence markers on article/talk tabs...
2550                 if ( $title->isTalkPage() ) {
2551                         $other = $title->getSubjectPage();
2552                 } else {
2553                         $other = $title->getTalkPage();
2554                 }
2555
2556                 $other->invalidateCache();
2557                 $other->purgeSquid();
2558
2559                 $title->touchLinks();
2560                 $title->purgeSquid();
2561                 $title->deleteTitleProtection();
2562         }
2563
2564         /**
2565          * Clears caches when article is deleted
2566          *
2567          * @param $title Title
2568          */
2569         public static function onArticleDelete( $title ) {
2570                 # Update existence markers on article/talk tabs...
2571                 if ( $title->isTalkPage() ) {
2572                         $other = $title->getSubjectPage();
2573                 } else {
2574                         $other = $title->getTalkPage();
2575                 }
2576
2577                 $other->invalidateCache();
2578                 $other->purgeSquid();
2579
2580                 $title->touchLinks();
2581                 $title->purgeSquid();
2582
2583                 # File cache
2584                 HTMLFileCache::clearFileCache( $title );
2585
2586                 # Messages
2587                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2588                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2589                 }
2590
2591                 # Images
2592                 if ( $title->getNamespace() == NS_FILE ) {
2593                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2594                         $update->doUpdate();
2595                 }
2596
2597                 # User talk pages
2598                 if ( $title->getNamespace() == NS_USER_TALK ) {
2599                         $user = User::newFromName( $title->getText(), false );
2600                         if ( $user ) {
2601                                 $user->setNewtalk( false );
2602                         }
2603                 }
2604
2605                 # Image redirects
2606                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2607         }
2608
2609         /**
2610          * Purge caches on page update etc
2611          *
2612          * @param $title Title object
2613          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2614          */
2615         public static function onArticleEdit( $title ) {
2616                 // Invalidate caches of articles which include this page
2617                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2618
2619
2620                 // Invalidate the caches of all pages which redirect here
2621                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2622
2623                 # Purge squid for this page only
2624                 $title->purgeSquid();
2625
2626                 # Clear file cache for this page only
2627                 HTMLFileCache::clearFileCache( $title );
2628         }
2629
2630         /**#@-*/
2631
2632         /**
2633          * Returns a list of hidden categories this page is a member of.
2634          * Uses the page_props and categorylinks tables.
2635          *
2636          * @return Array of Title objects
2637          */
2638         public function getHiddenCategories() {
2639                 $result = array();
2640                 $id = $this->mTitle->getArticleID();
2641
2642                 if ( $id == 0 ) {
2643                         return array();
2644                 }
2645
2646                 $dbr = wfGetDB( DB_SLAVE );
2647                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2648                         array( 'cl_to' ),
2649                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2650                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2651                         __METHOD__ );
2652
2653                 if ( $res !== false ) {
2654                         foreach ( $res as $row ) {
2655                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2656                         }
2657                 }
2658
2659                 return $result;
2660         }
2661
2662         /**
2663         * Return an applicable autosummary if one exists for the given edit.
2664         * @param $oldtext String|null: the previous text of the page.
2665         * @param $newtext String|null: The submitted text of the page.
2666         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2667         * @return string An appropriate autosummary, or an empty string.
2668     * @deprecated since 1.WD, use ContentHandler::getAutosummary() instead
2669         */
2670         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2671                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2672
2673                 wfDeprecated( __METHOD__, '1.WD' );
2674
2675         $handler = ContentHandler::getForModelName( CONTENT_MODEL_WIKITEXT );
2676         $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2677         $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
2678
2679         return $handler->getAutosummary( $oldContent, $newContent, $flags );
2680         }
2681
2682         /**
2683          * Auto-generates a deletion reason
2684          *
2685          * @param &$hasHistory Boolean: whether the page has a history
2686          * @return mixed String containing deletion reason or empty string, or boolean false
2687          *    if no revision occurred
2688      * @deprecated since 1.WD, use ContentHandler::getAutoDeleteReason() instead
2689          */
2690         public function getAutoDeleteReason( &$hasHistory ) {
2691         #NOTE: stub for backwards-compatibility.
2692
2693                 wfDeprecated( __METHOD__, '1.WD' );
2694
2695                 $handler = ContentHandler::getForTitle( $this->getTitle() );
2696         $handler->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2697                 global $wgContLang;
2698
2699                 // Get the last revision
2700                 $rev = $this->getRevision();
2701
2702                 if ( is_null( $rev ) ) {
2703                         return false;
2704                 }
2705
2706                 // Get the article's contents
2707                 $contents = $rev->getText();
2708                 $blank = false;
2709
2710                 // If the page is blank, use the text from the previous revision,
2711                 // which can only be blank if there's a move/import/protect dummy revision involved
2712                 if ( $contents == '' ) {
2713                         $prev = $rev->getPrevious();
2714
2715                         if ( $prev )    {
2716                                 $contents = $prev->getText();
2717                                 $blank = true;
2718                         }
2719                 }
2720
2721                 $dbw = wfGetDB( DB_MASTER );
2722
2723                 // Find out if there was only one contributor
2724                 // Only scan the last 20 revisions
2725                 $res = $dbw->select( 'revision', 'rev_user_text',
2726                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2727                         __METHOD__,
2728                         array( 'LIMIT' => 20 )
2729                 );
2730
2731                 if ( $res === false ) {
2732                         // This page has no revisions, which is very weird
2733                         return false;
2734                 }
2735
2736                 $hasHistory = ( $res->numRows() > 1 );
2737                 $row = $dbw->fetchObject( $res );
2738
2739                 if ( $row ) { // $row is false if the only contributor is hidden
2740                         $onlyAuthor = $row->rev_user_text;
2741                         // Try to find a second contributor
2742                         foreach ( $res as $row ) {
2743                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2744                                         $onlyAuthor = false;
2745                                         break;
2746                                 }
2747                         }
2748                 } else {
2749                         $onlyAuthor = false;
2750                 }
2751
2752                 // Generate the summary with a '$1' placeholder
2753                 if ( $blank ) {
2754                         // The current revision is blank and the one before is also
2755                         // blank. It's just not our lucky day
2756                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2757                 } else {
2758                         if ( $onlyAuthor ) {
2759                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2760                         } else {
2761                                 $reason = wfMsgForContent( 'excontent', '$1' );
2762                         }
2763                 }
2764
2765                 if ( $reason == '-' ) {
2766                         // Allow these UI messages to be blanked out cleanly
2767                         return '';
2768                 }
2769
2770                 // Replace newlines with spaces to prevent uglyness
2771                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2772                 // Calculate the maximum amount of chars to get
2773                 // Max content length = max comment length - length of the comment (excl. $1)
2774                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2775                 $contents = $wgContLang->truncate( $contents, $maxLength );
2776                 // Remove possible unfinished links
2777                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2778                 // Now replace the '$1' placeholder
2779                 $reason = str_replace( '$1', $contents, $reason );
2780
2781                 return $reason;
2782         }
2783
2784         /**
2785          * Update all the appropriate counts in the category table, given that
2786          * we've added the categories $added and deleted the categories $deleted.
2787          *
2788          * @param $added array   The names of categories that were added
2789          * @param $deleted array The names of categories that were deleted
2790          */
2791         public function updateCategoryCounts( $added, $deleted ) {
2792                 $ns = $this->mTitle->getNamespace();
2793                 $dbw = wfGetDB( DB_MASTER );
2794
2795                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2796                 # exist, we might legitimately not create it, but it's simpler to just
2797                 # create it and then give it a negative value, since the value is bogus
2798                 # anyway.
2799                 #
2800                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2801                 $insertCats = array_merge( $added, $deleted );
2802                 if ( !$insertCats ) {
2803                         # Okay, nothing to do
2804                         return;
2805                 }
2806
2807                 $insertRows = array();
2808
2809                 foreach ( $insertCats as $cat ) {
2810                         $insertRows[] = array(
2811                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2812                                 'cat_title' => $cat
2813                         );
2814                 }
2815                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2816
2817                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2818                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2819
2820                 if ( $ns == NS_CATEGORY ) {
2821                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2822                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2823                 } elseif ( $ns == NS_FILE ) {
2824                         $addFields[]    = 'cat_files = cat_files + 1';
2825                         $removeFields[] = 'cat_files = cat_files - 1';
2826                 }
2827
2828                 if ( $added ) {
2829                         $dbw->update(
2830                                 'category',
2831                                 $addFields,
2832                                 array( 'cat_title' => $added ),
2833                                 __METHOD__
2834                         );
2835                 }
2836
2837                 if ( $deleted ) {
2838                         $dbw->update(
2839                                 'category',
2840                                 $removeFields,
2841                                 array( 'cat_title' => $deleted ),
2842                                 __METHOD__
2843                         );
2844                 }
2845         }
2846
2847         /**
2848          * Updates cascading protections
2849          *
2850          * @param $parserOutput ParserOutput object for the current version
2851          */
2852         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2853                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2854                         return;
2855                 }
2856
2857                 // templatelinks table may have become out of sync,
2858                 // especially if using variable-based transclusions.
2859                 // For paranoia, check if things have changed and if
2860                 // so apply updates to the database. This will ensure
2861                 // that cascaded protections apply as soon as the changes
2862                 // are visible.
2863
2864                 # Get templates from templatelinks
2865                 $id = $this->mTitle->getArticleID();
2866
2867                 $tlTemplates = array();
2868
2869                 $dbr = wfGetDB( DB_SLAVE );
2870                 $res = $dbr->select( array( 'templatelinks' ),
2871                         array( 'tl_namespace', 'tl_title' ),
2872                         array( 'tl_from' => $id ),
2873                         __METHOD__
2874                 );
2875
2876                 foreach ( $res as $row ) {
2877                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2878                 }
2879
2880                 # Get templates from parser output.
2881                 $poTemplates = array();
2882                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2883                         foreach ( $templates as $dbk => $id ) {
2884                                 $poTemplates["$ns:$dbk"] = true;
2885                         }
2886                 }
2887
2888                 # Get the diff
2889                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2890
2891                 if ( count( $templates_diff ) > 0 ) {
2892                         # Whee, link updates time.
2893             # Note: we are only interested in links here. We don't need to get other SecondaryDataUpdate items from the parser output.
2894                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2895                         $u->doUpdate();
2896                 }
2897         }
2898
2899         /**
2900          * Return a list of templates used by this article.
2901          * Uses the templatelinks table
2902          *
2903          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2904          * @return Array of Title objects
2905          */
2906         public function getUsedTemplates() {
2907                 return $this->mTitle->getTemplateLinksFrom();
2908         }
2909
2910         /**
2911          * Perform article updates on a special page creation.
2912          *
2913          * @param $rev Revision object
2914          *
2915          * @todo This is a shitty interface function. Kill it and replace the
2916          * other shitty functions like doEditUpdates and such so it's not needed
2917          * anymore.
2918          * @deprecated since 1.18, use doEditUpdates()
2919          */
2920         public function createUpdates( $rev ) {
2921                 wfDeprecated( __METHOD__, '1.18' );
2922                 global $wgUser;
2923                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2924         }
2925
2926         /**
2927          * This function is called right before saving the wikitext,
2928          * so we can do things like signatures and links-in-context.
2929          *
2930          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2931          * @param $text String article contents
2932          * @param $user User object: user doing the edit
2933          * @param $popts ParserOptions object: parser options, default options for
2934          *               the user loaded if null given
2935          * @return string article contents with altered wikitext markup (signatures
2936          *      converted, {{subst:}}, templates, etc.)
2937          */
2938         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2939                 global $wgParser, $wgUser;
2940
2941                 wfDeprecated( __METHOD__, '1.19' );
2942
2943                 $user = is_null( $user ) ? $wgUser : $user;
2944
2945                 if ( $popts === null ) {
2946                         $popts = ParserOptions::newFromUser( $user );
2947                 }
2948
2949                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2950         }
2951
2952         /**
2953          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2954          *
2955          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2956          * @return bool
2957          */
2958         public function isBigDeletion() {
2959                 wfDeprecated( __METHOD__, '1.19' );
2960                 return $this->mTitle->isBigDeletion();
2961         }
2962
2963         /**
2964          * Get the  approximate revision count of this page.
2965          *
2966          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2967          * @return int
2968          */
2969         public function estimateRevisionCount() {
2970                 wfDeprecated( __METHOD__, '1.19' );
2971                 return $this->mTitle->estimateRevisionCount();
2972         }
2973
2974         /**
2975          * Update the article's restriction field, and leave a log entry.
2976          *
2977          * @deprecated since 1.19
2978          * @param $limit Array: set of restriction keys
2979          * @param $reason String
2980          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2981          * @param $expiry Array: per restriction type expiration
2982          * @param $user User The user updating the restrictions
2983          * @return bool true on success
2984          */
2985         public function updateRestrictions(
2986                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2987         ) {
2988                 global $wgUser;
2989
2990                 $user = is_null( $user ) ? $wgUser : $user;
2991
2992                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2993         }
2994
2995         /**
2996          * @deprecated since 1.18
2997          */
2998         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2999                 wfDeprecated( __METHOD__, '1.18' );
3000                 global $wgUser;
3001                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3002         }
3003
3004         /**
3005          * @deprecated since 1.18
3006          */
3007         public function viewUpdates() {
3008                 wfDeprecated( __METHOD__, '1.18' );
3009                 global $wgUser;
3010                 return $this->doViewUpdates( $wgUser );
3011         }
3012
3013         /**
3014          * @deprecated since 1.18
3015          * @return bool
3016          */
3017         public function useParserCache( $oldid ) {
3018                 wfDeprecated( __METHOD__, '1.18' );
3019                 global $wgUser;
3020                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3021         }
3022 }
3023
3024 class PoolWorkArticleView extends PoolCounterWork {
3025
3026         /**
3027          * @var Page
3028          */
3029         private $page;
3030
3031         /**
3032          * @var string
3033          */
3034         private $cacheKey;
3035
3036         /**
3037          * @var integer
3038          */
3039         private $revid;
3040
3041         /**
3042          * @var ParserOptions
3043          */
3044         private $parserOptions;
3045
3046         /**
3047          * @var string|null
3048          */
3049         private $text;
3050
3051         /**
3052          * @var ParserOutput|bool
3053          */
3054         private $parserOutput = false;
3055
3056         /**
3057          * @var bool
3058          */
3059         private $isDirty = false;
3060
3061         /**
3062          * @var Status|bool
3063          */
3064         private $error = false;
3065
3066         /**
3067          * Constructor
3068          *
3069          * @param $page Page
3070          * @param $revid Integer: ID of the revision being parsed
3071          * @param $useParserCache Boolean: whether to use the parser cache
3072          * @param $parserOptions parserOptions to use for the parse operation
3073          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3074          * @param $context IContextSource context for parsing
3075          */
3076         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null, IContextSource $context = null ) {
3077         if ( is_string($content) ) { #BC: old style call
3078             $modelName = $page->getRevision()->getContentModelName();
3079             $format = $page->getRevision()->getContentFormat();
3080             $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelName, $format );
3081         }
3082
3083                 if ( is_null( $context ) ) {
3084                         $context = RequestContext::getMain();
3085                         #XXX: clone and then set title?
3086                 }
3087
3088                 $this->page = $page;
3089                 $this->revid = $revid;
3090                 $this->context = $context;
3091                 $this->cacheable = $useParserCache;
3092                 $this->parserOptions = $parserOptions;
3093                 $this->content = $content;
3094                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3095                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3096         }
3097
3098         /**
3099          * Get the ParserOutput from this object, or false in case of failure
3100          *
3101          * @return ParserOutput
3102          */
3103         public function getParserOutput() {
3104                 return $this->parserOutput;
3105         }
3106
3107         /**
3108          * Get whether the ParserOutput is a dirty one (i.e. expired)
3109          *
3110          * @return bool
3111          */
3112         public function getIsDirty() {
3113                 return $this->isDirty;
3114         }
3115
3116         /**
3117          * Get a Status object in case of error or false otherwise
3118          *
3119          * @return Status|bool
3120          */
3121         public function getError() {
3122                 return $this->error;
3123         }
3124
3125         /**
3126          * @return bool
3127          */
3128         function doWork() {
3129                 global $wgUseFileCache;
3130
3131                 // @todo: several of the methods called on $this->page are not declared in Page, but present in WikiPage and delegated by Article.
3132
3133                 $isCurrent = $this->revid === $this->page->getLatest();
3134
3135                 if ( $this->content !== null ) {
3136                         $content = $this->content;
3137                 } elseif ( $isCurrent ) {
3138             $content = $this->page->getContent( Revision::RAW ); #XXX: why use RAW audience here, and PUBLIC (default) below?
3139                 } else {
3140                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3141                         if ( $rev === null ) {
3142                                 return false;
3143                         }
3144             $content = $rev->getContent(); #XXX: why use PUBLIC audience here (default), and RAW above?
3145                 }
3146
3147                 $time = - microtime( true );
3148                 // TODO: page might not have this method? Hard to tell what page is supposed to be here...
3149                 $this->parserOutput = $content->getParserOutput( $this->context, $this->revid, $this->parserOptions );
3150                 $time += microtime( true );
3151
3152                 # Timing hack
3153                 if ( $time > 3 ) {
3154                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3155                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3156                 }
3157
3158                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3159                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3160                 }
3161
3162                 // Make sure file cache is not used on uncacheable content.
3163                 // Output that has magic words in it can still use the parser cache
3164                 // (if enabled), though it will generally expire sooner.
3165                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3166                         $wgUseFileCache = false;
3167                 }
3168
3169                 if ( $isCurrent ) {
3170                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3171                 }
3172
3173                 return true;
3174         }
3175
3176         /**
3177          * @return bool
3178          */
3179         function getCachedWork() {
3180                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3181
3182                 if ( $this->parserOutput === false ) {
3183                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3184                         return false;
3185                 } else {
3186                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3187                         return true;
3188                 }
3189         }
3190
3191         /**
3192          * @return bool
3193          */
3194         function fallback() {
3195                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3196
3197                 if ( $this->parserOutput === false ) {
3198                         wfDebugLog( 'dirty', "dirty missing\n" );
3199                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3200                         return false;
3201                 } else {
3202                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3203                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3204                         $this->isDirty = true;
3205                         return true;
3206                 }
3207         }
3208
3209         /**
3210          * @param $status Status
3211          * @return bool
3212          */
3213         function error( $status ) {
3214                 $this->error = $status;
3215                 return false;
3216         }
3217 }