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