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