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          * Get the title object of the article
 123          * @return Title object of this page
 124          */
 125         public function getTitle() {
 126                 return $this->mTitle;
 127         }
 128
 129         /**
 130          * Clear the object
 131          */
 132         public function clear() {
 133                 $this->mDataLoaded = false;
 134
 135                 $this->mCounter = null;
 136                 $this->mRedirectTarget = null; # Title object if set
 137                 $this->mLastRevision = null; # Latest revision
 138                 $this->mTouched = '19700101000000';
 139                 $this->mTimestamp = '';
 140                 $this->mIsRedirect = false;
 141                 $this->mLatest = false;
 142                 $this->mPreparedEdit = false;
 143         }
 144
 145         /**
 146          * Return the list of revision fields that should be selected to create
 147          * a new page.
 148          *
 149          * @return array
 150          */
 151         public static function selectFields() {
 152                 return array(
 153                         'page_id',
 154                         'page_namespace',
 155                         'page_title',
 156                         'page_restrictions',
 157                         'page_counter',
 158                         'page_is_redirect',
 159                         'page_is_new',
 160                         'page_random',
 161                         'page_touched',
 162                         'page_latest',
 163                         'page_len',
 164             'page_content_model',
 165                 );
 166         }
 167
 168         /**
 169          * Fetch a page record with the given conditions
 170          * @param $dbr DatabaseBase object
 171          * @param $conditions Array
 172          * @return mixed Database result resource, or false on failure
 173          */
 174         protected function pageData( $dbr, $conditions ) {
 175                 $fields = self::selectFields();
 176
 177                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 178
 179                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 180
 181                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 182
 183                 return $row;
 184         }
 185
 186         /**
 187          * Fetch a page record matching the Title object's namespace and title
 188          * using a sanitized title string
 189          *
 190          * @param $dbr DatabaseBase object
 191          * @param $title Title object
 192          * @return mixed Database result resource, or false on failure
 193          */
 194         public function pageDataFromTitle( $dbr, $title ) {
 195                 return $this->pageData( $dbr, array(
 196                         'page_namespace' => $title->getNamespace(),
 197                         'page_title'     => $title->getDBkey() ) );
 198         }
 199
 200         /**
 201          * Fetch a page record matching the requested ID
 202          *
 203          * @param $dbr DatabaseBase
 204          * @param $id Integer
 205          * @return mixed Database result resource, or false on failure
 206          */
 207         public function pageDataFromId( $dbr, $id ) {
 208                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 209         }
 210
 211         /**
 212          * Set the general counter, title etc data loaded from
 213          * some source.
 214          *
 215          * @param $data Object|String One of the following:
 216          *              A DB query result object or...
 217          *              "fromdb" to get from a slave DB or...
 218          *              "fromdbmaster" to get from the master DB
 219          * @return void
 220          */
 221         public function loadPageData( $data = 'fromdb' ) {
 222                 if ( $data === 'fromdbmaster' ) {
 223                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 224                 } elseif ( $data === 'fromdb' ) { // slave
 225                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 226                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 227                         # Note that DB also stores the master position in the session and checks it.
 228                         $touched = $this->getCachedLastEditTime();
 229                         if ( $touched ) { // key set
 230                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 231                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 232                                 }
 233                         }
 234                 }
 235
 236                 $lc = LinkCache::singleton();
 237
 238                 if ( $data ) {
 239                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 240
 241                         $this->mTitle->loadFromRow( $data );
 242
 243                         # Old-fashioned restrictions
 244                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 245
 246                         $this->mCounter     = intval( $data->page_counter );
 247                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 248                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 249                         $this->mLatest      = intval( $data->page_latest );
 250                 } else {
 251                         $lc->addBadLinkObj( $this->mTitle );
 252
 253                         $this->mTitle->loadFromRow( false );
 254                 }
 255
 256                 $this->mDataLoaded = true;
 257         }
 258
 259         /**
 260          * @return int Page ID
 261          */
 262         public function getId() {
 263                 return $this->mTitle->getArticleID();
 264         }
 265
 266         /**
 267          * @return bool Whether or not the page exists in the database
 268          */
 269         public function exists() {
 270                 return $this->mTitle->exists();
 271         }
 272
 273         /**
 274          * Check if this page is something we're going to be showing
 275          * some sort of sensible content for. If we return false, page
 276          * views (plain action=view) will return an HTTP 404 response,
 277          * so spiders and robots can know they're following a bad link.
 278          *
 279          * @return bool
 280          */
 281         public function hasViewableContent() {
 282                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 283         }
 284
 285         /**
 286          * @return int The view count for the page
 287          */
 288         public function getCount() {
 289                 if ( !$this->mDataLoaded ) {
 290                         $this->loadPageData();
 291                 }
 292
 293                 return $this->mCounter;
 294         }
 295
 296         /**
 297          * Tests if the article text represents a redirect
 298          *
 299          * @param $text mixed string containing article contents, or boolean
 300          * @return bool
 301          */
 302         public function isRedirect( $text = false ) {
 303         if ( $text === false ) $content = $this->getContent();
 304         else $content = ContentHandler::makeContent( $text, $this->mTitle ); # TODO: allow model and format to be provided; or better, expect a Content object
 305
 306
 307         if ( empty( $content ) ) return false;
 308         else return $content->isRedirect();
 309         }
 310
 311         /**
 312          * Loads page_touched and returns a value indicating if it should be used
 313          * @return boolean true if not a redirect
 314          */
 315         public function checkTouched() {
 316                 if ( !$this->mDataLoaded ) {
 317                         $this->loadPageData();
 318                 }
 319                 return !$this->mIsRedirect;
 320         }
 321
 322         /**
 323          * Get the page_touched field
 324          * @return string containing GMT timestamp
 325          */
 326         public function getTouched() {
 327                 if ( !$this->mDataLoaded ) {
 328                         $this->loadPageData();
 329                 }
 330                 return $this->mTouched;
 331         }
 332
 333         /**
 334          * Get the page_latest field
 335          * @return integer rev_id of current revision
 336          */
 337         public function getLatest() {
 338                 if ( !$this->mDataLoaded ) {
 339                         $this->loadPageData();
 340                 }
 341                 return (int)$this->mLatest;
 342         }
 343
 344         /**
 345          * Loads everything except the text
 346          * This isn't necessary for all uses, so it's only done if needed.
 347          */
 348         protected function loadLastEdit() {
 349                 if ( $this->mLastRevision !== null ) {
 350                         return; // already loaded
 351                 }
 352
 353                 $latest = $this->getLatest();
 354                 if ( !$latest ) {
 355                         return; // page doesn't exist or is missing page_latest info
 356                 }
 357
 358                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 359                 if ( $revision ) { // sanity
 360                         $this->setLastEdit( $revision );
 361                 }
 362         }
 363
 364         /**
 365          * Set the latest revision
 366          */
 367         protected function setLastEdit( Revision $revision ) {
 368                 $this->mLastRevision = $revision;
 369                 $this->mTimestamp = $revision->getTimestamp();
 370         }
 371
 372         /**
 373          * Get the latest revision
 374          * @return Revision|null
 375          */
 376         public function getRevision() {
 377                 $this->loadLastEdit();
 378                 if ( $this->mLastRevision ) {
 379                         return $this->mLastRevision;
 380                 }
 381                 return null;
 382         }
 383
 384     /**
 385      * Get the content of the current revision. No side-effects...
 386      *
 387      * @param $audience Integer: one of:
 388      *      Revision::FOR_PUBLIC       to be displayed to all users
 389      *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 390      *      Revision::RAW              get the text regardless of permissions
 391      * @return Content|null The content of the current revision
 392      */
 393     public function getContent( $audience = Revision::FOR_PUBLIC ) {
 394         $this->loadLastEdit();
 395         if ( $this->mLastRevision ) {
 396             return $this->mLastRevision->getContent( $audience );
 397         }
 398         return false;
 399     }
 400
 401         /**
 402          * Get the text of the current revision. No side-effects...
 403          *
 404          * @param $audience Integer: one of:
 405          *      Revision::FOR_PUBLIC       to be displayed to all users
 406          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 407          *      Revision::RAW              get the text regardless of permissions
 408          * @return String|false The text of the current revision
 409      * @deprecated as of 1.20, getContent() should be used instead.
 410          */
 411         public function getText( $audience = Revision::FOR_PUBLIC ) { #FIXME: deprecated, replace usage!
 412         wfDeprecated( __METHOD__, '1.20' );
 413                 $this->loadLastEdit();
 414                 if ( $this->mLastRevision ) {
 415                         return $this->mLastRevision->getText( $audience );
 416                 }
 417                 return false;
 418         }
 419
 420         /**
 421          * Get the text of the current revision. No side-effects...
 422          *
 423          * @return String|false The text of the current revision
 424          */
 425         public function getRawText() { #FIXME: deprecated, replace usage!
 426                 return $this->getText( Revision::RAW );
 427         }
 428
 429     /**
 430      * Get the content of the current revision. No side-effects...
 431      *
 432      * @return Contet|false The text of the current revision
 433      */
 434     protected function getNativeData() { #FIXME: examine all uses carefully! caller must be aware of content model!
 435         $content = $this->getContent( Revision::RAW );
 436         if ( !$content ) return null;
 437
 438         return $content->getNativeData();
 439     }
 440
 441         /**
 442          * @return string MW timestamp of last article revision
 443          */
 444         public function getTimestamp() {
 445                 // Check if the field has been filled by WikiPage::setTimestamp()
 446                 if ( !$this->mTimestamp ) {
 447                         $this->loadLastEdit();
 448                 }
 449                 return wfTimestamp( TS_MW, $this->mTimestamp );
 450         }
 451
 452         /**
 453          * Set the page timestamp (use only to avoid DB queries)
 454          * @param $ts string MW timestamp of last article revision
 455          * @return void
 456          */
 457         public function setTimestamp( $ts ) {
 458                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 459         }
 460
 461         /**
 462          * @param $audience Integer: one of:
 463          *      Revision::FOR_PUBLIC       to be displayed to all users
 464          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 465          *      Revision::RAW              get the text regardless of permissions
 466          * @return int user ID for the user that made the last article revision
 467          */
 468         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 469                 $this->loadLastEdit();
 470                 if ( $this->mLastRevision ) {
 471                         return $this->mLastRevision->getUser( $audience );
 472                 } else {
 473                         return -1;
 474                 }
 475         }
 476
 477         /**
 478          * @param $audience Integer: one of:
 479          *      Revision::FOR_PUBLIC       to be displayed to all users
 480          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 481          *      Revision::RAW              get the text regardless of permissions
 482          * @return string username of the user that made the last article revision
 483          */
 484         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 485                 $this->loadLastEdit();
 486                 if ( $this->mLastRevision ) {
 487                         return $this->mLastRevision->getUserText( $audience );
 488                 } else {
 489                         return '';
 490                 }
 491         }
 492
 493         /**
 494          * @param $audience Integer: one of:
 495          *      Revision::FOR_PUBLIC       to be displayed to all users
 496          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 497          *      Revision::RAW              get the text regardless of permissions
 498          * @return string Comment stored for the last article revision
 499          */
 500         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 501                 $this->loadLastEdit();
 502                 if ( $this->mLastRevision ) {
 503                         return $this->mLastRevision->getComment( $audience );
 504                 } else {
 505                         return '';
 506                 }
 507         }
 508
 509         /**
 510          * Returns true if last revision was marked as "minor edit"
 511          *
 512          * @return boolean Minor edit indicator for the last article revision.
 513          */
 514         public function getMinorEdit() {
 515                 $this->loadLastEdit();
 516                 if ( $this->mLastRevision ) {
 517                         return $this->mLastRevision->isMinor();
 518                 } else {
 519                         return false;
 520                 }
 521         }
 522
 523         /**
 524          * Get the cached timestamp for the last time the page changed.
 525          * This is only used to help handle slave lag by comparing to page_touched.
 526          * @return string MW timestamp
 527          */
 528         protected function getCachedLastEditTime() {
 529                 global $wgMemc;
 530                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 531                 return $wgMemc->get( $key );
 532         }
 533
 534         /**
 535          * Set the cached timestamp for the last time the page changed.
 536          * This is only used to help handle slave lag by comparing to page_touched.
 537          * @param $timestamp string
 538          * @return void
 539          */
 540         public function setCachedLastEditTime( $timestamp ) {
 541                 global $wgMemc;
 542                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 543                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 544         }
 545
 546         /**
 547          * Determine whether a page would be suitable for being counted as an
 548          * article in the site_stats table based on the title & its content
 549          *
 550          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 551          *        if false, the current database state will be used
 552          * @return Boolean
 553          */
 554         public function isCountable( $editInfo = false ) {
 555                 global $wgArticleCountMethod;
 556
 557                 if ( !$this->mTitle->isContentPage() ) {
 558                         return false;
 559                 }
 560
 561         if ( $editInfo ) {
 562             $content = ContentHandler::makeContent( $editInfo->pst, $this->mTitle );
 563             # TODO: take model and format from edit info!
 564         } else {
 565             $content = $this->getContent();
 566         }
 567
 568                 if ( !$content || $content->isRedirect( ) ) {
 569                         return false;
 570                 }
 571
 572         $hasLinks = null;
 573
 574         if ( $wgArticleCountMethod === 'link' ) {
 575             # nasty special case to avoid re-parsing to detect links
 576
 577             if ( $editInfo ) {
 578                 // ParserOutput::getLinks() is a 2D array of page links, so
 579                 // to be really correct we would need to recurse in the array
 580                 // but the main array should only have items in it if there are
 581                 // links.
 582                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 583             } else {
 584                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 585                     array( 'pl_from' => $this->getId() ), __METHOD__ );
 586             }
 587         }
 588
 589                 return $content->isCountable( $hasLinks );
 590         }
 591
 592         /**
 593          * If this page is a redirect, get its target
 594          *
 595          * The target will be fetched from the redirect table if possible.
 596          * If this page doesn't have an entry there, call insertRedirect()
 597          * @return Title|mixed object, or null if this page is not a redirect
 598          */
 599         public function getRedirectTarget() {
 600                 if ( !$this->mTitle->isRedirect() ) {
 601                         return null;
 602                 }
 603
 604                 if ( $this->mRedirectTarget !== null ) {
 605                         return $this->mRedirectTarget;
 606                 }
 607
 608                 # Query the redirect table
 609                 $dbr = wfGetDB( DB_SLAVE );
 610                 $row = $dbr->selectRow( 'redirect',
 611                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 612                         array( 'rd_from' => $this->getId() ),
 613                         __METHOD__
 614                 );
 615
 616                 // rd_fragment and rd_interwiki were added later, populate them if empty
 617                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 618                         return $this->mRedirectTarget = Title::makeTitle(
 619                                 $row->rd_namespace, $row->rd_title,
 620                                 $row->rd_fragment, $row->rd_interwiki );
 621                 }
 622
 623                 # This page doesn't have an entry in the redirect table
 624                 return $this->mRedirectTarget = $this->insertRedirect();
 625         }
 626
 627         /**
 628          * Insert an entry for this page into the redirect table.
 629          *
 630          * Don't call this function directly unless you know what you're doing.
 631          * @return Title object or null if not a redirect
 632          */
 633         public function insertRedirect() {
 634                 // recurse through to only get the final target
 635                 $retval = Title::newFromRedirectRecurse( $this->getRawText() ); #FIXME: move this to Content object
 636                 if ( !$retval ) {
 637                         return null;
 638                 }
 639                 $this->insertRedirectEntry( $retval );
 640                 return $retval;
 641         }
 642
 643         /**
 644          * Insert or update the redirect table entry for this page to indicate
 645          * it redirects to $rt .
 646          * @param $rt Title redirect target
 647          */
 648         public function insertRedirectEntry( $rt ) {
 649                 $dbw = wfGetDB( DB_MASTER );
 650                 $dbw->replace( 'redirect', array( 'rd_from' ),
 651                         array(
 652                                 'rd_from'      => $this->getId(),
 653                                 'rd_namespace' => $rt->getNamespace(),
 654                                 'rd_title'     => $rt->getDBkey(),
 655                                 'rd_fragment'  => $rt->getFragment(),
 656                                 'rd_interwiki' => $rt->getInterwiki(),
 657                         ),
 658                         __METHOD__
 659                 );
 660         }
 661
 662         /**
 663          * Get the Title object or URL this page redirects to
 664          *
 665          * @return mixed false, Title of in-wiki target, or string with URL
 666          */
 667         public function followRedirect() {
 668                 return $this->getRedirectURL( $this->getRedirectTarget() );
 669         }
 670
 671         /**
 672          * Get the Title object or URL to use for a redirect. We use Title
 673          * objects for same-wiki, non-special redirects and URLs for everything
 674          * else.
 675          * @param $rt Title Redirect target
 676          * @return mixed false, Title object of local target, or string with URL
 677          */
 678         public function getRedirectURL( $rt ) {
 679                 if ( !$rt ) {
 680                         return false;
 681                 }
 682
 683                 if ( $rt->isExternal() ) {
 684                         if ( $rt->isLocal() ) {
 685                                 // Offsite wikis need an HTTP redirect.
 686                                 //
 687                                 // This can be hard to reverse and may produce loops,
 688                                 // so they may be disabled in the site configuration.
 689                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 690                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 691                         } else {
 692                                 // External pages pages without "local" bit set are not valid
 693                                 // redirect targets
 694                                 return false;
 695                         }
 696                 }
 697
 698                 if ( $rt->isSpecialPage() ) {
 699                         // Gotta handle redirects to special pages differently:
 700                         // Fill the HTTP response "Location" header and ignore
 701                         // the rest of the page we're on.
 702                         //
 703                         // Some pages are not valid targets
 704                         if ( $rt->isValidRedirectTarget() ) {
 705                                 return $rt->getFullURL();
 706                         } else {
 707                                 return false;
 708                         }
 709                 }
 710
 711                 return $rt;
 712         }
 713
 714         /**
 715          * Get a list of users who have edited this article, not including the user who made
 716          * the most recent revision, which you can get from $article->getUser() if you want it
 717          * @return UserArrayFromResult
 718          */
 719         public function getContributors() {
 720                 # @todo FIXME: This is expensive; cache this info somewhere.
 721
 722                 $dbr = wfGetDB( DB_SLAVE );
 723
 724                 if ( $dbr->implicitGroupby() ) {
 725                         $realNameField = 'user_real_name';
 726                 } else {
 727                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 728                 }
 729
 730                 $tables = array( 'revision', 'user' );
 731
 732                 $fields = array(
 733                         'rev_user as user_id',
 734                         'rev_user_text AS user_name',
 735                         $realNameField,
 736                         'MAX(rev_timestamp) AS timestamp',
 737                 );
 738
 739                 $conds = array( 'rev_page' => $this->getId() );
 740
 741                 // The user who made the top revision gets credited as "this page was last edited by
 742                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 743                 $user = $this->getUser();
 744                 if ( $user ) {
 745                         $conds[] = "rev_user != $user";
 746                 } else {
 747                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 748                 }
 749
 750                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 751
 752                 $jconds = array(
 753                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 754                 );
 755
 756                 $options = array(
 757                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 758                         'ORDER BY' => 'timestamp DESC',
 759                 );
 760
 761                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 762                 return new UserArrayFromResult( $res );
 763         }
 764
 765         /**
 766          * Get the last N authors
 767          * @param $num Integer: number of revisions to get
 768          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 769          * @return array Array of authors, duplicates not removed
 770          */
 771         public function getLastNAuthors( $num, $revLatest = 0 ) {
 772                 wfProfileIn( __METHOD__ );
 773                 // First try the slave
 774                 // If that doesn't have the latest revision, try the master
 775                 $continue = 2;
 776                 $db = wfGetDB( DB_SLAVE );
 777
 778                 do {
 779                         $res = $db->select( array( 'page', 'revision' ),
 780                                 array( 'rev_id', 'rev_user_text' ),
 781                                 array(
 782                                         'page_namespace' => $this->mTitle->getNamespace(),
 783                                         'page_title' => $this->mTitle->getDBkey(),
 784                                         'rev_page = page_id'
 785                                 ), __METHOD__,
 786                                 array(
 787                                         'ORDER BY' => 'rev_timestamp DESC',
 788                                         'LIMIT' => $num
 789                                 )
 790                         );
 791
 792                         if ( !$res ) {
 793                                 wfProfileOut( __METHOD__ );
 794                                 return array();
 795                         }
 796
 797                         $row = $db->fetchObject( $res );
 798
 799                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 800                                 $db = wfGetDB( DB_MASTER );
 801                                 $continue--;
 802                         } else {
 803                                 $continue = 0;
 804                         }
 805                 } while ( $continue );
 806
 807                 $authors = array( $row->rev_user_text );
 808
 809                 foreach ( $res as $row ) {
 810                         $authors[] = $row->rev_user_text;
 811                 }
 812
 813                 wfProfileOut( __METHOD__ );
 814                 return $authors;
 815         }
 816
 817         /**
 818          * Should the parser cache be used?
 819          *
 820          * @param $parserOptions ParserOptions to check
 821          * @param $oldid int
 822          * @return boolean
 823          */
 824         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 825                 global $wgEnableParserCache;
 826
 827                 return $wgEnableParserCache
 828                         && $parserOptions->getStubThreshold() == 0
 829                         && $this->mTitle->exists()
 830                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 831                         && $this->mTitle->isWikitextPage(); #FIXME: ask ContentHandler if cachable!
 832         }
 833
 834         /**
 835          * Get a ParserOutput for the given ParserOptions and revision ID.
 836          * The parser cache will be used if possible.
 837          *
 838          * @since 1.19
 839          * @param $parserOptions ParserOptions to use for the parse operation
 840          * @param $oldid Revision ID to get the text from, passing null or 0 will
 841          *               get the current revision (default value)
 842          * @return ParserOutput or false if the revision was not found
 843          */
 844         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
 845                 wfProfileIn( __METHOD__ );
 846
 847                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 848                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 849                 if ( $parserOptions->getStubThreshold() ) {
 850                         wfIncrStats( 'pcache_miss_stub' );
 851                 }
 852
 853                 if ( $useParserCache ) {
 854                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 855                         if ( $parserOutput !== false ) {
 856                                 wfProfileOut( __METHOD__ );
 857                                 return $parserOutput;
 858                         }
 859                 }
 860
 861                 if ( $oldid === null || $oldid === 0 ) {
 862                         $oldid = $this->getLatest();
 863                 }
 864
 865                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
 866                 $pool->execute();
 867
 868                 wfProfileOut( __METHOD__ );
 869
 870                 return $pool->getParserOutput();
 871         }
 872
 873         /**
 874          * Do standard deferred updates after page view
 875          * @param $user User The relevant user
 876          */
 877         public function doViewUpdates( User $user ) {
 878                 global $wgDisableCounters;
 879                 if ( wfReadOnly() ) {
 880                         return;
 881                 }
 882
 883                 # Don't update page view counters on views from bot users (bug 14044)
 884                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
 885                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
 886                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
 887                 }
 888
 889                 # Update newtalk / watchlist notification status
 890                 $user->clearNotification( $this->mTitle );
 891         }
 892
 893         /**
 894          * Perform the actions of a page purging
 895          */
 896         public function doPurge() {
 897                 global $wgUseSquid;
 898
 899                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 900                         return false;
 901                 }
 902
 903                 // Invalidate the cache
 904                 $this->mTitle->invalidateCache();
 905                 $this->clear();
 906
 907                 if ( $wgUseSquid ) {
 908                         // Commit the transaction before the purge is sent
 909                         $dbw = wfGetDB( DB_MASTER );
 910                         $dbw->commit();
 911
 912                         // Send purge
 913                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 914                         $update->doUpdate();
 915                 }
 916
 917                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 918                         if ( $this->mTitle->exists() ) {
 919                                 $text = $this->getNativeData(); #FIXME: may not be a string. check Content model!
 920                         } else {
 921                                 $text = false;
 922                         }
 923
 924                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 925                 }
 926                 return true;
 927         }
 928
 929         /**
 930          * Insert a new empty page record for this article.
 931          * This *must* be followed up by creating a revision
 932          * and running $this->updateRevisionOn( ... );
 933          * or else the record will be left in a funky state.
 934          * Best if all done inside a transaction.
 935          *
 936          * @param $dbw DatabaseBase
 937          * @return int The newly created page_id key, or false if the title already existed
 938          */
 939         public function insertOn( $dbw ) {
 940                 wfProfileIn( __METHOD__ );
 941
 942                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 943                 $dbw->insert( 'page', array(
 944                         'page_id'           => $page_id,
 945                         'page_namespace'    => $this->mTitle->getNamespace(),
 946                         'page_title'        => $this->mTitle->getDBkey(),
 947                         'page_counter'      => 0,
 948                         'page_restrictions' => '',
 949                         'page_is_redirect'  => 0, # Will set this shortly...
 950                         'page_is_new'       => 1,
 951                         'page_random'       => wfRandom(),
 952                         'page_touched'      => $dbw->timestamp(),
 953                         'page_latest'       => 0, # Fill this in shortly...
 954                         'page_len'          => 0, # Fill this in shortly...
 955                 ), __METHOD__, 'IGNORE' );
 956
 957                 $affected = $dbw->affectedRows();
 958
 959                 if ( $affected ) {
 960                         $newid = $dbw->insertId();
 961                         $this->mTitle->resetArticleID( $newid );
 962                 }
 963                 wfProfileOut( __METHOD__ );
 964
 965                 return $affected ? $newid : false;
 966         }
 967
 968         /**
 969          * Update the page record to point to a newly saved revision.
 970          *
 971          * @param $dbw DatabaseBase: object
 972          * @param $revision Revision: For ID number, and text used to set
 973          *                  length and redirect status fields
 974          * @param $lastRevision Integer: if given, will not overwrite the page field
 975          *                      when different from the currently set value.
 976          *                      Giving 0 indicates the new page flag should be set
 977          *                      on.
 978          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 979          *                           removing rows in redirect table.
 980          * @return bool true on success, false on failure
 981          * @private
 982          */
 983         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 984                 wfProfileIn( __METHOD__ );
 985
 986                 $text = $revision->getText();
 987                 $len = strlen( $text );
 988                 $rt = Title::newFromRedirectRecurse( $text );
 989
 990                 $conditions = array( 'page_id' => $this->getId() );
 991
 992                 if ( !is_null( $lastRevision ) ) {
 993                         # An extra check against threads stepping on each other
 994                         $conditions['page_latest'] = $lastRevision;
 995                 }
 996
 997                 $now = wfTimestampNow();
 998                 $dbw->update( 'page',
 999                         array( /* SET */
1000                                 'page_latest'      => $revision->getId(),
1001                                 'page_touched'     => $dbw->timestamp( $now ),
1002                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1003                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1004                                 'page_len'         => $len,
1005                         ),
1006                         $conditions,
1007                         __METHOD__ );
1008
1009                 $result = $dbw->affectedRows() != 0;
1010                 if ( $result ) {
1011                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1012                         $this->setLastEdit( $revision );
1013                         $this->setCachedLastEditTime( $now );
1014                         $this->mLatest = $revision->getId();
1015                         $this->mIsRedirect = (bool)$rt;
1016                         # Update the LinkCache.
1017                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1018                 }
1019
1020                 wfProfileOut( __METHOD__ );
1021                 return $result;
1022         }
1023
1024         /**
1025          * Add row to the redirect table if this is a redirect, remove otherwise.
1026          *
1027          * @param $dbw DatabaseBase
1028          * @param $redirectTitle Title object pointing to the redirect target,
1029          *                       or NULL if this is not a redirect
1030          * @param $lastRevIsRedirect If given, will optimize adding and
1031          *                           removing rows in redirect table.
1032          * @return bool true on success, false on failure
1033          * @private
1034          */
1035         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1036                 // Always update redirects (target link might have changed)
1037                 // Update/Insert if we don't know if the last revision was a redirect or not
1038                 // Delete if changing from redirect to non-redirect
1039                 $isRedirect = !is_null( $redirectTitle );
1040
1041                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1042                         return true;
1043                 }
1044
1045                 wfProfileIn( __METHOD__ );
1046                 if ( $isRedirect ) {
1047                         $this->insertRedirectEntry( $redirectTitle );
1048                 } else {
1049                         // This is not a redirect, remove row from redirect table
1050                         $where = array( 'rd_from' => $this->getId() );
1051                         $dbw->delete( 'redirect', $where, __METHOD__ );
1052                 }
1053
1054                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1055                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1056                 }
1057                 wfProfileOut( __METHOD__ );
1058
1059                 return ( $dbw->affectedRows() != 0 );
1060         }
1061
1062         /**
1063          * If the given revision is newer than the currently set page_latest,
1064          * update the page record. Otherwise, do nothing.
1065          *
1066          * @param $dbw Database object
1067          * @param $revision Revision object
1068          * @return mixed
1069          */
1070         public function updateIfNewerOn( $dbw, $revision ) {
1071                 wfProfileIn( __METHOD__ );
1072
1073                 $row = $dbw->selectRow(
1074                         array( 'revision', 'page' ),
1075                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1076                         array(
1077                                 'page_id' => $this->getId(),
1078                                 'page_latest=rev_id' ),
1079                         __METHOD__ );
1080
1081                 if ( $row ) {
1082                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1083                                 wfProfileOut( __METHOD__ );
1084                                 return false;
1085                         }
1086                         $prev = $row->rev_id;
1087                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1088                 } else {
1089                         # No or missing previous revision; mark the page as new
1090                         $prev = 0;
1091                         $lastRevIsRedirect = null;
1092                 }
1093
1094                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1095
1096                 wfProfileOut( __METHOD__ );
1097                 return $ret;
1098         }
1099
1100         /**
1101          * Get the text that needs to be saved in order to undo all revisions
1102          * between $undo and $undoafter. Revisions must belong to the same page,
1103          * must exist and must not be deleted
1104          * @param $undo Revision
1105          * @param $undoafter Revision Must be an earlier revision than $undo
1106          * @return mixed string on success, false on failure
1107      * @deprecated since 1.20: use ContentHandler::getUndoContent() instead.
1108          */
1109         public function getUndoText( Revision $undo, Revision $undoafter = null ) { #FIXME: replace usages.
1110         $this->loadLastEdit();
1111
1112         if ( $this->mLastRevision ) {
1113             $handler = ContentHandler::getForTitle( $this->getTitle() );
1114             $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1115
1116             if ( !$undone ) {
1117                 return false;
1118             } else {
1119                 return ContentHandler::getContentText( $undone );
1120             }
1121         }
1122
1123         return false;
1124         }
1125
1126         /**
1127          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1128          * @param $text String: new text of the section
1129          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1130          * @param $edittime String: revision timestamp or null to use the current revision
1131          * @return Content new complete article content, or null if error
1132      * @deprecated since 1.20: use Content::replaceSection () instead.
1133          */
1134         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) { #FIXME: create a Content-based version (take and return Content object)
1135                 wfProfileIn( __METHOD__ );
1136
1137         $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() ); #XXX: could make section title, but that's not required.
1138
1139                 if ( strval( $section ) == '' ) {
1140                         // Whole-page edit; let the whole text through
1141             $newContent = $sectionContent;
1142                 } else {
1143                         // Bug 30711: always use current version when adding a new section
1144                         if ( is_null( $edittime ) || $section == 'new' ) {
1145                                 $oldContent = $this->getContent();
1146                                 if ( ! $oldContent ) {
1147                                         wfDebug( __METHOD__ . ": no page text\n" );
1148                                         wfProfileOut( __METHOD__ );
1149                                         return null;
1150                                 }
1151                         } else {
1152                                 $dbw = wfGetDB( DB_MASTER );
1153                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1154
1155                                 if ( !$rev ) {
1156                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1157                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1158                                         wfProfileOut( __METHOD__ );
1159                                         return null;
1160                                 }
1161
1162                 $oldContent = $rev->getContent();
1163                         }
1164
1165             $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1166                 }
1167
1168                 wfProfileOut( __METHOD__ );
1169                 return ContentHandler::getContentText( $newContent ); #XXX: unclear what will happen for non-wikitext!
1170         }
1171
1172         /**
1173          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1174          * @param $flags Int
1175          * @return Int updated $flags
1176          */
1177         function checkFlags( $flags ) {
1178                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1179                         if ( $this->mTitle->getArticleID() ) {
1180                                 $flags |= EDIT_UPDATE;
1181                         } else {
1182                                 $flags |= EDIT_NEW;
1183                         }
1184                 }
1185
1186                 return $flags;
1187         }
1188
1189         /**
1190          * Change an existing article or create a new article. Updates RC and all necessary caches,
1191          * optionally via the deferred update array.
1192          *
1193          * @param $text String: new text
1194          * @param $summary String: edit summary
1195          * @param $flags Integer bitfield:
1196          *      EDIT_NEW
1197          *          Article is known or assumed to be non-existent, create a new one
1198          *      EDIT_UPDATE
1199          *          Article is known or assumed to be pre-existing, update it
1200          *      EDIT_MINOR
1201          *          Mark this edit minor, if the user is allowed to do so
1202          *      EDIT_SUPPRESS_RC
1203          *          Do not log the change in recentchanges
1204          *      EDIT_FORCE_BOT
1205          *          Mark the edit a "bot" edit regardless of user rights
1206          *      EDIT_DEFER_UPDATES
1207          *          Defer some of the updates until the end of index.php
1208          *      EDIT_AUTOSUMMARY
1209          *          Fill in blank summaries with generated text where possible
1210          *
1211          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1212          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1213          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1214          * edit-already-exists error will be returned. These two conditions are also possible with
1215          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1216          *
1217          * @param $baseRevId the revision ID this edit was based off, if any
1218          * @param $user User the user doing the edit
1219          *
1220          * @return Status object. Possible errors:
1221          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1222          *     edit-gone-missing:       In update mode, but the article didn't exist
1223          *     edit-conflict:           In update mode, the article changed unexpectedly
1224          *     edit-no-change:          Warning that the text was the same as before
1225          *     edit-already-exists:     In creation mode, but the article already exists
1226          *
1227          *  Extensions may define additional errors.
1228          *
1229          *  $return->value will contain an associative array with members as follows:
1230          *     new:                     Boolean indicating if the function attempted to create a new article
1231          *     revision:                The revision object for the inserted revision, or null
1232          *
1233          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1234      * @deprecated since 1.20: use doEditContent() instead.
1235          */
1236     public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) { #FIXME: use doEditContent() instead
1237         #TODO: log use of deprecated function
1238         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1239
1240         return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1241     }
1242
1243     /**
1244      * Change an existing article or create a new article. Updates RC and all necessary caches,
1245      * optionally via the deferred update array.
1246      *
1247      * @param $content Content: new content
1248      * @param $summary String: edit summary
1249      * @param $flags Integer bitfield:
1250      *      EDIT_NEW
1251      *          Article is known or assumed to be non-existent, create a new one
1252      *      EDIT_UPDATE
1253      *          Article is known or assumed to be pre-existing, update it
1254      *      EDIT_MINOR
1255      *          Mark this edit minor, if the user is allowed to do so
1256      *      EDIT_SUPPRESS_RC
1257      *          Do not log the change in recentchanges
1258      *      EDIT_FORCE_BOT
1259      *          Mark the edit a "bot" edit regardless of user rights
1260      *      EDIT_DEFER_UPDATES
1261      *          Defer some of the updates until the end of index.php
1262      *      EDIT_AUTOSUMMARY
1263      *          Fill in blank summaries with generated text where possible
1264      *
1265      * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1266      * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1267      * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1268      * edit-already-exists error will be returned. These two conditions are also possible with
1269      * auto-detection due to MediaWiki's performance-optimised locking strategy.
1270      *
1271      * @param $baseRevId the revision ID this edit was based off, if any
1272      * @param $user User the user doing the edit
1273      * @param $serialisation_format String: format for storing the content in the database
1274      *
1275      * @return Status object. Possible errors:
1276      *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1277      *     edit-gone-missing:       In update mode, but the article didn't exist
1278      *     edit-conflict:           In update mode, the article changed unexpectedly
1279      *     edit-no-change:          Warning that the text was the same as before
1280      *     edit-already-exists:     In creation mode, but the article already exists
1281      *
1282      *  Extensions may define additional errors.
1283      *
1284      *  $return->value will contain an associative array with members as follows:
1285      *     new:                     Boolean indicating if the function attempted to create a new article
1286      *     revision:                The revision object for the inserted revision, or null
1287      *
1288      *  Compatibility note: this function previously returned a boolean value indicating success/failure
1289      */
1290         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1291                                    User $user = null, $serialisation_format = null ) { #FIXME: use this
1292                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1293
1294                 # Low-level sanity check
1295                 if ( $this->mTitle->getText() === '' ) {
1296                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1297                 }
1298
1299                 wfProfileIn( __METHOD__ );
1300
1301                 $user = is_null( $user ) ? $wgUser : $user;
1302                 $status = Status::newGood( array() );
1303
1304                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1305                 $this->loadPageData( 'fromdbmaster' );
1306
1307                 $flags = $this->checkFlags( $flags );
1308
1309         # call legacy hook
1310         $hook_ok = wfRunHooks( 'ArticleContentSave', array( &$this, &$user, &$content, &$summary, #FIXME: document new hook!
1311             $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1312
1313         if ( $hook_ok && !empty( $wgHooks['ArticleSave'] ) ) { # avoid serialization overhead if the hook isn't present
1314             $content_text = $content->serialize();
1315             $txt = $content_text; # clone
1316
1317             $hook_ok = wfRunHooks( 'ArticleSave', array( &$this, &$user, &$txt, &$summary, #FIXME: deprecate legacy hook!
1318                 $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1319
1320             if ( $txt !== $content_text ) {
1321                 # if the text changed, unserialize the new version to create an updated Content object.
1322                 $content = $content->getContentHandler()->unserialize( $txt );
1323             }
1324         }
1325
1326                 if ( !$hook_ok ) {
1327                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1328
1329                         if ( $status->isOK() ) {
1330                                 $status->fatal( 'edit-hook-aborted' );
1331                         }
1332
1333                         wfProfileOut( __METHOD__ );
1334                         return $status;
1335                 }
1336
1337                 # Silently ignore EDIT_MINOR if not allowed
1338                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1339                 $bot = $flags & EDIT_FORCE_BOT;
1340
1341                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1342
1343                 $oldsize = $old_content ? $old_content->getSize() : 0;
1344                 $oldid = $this->getLatest();
1345                 $oldIsRedirect = $this->isRedirect();
1346                 $oldcountable = $this->isCountable();
1347
1348         $handler = $content->getContentHandler();
1349
1350                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1351                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1352                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1353                 }
1354
1355                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1356                 $serialized = $editInfo->pst;
1357         $content = $editInfo->pstContent;
1358                 $newsize =  $content->getSize();
1359
1360                 $dbw = wfGetDB( DB_MASTER );
1361                 $now = wfTimestampNow();
1362                 $this->mTimestamp = $now;
1363
1364                 if ( $flags & EDIT_UPDATE ) {
1365                         # Update article, but only if changed.
1366                         $status->value['new'] = false;
1367
1368                         if ( !$oldid ) {
1369                                 # Article gone missing
1370                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1371                                 $status->fatal( 'edit-gone-missing' );
1372
1373                                 wfProfileOut( __METHOD__ );
1374                                 return $status;
1375                         }
1376
1377                         # Make sure the revision is either completely inserted or not inserted at all
1378                         if ( !$wgDBtransactions ) {
1379                                 $userAbort = ignore_user_abort( true );
1380                         }
1381
1382                         $revision = new Revision( array(
1383                                 'page'       => $this->getId(),
1384                                 'comment'    => $summary,
1385                                 'minor_edit' => $isminor,
1386                                 'text'       => $serialized,
1387                 'len'        => $newsize,
1388                                 'parent_id'  => $oldid,
1389                                 'user'       => $user->getId(),
1390                                 'user_text'  => $user->getName(),
1391                                 'timestamp'  => $now
1392                         ) );
1393
1394                         $changed = !$content->equals( $old_content );
1395
1396                         if ( $changed ) {
1397                                 $dbw->begin();
1398                                 $revisionId = $revision->insertOn( $dbw );
1399
1400                                 # Update page
1401                                 #
1402                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1403                                 # during the course of this function. This makes sure that EditPage can detect
1404                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1405                                 # before this function is called. A previous function used a separate query, this
1406                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1407                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1408
1409                                 if ( !$ok ) {
1410                                         /* Belated edit conflict! Run away!! */
1411                                         $status->fatal( 'edit-conflict' );
1412
1413                                         # Delete the invalid revision if the DB is not transactional
1414                                         if ( !$wgDBtransactions ) {
1415                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1416                                         }
1417
1418                                         $revisionId = 0;
1419                                         $dbw->rollback();
1420                                 } else {
1421                                         global $wgUseRCPatrol;
1422                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1423                                         # Update recentchanges
1424                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1425                                                 # Mark as patrolled if the user can do so
1426                                                 $patrolled = $wgUseRCPatrol && !count(
1427                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1428                                                 # Add RC row to the DB
1429                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1430                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1431                                                         $revisionId, $patrolled
1432                                                 );
1433
1434                                                 # Log auto-patrolled edits
1435                                                 if ( $patrolled ) {
1436                                                         PatrolLog::record( $rc, true );
1437                                                 }
1438                                         }
1439                                         $user->incEditCount();
1440                                         $dbw->commit();
1441                                 }
1442                         } else {
1443                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1444                                 // related variables correctly
1445                                 $revision->setId( $this->getLatest() );
1446                         }
1447
1448                         if ( !$wgDBtransactions ) {
1449                                 ignore_user_abort( $userAbort );
1450                         }
1451
1452                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1453                         if ( !$status->isOK() ) {
1454                                 wfProfileOut( __METHOD__ );
1455                                 return $status;
1456                         }
1457
1458                         # Update links tables, site stats, etc.
1459                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1460                                 'oldcountable' => $oldcountable ) );
1461
1462                         if ( !$changed ) {
1463                                 $status->warning( 'edit-no-change' );
1464                                 $revision = null;
1465                                 // Update page_touched, this is usually implicit in the page update
1466                                 // Other cache updates are done in onArticleEdit()
1467                                 $this->mTitle->invalidateCache();
1468                         }
1469                 } else {
1470                         # Create new article
1471                         $status->value['new'] = true;
1472
1473                         $dbw->begin();
1474
1475                         # Add the page record; stake our claim on this title!
1476                         # This will return false if the article already exists
1477                         $newid = $this->insertOn( $dbw );
1478
1479                         if ( $newid === false ) {
1480                                 $dbw->rollback();
1481                                 $status->fatal( 'edit-already-exists' );
1482
1483                                 wfProfileOut( __METHOD__ );
1484                                 return $status;
1485                         }
1486
1487                         # Save the revision text...
1488                         $revision = new Revision( array(
1489                                 'page'       => $newid,
1490                                 'comment'    => $summary,
1491                                 'minor_edit' => $isminor,
1492                                 'text'       => $serialized,
1493                 'len'        => $newsize,
1494                                 'user'       => $user->getId(),
1495                                 'user_text'  => $user->getName(),
1496                                 'timestamp'  => $now
1497                         ) );
1498                         $revisionId = $revision->insertOn( $dbw );
1499
1500                         # Update the page record with revision data
1501                         $this->updateRevisionOn( $dbw, $revision, 0 );
1502
1503                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1504
1505                         # Update recentchanges
1506                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1507                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1508
1509                                 # Mark as patrolled if the user can do so
1510                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1511                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1512                                 # Add RC row to the DB
1513                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1514                                         '', $content->getSize(), $revisionId, $patrolled );
1515
1516                                 # Log auto-patrolled edits
1517                                 if ( $patrolled ) {
1518                                         PatrolLog::record( $rc, true );
1519                                 }
1520                         }
1521                         $user->incEditCount();
1522                         $dbw->commit();
1523
1524                         # Update links, etc.
1525                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1526
1527                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $serialized, $summary, #FIXME: deprecate legacy hook
1528                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1529
1530             wfRunHooks( 'ArticleContentInsertComplete', array( &$this, &$user, $content, $summary, #FIXME: document new hook
1531                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1532                 }
1533
1534                 # Do updates right now unless deferral was requested
1535                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1536                         DeferredUpdates::doUpdates();
1537                 }
1538
1539                 // Return the new revision (or null) to the caller
1540                 $status->value['revision'] = $revision;
1541
1542                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $serialized, $summary,  #FIXME: deprecate legacy hook
1543                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1544
1545         wfRunHooks( 'ArticleContentSaveComplete', array( &$this, &$user, $content, $summary, #FIXME: document new hook
1546             $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1547
1548                 # Promote user to any groups they meet the criteria for
1549                 $user->addAutopromoteOnceGroups( 'onEdit' );
1550
1551                 wfProfileOut( __METHOD__ );
1552                 return $status;
1553         }
1554
1555         /**
1556          * Get parser options suitable for rendering the primary article wikitext
1557          * @param User|string $user User object or 'canonical'
1558          * @return ParserOptions
1559          */
1560         public function makeParserOptions( $user ) {
1561                 global $wgContLang;
1562                 if ( $user instanceof User ) { // settings per user (even anons)
1563                         $options = ParserOptions::newFromUser( $user );
1564                 } else { // canonical settings
1565                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1566                 }
1567                 $options->enableLimitReport(); // show inclusion/loop reports
1568                 $options->setTidy( true ); // fix bad HTML
1569                 return $options;
1570         }
1571
1572         /**
1573          * Prepare text which is about to be saved.
1574          * Returns a stdclass with source, pst and output members
1575      * @deprecated in 1.20: use prepareContentForEdit instead.
1576          */
1577     public function prepareTextForEdit( $text, $revid = null, User $user = null ) {  #FIXME: use prepareContentForEdit() instead #XXX: who uses this?!
1578         #TODO: log use of deprecated function
1579         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1580         return $this->prepareContentForEdit( $content, $revid , $user );
1581     }
1582
1583     /**
1584      * Prepare content which is about to be saved.
1585      * Returns a stdclass with source, pst and output members
1586      *
1587      * @param \Content $content
1588      * @param null $revid
1589      * @param null|\User $user
1590      * @param null $serialization_format
1591      * @return bool|object
1592      */
1593         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) { #FIXME: use this #XXX: really public?!
1594                 global $wgParser, $wgContLang, $wgUser;
1595                 $user = is_null( $user ) ? $wgUser : $user;
1596                 // @TODO fixme: check $user->getId() here???
1597
1598                 if ( $this->mPreparedEdit
1599                         && $this->mPreparedEdit->newContent
1600             && $this->mPreparedEdit->newContent->equals( $content )
1601                         && $this->mPreparedEdit->revid == $revid
1602             && $this->mPreparedEdit->format == $serialization_format
1603             #XXX: also check $user here?
1604                 ) {
1605                         // Already prepared
1606                         return $this->mPreparedEdit;
1607                 }
1608
1609                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1610                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1611
1612                 $edit = (object)array();
1613                 $edit->revid = $revid;
1614
1615                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1616         $edit->pst = $edit->pstContent->serialize( $serialization_format );
1617         $edit->format = $serialization_format;
1618
1619                 $edit->popts = $this->makeParserOptions( 'canonical' );
1620                 $edit->output = $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts );
1621
1622         $edit->newContent = $content;
1623                 $edit->oldContent = $this->getContent( Revision::RAW );
1624
1625         $edit->newText = ContentHandler::getContentText( $edit->newContent ); #FIXME: B/C only! don't use this field!
1626         $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : ''; #FIXME: B/C only! don't use this field!
1627
1628                 $this->mPreparedEdit = $edit;
1629
1630                 return $edit;
1631         }
1632
1633         /**
1634          * Do standard deferred updates after page edit.
1635          * Update links tables, site stats, search index and message cache.
1636          * Purges pages that include this page if the text was changed here.
1637          * Every 100th edit, prune the recent changes table.
1638          *
1639          * @private
1640          * @param $revision Revision object
1641          * @param $user User object that did the revision
1642          * @param $options Array of options, following indexes are used:
1643          * - changed: boolean, whether the revision changed the content (default true)
1644          * - created: boolean, whether the revision created the page (default false)
1645          * - oldcountable: boolean or null (default null):
1646          *   - boolean: whether the page was counted as an article before that
1647          *     revision, only used in changed is true and created is false
1648          *   - null: don't change the article count
1649          */
1650         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1651                 global $wgEnableParserCache;
1652
1653                 wfProfileIn( __METHOD__ );
1654
1655                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1656                 $text = $revision->getText();
1657
1658                 # Parse the text
1659                 # Be careful not to double-PST: $text is usually already PST-ed once
1660                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1661                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1662                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1663                 } else {
1664                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1665                         $editInfo = $this->mPreparedEdit;
1666                 }
1667
1668                 # Save it to the parser cache
1669                 if ( $wgEnableParserCache ) {
1670                         $parserCache = ParserCache::singleton();
1671                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1672                 }
1673
1674                 # Update the links tables
1675                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1676                 $u->doUpdate();
1677
1678                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1679
1680                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1681                         if ( 0 == mt_rand( 0, 99 ) ) {
1682                                 // Flush old entries from the `recentchanges` table; we do this on
1683                                 // random requests so as to avoid an increase in writes for no good reason
1684                                 global $wgRCMaxAge;
1685
1686                                 $dbw = wfGetDB( DB_MASTER );
1687                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1688                                 $dbw->delete(
1689                                         'recentchanges',
1690                                         array( "rc_timestamp < '$cutoff'" ),
1691                                         __METHOD__
1692                                 );
1693                         }
1694                 }
1695
1696                 if ( !$this->mTitle->exists() ) {
1697                         wfProfileOut( __METHOD__ );
1698                         return;
1699                 }
1700
1701                 $id = $this->getId();
1702                 $title = $this->mTitle->getPrefixedDBkey();
1703                 $shortTitle = $this->mTitle->getDBkey();
1704
1705                 if ( !$options['changed'] ) {
1706                         $good = 0;
1707                         $total = 0;
1708                 } elseif ( $options['created'] ) {
1709                         $good = (int)$this->isCountable( $editInfo );
1710                         $total = 1;
1711                 } elseif ( $options['oldcountable'] !== null ) {
1712                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1713                         $total = 0;
1714                 } else {
1715                         $good = 0;
1716                         $total = 0;
1717                 }
1718
1719                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1720                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
1721
1722                 # If this is another user's talk page, update newtalk.
1723                 # Don't do this if $options['changed'] = false (null-edits) nor if
1724                 # it's a minor edit and the user doesn't want notifications for those.
1725                 if ( $options['changed']
1726                         && $this->mTitle->getNamespace() == NS_USER_TALK
1727                         && $shortTitle != $user->getTitleKey()
1728                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1729                 ) {
1730                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1731                                 $other = User::newFromName( $shortTitle, false );
1732                                 if ( !$other ) {
1733                                         wfDebug( __METHOD__ . ": invalid username\n" );
1734                                 } elseif ( User::isIP( $shortTitle ) ) {
1735                                         // An anonymous user
1736                                         $other->setNewtalk( true );
1737                                 } elseif ( $other->isLoggedIn() ) {
1738                                         $other->setNewtalk( true );
1739                                 } else {
1740                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1741                                 }
1742                         }
1743                 }
1744
1745                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1746                         MessageCache::singleton()->replace( $shortTitle, $text );
1747                 }
1748
1749                 if( $options['created'] ) {
1750                         self::onArticleCreate( $this->mTitle );
1751                 } else {
1752                         self::onArticleEdit( $this->mTitle );
1753                 }
1754
1755                 wfProfileOut( __METHOD__ );
1756         }
1757
1758         /**
1759          * Edit an article without doing all that other stuff
1760          * The article must already exist; link tables etc
1761          * are not updated, caches are not flushed.
1762          *
1763          * @param $text String: text submitted
1764          * @param $user User The relevant user
1765          * @param $comment String: comment submitted
1766          * @param $minor Boolean: whereas it's a minor modification
1767          */
1768     public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1769         #TODO: log use of deprecated function
1770         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1771         return $this->doQuickEdit( $content, $user, $comment , $minor );
1772     }
1773
1774     /**
1775      * Edit an article without doing all that other stuff
1776      * The article must already exist; link tables etc
1777      * are not updated, caches are not flushed.
1778      *
1779      * @param $content Content: content submitted
1780      * @param $user User The relevant user
1781      * @param $comment String: comment submitted
1782      * @param $serialisation_format String: format for storing the content in the database
1783      * @param $minor Boolean: whereas it's a minor modification
1784      */
1785         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
1786                 wfProfileIn( __METHOD__ );
1787
1788         $serialized = $content->serialize( $serialisation_format );
1789
1790                 $dbw = wfGetDB( DB_MASTER );
1791                 $revision = new Revision( array(
1792                         'page'       => $this->getId(),
1793                         'text'       => $serialized,
1794             'length'     => $content->getSize(),
1795                         'comment'    => $comment,
1796                         'minor_edit' => $minor ? 1 : 0,
1797                 ) );
1798                 $revision->insertOn( $dbw );
1799                 $this->updateRevisionOn( $dbw, $revision );
1800
1801                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1802
1803                 wfProfileOut( __METHOD__ );
1804         }
1805
1806         /**
1807          * Update the article's restriction field, and leave a log entry.
1808          * This works for protection both existing and non-existing pages.
1809          *
1810          * @param $limit Array: set of restriction keys
1811          * @param $reason String
1812          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1813          * @param $expiry Array: per restriction type expiration
1814          * @param $user User The user updating the restrictions
1815          * @return bool true on success
1816          */
1817         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1818                 global $wgContLang;
1819
1820                 if ( wfReadOnly() ) {
1821                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1822                 }
1823
1824                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1825
1826                 $id = $this->mTitle->getArticleID();
1827
1828                 if ( !$cascade ) {
1829                         $cascade = false;
1830                 }
1831
1832                 // Take this opportunity to purge out expired restrictions
1833                 Title::purgeExpiredRestrictions();
1834
1835                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1836                 # we expect a single selection, but the schema allows otherwise.
1837                 $isProtected = false;
1838                 $protect = false;
1839                 $changed = false;
1840
1841                 $dbw = wfGetDB( DB_MASTER );
1842
1843                 foreach ( $restrictionTypes as $action ) {
1844                         if ( !isset( $expiry[$action] ) ) {
1845                                 $expiry[$action] = $dbw->getInfinity();
1846                         }
1847                         if ( !isset( $limit[$action] ) ) {
1848                                 $limit[$action] = '';
1849                         } elseif ( $limit[$action] != '' ) {
1850                                 $protect = true;
1851                         }
1852
1853                         # Get current restrictions on $action
1854                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1855                         if ( $current != '' ) {
1856                                 $isProtected = true;
1857                         }
1858
1859                         if ( $limit[$action] != $current ) {
1860                                 $changed = true;
1861                         } elseif ( $limit[$action] != '' ) {
1862                                 # Only check expiry change if the action is actually being
1863                                 # protected, since expiry does nothing on an not-protected
1864                                 # action.
1865                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1866                                         $changed = true;
1867                                 }
1868                         }
1869                 }
1870
1871                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1872                         $changed = true;
1873                 }
1874
1875                 # If nothing's changed, do nothing
1876                 if ( !$changed ) {
1877                         return Status::newGood();
1878                 }
1879
1880                 if ( !$protect ) { # No protection at all means unprotection
1881                         $revCommentMsg = 'unprotectedarticle';
1882                         $logAction = 'unprotect';
1883                 } elseif ( $isProtected ) {
1884                         $revCommentMsg = 'modifiedarticleprotection';
1885                         $logAction = 'modify';
1886                 } else {
1887                         $revCommentMsg = 'protectedarticle';
1888                         $logAction = 'protect';
1889                 }
1890
1891                 $encodedExpiry = array();
1892                 $protectDescription = '';
1893                 foreach ( $limit as $action => $restrictions ) {
1894                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1895                         if ( $restrictions != '' ) {
1896                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1897                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1898                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
1899                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1900                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1901                                                 $wgContLang->time( $expiry[$action], false, false ) );
1902                                 } else {
1903                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
1904                                 }
1905
1906                                 $protectDescription .= ') ';
1907                         }
1908                 }
1909                 $protectDescription = trim( $protectDescription );
1910
1911                 if ( $id ) { # Protection of existing page
1912                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1913                                 return Status::newGood();
1914                         }
1915
1916                         # Only restrictions with the 'protect' right can cascade...
1917                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1918                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1919
1920                         # The schema allows multiple restrictions
1921                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1922                                 $cascade = false;
1923                         }
1924
1925                         # Update restrictions table
1926                         foreach ( $limit as $action => $restrictions ) {
1927                                 if ( $restrictions != '' ) {
1928                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1929                                                 array( 'pr_page' => $id,
1930                                                         'pr_type' => $action,
1931                                                         'pr_level' => $restrictions,
1932                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1933                                                         'pr_expiry' => $encodedExpiry[$action]
1934                                                 ),
1935                                                 __METHOD__
1936                                         );
1937                                 } else {
1938                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1939                                                 'pr_type' => $action ), __METHOD__ );
1940                                 }
1941                         }
1942
1943                         # Prepare a null revision to be added to the history
1944                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
1945                         if ( $reason ) {
1946                                 $editComment .= ": $reason";
1947                         }
1948                         if ( $protectDescription ) {
1949                                 $editComment .= " ($protectDescription)";
1950                         }
1951                         if ( $cascade ) {
1952                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1953                         }
1954
1955                         # Insert a null revision
1956                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1957                         $nullRevId = $nullRevision->insertOn( $dbw );
1958
1959                         $latest = $this->getLatest();
1960                         # Update page record
1961                         $dbw->update( 'page',
1962                                 array( /* SET */
1963                                         'page_touched' => $dbw->timestamp(),
1964                                         'page_restrictions' => '',
1965                                         'page_latest' => $nullRevId
1966                                 ), array( /* WHERE */
1967                                         'page_id' => $id
1968                                 ), __METHOD__
1969                         );
1970
1971                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1972                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1973                 } else { # Protection of non-existing page (also known as "title protection")
1974                         # Cascade protection is meaningless in this case
1975                         $cascade = false;
1976
1977                         if ( $limit['create'] != '' ) {
1978                                 $dbw->replace( 'protected_titles',
1979                                         array( array( 'pt_namespace', 'pt_title' ) ),
1980                                         array(
1981                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1982                                                 'pt_title' => $this->mTitle->getDBkey(),
1983                                                 'pt_create_perm' => $limit['create'],
1984                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
1985                                                 'pt_expiry' => $encodedExpiry['create'],
1986                                                 'pt_user' => $user->getId(),
1987                                                 'pt_reason' => $reason,
1988                                         ), __METHOD__
1989                                 );
1990                         } else {
1991                                 $dbw->delete( 'protected_titles',
1992                                         array(
1993                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1994                                                 'pt_title' => $this->mTitle->getDBkey()
1995                                         ), __METHOD__
1996                                 );
1997                         }
1998                 }
1999
2000                 $this->mTitle->flushRestrictions();
2001
2002                 if ( $logAction == 'unprotect' ) {
2003                         $logParams = array();
2004                 } else {
2005                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2006                 }
2007
2008                 # Update the protection log
2009                 $log = new LogPage( 'protect' );
2010                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2011
2012                 return Status::newGood();
2013         }
2014
2015         /**
2016          * Take an array of page restrictions and flatten it to a string
2017          * suitable for insertion into the page_restrictions field.
2018          * @param $limit Array
2019          * @return String
2020          */
2021         protected static function flattenRestrictions( $limit ) {
2022                 if ( !is_array( $limit ) ) {
2023                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2024                 }
2025
2026                 $bits = array();
2027                 ksort( $limit );
2028
2029                 foreach ( $limit as $action => $restrictions ) {
2030                         if ( $restrictions != '' ) {
2031                                 $bits[] = "$action=$restrictions";
2032                         }
2033                 }
2034
2035                 return implode( ':', $bits );
2036         }
2037
2038         /**
2039          * Back-end article deletion
2040          * Deletes the article with database consistency, writes logs, purges caches
2041          *
2042          * @param $reason string delete reason for deletion log
2043          * @param $suppress bitfield
2044          *      Revision::DELETED_TEXT
2045          *      Revision::DELETED_COMMENT
2046          *      Revision::DELETED_USER
2047          *      Revision::DELETED_RESTRICTED
2048          * @param $id int article ID
2049          * @param $commit boolean defaults to true, triggers transaction end
2050          * @param &$errors Array of errors to append to
2051          * @param $user User The relevant user
2052          * @return boolean true if successful
2053          */
2054         public function doDeleteArticle(
2055                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2056         ) {
2057                 global $wgUser;
2058                 $user = is_null( $user ) ? $wgUser : $user;
2059
2060                 wfDebug( __METHOD__ . "\n" );
2061
2062                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
2063                         return false;
2064                 }
2065                 $dbw = wfGetDB( DB_MASTER );
2066                 $t = $this->mTitle->getDBkey();
2067                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
2068
2069                 if ( $t === '' || $id == 0 ) {
2070                         return false;
2071                 }
2072
2073                 // Bitfields to further suppress the content
2074                 if ( $suppress ) {
2075                         $bitfield = 0;
2076                         // This should be 15...
2077                         $bitfield |= Revision::DELETED_TEXT;
2078                         $bitfield |= Revision::DELETED_COMMENT;
2079                         $bitfield |= Revision::DELETED_USER;
2080                         $bitfield |= Revision::DELETED_RESTRICTED;
2081                 } else {
2082                         $bitfield = 'rev_deleted';
2083                 }
2084
2085                 $dbw->begin();
2086                 // For now, shunt the revision data into the archive table.
2087                 // Text is *not* removed from the text table; bulk storage
2088                 // is left intact to avoid breaking block-compression or
2089                 // immutable storage schemes.
2090                 //
2091                 // For backwards compatibility, note that some older archive
2092                 // table entries will have ar_text and ar_flags fields still.
2093                 //
2094                 // In the future, we may keep revisions and mark them with
2095                 // the rev_deleted field, which is reserved for this purpose.
2096                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2097                         array(
2098                                 'ar_namespace'  => 'page_namespace',
2099                                 'ar_title'      => 'page_title',
2100                                 'ar_comment'    => 'rev_comment',
2101                                 'ar_user'       => 'rev_user',
2102                                 'ar_user_text'  => 'rev_user_text',
2103                                 'ar_timestamp'  => 'rev_timestamp',
2104                                 'ar_minor_edit' => 'rev_minor_edit',
2105                                 'ar_rev_id'     => 'rev_id',
2106                                 'ar_parent_id'  => 'rev_parent_id',
2107                                 'ar_text_id'    => 'rev_text_id',
2108                                 'ar_text'       => '\'\'', // Be explicit to appease
2109                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2110                                 'ar_len'        => 'rev_len',
2111                                 'ar_page_id'    => 'page_id',
2112                                 'ar_deleted'    => $bitfield,
2113                                 'ar_sha1'       => 'rev_content_model',
2114                                 'ar_content_format'       => 'rev_content_format',
2115                                 'ar_content_format'       => 'rev_sha1'
2116                         ), array(
2117                                 'page_id' => $id,
2118                                 'page_id = rev_page'
2119                         ), __METHOD__
2120                 );
2121
2122                 # Now that it's safely backed up, delete it
2123                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2124                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2125
2126                 if ( !$ok ) {
2127                         $dbw->rollback();
2128                         return false;
2129                 }
2130
2131                 $this->doDeleteUpdates( $id );
2132
2133                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2134                 $logtype = $suppress ? 'suppress' : 'delete';
2135
2136                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2137                 $logEntry->setPerformer( $user );
2138                 $logEntry->setTarget( $this->mTitle );
2139                 $logEntry->setComment( $reason );
2140                 $logid = $logEntry->insert();
2141                 $logEntry->publish( $logid );
2142
2143                 if ( $commit ) {
2144                         $dbw->commit();
2145                 }
2146
2147                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2148                 return true;
2149         }
2150
2151         /**
2152          * Do some database updates after deletion
2153          *
2154          * @param $id Int: page_id value of the page being deleted
2155          */
2156         public function doDeleteUpdates( $id ) {
2157                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2158
2159                 $dbw = wfGetDB( DB_MASTER );
2160
2161                 # Delete restrictions for it
2162                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2163
2164                 # Fix category table counts
2165                 $cats = array();
2166                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2167
2168                 foreach ( $res as $row ) {
2169                         $cats [] = $row->cl_to;
2170                 }
2171
2172                 $this->updateCategoryCounts( array(), $cats );
2173
2174                 # If using cascading deletes, we can skip some explicit deletes
2175                 if ( !$dbw->cascadingDeletes() ) {
2176                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2177
2178                         # Delete outgoing links
2179                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
2180                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
2181                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
2182                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
2183                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
2184                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
2185                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
2186                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
2187                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
2188                 }
2189
2190                 # If using cleanup triggers, we can skip some manual deletes
2191                 if ( !$dbw->cleanupTriggers() ) {
2192                         # Clean up recentchanges entries...
2193                         $dbw->delete( 'recentchanges',
2194                                 array( 'rc_type != ' . RC_LOG,
2195                                         'rc_namespace' => $this->mTitle->getNamespace(),
2196                                         'rc_title' => $this->mTitle->getDBkey() ),
2197                                 __METHOD__ );
2198                         $dbw->delete( 'recentchanges',
2199                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2200                                 __METHOD__ );
2201                 }
2202
2203                 # Clear caches
2204                 self::onArticleDelete( $this->mTitle );
2205
2206                 # Clear the cached article id so the interface doesn't act like we exist
2207                 $this->mTitle->resetArticleID( 0 );
2208         }
2209
2210         /**
2211          * Roll back the most recent consecutive set of edits to a page
2212          * from the same user; fails if there are no eligible edits to
2213          * roll back to, e.g. user is the sole contributor. This function
2214          * performs permissions checks on $user, then calls commitRollback()
2215          * to do the dirty work
2216          *
2217          * @todo: seperate the business/permission stuff out from backend code
2218          *
2219          * @param $fromP String: Name of the user whose edits to rollback.
2220          * @param $summary String: Custom summary. Set to default summary if empty.
2221          * @param $token String: Rollback token.
2222          * @param $bot Boolean: If true, mark all reverted edits as bot.
2223          *
2224          * @param $resultDetails Array: contains result-specific array of additional values
2225          *    'alreadyrolled' : 'current' (rev)
2226          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2227          *
2228          * @param $user User The user performing the rollback
2229          * @return array of errors, each error formatted as
2230          *   array(messagekey, param1, param2, ...).
2231          * On success, the array is empty.  This array can also be passed to
2232          * OutputPage::showPermissionsErrorPage().
2233          */
2234         public function doRollback(
2235                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2236         ) {
2237                 $resultDetails = null;
2238
2239                 # Check permissions
2240                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2241                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2242                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2243
2244                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2245                         $errors[] = array( 'sessionfailure' );
2246                 }
2247
2248                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2249                         $errors[] = array( 'actionthrottledtext' );
2250                 }
2251
2252                 # If there were errors, bail out now
2253                 if ( !empty( $errors ) ) {
2254                         return $errors;
2255                 }
2256
2257                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2258         }
2259
2260         /**
2261          * Backend implementation of doRollback(), please refer there for parameter
2262          * and return value documentation
2263          *
2264          * NOTE: This function does NOT check ANY permissions, it just commits the
2265          * rollback to the DB. Therefore, you should only call this function direct-
2266          * ly if you want to use custom permissions checks. If you don't, use
2267          * doRollback() instead.
2268          * @param $fromP String: Name of the user whose edits to rollback.
2269          * @param $summary String: Custom summary. Set to default summary if empty.
2270          * @param $bot Boolean: If true, mark all reverted edits as bot.
2271          *
2272          * @param $resultDetails Array: contains result-specific array of additional values
2273          * @param $guser User The user performing the rollback
2274          */
2275         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2276                 global $wgUseRCPatrol, $wgContLang;
2277
2278                 $dbw = wfGetDB( DB_MASTER );
2279
2280                 if ( wfReadOnly() ) {
2281                         return array( array( 'readonlytext' ) );
2282                 }
2283
2284                 # Get the last editor
2285                 $current = Revision::newFromTitle( $this->mTitle );
2286                 if ( is_null( $current ) ) {
2287                         # Something wrong... no page?
2288                         return array( array( 'notanarticle' ) );
2289                 }
2290
2291                 $from = str_replace( '_', ' ', $fromP );
2292                 # User name given should match up with the top revision.
2293                 # If the user was deleted then $from should be empty.
2294                 if ( $from != $current->getUserText() ) {
2295                         $resultDetails = array( 'current' => $current );
2296                         return array( array( 'alreadyrolled',
2297                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2298                                 htmlspecialchars( $fromP ),
2299                                 htmlspecialchars( $current->getUserText() )
2300                         ) );
2301                 }
2302
2303                 # Get the last edit not by this guy...
2304                 # Note: these may not be public values
2305                 $user = intval( $current->getRawUser() );
2306                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2307                 $s = $dbw->selectRow( 'revision',
2308                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2309                         array( 'rev_page' => $current->getPage(),
2310                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2311                         ), __METHOD__,
2312                         array( 'USE INDEX' => 'page_timestamp',
2313                                 'ORDER BY' => 'rev_timestamp DESC' )
2314                         );
2315                 if ( $s === false ) {
2316                         # No one else ever edited this page
2317                         return array( array( 'cantrollback' ) );
2318                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2319                         # Only admins can see this text
2320                         return array( array( 'notvisiblerev' ) );
2321                 }
2322
2323                 $set = array();
2324                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2325                         # Mark all reverted edits as bot
2326                         $set['rc_bot'] = 1;
2327                 }
2328
2329                 if ( $wgUseRCPatrol ) {
2330                         # Mark all reverted edits as patrolled
2331                         $set['rc_patrolled'] = 1;
2332                 }
2333
2334                 if ( count( $set ) ) {
2335                         $dbw->update( 'recentchanges', $set,
2336                                 array( /* WHERE */
2337                                         'rc_cur_id' => $current->getPage(),
2338                                         'rc_user_text' => $current->getUserText(),
2339                                         "rc_timestamp > '{$s->rev_timestamp}'",
2340                                 ), __METHOD__
2341                         );
2342                 }
2343
2344                 # Generate the edit summary if necessary
2345                 $target = Revision::newFromId( $s->rev_id );
2346                 if ( empty( $summary ) ) {
2347                         if ( $from == '' ) { // no public user name
2348                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2349                         } else {
2350                                 $summary = wfMsgForContent( 'revertpage' );
2351                         }
2352                 }
2353
2354                 # Allow the custom summary to use the same args as the default message
2355                 $args = array(
2356                         $target->getUserText(), $from, $s->rev_id,
2357                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2358                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2359                 );
2360                 $summary = wfMsgReplaceArgs( $summary, $args );
2361
2362                 # Save
2363                 $flags = EDIT_UPDATE;
2364
2365                 if ( $guser->isAllowed( 'minoredit' ) ) {
2366                         $flags |= EDIT_MINOR;
2367                 }
2368
2369                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2370                         $flags |= EDIT_FORCE_BOT;
2371                 }
2372
2373                 # Actually store the edit
2374                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId(), $guser );
2375                 if ( !empty( $status->value['revision'] ) ) {
2376                         $revId = $status->value['revision']->getId();
2377                 } else {
2378                         $revId = false;
2379                 }
2380
2381                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2382
2383                 $resultDetails = array(
2384                         'summary' => $summary,
2385                         'current' => $current,
2386                         'target'  => $target,
2387                         'newid'   => $revId
2388                 );
2389
2390                 return array();
2391         }
2392
2393         /**
2394          * The onArticle*() functions are supposed to be a kind of hooks
2395          * which should be called whenever any of the specified actions
2396          * are done.
2397          *
2398          * This is a good place to put code to clear caches, for instance.
2399          *
2400          * This is called on page move and undelete, as well as edit
2401          *
2402          * @param $title Title object
2403          */
2404         public static function onArticleCreate( $title ) {
2405                 # Update existence markers on article/talk tabs...
2406                 if ( $title->isTalkPage() ) {
2407                         $other = $title->getSubjectPage();
2408                 } else {
2409                         $other = $title->getTalkPage();
2410                 }
2411
2412                 $other->invalidateCache();
2413                 $other->purgeSquid();
2414
2415                 $title->touchLinks();
2416                 $title->purgeSquid();
2417                 $title->deleteTitleProtection();
2418         }
2419
2420         /**
2421          * Clears caches when article is deleted
2422          *
2423          * @param $title Title
2424          */
2425         public static function onArticleDelete( $title ) {
2426                 # Update existence markers on article/talk tabs...
2427                 if ( $title->isTalkPage() ) {
2428                         $other = $title->getSubjectPage();
2429                 } else {
2430                         $other = $title->getTalkPage();
2431                 }
2432
2433                 $other->invalidateCache();
2434                 $other->purgeSquid();
2435
2436                 $title->touchLinks();
2437                 $title->purgeSquid();
2438
2439                 # File cache
2440                 HTMLFileCache::clearFileCache( $title );
2441
2442                 # Messages
2443                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2444                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2445                 }
2446
2447                 # Images
2448                 if ( $title->getNamespace() == NS_FILE ) {
2449                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2450                         $update->doUpdate();
2451                 }
2452
2453                 # User talk pages
2454                 if ( $title->getNamespace() == NS_USER_TALK ) {
2455                         $user = User::newFromName( $title->getText(), false );
2456                         if ( $user ) {
2457                                 $user->setNewtalk( false );
2458                         }
2459                 }
2460
2461                 # Image redirects
2462                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2463         }
2464
2465         /**
2466          * Purge caches on page update etc
2467          *
2468          * @param $title Title object
2469          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2470          */
2471         public static function onArticleEdit( $title ) {
2472                 // Invalidate caches of articles which include this page
2473                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2474
2475
2476                 // Invalidate the caches of all pages which redirect here
2477                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2478
2479                 # Purge squid for this page only
2480                 $title->purgeSquid();
2481
2482                 # Clear file cache for this page only
2483                 HTMLFileCache::clearFileCache( $title );
2484         }
2485
2486         /**#@-*/
2487
2488         /**
2489          * Returns a list of hidden categories this page is a member of.
2490          * Uses the page_props and categorylinks tables.
2491          *
2492          * @return Array of Title objects
2493          */
2494         public function getHiddenCategories() {
2495                 $result = array();
2496                 $id = $this->mTitle->getArticleID();
2497
2498                 if ( $id == 0 ) {
2499                         return array();
2500                 }
2501
2502                 $dbr = wfGetDB( DB_SLAVE );
2503                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2504                         array( 'cl_to' ),
2505                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2506                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2507                         __METHOD__ );
2508
2509                 if ( $res !== false ) {
2510                         foreach ( $res as $row ) {
2511                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2512                         }
2513                 }
2514
2515                 return $result;
2516         }
2517
2518         /**
2519         * Return an applicable autosummary if one exists for the given edit.
2520         * @param $oldtext String: the previous text of the page.
2521         * @param $newtext String: The submitted text of the page.
2522         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2523         * @return string An appropriate autosummary, or an empty string.
2524     * @deprecated since 1.20, use ContentHandler::getAutosummary() instead
2525         */
2526         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2527                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2528
2529         $handler = ContentHandler::getForModelName( CONTENT_MODEL_WIKITEXT );
2530         $oldContent = $handler->unserialize( $oldtext );
2531         $newContent = $handler->unserialize( $newtext );
2532
2533         return $handler->getAutosummary( $oldContent, $newContent, $flags );
2534         }
2535
2536         /**
2537          * Auto-generates a deletion reason
2538          *
2539          * @param &$hasHistory Boolean: whether the page has a history
2540          * @return mixed String containing deletion reason or empty string, or boolean false
2541          *    if no revision occurred
2542      * @deprecated since 1.20, use ContentHandler::getAutoDeleteReason() instead
2543          */
2544         public function getAutoDeleteReason( &$hasHistory ) {
2545         #NOTE: stub for backwards-compatibility.
2546
2547                 $handler = ContentHandler::getForTitle( $this->getTitle() );
2548         $handler->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2549         }
2550
2551         /**
2552          * Update all the appropriate counts in the category table, given that
2553          * we've added the categories $added and deleted the categories $deleted.
2554          *
2555          * @param $added array   The names of categories that were added
2556          * @param $deleted array The names of categories that were deleted
2557          */
2558         public function updateCategoryCounts( $added, $deleted ) {
2559                 $ns = $this->mTitle->getNamespace();
2560                 $dbw = wfGetDB( DB_MASTER );
2561
2562                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2563                 # exist, we might legitimately not create it, but it's simpler to just
2564                 # create it and then give it a negative value, since the value is bogus
2565                 # anyway.
2566                 #
2567                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2568                 $insertCats = array_merge( $added, $deleted );
2569                 if ( !$insertCats ) {
2570                         # Okay, nothing to do
2571                         return;
2572                 }
2573
2574                 $insertRows = array();
2575
2576                 foreach ( $insertCats as $cat ) {
2577                         $insertRows[] = array(
2578                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2579                                 'cat_title' => $cat
2580                         );
2581                 }
2582                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2583
2584                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2585                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2586
2587                 if ( $ns == NS_CATEGORY ) {
2588                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2589                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2590                 } elseif ( $ns == NS_FILE ) {
2591                         $addFields[]    = 'cat_files = cat_files + 1';
2592                         $removeFields[] = 'cat_files = cat_files - 1';
2593                 }
2594
2595                 if ( $added ) {
2596                         $dbw->update(
2597                                 'category',
2598                                 $addFields,
2599                                 array( 'cat_title' => $added ),
2600                                 __METHOD__
2601                         );
2602                 }
2603
2604                 if ( $deleted ) {
2605                         $dbw->update(
2606                                 'category',
2607                                 $removeFields,
2608                                 array( 'cat_title' => $deleted ),
2609                                 __METHOD__
2610                         );
2611                 }
2612         }
2613
2614         /**
2615          * Updates cascading protections
2616          *
2617          * @param $parserOutput ParserOutput object for the current version
2618          */
2619         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2620                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2621                         return;
2622                 }
2623
2624                 // templatelinks table may have become out of sync,
2625                 // especially if using variable-based transclusions.
2626                 // For paranoia, check if things have changed and if
2627                 // so apply updates to the database. This will ensure
2628                 // that cascaded protections apply as soon as the changes
2629                 // are visible.
2630
2631                 # Get templates from templatelinks
2632                 $id = $this->mTitle->getArticleID();
2633
2634                 $tlTemplates = array();
2635
2636                 $dbr = wfGetDB( DB_SLAVE );
2637                 $res = $dbr->select( array( 'templatelinks' ),
2638                         array( 'tl_namespace', 'tl_title' ),
2639                         array( 'tl_from' => $id ),
2640                         __METHOD__
2641                 );
2642
2643                 foreach ( $res as $row ) {
2644                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2645                 }
2646
2647                 # Get templates from parser output.
2648                 $poTemplates = array();
2649                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2650                         foreach ( $templates as $dbk => $id ) {
2651                                 $poTemplates["$ns:$dbk"] = true;
2652                         }
2653                 }
2654
2655                 # Get the diff
2656                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2657
2658                 if ( count( $templates_diff ) > 0 ) {
2659                         # Whee, link updates time.
2660                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2661                         $u->doUpdate();
2662                 }
2663         }
2664
2665         /**
2666          * Return a list of templates used by this article.
2667          * Uses the templatelinks table
2668          *
2669          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2670          * @return Array of Title objects
2671          */
2672         public function getUsedTemplates() {
2673                 return $this->mTitle->getTemplateLinksFrom();
2674         }
2675
2676         /**
2677          * Perform article updates on a special page creation.
2678          *
2679          * @param $rev Revision object
2680          *
2681          * @todo This is a shitty interface function. Kill it and replace the
2682          * other shitty functions like doEditUpdates and such so it's not needed
2683          * anymore.
2684          * @deprecated since 1.18, use doEditUpdates()
2685          */
2686         public function createUpdates( $rev ) {
2687                 wfDeprecated( __METHOD__, '1.18' );
2688                 global $wgUser;
2689                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2690         }
2691
2692         /**
2693          * This function is called right before saving the wikitext,
2694          * so we can do things like signatures and links-in-context.
2695          *
2696          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2697          * @param $text String article contents
2698          * @param $user User object: user doing the edit
2699          * @param $popts ParserOptions object: parser options, default options for
2700          *               the user loaded if null given
2701          * @return string article contents with altered wikitext markup (signatures
2702          *      converted, {{subst:}}, templates, etc.)
2703          */
2704         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2705                 global $wgParser, $wgUser;
2706
2707                 wfDeprecated( __METHOD__, '1.19' );
2708
2709                 $user = is_null( $user ) ? $wgUser : $user;
2710
2711                 if ( $popts === null ) {
2712                         $popts = ParserOptions::newFromUser( $user );
2713                 }
2714
2715                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2716         }
2717
2718         /**
2719          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2720          *
2721          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2722          * @return bool
2723          */
2724         public function isBigDeletion() {
2725                 wfDeprecated( __METHOD__, '1.19' );
2726                 return $this->mTitle->isBigDeletion();
2727         }
2728
2729         /**
2730          * Get the  approximate revision count of this page.
2731          *
2732          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2733          * @return int
2734          */
2735         public function estimateRevisionCount() {
2736                 wfDeprecated( __METHOD__, '1.19' );
2737                 return $this->mTitle->estimateRevisionCount();
2738         }
2739
2740         /**
2741          * Update the article's restriction field, and leave a log entry.
2742          *
2743          * @deprecated since 1.19
2744          * @param $limit Array: set of restriction keys
2745          * @param $reason String
2746          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2747          * @param $expiry Array: per restriction type expiration
2748          * @param $user User The user updating the restrictions
2749          * @return bool true on success
2750          */
2751         public function updateRestrictions(
2752                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2753         ) {
2754                 global $wgUser;
2755
2756                 $user = is_null( $user ) ? $wgUser : $user;
2757
2758                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2759         }
2760
2761         /**
2762          * @deprecated since 1.18
2763          */
2764         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2765                 wfDeprecated( __METHOD__, '1.18' );
2766                 global $wgUser;
2767                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2768         }
2769
2770         /**
2771          * @deprecated since 1.18
2772          */
2773         public function viewUpdates() {
2774                 wfDeprecated( __METHOD__, '1.18' );
2775                 global $wgUser;
2776                 return $this->doViewUpdates( $wgUser );
2777         }
2778
2779         /**
2780          * @deprecated since 1.18
2781          */
2782         public function useParserCache( $oldid ) {
2783                 wfDeprecated( __METHOD__, '1.18' );
2784                 global $wgUser;
2785                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2786         }
2787 }
2788
2789 class PoolWorkArticleView extends PoolCounterWork {
2790
2791         /**
2792          * @var Page
2793          */
2794         private $page;
2795
2796         /**
2797          * @var string
2798          */
2799         private $cacheKey;
2800
2801         /**
2802          * @var integer
2803          */
2804         private $revid;
2805
2806         /**
2807          * @var ParserOptions
2808          */
2809         private $parserOptions;
2810
2811         /**
2812          * @var string|null
2813          */
2814         private $text;
2815
2816         /**
2817          * @var ParserOutput|false
2818          */
2819         private $parserOutput = false;
2820
2821         /**
2822          * @var bool
2823          */
2824         private $isDirty = false;
2825
2826         /**
2827          * @var Status|false
2828          */
2829         private $error = false;
2830
2831         /**
2832          * Constructor
2833          *
2834          * @param $page Page
2835          * @param $revid Integer: ID of the revision being parsed
2836          * @param $useParserCache Boolean: whether to use the parser cache
2837          * @param $parserOptions parserOptions to use for the parse operation
2838          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
2839          */
2840         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
2841         if ( is_string($content) ) { #BC: old style call
2842             $modelName = $page->getRevision()->getContentModelName();
2843             $format = $page->getRevision()->getContentFormat();
2844             $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelName, $format );
2845         }
2846
2847                 $this->page = $page;
2848                 $this->revid = $revid;
2849                 $this->cacheable = $useParserCache;
2850                 $this->parserOptions = $parserOptions;
2851                 $this->content = $content;
2852                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
2853                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
2854         }
2855
2856         /**
2857          * Get the ParserOutput from this object, or false in case of failure
2858          *
2859          * @return ParserOutput
2860          */
2861         public function getParserOutput() {
2862                 return $this->parserOutput;
2863         }
2864
2865         /**
2866          * Get whether the ParserOutput is a dirty one (i.e. expired)
2867          *
2868          * @return bool
2869          */
2870         public function getIsDirty() {
2871                 return $this->isDirty;
2872         }
2873
2874         /**
2875          * Get a Status object in case of error or false otherwise
2876          *
2877          * @return Status|false
2878          */
2879         public function getError() {
2880                 return $this->error;
2881         }
2882
2883         /**
2884          * @return bool
2885          */
2886         function doWork() {
2887                 global $wgParser, $wgUseFileCache;
2888
2889                 $isCurrent = $this->revid === $this->page->getLatest();
2890
2891                 if ( $this->content !== null ) {
2892                         $content = $this->content;
2893                 } elseif ( $isCurrent ) {
2894             $content = $this->page->getContent( Revision::RAW ); #XXX: why use RAW audience here, and PUBLIC (default) below?
2895                 } else {
2896                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
2897                         if ( $rev === null ) {
2898                                 return false;
2899                         }
2900             $content = $rev->getContent(); #XXX: why use PUBLIC audience here (default), and RAW above?
2901                 }
2902
2903                 $time = - wfTime();
2904                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
2905                 $time += wfTime();
2906
2907                 # Timing hack
2908                 if ( $time > 3 ) {
2909                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
2910                                 $this->page->getTitle()->getPrefixedDBkey() ) );
2911                 }
2912
2913                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
2914                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
2915                 }
2916
2917                 // Make sure file cache is not used on uncacheable content.
2918                 // Output that has magic words in it can still use the parser cache
2919                 // (if enabled), though it will generally expire sooner.
2920                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
2921                         $wgUseFileCache = false;
2922                 }
2923
2924                 if ( $isCurrent ) {
2925                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
2926                 }
2927
2928                 return true;
2929         }
2930
2931         /**
2932          * @return bool
2933          */
2934         function getCachedWork() {
2935                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
2936
2937                 if ( $this->parserOutput === false ) {
2938                         wfDebug( __METHOD__ . ": parser cache miss\n" );
2939                         return false;
2940                 } else {
2941                         wfDebug( __METHOD__ . ": parser cache hit\n" );
2942                         return true;
2943                 }
2944         }
2945
2946         /**
2947          * @return bool
2948          */
2949         function fallback() {
2950                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
2951
2952                 if ( $this->parserOutput === false ) {
2953                         wfDebugLog( 'dirty', "dirty missing\n" );
2954                         wfDebug( __METHOD__ . ": no dirty cache\n" );
2955                         return false;
2956                 } else {
2957                         wfDebug( __METHOD__ . ": sending dirty output\n" );
2958                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
2959                         $this->isDirty = true;
2960                         return true;
2961                 }
2962         }
2963
2964         /**
2965          * @param $status Status
2966          */
2967         function error( $status ) {
2968                 $this->error = $status;
2969                 return false;
2970         }
2971 }