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 ( $text === false ) {
 304                         if ( !$this->mDataLoaded ) {
 305                                 $this->loadPageData();
 306                         }
 307
 308                         return (bool)$this->mIsRedirect;
 309                 } else {
 310                         return Title::newFromRedirect( $text ) !== null;
 311                 }
 312         }
 313
 314         /**
 315          * Loads page_touched and returns a value indicating if it should be used
 316          * @return boolean true if not a redirect
 317          */
 318         public function checkTouched() {
 319                 if ( !$this->mDataLoaded ) {
 320                         $this->loadPageData();
 321                 }
 322                 return !$this->mIsRedirect;
 323         }
 324
 325         /**
 326          * Get the page_touched field
 327          * @return string containing GMT timestamp
 328          */
 329         public function getTouched() {
 330                 if ( !$this->mDataLoaded ) {
 331                         $this->loadPageData();
 332                 }
 333                 return $this->mTouched;
 334         }
 335
 336         /**
 337          * Get the page_latest field
 338          * @return integer rev_id of current revision
 339          */
 340         public function getLatest() {
 341                 if ( !$this->mDataLoaded ) {
 342                         $this->loadPageData();
 343                 }
 344                 return (int)$this->mLatest;
 345         }
 346
 347         /**
 348          * Loads everything except the text
 349          * This isn't necessary for all uses, so it's only done if needed.
 350          */
 351         protected function loadLastEdit() {
 352                 if ( $this->mLastRevision !== null ) {
 353                         return; // already loaded
 354                 }
 355
 356                 $latest = $this->getLatest();
 357                 if ( !$latest ) {
 358                         return; // page doesn't exist or is missing page_latest info
 359                 }
 360
 361                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 362                 if ( $revision ) { // sanity
 363                         $this->setLastEdit( $revision );
 364                 }
 365         }
 366
 367         /**
 368          * Set the latest revision
 369          */
 370         protected function setLastEdit( Revision $revision ) {
 371                 $this->mLastRevision = $revision;
 372                 $this->mTimestamp = $revision->getTimestamp();
 373         }
 374
 375         /**
 376          * Get the latest revision
 377          * @return Revision|null
 378          */
 379         public function getRevision() {
 380                 $this->loadLastEdit();
 381                 if ( $this->mLastRevision ) {
 382                         return $this->mLastRevision;
 383                 }
 384                 return null;
 385         }
 386
 387     /**
 388      * Get the content of the current revision. No side-effects...
 389      *
 390      * @param $audience Integer: one of:
 391      *      Revision::FOR_PUBLIC       to be displayed to all users
 392      *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 393      *      Revision::RAW              get the text regardless of permissions
 394      * @return String|null The content of the current revision
 395      */
 396     public function getContent( $audience = Revision::FOR_PUBLIC ) {
 397         $this->loadLastEdit();
 398         if ( $this->mLastRevision ) {
 399             return $this->mLastRevision->getContent( $audience );
 400         }
 401         return false;
 402     }
 403
 404         /**
 405          * Get the text of the current revision. No side-effects...
 406          *
 407          * @param $audience Integer: one of:
 408          *      Revision::FOR_PUBLIC       to be displayed to all users
 409          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 410          *      Revision::RAW              get the text regardless of permissions
 411          * @return String|false The text of the current revision
 412      * @deprecated as of 1.20, getContent() should be used instead.
 413          */
 414         public function getText( $audience = Revision::FOR_PUBLIC ) { #FIXME: deprecated, replace usage!
 415         wfDeprecated( __METHOD__, '1.20' );
 416                 $this->loadLastEdit();
 417                 if ( $this->mLastRevision ) {
 418                         return $this->mLastRevision->getText( $audience );
 419                 }
 420                 return false;
 421         }
 422
 423         /**
 424          * Get the text of the current revision. No side-effects...
 425          *
 426          * @return String|false The text of the current revision
 427          */
 428         public function getRawText() { #FIXME: deprecated, replace usage!
 429                 return $this->getText( Revision::RAW );
 430         }
 431
 432     protected function getRawData() {
 433         $content = $this->getContent( Revision::RAW );
 434         return $content->getRawData();
 435     }
 436
 437         /**
 438          * @return string MW timestamp of last article revision
 439          */
 440         public function getTimestamp() {
 441                 // Check if the field has been filled by WikiPage::setTimestamp()
 442                 if ( !$this->mTimestamp ) {
 443                         $this->loadLastEdit();
 444                 }
 445                 return wfTimestamp( TS_MW, $this->mTimestamp );
 446         }
 447
 448         /**
 449          * Set the page timestamp (use only to avoid DB queries)
 450          * @param $ts string MW timestamp of last article revision
 451          * @return void
 452          */
 453         public function setTimestamp( $ts ) {
 454                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 455         }
 456
 457         /**
 458          * @param $audience Integer: one of:
 459          *      Revision::FOR_PUBLIC       to be displayed to all users
 460          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 461          *      Revision::RAW              get the text regardless of permissions
 462          * @return int user ID for the user that made the last article revision
 463          */
 464         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 465                 $this->loadLastEdit();
 466                 if ( $this->mLastRevision ) {
 467                         return $this->mLastRevision->getUser( $audience );
 468                 } else {
 469                         return -1;
 470                 }
 471         }
 472
 473         /**
 474          * @param $audience Integer: one of:
 475          *      Revision::FOR_PUBLIC       to be displayed to all users
 476          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 477          *      Revision::RAW              get the text regardless of permissions
 478          * @return string username of the user that made the last article revision
 479          */
 480         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 481                 $this->loadLastEdit();
 482                 if ( $this->mLastRevision ) {
 483                         return $this->mLastRevision->getUserText( $audience );
 484                 } else {
 485                         return '';
 486                 }
 487         }
 488
 489         /**
 490          * @param $audience Integer: one of:
 491          *      Revision::FOR_PUBLIC       to be displayed to all users
 492          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 493          *      Revision::RAW              get the text regardless of permissions
 494          * @return string Comment stored for the last article revision
 495          */
 496         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 497                 $this->loadLastEdit();
 498                 if ( $this->mLastRevision ) {
 499                         return $this->mLastRevision->getComment( $audience );
 500                 } else {
 501                         return '';
 502                 }
 503         }
 504
 505         /**
 506          * Returns true if last revision was marked as "minor edit"
 507          *
 508          * @return boolean Minor edit indicator for the last article revision.
 509          */
 510         public function getMinorEdit() {
 511                 $this->loadLastEdit();
 512                 if ( $this->mLastRevision ) {
 513                         return $this->mLastRevision->isMinor();
 514                 } else {
 515                         return false;
 516                 }
 517         }
 518
 519         /**
 520          * Get the cached timestamp for the last time the page changed.
 521          * This is only used to help handle slave lag by comparing to page_touched.
 522          * @return string MW timestamp
 523          */
 524         protected function getCachedLastEditTime() {
 525                 global $wgMemc;
 526                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 527                 return $wgMemc->get( $key );
 528         }
 529
 530         /**
 531          * Set the cached timestamp for the last time the page changed.
 532          * This is only used to help handle slave lag by comparing to page_touched.
 533          * @param $timestamp string
 534          * @return void
 535          */
 536         public function setCachedLastEditTime( $timestamp ) {
 537                 global $wgMemc;
 538                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 539                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 540         }
 541
 542         /**
 543          * Determine whether a page would be suitable for being counted as an
 544          * article in the site_stats table based on the title & its content
 545          *
 546          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 547          *        if false, the current database state will be used
 548          * @return Boolean
 549          */
 550         public function isCountable( $editInfo = false ) { #FIXME: move this to Content object
 551                 global $wgArticleCountMethod;
 552
 553                 if ( !$this->mTitle->isContentPage() ) {
 554                         return false;
 555                 }
 556
 557                 $text = $editInfo ? $editInfo->pst : false;
 558
 559                 if ( $this->isRedirect( $text ) ) {
 560                         return false;
 561                 }
 562
 563                 switch ( $wgArticleCountMethod ) {
 564                 case 'any':
 565                         return true;
 566                 case 'comma':
 567                         if ( $text === false ) {
 568                                 $text = $this->getRawText();
 569                         }
 570                         return strpos( $text,  ',' ) !== false;
 571                 case 'link':
 572                         if ( $editInfo ) {
 573                                 // ParserOutput::getLinks() is a 2D array of page links, so
 574                                 // to be really correct we would need to recurse in the array
 575                                 // but the main array should only have items in it if there are
 576                                 // links.
 577                                 return (bool)count( $editInfo->output->getLinks() );
 578                         } else {
 579                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 580                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 581                         }
 582                 }
 583         }
 584
 585         /**
 586          * If this page is a redirect, get its target
 587          *
 588          * The target will be fetched from the redirect table if possible.
 589          * If this page doesn't have an entry there, call insertRedirect()
 590          * @return Title|mixed object, or null if this page is not a redirect
 591          */
 592         public function getRedirectTarget() {
 593                 if ( !$this->mTitle->isRedirect() ) {
 594                         return null;
 595                 }
 596
 597                 if ( $this->mRedirectTarget !== null ) {
 598                         return $this->mRedirectTarget;
 599                 }
 600
 601                 # Query the redirect table
 602                 $dbr = wfGetDB( DB_SLAVE );
 603                 $row = $dbr->selectRow( 'redirect',
 604                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 605                         array( 'rd_from' => $this->getId() ),
 606                         __METHOD__
 607                 );
 608
 609                 // rd_fragment and rd_interwiki were added later, populate them if empty
 610                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 611                         return $this->mRedirectTarget = Title::makeTitle(
 612                                 $row->rd_namespace, $row->rd_title,
 613                                 $row->rd_fragment, $row->rd_interwiki );
 614                 }
 615
 616                 # This page doesn't have an entry in the redirect table
 617                 return $this->mRedirectTarget = $this->insertRedirect();
 618         }
 619
 620         /**
 621          * Insert an entry for this page into the redirect table.
 622          *
 623          * Don't call this function directly unless you know what you're doing.
 624          * @return Title object or null if not a redirect
 625          */
 626         public function insertRedirect() {
 627                 // recurse through to only get the final target
 628                 $retval = Title::newFromRedirectRecurse( $this->getRawText() ); #FIXME: move this to Content object
 629                 if ( !$retval ) {
 630                         return null;
 631                 }
 632                 $this->insertRedirectEntry( $retval );
 633                 return $retval;
 634         }
 635
 636         /**
 637          * Insert or update the redirect table entry for this page to indicate
 638          * it redirects to $rt .
 639          * @param $rt Title redirect target
 640          */
 641         public function insertRedirectEntry( $rt ) {
 642                 $dbw = wfGetDB( DB_MASTER );
 643                 $dbw->replace( 'redirect', array( 'rd_from' ),
 644                         array(
 645                                 'rd_from'      => $this->getId(),
 646                                 'rd_namespace' => $rt->getNamespace(),
 647                                 'rd_title'     => $rt->getDBkey(),
 648                                 'rd_fragment'  => $rt->getFragment(),
 649                                 'rd_interwiki' => $rt->getInterwiki(),
 650                         ),
 651                         __METHOD__
 652                 );
 653         }
 654
 655         /**
 656          * Get the Title object or URL this page redirects to
 657          *
 658          * @return mixed false, Title of in-wiki target, or string with URL
 659          */
 660         public function followRedirect() {
 661                 return $this->getRedirectURL( $this->getRedirectTarget() );
 662         }
 663
 664         /**
 665          * Get the Title object or URL to use for a redirect. We use Title
 666          * objects for same-wiki, non-special redirects and URLs for everything
 667          * else.
 668          * @param $rt Title Redirect target
 669          * @return mixed false, Title object of local target, or string with URL
 670          */
 671         public function getRedirectURL( $rt ) {
 672                 if ( !$rt ) {
 673                         return false;
 674                 }
 675
 676                 if ( $rt->isExternal() ) {
 677                         if ( $rt->isLocal() ) {
 678                                 // Offsite wikis need an HTTP redirect.
 679                                 //
 680                                 // This can be hard to reverse and may produce loops,
 681                                 // so they may be disabled in the site configuration.
 682                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 683                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 684                         } else {
 685                                 // External pages pages without "local" bit set are not valid
 686                                 // redirect targets
 687                                 return false;
 688                         }
 689                 }
 690
 691                 if ( $rt->isSpecialPage() ) {
 692                         // Gotta handle redirects to special pages differently:
 693                         // Fill the HTTP response "Location" header and ignore
 694                         // the rest of the page we're on.
 695                         //
 696                         // Some pages are not valid targets
 697                         if ( $rt->isValidRedirectTarget() ) {
 698                                 return $rt->getFullURL();
 699                         } else {
 700                                 return false;
 701                         }
 702                 }
 703
 704                 return $rt;
 705         }
 706
 707         /**
 708          * Get a list of users who have edited this article, not including the user who made
 709          * the most recent revision, which you can get from $article->getUser() if you want it
 710          * @return UserArrayFromResult
 711          */
 712         public function getContributors() {
 713                 # @todo FIXME: This is expensive; cache this info somewhere.
 714
 715                 $dbr = wfGetDB( DB_SLAVE );
 716
 717                 if ( $dbr->implicitGroupby() ) {
 718                         $realNameField = 'user_real_name';
 719                 } else {
 720                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 721                 }
 722
 723                 $tables = array( 'revision', 'user' );
 724
 725                 $fields = array(
 726                         'rev_user as user_id',
 727                         'rev_user_text AS user_name',
 728                         $realNameField,
 729                         'MAX(rev_timestamp) AS timestamp',
 730                 );
 731
 732                 $conds = array( 'rev_page' => $this->getId() );
 733
 734                 // The user who made the top revision gets credited as "this page was last edited by
 735                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 736                 $user = $this->getUser();
 737                 if ( $user ) {
 738                         $conds[] = "rev_user != $user";
 739                 } else {
 740                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 741                 }
 742
 743                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 744
 745                 $jconds = array(
 746                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 747                 );
 748
 749                 $options = array(
 750                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 751                         'ORDER BY' => 'timestamp DESC',
 752                 );
 753
 754                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 755                 return new UserArrayFromResult( $res );
 756         }
 757
 758         /**
 759          * Get the last N authors
 760          * @param $num Integer: number of revisions to get
 761          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 762          * @return array Array of authors, duplicates not removed
 763          */
 764         public function getLastNAuthors( $num, $revLatest = 0 ) {
 765                 wfProfileIn( __METHOD__ );
 766                 // First try the slave
 767                 // If that doesn't have the latest revision, try the master
 768                 $continue = 2;
 769                 $db = wfGetDB( DB_SLAVE );
 770
 771                 do {
 772                         $res = $db->select( array( 'page', 'revision' ),
 773                                 array( 'rev_id', 'rev_user_text' ),
 774                                 array(
 775                                         'page_namespace' => $this->mTitle->getNamespace(),
 776                                         'page_title' => $this->mTitle->getDBkey(),
 777                                         'rev_page = page_id'
 778                                 ), __METHOD__,
 779                                 array(
 780                                         'ORDER BY' => 'rev_timestamp DESC',
 781                                         'LIMIT' => $num
 782                                 )
 783                         );
 784
 785                         if ( !$res ) {
 786                                 wfProfileOut( __METHOD__ );
 787                                 return array();
 788                         }
 789
 790                         $row = $db->fetchObject( $res );
 791
 792                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 793                                 $db = wfGetDB( DB_MASTER );
 794                                 $continue--;
 795                         } else {
 796                                 $continue = 0;
 797                         }
 798                 } while ( $continue );
 799
 800                 $authors = array( $row->rev_user_text );
 801
 802                 foreach ( $res as $row ) {
 803                         $authors[] = $row->rev_user_text;
 804                 }
 805
 806                 wfProfileOut( __METHOD__ );
 807                 return $authors;
 808         }
 809
 810         /**
 811          * Should the parser cache be used?
 812          *
 813          * @param $parserOptions ParserOptions to check
 814          * @param $oldid int
 815          * @return boolean
 816          */
 817         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 818                 global $wgEnableParserCache;
 819
 820                 return $wgEnableParserCache
 821                         && $parserOptions->getStubThreshold() == 0
 822                         && $this->mTitle->exists()
 823                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 824                         && $this->mTitle->isWikitextPage(); #FIXME: ask ContentHandler if cachable!
 825         }
 826
 827         /**
 828          * Get a ParserOutput for the given ParserOptions and revision ID.
 829          * The parser cache will be used if possible.
 830          *
 831          * @since 1.19
 832          * @param $parserOptions ParserOptions to use for the parse operation
 833          * @param $oldid Revision ID to get the text from, passing null or 0 will
 834          *               get the current revision (default value)
 835          * @return ParserOutput or false if the revision was not found
 836          */
 837         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
 838                 wfProfileIn( __METHOD__ );
 839
 840                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 841                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 842                 if ( $parserOptions->getStubThreshold() ) {
 843                         wfIncrStats( 'pcache_miss_stub' );
 844                 }
 845
 846                 if ( $useParserCache ) {
 847                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 848                         if ( $parserOutput !== false ) {
 849                                 wfProfileOut( __METHOD__ );
 850                                 return $parserOutput;
 851                         }
 852                 }
 853
 854                 if ( $oldid === null || $oldid === 0 ) {
 855                         $oldid = $this->getLatest();
 856                 }
 857
 858                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
 859                 $pool->execute();
 860
 861                 wfProfileOut( __METHOD__ );
 862
 863                 return $pool->getParserOutput();
 864         }
 865
 866         /**
 867          * Do standard deferred updates after page view
 868          * @param $user User The relevant user
 869          */
 870         public function doViewUpdates( User $user ) {
 871                 global $wgDisableCounters;
 872                 if ( wfReadOnly() ) {
 873                         return;
 874                 }
 875
 876                 # Don't update page view counters on views from bot users (bug 14044)
 877                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
 878                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
 879                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
 880                 }
 881
 882                 # Update newtalk / watchlist notification status
 883                 $user->clearNotification( $this->mTitle );
 884         }
 885
 886         /**
 887          * Perform the actions of a page purging
 888          */
 889         public function doPurge() {
 890                 global $wgUseSquid;
 891
 892                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 893                         return false;
 894                 }
 895
 896                 // Invalidate the cache
 897                 $this->mTitle->invalidateCache();
 898                 $this->clear();
 899
 900                 if ( $wgUseSquid ) {
 901                         // Commit the transaction before the purge is sent
 902                         $dbw = wfGetDB( DB_MASTER );
 903                         $dbw->commit();
 904
 905                         // Send purge
 906                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 907                         $update->doUpdate();
 908                 }
 909
 910                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 911                         if ( $this->mTitle->exists() ) {
 912                                 $text = $this->getRawData();
 913                         } else {
 914                                 $text = false;
 915                         }
 916
 917                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 918                 }
 919                 return true;
 920         }
 921
 922         /**
 923          * Insert a new empty page record for this article.
 924          * This *must* be followed up by creating a revision
 925          * and running $this->updateRevisionOn( ... );
 926          * or else the record will be left in a funky state.
 927          * Best if all done inside a transaction.
 928          *
 929          * @param $dbw DatabaseBase
 930          * @return int The newly created page_id key, or false if the title already existed
 931          */
 932         public function insertOn( $dbw ) {
 933                 wfProfileIn( __METHOD__ );
 934
 935                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 936                 $dbw->insert( 'page', array(
 937                         'page_id'           => $page_id,
 938                         'page_namespace'    => $this->mTitle->getNamespace(),
 939                         'page_title'        => $this->mTitle->getDBkey(),
 940                         'page_counter'      => 0,
 941                         'page_restrictions' => '',
 942                         'page_is_redirect'  => 0, # Will set this shortly...
 943                         'page_is_new'       => 1,
 944                         'page_random'       => wfRandom(),
 945                         'page_touched'      => $dbw->timestamp(),
 946                         'page_latest'       => 0, # Fill this in shortly...
 947                         'page_len'          => 0, # Fill this in shortly...
 948                 ), __METHOD__, 'IGNORE' );
 949
 950                 $affected = $dbw->affectedRows();
 951
 952                 if ( $affected ) {
 953                         $newid = $dbw->insertId();
 954                         $this->mTitle->resetArticleID( $newid );
 955                 }
 956                 wfProfileOut( __METHOD__ );
 957
 958                 return $affected ? $newid : false;
 959         }
 960
 961         /**
 962          * Update the page record to point to a newly saved revision.
 963          *
 964          * @param $dbw DatabaseBase: object
 965          * @param $revision Revision: For ID number, and text used to set
 966          *                  length and redirect status fields
 967          * @param $lastRevision Integer: if given, will not overwrite the page field
 968          *                      when different from the currently set value.
 969          *                      Giving 0 indicates the new page flag should be set
 970          *                      on.
 971          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 972          *                           removing rows in redirect table.
 973          * @return bool true on success, false on failure
 974          * @private
 975          */
 976         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 977                 wfProfileIn( __METHOD__ );
 978
 979                 $text = $revision->getText();
 980                 $len = strlen( $text );
 981                 $rt = Title::newFromRedirectRecurse( $text );
 982
 983                 $conditions = array( 'page_id' => $this->getId() );
 984
 985                 if ( !is_null( $lastRevision ) ) {
 986                         # An extra check against threads stepping on each other
 987                         $conditions['page_latest'] = $lastRevision;
 988                 }
 989
 990                 $now = wfTimestampNow();
 991                 $dbw->update( 'page',
 992                         array( /* SET */
 993                                 'page_latest'      => $revision->getId(),
 994                                 'page_touched'     => $dbw->timestamp( $now ),
 995                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 996                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 997                                 'page_len'         => $len,
 998                         ),
 999                         $conditions,
1000                         __METHOD__ );
1001
1002                 $result = $dbw->affectedRows() != 0;
1003                 if ( $result ) {
1004                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1005                         $this->setLastEdit( $revision );
1006                         $this->setCachedLastEditTime( $now );
1007                         $this->mLatest = $revision->getId();
1008                         $this->mIsRedirect = (bool)$rt;
1009                         # Update the LinkCache.
1010                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1011                 }
1012
1013                 wfProfileOut( __METHOD__ );
1014                 return $result;
1015         }
1016
1017         /**
1018          * Add row to the redirect table if this is a redirect, remove otherwise.
1019          *
1020          * @param $dbw DatabaseBase
1021          * @param $redirectTitle Title object pointing to the redirect target,
1022          *                       or NULL if this is not a redirect
1023          * @param $lastRevIsRedirect If given, will optimize adding and
1024          *                           removing rows in redirect table.
1025          * @return bool true on success, false on failure
1026          * @private
1027          */
1028         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1029                 // Always update redirects (target link might have changed)
1030                 // Update/Insert if we don't know if the last revision was a redirect or not
1031                 // Delete if changing from redirect to non-redirect
1032                 $isRedirect = !is_null( $redirectTitle );
1033
1034                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1035                         return true;
1036                 }
1037
1038                 wfProfileIn( __METHOD__ );
1039                 if ( $isRedirect ) {
1040                         $this->insertRedirectEntry( $redirectTitle );
1041                 } else {
1042                         // This is not a redirect, remove row from redirect table
1043                         $where = array( 'rd_from' => $this->getId() );
1044                         $dbw->delete( 'redirect', $where, __METHOD__ );
1045                 }
1046
1047                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1048                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1049                 }
1050                 wfProfileOut( __METHOD__ );
1051
1052                 return ( $dbw->affectedRows() != 0 );
1053         }
1054
1055         /**
1056          * If the given revision is newer than the currently set page_latest,
1057          * update the page record. Otherwise, do nothing.
1058          *
1059          * @param $dbw Database object
1060          * @param $revision Revision object
1061          * @return mixed
1062          */
1063         public function updateIfNewerOn( $dbw, $revision ) {
1064                 wfProfileIn( __METHOD__ );
1065
1066                 $row = $dbw->selectRow(
1067                         array( 'revision', 'page' ),
1068                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1069                         array(
1070                                 'page_id' => $this->getId(),
1071                                 'page_latest=rev_id' ),
1072                         __METHOD__ );
1073
1074                 if ( $row ) {
1075                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1076                                 wfProfileOut( __METHOD__ );
1077                                 return false;
1078                         }
1079                         $prev = $row->rev_id;
1080                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1081                 } else {
1082                         # No or missing previous revision; mark the page as new
1083                         $prev = 0;
1084                         $lastRevIsRedirect = null;
1085                 }
1086
1087                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1088
1089                 wfProfileOut( __METHOD__ );
1090                 return $ret;
1091         }
1092
1093         /**
1094          * Get the text that needs to be saved in order to undo all revisions
1095          * between $undo and $undoafter. Revisions must belong to the same page,
1096          * must exist and must not be deleted
1097          * @param $undo Revision
1098          * @param $undoafter Revision Must be an earlier revision than $undo
1099          * @return mixed string on success, false on failure
1100          */
1101         public function getUndoText( Revision $undo, Revision $undoafter = null ) { #FIXME: move undo logic to ContentHandler
1102                 $cur_text = $this->getRawText();
1103                 if ( $cur_text === false ) {
1104                         return false; // no page
1105                 }
1106                 $undo_text = $undo->getText();
1107                 $undoafter_text = $undoafter->getText();
1108
1109                 if ( $cur_text == $undo_text ) {
1110                         # No use doing a merge if it's just a straight revert.
1111                         return $undoafter_text;
1112                 }
1113
1114                 $undone_text = '';
1115
1116                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
1117                         return false;
1118                 }
1119
1120                 return $undone_text;
1121         }
1122
1123         /**
1124          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1125          * @param $text String: new text of the section
1126          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1127          * @param $edittime String: revision timestamp or null to use the current revision
1128          * @return string Complete article text, or null if error
1129          */
1130         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) { #FIXME: move to Content object!
1131                 wfProfileIn( __METHOD__ );
1132
1133                 if ( strval( $section ) == '' ) {
1134                         // Whole-page edit; let the whole text through
1135                 } else {
1136                         // Bug 30711: always use current version when adding a new section
1137                         if ( is_null( $edittime ) || $section == 'new' ) {
1138                                 $oldtext = $this->getRawText();
1139                                 if ( $oldtext === false ) {
1140                                         wfDebug( __METHOD__ . ": no page text\n" );
1141                                         wfProfileOut( __METHOD__ );
1142                                         return null;
1143                                 }
1144                         } else {
1145                                 $dbw = wfGetDB( DB_MASTER );
1146                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1147
1148                                 if ( !$rev ) {
1149                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1150                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1151                                         wfProfileOut( __METHOD__ );
1152                                         return null;
1153                                 }
1154
1155                                 $oldtext = $rev->getText();
1156                         }
1157
1158                         if ( $section == 'new' ) {
1159                                 # Inserting a new section
1160                                 $subject = $sectionTitle ? wfMsgForContent( 'newsectionheaderdefaultlevel', $sectionTitle ) . "\n\n" : '';
1161                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
1162                                         $text = strlen( trim( $oldtext ) ) > 0
1163                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1164                                                 : "{$subject}{$text}";
1165                                 }
1166                         } else {
1167                                 # Replacing an existing section; roll out the big guns
1168                                 global $wgParser;
1169
1170                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1171                         }
1172                 }
1173
1174                 wfProfileOut( __METHOD__ );
1175                 return $text;
1176         }
1177
1178         /**
1179          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1180          * @param $flags Int
1181          * @return Int updated $flags
1182          */
1183         function checkFlags( $flags ) {
1184                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1185                         if ( $this->mTitle->getArticleID() ) {
1186                                 $flags |= EDIT_UPDATE;
1187                         } else {
1188                                 $flags |= EDIT_NEW;
1189                         }
1190                 }
1191
1192                 return $flags;
1193         }
1194
1195         /**
1196          * Change an existing article or create a new article. Updates RC and all necessary caches,
1197          * optionally via the deferred update array.
1198          *
1199          * @param $text String: new text
1200          * @param $summary String: edit summary
1201          * @param $flags Integer bitfield:
1202          *      EDIT_NEW
1203          *          Article is known or assumed to be non-existent, create a new one
1204          *      EDIT_UPDATE
1205          *          Article is known or assumed to be pre-existing, update it
1206          *      EDIT_MINOR
1207          *          Mark this edit minor, if the user is allowed to do so
1208          *      EDIT_SUPPRESS_RC
1209          *          Do not log the change in recentchanges
1210          *      EDIT_FORCE_BOT
1211          *          Mark the edit a "bot" edit regardless of user rights
1212          *      EDIT_DEFER_UPDATES
1213          *          Defer some of the updates until the end of index.php
1214          *      EDIT_AUTOSUMMARY
1215          *          Fill in blank summaries with generated text where possible
1216          *
1217          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1218          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1219          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1220          * edit-already-exists error will be returned. These two conditions are also possible with
1221          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1222          *
1223          * @param $baseRevId the revision ID this edit was based off, if any
1224          * @param $user User the user doing the edit
1225          *
1226          * @return Status object. Possible errors:
1227          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1228          *     edit-gone-missing:       In update mode, but the article didn't exist
1229          *     edit-conflict:           In update mode, the article changed unexpectedly
1230          *     edit-no-change:          Warning that the text was the same as before
1231          *     edit-already-exists:     In creation mode, but the article already exists
1232          *
1233          *  Extensions may define additional errors.
1234          *
1235          *  $return->value will contain an associative array with members as follows:
1236          *     new:                     Boolean indicating if the function attempted to create a new article
1237          *     revision:                The revision object for the inserted revision, or null
1238          *
1239          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1240          */
1241         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) { #FIXME: change $text to $content
1242                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1243
1244                 # Low-level sanity check
1245                 if ( $this->mTitle->getText() === '' ) {
1246                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1247                 }
1248
1249                 wfProfileIn( __METHOD__ );
1250
1251                 $user = is_null( $user ) ? $wgUser : $user;
1252                 $status = Status::newGood( array() );
1253
1254                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1255                 $this->loadPageData( 'fromdbmaster' );
1256
1257                 $flags = $this->checkFlags( $flags );
1258
1259                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1260                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1261                 {
1262                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1263
1264                         if ( $status->isOK() ) {
1265                                 $status->fatal( 'edit-hook-aborted' );
1266                         }
1267
1268                         wfProfileOut( __METHOD__ );
1269                         return $status;
1270                 }
1271
1272                 # Silently ignore EDIT_MINOR if not allowed
1273                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1274                 $bot = $flags & EDIT_FORCE_BOT;
1275
1276                 $oldtext = $this->getRawData(); // current revision
1277                 $oldsize = strlen( $oldtext );
1278                 $oldid = $this->getLatest();
1279                 $oldIsRedirect = $this->isRedirect();
1280                 $oldcountable = $this->isCountable();
1281
1282                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1283                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1284                         $summary = self::getAutosummary( $oldtext, $text, $flags ); #FIXME: auto-summary from ContentHandler
1285                 }
1286
1287                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1288                 $text = $editInfo->pst;
1289                 $newsize = strlen( $text );
1290
1291                 $dbw = wfGetDB( DB_MASTER );
1292                 $now = wfTimestampNow();
1293                 $this->mTimestamp = $now;
1294
1295                 if ( $flags & EDIT_UPDATE ) {
1296                         # Update article, but only if changed.
1297                         $status->value['new'] = false;
1298
1299                         if ( !$oldid ) {
1300                                 # Article gone missing
1301                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1302                                 $status->fatal( 'edit-gone-missing' );
1303
1304                                 wfProfileOut( __METHOD__ );
1305                                 return $status;
1306                         }
1307
1308                         # Make sure the revision is either completely inserted or not inserted at all
1309                         if ( !$wgDBtransactions ) {
1310                                 $userAbort = ignore_user_abort( true );
1311                         }
1312
1313                         $revision = new Revision( array(
1314                                 'page'       => $this->getId(),
1315                                 'comment'    => $summary,
1316                                 'minor_edit' => $isminor,
1317                                 'text'       => $text, #FIXME: set content instead, leave serialization to revision?!
1318                                 'parent_id'  => $oldid,
1319                                 'user'       => $user->getId(),
1320                                 'user_text'  => $user->getName(),
1321                                 'timestamp'  => $now
1322                         ) );
1323
1324                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1325
1326                         if ( $changed ) {
1327                                 $dbw->begin();
1328                                 $revisionId = $revision->insertOn( $dbw );
1329
1330                                 # Update page
1331                                 #
1332                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1333                                 # during the course of this function. This makes sure that EditPage can detect
1334                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1335                                 # before this function is called. A previous function used a separate query, this
1336                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1337                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1338
1339                                 if ( !$ok ) {
1340                                         /* Belated edit conflict! Run away!! */
1341                                         $status->fatal( 'edit-conflict' );
1342
1343                                         # Delete the invalid revision if the DB is not transactional
1344                                         if ( !$wgDBtransactions ) {
1345                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1346                                         }
1347
1348                                         $revisionId = 0;
1349                                         $dbw->rollback();
1350                                 } else {
1351                                         global $wgUseRCPatrol;
1352                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1353                                         # Update recentchanges
1354                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1355                                                 # Mark as patrolled if the user can do so
1356                                                 $patrolled = $wgUseRCPatrol && !count(
1357                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1358                                                 # Add RC row to the DB
1359                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1360                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1361                                                         $revisionId, $patrolled
1362                                                 );
1363
1364                                                 # Log auto-patrolled edits
1365                                                 if ( $patrolled ) {
1366                                                         PatrolLog::record( $rc, true );
1367                                                 }
1368                                         }
1369                                         $user->incEditCount();
1370                                         $dbw->commit();
1371                                 }
1372                         } else {
1373                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1374                                 // related variables correctly
1375                                 $revision->setId( $this->getLatest() );
1376                         }
1377
1378                         if ( !$wgDBtransactions ) {
1379                                 ignore_user_abort( $userAbort );
1380                         }
1381
1382                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1383                         if ( !$status->isOK() ) {
1384                                 wfProfileOut( __METHOD__ );
1385                                 return $status;
1386                         }
1387
1388                         # Update links tables, site stats, etc.
1389                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1390                                 'oldcountable' => $oldcountable ) );
1391
1392                         if ( !$changed ) {
1393                                 $status->warning( 'edit-no-change' );
1394                                 $revision = null;
1395                                 // Update page_touched, this is usually implicit in the page update
1396                                 // Other cache updates are done in onArticleEdit()
1397                                 $this->mTitle->invalidateCache();
1398                         }
1399                 } else {
1400                         # Create new article
1401                         $status->value['new'] = true;
1402
1403                         $dbw->begin();
1404
1405                         # Add the page record; stake our claim on this title!
1406                         # This will return false if the article already exists
1407                         $newid = $this->insertOn( $dbw );
1408
1409                         if ( $newid === false ) {
1410                                 $dbw->rollback();
1411                                 $status->fatal( 'edit-already-exists' );
1412
1413                                 wfProfileOut( __METHOD__ );
1414                                 return $status;
1415                         }
1416
1417                         # Save the revision text...
1418                         $revision = new Revision( array(
1419                                 'page'       => $newid,
1420                                 'comment'    => $summary,
1421                                 'minor_edit' => $isminor,
1422                                 'text'       => $text,
1423                                 'user'       => $user->getId(),
1424                                 'user_text'  => $user->getName(),
1425                                 'timestamp'  => $now
1426                         ) );
1427                         $revisionId = $revision->insertOn( $dbw );
1428
1429                         # Update the page record with revision data
1430                         $this->updateRevisionOn( $dbw, $revision, 0 );
1431
1432                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1433
1434                         # Update recentchanges
1435                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1436                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1437
1438                                 # Mark as patrolled if the user can do so
1439                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1440                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1441                                 # Add RC row to the DB
1442                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1443                                         '', strlen( $text ), $revisionId, $patrolled );
1444
1445                                 # Log auto-patrolled edits
1446                                 if ( $patrolled ) {
1447                                         PatrolLog::record( $rc, true );
1448                                 }
1449                         }
1450                         $user->incEditCount();
1451                         $dbw->commit();
1452
1453                         # Update links, etc.
1454                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1455
1456                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1457                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1458                 }
1459
1460                 # Do updates right now unless deferral was requested
1461                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1462                         DeferredUpdates::doUpdates();
1463                 }
1464
1465                 // Return the new revision (or null) to the caller
1466                 $status->value['revision'] = $revision;
1467
1468                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1469                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1470
1471                 # Promote user to any groups they meet the criteria for
1472                 $user->addAutopromoteOnceGroups( 'onEdit' );
1473
1474                 wfProfileOut( __METHOD__ );
1475                 return $status;
1476         }
1477
1478         /**
1479          * Get parser options suitable for rendering the primary article wikitext
1480          * @param User|string $user User object or 'canonical'
1481          * @return ParserOptions
1482          */
1483         public function makeParserOptions( $user ) {
1484                 global $wgContLang;
1485                 if ( $user instanceof User ) { // settings per user (even anons)
1486                         $options = ParserOptions::newFromUser( $user );
1487                 } else { // canonical settings
1488                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1489                 }
1490                 $options->enableLimitReport(); // show inclusion/loop reports
1491                 $options->setTidy( true ); // fix bad HTML
1492                 return $options;
1493         }
1494
1495         /**
1496          * Prepare text which is about to be saved.
1497          * Returns a stdclass with source, pst and output members
1498          */
1499         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1500                 global $wgParser, $wgContLang, $wgUser;
1501                 $user = is_null( $user ) ? $wgUser : $user;
1502                 // @TODO fixme: check $user->getId() here???
1503                 if ( $this->mPreparedEdit
1504                         && $this->mPreparedEdit->newText == $text
1505                         && $this->mPreparedEdit->revid == $revid
1506                 ) {
1507                         // Already prepared
1508                         return $this->mPreparedEdit;
1509                 }
1510
1511                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1512                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1513
1514                 $edit = (object)array();
1515                 $edit->revid = $revid;
1516                 $edit->newText = $text;
1517                 $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
1518                 $edit->popts = $this->makeParserOptions( 'canonical' );
1519                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1520                 $edit->oldText = $this->getRawText(); #FIXME: $oldcontent instead?!
1521
1522                 $this->mPreparedEdit = $edit;
1523
1524                 return $edit;
1525         }
1526
1527         /**
1528          * Do standard deferred updates after page edit.
1529          * Update links tables, site stats, search index and message cache.
1530          * Purges pages that include this page if the text was changed here.
1531          * Every 100th edit, prune the recent changes table.
1532          *
1533          * @private
1534          * @param $revision Revision object
1535          * @param $user User object that did the revision
1536          * @param $options Array of options, following indexes are used:
1537          * - changed: boolean, whether the revision changed the content (default true)
1538          * - created: boolean, whether the revision created the page (default false)
1539          * - oldcountable: boolean or null (default null):
1540          *   - boolean: whether the page was counted as an article before that
1541          *     revision, only used in changed is true and created is false
1542          *   - null: don't change the article count
1543          */
1544         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1545                 global $wgEnableParserCache;
1546
1547                 wfProfileIn( __METHOD__ );
1548
1549                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1550                 $text = $revision->getText();
1551
1552                 # Parse the text
1553                 # Be careful not to double-PST: $text is usually already PST-ed once
1554                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1555                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1556                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1557                 } else {
1558                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1559                         $editInfo = $this->mPreparedEdit;
1560                 }
1561
1562                 # Save it to the parser cache
1563                 if ( $wgEnableParserCache ) {
1564                         $parserCache = ParserCache::singleton();
1565                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1566                 }
1567
1568                 # Update the links tables
1569                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1570                 $u->doUpdate();
1571
1572                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1573
1574                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1575                         if ( 0 == mt_rand( 0, 99 ) ) {
1576                                 // Flush old entries from the `recentchanges` table; we do this on
1577                                 // random requests so as to avoid an increase in writes for no good reason
1578                                 global $wgRCMaxAge;
1579
1580                                 $dbw = wfGetDB( DB_MASTER );
1581                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1582                                 $dbw->delete(
1583                                         'recentchanges',
1584                                         array( "rc_timestamp < '$cutoff'" ),
1585                                         __METHOD__
1586                                 );
1587                         }
1588                 }
1589
1590                 if ( !$this->mTitle->exists() ) {
1591                         wfProfileOut( __METHOD__ );
1592                         return;
1593                 }
1594
1595                 $id = $this->getId();
1596                 $title = $this->mTitle->getPrefixedDBkey();
1597                 $shortTitle = $this->mTitle->getDBkey();
1598
1599                 if ( !$options['changed'] ) {
1600                         $good = 0;
1601                         $total = 0;
1602                 } elseif ( $options['created'] ) {
1603                         $good = (int)$this->isCountable( $editInfo );
1604                         $total = 1;
1605                 } elseif ( $options['oldcountable'] !== null ) {
1606                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1607                         $total = 0;
1608                 } else {
1609                         $good = 0;
1610                         $total = 0;
1611                 }
1612
1613                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1614                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
1615
1616                 # If this is another user's talk page, update newtalk.
1617                 # Don't do this if $options['changed'] = false (null-edits) nor if
1618                 # it's a minor edit and the user doesn't want notifications for those.
1619                 if ( $options['changed']
1620                         && $this->mTitle->getNamespace() == NS_USER_TALK
1621                         && $shortTitle != $user->getTitleKey()
1622                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1623                 ) {
1624                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1625                                 $other = User::newFromName( $shortTitle, false );
1626                                 if ( !$other ) {
1627                                         wfDebug( __METHOD__ . ": invalid username\n" );
1628                                 } elseif ( User::isIP( $shortTitle ) ) {
1629                                         // An anonymous user
1630                                         $other->setNewtalk( true );
1631                                 } elseif ( $other->isLoggedIn() ) {
1632                                         $other->setNewtalk( true );
1633                                 } else {
1634                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1635                                 }
1636                         }
1637                 }
1638
1639                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1640                         MessageCache::singleton()->replace( $shortTitle, $text );
1641                 }
1642
1643                 if( $options['created'] ) {
1644                         self::onArticleCreate( $this->mTitle );
1645                 } else {
1646                         self::onArticleEdit( $this->mTitle );
1647                 }
1648
1649                 wfProfileOut( __METHOD__ );
1650         }
1651
1652         /**
1653          * Edit an article without doing all that other stuff
1654          * The article must already exist; link tables etc
1655          * are not updated, caches are not flushed.
1656          *
1657          * @param $text String: text submitted
1658          * @param $user User The relevant user
1659          * @param $comment String: comment submitted
1660          * @param $minor Boolean: whereas it's a minor modification
1661          */
1662         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1663                 wfProfileIn( __METHOD__ );
1664
1665                 $dbw = wfGetDB( DB_MASTER );
1666                 $revision = new Revision( array(
1667                         'page'       => $this->getId(),
1668                         'text'       => $text,
1669                         'comment'    => $comment,
1670                         'minor_edit' => $minor ? 1 : 0,
1671                 ) );
1672                 $revision->insertOn( $dbw );
1673                 $this->updateRevisionOn( $dbw, $revision );
1674
1675                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1676
1677                 wfProfileOut( __METHOD__ );
1678         }
1679
1680         /**
1681          * Update the article's restriction field, and leave a log entry.
1682          * This works for protection both existing and non-existing pages.
1683          *
1684          * @param $limit Array: set of restriction keys
1685          * @param $reason String
1686          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1687          * @param $expiry Array: per restriction type expiration
1688          * @param $user User The user updating the restrictions
1689          * @return bool true on success
1690          */
1691         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1692                 global $wgContLang;
1693
1694                 if ( wfReadOnly() ) {
1695                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1696                 }
1697
1698                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1699
1700                 $id = $this->mTitle->getArticleID();
1701
1702                 if ( !$cascade ) {
1703                         $cascade = false;
1704                 }
1705
1706                 // Take this opportunity to purge out expired restrictions
1707                 Title::purgeExpiredRestrictions();
1708
1709                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1710                 # we expect a single selection, but the schema allows otherwise.
1711                 $isProtected = false;
1712                 $protect = false;
1713                 $changed = false;
1714
1715                 $dbw = wfGetDB( DB_MASTER );
1716
1717                 foreach ( $restrictionTypes as $action ) {
1718                         if ( !isset( $expiry[$action] ) ) {
1719                                 $expiry[$action] = $dbw->getInfinity();
1720                         }
1721                         if ( !isset( $limit[$action] ) ) {
1722                                 $limit[$action] = '';
1723                         } elseif ( $limit[$action] != '' ) {
1724                                 $protect = true;
1725                         }
1726
1727                         # Get current restrictions on $action
1728                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1729                         if ( $current != '' ) {
1730                                 $isProtected = true;
1731                         }
1732
1733                         if ( $limit[$action] != $current ) {
1734                                 $changed = true;
1735                         } elseif ( $limit[$action] != '' ) {
1736                                 # Only check expiry change if the action is actually being
1737                                 # protected, since expiry does nothing on an not-protected
1738                                 # action.
1739                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1740                                         $changed = true;
1741                                 }
1742                         }
1743                 }
1744
1745                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1746                         $changed = true;
1747                 }
1748
1749                 # If nothing's changed, do nothing
1750                 if ( !$changed ) {
1751                         return Status::newGood();
1752                 }
1753
1754                 if ( !$protect ) { # No protection at all means unprotection
1755                         $revCommentMsg = 'unprotectedarticle';
1756                         $logAction = 'unprotect';
1757                 } elseif ( $isProtected ) {
1758                         $revCommentMsg = 'modifiedarticleprotection';
1759                         $logAction = 'modify';
1760                 } else {
1761                         $revCommentMsg = 'protectedarticle';
1762                         $logAction = 'protect';
1763                 }
1764
1765                 $encodedExpiry = array();
1766                 $protectDescription = '';
1767                 foreach ( $limit as $action => $restrictions ) {
1768                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1769                         if ( $restrictions != '' ) {
1770                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1771                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1772                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
1773                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1774                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1775                                                 $wgContLang->time( $expiry[$action], false, false ) );
1776                                 } else {
1777                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
1778                                 }
1779
1780                                 $protectDescription .= ') ';
1781                         }
1782                 }
1783                 $protectDescription = trim( $protectDescription );
1784
1785                 if ( $id ) { # Protection of existing page
1786                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1787                                 return Status::newGood();
1788                         }
1789
1790                         # Only restrictions with the 'protect' right can cascade...
1791                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1792                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1793
1794                         # The schema allows multiple restrictions
1795                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1796                                 $cascade = false;
1797                         }
1798
1799                         # Update restrictions table
1800                         foreach ( $limit as $action => $restrictions ) {
1801                                 if ( $restrictions != '' ) {
1802                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1803                                                 array( 'pr_page' => $id,
1804                                                         'pr_type' => $action,
1805                                                         'pr_level' => $restrictions,
1806                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1807                                                         'pr_expiry' => $encodedExpiry[$action]
1808                                                 ),
1809                                                 __METHOD__
1810                                         );
1811                                 } else {
1812                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1813                                                 'pr_type' => $action ), __METHOD__ );
1814                                 }
1815                         }
1816
1817                         # Prepare a null revision to be added to the history
1818                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
1819                         if ( $reason ) {
1820                                 $editComment .= ": $reason";
1821                         }
1822                         if ( $protectDescription ) {
1823                                 $editComment .= " ($protectDescription)";
1824                         }
1825                         if ( $cascade ) {
1826                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1827                         }
1828
1829                         # Insert a null revision
1830                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1831                         $nullRevId = $nullRevision->insertOn( $dbw );
1832
1833                         $latest = $this->getLatest();
1834                         # Update page record
1835                         $dbw->update( 'page',
1836                                 array( /* SET */
1837                                         'page_touched' => $dbw->timestamp(),
1838                                         'page_restrictions' => '',
1839                                         'page_latest' => $nullRevId
1840                                 ), array( /* WHERE */
1841                                         'page_id' => $id
1842                                 ), __METHOD__
1843                         );
1844
1845                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1846                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1847                 } else { # Protection of non-existing page (also known as "title protection")
1848                         # Cascade protection is meaningless in this case
1849                         $cascade = false;
1850
1851                         if ( $limit['create'] != '' ) {
1852                                 $dbw->replace( 'protected_titles',
1853                                         array( array( 'pt_namespace', 'pt_title' ) ),
1854                                         array(
1855                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1856                                                 'pt_title' => $this->mTitle->getDBkey(),
1857                                                 'pt_create_perm' => $limit['create'],
1858                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
1859                                                 'pt_expiry' => $encodedExpiry['create'],
1860                                                 'pt_user' => $user->getId(),
1861                                                 'pt_reason' => $reason,
1862                                         ), __METHOD__
1863                                 );
1864                         } else {
1865                                 $dbw->delete( 'protected_titles',
1866                                         array(
1867                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1868                                                 'pt_title' => $this->mTitle->getDBkey()
1869                                         ), __METHOD__
1870                                 );
1871                         }
1872                 }
1873
1874                 $this->mTitle->flushRestrictions();
1875
1876                 if ( $logAction == 'unprotect' ) {
1877                         $logParams = array();
1878                 } else {
1879                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
1880                 }
1881
1882                 # Update the protection log
1883                 $log = new LogPage( 'protect' );
1884                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
1885
1886                 return Status::newGood();
1887         }
1888
1889         /**
1890          * Take an array of page restrictions and flatten it to a string
1891          * suitable for insertion into the page_restrictions field.
1892          * @param $limit Array
1893          * @return String
1894          */
1895         protected static function flattenRestrictions( $limit ) {
1896                 if ( !is_array( $limit ) ) {
1897                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1898                 }
1899
1900                 $bits = array();
1901                 ksort( $limit );
1902
1903                 foreach ( $limit as $action => $restrictions ) {
1904                         if ( $restrictions != '' ) {
1905                                 $bits[] = "$action=$restrictions";
1906                         }
1907                 }
1908
1909                 return implode( ':', $bits );
1910         }
1911
1912         /**
1913          * Back-end article deletion
1914          * Deletes the article with database consistency, writes logs, purges caches
1915          *
1916          * @param $reason string delete reason for deletion log
1917          * @param $suppress bitfield
1918          *      Revision::DELETED_TEXT
1919          *      Revision::DELETED_COMMENT
1920          *      Revision::DELETED_USER
1921          *      Revision::DELETED_RESTRICTED
1922          * @param $id int article ID
1923          * @param $commit boolean defaults to true, triggers transaction end
1924          * @param &$errors Array of errors to append to
1925          * @param $user User The relevant user
1926          * @return boolean true if successful
1927          */
1928         public function doDeleteArticle(
1929                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1930         ) {
1931                 global $wgUser;
1932                 $user = is_null( $user ) ? $wgUser : $user;
1933
1934                 wfDebug( __METHOD__ . "\n" );
1935
1936                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1937                         return false;
1938                 }
1939                 $dbw = wfGetDB( DB_MASTER );
1940                 $t = $this->mTitle->getDBkey();
1941                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1942
1943                 if ( $t === '' || $id == 0 ) {
1944                         return false;
1945                 }
1946
1947                 // Bitfields to further suppress the content
1948                 if ( $suppress ) {
1949                         $bitfield = 0;
1950                         // This should be 15...
1951                         $bitfield |= Revision::DELETED_TEXT;
1952                         $bitfield |= Revision::DELETED_COMMENT;
1953                         $bitfield |= Revision::DELETED_USER;
1954                         $bitfield |= Revision::DELETED_RESTRICTED;
1955                 } else {
1956                         $bitfield = 'rev_deleted';
1957                 }
1958
1959                 $dbw->begin();
1960                 // For now, shunt the revision data into the archive table.
1961                 // Text is *not* removed from the text table; bulk storage
1962                 // is left intact to avoid breaking block-compression or
1963                 // immutable storage schemes.
1964                 //
1965                 // For backwards compatibility, note that some older archive
1966                 // table entries will have ar_text and ar_flags fields still.
1967                 //
1968                 // In the future, we may keep revisions and mark them with
1969                 // the rev_deleted field, which is reserved for this purpose.
1970                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1971                         array(
1972                                 'ar_namespace'  => 'page_namespace',
1973                                 'ar_title'      => 'page_title',
1974                                 'ar_comment'    => 'rev_comment',
1975                                 'ar_user'       => 'rev_user',
1976                                 'ar_user_text'  => 'rev_user_text',
1977                                 'ar_timestamp'  => 'rev_timestamp',
1978                                 'ar_minor_edit' => 'rev_minor_edit',
1979                                 'ar_rev_id'     => 'rev_id',
1980                                 'ar_parent_id'  => 'rev_parent_id',
1981                                 'ar_text_id'    => 'rev_text_id',
1982                                 'ar_text'       => '\'\'', // Be explicit to appease
1983                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1984                                 'ar_len'        => 'rev_len',
1985                                 'ar_page_id'    => 'page_id',
1986                                 'ar_deleted'    => $bitfield,
1987                                 'ar_sha1'       => 'rev_content_model',
1988                                 'ar_content_format'       => 'rev_content_format',
1989                                 'ar_content_format'       => 'rev_sha1'
1990                         ), array(
1991                                 'page_id' => $id,
1992                                 'page_id = rev_page'
1993                         ), __METHOD__
1994                 );
1995
1996                 # Now that it's safely backed up, delete it
1997                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1998                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1999
2000                 if ( !$ok ) {
2001                         $dbw->rollback();
2002                         return false;
2003                 }
2004
2005                 $this->doDeleteUpdates( $id );
2006
2007                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2008                 $logtype = $suppress ? 'suppress' : 'delete';
2009
2010                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2011                 $logEntry->setPerformer( $user );
2012                 $logEntry->setTarget( $this->mTitle );
2013                 $logEntry->setComment( $reason );
2014                 $logid = $logEntry->insert();
2015                 $logEntry->publish( $logid );
2016
2017                 if ( $commit ) {
2018                         $dbw->commit();
2019                 }
2020
2021                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2022                 return true;
2023         }
2024
2025         /**
2026          * Do some database updates after deletion
2027          *
2028          * @param $id Int: page_id value of the page being deleted
2029          */
2030         public function doDeleteUpdates( $id ) {
2031                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2032
2033                 $dbw = wfGetDB( DB_MASTER );
2034
2035                 # Delete restrictions for it
2036                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2037
2038                 # Fix category table counts
2039                 $cats = array();
2040                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2041
2042                 foreach ( $res as $row ) {
2043                         $cats [] = $row->cl_to;
2044                 }
2045
2046                 $this->updateCategoryCounts( array(), $cats );
2047
2048                 # If using cascading deletes, we can skip some explicit deletes
2049                 if ( !$dbw->cascadingDeletes() ) {
2050                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2051
2052                         # Delete outgoing links
2053                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
2054                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
2055                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
2056                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
2057                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
2058                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
2059                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
2060                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
2061                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
2062                 }
2063
2064                 # If using cleanup triggers, we can skip some manual deletes
2065                 if ( !$dbw->cleanupTriggers() ) {
2066                         # Clean up recentchanges entries...
2067                         $dbw->delete( 'recentchanges',
2068                                 array( 'rc_type != ' . RC_LOG,
2069                                         'rc_namespace' => $this->mTitle->getNamespace(),
2070                                         'rc_title' => $this->mTitle->getDBkey() ),
2071                                 __METHOD__ );
2072                         $dbw->delete( 'recentchanges',
2073                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2074                                 __METHOD__ );
2075                 }
2076
2077                 # Clear caches
2078                 self::onArticleDelete( $this->mTitle );
2079
2080                 # Clear the cached article id so the interface doesn't act like we exist
2081                 $this->mTitle->resetArticleID( 0 );
2082         }
2083
2084         /**
2085          * Roll back the most recent consecutive set of edits to a page
2086          * from the same user; fails if there are no eligible edits to
2087          * roll back to, e.g. user is the sole contributor. This function
2088          * performs permissions checks on $user, then calls commitRollback()
2089          * to do the dirty work
2090          *
2091          * @todo: seperate the business/permission stuff out from backend code
2092          *
2093          * @param $fromP String: Name of the user whose edits to rollback.
2094          * @param $summary String: Custom summary. Set to default summary if empty.
2095          * @param $token String: Rollback token.
2096          * @param $bot Boolean: If true, mark all reverted edits as bot.
2097          *
2098          * @param $resultDetails Array: contains result-specific array of additional values
2099          *    'alreadyrolled' : 'current' (rev)
2100          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2101          *
2102          * @param $user User The user performing the rollback
2103          * @return array of errors, each error formatted as
2104          *   array(messagekey, param1, param2, ...).
2105          * On success, the array is empty.  This array can also be passed to
2106          * OutputPage::showPermissionsErrorPage().
2107          */
2108         public function doRollback(
2109                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2110         ) {
2111                 $resultDetails = null;
2112
2113                 # Check permissions
2114                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2115                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2116                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2117
2118                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2119                         $errors[] = array( 'sessionfailure' );
2120                 }
2121
2122                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2123                         $errors[] = array( 'actionthrottledtext' );
2124                 }
2125
2126                 # If there were errors, bail out now
2127                 if ( !empty( $errors ) ) {
2128                         return $errors;
2129                 }
2130
2131                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2132         }
2133
2134         /**
2135          * Backend implementation of doRollback(), please refer there for parameter
2136          * and return value documentation
2137          *
2138          * NOTE: This function does NOT check ANY permissions, it just commits the
2139          * rollback to the DB. Therefore, you should only call this function direct-
2140          * ly if you want to use custom permissions checks. If you don't, use
2141          * doRollback() instead.
2142          * @param $fromP String: Name of the user whose edits to rollback.
2143          * @param $summary String: Custom summary. Set to default summary if empty.
2144          * @param $bot Boolean: If true, mark all reverted edits as bot.
2145          *
2146          * @param $resultDetails Array: contains result-specific array of additional values
2147          * @param $guser User The user performing the rollback
2148          */
2149         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2150                 global $wgUseRCPatrol, $wgContLang;
2151
2152                 $dbw = wfGetDB( DB_MASTER );
2153
2154                 if ( wfReadOnly() ) {
2155                         return array( array( 'readonlytext' ) );
2156                 }
2157
2158                 # Get the last editor
2159                 $current = Revision::newFromTitle( $this->mTitle );
2160                 if ( is_null( $current ) ) {
2161                         # Something wrong... no page?
2162                         return array( array( 'notanarticle' ) );
2163                 }
2164
2165                 $from = str_replace( '_', ' ', $fromP );
2166                 # User name given should match up with the top revision.
2167                 # If the user was deleted then $from should be empty.
2168                 if ( $from != $current->getUserText() ) {
2169                         $resultDetails = array( 'current' => $current );
2170                         return array( array( 'alreadyrolled',
2171                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2172                                 htmlspecialchars( $fromP ),
2173                                 htmlspecialchars( $current->getUserText() )
2174                         ) );
2175                 }
2176
2177                 # Get the last edit not by this guy...
2178                 # Note: these may not be public values
2179                 $user = intval( $current->getRawUser() );
2180                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2181                 $s = $dbw->selectRow( 'revision',
2182                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2183                         array( 'rev_page' => $current->getPage(),
2184                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2185                         ), __METHOD__,
2186                         array( 'USE INDEX' => 'page_timestamp',
2187                                 'ORDER BY' => 'rev_timestamp DESC' )
2188                         );
2189                 if ( $s === false ) {
2190                         # No one else ever edited this page
2191                         return array( array( 'cantrollback' ) );
2192                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2193                         # Only admins can see this text
2194                         return array( array( 'notvisiblerev' ) );
2195                 }
2196
2197                 $set = array();
2198                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2199                         # Mark all reverted edits as bot
2200                         $set['rc_bot'] = 1;
2201                 }
2202
2203                 if ( $wgUseRCPatrol ) {
2204                         # Mark all reverted edits as patrolled
2205                         $set['rc_patrolled'] = 1;
2206                 }
2207
2208                 if ( count( $set ) ) {
2209                         $dbw->update( 'recentchanges', $set,
2210                                 array( /* WHERE */
2211                                         'rc_cur_id' => $current->getPage(),
2212                                         'rc_user_text' => $current->getUserText(),
2213                                         "rc_timestamp > '{$s->rev_timestamp}'",
2214                                 ), __METHOD__
2215                         );
2216                 }
2217
2218                 # Generate the edit summary if necessary
2219                 $target = Revision::newFromId( $s->rev_id );
2220                 if ( empty( $summary ) ) {
2221                         if ( $from == '' ) { // no public user name
2222                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2223                         } else {
2224                                 $summary = wfMsgForContent( 'revertpage' );
2225                         }
2226                 }
2227
2228                 # Allow the custom summary to use the same args as the default message
2229                 $args = array(
2230                         $target->getUserText(), $from, $s->rev_id,
2231                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2232                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2233                 );
2234                 $summary = wfMsgReplaceArgs( $summary, $args );
2235
2236                 # Save
2237                 $flags = EDIT_UPDATE;
2238
2239                 if ( $guser->isAllowed( 'minoredit' ) ) {
2240                         $flags |= EDIT_MINOR;
2241                 }
2242
2243                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2244                         $flags |= EDIT_FORCE_BOT;
2245                 }
2246
2247                 # Actually store the edit
2248                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId(), $guser );
2249                 if ( !empty( $status->value['revision'] ) ) {
2250                         $revId = $status->value['revision']->getId();
2251                 } else {
2252                         $revId = false;
2253                 }
2254
2255                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2256
2257                 $resultDetails = array(
2258                         'summary' => $summary,
2259                         'current' => $current,
2260                         'target'  => $target,
2261                         'newid'   => $revId
2262                 );
2263
2264                 return array();
2265         }
2266
2267         /**
2268          * The onArticle*() functions are supposed to be a kind of hooks
2269          * which should be called whenever any of the specified actions
2270          * are done.
2271          *
2272          * This is a good place to put code to clear caches, for instance.
2273          *
2274          * This is called on page move and undelete, as well as edit
2275          *
2276          * @param $title Title object
2277          */
2278         public static function onArticleCreate( $title ) {
2279                 # Update existence markers on article/talk tabs...
2280                 if ( $title->isTalkPage() ) {
2281                         $other = $title->getSubjectPage();
2282                 } else {
2283                         $other = $title->getTalkPage();
2284                 }
2285
2286                 $other->invalidateCache();
2287                 $other->purgeSquid();
2288
2289                 $title->touchLinks();
2290                 $title->purgeSquid();
2291                 $title->deleteTitleProtection();
2292         }
2293
2294         /**
2295          * Clears caches when article is deleted
2296          *
2297          * @param $title Title
2298          */
2299         public static function onArticleDelete( $title ) {
2300                 # Update existence markers on article/talk tabs...
2301                 if ( $title->isTalkPage() ) {
2302                         $other = $title->getSubjectPage();
2303                 } else {
2304                         $other = $title->getTalkPage();
2305                 }
2306
2307                 $other->invalidateCache();
2308                 $other->purgeSquid();
2309
2310                 $title->touchLinks();
2311                 $title->purgeSquid();
2312
2313                 # File cache
2314                 HTMLFileCache::clearFileCache( $title );
2315
2316                 # Messages
2317                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2318                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2319                 }
2320
2321                 # Images
2322                 if ( $title->getNamespace() == NS_FILE ) {
2323                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2324                         $update->doUpdate();
2325                 }
2326
2327                 # User talk pages
2328                 if ( $title->getNamespace() == NS_USER_TALK ) {
2329                         $user = User::newFromName( $title->getText(), false );
2330                         if ( $user ) {
2331                                 $user->setNewtalk( false );
2332                         }
2333                 }
2334
2335                 # Image redirects
2336                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2337         }
2338
2339         /**
2340          * Purge caches on page update etc
2341          *
2342          * @param $title Title object
2343          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2344          */
2345         public static function onArticleEdit( $title ) {
2346                 // Invalidate caches of articles which include this page
2347                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2348
2349
2350                 // Invalidate the caches of all pages which redirect here
2351                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2352
2353                 # Purge squid for this page only
2354                 $title->purgeSquid();
2355
2356                 # Clear file cache for this page only
2357                 HTMLFileCache::clearFileCache( $title );
2358         }
2359
2360         /**#@-*/
2361
2362         /**
2363          * Returns a list of hidden categories this page is a member of.
2364          * Uses the page_props and categorylinks tables.
2365          *
2366          * @return Array of Title objects
2367          */
2368         public function getHiddenCategories() {
2369                 $result = array();
2370                 $id = $this->mTitle->getArticleID();
2371
2372                 if ( $id == 0 ) {
2373                         return array();
2374                 }
2375
2376                 $dbr = wfGetDB( DB_SLAVE );
2377                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2378                         array( 'cl_to' ),
2379                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2380                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2381                         __METHOD__ );
2382
2383                 if ( $res !== false ) {
2384                         foreach ( $res as $row ) {
2385                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2386                         }
2387                 }
2388
2389                 return $result;
2390         }
2391
2392         /**
2393         * Return an applicable autosummary if one exists for the given edit.
2394         * @param $oldtext String: the previous text of the page.
2395         * @param $newtext String: The submitted text of the page.
2396         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2397         * @return string An appropriate autosummary, or an empty string.
2398         */
2399         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2400                 global $wgContLang;
2401
2402                 # Decide what kind of autosummary is needed.
2403
2404                 # Redirect autosummaries
2405                 $ot = Title::newFromRedirect( $oldtext );
2406                 $rt = Title::newFromRedirect( $newtext );
2407
2408                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2409                         $truncatedtext = $wgContLang->truncate(
2410                                 str_replace( "\n", ' ', $newtext ),
2411                                 max( 0, 250
2412                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2413                                         - strlen( $rt->getFullText() )
2414                                 ) );
2415                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2416                 }
2417
2418                 # New page autosummaries
2419                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2420                         # If they're making a new article, give its text, truncated, in the summary.
2421
2422                         $truncatedtext = $wgContLang->truncate(
2423                                 str_replace( "\n", ' ', $newtext ),
2424                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2425
2426                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2427                 }
2428
2429                 # Blanking autosummaries
2430                 if ( $oldtext != '' && $newtext == '' ) {
2431                         return wfMsgForContent( 'autosumm-blank' );
2432                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2433                         # Removing more than 90% of the article
2434
2435                         $truncatedtext = $wgContLang->truncate(
2436                                 $newtext,
2437                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2438
2439                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2440                 }
2441
2442                 # If we reach this point, there's no applicable autosummary for our case, so our
2443                 # autosummary is empty.
2444                 return '';
2445         }
2446
2447         /**
2448          * Auto-generates a deletion reason
2449          *
2450          * @param &$hasHistory Boolean: whether the page has a history
2451          * @return mixed String containing deletion reason or empty string, or boolean false
2452          *    if no revision occurred
2453          */
2454         public function getAutoDeleteReason( &$hasHistory ) {
2455                 global $wgContLang;
2456
2457                 $dbw = wfGetDB( DB_MASTER );
2458                 // Get the last revision
2459                 $rev = Revision::newFromTitle( $this->getTitle() );
2460
2461                 if ( is_null( $rev ) ) {
2462                         return false;
2463                 }
2464
2465                 // Get the article's contents
2466                 $contents = $rev->getText();
2467                 $blank = false;
2468
2469                 // If the page is blank, use the text from the previous revision,
2470                 // which can only be blank if there's a move/import/protect dummy revision involved
2471                 if ( $contents == '' ) {
2472                         $prev = $rev->getPrevious();
2473
2474                         if ( $prev )    {
2475                                 $contents = $prev->getText();
2476                                 $blank = true;
2477                         }
2478                 }
2479
2480                 // Find out if there was only one contributor
2481                 // Only scan the last 20 revisions
2482                 $res = $dbw->select( 'revision', 'rev_user_text',
2483                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2484                         __METHOD__,
2485                         array( 'LIMIT' => 20 )
2486                 );
2487
2488                 if ( $res === false ) {
2489                         // This page has no revisions, which is very weird
2490                         return false;
2491                 }
2492
2493                 $hasHistory = ( $res->numRows() > 1 );
2494                 $row = $dbw->fetchObject( $res );
2495
2496                 if ( $row ) { // $row is false if the only contributor is hidden
2497                         $onlyAuthor = $row->rev_user_text;
2498                         // Try to find a second contributor
2499                         foreach ( $res as $row ) {
2500                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2501                                         $onlyAuthor = false;
2502                                         break;
2503                                 }
2504                         }
2505                 } else {
2506                         $onlyAuthor = false;
2507                 }
2508
2509                 // Generate the summary with a '$1' placeholder
2510                 if ( $blank ) {
2511                         // The current revision is blank and the one before is also
2512                         // blank. It's just not our lucky day
2513                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2514                 } else {
2515                         if ( $onlyAuthor ) {
2516                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2517                         } else {
2518                                 $reason = wfMsgForContent( 'excontent', '$1' );
2519                         }
2520                 }
2521
2522                 if ( $reason == '-' ) {
2523                         // Allow these UI messages to be blanked out cleanly
2524                         return '';
2525                 }
2526
2527                 // Replace newlines with spaces to prevent uglyness
2528                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2529                 // Calculate the maximum amount of chars to get
2530                 // Max content length = max comment length - length of the comment (excl. $1)
2531                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2532                 $contents = $wgContLang->truncate( $contents, $maxLength );
2533                 // Remove possible unfinished links
2534                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2535                 // Now replace the '$1' placeholder
2536                 $reason = str_replace( '$1', $contents, $reason );
2537
2538                 return $reason;
2539         }
2540
2541         /**
2542          * Update all the appropriate counts in the category table, given that
2543          * we've added the categories $added and deleted the categories $deleted.
2544          *
2545          * @param $added array   The names of categories that were added
2546          * @param $deleted array The names of categories that were deleted
2547          */
2548         public function updateCategoryCounts( $added, $deleted ) {
2549                 $ns = $this->mTitle->getNamespace();
2550                 $dbw = wfGetDB( DB_MASTER );
2551
2552                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2553                 # exist, we might legitimately not create it, but it's simpler to just
2554                 # create it and then give it a negative value, since the value is bogus
2555                 # anyway.
2556                 #
2557                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2558                 $insertCats = array_merge( $added, $deleted );
2559                 if ( !$insertCats ) {
2560                         # Okay, nothing to do
2561                         return;
2562                 }
2563
2564                 $insertRows = array();
2565
2566                 foreach ( $insertCats as $cat ) {
2567                         $insertRows[] = array(
2568                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2569                                 'cat_title' => $cat
2570                         );
2571                 }
2572                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2573
2574                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2575                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2576
2577                 if ( $ns == NS_CATEGORY ) {
2578                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2579                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2580                 } elseif ( $ns == NS_FILE ) {
2581                         $addFields[]    = 'cat_files = cat_files + 1';
2582                         $removeFields[] = 'cat_files = cat_files - 1';
2583                 }
2584
2585                 if ( $added ) {
2586                         $dbw->update(
2587                                 'category',
2588                                 $addFields,
2589                                 array( 'cat_title' => $added ),
2590                                 __METHOD__
2591                         );
2592                 }
2593
2594                 if ( $deleted ) {
2595                         $dbw->update(
2596                                 'category',
2597                                 $removeFields,
2598                                 array( 'cat_title' => $deleted ),
2599                                 __METHOD__
2600                         );
2601                 }
2602         }
2603
2604         /**
2605          * Updates cascading protections
2606          *
2607          * @param $parserOutput ParserOutput object for the current version
2608          */
2609         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2610                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2611                         return;
2612                 }
2613
2614                 // templatelinks table may have become out of sync,
2615                 // especially if using variable-based transclusions.
2616                 // For paranoia, check if things have changed and if
2617                 // so apply updates to the database. This will ensure
2618                 // that cascaded protections apply as soon as the changes
2619                 // are visible.
2620
2621                 # Get templates from templatelinks
2622                 $id = $this->mTitle->getArticleID();
2623
2624                 $tlTemplates = array();
2625
2626                 $dbr = wfGetDB( DB_SLAVE );
2627                 $res = $dbr->select( array( 'templatelinks' ),
2628                         array( 'tl_namespace', 'tl_title' ),
2629                         array( 'tl_from' => $id ),
2630                         __METHOD__
2631                 );
2632
2633                 foreach ( $res as $row ) {
2634                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2635                 }
2636
2637                 # Get templates from parser output.
2638                 $poTemplates = array();
2639                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2640                         foreach ( $templates as $dbk => $id ) {
2641                                 $poTemplates["$ns:$dbk"] = true;
2642                         }
2643                 }
2644
2645                 # Get the diff
2646                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2647
2648                 if ( count( $templates_diff ) > 0 ) {
2649                         # Whee, link updates time.
2650                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2651                         $u->doUpdate();
2652                 }
2653         }
2654
2655         /**
2656          * Return a list of templates used by this article.
2657          * Uses the templatelinks table
2658          *
2659          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2660          * @return Array of Title objects
2661          */
2662         public function getUsedTemplates() {
2663                 return $this->mTitle->getTemplateLinksFrom();
2664         }
2665
2666         /**
2667          * Perform article updates on a special page creation.
2668          *
2669          * @param $rev Revision object
2670          *
2671          * @todo This is a shitty interface function. Kill it and replace the
2672          * other shitty functions like doEditUpdates and such so it's not needed
2673          * anymore.
2674          * @deprecated since 1.18, use doEditUpdates()
2675          */
2676         public function createUpdates( $rev ) {
2677                 wfDeprecated( __METHOD__, '1.18' );
2678                 global $wgUser;
2679                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2680         }
2681
2682         /**
2683          * This function is called right before saving the wikitext,
2684          * so we can do things like signatures and links-in-context.
2685          *
2686          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2687          * @param $text String article contents
2688          * @param $user User object: user doing the edit
2689          * @param $popts ParserOptions object: parser options, default options for
2690          *               the user loaded if null given
2691          * @return string article contents with altered wikitext markup (signatures
2692          *      converted, {{subst:}}, templates, etc.)
2693          */
2694         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2695                 global $wgParser, $wgUser;
2696
2697                 wfDeprecated( __METHOD__, '1.19' );
2698
2699                 $user = is_null( $user ) ? $wgUser : $user;
2700
2701                 if ( $popts === null ) {
2702                         $popts = ParserOptions::newFromUser( $user );
2703                 }
2704
2705                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2706         }
2707
2708         /**
2709          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2710          *
2711          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2712          * @return bool
2713          */
2714         public function isBigDeletion() {
2715                 wfDeprecated( __METHOD__, '1.19' );
2716                 return $this->mTitle->isBigDeletion();
2717         }
2718
2719         /**
2720          * Get the  approximate revision count of this page.
2721          *
2722          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2723          * @return int
2724          */
2725         public function estimateRevisionCount() {
2726                 wfDeprecated( __METHOD__, '1.19' );
2727                 return $this->mTitle->estimateRevisionCount();
2728         }
2729
2730         /**
2731          * Update the article's restriction field, and leave a log entry.
2732          *
2733          * @deprecated since 1.19
2734          * @param $limit Array: set of restriction keys
2735          * @param $reason String
2736          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2737          * @param $expiry Array: per restriction type expiration
2738          * @param $user User The user updating the restrictions
2739          * @return bool true on success
2740          */
2741         public function updateRestrictions(
2742                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2743         ) {
2744                 global $wgUser;
2745
2746                 $user = is_null( $user ) ? $wgUser : $user;
2747
2748                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2749         }
2750
2751         /**
2752          * @deprecated since 1.18
2753          */
2754         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2755                 wfDeprecated( __METHOD__, '1.18' );
2756                 global $wgUser;
2757                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2758         }
2759
2760         /**
2761          * @deprecated since 1.18
2762          */
2763         public function viewUpdates() {
2764                 wfDeprecated( __METHOD__, '1.18' );
2765                 global $wgUser;
2766                 return $this->doViewUpdates( $wgUser );
2767         }
2768
2769         /**
2770          * @deprecated since 1.18
2771          */
2772         public function useParserCache( $oldid ) {
2773                 wfDeprecated( __METHOD__, '1.18' );
2774                 global $wgUser;
2775                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2776         }
2777 }
2778
2779 class PoolWorkArticleView extends PoolCounterWork {
2780
2781         /**
2782          * @var Page
2783          */
2784         private $page;
2785
2786         /**
2787          * @var string
2788          */
2789         private $cacheKey;
2790
2791         /**
2792          * @var integer
2793          */
2794         private $revid;
2795
2796         /**
2797          * @var ParserOptions
2798          */
2799         private $parserOptions;
2800
2801         /**
2802          * @var string|null
2803          */
2804         private $text;
2805
2806         /**
2807          * @var ParserOutput|false
2808          */
2809         private $parserOutput = false;
2810
2811         /**
2812          * @var bool
2813          */
2814         private $isDirty = false;
2815
2816         /**
2817          * @var Status|false
2818          */
2819         private $error = false;
2820
2821         /**
2822          * Constructor
2823          *
2824          * @param $page Page
2825          * @param $revid Integer: ID of the revision being parsed
2826          * @param $useParserCache Boolean: whether to use the parser cache
2827          * @param $parserOptions parserOptions to use for the parse operation
2828          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
2829          */
2830         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
2831         if ( is_string($content) ) { #BC: old style call
2832             $content = ContentHandler::makeContent( $content, $page->getTitle(), null, $this->revid ); #FIXME: format? from revision?
2833         }
2834
2835                 $this->page = $page;
2836                 $this->revid = $revid;
2837                 $this->cacheable = $useParserCache;
2838                 $this->parserOptions = $parserOptions;
2839                 $this->content = $content;
2840                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
2841                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
2842         }
2843
2844         /**
2845          * Get the ParserOutput from this object, or false in case of failure
2846          *
2847          * @return ParserOutput
2848          */
2849         public function getParserOutput() {
2850                 return $this->parserOutput;
2851         }
2852
2853         /**
2854          * Get whether the ParserOutput is a dirty one (i.e. expired)
2855          *
2856          * @return bool
2857          */
2858         public function getIsDirty() {
2859                 return $this->isDirty;
2860         }
2861
2862         /**
2863          * Get a Status object in case of error or false otherwise
2864          *
2865          * @return Status|false
2866          */
2867         public function getError() {
2868                 return $this->error;
2869         }
2870
2871         /**
2872          * @return bool
2873          */
2874         function doWork() {
2875                 global $wgParser, $wgUseFileCache;
2876
2877                 $isCurrent = $this->revid === $this->page->getLatest();
2878
2879                 if ( $this->content !== null ) {
2880                         $content = $this->content;
2881                 } elseif ( $isCurrent ) {
2882             $content = $this->page->getContent( Revision::RAW ); #XXX: why use RAW audience here, and PUBLIC (default) below?
2883                 } else {
2884                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
2885                         if ( $rev === null ) {
2886                                 return false;
2887                         }
2888             $content = $rev->getContent(); #XXX: why use PUBLIC audience here (default), and RAW above?
2889                 }
2890
2891                 $time = - wfTime();
2892                 $this->parserOutput = $content->getParserOutput( $this->parserOptions );
2893                 $time += wfTime();
2894
2895                 # Timing hack
2896                 if ( $time > 3 ) {
2897                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
2898                                 $this->page->getTitle()->getPrefixedDBkey() ) );
2899                 }
2900
2901                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
2902                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
2903                 }
2904
2905                 // Make sure file cache is not used on uncacheable content.
2906                 // Output that has magic words in it can still use the parser cache
2907                 // (if enabled), though it will generally expire sooner.
2908                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
2909                         $wgUseFileCache = false;
2910                 }
2911
2912                 if ( $isCurrent ) {
2913                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
2914                 }
2915
2916                 return true;
2917         }
2918
2919         /**
2920          * @return bool
2921          */
2922         function getCachedWork() {
2923                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
2924
2925                 if ( $this->parserOutput === false ) {
2926                         wfDebug( __METHOD__ . ": parser cache miss\n" );
2927                         return false;
2928                 } else {
2929                         wfDebug( __METHOD__ . ": parser cache hit\n" );
2930                         return true;
2931                 }
2932         }
2933
2934         /**
2935          * @return bool
2936          */
2937         function fallback() {
2938                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
2939
2940                 if ( $this->parserOutput === false ) {
2941                         wfDebugLog( 'dirty', "dirty missing\n" );
2942                         wfDebug( __METHOD__ . ": no dirty cache\n" );
2943                         return false;
2944                 } else {
2945                         wfDebug( __METHOD__ . ": sending dirty output\n" );
2946                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
2947                         $this->isDirty = true;
2948                         return true;
2949                 }
2950         }
2951
2952         /**
2953          * @param $status Status
2954          */
2955         function error( $status ) {
2956                 $this->error = $status;
2957                 return false;
2958         }
2959 }