includes/WikiPage.php

   1 <?php
   2 /**
   3  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
   4  */
   5 abstract class Page {}
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * Some fields are public only for backwards-compatibility. Use accessors.
  11  * In the past, this class was part of Article.php and everything was public.
  12  *
  13  * @internal documentation reviewed 15 Mar 2010
  14  */
  15 class WikiPage extends Page {
  16         // doDeleteArticleReal() return values. Values less than zero indicate fatal errors,
  17         // values greater than zero indicate that there were problems not resulting in page
  18         // not being deleted
  19
  20         /**
  21          * Delete operation aborted by hook
  22          */
  23         const DELETE_HOOK_ABORTED = -1;
  24
  25         /**
  26          * Deletion successful
  27          */
  28         const DELETE_SUCCESS = 0;
  29
  30         /**
  31          * Page not found
  32          */
  33         const DELETE_NO_PAGE = 1;
  34
  35         /**
  36          * No revisions found to delete
  37          */
  38         const DELETE_NO_REVISIONS = 2;
  39
  40         /**
  41          * @var Title
  42          */
  43         public $mTitle = null;
  44
  45         /**@{{
  46          * @protected
  47          */
  48         public $mDataLoaded = false;         // !< Boolean
  49         public $mIsRedirect = false;         // !< Boolean
  50         public $mLatest = false;             // !< Integer (false means "not loaded")
  51         public $mPreparedEdit = false;       // !< Array
  52         /**@}}*/
  53
  54         /**
  55          * @var Title
  56          */
  57         protected $mRedirectTarget = null;
  58
  59         /**
  60          * @var Revision
  61          */
  62         protected $mLastRevision = null;
  63
  64         /**
  65          * @var string; timestamp of the current revision or empty string if not loaded
  66          */
  67         protected $mTimestamp = '';
  68
  69         /**
  70          * @var string
  71          */
  72         protected $mTouched = '19700101000000';
  73
  74         /**
  75          * @var int|null
  76          */
  77         protected $mCounter = null;
  78
  79         /**
  80          * Constructor and clear the article
  81          * @param $title Title Reference to a Title object.
  82          */
  83         public function __construct( Title $title ) {
  84                 $this->mTitle = $title;
  85         }
  86
  87         /**
  88          * Create a WikiPage object of the appropriate class for the given title.
  89          *
  90          * @param $title Title
  91          * @return WikiPage object of the appropriate type
  92          */
  93         public static function factory( Title $title ) {
  94                 $ns = $title->getNamespace();
  95
  96                 if ( $ns == NS_MEDIA ) {
  97                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  98                 } elseif ( $ns < 0 ) {
  99                         throw new MWException( "Invalid or virtual namespace $ns given." );
 100                 }
 101
 102                 switch ( $ns ) {
 103                         case NS_FILE:
 104                                 $page = new WikiFilePage( $title );
 105                                 break;
 106                         case NS_CATEGORY:
 107                                 $page = new WikiCategoryPage( $title );
 108                                 break;
 109                         default:
 110                                 $page = new WikiPage( $title );
 111                 }
 112
 113                 return $page;
 114         }
 115
 116         /**
 117          * Constructor from a page id
 118          *
 119          * @param $id Int article ID to load
 120          *
 121          * @return WikiPage|null
 122          */
 123         public static function newFromID( $id ) {
 124                 $t = Title::newFromID( $id );
 125                 if ( $t ) {
 126                         return self::factory( $t );
 127                 }
 128                 return null;
 129         }
 130
 131         /**
 132          * Returns overrides for action handlers.
 133          * Classes listed here will be used instead of the default one when
 134          * (and only when) $wgActions[$action] === true. This allows subclasses
 135          * to override the default behavior.
 136          *
 137          * @todo: move this UI stuff somewhere else
 138          *
 139          * @return Array
 140          */
 141         public function getActionOverrides() {
 142                 return array();
 143         }
 144
 145         /**
 146          * Get the title object of the article
 147          * @return Title object of this page
 148          */
 149         public function getTitle() {
 150                 return $this->mTitle;
 151         }
 152
 153         /**
 154          * Clear the object
 155          */
 156         public function clear() {
 157                 $this->mDataLoaded = false;
 158
 159                 $this->mCounter = null;
 160                 $this->mRedirectTarget = null; # Title object if set
 161                 $this->mLastRevision = null; # Latest revision
 162                 $this->mTouched = '19700101000000';
 163                 $this->mTimestamp = '';
 164                 $this->mIsRedirect = false;
 165                 $this->mLatest = false;
 166                 $this->mPreparedEdit = false;
 167         }
 168
 169         /**
 170          * Return the list of revision fields that should be selected to create
 171          * a new page.
 172          *
 173          * @return array
 174          */
 175         public static function selectFields() {
 176                 return array(
 177                         'page_id',
 178                         'page_namespace',
 179                         'page_title',
 180                         'page_restrictions',
 181                         'page_counter',
 182                         'page_is_redirect',
 183                         'page_is_new',
 184                         'page_random',
 185                         'page_touched',
 186                         'page_latest',
 187                         'page_len',
 188             'page_content_model',
 189                 );
 190         }
 191
 192         /**
 193          * Fetch a page record with the given conditions
 194          * @param $dbr DatabaseBase object
 195          * @param $conditions Array
 196          * @return mixed Database result resource, or false on failure
 197          */
 198         protected function pageData( $dbr, $conditions ) {
 199                 $fields = self::selectFields();
 200
 201                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 202
 203                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 204
 205                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 206
 207                 return $row;
 208         }
 209
 210         /**
 211          * Fetch a page record matching the Title object's namespace and title
 212          * using a sanitized title string
 213          *
 214          * @param $dbr DatabaseBase object
 215          * @param $title Title object
 216          * @return mixed Database result resource, or false on failure
 217          */
 218         public function pageDataFromTitle( $dbr, $title ) {
 219                 return $this->pageData( $dbr, array(
 220                         'page_namespace' => $title->getNamespace(),
 221                         'page_title'     => $title->getDBkey() ) );
 222         }
 223
 224         /**
 225          * Fetch a page record matching the requested ID
 226          *
 227          * @param $dbr DatabaseBase
 228          * @param $id Integer
 229          * @return mixed Database result resource, or false on failure
 230          */
 231         public function pageDataFromId( $dbr, $id ) {
 232                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 233         }
 234
 235         /**
 236          * Set the general counter, title etc data loaded from
 237          * some source.
 238          *
 239          * @param $data Object|String One of the following:
 240          *              A DB query result object or...
 241          *              "fromdb" to get from a slave DB or...
 242          *              "fromdbmaster" to get from the master DB
 243          * @return void
 244          */
 245         public function loadPageData( $data = 'fromdb' ) {
 246                 if ( $data === 'fromdbmaster' ) {
 247                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 248                 } elseif ( $data === 'fromdb' ) { // slave
 249                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 250                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 251                         # Note that DB also stores the master position in the session and checks it.
 252                         $touched = $this->getCachedLastEditTime();
 253                         if ( $touched ) { // key set
 254                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 255                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 256                                 }
 257                         }
 258                 }
 259
 260                 $lc = LinkCache::singleton();
 261
 262                 if ( $data ) {
 263                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 264
 265                         $this->mTitle->loadFromRow( $data );
 266
 267                         # Old-fashioned restrictions
 268                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 269
 270                         $this->mCounter     = intval( $data->page_counter );
 271                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 272                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 273                         $this->mLatest      = intval( $data->page_latest );
 274                 } else {
 275                         $lc->addBadLinkObj( $this->mTitle );
 276
 277                         $this->mTitle->loadFromRow( false );
 278                 }
 279
 280                 $this->mDataLoaded = true;
 281         }
 282
 283         /**
 284          * @return int Page ID
 285          */
 286         public function getId() {
 287                 return $this->mTitle->getArticleID();
 288         }
 289
 290         /**
 291          * @return bool Whether or not the page exists in the database
 292          */
 293         public function exists() {
 294                 return $this->mTitle->exists();
 295         }
 296
 297         /**
 298          * Check if this page is something we're going to be showing
 299          * some sort of sensible content for. If we return false, page
 300          * views (plain action=view) will return an HTTP 404 response,
 301          * so spiders and robots can know they're following a bad link.
 302          *
 303          * @return bool
 304          */
 305         public function hasViewableContent() {
 306                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 307         }
 308
 309         /**
 310          * @return int The view count for the page
 311          */
 312         public function getCount() {
 313                 if ( !$this->mDataLoaded ) {
 314                         $this->loadPageData();
 315                 }
 316
 317                 return $this->mCounter;
 318         }
 319
 320         /**
 321          * Tests if the article text represents a redirect
 322          *
 323          * @param $text mixed string containing article contents, or boolean
 324          * @return bool
 325          */
 326         public function isRedirect( $text = false ) {
 327         if ( $text === false ) $content = $this->getContent();
 328         else $content = ContentHandler::makeContent( $text, $this->mTitle ); # TODO: allow model and format to be provided; or better, expect a Content object
 329
 330
 331         if ( empty( $content ) ) return false;
 332         else return $content->isRedirect();
 333         }
 334
 335     /**
 336      * Returns the page's content model name. Will use the revisions actual content model if the page exists,
 337      * and the page's default if the page doesn't exist yet.
 338      *
 339      * @return int
 340      */
 341     public function getContentModelName() {
 342         if ( $this->exists() ) {
 343             # look at the revision's actual content model
 344             $content = $this->getContent();
 345             return $content->getModelName();
 346         } else {
 347             # use the default model for this page
 348             return $this->mTitle->getContentModelName();
 349         }
 350     }
 351
 352         /**
 353          * Loads page_touched and returns a value indicating if it should be used
 354          * @return boolean true if not a redirect
 355          */
 356         public function checkTouched() {
 357                 if ( !$this->mDataLoaded ) {
 358                         $this->loadPageData();
 359                 }
 360                 return !$this->mIsRedirect;
 361         }
 362
 363         /**
 364          * Get the page_touched field
 365          * @return string containing GMT timestamp
 366          */
 367         public function getTouched() {
 368                 if ( !$this->mDataLoaded ) {
 369                         $this->loadPageData();
 370                 }
 371                 return $this->mTouched;
 372         }
 373
 374         /**
 375          * Get the page_latest field
 376          * @return integer rev_id of current revision
 377          */
 378         public function getLatest() {
 379                 if ( !$this->mDataLoaded ) {
 380                         $this->loadPageData();
 381                 }
 382                 return (int)$this->mLatest;
 383         }
 384
 385         /**
 386          * Loads everything except the text
 387          * This isn't necessary for all uses, so it's only done if needed.
 388          */
 389         protected function loadLastEdit() {
 390                 if ( $this->mLastRevision !== null ) {
 391                         return; // already loaded
 392                 }
 393
 394                 $latest = $this->getLatest();
 395                 if ( !$latest ) {
 396                         return; // page doesn't exist or is missing page_latest info
 397                 }
 398
 399                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 400                 if ( $revision ) { // sanity
 401                         $this->setLastEdit( $revision );
 402                 }
 403         }
 404
 405         /**
 406          * Set the latest revision
 407          */
 408         protected function setLastEdit( Revision $revision ) {
 409                 $this->mLastRevision = $revision;
 410                 $this->mTimestamp = $revision->getTimestamp();
 411         }
 412
 413         /**
 414          * Get the latest revision
 415          * @return Revision|null
 416          */
 417         public function getRevision() {
 418                 $this->loadLastEdit();
 419                 if ( $this->mLastRevision ) {
 420                         return $this->mLastRevision;
 421                 }
 422                 return null;
 423         }
 424
 425     /**
 426      * Get the content of the current revision. No side-effects...
 427      *
 428      * @param $audience Integer: one of:
 429      *      Revision::FOR_PUBLIC       to be displayed to all users
 430      *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 431      *      Revision::RAW              get the text regardless of permissions
 432      * @return Content|null The content of the current revision
 433      */
 434     public function getContent( $audience = Revision::FOR_PUBLIC ) {
 435         $this->loadLastEdit();
 436         if ( $this->mLastRevision ) {
 437             return $this->mLastRevision->getContent( $audience );
 438         }
 439         return false;
 440     }
 441
 442         /**
 443          * Get the text of the current revision. No side-effects...
 444          *
 445          * @param $audience Integer: one of:
 446          *      Revision::FOR_PUBLIC       to be displayed to all users
 447          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 448          *      Revision::RAW              get the text regardless of permissions
 449          * @return String|false The text of the current revision
 450      * @deprecated as of 1.20, getContent() should be used instead.
 451          */
 452         public function getText( $audience = Revision::FOR_PUBLIC ) { #FIXME: deprecated, replace usage!
 453         wfDeprecated( __METHOD__, '1.20' );
 454                 $this->loadLastEdit();
 455                 if ( $this->mLastRevision ) {
 456                         return $this->mLastRevision->getText( $audience );
 457                 }
 458                 return false;
 459         }
 460
 461         /**
 462          * Get the text of the current revision. No side-effects...
 463          *
 464          * @return String|bool The text of the current revision. False on failure
 465          */
 466         public function getRawText() { #FIXME: deprecated, replace usage!
 467                 return $this->getText( Revision::RAW );
 468         }
 469
 470     /**
 471      * Get the content of the current revision. No side-effects...
 472      *
 473      * @return Contet|false The text of the current revision
 474      */
 475     protected function getNativeData() { #FIXME: examine all uses carefully! caller must be aware of content model!
 476         $content = $this->getContent( Revision::RAW );
 477         if ( !$content ) return null;
 478
 479         return $content->getNativeData();
 480     }
 481
 482         /**
 483          * @return string MW timestamp of last article revision
 484          */
 485         public function getTimestamp() {
 486                 // Check if the field has been filled by WikiPage::setTimestamp()
 487                 if ( !$this->mTimestamp ) {
 488                         $this->loadLastEdit();
 489                 }
 490
 491                 return wfTimestamp( TS_MW, $this->mTimestamp );
 492         }
 493
 494         /**
 495          * Set the page timestamp (use only to avoid DB queries)
 496          * @param $ts string MW timestamp of last article revision
 497          * @return void
 498          */
 499         public function setTimestamp( $ts ) {
 500                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 501         }
 502
 503         /**
 504          * @param $audience Integer: one of:
 505          *      Revision::FOR_PUBLIC       to be displayed to all users
 506          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 507          *      Revision::RAW              get the text regardless of permissions
 508          * @return int user ID for the user that made the last article revision
 509          */
 510         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 511                 $this->loadLastEdit();
 512                 if ( $this->mLastRevision ) {
 513                         return $this->mLastRevision->getUser( $audience );
 514                 } else {
 515                         return -1;
 516                 }
 517         }
 518
 519         /**
 520          * @param $audience Integer: one of:
 521          *      Revision::FOR_PUBLIC       to be displayed to all users
 522          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 523          *      Revision::RAW              get the text regardless of permissions
 524          * @return string username of the user that made the last article revision
 525          */
 526         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 527                 $this->loadLastEdit();
 528                 if ( $this->mLastRevision ) {
 529                         return $this->mLastRevision->getUserText( $audience );
 530                 } else {
 531                         return '';
 532                 }
 533         }
 534
 535         /**
 536          * @param $audience Integer: one of:
 537          *      Revision::FOR_PUBLIC       to be displayed to all users
 538          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 539          *      Revision::RAW              get the text regardless of permissions
 540          * @return string Comment stored for the last article revision
 541          */
 542         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 543                 $this->loadLastEdit();
 544                 if ( $this->mLastRevision ) {
 545                         return $this->mLastRevision->getComment( $audience );
 546                 } else {
 547                         return '';
 548                 }
 549         }
 550
 551         /**
 552          * Returns true if last revision was marked as "minor edit"
 553          *
 554          * @return boolean Minor edit indicator for the last article revision.
 555          */
 556         public function getMinorEdit() {
 557                 $this->loadLastEdit();
 558                 if ( $this->mLastRevision ) {
 559                         return $this->mLastRevision->isMinor();
 560                 } else {
 561                         return false;
 562                 }
 563         }
 564
 565         /**
 566          * Get the cached timestamp for the last time the page changed.
 567          * This is only used to help handle slave lag by comparing to page_touched.
 568          * @return string MW timestamp
 569          */
 570         protected function getCachedLastEditTime() {
 571                 global $wgMemc;
 572                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 573                 return $wgMemc->get( $key );
 574         }
 575
 576         /**
 577          * Set the cached timestamp for the last time the page changed.
 578          * This is only used to help handle slave lag by comparing to page_touched.
 579          * @param $timestamp string
 580          * @return void
 581          */
 582         public function setCachedLastEditTime( $timestamp ) {
 583                 global $wgMemc;
 584                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 585                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 586         }
 587
 588         /**
 589          * Determine whether a page would be suitable for being counted as an
 590          * article in the site_stats table based on the title & its content
 591          *
 592          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 593          *        if false, the current database state will be used
 594          * @return Boolean
 595          */
 596         public function isCountable( $editInfo = false ) {
 597                 global $wgArticleCountMethod;
 598
 599                 if ( !$this->mTitle->isContentPage() ) {
 600                         return false;
 601                 }
 602
 603         if ( $editInfo ) {
 604             $content = ContentHandler::makeContent( $editInfo->pst, $this->mTitle );
 605             # TODO: take model and format from edit info!
 606         } else {
 607             $content = $this->getContent();
 608         }
 609
 610                 if ( !$content || $content->isRedirect( ) ) {
 611                         return false;
 612                 }
 613
 614         $hasLinks = null;
 615
 616         if ( $wgArticleCountMethod === 'link' ) {
 617             # nasty special case to avoid re-parsing to detect links
 618
 619             if ( $editInfo ) {
 620                 // ParserOutput::getLinks() is a 2D array of page links, so
 621                 // to be really correct we would need to recurse in the array
 622                 // but the main array should only have items in it if there are
 623                 // links.
 624                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 625             } else {
 626                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 627                     array( 'pl_from' => $this->getId() ), __METHOD__ );
 628             }
 629         }
 630
 631                 return $content->isCountable( $hasLinks );
 632         }
 633
 634         /**
 635          * If this page is a redirect, get its target
 636          *
 637          * The target will be fetched from the redirect table if possible.
 638          * If this page doesn't have an entry there, call insertRedirect()
 639          * @return Title|mixed object, or null if this page is not a redirect
 640          */
 641         public function getRedirectTarget() {
 642                 if ( !$this->mTitle->isRedirect() ) {
 643                         return null;
 644                 }
 645
 646                 if ( $this->mRedirectTarget !== null ) {
 647                         return $this->mRedirectTarget;
 648                 }
 649
 650                 # Query the redirect table
 651                 $dbr = wfGetDB( DB_SLAVE );
 652                 $row = $dbr->selectRow( 'redirect',
 653                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 654                         array( 'rd_from' => $this->getId() ),
 655                         __METHOD__
 656                 );
 657
 658                 // rd_fragment and rd_interwiki were added later, populate them if empty
 659                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 660                         return $this->mRedirectTarget = Title::makeTitle(
 661                                 $row->rd_namespace, $row->rd_title,
 662                                 $row->rd_fragment, $row->rd_interwiki );
 663                 }
 664
 665                 # This page doesn't have an entry in the redirect table
 666                 return $this->mRedirectTarget = $this->insertRedirect();
 667         }
 668
 669         /**
 670          * Insert an entry for this page into the redirect table.
 671          *
 672          * Don't call this function directly unless you know what you're doing.
 673          * @return Title object or null if not a redirect
 674          */
 675         public function insertRedirect() {
 676                 // recurse through to only get the final target
 677         $content = $this->getContent();
 678                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 679                 if ( !$retval ) {
 680                         return null;
 681                 }
 682                 $this->insertRedirectEntry( $retval );
 683                 return $retval;
 684         }
 685
 686         /**
 687          * Insert or update the redirect table entry for this page to indicate
 688          * it redirects to $rt .
 689          * @param $rt Title redirect target
 690          */
 691         public function insertRedirectEntry( $rt ) {
 692                 $dbw = wfGetDB( DB_MASTER );
 693                 $dbw->replace( 'redirect', array( 'rd_from' ),
 694                         array(
 695                                 'rd_from'      => $this->getId(),
 696                                 'rd_namespace' => $rt->getNamespace(),
 697                                 'rd_title'     => $rt->getDBkey(),
 698                                 'rd_fragment'  => $rt->getFragment(),
 699                                 'rd_interwiki' => $rt->getInterwiki(),
 700                         ),
 701                         __METHOD__
 702                 );
 703         }
 704
 705         /**
 706          * Get the Title object or URL this page redirects to
 707          *
 708          * @return mixed false, Title of in-wiki target, or string with URL
 709          */
 710         public function followRedirect() {
 711                 return $this->getRedirectURL( $this->getRedirectTarget() );
 712         }
 713
 714         /**
 715          * Get the Title object or URL to use for a redirect. We use Title
 716          * objects for same-wiki, non-special redirects and URLs for everything
 717          * else.
 718          * @param $rt Title Redirect target
 719          * @return mixed false, Title object of local target, or string with URL
 720          */
 721         public function getRedirectURL( $rt ) {
 722                 if ( !$rt ) {
 723                         return false;
 724                 }
 725
 726                 if ( $rt->isExternal() ) {
 727                         if ( $rt->isLocal() ) {
 728                                 // Offsite wikis need an HTTP redirect.
 729                                 //
 730                                 // This can be hard to reverse and may produce loops,
 731                                 // so they may be disabled in the site configuration.
 732                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 733                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 734                         } else {
 735                                 // External pages pages without "local" bit set are not valid
 736                                 // redirect targets
 737                                 return false;
 738                         }
 739                 }
 740
 741                 if ( $rt->isSpecialPage() ) {
 742                         // Gotta handle redirects to special pages differently:
 743                         // Fill the HTTP response "Location" header and ignore
 744                         // the rest of the page we're on.
 745                         //
 746                         // Some pages are not valid targets
 747                         if ( $rt->isValidRedirectTarget() ) {
 748                                 return $rt->getFullURL();
 749                         } else {
 750                                 return false;
 751                         }
 752                 }
 753
 754                 return $rt;
 755         }
 756
 757         /**
 758          * Get a list of users who have edited this article, not including the user who made
 759          * the most recent revision, which you can get from $article->getUser() if you want it
 760          * @return UserArrayFromResult
 761          */
 762         public function getContributors() {
 763                 # @todo FIXME: This is expensive; cache this info somewhere.
 764
 765                 $dbr = wfGetDB( DB_SLAVE );
 766
 767                 if ( $dbr->implicitGroupby() ) {
 768                         $realNameField = 'user_real_name';
 769                 } else {
 770                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 771                 }
 772
 773                 $tables = array( 'revision', 'user' );
 774
 775                 $fields = array(
 776                         'rev_user as user_id',
 777                         'rev_user_text AS user_name',
 778                         $realNameField,
 779                         'MAX(rev_timestamp) AS timestamp',
 780                 );
 781
 782                 $conds = array( 'rev_page' => $this->getId() );
 783
 784                 // The user who made the top revision gets credited as "this page was last edited by
 785                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 786                 $user = $this->getUser();
 787                 if ( $user ) {
 788                         $conds[] = "rev_user != $user";
 789                 } else {
 790                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 791                 }
 792
 793                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 794
 795                 $jconds = array(
 796                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 797                 );
 798
 799                 $options = array(
 800                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 801                         'ORDER BY' => 'timestamp DESC',
 802                 );
 803
 804                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 805                 return new UserArrayFromResult( $res );
 806         }
 807
 808         /**
 809          * Get the last N authors
 810          * @param $num Integer: number of revisions to get
 811          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 812          * @return array Array of authors, duplicates not removed
 813          */
 814         public function getLastNAuthors( $num, $revLatest = 0 ) {
 815                 wfProfileIn( __METHOD__ );
 816                 // First try the slave
 817                 // If that doesn't have the latest revision, try the master
 818                 $continue = 2;
 819                 $db = wfGetDB( DB_SLAVE );
 820
 821                 do {
 822                         $res = $db->select( array( 'page', 'revision' ),
 823                                 array( 'rev_id', 'rev_user_text' ),
 824                                 array(
 825                                         'page_namespace' => $this->mTitle->getNamespace(),
 826                                         'page_title' => $this->mTitle->getDBkey(),
 827                                         'rev_page = page_id'
 828                                 ), __METHOD__,
 829                                 array(
 830                                         'ORDER BY' => 'rev_timestamp DESC',
 831                                         'LIMIT' => $num
 832                                 )
 833                         );
 834
 835                         if ( !$res ) {
 836                                 wfProfileOut( __METHOD__ );
 837                                 return array();
 838                         }
 839
 840                         $row = $db->fetchObject( $res );
 841
 842                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 843                                 $db = wfGetDB( DB_MASTER );
 844                                 $continue--;
 845                         } else {
 846                                 $continue = 0;
 847                         }
 848                 } while ( $continue );
 849
 850                 $authors = array( $row->rev_user_text );
 851
 852                 foreach ( $res as $row ) {
 853                         $authors[] = $row->rev_user_text;
 854                 }
 855
 856                 wfProfileOut( __METHOD__ );
 857                 return $authors;
 858         }
 859
 860         /**
 861          * Should the parser cache be used?
 862          *
 863          * @param $parserOptions ParserOptions to check
 864          * @param $oldid int
 865          * @return boolean
 866          */
 867         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 868                 global $wgEnableParserCache;
 869
 870                 return $wgEnableParserCache
 871                         && $parserOptions->getStubThreshold() == 0
 872                         && $this->mTitle->exists()
 873                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 874                         && $this->mTitle->isWikitextPage(); #FIXME: ask ContentHandler if cachable!
 875         }
 876
 877         /**
 878          * Get a ParserOutput for the given ParserOptions and revision ID.
 879          * The parser cache will be used if possible.
 880          *
 881          * @since 1.19
 882          * @param $parserOptions ParserOptions to use for the parse operation
 883          * @param $oldid Revision ID to get the text from, passing null or 0 will
 884          *               get the current revision (default value)
 885          * @return ParserOutput or false if the revision was not found
 886          */
 887         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
 888                 wfProfileIn( __METHOD__ );
 889
 890                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 891                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 892                 if ( $parserOptions->getStubThreshold() ) {
 893                         wfIncrStats( 'pcache_miss_stub' );
 894                 }
 895
 896                 if ( $useParserCache ) {
 897                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 898                         if ( $parserOutput !== false ) {
 899                                 wfProfileOut( __METHOD__ );
 900                                 return $parserOutput;
 901                         }
 902                 }
 903
 904                 if ( $oldid === null || $oldid === 0 ) {
 905                         $oldid = $this->getLatest();
 906                 }
 907
 908                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
 909                 $pool->execute();
 910
 911                 wfProfileOut( __METHOD__ );
 912
 913                 return $pool->getParserOutput();
 914         }
 915
 916         /**
 917          * Do standard deferred updates after page view
 918          * @param $user User The relevant user
 919          */
 920         public function doViewUpdates( User $user ) {
 921                 global $wgDisableCounters;
 922                 if ( wfReadOnly() ) {
 923                         return;
 924                 }
 925
 926                 # Don't update page view counters on views from bot users (bug 14044)
 927                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
 928                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
 929                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
 930                 }
 931
 932                 # Update newtalk / watchlist notification status
 933                 $user->clearNotification( $this->mTitle );
 934         }
 935
 936         /**
 937          * Perform the actions of a page purging
 938          * @return bool
 939          */
 940         public function doPurge() {
 941                 global $wgUseSquid;
 942
 943                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 944                         return false;
 945                 }
 946
 947                 // Invalidate the cache
 948                 $this->mTitle->invalidateCache();
 949                 $this->clear();
 950
 951                 if ( $wgUseSquid ) {
 952                         // Commit the transaction before the purge is sent
 953                         $dbw = wfGetDB( DB_MASTER );
 954                         $dbw->commit( __METHOD__ );
 955
 956                         // Send purge
 957                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 958                         $update->doUpdate();
 959                 }
 960
 961                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 962                         if ( $this->mTitle->exists() ) {
 963                                 $text = $this->getNativeData(); #FIXME: may not be a string. check Content model!
 964                         } else {
 965                                 $text = false;
 966                         }
 967
 968                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 969                 }
 970                 return true;
 971         }
 972
 973         /**
 974          * Insert a new empty page record for this article.
 975          * This *must* be followed up by creating a revision
 976          * and running $this->updateRevisionOn( ... );
 977          * or else the record will be left in a funky state.
 978          * Best if all done inside a transaction.
 979          *
 980          * @param $dbw DatabaseBase
 981          * @return int The newly created page_id key, or false if the title already existed
 982          */
 983         public function insertOn( $dbw ) {
 984                 wfProfileIn( __METHOD__ );
 985
 986                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 987                 $dbw->insert( 'page', array(
 988                         'page_id'           => $page_id,
 989                         'page_namespace'    => $this->mTitle->getNamespace(),
 990                         'page_title'        => $this->mTitle->getDBkey(),
 991                         'page_counter'      => 0,
 992                         'page_restrictions' => '',
 993                         'page_is_redirect'  => 0, # Will set this shortly...
 994                         'page_is_new'       => 1,
 995                         'page_random'       => wfRandom(),
 996                         'page_touched'      => $dbw->timestamp(),
 997                         'page_latest'       => 0, # Fill this in shortly...
 998                         'page_len'          => 0, # Fill this in shortly...
 999                 ), __METHOD__, 'IGNORE' );
1000
1001                 $affected = $dbw->affectedRows();
1002
1003                 if ( $affected ) {
1004                         $newid = $dbw->insertId();
1005                         $this->mTitle->resetArticleID( $newid );
1006                 }
1007                 wfProfileOut( __METHOD__ );
1008
1009                 return $affected ? $newid : false;
1010         }
1011
1012         /**
1013          * Update the page record to point to a newly saved revision.
1014          *
1015          * @param $dbw DatabaseBase: object
1016          * @param $revision Revision: For ID number, and text used to set
1017          *                  length and redirect status fields
1018          * @param $lastRevision Integer: if given, will not overwrite the page field
1019          *                      when different from the currently set value.
1020          *                      Giving 0 indicates the new page flag should be set
1021          *                      on.
1022          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1023          *                           removing rows in redirect table.
1024          * @return bool true on success, false on failure
1025          * @private
1026          */
1027         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1028                 wfProfileIn( __METHOD__ );
1029
1030         $content = $revision->getContent();
1031                 $len = $content->getSize();
1032                 $rt = $content->getUltimateRedirectTarget();
1033
1034                 $conditions = array( 'page_id' => $this->getId() );
1035
1036                 if ( !is_null( $lastRevision ) ) {
1037                         # An extra check against threads stepping on each other
1038                         $conditions['page_latest'] = $lastRevision;
1039                 }
1040
1041                 $now = wfTimestampNow();
1042                 $dbw->update( 'page',
1043                         array( /* SET */
1044                                 'page_latest'      => $revision->getId(),
1045                                 'page_touched'     => $dbw->timestamp( $now ),
1046                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1047                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1048                                 'page_len'         => $len,
1049                         ),
1050                         $conditions,
1051                         __METHOD__ );
1052
1053                 $result = $dbw->affectedRows() != 0;
1054                 if ( $result ) {
1055                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1056                         $this->setLastEdit( $revision );
1057                         $this->setCachedLastEditTime( $now );
1058                         $this->mLatest = $revision->getId();
1059                         $this->mIsRedirect = (bool)$rt;
1060                         # Update the LinkCache.
1061                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1062                 }
1063
1064                 wfProfileOut( __METHOD__ );
1065                 return $result;
1066         }
1067
1068         /**
1069          * Add row to the redirect table if this is a redirect, remove otherwise.
1070          *
1071          * @param $dbw DatabaseBase
1072          * @param $redirectTitle Title object pointing to the redirect target,
1073          *                       or NULL if this is not a redirect
1074          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1075          *                           removing rows in redirect table.
1076          * @return bool true on success, false on failure
1077          * @private
1078          */
1079         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1080                 // Always update redirects (target link might have changed)
1081                 // Update/Insert if we don't know if the last revision was a redirect or not
1082                 // Delete if changing from redirect to non-redirect
1083                 $isRedirect = !is_null( $redirectTitle );
1084
1085                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1086                         return true;
1087                 }
1088
1089                 wfProfileIn( __METHOD__ );
1090                 if ( $isRedirect ) {
1091                         $this->insertRedirectEntry( $redirectTitle );
1092                 } else {
1093                         // This is not a redirect, remove row from redirect table
1094                         $where = array( 'rd_from' => $this->getId() );
1095                         $dbw->delete( 'redirect', $where, __METHOD__ );
1096                 }
1097
1098                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1099                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1100                 }
1101                 wfProfileOut( __METHOD__ );
1102
1103                 return ( $dbw->affectedRows() != 0 );
1104         }
1105
1106         /**
1107          * If the given revision is newer than the currently set page_latest,
1108          * update the page record. Otherwise, do nothing.
1109          *
1110          * @param $dbw DatabaseBase object
1111          * @param $revision Revision object
1112          * @return mixed
1113          */
1114         public function updateIfNewerOn( $dbw, $revision ) {
1115                 wfProfileIn( __METHOD__ );
1116
1117                 $row = $dbw->selectRow(
1118                         array( 'revision', 'page' ),
1119                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1120                         array(
1121                                 'page_id' => $this->getId(),
1122                                 'page_latest=rev_id' ),
1123                         __METHOD__ );
1124
1125                 if ( $row ) {
1126                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1127                                 wfProfileOut( __METHOD__ );
1128                                 return false;
1129                         }
1130                         $prev = $row->rev_id;
1131                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1132                 } else {
1133                         # No or missing previous revision; mark the page as new
1134                         $prev = 0;
1135                         $lastRevIsRedirect = null;
1136                 }
1137
1138                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1139
1140                 wfProfileOut( __METHOD__ );
1141                 return $ret;
1142         }
1143
1144         /**
1145          * Get the text that needs to be saved in order to undo all revisions
1146          * between $undo and $undoafter. Revisions must belong to the same page,
1147          * must exist and must not be deleted
1148          * @param $undo Revision
1149          * @param $undoafter Revision Must be an earlier revision than $undo
1150          * @return mixed string on success, false on failure
1151      * @deprecated since 1.20: use ContentHandler::getUndoContent() instead.
1152          */
1153         public function getUndoText( Revision $undo, Revision $undoafter = null ) { #FIXME: replace usages.
1154         $this->loadLastEdit();
1155
1156         if ( $this->mLastRevision ) {
1157             $handler = ContentHandler::getForTitle( $this->getTitle() );
1158             $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1159
1160             if ( !$undone ) {
1161                 return false;
1162             } else {
1163                 return ContentHandler::getContentText( $undone );
1164             }
1165         }
1166
1167         return false;
1168         }
1169
1170         /**
1171          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1172          * @param $text String: new text of the section
1173          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1174          * @param $edittime String: revision timestamp or null to use the current revision
1175          * @return Content new complete article content, or null if error
1176      * @deprected since 1.20, use replaceSectionContent() instead
1177          */
1178         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) { #FIXME: use replaceSectionContent() instead!
1179         wfDeprecated( __METHOD__, '1.20' );
1180
1181         $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() ); #XXX: could make section title, but that's not required.
1182
1183         $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1184
1185                 return ContentHandler::getContentText( $newContent ); #XXX: unclear what will happen for non-wikitext!
1186         }
1187
1188     public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1189         wfProfileIn( __METHOD__ );
1190
1191         if ( strval( $section ) == '' ) {
1192             // Whole-page edit; let the whole text through
1193             $newContent = $sectionContent;
1194         } else {
1195             // Bug 30711: always use current version when adding a new section
1196             if ( is_null( $edittime ) || $section == 'new' ) {
1197                 $oldContent = $this->getContent();
1198                 if ( ! $oldContent ) {
1199                     wfDebug( __METHOD__ . ": no page text\n" );
1200                     wfProfileOut( __METHOD__ );
1201                     return null;
1202                 }
1203             } else {
1204                 $dbw = wfGetDB( DB_MASTER );
1205                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1206
1207                 if ( !$rev ) {
1208                     wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1209                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1210                     wfProfileOut( __METHOD__ );
1211                     return null;
1212                 }
1213
1214                 $oldContent = $rev->getContent();
1215             }
1216
1217             $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1218         }
1219
1220         wfProfileOut( __METHOD__ );
1221         return $newContent;
1222     }
1223
1224         /**
1225          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1226          * @param $flags Int
1227          * @return Int updated $flags
1228          */
1229         function checkFlags( $flags ) {
1230                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1231                         if ( $this->mTitle->getArticleID() ) {
1232                                 $flags |= EDIT_UPDATE;
1233                         } else {
1234                                 $flags |= EDIT_NEW;
1235                         }
1236                 }
1237
1238                 return $flags;
1239         }
1240
1241         /**
1242          * Change an existing article or create a new article. Updates RC and all necessary caches,
1243          * optionally via the deferred update array.
1244          *
1245          * @param $text String: new text
1246          * @param $summary String: edit summary
1247          * @param $flags Integer bitfield:
1248          *      EDIT_NEW
1249          *          Article is known or assumed to be non-existent, create a new one
1250          *      EDIT_UPDATE
1251          *          Article is known or assumed to be pre-existing, update it
1252          *      EDIT_MINOR
1253          *          Mark this edit minor, if the user is allowed to do so
1254          *      EDIT_SUPPRESS_RC
1255          *          Do not log the change in recentchanges
1256          *      EDIT_FORCE_BOT
1257          *          Mark the edit a "bot" edit regardless of user rights
1258          *      EDIT_DEFER_UPDATES
1259          *          Defer some of the updates until the end of index.php
1260          *      EDIT_AUTOSUMMARY
1261          *          Fill in blank summaries with generated text where possible
1262          *
1263          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1264          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1265          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1266          * edit-already-exists error will be returned. These two conditions are also possible with
1267          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1268          *
1269          * @param $baseRevId int the revision ID this edit was based off, if any
1270          * @param $user User the user doing the edit
1271          *
1272          * @return Status object. Possible errors:
1273          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1274          *     edit-gone-missing:       In update mode, but the article didn't exist
1275          *     edit-conflict:           In update mode, the article changed unexpectedly
1276          *     edit-no-change:          Warning that the text was the same as before
1277          *     edit-already-exists:     In creation mode, but the article already exists
1278          *
1279          *  Extensions may define additional errors.
1280          *
1281          *  $return->value will contain an associative array with members as follows:
1282          *     new:                     Boolean indicating if the function attempted to create a new article
1283          *     revision:                The revision object for the inserted revision, or null
1284          *
1285          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1286      * @deprecated since 1.20: use doEditContent() instead.
1287          */
1288     public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) { #FIXME: use doEditContent() instead
1289         #TODO: log use of deprecated function
1290         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1291
1292         return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1293     }
1294
1295     /**
1296      * Change an existing article or create a new article. Updates RC and all necessary caches,
1297      * optionally via the deferred update array.
1298      *
1299      * @param $content Content: new content
1300      * @param $summary String: edit summary
1301      * @param $flags Integer bitfield:
1302      *      EDIT_NEW
1303      *          Article is known or assumed to be non-existent, create a new one
1304      *      EDIT_UPDATE
1305      *          Article is known or assumed to be pre-existing, update it
1306      *      EDIT_MINOR
1307      *          Mark this edit minor, if the user is allowed to do so
1308      *      EDIT_SUPPRESS_RC
1309      *          Do not log the change in recentchanges
1310      *      EDIT_FORCE_BOT
1311      *          Mark the edit a "bot" edit regardless of user rights
1312      *      EDIT_DEFER_UPDATES
1313      *          Defer some of the updates until the end of index.php
1314      *      EDIT_AUTOSUMMARY
1315      *          Fill in blank summaries with generated text where possible
1316      *
1317      * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1318      * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1319      * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1320      * edit-already-exists error will be returned. These two conditions are also possible with
1321      * auto-detection due to MediaWiki's performance-optimised locking strategy.
1322      *
1323      * @param $baseRevId the revision ID this edit was based off, if any
1324      * @param $user User the user doing the edit
1325      * @param $serialisation_format String: format for storing the content in the database
1326      *
1327      * @return Status object. Possible errors:
1328      *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1329      *     edit-gone-missing:       In update mode, but the article didn't exist
1330      *     edit-conflict:           In update mode, the article changed unexpectedly
1331      *     edit-no-change:          Warning that the text was the same as before
1332      *     edit-already-exists:     In creation mode, but the article already exists
1333      *
1334      *  Extensions may define additional errors.
1335      *
1336      *  $return->value will contain an associative array with members as follows:
1337      *     new:                     Boolean indicating if the function attempted to create a new article
1338      *     revision:                The revision object for the inserted revision, or null
1339      *
1340      *  Compatibility note: this function previously returned a boolean value indicating success/failure
1341      */
1342         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1343                                    User $user = null, $serialisation_format = null ) { #FIXME: use this
1344                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1345
1346                 # Low-level sanity check
1347                 if ( $this->mTitle->getText() === '' ) {
1348                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1349                 }
1350
1351                 wfProfileIn( __METHOD__ );
1352
1353                 $user = is_null( $user ) ? $wgUser : $user;
1354                 $status = Status::newGood( array() );
1355
1356                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1357                 $this->loadPageData( 'fromdbmaster' );
1358
1359                 $flags = $this->checkFlags( $flags );
1360
1361         # call legacy hook
1362         $hook_ok = wfRunHooks( 'ArticleContentSave', array( &$this, &$user, &$content, &$summary, #FIXME: document new hook!
1363             $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1364
1365         if ( $hook_ok && !empty( $wgHooks['ArticleSave'] ) ) { # avoid serialization overhead if the hook isn't present
1366             $content_text = $content->serialize();
1367             $txt = $content_text; # clone
1368
1369             $hook_ok = wfRunHooks( 'ArticleSave', array( &$this, &$user, &$txt, &$summary, #FIXME: deprecate legacy hook!
1370                 $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1371
1372             if ( $txt !== $content_text ) {
1373                 # if the text changed, unserialize the new version to create an updated Content object.
1374                 $content = $content->getContentHandler()->unserialize( $txt );
1375             }
1376         }
1377
1378                 if ( !$hook_ok ) {
1379                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1380
1381                         if ( $status->isOK() ) {
1382                                 $status->fatal( 'edit-hook-aborted' );
1383                         }
1384
1385                         wfProfileOut( __METHOD__ );
1386                         return $status;
1387                 }
1388
1389                 # Silently ignore EDIT_MINOR if not allowed
1390                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1391                 $bot = $flags & EDIT_FORCE_BOT;
1392
1393                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1394
1395                 $oldsize = $old_content ? $old_content->getSize() : 0;
1396                 $oldid = $this->getLatest();
1397                 $oldIsRedirect = $this->isRedirect();
1398                 $oldcountable = $this->isCountable();
1399
1400         $handler = $content->getContentHandler();
1401
1402                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1403                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1404             if ( !$old_content ) $old_content = null;
1405                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1406                 }
1407
1408                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1409                 $serialized = $editInfo->pst;
1410         $content = $editInfo->pstContent;
1411                 $newsize =  $content->getSize();
1412
1413                 $dbw = wfGetDB( DB_MASTER );
1414                 $now = wfTimestampNow();
1415                 $this->mTimestamp = $now;
1416
1417                 if ( $flags & EDIT_UPDATE ) {
1418                         # Update article, but only if changed.
1419                         $status->value['new'] = false;
1420
1421                         if ( !$oldid ) {
1422                                 # Article gone missing
1423                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1424                                 $status->fatal( 'edit-gone-missing' );
1425
1426                                 wfProfileOut( __METHOD__ );
1427                                 return $status;
1428                         }
1429
1430                         # Make sure the revision is either completely inserted or not inserted at all
1431                         if ( !$wgDBtransactions ) {
1432                                 $userAbort = ignore_user_abort( true );
1433                         }
1434
1435                         $revision = new Revision( array(
1436                                 'page'       => $this->getId(),
1437                                 'comment'    => $summary,
1438                                 'minor_edit' => $isminor,
1439                                 'text'       => $serialized,
1440                 'len'        => $newsize,
1441                                 'parent_id'  => $oldid,
1442                                 'user'       => $user->getId(),
1443                                 'user_text'  => $user->getName(),
1444                                 'timestamp'  => $now,
1445                 'content_model' => $content->getModelName(),
1446                 'content_format' => $serialisation_format,
1447                         ) );
1448
1449                         $changed = !$content->equals( $old_content );
1450
1451                         if ( $changed ) {
1452                                 $dbw->begin( __METHOD__ );
1453                                 $revisionId = $revision->insertOn( $dbw );
1454
1455                                 # Update page
1456                                 #
1457                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1458                                 # during the course of this function. This makes sure that EditPage can detect
1459                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1460                                 # before this function is called. A previous function used a separate query, this
1461                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1462                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1463
1464                                 if ( !$ok ) {
1465                                         /* Belated edit conflict! Run away!! */
1466                                         $status->fatal( 'edit-conflict' );
1467
1468                                         # Delete the invalid revision if the DB is not transactional
1469                                         if ( !$wgDBtransactions ) {
1470                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1471                                         }
1472
1473                                         $revisionId = 0;
1474                                         $dbw->rollback( __METHOD__ );
1475                                 } else {
1476                                         global $wgUseRCPatrol;
1477                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1478                                         # Update recentchanges
1479                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1480                                                 # Mark as patrolled if the user can do so
1481                                                 $patrolled = $wgUseRCPatrol && !count(
1482                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1483                                                 # Add RC row to the DB
1484                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1485                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1486                                                         $revisionId, $patrolled
1487                                                 );
1488
1489                                                 # Log auto-patrolled edits
1490                                                 if ( $patrolled ) {
1491                                                         PatrolLog::record( $rc, true, $user );
1492                                                 }
1493                                         }
1494                                         $user->incEditCount();
1495                                         $dbw->commit( __METHOD__ );
1496                                 }
1497                         } else {
1498                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1499                                 // related variables correctly
1500                                 $revision->setId( $this->getLatest() );
1501                         }
1502
1503                         if ( !$wgDBtransactions ) {
1504                                 ignore_user_abort( $userAbort );
1505                         }
1506
1507                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1508                         if ( !$status->isOK() ) {
1509                                 wfProfileOut( __METHOD__ );
1510                                 return $status;
1511                         }
1512
1513                         # Update links tables, site stats, etc.
1514                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1515                                 'oldcountable' => $oldcountable ) );
1516
1517                         if ( !$changed ) {
1518                                 $status->warning( 'edit-no-change' );
1519                                 $revision = null;
1520                                 // Update page_touched, this is usually implicit in the page update
1521                                 // Other cache updates are done in onArticleEdit()
1522                                 $this->mTitle->invalidateCache();
1523                         }
1524                 } else {
1525                         # Create new article
1526                         $status->value['new'] = true;
1527
1528                         $dbw->begin( __METHOD__ );
1529
1530                         # Add the page record; stake our claim on this title!
1531                         # This will return false if the article already exists
1532                         $newid = $this->insertOn( $dbw );
1533
1534                         if ( $newid === false ) {
1535                                 $dbw->rollback( __METHOD__ );
1536                                 $status->fatal( 'edit-already-exists' );
1537
1538                                 wfProfileOut( __METHOD__ );
1539                                 return $status;
1540                         }
1541
1542                         # Save the revision text...
1543                         $revision = new Revision( array(
1544                                 'page'       => $newid,
1545                                 'comment'    => $summary,
1546                                 'minor_edit' => $isminor,
1547                                 'text'       => $serialized,
1548                 'len'        => $newsize,
1549                                 'user'       => $user->getId(),
1550                                 'user_text'  => $user->getName(),
1551                                 'timestamp'  => $now,
1552                 'content_model' => $content->getModelName(),
1553                 'content_format' => $serialisation_format,
1554                         ) );
1555                         $revisionId = $revision->insertOn( $dbw );
1556
1557                         # Update the page record with revision data
1558                         $this->updateRevisionOn( $dbw, $revision, 0 );
1559
1560                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1561
1562                         # Update recentchanges
1563                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1564                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1565
1566                                 # Mark as patrolled if the user can do so
1567                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1568                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1569                                 # Add RC row to the DB
1570                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1571                                         '', $content->getSize(), $revisionId, $patrolled );
1572
1573                                 # Log auto-patrolled edits
1574                                 if ( $patrolled ) {
1575                                         PatrolLog::record( $rc, true, $user );
1576                                 }
1577                         }
1578                         $user->incEditCount();
1579                         $dbw->commit( __METHOD__ );
1580
1581                         # Update links, etc.
1582                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1583
1584                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $serialized, $summary, #FIXME: deprecate legacy hook
1585                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1586
1587             wfRunHooks( 'ArticleContentInsertComplete', array( &$this, &$user, $content, $summary, #FIXME: document new hook
1588                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1589                 }
1590
1591                 # Do updates right now unless deferral was requested
1592                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1593                         DeferredUpdates::doUpdates();
1594                 }
1595
1596                 // Return the new revision (or null) to the caller
1597                 $status->value['revision'] = $revision;
1598
1599                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $serialized, $summary,  #FIXME: deprecate legacy hook
1600                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1601
1602         wfRunHooks( 'ArticleContentSaveComplete', array( &$this, &$user, $content, $summary, #FIXME: document new hook
1603             $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1604
1605                 # Promote user to any groups they meet the criteria for
1606                 $user->addAutopromoteOnceGroups( 'onEdit' );
1607
1608                 wfProfileOut( __METHOD__ );
1609                 return $status;
1610         }
1611
1612         /**
1613          * Get parser options suitable for rendering the primary article wikitext
1614          * @param User|string $user User object or 'canonical'
1615          * @return ParserOptions
1616          */
1617         public function makeParserOptions( $user ) {
1618                 global $wgContLang;
1619                 if ( $user instanceof User ) { // settings per user (even anons)
1620                         $options = ParserOptions::newFromUser( $user );
1621                 } else { // canonical settings
1622                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1623                 }
1624                 $options->enableLimitReport(); // show inclusion/loop reports
1625                 $options->setTidy( true ); // fix bad HTML
1626                 return $options;
1627         }
1628
1629         /**
1630          * Prepare text which is about to be saved.
1631          * Returns a stdclass with source, pst and output members
1632      * @deprecated in 1.20: use prepareContentForEdit instead.
1633          */
1634     public function prepareTextForEdit( $text, $revid = null, User $user = null ) {  #FIXME: use prepareContentForEdit() instead #XXX: who uses this?!
1635         #TODO: log use of deprecated function
1636         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1637         return $this->prepareContentForEdit( $content, $revid , $user );
1638     }
1639
1640     /**
1641      * Prepare content which is about to be saved.
1642      * Returns a stdclass with source, pst and output members
1643      *
1644      * @param \Content $content
1645      * @param null $revid
1646      * @param null|\User $user
1647      * @param null $serialization_format
1648      * @return bool|object
1649      */
1650         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) { #FIXME: use this #XXX: really public?!
1651                 global $wgParser, $wgContLang, $wgUser;
1652                 $user = is_null( $user ) ? $wgUser : $user;
1653                 // @TODO fixme: check $user->getId() here???
1654
1655                 if ( $this->mPreparedEdit
1656                         && $this->mPreparedEdit->newContent
1657             && $this->mPreparedEdit->newContent->equals( $content )
1658                         && $this->mPreparedEdit->revid == $revid
1659             && $this->mPreparedEdit->format == $serialization_format
1660             #XXX: also check $user here?
1661                 ) {
1662                         // Already prepared
1663                         return $this->mPreparedEdit;
1664                 }
1665
1666                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1667                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1668
1669                 $edit = (object)array();
1670                 $edit->revid = $revid;
1671
1672                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1673         $edit->pst = $edit->pstContent->serialize( $serialization_format );
1674         $edit->format = $serialization_format;
1675
1676                 $edit->popts = $this->makeParserOptions( 'canonical' );
1677                 $edit->output = $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts );
1678
1679         $edit->newContent = $content;
1680                 $edit->oldContent = $this->getContent( Revision::RAW );
1681
1682         $edit->newText = ContentHandler::getContentText( $edit->newContent ); #FIXME: B/C only! don't use this field!
1683         $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : ''; #FIXME: B/C only! don't use this field!
1684
1685                 $this->mPreparedEdit = $edit;
1686
1687                 return $edit;
1688         }
1689
1690         /**
1691          * Do standard deferred updates after page edit.
1692          * Update links tables, site stats, search index and message cache.
1693          * Purges pages that include this page if the text was changed here.
1694          * Every 100th edit, prune the recent changes table.
1695          *
1696          * @private
1697          * @param $revision Revision object
1698          * @param $user User object that did the revision
1699          * @param $options Array of options, following indexes are used:
1700          * - changed: boolean, whether the revision changed the content (default true)
1701          * - created: boolean, whether the revision created the page (default false)
1702          * - oldcountable: boolean or null (default null):
1703          *   - boolean: whether the page was counted as an article before that
1704          *     revision, only used in changed is true and created is false
1705          *   - null: don't change the article count
1706          */
1707         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1708                 global $wgEnableParserCache;
1709
1710                 wfProfileIn( __METHOD__ );
1711
1712                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1713         $content = $revision->getContent();
1714
1715                 # Parse the text
1716                 # Be careful not to double-PST: $text is usually already PST-ed once
1717                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1718                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1719                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
1720                 } else {
1721                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1722                         $editInfo = $this->mPreparedEdit;
1723                 }
1724
1725                 # Save it to the parser cache
1726                 if ( $wgEnableParserCache ) {
1727                         $parserCache = ParserCache::singleton();
1728                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1729                 }
1730
1731                 # Update the links tables and other secondary data
1732         $updates = $editInfo->output->getLinksUpdateAndOtherUpdates( $this->mTitle );
1733         SecondaryDataUpdate::runUpdates( $updates );
1734
1735                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1736
1737                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1738                         if ( 0 == mt_rand( 0, 99 ) ) {
1739                                 // Flush old entries from the `recentchanges` table; we do this on
1740                                 // random requests so as to avoid an increase in writes for no good reason
1741                                 global $wgRCMaxAge;
1742
1743                                 $dbw = wfGetDB( DB_MASTER );
1744                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1745                                 $dbw->delete(
1746                                         'recentchanges',
1747                                         array( "rc_timestamp < '$cutoff'" ),
1748                                         __METHOD__
1749                                 );
1750                         }
1751                 }
1752
1753                 if ( !$this->mTitle->exists() ) {
1754                         wfProfileOut( __METHOD__ );
1755                         return;
1756                 }
1757
1758                 $id = $this->getId();
1759                 $title = $this->mTitle->getPrefixedDBkey();
1760                 $shortTitle = $this->mTitle->getDBkey();
1761
1762                 if ( !$options['changed'] ) {
1763                         $good = 0;
1764                         $total = 0;
1765                 } elseif ( $options['created'] ) {
1766                         $good = (int)$this->isCountable( $editInfo );
1767                         $total = 1;
1768                 } elseif ( $options['oldcountable'] !== null ) {
1769                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1770                         $total = 0;
1771                 } else {
1772                         $good = 0;
1773                         $total = 0;
1774                 }
1775
1776                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1777         DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) );
1778
1779                 # If this is another user's talk page, update newtalk.
1780                 # Don't do this if $options['changed'] = false (null-edits) nor if
1781                 # it's a minor edit and the user doesn't want notifications for those.
1782                 if ( $options['changed']
1783                         && $this->mTitle->getNamespace() == NS_USER_TALK
1784                         && $shortTitle != $user->getTitleKey()
1785                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1786                 ) {
1787                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1788                                 $other = User::newFromName( $shortTitle, false );
1789                                 if ( !$other ) {
1790                                         wfDebug( __METHOD__ . ": invalid username\n" );
1791                                 } elseif ( User::isIP( $shortTitle ) ) {
1792                                         // An anonymous user
1793                                         $other->setNewtalk( true );
1794                                 } elseif ( $other->isLoggedIn() ) {
1795                                         $other->setNewtalk( true );
1796                                 } else {
1797                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1798                                 }
1799                         }
1800                 }
1801
1802                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1803             $msgtext = ContentHandler::getContentText( $content ); #XXX: could skip pseudo-messages like js/css here, based on content model.
1804             if ( $msgtext === false || $msgtext === null ) $msgtext = '';
1805
1806                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
1807                 }
1808
1809                 if( $options['created'] ) {
1810                         self::onArticleCreate( $this->mTitle );
1811                 } else {
1812                         self::onArticleEdit( $this->mTitle );
1813                 }
1814
1815                 wfProfileOut( __METHOD__ );
1816         }
1817
1818         /**
1819          * Edit an article without doing all that other stuff
1820          * The article must already exist; link tables etc
1821          * are not updated, caches are not flushed.
1822          *
1823          * @param $text String: text submitted
1824          * @param $user User The relevant user
1825          * @param $comment String: comment submitted
1826          * @param $minor Boolean: whereas it's a minor modification
1827          */
1828     public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1829         #TODO: log use of deprecated function
1830         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1831         return $this->doQuickEdit( $content, $user, $comment , $minor );
1832     }
1833
1834     /**
1835      * Edit an article without doing all that other stuff
1836      * The article must already exist; link tables etc
1837      * are not updated, caches are not flushed.
1838      *
1839      * @param $content Content: content submitted
1840      * @param $user User The relevant user
1841      * @param $comment String: comment submitted
1842      * @param $serialisation_format String: format for storing the content in the database
1843      * @param $minor Boolean: whereas it's a minor modification
1844      */
1845         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
1846                 wfProfileIn( __METHOD__ );
1847
1848         $serialized = $content->serialize( $serialisation_format );
1849
1850                 $dbw = wfGetDB( DB_MASTER );
1851                 $revision = new Revision( array(
1852                         'page'       => $this->getId(),
1853                         'text'       => $serialized,
1854             'length'     => $content->getSize(),
1855                         'comment'    => $comment,
1856                         'minor_edit' => $minor ? 1 : 0,
1857                 ) );
1858                 $revision->insertOn( $dbw );
1859                 $this->updateRevisionOn( $dbw, $revision );
1860
1861                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1862
1863                 wfProfileOut( __METHOD__ );
1864         }
1865
1866         /**
1867          * Update the article's restriction field, and leave a log entry.
1868          * This works for protection both existing and non-existing pages.
1869          *
1870          * @param $limit Array: set of restriction keys
1871          * @param $reason String
1872          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1873          * @param $expiry Array: per restriction type expiration
1874          * @param $user User The user updating the restrictions
1875          * @return bool true on success
1876          */
1877         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1878                 global $wgContLang;
1879
1880                 if ( wfReadOnly() ) {
1881                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1882                 }
1883
1884                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1885
1886                 $id = $this->mTitle->getArticleID();
1887
1888                 if ( !$cascade ) {
1889                         $cascade = false;
1890                 }
1891
1892                 // Take this opportunity to purge out expired restrictions
1893                 Title::purgeExpiredRestrictions();
1894
1895                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1896                 # we expect a single selection, but the schema allows otherwise.
1897                 $isProtected = false;
1898                 $protect = false;
1899                 $changed = false;
1900
1901                 $dbw = wfGetDB( DB_MASTER );
1902
1903                 foreach ( $restrictionTypes as $action ) {
1904                         if ( !isset( $expiry[$action] ) ) {
1905                                 $expiry[$action] = $dbw->getInfinity();
1906                         }
1907                         if ( !isset( $limit[$action] ) ) {
1908                                 $limit[$action] = '';
1909                         } elseif ( $limit[$action] != '' ) {
1910                                 $protect = true;
1911                         }
1912
1913                         # Get current restrictions on $action
1914                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1915                         if ( $current != '' ) {
1916                                 $isProtected = true;
1917                         }
1918
1919                         if ( $limit[$action] != $current ) {
1920                                 $changed = true;
1921                         } elseif ( $limit[$action] != '' ) {
1922                                 # Only check expiry change if the action is actually being
1923                                 # protected, since expiry does nothing on an not-protected
1924                                 # action.
1925                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1926                                         $changed = true;
1927                                 }
1928                         }
1929                 }
1930
1931                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1932                         $changed = true;
1933                 }
1934
1935                 # If nothing's changed, do nothing
1936                 if ( !$changed ) {
1937                         return Status::newGood();
1938                 }
1939
1940                 if ( !$protect ) { # No protection at all means unprotection
1941                         $revCommentMsg = 'unprotectedarticle';
1942                         $logAction = 'unprotect';
1943                 } elseif ( $isProtected ) {
1944                         $revCommentMsg = 'modifiedarticleprotection';
1945                         $logAction = 'modify';
1946                 } else {
1947                         $revCommentMsg = 'protectedarticle';
1948                         $logAction = 'protect';
1949                 }
1950
1951                 $encodedExpiry = array();
1952                 $protectDescription = '';
1953                 foreach ( $limit as $action => $restrictions ) {
1954                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1955                         if ( $restrictions != '' ) {
1956                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1957                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1958                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
1959                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1960                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1961                                                 $wgContLang->time( $expiry[$action], false, false ) );
1962                                 } else {
1963                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
1964                                 }
1965
1966                                 $protectDescription .= ') ';
1967                         }
1968                 }
1969                 $protectDescription = trim( $protectDescription );
1970
1971                 if ( $id ) { # Protection of existing page
1972                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1973                                 return Status::newGood();
1974                         }
1975
1976                         # Only restrictions with the 'protect' right can cascade...
1977                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1978                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1979
1980                         # The schema allows multiple restrictions
1981                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1982                                 $cascade = false;
1983                         }
1984
1985                         # Update restrictions table
1986                         foreach ( $limit as $action => $restrictions ) {
1987                                 if ( $restrictions != '' ) {
1988                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1989                                                 array( 'pr_page' => $id,
1990                                                         'pr_type' => $action,
1991                                                         'pr_level' => $restrictions,
1992                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1993                                                         'pr_expiry' => $encodedExpiry[$action]
1994                                                 ),
1995                                                 __METHOD__
1996                                         );
1997                                 } else {
1998                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1999                                                 'pr_type' => $action ), __METHOD__ );
2000                                 }
2001                         }
2002
2003                         # Prepare a null revision to be added to the history
2004                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
2005                         if ( $reason ) {
2006                                 $editComment .= ": $reason";
2007                         }
2008                         if ( $protectDescription ) {
2009                                 $editComment .= " ($protectDescription)";
2010                         }
2011                         if ( $cascade ) {
2012                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2013                         }
2014
2015                         # Insert a null revision
2016                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2017                         $nullRevId = $nullRevision->insertOn( $dbw );
2018
2019                         $latest = $this->getLatest();
2020                         # Update page record
2021                         $dbw->update( 'page',
2022                                 array( /* SET */
2023                                         'page_touched' => $dbw->timestamp(),
2024                                         'page_restrictions' => '',
2025                                         'page_latest' => $nullRevId
2026                                 ), array( /* WHERE */
2027                                         'page_id' => $id
2028                                 ), __METHOD__
2029                         );
2030
2031                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2032                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2033                 } else { # Protection of non-existing page (also known as "title protection")
2034                         # Cascade protection is meaningless in this case
2035                         $cascade = false;
2036
2037                         if ( $limit['create'] != '' ) {
2038                                 $dbw->replace( 'protected_titles',
2039                                         array( array( 'pt_namespace', 'pt_title' ) ),
2040                                         array(
2041                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2042                                                 'pt_title' => $this->mTitle->getDBkey(),
2043                                                 'pt_create_perm' => $limit['create'],
2044                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2045                                                 'pt_expiry' => $encodedExpiry['create'],
2046                                                 'pt_user' => $user->getId(),
2047                                                 'pt_reason' => $reason,
2048                                         ), __METHOD__
2049                                 );
2050                         } else {
2051                                 $dbw->delete( 'protected_titles',
2052                                         array(
2053                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2054                                                 'pt_title' => $this->mTitle->getDBkey()
2055                                         ), __METHOD__
2056                                 );
2057                         }
2058                 }
2059
2060                 $this->mTitle->flushRestrictions();
2061
2062                 if ( $logAction == 'unprotect' ) {
2063                         $logParams = array();
2064                 } else {
2065                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2066                 }
2067
2068                 # Update the protection log
2069                 $log = new LogPage( 'protect' );
2070                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2071
2072                 return Status::newGood();
2073         }
2074
2075         /**
2076          * Take an array of page restrictions and flatten it to a string
2077          * suitable for insertion into the page_restrictions field.
2078          * @param $limit Array
2079          * @return String
2080          */
2081         protected static function flattenRestrictions( $limit ) {
2082                 if ( !is_array( $limit ) ) {
2083                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2084                 }
2085
2086                 $bits = array();
2087                 ksort( $limit );
2088
2089                 foreach ( $limit as $action => $restrictions ) {
2090                         if ( $restrictions != '' ) {
2091                                 $bits[] = "$action=$restrictions";
2092                         }
2093                 }
2094
2095                 return implode( ':', $bits );
2096         }
2097
2098         /**
2099          * Same as doDeleteArticleReal(), but returns more detailed success/failure status
2100          * Deletes the article with database consistency, writes logs, purges caches
2101          *
2102          * @param $reason string delete reason for deletion log
2103          * @param $suppress int bitfield
2104          *      Revision::DELETED_TEXT
2105          *      Revision::DELETED_COMMENT
2106          *      Revision::DELETED_USER
2107          *      Revision::DELETED_RESTRICTED
2108          * @param $id int article ID
2109          * @param $commit boolean defaults to true, triggers transaction end
2110          * @param &$error Array of errors to append to
2111          * @param $user User The deleting user
2112          * @return boolean true if successful
2113          */
2114         public function doDeleteArticle(
2115                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2116         ) {
2117                 return $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user )
2118                         == WikiPage::DELETE_SUCCESS;
2119         }
2120
2121         /**
2122          * Back-end article deletion
2123          * Deletes the article with database consistency, writes logs, purges caches
2124          *
2125          * @param $reason string delete reason for deletion log
2126          * @param $suppress int bitfield
2127          *      Revision::DELETED_TEXT
2128          *      Revision::DELETED_COMMENT
2129          *      Revision::DELETED_USER
2130          *      Revision::DELETED_RESTRICTED
2131          * @param $id int article ID
2132          * @param $commit boolean defaults to true, triggers transaction end
2133          * @param &$error Array of errors to append to
2134          * @param $user User The deleting user
2135          * @return int: One of WikiPage::DELETE_* constants
2136          */
2137         public function doDeleteArticleReal(
2138                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2139         ) {
2140                 global $wgUser;
2141                 $user = is_null( $user ) ? $wgUser : $user;
2142
2143                 wfDebug( __METHOD__ . "\n" );
2144
2145                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
2146                         return WikiPage::DELETE_HOOK_ABORTED;
2147                 }
2148                 $dbw = wfGetDB( DB_MASTER );
2149                 $t = $this->mTitle->getDBkey();
2150                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
2151
2152                 if ( $t === '' || $id == 0 ) {
2153                         return WikiPage::DELETE_NO_PAGE;
2154                 }
2155
2156                 // Bitfields to further suppress the content
2157                 if ( $suppress ) {
2158                         $bitfield = 0;
2159                         // This should be 15...
2160                         $bitfield |= Revision::DELETED_TEXT;
2161                         $bitfield |= Revision::DELETED_COMMENT;
2162                         $bitfield |= Revision::DELETED_USER;
2163                         $bitfield |= Revision::DELETED_RESTRICTED;
2164                 } else {
2165                         $bitfield = 'rev_deleted';
2166                 }
2167
2168                 $dbw->begin( __METHOD__ );
2169                 // For now, shunt the revision data into the archive table.
2170                 // Text is *not* removed from the text table; bulk storage
2171                 // is left intact to avoid breaking block-compression or
2172                 // immutable storage schemes.
2173                 //
2174                 // For backwards compatibility, note that some older archive
2175                 // table entries will have ar_text and ar_flags fields still.
2176                 //
2177                 // In the future, we may keep revisions and mark them with
2178                 // the rev_deleted field, which is reserved for this purpose.
2179                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2180                         array(
2181                                 'ar_namespace'  => 'page_namespace',
2182                                 'ar_title'      => 'page_title',
2183                                 'ar_comment'    => 'rev_comment',
2184                                 'ar_user'       => 'rev_user',
2185                                 'ar_user_text'  => 'rev_user_text',
2186                                 'ar_timestamp'  => 'rev_timestamp',
2187                                 'ar_minor_edit' => 'rev_minor_edit',
2188                                 'ar_rev_id'     => 'rev_id',
2189                                 'ar_parent_id'  => 'rev_parent_id',
2190                                 'ar_text_id'    => 'rev_text_id',
2191                                 'ar_text'       => '\'\'', // Be explicit to appease
2192                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2193                                 'ar_len'        => 'rev_len',
2194                                 'ar_page_id'    => 'page_id',
2195                                 'ar_deleted'    => $bitfield,
2196                                 'ar_sha1'       => 'rev_content_model',
2197                                 'ar_content_format'       => 'rev_content_format',
2198                                 'ar_content_format'       => 'rev_sha1'
2199                         ), array(
2200                                 'page_id' => $id,
2201                                 'page_id = rev_page'
2202                         ), __METHOD__
2203                 );
2204
2205                 # Now that it's safely backed up, delete it
2206                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2207                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2208
2209                 if ( !$ok ) {
2210                         $dbw->rollback( __METHOD__ );
2211                         return WikiPage::DELETE_NO_REVISIONS;
2212                 }
2213
2214                 $this->doDeleteUpdates( $id );
2215
2216                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2217                 $logtype = $suppress ? 'suppress' : 'delete';
2218
2219                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2220                 $logEntry->setPerformer( $user );
2221                 $logEntry->setTarget( $this->mTitle );
2222                 $logEntry->setComment( $reason );
2223                 $logid = $logEntry->insert();
2224                 $logEntry->publish( $logid );
2225
2226                 if ( $commit ) {
2227                         $dbw->commit( __METHOD__ );
2228                 }
2229
2230                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2231                 return WikiPage::DELETE_SUCCESS;
2232         }
2233
2234         /**
2235          * Do some database updates after deletion
2236          *
2237          * @param $id Int: page_id value of the page being deleted
2238          */
2239         public function doDeleteUpdates( $id ) {
2240                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2241
2242                 $dbw = wfGetDB( DB_MASTER );
2243
2244                 # Delete restrictions for it
2245                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2246
2247                 # Fix category table counts
2248                 $cats = array();
2249                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2250
2251                 foreach ( $res as $row ) {
2252                         $cats [] = $row->cl_to;
2253                 }
2254
2255                 $this->updateCategoryCounts( array(), $cats );
2256
2257                 # If using cascading deletes, we can skip some explicit deletes
2258                 if ( !$dbw->cascadingDeletes() ) {
2259                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2260
2261                         # Delete outgoing links
2262                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
2263                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
2264                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
2265                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
2266                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
2267                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
2268                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
2269                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
2270                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
2271                 }
2272
2273                 # If using cleanup triggers, we can skip some manual deletes
2274                 if ( !$dbw->cleanupTriggers() ) {
2275                         # Clean up recentchanges entries...
2276                         $dbw->delete( 'recentchanges',
2277                                 array( 'rc_type != ' . RC_LOG,
2278                                         'rc_namespace' => $this->mTitle->getNamespace(),
2279                                         'rc_title' => $this->mTitle->getDBkey() ),
2280                                 __METHOD__ );
2281                         $dbw->delete( 'recentchanges',
2282                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2283                                 __METHOD__ );
2284                 }
2285
2286                 # Clear caches
2287                 self::onArticleDelete( $this->mTitle );
2288
2289                 # Reset this object
2290                 $this->clear();
2291
2292                 # Clear the cached article id so the interface doesn't act like we exist
2293                 $this->mTitle->resetArticleID( 0 );
2294         }
2295
2296         /**
2297          * Roll back the most recent consecutive set of edits to a page
2298          * from the same user; fails if there are no eligible edits to
2299          * roll back to, e.g. user is the sole contributor. This function
2300          * performs permissions checks on $user, then calls commitRollback()
2301          * to do the dirty work
2302          *
2303          * @todo: seperate the business/permission stuff out from backend code
2304          *
2305          * @param $fromP String: Name of the user whose edits to rollback.
2306          * @param $summary String: Custom summary. Set to default summary if empty.
2307          * @param $token String: Rollback token.
2308          * @param $bot Boolean: If true, mark all reverted edits as bot.
2309          *
2310          * @param $resultDetails Array: contains result-specific array of additional values
2311          *    'alreadyrolled' : 'current' (rev)
2312          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2313          *
2314          * @param $user User The user performing the rollback
2315          * @return array of errors, each error formatted as
2316          *   array(messagekey, param1, param2, ...).
2317          * On success, the array is empty.  This array can also be passed to
2318          * OutputPage::showPermissionsErrorPage().
2319          */
2320         public function doRollback(
2321                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2322         ) {
2323                 $resultDetails = null;
2324
2325                 # Check permissions
2326                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2327                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2328                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2329
2330                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2331                         $errors[] = array( 'sessionfailure' );
2332                 }
2333
2334                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2335                         $errors[] = array( 'actionthrottledtext' );
2336                 }
2337
2338                 # If there were errors, bail out now
2339                 if ( !empty( $errors ) ) {
2340                         return $errors;
2341                 }
2342
2343                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2344         }
2345
2346         /**
2347          * Backend implementation of doRollback(), please refer there for parameter
2348          * and return value documentation
2349          *
2350          * NOTE: This function does NOT check ANY permissions, it just commits the
2351          * rollback to the DB. Therefore, you should only call this function direct-
2352          * ly if you want to use custom permissions checks. If you don't, use
2353          * doRollback() instead.
2354          * @param $fromP String: Name of the user whose edits to rollback.
2355          * @param $summary String: Custom summary. Set to default summary if empty.
2356          * @param $bot Boolean: If true, mark all reverted edits as bot.
2357          *
2358          * @param $resultDetails Array: contains result-specific array of additional values
2359          * @param $guser User The user performing the rollback
2360          * @return array
2361          */
2362         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2363                 global $wgUseRCPatrol, $wgContLang;
2364
2365                 $dbw = wfGetDB( DB_MASTER );
2366
2367                 if ( wfReadOnly() ) {
2368                         return array( array( 'readonlytext' ) );
2369                 }
2370
2371                 # Get the last editor
2372                 $current = $this->getRevision();
2373                 if ( is_null( $current ) ) {
2374                         # Something wrong... no page?
2375                         return array( array( 'notanarticle' ) );
2376                 }
2377
2378                 $from = str_replace( '_', ' ', $fromP );
2379                 # User name given should match up with the top revision.
2380                 # If the user was deleted then $from should be empty.
2381                 if ( $from != $current->getUserText() ) {
2382                         $resultDetails = array( 'current' => $current );
2383                         return array( array( 'alreadyrolled',
2384                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2385                                 htmlspecialchars( $fromP ),
2386                                 htmlspecialchars( $current->getUserText() )
2387                         ) );
2388                 }
2389
2390                 # Get the last edit not by this guy...
2391                 # Note: these may not be public values
2392                 $user = intval( $current->getRawUser() );
2393                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2394                 $s = $dbw->selectRow( 'revision',
2395                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2396                         array( 'rev_page' => $current->getPage(),
2397                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2398                         ), __METHOD__,
2399                         array( 'USE INDEX' => 'page_timestamp',
2400                                 'ORDER BY' => 'rev_timestamp DESC' )
2401                         );
2402                 if ( $s === false ) {
2403                         # No one else ever edited this page
2404                         return array( array( 'cantrollback' ) );
2405                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2406                         # Only admins can see this text
2407                         return array( array( 'notvisiblerev' ) );
2408                 }
2409
2410                 $set = array();
2411                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2412                         # Mark all reverted edits as bot
2413                         $set['rc_bot'] = 1;
2414                 }
2415
2416                 if ( $wgUseRCPatrol ) {
2417                         # Mark all reverted edits as patrolled
2418                         $set['rc_patrolled'] = 1;
2419                 }
2420
2421                 if ( count( $set ) ) {
2422                         $dbw->update( 'recentchanges', $set,
2423                                 array( /* WHERE */
2424                                         'rc_cur_id' => $current->getPage(),
2425                                         'rc_user_text' => $current->getUserText(),
2426                                         "rc_timestamp > '{$s->rev_timestamp}'",
2427                                 ), __METHOD__
2428                         );
2429                 }
2430
2431                 # Generate the edit summary if necessary
2432                 $target = Revision::newFromId( $s->rev_id );
2433                 if ( empty( $summary ) ) {
2434                         if ( $from == '' ) { // no public user name
2435                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2436                         } else {
2437                                 $summary = wfMsgForContent( 'revertpage' );
2438                         }
2439                 }
2440
2441                 # Allow the custom summary to use the same args as the default message
2442                 $args = array(
2443                         $target->getUserText(), $from, $s->rev_id,
2444                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2445                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2446                 );
2447                 $summary = wfMsgReplaceArgs( $summary, $args );
2448
2449                 # Save
2450                 $flags = EDIT_UPDATE;
2451
2452                 if ( $guser->isAllowed( 'minoredit' ) ) {
2453                         $flags |= EDIT_MINOR;
2454                 }
2455
2456                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2457                         $flags |= EDIT_FORCE_BOT;
2458                 }
2459
2460                 # Actually store the edit
2461                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2462                 if ( !empty( $status->value['revision'] ) ) {
2463                         $revId = $status->value['revision']->getId();
2464                 } else {
2465                         $revId = false;
2466                 }
2467
2468                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2469
2470                 $resultDetails = array(
2471                         'summary' => $summary,
2472                         'current' => $current,
2473                         'target'  => $target,
2474                         'newid'   => $revId
2475                 );
2476
2477                 return array();
2478         }
2479
2480         /**
2481          * The onArticle*() functions are supposed to be a kind of hooks
2482          * which should be called whenever any of the specified actions
2483          * are done.
2484          *
2485          * This is a good place to put code to clear caches, for instance.
2486          *
2487          * This is called on page move and undelete, as well as edit
2488          *
2489          * @param $title Title object
2490          */
2491         public static function onArticleCreate( $title ) {
2492                 # Update existence markers on article/talk tabs...
2493                 if ( $title->isTalkPage() ) {
2494                         $other = $title->getSubjectPage();
2495                 } else {
2496                         $other = $title->getTalkPage();
2497                 }
2498
2499                 $other->invalidateCache();
2500                 $other->purgeSquid();
2501
2502                 $title->touchLinks();
2503                 $title->purgeSquid();
2504                 $title->deleteTitleProtection();
2505         }
2506
2507         /**
2508          * Clears caches when article is deleted
2509          *
2510          * @param $title Title
2511          */
2512         public static function onArticleDelete( $title ) {
2513                 # Update existence markers on article/talk tabs...
2514                 if ( $title->isTalkPage() ) {
2515                         $other = $title->getSubjectPage();
2516                 } else {
2517                         $other = $title->getTalkPage();
2518                 }
2519
2520                 $other->invalidateCache();
2521                 $other->purgeSquid();
2522
2523                 $title->touchLinks();
2524                 $title->purgeSquid();
2525
2526                 # File cache
2527                 HTMLFileCache::clearFileCache( $title );
2528
2529                 # Messages
2530                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2531                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2532                 }
2533
2534                 # Images
2535                 if ( $title->getNamespace() == NS_FILE ) {
2536                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2537                         $update->doUpdate();
2538                 }
2539
2540                 # User talk pages
2541                 if ( $title->getNamespace() == NS_USER_TALK ) {
2542                         $user = User::newFromName( $title->getText(), false );
2543                         if ( $user ) {
2544                                 $user->setNewtalk( false );
2545                         }
2546                 }
2547
2548                 # Image redirects
2549                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2550         }
2551
2552         /**
2553          * Purge caches on page update etc
2554          *
2555          * @param $title Title object
2556          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2557          */
2558         public static function onArticleEdit( $title ) {
2559                 // Invalidate caches of articles which include this page
2560                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2561
2562
2563                 // Invalidate the caches of all pages which redirect here
2564                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2565
2566                 # Purge squid for this page only
2567                 $title->purgeSquid();
2568
2569                 # Clear file cache for this page only
2570                 HTMLFileCache::clearFileCache( $title );
2571         }
2572
2573         /**#@-*/
2574
2575         /**
2576          * Returns a list of hidden categories this page is a member of.
2577          * Uses the page_props and categorylinks tables.
2578          *
2579          * @return Array of Title objects
2580          */
2581         public function getHiddenCategories() {
2582                 $result = array();
2583                 $id = $this->mTitle->getArticleID();
2584
2585                 if ( $id == 0 ) {
2586                         return array();
2587                 }
2588
2589                 $dbr = wfGetDB( DB_SLAVE );
2590                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2591                         array( 'cl_to' ),
2592                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2593                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2594                         __METHOD__ );
2595
2596                 if ( $res !== false ) {
2597                         foreach ( $res as $row ) {
2598                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2599                         }
2600                 }
2601
2602                 return $result;
2603         }
2604
2605         /**
2606         * Return an applicable autosummary if one exists for the given edit.
2607         * @param $oldtext String: the previous text of the page.
2608         * @param $newtext String: The submitted text of the page.
2609         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2610         * @return string An appropriate autosummary, or an empty string.
2611     * @deprecated since 1.20, use ContentHandler::getAutosummary() instead
2612         */
2613         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2614                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2615
2616         $handler = ContentHandler::getForModelName( CONTENT_MODEL_WIKITEXT );
2617         $oldContent = $oldtext ? $handler->unserialize( $oldtext ) : null;
2618         $newContent = $newtext ? $handler->unserialize( $newtext ) : null;
2619
2620         return $handler->getAutosummary( $oldContent, $newContent, $flags );
2621         }
2622
2623         /**
2624          * Auto-generates a deletion reason
2625          *
2626          * @param &$hasHistory Boolean: whether the page has a history
2627          * @return mixed String containing deletion reason or empty string, or boolean false
2628          *    if no revision occurred
2629      * @deprecated since 1.20, use ContentHandler::getAutoDeleteReason() instead
2630          */
2631         public function getAutoDeleteReason( &$hasHistory ) {
2632         #NOTE: stub for backwards-compatibility.
2633
2634                 $handler = ContentHandler::getForTitle( $this->getTitle() );
2635         $handler->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2636                 global $wgContLang;
2637
2638                 // Get the last revision
2639                 $rev = $this->getRevision();
2640
2641                 if ( is_null( $rev ) ) {
2642                         return false;
2643                 }
2644
2645                 // Get the article's contents
2646                 $contents = $rev->getText();
2647                 $blank = false;
2648
2649                 // If the page is blank, use the text from the previous revision,
2650                 // which can only be blank if there's a move/import/protect dummy revision involved
2651                 if ( $contents == '' ) {
2652                         $prev = $rev->getPrevious();
2653
2654                         if ( $prev )    {
2655                                 $contents = $prev->getText();
2656                                 $blank = true;
2657                         }
2658                 }
2659
2660                 $dbw = wfGetDB( DB_MASTER );
2661
2662                 // Find out if there was only one contributor
2663                 // Only scan the last 20 revisions
2664                 $res = $dbw->select( 'revision', 'rev_user_text',
2665                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2666                         __METHOD__,
2667                         array( 'LIMIT' => 20 )
2668                 );
2669
2670                 if ( $res === false ) {
2671                         // This page has no revisions, which is very weird
2672                         return false;
2673                 }
2674
2675                 $hasHistory = ( $res->numRows() > 1 );
2676                 $row = $dbw->fetchObject( $res );
2677
2678                 if ( $row ) { // $row is false if the only contributor is hidden
2679                         $onlyAuthor = $row->rev_user_text;
2680                         // Try to find a second contributor
2681                         foreach ( $res as $row ) {
2682                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2683                                         $onlyAuthor = false;
2684                                         break;
2685                                 }
2686                         }
2687                 } else {
2688                         $onlyAuthor = false;
2689                 }
2690
2691                 // Generate the summary with a '$1' placeholder
2692                 if ( $blank ) {
2693                         // The current revision is blank and the one before is also
2694                         // blank. It's just not our lucky day
2695                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2696                 } else {
2697                         if ( $onlyAuthor ) {
2698                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2699                         } else {
2700                                 $reason = wfMsgForContent( 'excontent', '$1' );
2701                         }
2702                 }
2703
2704                 if ( $reason == '-' ) {
2705                         // Allow these UI messages to be blanked out cleanly
2706                         return '';
2707                 }
2708
2709                 // Replace newlines with spaces to prevent uglyness
2710                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2711                 // Calculate the maximum amount of chars to get
2712                 // Max content length = max comment length - length of the comment (excl. $1)
2713                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2714                 $contents = $wgContLang->truncate( $contents, $maxLength );
2715                 // Remove possible unfinished links
2716                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2717                 // Now replace the '$1' placeholder
2718                 $reason = str_replace( '$1', $contents, $reason );
2719
2720                 return $reason;
2721         }
2722
2723         /**
2724          * Update all the appropriate counts in the category table, given that
2725          * we've added the categories $added and deleted the categories $deleted.
2726          *
2727          * @param $added array   The names of categories that were added
2728          * @param $deleted array The names of categories that were deleted
2729          */
2730         public function updateCategoryCounts( $added, $deleted ) {
2731                 $ns = $this->mTitle->getNamespace();
2732                 $dbw = wfGetDB( DB_MASTER );
2733
2734                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2735                 # exist, we might legitimately not create it, but it's simpler to just
2736                 # create it and then give it a negative value, since the value is bogus
2737                 # anyway.
2738                 #
2739                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2740                 $insertCats = array_merge( $added, $deleted );
2741                 if ( !$insertCats ) {
2742                         # Okay, nothing to do
2743                         return;
2744                 }
2745
2746                 $insertRows = array();
2747
2748                 foreach ( $insertCats as $cat ) {
2749                         $insertRows[] = array(
2750                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2751                                 'cat_title' => $cat
2752                         );
2753                 }
2754                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2755
2756                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2757                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2758
2759                 if ( $ns == NS_CATEGORY ) {
2760                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2761                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2762                 } elseif ( $ns == NS_FILE ) {
2763                         $addFields[]    = 'cat_files = cat_files + 1';
2764                         $removeFields[] = 'cat_files = cat_files - 1';
2765                 }
2766
2767                 if ( $added ) {
2768                         $dbw->update(
2769                                 'category',
2770                                 $addFields,
2771                                 array( 'cat_title' => $added ),
2772                                 __METHOD__
2773                         );
2774                 }
2775
2776                 if ( $deleted ) {
2777                         $dbw->update(
2778                                 'category',
2779                                 $removeFields,
2780                                 array( 'cat_title' => $deleted ),
2781                                 __METHOD__
2782                         );
2783                 }
2784         }
2785
2786         /**
2787          * Updates cascading protections
2788          *
2789          * @param $parserOutput ParserOutput object for the current version
2790          */
2791         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2792                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2793                         return;
2794                 }
2795
2796                 // templatelinks table may have become out of sync,
2797                 // especially if using variable-based transclusions.
2798                 // For paranoia, check if things have changed and if
2799                 // so apply updates to the database. This will ensure
2800                 // that cascaded protections apply as soon as the changes
2801                 // are visible.
2802
2803                 # Get templates from templatelinks
2804                 $id = $this->mTitle->getArticleID();
2805
2806                 $tlTemplates = array();
2807
2808                 $dbr = wfGetDB( DB_SLAVE );
2809                 $res = $dbr->select( array( 'templatelinks' ),
2810                         array( 'tl_namespace', 'tl_title' ),
2811                         array( 'tl_from' => $id ),
2812                         __METHOD__
2813                 );
2814
2815                 foreach ( $res as $row ) {
2816                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2817                 }
2818
2819                 # Get templates from parser output.
2820                 $poTemplates = array();
2821                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2822                         foreach ( $templates as $dbk => $id ) {
2823                                 $poTemplates["$ns:$dbk"] = true;
2824                         }
2825                 }
2826
2827                 # Get the diff
2828                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2829
2830                 if ( count( $templates_diff ) > 0 ) {
2831                         # Whee, link updates time.
2832             # Note: we are only interested in links here. We don't need to get other SecondaryDataUpdate items from the parser output.
2833                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2834                         $u->doUpdate();
2835                 }
2836         }
2837
2838         /**
2839          * Return a list of templates used by this article.
2840          * Uses the templatelinks table
2841          *
2842          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2843          * @return Array of Title objects
2844          */
2845         public function getUsedTemplates() {
2846                 return $this->mTitle->getTemplateLinksFrom();
2847         }
2848
2849         /**
2850          * Perform article updates on a special page creation.
2851          *
2852          * @param $rev Revision object
2853          *
2854          * @todo This is a shitty interface function. Kill it and replace the
2855          * other shitty functions like doEditUpdates and such so it's not needed
2856          * anymore.
2857          * @deprecated since 1.18, use doEditUpdates()
2858          */
2859         public function createUpdates( $rev ) {
2860                 wfDeprecated( __METHOD__, '1.18' );
2861                 global $wgUser;
2862                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2863         }
2864
2865         /**
2866          * This function is called right before saving the wikitext,
2867          * so we can do things like signatures and links-in-context.
2868          *
2869          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2870          * @param $text String article contents
2871          * @param $user User object: user doing the edit
2872          * @param $popts ParserOptions object: parser options, default options for
2873          *               the user loaded if null given
2874          * @return string article contents with altered wikitext markup (signatures
2875          *      converted, {{subst:}}, templates, etc.)
2876          */
2877         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2878                 global $wgParser, $wgUser;
2879
2880                 wfDeprecated( __METHOD__, '1.19' );
2881
2882                 $user = is_null( $user ) ? $wgUser : $user;
2883
2884                 if ( $popts === null ) {
2885                         $popts = ParserOptions::newFromUser( $user );
2886                 }
2887
2888                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2889         }
2890
2891         /**
2892          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2893          *
2894          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2895          * @return bool
2896          */
2897         public function isBigDeletion() {
2898                 wfDeprecated( __METHOD__, '1.19' );
2899                 return $this->mTitle->isBigDeletion();
2900         }
2901
2902         /**
2903          * Get the  approximate revision count of this page.
2904          *
2905          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2906          * @return int
2907          */
2908         public function estimateRevisionCount() {
2909                 wfDeprecated( __METHOD__, '1.19' );
2910                 return $this->mTitle->estimateRevisionCount();
2911         }
2912
2913         /**
2914          * Update the article's restriction field, and leave a log entry.
2915          *
2916          * @deprecated since 1.19
2917          * @param $limit Array: set of restriction keys
2918          * @param $reason String
2919          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2920          * @param $expiry Array: per restriction type expiration
2921          * @param $user User The user updating the restrictions
2922          * @return bool true on success
2923          */
2924         public function updateRestrictions(
2925                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2926         ) {
2927                 global $wgUser;
2928
2929                 $user = is_null( $user ) ? $wgUser : $user;
2930
2931                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2932         }
2933
2934         /**
2935          * @deprecated since 1.18
2936          */
2937         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2938                 wfDeprecated( __METHOD__, '1.18' );
2939                 global $wgUser;
2940                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2941         }
2942
2943         /**
2944          * @deprecated since 1.18
2945          */
2946         public function viewUpdates() {
2947                 wfDeprecated( __METHOD__, '1.18' );
2948                 global $wgUser;
2949                 return $this->doViewUpdates( $wgUser );
2950         }
2951
2952         /**
2953          * @deprecated since 1.18
2954          * @return bool
2955          */
2956         public function useParserCache( $oldid ) {
2957                 wfDeprecated( __METHOD__, '1.18' );
2958                 global $wgUser;
2959                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2960         }
2961 }
2962
2963 class PoolWorkArticleView extends PoolCounterWork {
2964
2965         /**
2966          * @var Page
2967          */
2968         private $page;
2969
2970         /**
2971          * @var string
2972          */
2973         private $cacheKey;
2974
2975         /**
2976          * @var integer
2977          */
2978         private $revid;
2979
2980         /**
2981          * @var ParserOptions
2982          */
2983         private $parserOptions;
2984
2985         /**
2986          * @var string|null
2987          */
2988         private $text;
2989
2990         /**
2991          * @var ParserOutput|bool
2992          */
2993         private $parserOutput = false;
2994
2995         /**
2996          * @var bool
2997          */
2998         private $isDirty = false;
2999
3000         /**
3001          * @var Status|bool
3002          */
3003         private $error = false;
3004
3005         /**
3006          * Constructor
3007          *
3008          * @param $page Page
3009          * @param $revid Integer: ID of the revision being parsed
3010          * @param $useParserCache Boolean: whether to use the parser cache
3011          * @param $parserOptions parserOptions to use for the parse operation
3012          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3013          */
3014         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3015         if ( is_string($content) ) { #BC: old style call
3016             $modelName = $page->getRevision()->getContentModelName();
3017             $format = $page->getRevision()->getContentFormat();
3018             $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelName, $format );
3019         }
3020
3021                 $this->page = $page;
3022                 $this->revid = $revid;
3023                 $this->cacheable = $useParserCache;
3024                 $this->parserOptions = $parserOptions;
3025                 $this->content = $content;
3026                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3027                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3028         }
3029
3030         /**
3031          * Get the ParserOutput from this object, or false in case of failure
3032          *
3033          * @return ParserOutput
3034          */
3035         public function getParserOutput() {
3036                 return $this->parserOutput;
3037         }
3038
3039         /**
3040          * Get whether the ParserOutput is a dirty one (i.e. expired)
3041          *
3042          * @return bool
3043          */
3044         public function getIsDirty() {
3045                 return $this->isDirty;
3046         }
3047
3048         /**
3049          * Get a Status object in case of error or false otherwise
3050          *
3051          * @return Status|bool
3052          */
3053         public function getError() {
3054                 return $this->error;
3055         }
3056
3057         /**
3058          * @return bool
3059          */
3060         function doWork() {
3061                 global $wgParser, $wgUseFileCache;
3062
3063                 $isCurrent = $this->revid === $this->page->getLatest();
3064
3065                 if ( $this->content !== null ) {
3066                         $content = $this->content;
3067                 } elseif ( $isCurrent ) {
3068             $content = $this->page->getContent( Revision::RAW ); #XXX: why use RAW audience here, and PUBLIC (default) below?
3069                 } else {
3070                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3071                         if ( $rev === null ) {
3072                                 return false;
3073                         }
3074             $content = $rev->getContent(); #XXX: why use PUBLIC audience here (default), and RAW above?
3075                 }
3076
3077                 $time = - wfTime();
3078                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3079                 $time += wfTime();
3080                 $time = - microtime( true );
3081                 $this->parserOutput = $wgParser->parse( $text, $this->page->getTitle(),
3082                         $this->parserOptions, true, true, $this->revid );
3083                 $time += microtime( true );
3084
3085                 # Timing hack
3086                 if ( $time > 3 ) {
3087                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3088                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3089                 }
3090
3091                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3092                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3093                 }
3094
3095                 // Make sure file cache is not used on uncacheable content.
3096                 // Output that has magic words in it can still use the parser cache
3097                 // (if enabled), though it will generally expire sooner.
3098                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3099                         $wgUseFileCache = false;
3100                 }
3101
3102                 if ( $isCurrent ) {
3103                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3104                 }
3105
3106                 return true;
3107         }
3108
3109         /**
3110          * @return bool
3111          */
3112         function getCachedWork() {
3113                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3114
3115                 if ( $this->parserOutput === false ) {
3116                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3117                         return false;
3118                 } else {
3119                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3120                         return true;
3121                 }
3122         }
3123
3124         /**
3125          * @return bool
3126          */
3127         function fallback() {
3128                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3129
3130                 if ( $this->parserOutput === false ) {
3131                         wfDebugLog( 'dirty', "dirty missing\n" );
3132                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3133                         return false;
3134                 } else {
3135                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3136                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3137                         $this->isDirty = true;
3138                         return true;
3139                 }
3140         }
3141
3142         /**
3143          * @param $status Status
3144          * @return bool
3145          */
3146         function error( $status ) {
3147                 $this->error = $status;
3148                 return false;
3149         }
3150 }