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