includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
  25  */
  26 interface Page {
  27 }
  28
  29 /**
  30  * Class representing a MediaWiki article and history.
  31  *
  32  * Some fields are public only for backwards-compatibility. Use accessors.
  33  * In the past, this class was part of Article.php and everything was public.
  34  *
  35  * @internal documentation reviewed 15 Mar 2010
  36  */
  37 class WikiPage implements Page, IDBAccessObject {
  38         // Constants for $mDataLoadedFrom and related
  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         /**@}}*/
  52
  53         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  54         public $mPreparedEdit = false;
  55
  56         /**
  57          * @var int
  58          */
  59         protected $mId = null;
  60
  61         /**
  62          * @var int One of the READ_* constants
  63          */
  64         protected $mDataLoadedFrom = self::READ_NONE;
  65
  66         /**
  67          * @var Title
  68          */
  69         protected $mRedirectTarget = null;
  70
  71         /**
  72          * @var Revision
  73          */
  74         protected $mLastRevision = null;
  75
  76         /**
  77          * @var string Timestamp of the current revision or empty string if not loaded
  78          */
  79         protected $mTimestamp = '';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mTouched = '19700101000000';
  85
  86         /**
  87          * @var string
  88          */
  89         protected $mLinksUpdated = '19700101000000';
  90
  91         /**
  92          * Constructor and clear the article
  93          * @param Title $title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Create a WikiPage object of the appropriate class for the given title.
 101          *
 102          * @param Title $title
 103          *
 104          * @throws MWException
 105          * @return WikiPage Object of the appropriate type
 106          */
 107         public static function factory( Title $title ) {
 108                 $ns = $title->getNamespace();
 109
 110                 if ( $ns == NS_MEDIA ) {
 111                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 112                 } elseif ( $ns < 0 ) {
 113                         throw new MWException( "Invalid or virtual namespace $ns given." );
 114                 }
 115
 116                 switch ( $ns ) {
 117                         case NS_FILE:
 118                                 $page = new WikiFilePage( $title );
 119                                 break;
 120                         case NS_CATEGORY:
 121                                 $page = new WikiCategoryPage( $title );
 122                                 break;
 123                         default:
 124                                 $page = new WikiPage( $title );
 125                 }
 126
 127                 return $page;
 128         }
 129
 130         /**
 131          * Constructor from a page id
 132          *
 133          * @param int $id Article ID to load
 134          * @param string|int $from One of the following values:
 135          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 136          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 137          *
 138          * @return WikiPage|null
 139          */
 140         public static function newFromID( $id, $from = 'fromdb' ) {
 141                 // page id's are never 0 or negative, see bug 61166
 142                 if ( $id < 1 ) {
 143                         return null;
 144                 }
 145
 146                 $from = self::convertSelectType( $from );
 147                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 148                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 149                 if ( !$row ) {
 150                         return null;
 151                 }
 152                 return self::newFromRow( $row, $from );
 153         }
 154
 155         /**
 156          * Constructor from a database row
 157          *
 158          * @since 1.20
 159          * @param object $row Database row containing at least fields returned by selectFields().
 160          * @param string|int $from Source of $data:
 161          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 162          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 163          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 164          * @return WikiPage
 165          */
 166         public static function newFromRow( $row, $from = 'fromdb' ) {
 167                 $page = self::factory( Title::newFromRow( $row ) );
 168                 $page->loadFromRow( $row, $from );
 169                 return $page;
 170         }
 171
 172         /**
 173          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 174          *
 175          * @param object|string|int $type
 176          * @return mixed
 177          */
 178         private static function convertSelectType( $type ) {
 179                 switch ( $type ) {
 180                 case 'fromdb':
 181                         return self::READ_NORMAL;
 182                 case 'fromdbmaster':
 183                         return self::READ_LATEST;
 184                 case 'forupdate':
 185                         return self::READ_LOCKING;
 186                 default:
 187                         // It may already be an integer or whatever else
 188                         return $type;
 189                 }
 190         }
 191
 192         /**
 193          * Returns overrides for action handlers.
 194          * Classes listed here will be used instead of the default one when
 195          * (and only when) $wgActions[$action] === true. This allows subclasses
 196          * to override the default behavior.
 197          *
 198          * @todo Move this UI stuff somewhere else
 199          *
 200          * @return array
 201          */
 202         public function getActionOverrides() {
 203                 $content_handler = $this->getContentHandler();
 204                 return $content_handler->getActionOverrides();
 205         }
 206
 207         /**
 208          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 209          *
 210          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 211          *
 212          * @return ContentHandler
 213          *
 214          * @since 1.21
 215          */
 216         public function getContentHandler() {
 217                 return ContentHandler::getForModelID( $this->getContentModel() );
 218         }
 219
 220         /**
 221          * Get the title object of the article
 222          * @return Title Title object of this page
 223          */
 224         public function getTitle() {
 225                 return $this->mTitle;
 226         }
 227
 228         /**
 229          * Clear the object
 230          * @return void
 231          */
 232         public function clear() {
 233                 $this->mDataLoaded = false;
 234                 $this->mDataLoadedFrom = self::READ_NONE;
 235
 236                 $this->clearCacheFields();
 237         }
 238
 239         /**
 240          * Clear the object cache fields
 241          * @return void
 242          */
 243         protected function clearCacheFields() {
 244                 $this->mId = null;
 245                 $this->mRedirectTarget = null; // Title object if set
 246                 $this->mLastRevision = null; // Latest revision
 247                 $this->mTouched = '19700101000000';
 248                 $this->mLinksUpdated = '19700101000000';
 249                 $this->mTimestamp = '';
 250                 $this->mIsRedirect = false;
 251                 $this->mLatest = false;
 252                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 253                 // the requested rev ID and content against the cached one for equality. For most
 254                 // content types, the output should not change during the lifetime of this cache.
 255                 // Clearing it can cause extra parses on edit for no reason.
 256         }
 257
 258         /**
 259          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 260          * @return void
 261          * @since 1.23
 262          */
 263         public function clearPreparedEdit() {
 264                 $this->mPreparedEdit = false;
 265         }
 266
 267         /**
 268          * Return the list of revision fields that should be selected to create
 269          * a new page.
 270          *
 271          * @return array
 272          */
 273         public static function selectFields() {
 274                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 275
 276                 $fields = array(
 277                         'page_id',
 278                         'page_namespace',
 279                         'page_title',
 280                         'page_restrictions',
 281                         'page_is_redirect',
 282                         'page_is_new',
 283                         'page_random',
 284                         'page_touched',
 285                         'page_links_updated',
 286                         'page_latest',
 287                         'page_len',
 288                 );
 289
 290                 if ( $wgContentHandlerUseDB ) {
 291                         $fields[] = 'page_content_model';
 292                 }
 293
 294                 if ( $wgPageLanguageUseDB ) {
 295                         $fields[] = 'page_lang';
 296                 }
 297
 298                 return $fields;
 299         }
 300
 301         /**
 302          * Fetch a page record with the given conditions
 303          * @param DatabaseBase $dbr
 304          * @param array $conditions
 305          * @param array $options
 306          * @return object|bool Database result resource, or false on failure
 307          */
 308         protected function pageData( $dbr, $conditions, $options = array() ) {
 309                 $fields = self::selectFields();
 310
 311                 Hooks::run( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 312
 313                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 314
 315                 Hooks::run( 'ArticlePageDataAfter', array( &$this, &$row ) );
 316
 317                 return $row;
 318         }
 319
 320         /**
 321          * Fetch a page record matching the Title object's namespace and title
 322          * using a sanitized title string
 323          *
 324          * @param DatabaseBase $dbr
 325          * @param Title $title
 326          * @param array $options
 327          * @return object|bool Database result resource, or false on failure
 328          */
 329         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 330                 return $this->pageData( $dbr, array(
 331                         'page_namespace' => $title->getNamespace(),
 332                         'page_title' => $title->getDBkey() ), $options );
 333         }
 334
 335         /**
 336          * Fetch a page record matching the requested ID
 337          *
 338          * @param DatabaseBase $dbr
 339          * @param int $id
 340          * @param array $options
 341          * @return object|bool Database result resource, or false on failure
 342          */
 343         public function pageDataFromId( $dbr, $id, $options = array() ) {
 344                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 345         }
 346
 347         /**
 348          * Load the object from a given source by title
 349          *
 350          * @param object|string|int $from One of the following:
 351          *   - A DB query result object.
 352          *   - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB.
 353          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 354          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 355          *     using SELECT FOR UPDATE.
 356          *
 357          * @return void
 358          */
 359         public function loadPageData( $from = 'fromdb' ) {
 360                 $from = self::convertSelectType( $from );
 361                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 362                         // We already have the data from the correct location, no need to load it twice.
 363                         return;
 364                 }
 365
 366                 if ( $from === self::READ_LOCKING ) {
 367                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 368                 } elseif ( $from === self::READ_LATEST ) {
 369                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 370                 } elseif ( $from === self::READ_NORMAL ) {
 371                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 372                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 373                         // Note that DB also stores the master position in the session and checks it.
 374                         $touched = $this->getCachedLastEditTime();
 375                         if ( $touched ) { // key set
 376                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 377                                         $from = self::READ_LATEST;
 378                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 379                                 }
 380                         }
 381                 } else {
 382                         // No idea from where the caller got this data, assume slave database.
 383                         $data = $from;
 384                         $from = self::READ_NORMAL;
 385                 }
 386
 387                 $this->loadFromRow( $data, $from );
 388         }
 389
 390         /**
 391          * Load the object from a database row
 392          *
 393          * @since 1.20
 394          * @param object $data Database row containing at least fields returned by selectFields()
 395          * @param string|int $from One of the following:
 396          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 397          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 398          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 399          *          the master DB using SELECT FOR UPDATE
 400          */
 401         public function loadFromRow( $data, $from ) {
 402                 $lc = LinkCache::singleton();
 403                 $lc->clearLink( $this->mTitle );
 404
 405                 if ( $data ) {
 406                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 407
 408                         $this->mTitle->loadFromRow( $data );
 409
 410                         // Old-fashioned restrictions
 411                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 412
 413                         $this->mId = intval( $data->page_id );
 414                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 416                         $this->mIsRedirect = intval( $data->page_is_redirect );
 417                         $this->mLatest = intval( $data->page_latest );
 418                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 419                         // Double-check the ID of any cached latest Revision object for consistency.
 420                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 421                                 $this->mLastRevision = null;
 422                                 $this->mTimestamp = '';
 423                         }
 424                 } else {
 425                         $lc->addBadLinkObj( $this->mTitle );
 426
 427                         $this->mTitle->loadFromRow( false );
 428
 429                         $this->clearCacheFields();
 430
 431                         $this->mId = 0;
 432                 }
 433
 434                 $this->mDataLoaded = true;
 435                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 436         }
 437
 438         /**
 439          * @return int Page ID
 440          */
 441         public function getId() {
 442                 if ( !$this->mDataLoaded ) {
 443                         $this->loadPageData();
 444                 }
 445                 return $this->mId;
 446         }
 447
 448         /**
 449          * @return bool Whether or not the page exists in the database
 450          */
 451         public function exists() {
 452                 if ( !$this->mDataLoaded ) {
 453                         $this->loadPageData();
 454                 }
 455                 return $this->mId > 0;
 456         }
 457
 458         /**
 459          * Check if this page is something we're going to be showing
 460          * some sort of sensible content for. If we return false, page
 461          * views (plain action=view) will return an HTTP 404 response,
 462          * so spiders and robots can know they're following a bad link.
 463          *
 464          * @return bool
 465          */
 466         public function hasViewableContent() {
 467                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 468         }
 469
 470         /**
 471          * Tests if the article content represents a redirect
 472          *
 473          * @return bool
 474          */
 475         public function isRedirect() {
 476                 $content = $this->getContent();
 477                 if ( !$content ) {
 478                         return false;
 479                 }
 480
 481                 return $content->isRedirect();
 482         }
 483
 484         /**
 485          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 486          *
 487          * Will use the revisions actual content model if the page exists,
 488          * and the page's default if the page doesn't exist yet.
 489          *
 490          * @return string
 491          *
 492          * @since 1.21
 493          */
 494         public function getContentModel() {
 495                 if ( $this->exists() ) {
 496                         // look at the revision's actual content model
 497                         $rev = $this->getRevision();
 498
 499                         if ( $rev !== null ) {
 500                                 return $rev->getContentModel();
 501                         } else {
 502                                 $title = $this->mTitle->getPrefixedDBkey();
 503                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 504                         }
 505                 }
 506
 507                 // use the default model for this page
 508                 return $this->mTitle->getContentModel();
 509         }
 510
 511         /**
 512          * Loads page_touched and returns a value indicating if it should be used
 513          * @return bool True if not a redirect
 514          */
 515         public function checkTouched() {
 516                 if ( !$this->mDataLoaded ) {
 517                         $this->loadPageData();
 518                 }
 519                 return !$this->mIsRedirect;
 520         }
 521
 522         /**
 523          * Get the page_touched field
 524          * @return string Containing GMT timestamp
 525          */
 526         public function getTouched() {
 527                 if ( !$this->mDataLoaded ) {
 528                         $this->loadPageData();
 529                 }
 530                 return $this->mTouched;
 531         }
 532
 533         /**
 534          * Get the page_links_updated field
 535          * @return string|null Containing GMT timestamp
 536          */
 537         public function getLinksTimestamp() {
 538                 if ( !$this->mDataLoaded ) {
 539                         $this->loadPageData();
 540                 }
 541                 return $this->mLinksUpdated;
 542         }
 543
 544         /**
 545          * Get the page_latest field
 546          * @return int The rev_id of current revision
 547          */
 548         public function getLatest() {
 549                 if ( !$this->mDataLoaded ) {
 550                         $this->loadPageData();
 551                 }
 552                 return (int)$this->mLatest;
 553         }
 554
 555         /**
 556          * Get the Revision object of the oldest revision
 557          * @return Revision|null
 558          */
 559         public function getOldestRevision() {
 560
 561                 // Try using the slave database first, then try the master
 562                 $continue = 2;
 563                 $db = wfGetDB( DB_SLAVE );
 564                 $revSelectFields = Revision::selectFields();
 565
 566                 $row = null;
 567                 while ( $continue ) {
 568                         $row = $db->selectRow(
 569                                 array( 'page', 'revision' ),
 570                                 $revSelectFields,
 571                                 array(
 572                                         'page_namespace' => $this->mTitle->getNamespace(),
 573                                         'page_title' => $this->mTitle->getDBkey(),
 574                                         'rev_page = page_id'
 575                                 ),
 576                                 __METHOD__,
 577                                 array(
 578                                         'ORDER BY' => 'rev_timestamp ASC'
 579                                 )
 580                         );
 581
 582                         if ( $row ) {
 583                                 $continue = 0;
 584                         } else {
 585                                 $db = wfGetDB( DB_MASTER );
 586                                 $continue--;
 587                         }
 588                 }
 589
 590                 return $row ? Revision::newFromRow( $row ) : null;
 591         }
 592
 593         /**
 594          * Loads everything except the text
 595          * This isn't necessary for all uses, so it's only done if needed.
 596          */
 597         protected function loadLastEdit() {
 598                 if ( $this->mLastRevision !== null ) {
 599                         return; // already loaded
 600                 }
 601
 602                 $latest = $this->getLatest();
 603                 if ( !$latest ) {
 604                         return; // page doesn't exist or is missing page_latest info
 605                 }
 606
 607                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 608                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 609                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 610                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 611                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 612                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 613                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 614                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 615                 if ( $revision ) { // sanity
 616                         $this->setLastEdit( $revision );
 617                 }
 618         }
 619
 620         /**
 621          * Set the latest revision
 622          * @param Revision $revision
 623          */
 624         protected function setLastEdit( Revision $revision ) {
 625                 $this->mLastRevision = $revision;
 626                 $this->mTimestamp = $revision->getTimestamp();
 627         }
 628
 629         /**
 630          * Get the latest revision
 631          * @return Revision|null
 632          */
 633         public function getRevision() {
 634                 $this->loadLastEdit();
 635                 if ( $this->mLastRevision ) {
 636                         return $this->mLastRevision;
 637                 }
 638                 return null;
 639         }
 640
 641         /**
 642          * Get the content of the current revision. No side-effects...
 643          *
 644          * @param int $audience One of:
 645          *   Revision::FOR_PUBLIC       to be displayed to all users
 646          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 647          *   Revision::RAW              get the text regardless of permissions
 648          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 649          *   to the $audience parameter
 650          * @return Content|null The content of the current revision
 651          *
 652          * @since 1.21
 653          */
 654         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 655                 $this->loadLastEdit();
 656                 if ( $this->mLastRevision ) {
 657                         return $this->mLastRevision->getContent( $audience, $user );
 658                 }
 659                 return null;
 660         }
 661
 662         /**
 663          * Get the text of the current revision. No side-effects...
 664          *
 665          * @param int $audience One of:
 666          *   Revision::FOR_PUBLIC       to be displayed to all users
 667          *   Revision::FOR_THIS_USER    to be displayed to the given user
 668          *   Revision::RAW              get the text regardless of permissions
 669          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 670          *   to the $audience parameter
 671          * @return string|bool The text of the current revision
 672          * @deprecated since 1.21, getContent() should be used instead.
 673          */
 674         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 675                 ContentHandler::deprecated( __METHOD__, '1.21' );
 676
 677                 $this->loadLastEdit();
 678                 if ( $this->mLastRevision ) {
 679                         return $this->mLastRevision->getText( $audience, $user );
 680                 }
 681                 return false;
 682         }
 683
 684         /**
 685          * Get the text of the current revision. No side-effects...
 686          *
 687          * @return string|bool The text of the current revision. False on failure
 688          * @deprecated since 1.21, getContent() should be used instead.
 689          */
 690         public function getRawText() {
 691                 ContentHandler::deprecated( __METHOD__, '1.21' );
 692
 693                 return $this->getText( Revision::RAW );
 694         }
 695
 696         /**
 697          * @return string MW timestamp of last article revision
 698          */
 699         public function getTimestamp() {
 700                 // Check if the field has been filled by WikiPage::setTimestamp()
 701                 if ( !$this->mTimestamp ) {
 702                         $this->loadLastEdit();
 703                 }
 704
 705                 return wfTimestamp( TS_MW, $this->mTimestamp );
 706         }
 707
 708         /**
 709          * Set the page timestamp (use only to avoid DB queries)
 710          * @param string $ts MW timestamp of last article revision
 711          * @return void
 712          */
 713         public function setTimestamp( $ts ) {
 714                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 715         }
 716
 717         /**
 718          * @param int $audience One of:
 719          *   Revision::FOR_PUBLIC       to be displayed to all users
 720          *   Revision::FOR_THIS_USER    to be displayed to the given user
 721          *   Revision::RAW              get the text regardless of permissions
 722          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 723          *   to the $audience parameter
 724          * @return int User ID for the user that made the last article revision
 725          */
 726         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 727                 $this->loadLastEdit();
 728                 if ( $this->mLastRevision ) {
 729                         return $this->mLastRevision->getUser( $audience, $user );
 730                 } else {
 731                         return -1;
 732                 }
 733         }
 734
 735         /**
 736          * Get the User object of the user who created the page
 737          * @param int $audience One of:
 738          *   Revision::FOR_PUBLIC       to be displayed to all users
 739          *   Revision::FOR_THIS_USER    to be displayed to the given user
 740          *   Revision::RAW              get the text regardless of permissions
 741          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 742          *   to the $audience parameter
 743          * @return User|null
 744          */
 745         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 746                 $revision = $this->getOldestRevision();
 747                 if ( $revision ) {
 748                         $userName = $revision->getUserText( $audience, $user );
 749                         return User::newFromName( $userName, false );
 750                 } else {
 751                         return null;
 752                 }
 753         }
 754
 755         /**
 756          * @param int $audience One of:
 757          *   Revision::FOR_PUBLIC       to be displayed to all users
 758          *   Revision::FOR_THIS_USER    to be displayed to the given user
 759          *   Revision::RAW              get the text regardless of permissions
 760          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 761          *   to the $audience parameter
 762          * @return string Username of the user that made the last article revision
 763          */
 764         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 765                 $this->loadLastEdit();
 766                 if ( $this->mLastRevision ) {
 767                         return $this->mLastRevision->getUserText( $audience, $user );
 768                 } else {
 769                         return '';
 770                 }
 771         }
 772
 773         /**
 774          * @param int $audience One of:
 775          *   Revision::FOR_PUBLIC       to be displayed to all users
 776          *   Revision::FOR_THIS_USER    to be displayed to the given user
 777          *   Revision::RAW              get the text regardless of permissions
 778          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 779          *   to the $audience parameter
 780          * @return string Comment stored for the last article revision
 781          */
 782         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 783                 $this->loadLastEdit();
 784                 if ( $this->mLastRevision ) {
 785                         return $this->mLastRevision->getComment( $audience, $user );
 786                 } else {
 787                         return '';
 788                 }
 789         }
 790
 791         /**
 792          * Returns true if last revision was marked as "minor edit"
 793          *
 794          * @return bool Minor edit indicator for the last article revision.
 795          */
 796         public function getMinorEdit() {
 797                 $this->loadLastEdit();
 798                 if ( $this->mLastRevision ) {
 799                         return $this->mLastRevision->isMinor();
 800                 } else {
 801                         return false;
 802                 }
 803         }
 804
 805         /**
 806          * Get the cached timestamp for the last time the page changed.
 807          * This is only used to help handle slave lag by comparing to page_touched.
 808          * @return string MW timestamp
 809          */
 810         protected function getCachedLastEditTime() {
 811                 global $wgMemc;
 812                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 813                 return $wgMemc->get( $key );
 814         }
 815
 816         /**
 817          * Set the cached timestamp for the last time the page changed.
 818          * This is only used to help handle slave lag by comparing to page_touched.
 819          * @param string $timestamp
 820          * @return void
 821          */
 822         public function setCachedLastEditTime( $timestamp ) {
 823                 global $wgMemc;
 824                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 825                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 826         }
 827
 828         /**
 829          * Determine whether a page would be suitable for being counted as an
 830          * article in the site_stats table based on the title & its content
 831          *
 832          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 833          *   if false, the current database state will be used
 834          * @return bool
 835          */
 836         public function isCountable( $editInfo = false ) {
 837                 global $wgArticleCountMethod;
 838
 839                 if ( !$this->mTitle->isContentPage() ) {
 840                         return false;
 841                 }
 842
 843                 if ( $editInfo ) {
 844                         $content = $editInfo->pstContent;
 845                 } else {
 846                         $content = $this->getContent();
 847                 }
 848
 849                 if ( !$content || $content->isRedirect() ) {
 850                         return false;
 851                 }
 852
 853                 $hasLinks = null;
 854
 855                 if ( $wgArticleCountMethod === 'link' ) {
 856                         // nasty special case to avoid re-parsing to detect links
 857
 858                         if ( $editInfo ) {
 859                                 // ParserOutput::getLinks() is a 2D array of page links, so
 860                                 // to be really correct we would need to recurse in the array
 861                                 // but the main array should only have items in it if there are
 862                                 // links.
 863                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 864                         } else {
 865                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 866                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 867                         }
 868                 }
 869
 870                 return $content->isCountable( $hasLinks );
 871         }
 872
 873         /**
 874          * If this page is a redirect, get its target
 875          *
 876          * The target will be fetched from the redirect table if possible.
 877          * If this page doesn't have an entry there, call insertRedirect()
 878          * @return Title|null Title object, or null if this page is not a redirect
 879          */
 880         public function getRedirectTarget() {
 881                 if ( !$this->mTitle->isRedirect() ) {
 882                         return null;
 883                 }
 884
 885                 if ( $this->mRedirectTarget !== null ) {
 886                         return $this->mRedirectTarget;
 887                 }
 888
 889                 // Query the redirect table
 890                 $dbr = wfGetDB( DB_SLAVE );
 891                 $row = $dbr->selectRow( 'redirect',
 892                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 893                         array( 'rd_from' => $this->getId() ),
 894                         __METHOD__
 895                 );
 896
 897                 // rd_fragment and rd_interwiki were added later, populate them if empty
 898                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 899                         $this->mRedirectTarget = Title::makeTitle(
 900                                 $row->rd_namespace, $row->rd_title,
 901                                 $row->rd_fragment, $row->rd_interwiki );
 902                         return $this->mRedirectTarget;
 903                 }
 904
 905                 // This page doesn't have an entry in the redirect table
 906                 $this->mRedirectTarget = $this->insertRedirect();
 907                 return $this->mRedirectTarget;
 908         }
 909
 910         /**
 911          * Insert an entry for this page into the redirect table.
 912          *
 913          * Don't call this function directly unless you know what you're doing.
 914          * @return Title|null Title object or null if not a redirect
 915          */
 916         public function insertRedirect() {
 917                 // recurse through to only get the final target
 918                 $content = $this->getContent();
 919                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 920                 if ( !$retval ) {
 921                         return null;
 922                 }
 923                 $this->insertRedirectEntry( $retval );
 924                 return $retval;
 925         }
 926
 927         /**
 928          * Insert or update the redirect table entry for this page to indicate
 929          * it redirects to $rt .
 930          * @param Title $rt Redirect target
 931          */
 932         public function insertRedirectEntry( $rt ) {
 933                 $dbw = wfGetDB( DB_MASTER );
 934                 $dbw->replace( 'redirect', array( 'rd_from' ),
 935                         array(
 936                                 'rd_from' => $this->getId(),
 937                                 'rd_namespace' => $rt->getNamespace(),
 938                                 'rd_title' => $rt->getDBkey(),
 939                                 'rd_fragment' => $rt->getFragment(),
 940                                 'rd_interwiki' => $rt->getInterwiki(),
 941                         ),
 942                         __METHOD__
 943                 );
 944         }
 945
 946         /**
 947          * Get the Title object or URL this page redirects to
 948          *
 949          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 950          */
 951         public function followRedirect() {
 952                 return $this->getRedirectURL( $this->getRedirectTarget() );
 953         }
 954
 955         /**
 956          * Get the Title object or URL to use for a redirect. We use Title
 957          * objects for same-wiki, non-special redirects and URLs for everything
 958          * else.
 959          * @param Title $rt Redirect target
 960          * @return bool|Title|string False, Title object of local target, or string with URL
 961          */
 962         public function getRedirectURL( $rt ) {
 963                 if ( !$rt ) {
 964                         return false;
 965                 }
 966
 967                 if ( $rt->isExternal() ) {
 968                         if ( $rt->isLocal() ) {
 969                                 // Offsite wikis need an HTTP redirect.
 970                                 //
 971                                 // This can be hard to reverse and may produce loops,
 972                                 // so they may be disabled in the site configuration.
 973                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 974                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 975                         } else {
 976                                 // External pages without "local" bit set are not valid
 977                                 // redirect targets
 978                                 return false;
 979                         }
 980                 }
 981
 982                 if ( $rt->isSpecialPage() ) {
 983                         // Gotta handle redirects to special pages differently:
 984                         // Fill the HTTP response "Location" header and ignore
 985                         // the rest of the page we're on.
 986                         //
 987                         // Some pages are not valid targets
 988                         if ( $rt->isValidRedirectTarget() ) {
 989                                 return $rt->getFullURL();
 990                         } else {
 991                                 return false;
 992                         }
 993                 }
 994
 995                 return $rt;
 996         }
 997
 998         /**
 999          * Get a list of users who have edited this article, not including the user who made
1000          * the most recent revision, which you can get from $article->getUser() if you want it
1001          * @return UserArrayFromResult
1002          */
1003         public function getContributors() {
1004                 // @todo FIXME: This is expensive; cache this info somewhere.
1005
1006                 $dbr = wfGetDB( DB_SLAVE );
1007
1008                 if ( $dbr->implicitGroupby() ) {
1009                         $realNameField = 'user_real_name';
1010                 } else {
1011                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1012                 }
1013
1014                 $tables = array( 'revision', 'user' );
1015
1016                 $fields = array(
1017                         'user_id' => 'rev_user',
1018                         'user_name' => 'rev_user_text',
1019                         $realNameField,
1020                         'timestamp' => 'MAX(rev_timestamp)',
1021                 );
1022
1023                 $conds = array( 'rev_page' => $this->getId() );
1024
1025                 // The user who made the top revision gets credited as "this page was last edited by
1026                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1027                 $user = $this->getUser();
1028                 if ( $user ) {
1029                         $conds[] = "rev_user != $user";
1030                 } else {
1031                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1032                 }
1033
1034                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1035
1036                 $jconds = array(
1037                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1038                 );
1039
1040                 $options = array(
1041                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1042                         'ORDER BY' => 'timestamp DESC',
1043                 );
1044
1045                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1046                 return new UserArrayFromResult( $res );
1047         }
1048
1049         /**
1050          * Get the last N authors
1051          * @param int $num Number of revisions to get
1052          * @param int|string $revLatest The latest rev_id, selected from the master (optional)
1053          * @return array Array of authors, duplicates not removed
1054          */
1055         public function getLastNAuthors( $num, $revLatest = 0 ) {
1056                 // First try the slave
1057                 // If that doesn't have the latest revision, try the master
1058                 $continue = 2;
1059                 $db = wfGetDB( DB_SLAVE );
1060
1061                 do {
1062                         $res = $db->select( array( 'page', 'revision' ),
1063                                 array( 'rev_id', 'rev_user_text' ),
1064                                 array(
1065                                         'page_namespace' => $this->mTitle->getNamespace(),
1066                                         'page_title' => $this->mTitle->getDBkey(),
1067                                         'rev_page = page_id'
1068                                 ), __METHOD__,
1069                                 array(
1070                                         'ORDER BY' => 'rev_timestamp DESC',
1071                                         'LIMIT' => $num
1072                                 )
1073                         );
1074
1075                         if ( !$res ) {
1076                                 return array();
1077                         }
1078
1079                         $row = $db->fetchObject( $res );
1080
1081                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1082                                 $db = wfGetDB( DB_MASTER );
1083                                 $continue--;
1084                         } else {
1085                                 $continue = 0;
1086                         }
1087                 } while ( $continue );
1088
1089                 $authors = array( $row->rev_user_text );
1090
1091                 foreach ( $res as $row ) {
1092                         $authors[] = $row->rev_user_text;
1093                 }
1094
1095                 return $authors;
1096         }
1097
1098         /**
1099          * Should the parser cache be used?
1100          *
1101          * @param ParserOptions $parserOptions ParserOptions to check
1102          * @param int $oldid
1103          * @return bool
1104          */
1105         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1106                 global $wgEnableParserCache;
1107
1108                 return $wgEnableParserCache
1109                         && $parserOptions->getStubThreshold() == 0
1110                         && $this->exists()
1111                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1112                         && $this->getContentHandler()->isParserCacheSupported();
1113         }
1114
1115         /**
1116          * Get a ParserOutput for the given ParserOptions and revision ID.
1117          * The parser cache will be used if possible.
1118          *
1119          * @since 1.19
1120          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1121          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1122          *   get the current revision (default value)
1123          *
1124          * @return ParserOutput|bool ParserOutput or false if the revision was not found
1125          */
1126         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1127
1128                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1129                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1130                 if ( $parserOptions->getStubThreshold() ) {
1131                         wfIncrStats( 'pcache_miss_stub' );
1132                 }
1133
1134                 if ( $useParserCache ) {
1135                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1136                         if ( $parserOutput !== false ) {
1137                                 return $parserOutput;
1138                         }
1139                 }
1140
1141                 if ( $oldid === null || $oldid === 0 ) {
1142                         $oldid = $this->getLatest();
1143                 }
1144
1145                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1146                 $pool->execute();
1147
1148                 return $pool->getParserOutput();
1149         }
1150
1151         /**
1152          * Do standard deferred updates after page view (existing or missing page)
1153          * @param User $user The relevant user
1154          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1155          */
1156         public function doViewUpdates( User $user, $oldid = 0 ) {
1157                 if ( wfReadOnly() ) {
1158                         return;
1159                 }
1160
1161                 // Update newtalk / watchlist notification status
1162                 $user->clearNotification( $this->mTitle, $oldid );
1163         }
1164
1165         /**
1166          * Perform the actions of a page purging
1167          * @return bool
1168          */
1169         public function doPurge() {
1170                 global $wgUseSquid;
1171
1172                 if ( !Hooks::run( 'ArticlePurge', array( &$this ) ) ) {
1173                         return false;
1174                 }
1175
1176                 // Invalidate the cache
1177                 $this->mTitle->invalidateCache();
1178
1179                 if ( $wgUseSquid ) {
1180                         // Commit the transaction before the purge is sent
1181                         $dbw = wfGetDB( DB_MASTER );
1182                         $dbw->commit( __METHOD__ );
1183
1184                         // Send purge
1185                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1186                         $update->doUpdate();
1187                 }
1188
1189                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1190                         // @todo move this logic to MessageCache
1191
1192                         if ( $this->exists() ) {
1193                                 // NOTE: use transclusion text for messages.
1194                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1195
1196                                 $content = $this->getContent();
1197                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1198
1199                                 if ( $text === null ) {
1200                                         $text = false;
1201                                 }
1202                         } else {
1203                                 $text = false;
1204                         }
1205
1206                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1207                 }
1208                 return true;
1209         }
1210
1211         /**
1212          * Insert a new empty page record for this article.
1213          * This *must* be followed up by creating a revision
1214          * and running $this->updateRevisionOn( ... );
1215          * or else the record will be left in a funky state.
1216          * Best if all done inside a transaction.
1217          *
1218          * @param DatabaseBase $dbw
1219          * @return int The newly created page_id key, or false if the title already existed
1220          */
1221         public function insertOn( $dbw ) {
1222
1223                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1224                 $dbw->insert( 'page', array(
1225                         'page_id'           => $page_id,
1226                         'page_namespace'    => $this->mTitle->getNamespace(),
1227                         'page_title'        => $this->mTitle->getDBkey(),
1228                         'page_restrictions' => '',
1229                         'page_is_redirect'  => 0, // Will set this shortly...
1230                         'page_is_new'       => 1,
1231                         'page_random'       => wfRandom(),
1232                         'page_touched'      => $dbw->timestamp(),
1233                         'page_latest'       => 0, // Fill this in shortly...
1234                         'page_len'          => 0, // Fill this in shortly...
1235                 ), __METHOD__, 'IGNORE' );
1236
1237                 $affected = $dbw->affectedRows();
1238
1239                 if ( $affected ) {
1240                         $newid = $dbw->insertId();
1241                         $this->mId = $newid;
1242                         $this->mTitle->resetArticleID( $newid );
1243                 }
1244
1245                 return $affected ? $newid : false;
1246         }
1247
1248         /**
1249          * Update the page record to point to a newly saved revision.
1250          *
1251          * @param DatabaseBase $dbw
1252          * @param Revision $revision For ID number, and text used to set
1253          *   length and redirect status fields
1254          * @param int $lastRevision If given, will not overwrite the page field
1255          *   when different from the currently set value.
1256          *   Giving 0 indicates the new page flag should be set on.
1257          * @param bool $lastRevIsRedirect If given, will optimize adding and
1258          *   removing rows in redirect table.
1259          * @return bool True on success, false on failure
1260          */
1261         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1262                 $lastRevIsRedirect = null
1263         ) {
1264                 global $wgContentHandlerUseDB;
1265
1266                 $content = $revision->getContent();
1267                 $len = $content ? $content->getSize() : 0;
1268                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1269
1270                 $conditions = array( 'page_id' => $this->getId() );
1271
1272                 if ( !is_null( $lastRevision ) ) {
1273                         // An extra check against threads stepping on each other
1274                         $conditions['page_latest'] = $lastRevision;
1275                 }
1276
1277                 $now = wfTimestampNow();
1278                 $row = array( /* SET */
1279                         'page_latest'      => $revision->getId(),
1280                         'page_touched'     => $dbw->timestamp( $now ),
1281                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1282                         'page_is_redirect' => $rt !== null ? 1 : 0,
1283                         'page_len'         => $len,
1284                 );
1285
1286                 if ( $wgContentHandlerUseDB ) {
1287                         $row['page_content_model'] = $revision->getContentModel();
1288                 }
1289
1290                 $dbw->update( 'page',
1291                         $row,
1292                         $conditions,
1293                         __METHOD__ );
1294
1295                 $result = $dbw->affectedRows() > 0;
1296                 if ( $result ) {
1297                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1298                         $this->setLastEdit( $revision );
1299                         $this->setCachedLastEditTime( $now );
1300                         $this->mLatest = $revision->getId();
1301                         $this->mIsRedirect = (bool)$rt;
1302                         // Update the LinkCache.
1303                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1304                                                                                                         $this->mLatest, $revision->getContentModel() );
1305                 }
1306
1307                 return $result;
1308         }
1309
1310         /**
1311          * Add row to the redirect table if this is a redirect, remove otherwise.
1312          *
1313          * @param DatabaseBase $dbw
1314          * @param Title $redirectTitle Title object pointing to the redirect target,
1315          *   or NULL if this is not a redirect
1316          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1317          *   removing rows in redirect table.
1318          * @return bool True on success, false on failure
1319          * @private
1320          */
1321         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1322                 // Always update redirects (target link might have changed)
1323                 // Update/Insert if we don't know if the last revision was a redirect or not
1324                 // Delete if changing from redirect to non-redirect
1325                 $isRedirect = !is_null( $redirectTitle );
1326
1327                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1328                         return true;
1329                 }
1330
1331                 if ( $isRedirect ) {
1332                         $this->insertRedirectEntry( $redirectTitle );
1333                 } else {
1334                         // This is not a redirect, remove row from redirect table
1335                         $where = array( 'rd_from' => $this->getId() );
1336                         $dbw->delete( 'redirect', $where, __METHOD__ );
1337                 }
1338
1339                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1340                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1341                 }
1342
1343                 return ( $dbw->affectedRows() != 0 );
1344         }
1345
1346         /**
1347          * If the given revision is newer than the currently set page_latest,
1348          * update the page record. Otherwise, do nothing.
1349          *
1350          * @deprecated since 1.24, use updateRevisionOn instead
1351          *
1352          * @param DatabaseBase $dbw
1353          * @param Revision $revision
1354          * @return bool
1355          */
1356         public function updateIfNewerOn( $dbw, $revision ) {
1357
1358                 $row = $dbw->selectRow(
1359                         array( 'revision', 'page' ),
1360                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1361                         array(
1362                                 'page_id' => $this->getId(),
1363                                 'page_latest=rev_id' ),
1364                         __METHOD__ );
1365
1366                 if ( $row ) {
1367                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1368                                 return false;
1369                         }
1370                         $prev = $row->rev_id;
1371                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1372                 } else {
1373                         // No or missing previous revision; mark the page as new
1374                         $prev = 0;
1375                         $lastRevIsRedirect = null;
1376                 }
1377
1378                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1379
1380                 return $ret;
1381         }
1382
1383         /**
1384          * Get the content that needs to be saved in order to undo all revisions
1385          * between $undo and $undoafter. Revisions must belong to the same page,
1386          * must exist and must not be deleted
1387          * @param Revision $undo
1388          * @param Revision $undoafter Must be an earlier revision than $undo
1389          * @return mixed String on success, false on failure
1390          * @since 1.21
1391          * Before we had the Content object, this was done in getUndoText
1392          */
1393         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1394                 $handler = $undo->getContentHandler();
1395                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1396         }
1397
1398         /**
1399          * Get the text that needs to be saved in order to undo all revisions
1400          * between $undo and $undoafter. Revisions must belong to the same page,
1401          * must exist and must not be deleted
1402          * @param Revision $undo
1403          * @param Revision $undoafter Must be an earlier revision than $undo
1404          * @return string|bool String on success, false on failure
1405          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1406          */
1407         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1408                 ContentHandler::deprecated( __METHOD__, '1.21' );
1409
1410                 $this->loadLastEdit();
1411
1412                 if ( $this->mLastRevision ) {
1413                         if ( is_null( $undoafter ) ) {
1414                                 $undoafter = $undo->getPrevious();
1415                         }
1416
1417                         $handler = $this->getContentHandler();
1418                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1419
1420                         if ( !$undone ) {
1421                                 return false;
1422                         } else {
1423                                 return ContentHandler::getContentText( $undone );
1424                         }
1425                 }
1426
1427                 return false;
1428         }
1429
1430         /**
1431          * @param string|number|null|bool $sectionId Section identifier as a number or string
1432          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1433          * or 'new' for a new section.
1434          * @param string $text New text of the section.
1435          * @param string $sectionTitle New section's subject, only if $section is "new".
1436          * @param string $edittime Revision timestamp or null to use the current revision.
1437          *
1438          * @throws MWException
1439          * @return string New complete article text, or null if error.
1440          *
1441          * @deprecated since 1.21, use replaceSectionAtRev() instead
1442          */
1443         public function replaceSection( $sectionId, $text, $sectionTitle = '',
1444                 $edittime = null
1445         ) {
1446                 ContentHandler::deprecated( __METHOD__, '1.21' );
1447
1448                 //NOTE: keep condition in sync with condition in replaceSectionContent!
1449                 if ( strval( $sectionId ) === '' ) {
1450                         // Whole-page edit; let the whole text through
1451                         return $text;
1452                 }
1453
1454                 if ( !$this->supportsSections() ) {
1455                         throw new MWException( "sections not supported for content model " .
1456                                 $this->getContentHandler()->getModelID() );
1457                 }
1458
1459                 // could even make section title, but that's not required.
1460                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1461
1462                 $newContent = $this->replaceSectionContent( $sectionId, $sectionContent, $sectionTitle,
1463                         $edittime );
1464
1465                 return ContentHandler::getContentText( $newContent );
1466         }
1467
1468         /**
1469          * Returns true if this page's content model supports sections.
1470          *
1471          * @return bool
1472          *
1473          * @todo The skin should check this and not offer section functionality if
1474          *   sections are not supported.
1475          * @todo The EditPage should check this and not offer section functionality
1476          *   if sections are not supported.
1477          */
1478         public function supportsSections() {
1479                 return $this->getContentHandler()->supportsSections();
1480         }
1481
1482         /**
1483          * @param string|number|null|bool $sectionId Section identifier as a number or string
1484          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1485          * or 'new' for a new section.
1486          * @param Content $sectionContent New content of the section.
1487          * @param string $sectionTitle New section's subject, only if $section is "new".
1488          * @param string $edittime Revision timestamp or null to use the current revision.
1489          *
1490          * @throws MWException
1491          * @return Content New complete article content, or null if error.
1492          *
1493          * @since 1.21
1494          * @deprecated since 1.24, use replaceSectionAtRev instead
1495          */
1496         public function replaceSectionContent( $sectionId, Content $sectionContent, $sectionTitle = '',
1497                 $edittime = null ) {
1498
1499                 $baseRevId = null;
1500                 if ( $edittime && $sectionId !== 'new' ) {
1501                         $dbw = wfGetDB( DB_MASTER );
1502                         $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1503                         if ( $rev ) {
1504                                 $baseRevId = $rev->getId();
1505                         }
1506                 }
1507
1508                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1509         }
1510
1511         /**
1512          * @param string|number|null|bool $sectionId Section identifier as a number or string
1513          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1514          * or 'new' for a new section.
1515          * @param Content $sectionContent New content of the section.
1516          * @param string $sectionTitle New section's subject, only if $section is "new".
1517          * @param int|null $baseRevId
1518          *
1519          * @throws MWException
1520          * @return Content New complete article content, or null if error.
1521          *
1522          * @since 1.24
1523          */
1524         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1525                 $sectionTitle = '', $baseRevId = null
1526         ) {
1527
1528                 if ( strval( $sectionId ) === '' ) {
1529                         // Whole-page edit; let the whole text through
1530                         $newContent = $sectionContent;
1531                 } else {
1532                         if ( !$this->supportsSections() ) {
1533                                 throw new MWException( "sections not supported for content model " .
1534                                         $this->getContentHandler()->getModelID() );
1535                         }
1536
1537                         // Bug 30711: always use current version when adding a new section
1538                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1539                                 $oldContent = $this->getContent();
1540                         } else {
1541                                 // TODO: try DB_SLAVE first
1542                                 $dbw = wfGetDB( DB_MASTER );
1543                                 $rev = Revision::loadFromId( $dbw, $baseRevId );
1544
1545                                 if ( !$rev ) {
1546                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1547                                                 $this->getId() . "; section: $sectionId)\n" );
1548                                         return null;
1549                                 }
1550
1551                                 $oldContent = $rev->getContent();
1552                         }
1553
1554                         if ( !$oldContent ) {
1555                                 wfDebug( __METHOD__ . ": no page text\n" );
1556                                 return null;
1557                         }
1558
1559                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1560                 }
1561
1562                 return $newContent;
1563         }
1564
1565         /**
1566          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1567          * @param int $flags
1568          * @return int Updated $flags
1569          */
1570         public function checkFlags( $flags ) {
1571                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1572                         if ( $this->exists() ) {
1573                                 $flags |= EDIT_UPDATE;
1574                         } else {
1575                                 $flags |= EDIT_NEW;
1576                         }
1577                 }
1578
1579                 return $flags;
1580         }
1581
1582         /**
1583          * Change an existing article or create a new article. Updates RC and all necessary caches,
1584          * optionally via the deferred update array.
1585          *
1586          * @param string $text New text
1587          * @param string $summary Edit summary
1588          * @param int $flags Bitfield:
1589          *      EDIT_NEW
1590          *          Article is known or assumed to be non-existent, create a new one
1591          *      EDIT_UPDATE
1592          *          Article is known or assumed to be pre-existing, update it
1593          *      EDIT_MINOR
1594          *          Mark this edit minor, if the user is allowed to do so
1595          *      EDIT_SUPPRESS_RC
1596          *          Do not log the change in recentchanges
1597          *      EDIT_FORCE_BOT
1598          *          Mark the edit a "bot" edit regardless of user rights
1599          *      EDIT_DEFER_UPDATES
1600          *          Defer some of the updates until the end of index.php
1601          *      EDIT_AUTOSUMMARY
1602          *          Fill in blank summaries with generated text where possible
1603          *
1604          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1605          * article will be detected. If EDIT_UPDATE is specified and the article
1606          * doesn't exist, the function will return an edit-gone-missing error. If
1607          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1608          * error will be returned. These two conditions are also possible with
1609          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1610          *
1611          * @param bool|int $baseRevId The revision ID this edit was based off, if any
1612          * @param User $user The user doing the edit
1613          *
1614          * @throws MWException
1615          * @return Status Possible errors:
1616          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1617          *     set the fatal flag of $status
1618          *   edit-gone-missing: In update mode, but the article didn't exist.
1619          *   edit-conflict: In update mode, the article changed unexpectedly.
1620          *   edit-no-change: Warning that the text was the same as before.
1621          *   edit-already-exists: In creation mode, but the article already exists.
1622          *
1623          * Extensions may define additional errors.
1624          *
1625          * $return->value will contain an associative array with members as follows:
1626          *     new: Boolean indicating if the function attempted to create a new article.
1627          *     revision: The revision object for the inserted revision, or null.
1628          *
1629          * Compatibility note: this function previously returned a boolean value
1630          * indicating success/failure
1631          *
1632          * @deprecated since 1.21: use doEditContent() instead.
1633          */
1634         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1635                 ContentHandler::deprecated( __METHOD__, '1.21' );
1636
1637                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1638
1639                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1640         }
1641
1642         /**
1643          * Change an existing article or create a new article. Updates RC and all necessary caches,
1644          * optionally via the deferred update array.
1645          *
1646          * @param Content $content New content
1647          * @param string $summary Edit summary
1648          * @param int $flags Bitfield:
1649          *      EDIT_NEW
1650          *          Article is known or assumed to be non-existent, create a new one
1651          *      EDIT_UPDATE
1652          *          Article is known or assumed to be pre-existing, update it
1653          *      EDIT_MINOR
1654          *          Mark this edit minor, if the user is allowed to do so
1655          *      EDIT_SUPPRESS_RC
1656          *          Do not log the change in recentchanges
1657          *      EDIT_FORCE_BOT
1658          *          Mark the edit a "bot" edit regardless of user rights
1659          *      EDIT_DEFER_UPDATES
1660          *          Defer some of the updates until the end of index.php
1661          *      EDIT_AUTOSUMMARY
1662          *          Fill in blank summaries with generated text where possible
1663          *
1664          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1665          * article will be detected. If EDIT_UPDATE is specified and the article
1666          * doesn't exist, the function will return an edit-gone-missing error. If
1667          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1668          * error will be returned. These two conditions are also possible with
1669          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1670          *
1671          * @param bool|int $baseRevId The revision ID this edit was based off, if any
1672          * @param User $user The user doing the edit
1673          * @param string $serialFormat Format for storing the content in the
1674          *   database.
1675          *
1676          * @throws MWException
1677          * @return Status Possible errors:
1678          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1679          *       set the fatal flag of $status.
1680          *     edit-gone-missing: In update mode, but the article didn't exist.
1681          *     edit-conflict: In update mode, the article changed unexpectedly.
1682          *     edit-no-change: Warning that the text was the same as before.
1683          *     edit-already-exists: In creation mode, but the article already exists.
1684          *
1685          *  Extensions may define additional errors.
1686          *
1687          *  $return->value will contain an associative array with members as follows:
1688          *     new: Boolean indicating if the function attempted to create a new article.
1689          *     revision: The revision object for the inserted revision, or null.
1690          *
1691          * @since 1.21
1692          */
1693         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1694                 User $user = null, $serialFormat = null
1695         ) {
1696                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1697
1698                 // Low-level sanity check
1699                 if ( $this->mTitle->getText() === '' ) {
1700                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1701                 }
1702
1703                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1704                         return Status::newFatal( 'content-not-allowed-here',
1705                                 ContentHandler::getLocalizedName( $content->getModel() ),
1706                                 $this->getTitle()->getPrefixedText() );
1707                 }
1708
1709                 $user = is_null( $user ) ? $wgUser : $user;
1710                 $status = Status::newGood( array() );
1711
1712                 // Load the data from the master database if needed.
1713                 // The caller may already loaded it from the master or even loaded it using
1714                 // SELECT FOR UPDATE, so do not override that using clear().
1715                 $this->loadPageData( 'fromdbmaster' );
1716
1717                 $flags = $this->checkFlags( $flags );
1718
1719                 // handle hook
1720                 $hook_args = array( &$this, &$user, &$content, &$summary,
1721                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1722
1723                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1724                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1725
1726                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1727
1728                         if ( $status->isOK() ) {
1729                                 $status->fatal( 'edit-hook-aborted' );
1730                         }
1731
1732                         return $status;
1733                 }
1734
1735                 // Silently ignore EDIT_MINOR if not allowed
1736                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1737                 $bot = $flags & EDIT_FORCE_BOT;
1738
1739                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1740
1741                 $oldsize = $old_content ? $old_content->getSize() : 0;
1742                 $oldid = $this->getLatest();
1743                 $oldIsRedirect = $this->isRedirect();
1744                 $oldcountable = $this->isCountable();
1745
1746                 $handler = $content->getContentHandler();
1747
1748                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1749                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1750                         if ( !$old_content ) {
1751                                 $old_content = null;
1752                         }
1753                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1754                 }
1755
1756                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat );
1757                 $serialized = $editInfo->pst;
1758
1759                 /**
1760                  * @var Content $content
1761                  */
1762                 $content = $editInfo->pstContent;
1763                 $newsize = $content->getSize();
1764
1765                 $dbw = wfGetDB( DB_MASTER );
1766                 $now = wfTimestampNow();
1767                 $this->mTimestamp = $now;
1768
1769                 if ( $flags & EDIT_UPDATE ) {
1770                         // Update article, but only if changed.
1771                         $status->value['new'] = false;
1772
1773                         if ( !$oldid ) {
1774                                 // Article gone missing
1775                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1776                                 $status->fatal( 'edit-gone-missing' );
1777
1778                                 return $status;
1779                         } elseif ( !$old_content ) {
1780                                 // Sanity check for bug 37225
1781                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1782                         }
1783
1784                         $revision = new Revision( array(
1785                                 'page'       => $this->getId(),
1786                                 'title'      => $this->getTitle(), // for determining the default content model
1787                                 'comment'    => $summary,
1788                                 'minor_edit' => $isminor,
1789                                 'text'       => $serialized,
1790                                 'len'        => $newsize,
1791                                 'parent_id'  => $oldid,
1792                                 'user'       => $user->getId(),
1793                                 'user_text'  => $user->getName(),
1794                                 'timestamp'  => $now,
1795                                 'content_model' => $content->getModel(),
1796                                 'content_format' => $serialFormat,
1797                         ) ); // XXX: pass content object?!
1798
1799                         $changed = !$content->equals( $old_content );
1800
1801                         if ( $changed ) {
1802                                 $dbw->begin( __METHOD__ );
1803                                 try {
1804
1805                                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1806                                         $status->merge( $prepStatus );
1807
1808                                         if ( !$status->isOK() ) {
1809                                                 $dbw->rollback( __METHOD__ );
1810
1811                                                 return $status;
1812                                         }
1813                                         $revisionId = $revision->insertOn( $dbw );
1814
1815                                         // Update page
1816                                         //
1817                                         // We check for conflicts by comparing $oldid with the current latest revision ID.
1818                                         $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1819
1820                                         if ( !$ok ) {
1821                                                 // Belated edit conflict! Run away!!
1822                                                 $status->fatal( 'edit-conflict' );
1823
1824                                                 $dbw->rollback( __METHOD__ );
1825
1826                                                 return $status;
1827                                         }
1828
1829                                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1830                                         // Update recentchanges
1831                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1832                                                 // Mark as patrolled if the user can do so
1833                                                 $patrolled = $wgUseRCPatrol && !count(
1834                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1835                                                 // Add RC row to the DB
1836                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1837                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1838                                                         $revisionId, $patrolled
1839                                                 );
1840
1841                                                 // Log auto-patrolled edits
1842                                                 if ( $patrolled ) {
1843                                                         PatrolLog::record( $rc, true, $user );
1844                                                 }
1845                                         }
1846                                         $user->incEditCount();
1847                                 } catch ( Exception $e ) {
1848                                         $dbw->rollback( __METHOD__ );
1849                                         // Question: Would it perhaps be better if this method turned all
1850                                         // exceptions into $status's?
1851                                         throw $e;
1852                                 }
1853                                 $dbw->commit( __METHOD__ );
1854                         } else {
1855                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1856                                 // related variables correctly
1857                                 $revision->setId( $this->getLatest() );
1858                         }
1859
1860                         // Update links tables, site stats, etc.
1861                         $this->doEditUpdates(
1862                                 $revision,
1863                                 $user,
1864                                 array(
1865                                         'changed' => $changed,
1866                                         'oldcountable' => $oldcountable
1867                                 )
1868                         );
1869
1870                         if ( !$changed ) {
1871                                 $status->warning( 'edit-no-change' );
1872                                 $revision = null;
1873                                 // Update page_touched, this is usually implicit in the page update
1874                                 // Other cache updates are done in onArticleEdit()
1875                                 $this->mTitle->invalidateCache();
1876                         }
1877                 } else {
1878                         // Create new article
1879                         $status->value['new'] = true;
1880
1881                         $dbw->begin( __METHOD__ );
1882                         try {
1883
1884                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1885                                 $status->merge( $prepStatus );
1886
1887                                 if ( !$status->isOK() ) {
1888                                         $dbw->rollback( __METHOD__ );
1889
1890                                         return $status;
1891                                 }
1892
1893                                 $status->merge( $prepStatus );
1894
1895                                 // Add the page record; stake our claim on this title!
1896                                 // This will return false if the article already exists
1897                                 $newid = $this->insertOn( $dbw );
1898
1899                                 if ( $newid === false ) {
1900                                         $dbw->rollback( __METHOD__ );
1901                                         $status->fatal( 'edit-already-exists' );
1902
1903                                         return $status;
1904                                 }
1905
1906                                 // Save the revision text...
1907                                 $revision = new Revision( array(
1908                                         'page'       => $newid,
1909                                         'title'      => $this->getTitle(), // for determining the default content model
1910                                         'comment'    => $summary,
1911                                         'minor_edit' => $isminor,
1912                                         'text'       => $serialized,
1913                                         'len'        => $newsize,
1914                                         'user'       => $user->getId(),
1915                                         'user_text'  => $user->getName(),
1916                                         'timestamp'  => $now,
1917                                         'content_model' => $content->getModel(),
1918                                         'content_format' => $serialFormat,
1919                                 ) );
1920                                 $revisionId = $revision->insertOn( $dbw );
1921
1922                                 // Bug 37225: use accessor to get the text as Revision may trim it
1923                                 $content = $revision->getContent(); // sanity; get normalized version
1924
1925                                 if ( $content ) {
1926                                         $newsize = $content->getSize();
1927                                 }
1928
1929                                 // Update the page record with revision data
1930                                 $this->updateRevisionOn( $dbw, $revision, 0 );
1931
1932                                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1933
1934                                 // Update recentchanges
1935                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1936                                         // Mark as patrolled if the user can do so
1937                                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1938                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1939                                         // Add RC row to the DB
1940                                         $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1941                                                 '', $newsize, $revisionId, $patrolled );
1942
1943                                         // Log auto-patrolled edits
1944                                         if ( $patrolled ) {
1945                                                 PatrolLog::record( $rc, true, $user );
1946                                         }
1947                                 }
1948                                 $user->incEditCount();
1949
1950                         } catch ( Exception $e ) {
1951                                 $dbw->rollback( __METHOD__ );
1952                                 throw $e;
1953                         }
1954                         $dbw->commit( __METHOD__ );
1955
1956                         // Update links, etc.
1957                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1958
1959                         $hook_args = array( &$this, &$user, $content, $summary,
1960                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1961
1962                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1963                         Hooks::run( 'PageContentInsertComplete', $hook_args );
1964                 }
1965
1966                 // Do updates right now unless deferral was requested
1967                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1968                         DeferredUpdates::doUpdates();
1969                 }
1970
1971                 // Return the new revision (or null) to the caller
1972                 $status->value['revision'] = $revision;
1973
1974                 $hook_args = array( &$this, &$user, $content, $summary,
1975                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1976
1977                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1978                 Hooks::run( 'PageContentSaveComplete', $hook_args );
1979
1980                 // Promote user to any groups they meet the criteria for
1981                 $dbw->onTransactionIdle( function () use ( $user ) {
1982                         $user->addAutopromoteOnceGroups( 'onEdit' );
1983                 } );
1984
1985                 return $status;
1986         }
1987
1988         /**
1989          * Get parser options suitable for rendering the primary article wikitext
1990          *
1991          * @see ContentHandler::makeParserOptions
1992          *
1993          * @param IContextSource|User|string $context One of the following:
1994          *        - IContextSource: Use the User and the Language of the provided
1995          *          context
1996          *        - User: Use the provided User object and $wgLang for the language,
1997          *          so use an IContextSource object if possible.
1998          *        - 'canonical': Canonical options (anonymous user with default
1999          *          preferences and content language).
2000          * @return ParserOptions
2001          */
2002         public function makeParserOptions( $context ) {
2003                 $options = $this->getContentHandler()->makeParserOptions( $context );
2004
2005                 if ( $this->getTitle()->isConversionTable() ) {
2006                         // @todo ConversionTable should become a separate content model, so
2007                         // we don't need special cases like this one.
2008                         $options->disableContentConversion();
2009                 }
2010
2011                 return $options;
2012         }
2013
2014         /**
2015          * Prepare text which is about to be saved.
2016          * Returns a stdClass with source, pst and output members
2017          *
2018          * @deprecated since 1.21: use prepareContentForEdit instead.
2019          * @return object
2020          */
2021         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2022                 ContentHandler::deprecated( __METHOD__, '1.21' );
2023                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2024                 return $this->prepareContentForEdit( $content, $revid, $user );
2025         }
2026
2027         /**
2028          * Prepare content which is about to be saved.
2029          * Returns a stdClass with source, pst and output members
2030          *
2031          * @param Content $content
2032          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2033          *        revision ID is also accepted, but this is deprecated.
2034          * @param User|null $user
2035          * @param string|null $serialFormat
2036          * @param bool $useCache Check shared prepared edit cache
2037          *
2038          * @return object
2039          *
2040          * @since 1.21
2041          */
2042         public function prepareContentForEdit(
2043                 Content $content, $revision = null, User $user = null, $serialFormat = null, $useCache = true
2044         ) {
2045                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2046
2047                 if ( is_object( $revision ) ) {
2048                         $revid = $revision->getId();
2049                 } else {
2050                         $revid = $revision;
2051                         // This code path is deprecated, and nothing is known to
2052                         // use it, so performance here shouldn't be a worry.
2053                         if ( $revid !== null ) {
2054                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2055                         } else {
2056                                 $revision = null;
2057                         }
2058                 }
2059
2060                 $user = is_null( $user ) ? $wgUser : $user;
2061                 //XXX: check $user->getId() here???
2062
2063                 // Use a sane default for $serialFormat, see bug 57026
2064                 if ( $serialFormat === null ) {
2065                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2066                 }
2067
2068                 if ( $this->mPreparedEdit
2069                         && $this->mPreparedEdit->newContent
2070                         && $this->mPreparedEdit->newContent->equals( $content )
2071                         && $this->mPreparedEdit->revid == $revid
2072                         && $this->mPreparedEdit->format == $serialFormat
2073                         // XXX: also check $user here?
2074                 ) {
2075                         // Already prepared
2076                         return $this->mPreparedEdit;
2077                 }
2078
2079                 // The edit may have already been prepared via api.php?action=stashedit
2080                 $cachedEdit = $useCache && $wgAjaxEditStash
2081                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2082                         : false;
2083
2084                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2085                 Hooks::run( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2086
2087                 $edit = (object)array();
2088                 if ( $cachedEdit ) {
2089                         $edit->timestamp = $cachedEdit->timestamp;
2090                 } else {
2091                         $edit->timestamp = wfTimestampNow();
2092                 }
2093                 // @note: $cachedEdit is not used if the rev ID was referenced in the text
2094                 $edit->revid = $revid;
2095
2096                 if ( $cachedEdit ) {
2097                         $edit->pstContent = $cachedEdit->pstContent;
2098                 } else {
2099                         $edit->pstContent = $content
2100                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2101                                 : null;
2102                 }
2103
2104                 $edit->format = $serialFormat;
2105                 $edit->popts = $this->makeParserOptions( 'canonical' );
2106                 if ( $cachedEdit ) {
2107                         $edit->output = $cachedEdit->output;
2108                 } else {
2109                         if ( $revision ) {
2110                                 // We get here if vary-revision is set. This means that this page references
2111                                 // itself (such as via self-transclusion). In this case, we need to make sure
2112                                 // that any such self-references refer to the newly-saved revision, and not
2113                                 // to the previous one, which could otherwise happen due to slave lag.
2114                                 $oldCallback = $edit->popts->setCurrentRevisionCallback(
2115                                         function ( $title, $parser = false ) use ( $revision, &$oldCallback ) {
2116                                                 if ( $title->equals( $revision->getTitle() ) ) {
2117                                                         return $revision;
2118                                                 } else {
2119                                                         return call_user_func(
2120                                                                 $oldCallback,
2121                                                                 $title,
2122                                                                 $parser
2123                                                         );
2124                                                 }
2125                                         }
2126                                 );
2127                         }
2128                         $edit->output = $edit->pstContent
2129                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2130                                 : null;
2131                 }
2132
2133                 $edit->newContent = $content;
2134                 $edit->oldContent = $this->getContent( Revision::RAW );
2135
2136                 // NOTE: B/C for hooks! don't use these fields!
2137                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2138                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2139                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2140
2141                 $this->mPreparedEdit = $edit;
2142                 return $edit;
2143         }
2144
2145         /**
2146          * Do standard deferred updates after page edit.
2147          * Update links tables, site stats, search index and message cache.
2148          * Purges pages that include this page if the text was changed here.
2149          * Every 100th edit, prune the recent changes table.
2150          *
2151          * @param Revision $revision
2152          * @param User $user User object that did the revision
2153          * @param array $options Array of options, following indexes are used:
2154          * - changed: boolean, whether the revision changed the content (default true)
2155          * - created: boolean, whether the revision created the page (default false)
2156          * - moved: boolean, whether the page was moved (default false)
2157          * - oldcountable: boolean, null, or string 'no-change' (default null):
2158          *   - boolean: whether the page was counted as an article before that
2159          *     revision, only used in changed is true and created is false
2160          *   - null: if created is false, don't update the article count; if created
2161          *     is true, do update the article count
2162          *   - 'no-change': don't update the article count, ever
2163          */
2164         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2165                 global $wgEnableParserCache;
2166
2167                 $options += array(
2168                         'changed' => true,
2169                         'created' => false,
2170                         'moved' => false,
2171                         'oldcountable' => null
2172                 );
2173                 $content = $revision->getContent();
2174
2175                 // Parse the text
2176                 // Be careful not to do pre-save transform twice: $text is usually
2177                 // already pre-save transformed once.
2178                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2179                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2180                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user );
2181                 } else {
2182                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2183                         $editInfo = $this->mPreparedEdit;
2184                 }
2185
2186                 // Save it to the parser cache
2187                 if ( $wgEnableParserCache ) {
2188                         $parserCache = ParserCache::singleton();
2189                         $parserCache->save(
2190                                 $editInfo->output, $this, $editInfo->popts, $editInfo->timestamp, $editInfo->revid
2191                         );
2192                 }
2193
2194                 // Update the links tables and other secondary data
2195                 if ( $content ) {
2196                         $recursive = $options['changed']; // bug 50785
2197                         $updates = $content->getSecondaryDataUpdates(
2198                                 $this->getTitle(), null, $recursive, $editInfo->output );
2199                         DataUpdate::runUpdates( $updates );
2200                 }
2201
2202                 Hooks::run( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2203
2204                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2205                         // Flush old entries from the `recentchanges` table
2206                         JobQueueGroup::singleton()->push( RecentChangesUpdateJob::newPurgeJob() );
2207                 }
2208
2209                 if ( !$this->exists() ) {
2210                         return;
2211                 }
2212
2213                 $id = $this->getId();
2214                 $title = $this->mTitle->getPrefixedDBkey();
2215                 $shortTitle = $this->mTitle->getDBkey();
2216
2217                 if ( $options['oldcountable'] === 'no-change' ||
2218                         ( !$options['changed'] && !$options['moved'] )
2219                 ) {
2220                         $good = 0;
2221                 } elseif ( $options['created'] ) {
2222                         $good = (int)$this->isCountable( $editInfo );
2223                 } elseif ( $options['oldcountable'] !== null ) {
2224                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2225                 } else {
2226                         $good = 0;
2227                 }
2228                 $edits = $options['changed'] ? 1 : 0;
2229                 $total = $options['created'] ? 1 : 0;
2230
2231                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2232                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2233
2234                 // If this is another user's talk page, update newtalk.
2235                 // Don't do this if $options['changed'] = false (null-edits) nor if
2236                 // it's a minor edit and the user doesn't want notifications for those.
2237                 if ( $options['changed']
2238                         && $this->mTitle->getNamespace() == NS_USER_TALK
2239                         && $shortTitle != $user->getTitleKey()
2240                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2241                 ) {
2242                         $recipient = User::newFromName( $shortTitle, false );
2243                         if ( !$recipient ) {
2244                                 wfDebug( __METHOD__ . ": invalid username\n" );
2245                         } else {
2246                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2247                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2248                                         if ( User::isIP( $shortTitle ) ) {
2249                                                 // An anonymous user
2250                                                 $recipient->setNewtalk( true, $revision );
2251                                         } elseif ( $recipient->isLoggedIn() ) {
2252                                                 $recipient->setNewtalk( true, $revision );
2253                                         } else {
2254                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2255                                         }
2256                                 }
2257                         }
2258                 }
2259
2260                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2261                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2262                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2263                         if ( $msgtext === false || $msgtext === null ) {
2264                                 $msgtext = '';
2265                         }
2266
2267                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2268                 }
2269
2270                 if ( $options['created'] ) {
2271                         self::onArticleCreate( $this->mTitle );
2272                 } elseif ( $options['changed'] ) { // bug 50785
2273                         self::onArticleEdit( $this->mTitle );
2274                 }
2275
2276         }
2277
2278         /**
2279          * Edit an article without doing all that other stuff
2280          * The article must already exist; link tables etc
2281          * are not updated, caches are not flushed.
2282          *
2283          * @param string $text Text submitted
2284          * @param User $user The relevant user
2285          * @param string $comment Comment submitted
2286          * @param bool $minor Whereas it's a minor modification
2287          *
2288          * @deprecated since 1.21, use doEditContent() instead.
2289          */
2290         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2291                 ContentHandler::deprecated( __METHOD__, "1.21" );
2292
2293                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2294                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2295         }
2296
2297         /**
2298          * Edit an article without doing all that other stuff
2299          * The article must already exist; link tables etc
2300          * are not updated, caches are not flushed.
2301          *
2302          * @param Content $content Content submitted
2303          * @param User $user The relevant user
2304          * @param string $comment Comment submitted
2305          * @param bool $minor Whereas it's a minor modification
2306          * @param string $serialFormat Format for storing the content in the database
2307          */
2308         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2309                 $serialFormat = null
2310         ) {
2311
2312                 $serialized = $content->serialize( $serialFormat );
2313
2314                 $dbw = wfGetDB( DB_MASTER );
2315                 $revision = new Revision( array(
2316                         'title'      => $this->getTitle(), // for determining the default content model
2317                         'page'       => $this->getId(),
2318                         'user_text'  => $user->getName(),
2319                         'user'       => $user->getId(),
2320                         'text'       => $serialized,
2321                         'length'     => $content->getSize(),
2322                         'comment'    => $comment,
2323                         'minor_edit' => $minor ? 1 : 0,
2324                 ) ); // XXX: set the content object?
2325                 $revision->insertOn( $dbw );
2326                 $this->updateRevisionOn( $dbw, $revision );
2327
2328                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2329
2330         }
2331
2332         /**
2333          * Update the article's restriction field, and leave a log entry.
2334          * This works for protection both existing and non-existing pages.
2335          *
2336          * @param array $limit Set of restriction keys
2337          * @param array $expiry Per restriction type expiration
2338          * @param int &$cascade Set to false if cascading protection isn't allowed.
2339          * @param string $reason
2340          * @param User $user The user updating the restrictions
2341          * @return Status
2342          */
2343         public function doUpdateRestrictions( array $limit, array $expiry,
2344                 &$cascade, $reason, User $user
2345         ) {
2346                 global $wgCascadingRestrictionLevels, $wgContLang;
2347
2348                 if ( wfReadOnly() ) {
2349                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2350                 }
2351
2352                 $this->loadPageData( 'fromdbmaster' );
2353                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2354                 $id = $this->getId();
2355
2356                 if ( !$cascade ) {
2357                         $cascade = false;
2358                 }
2359
2360                 // Take this opportunity to purge out expired restrictions
2361                 Title::purgeExpiredRestrictions();
2362
2363                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2364                 // we expect a single selection, but the schema allows otherwise.
2365                 $isProtected = false;
2366                 $protect = false;
2367                 $changed = false;
2368
2369                 $dbw = wfGetDB( DB_MASTER );
2370
2371                 foreach ( $restrictionTypes as $action ) {
2372                         if ( !isset( $expiry[$action] ) ) {
2373                                 $expiry[$action] = $dbw->getInfinity();
2374                         }
2375                         if ( !isset( $limit[$action] ) ) {
2376                                 $limit[$action] = '';
2377                         } elseif ( $limit[$action] != '' ) {
2378                                 $protect = true;
2379                         }
2380
2381                         // Get current restrictions on $action
2382                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2383                         if ( $current != '' ) {
2384                                 $isProtected = true;
2385                         }
2386
2387                         if ( $limit[$action] != $current ) {
2388                                 $changed = true;
2389                         } elseif ( $limit[$action] != '' ) {
2390                                 // Only check expiry change if the action is actually being
2391                                 // protected, since expiry does nothing on an not-protected
2392                                 // action.
2393                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2394                                         $changed = true;
2395                                 }
2396                         }
2397                 }
2398
2399                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2400                         $changed = true;
2401                 }
2402
2403                 // If nothing has changed, do nothing
2404                 if ( !$changed ) {
2405                         return Status::newGood();
2406                 }
2407
2408                 if ( !$protect ) { // No protection at all means unprotection
2409                         $revCommentMsg = 'unprotectedarticle';
2410                         $logAction = 'unprotect';
2411                 } elseif ( $isProtected ) {
2412                         $revCommentMsg = 'modifiedarticleprotection';
2413                         $logAction = 'modify';
2414                 } else {
2415                         $revCommentMsg = 'protectedarticle';
2416                         $logAction = 'protect';
2417                 }
2418
2419                 // Truncate for whole multibyte characters
2420                 $reason = $wgContLang->truncate( $reason, 255 );
2421
2422                 $logRelationsValues = array();
2423                 $logRelationsField = null;
2424
2425                 if ( $id ) { // Protection of existing page
2426                         if ( !Hooks::run( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2427                                 return Status::newGood();
2428                         }
2429
2430                         // Only certain restrictions can cascade...
2431                         $editrestriction = isset( $limit['edit'] )
2432                                 ? array( $limit['edit'] )
2433                                 : $this->mTitle->getRestrictions( 'edit' );
2434                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2435                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2436                         }
2437                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2438                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2439                         }
2440
2441                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2442                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2443                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2444                         }
2445                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2446                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2447                         }
2448
2449                         // The schema allows multiple restrictions
2450                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2451                                 $cascade = false;
2452                         }
2453
2454                         // insert null revision to identify the page protection change as edit summary
2455                         $latest = $this->getLatest();
2456                         $nullRevision = $this->insertProtectNullRevision(
2457                                 $revCommentMsg,
2458                                 $limit,
2459                                 $expiry,
2460                                 $cascade,
2461                                 $reason,
2462                                 $user
2463                         );
2464
2465                         if ( $nullRevision === null ) {
2466                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2467                         }
2468
2469                         $logRelationsField = 'pr_id';
2470
2471                         // Update restrictions table
2472                         foreach ( $limit as $action => $restrictions ) {
2473                                 $dbw->delete(
2474                                         'page_restrictions',
2475                                         array(
2476                                                 'pr_page' => $id,
2477                                                 'pr_type' => $action
2478                                         ),
2479                                         __METHOD__
2480                                 );
2481                                 if ( $restrictions != '' ) {
2482                                         $dbw->insert(
2483                                                 'page_restrictions',
2484                                                 array(
2485                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2486                                                         'pr_page' => $id,
2487                                                         'pr_type' => $action,
2488                                                         'pr_level' => $restrictions,
2489                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2490                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2491                                                 ),
2492                                                 __METHOD__
2493                                         );
2494                                         $logRelationsValues[] = $dbw->insertId();
2495                                 }
2496                         }
2497
2498                         // Clear out legacy restriction fields
2499                         $dbw->update(
2500                                 'page',
2501                                 array( 'page_restrictions' => '' ),
2502                                 array( 'page_id' => $id ),
2503                                 __METHOD__
2504                         );
2505
2506                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2507                         Hooks::run( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2508                 } else { // Protection of non-existing page (also known as "title protection")
2509                         // Cascade protection is meaningless in this case
2510                         $cascade = false;
2511
2512                         if ( $limit['create'] != '' ) {
2513                                 $dbw->replace( 'protected_titles',
2514                                         array( array( 'pt_namespace', 'pt_title' ) ),
2515                                         array(
2516                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2517                                                 'pt_title' => $this->mTitle->getDBkey(),
2518                                                 'pt_create_perm' => $limit['create'],
2519                                                 'pt_timestamp' => $dbw->timestamp(),
2520                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2521                                                 'pt_user' => $user->getId(),
2522                                                 'pt_reason' => $reason,
2523                                         ), __METHOD__
2524                                 );
2525                         } else {
2526                                 $dbw->delete( 'protected_titles',
2527                                         array(
2528                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2529                                                 'pt_title' => $this->mTitle->getDBkey()
2530                                         ), __METHOD__
2531                                 );
2532                         }
2533                 }
2534
2535                 $this->mTitle->flushRestrictions();
2536                 InfoAction::invalidateCache( $this->mTitle );
2537
2538                 if ( $logAction == 'unprotect' ) {
2539                         $params = array();
2540                 } else {
2541                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2542                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2543                 }
2544
2545                 // Update the protection log
2546                 $log = new LogPage( 'protect' );
2547                 $logId = $log->addEntry( $logAction, $this->mTitle, $reason, $params, $user );
2548                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2549                         $log->addRelations( $logRelationsField, $logRelationsValues, $logId );
2550                 }
2551
2552                 return Status::newGood();
2553         }
2554
2555         /**
2556          * Insert a new null revision for this page.
2557          *
2558          * @param string $revCommentMsg Comment message key for the revision
2559          * @param array $limit Set of restriction keys
2560          * @param array $expiry Per restriction type expiration
2561          * @param int $cascade Set to false if cascading protection isn't allowed.
2562          * @param string $reason
2563          * @param User|null $user
2564          * @return Revision|null Null on error
2565          */
2566         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2567                 array $expiry, $cascade, $reason, $user = null
2568         ) {
2569                 global $wgContLang;
2570                 $dbw = wfGetDB( DB_MASTER );
2571
2572                 // Prepare a null revision to be added to the history
2573                 $editComment = $wgContLang->ucfirst(
2574                         wfMessage(
2575                                 $revCommentMsg,
2576                                 $this->mTitle->getPrefixedText()
2577                         )->inContentLanguage()->text()
2578                 );
2579                 if ( $reason ) {
2580                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2581                 }
2582                 $protectDescription = $this->protectDescription( $limit, $expiry );
2583                 if ( $protectDescription ) {
2584                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2585                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2586                                 ->inContentLanguage()->text();
2587                 }
2588                 if ( $cascade ) {
2589                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2590                         $editComment .= wfMessage( 'brackets' )->params(
2591                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2592                         )->inContentLanguage()->text();
2593                 }
2594
2595                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2596                 if ( $nullRev ) {
2597                         $nullRev->insertOn( $dbw );
2598
2599                         // Update page record and touch page
2600                         $oldLatest = $nullRev->getParentId();
2601                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2602                 }
2603
2604                 return $nullRev;
2605         }
2606
2607         /**
2608          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2609          * @return string
2610          */
2611         protected function formatExpiry( $expiry ) {
2612                 global $wgContLang;
2613                 $dbr = wfGetDB( DB_SLAVE );
2614
2615                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2616                 if ( $encodedExpiry != 'infinity' ) {
2617                         return wfMessage(
2618                                 'protect-expiring',
2619                                 $wgContLang->timeanddate( $expiry, false, false ),
2620                                 $wgContLang->date( $expiry, false, false ),
2621                                 $wgContLang->time( $expiry, false, false )
2622                         )->inContentLanguage()->text();
2623                 } else {
2624                         return wfMessage( 'protect-expiry-indefinite' )
2625                                 ->inContentLanguage()->text();
2626                 }
2627         }
2628
2629         /**
2630          * Builds the description to serve as comment for the edit.
2631          *
2632          * @param array $limit Set of restriction keys
2633          * @param array $expiry Per restriction type expiration
2634          * @return string
2635          */
2636         public function protectDescription( array $limit, array $expiry ) {
2637                 $protectDescription = '';
2638
2639                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2640                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2641                         # All possible message keys are listed here for easier grepping:
2642                         # * restriction-create
2643                         # * restriction-edit
2644                         # * restriction-move
2645                         # * restriction-upload
2646                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2647                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2648                         # with '' filtered out. All possible message keys are listed below:
2649                         # * protect-level-autoconfirmed
2650                         # * protect-level-sysop
2651                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2652
2653                         $expiryText = $this->formatExpiry( $expiry[$action] );
2654
2655                         if ( $protectDescription !== '' ) {
2656                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2657                         }
2658                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2659                                 ->params( $actionText, $restrictionsText, $expiryText )
2660                                 ->inContentLanguage()->text();
2661                 }
2662
2663                 return $protectDescription;
2664         }
2665
2666         /**
2667          * Builds the description to serve as comment for the log entry.
2668          *
2669          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2670          * protect description text. Keep them in old format to avoid breaking compatibility.
2671          * TODO: Fix protection log to store structured description and format it on-the-fly.
2672          *
2673          * @param array $limit Set of restriction keys
2674          * @param array $expiry Per restriction type expiration
2675          * @return string
2676          */
2677         public function protectDescriptionLog( array $limit, array $expiry ) {
2678                 global $wgContLang;
2679
2680                 $protectDescriptionLog = '';
2681
2682                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2683                         $expiryText = $this->formatExpiry( $expiry[$action] );
2684                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2685                 }
2686
2687                 return trim( $protectDescriptionLog );
2688         }
2689
2690         /**
2691          * Take an array of page restrictions and flatten it to a string
2692          * suitable for insertion into the page_restrictions field.
2693          *
2694          * @param string[] $limit
2695          *
2696          * @throws MWException
2697          * @return string
2698          */
2699         protected static function flattenRestrictions( $limit ) {
2700                 if ( !is_array( $limit ) ) {
2701                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2702                 }
2703
2704                 $bits = array();
2705                 ksort( $limit );
2706
2707                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2708                         $bits[] = "$action=$restrictions";
2709                 }
2710
2711                 return implode( ':', $bits );
2712         }
2713
2714         /**
2715          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2716          * backwards compatibility, if you care about error reporting you should use
2717          * doDeleteArticleReal() instead.
2718          *
2719          * Deletes the article with database consistency, writes logs, purges caches
2720          *
2721          * @param string $reason Delete reason for deletion log
2722          * @param bool $suppress Suppress all revisions and log the deletion in
2723          *        the suppression log instead of the deletion log
2724          * @param int $id Article ID
2725          * @param bool $commit Defaults to true, triggers transaction end
2726          * @param array &$error Array of errors to append to
2727          * @param User $user The deleting user
2728          * @return bool True if successful
2729          */
2730         public function doDeleteArticle(
2731                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2732         ) {
2733                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2734                 return $status->isGood();
2735         }
2736
2737         /**
2738          * Back-end article deletion
2739          * Deletes the article with database consistency, writes logs, purges caches
2740          *
2741          * @since 1.19
2742          *
2743          * @param string $reason Delete reason for deletion log
2744          * @param bool $suppress Suppress all revisions and log the deletion in
2745          *   the suppression log instead of the deletion log
2746          * @param int $id Article ID
2747          * @param bool $commit Defaults to true, triggers transaction end
2748          * @param array &$error Array of errors to append to
2749          * @param User $user The deleting user
2750          * @return Status Status object; if successful, $status->value is the log_id of the
2751          *   deletion log entry. If the page couldn't be deleted because it wasn't
2752          *   found, $status is a non-fatal 'cannotdelete' error
2753          */
2754         public function doDeleteArticleReal(
2755                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2756         ) {
2757                 global $wgUser, $wgContentHandlerUseDB;
2758
2759                 wfDebug( __METHOD__ . "\n" );
2760
2761                 $status = Status::newGood();
2762
2763                 if ( $this->mTitle->getDBkey() === '' ) {
2764                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2765                         return $status;
2766                 }
2767
2768                 $user = is_null( $user ) ? $wgUser : $user;
2769                 if ( !Hooks::run( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2770                         if ( $status->isOK() ) {
2771                                 // Hook aborted but didn't set a fatal status
2772                                 $status->fatal( 'delete-hook-aborted' );
2773                         }
2774                         return $status;
2775                 }
2776
2777                 $dbw = wfGetDB( DB_MASTER );
2778                 $dbw->begin( __METHOD__ );
2779
2780                 if ( $id == 0 ) {
2781                         $this->loadPageData( 'forupdate' );
2782                         $id = $this->getID();
2783                         if ( $id == 0 ) {
2784                                 $dbw->rollback( __METHOD__ );
2785                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2786                                 return $status;
2787                         }
2788                 }
2789
2790                 // we need to remember the old content so we can use it to generate all deletion updates.
2791                 $content = $this->getContent( Revision::RAW );
2792
2793                 // Bitfields to further suppress the content
2794                 if ( $suppress ) {
2795                         $bitfield = 0;
2796                         // This should be 15...
2797                         $bitfield |= Revision::DELETED_TEXT;
2798                         $bitfield |= Revision::DELETED_COMMENT;
2799                         $bitfield |= Revision::DELETED_USER;
2800                         $bitfield |= Revision::DELETED_RESTRICTED;
2801                 } else {
2802                         $bitfield = 'rev_deleted';
2803                 }
2804
2805                 // For now, shunt the revision data into the archive table.
2806                 // Text is *not* removed from the text table; bulk storage
2807                 // is left intact to avoid breaking block-compression or
2808                 // immutable storage schemes.
2809                 //
2810                 // For backwards compatibility, note that some older archive
2811                 // table entries will have ar_text and ar_flags fields still.
2812                 //
2813                 // In the future, we may keep revisions and mark them with
2814                 // the rev_deleted field, which is reserved for this purpose.
2815
2816                 $row = array(
2817                         'ar_namespace'  => 'page_namespace',
2818                         'ar_title'      => 'page_title',
2819                         'ar_comment'    => 'rev_comment',
2820                         'ar_user'       => 'rev_user',
2821                         'ar_user_text'  => 'rev_user_text',
2822                         'ar_timestamp'  => 'rev_timestamp',
2823                         'ar_minor_edit' => 'rev_minor_edit',
2824                         'ar_rev_id'     => 'rev_id',
2825                         'ar_parent_id'  => 'rev_parent_id',
2826                         'ar_text_id'    => 'rev_text_id',
2827                         'ar_text'       => '\'\'', // Be explicit to appease
2828                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2829                         'ar_len'        => 'rev_len',
2830                         'ar_page_id'    => 'page_id',
2831                         'ar_deleted'    => $bitfield,
2832                         'ar_sha1'       => 'rev_sha1',
2833                 );
2834
2835                 if ( $wgContentHandlerUseDB ) {
2836                         $row['ar_content_model'] = 'rev_content_model';
2837                         $row['ar_content_format'] = 'rev_content_format';
2838                 }
2839
2840                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2841                         $row,
2842                         array(
2843                                 'page_id' => $id,
2844                                 'page_id = rev_page'
2845                         ), __METHOD__
2846                 );
2847
2848                 // Now that it's safely backed up, delete it
2849                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2850                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2851
2852                 if ( !$ok ) {
2853                         $dbw->rollback( __METHOD__ );
2854                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2855                         return $status;
2856                 }
2857
2858                 if ( !$dbw->cascadingDeletes() ) {
2859                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2860                 }
2861
2862                 // Clone the title, so we have the information we need when we log
2863                 $logTitle = clone $this->mTitle;
2864
2865                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2866                 $logtype = $suppress ? 'suppress' : 'delete';
2867
2868                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2869                 $logEntry->setPerformer( $user );
2870                 $logEntry->setTarget( $logTitle );
2871                 $logEntry->setComment( $reason );
2872                 $logid = $logEntry->insert();
2873
2874                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
2875                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2876                         $logEntry->publish( $logid );
2877                 } );
2878
2879                 if ( $commit ) {
2880                         $dbw->commit( __METHOD__ );
2881                 }
2882
2883                 $this->doDeleteUpdates( $id, $content );
2884
2885                 Hooks::run( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2886                 $status->value = $logid;
2887                 return $status;
2888         }
2889
2890         /**
2891          * Do some database updates after deletion
2892          *
2893          * @param int $id The page_id value of the page being deleted
2894          * @param Content $content Optional page content to be used when determining
2895          *   the required updates. This may be needed because $this->getContent()
2896          *   may already return null when the page proper was deleted.
2897          */
2898         public function doDeleteUpdates( $id, Content $content = null ) {
2899                 // update site status
2900                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2901
2902                 // remove secondary indexes, etc
2903                 $updates = $this->getDeletionUpdates( $content );
2904                 DataUpdate::runUpdates( $updates );
2905
2906                 // Reparse any pages transcluding this page
2907                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2908
2909                 // Reparse any pages including this image
2910                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2911                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2912                 }
2913
2914                 // Clear caches
2915                 WikiPage::onArticleDelete( $this->mTitle );
2916
2917                 // Reset this object and the Title object
2918                 $this->loadFromRow( false, self::READ_LATEST );
2919
2920                 // Search engine
2921                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2922         }
2923
2924         /**
2925          * Roll back the most recent consecutive set of edits to a page
2926          * from the same user; fails if there are no eligible edits to
2927          * roll back to, e.g. user is the sole contributor. This function
2928          * performs permissions checks on $user, then calls commitRollback()
2929          * to do the dirty work
2930          *
2931          * @todo Separate the business/permission stuff out from backend code
2932          *
2933          * @param string $fromP Name of the user whose edits to rollback.
2934          * @param string $summary Custom summary. Set to default summary if empty.
2935          * @param string $token Rollback token.
2936          * @param bool $bot If true, mark all reverted edits as bot.
2937          *
2938          * @param array $resultDetails Array contains result-specific array of additional values
2939          *    'alreadyrolled' : 'current' (rev)
2940          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2941          *
2942          * @param User $user The user performing the rollback
2943          * @return array Array of errors, each error formatted as
2944          *   array(messagekey, param1, param2, ...).
2945          * On success, the array is empty.  This array can also be passed to
2946          * OutputPage::showPermissionsErrorPage().
2947          */
2948         public function doRollback(
2949                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2950         ) {
2951                 $resultDetails = null;
2952
2953                 // Check permissions
2954                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2955                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2956                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2957
2958                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2959                         $errors[] = array( 'sessionfailure' );
2960                 }
2961
2962                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2963                         $errors[] = array( 'actionthrottledtext' );
2964                 }
2965
2966                 // If there were errors, bail out now
2967                 if ( !empty( $errors ) ) {
2968                         return $errors;
2969                 }
2970
2971                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2972         }
2973
2974         /**
2975          * Backend implementation of doRollback(), please refer there for parameter
2976          * and return value documentation
2977          *
2978          * NOTE: This function does NOT check ANY permissions, it just commits the
2979          * rollback to the DB. Therefore, you should only call this function direct-
2980          * ly if you want to use custom permissions checks. If you don't, use
2981          * doRollback() instead.
2982          * @param string $fromP Name of the user whose edits to rollback.
2983          * @param string $summary Custom summary. Set to default summary if empty.
2984          * @param bool $bot If true, mark all reverted edits as bot.
2985          *
2986          * @param array $resultDetails Contains result-specific array of additional values
2987          * @param User $guser The user performing the rollback
2988          * @return array
2989          */
2990         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2991                 global $wgUseRCPatrol, $wgContLang;
2992
2993                 $dbw = wfGetDB( DB_MASTER );
2994
2995                 if ( wfReadOnly() ) {
2996                         return array( array( 'readonlytext' ) );
2997                 }
2998
2999                 // Get the last editor
3000                 $current = $this->getRevision();
3001                 if ( is_null( $current ) ) {
3002                         // Something wrong... no page?
3003                         return array( array( 'notanarticle' ) );
3004                 }
3005
3006                 $from = str_replace( '_', ' ', $fromP );
3007                 // User name given should match up with the top revision.
3008                 // If the user was deleted then $from should be empty.
3009                 if ( $from != $current->getUserText() ) {
3010                         $resultDetails = array( 'current' => $current );
3011                         return array( array( 'alreadyrolled',
3012                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3013                                 htmlspecialchars( $fromP ),
3014                                 htmlspecialchars( $current->getUserText() )
3015                         ) );
3016                 }
3017
3018                 // Get the last edit not by this guy...
3019                 // Note: these may not be public values
3020                 $user = intval( $current->getUser( Revision::RAW ) );
3021                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3022                 $s = $dbw->selectRow( 'revision',
3023                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3024                         array( 'rev_page' => $current->getPage(),
3025                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3026                         ), __METHOD__,
3027                         array( 'USE INDEX' => 'page_timestamp',
3028                                 'ORDER BY' => 'rev_timestamp DESC' )
3029                         );
3030                 if ( $s === false ) {
3031                         // No one else ever edited this page
3032                         return array( array( 'cantrollback' ) );
3033                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3034                         || $s->rev_deleted & Revision::DELETED_USER
3035                 ) {
3036                         // Only admins can see this text
3037                         return array( array( 'notvisiblerev' ) );
3038                 }
3039
3040                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3041                 // This is done before the rollback edit to have patrolling also on failure (bug 62157).
3042                 $set = array();
3043                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3044                         // Mark all reverted edits as bot
3045                         $set['rc_bot'] = 1;
3046                 }
3047
3048                 if ( $wgUseRCPatrol ) {
3049                         // Mark all reverted edits as patrolled
3050                         $set['rc_patrolled'] = 1;
3051                 }
3052
3053                 if ( count( $set ) ) {
3054                         $dbw->update( 'recentchanges', $set,
3055                                 array( /* WHERE */
3056                                         'rc_cur_id' => $current->getPage(),
3057                                         'rc_user_text' => $current->getUserText(),
3058                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3059                                 ), __METHOD__
3060                         );
3061                 }
3062
3063                 // Generate the edit summary if necessary
3064                 $target = Revision::newFromId( $s->rev_id );
3065                 if ( empty( $summary ) ) {
3066                         if ( $from == '' ) { // no public user name
3067                                 $summary = wfMessage( 'revertpage-nouser' );
3068                         } else {
3069                                 $summary = wfMessage( 'revertpage' );
3070                         }
3071                 }
3072
3073                 // Allow the custom summary to use the same args as the default message
3074                 $args = array(
3075                         $target->getUserText(), $from, $s->rev_id,
3076                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3077                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3078                 );
3079                 if ( $summary instanceof Message ) {
3080                         $summary = $summary->params( $args )->inContentLanguage()->text();
3081                 } else {
3082                         $summary = wfMsgReplaceArgs( $summary, $args );
3083                 }
3084
3085                 // Trim spaces on user supplied text
3086                 $summary = trim( $summary );
3087
3088                 // Truncate for whole multibyte characters.
3089                 $summary = $wgContLang->truncate( $summary, 255 );
3090
3091                 // Save
3092                 $flags = EDIT_UPDATE;
3093
3094                 if ( $guser->isAllowed( 'minoredit' ) ) {
3095                         $flags |= EDIT_MINOR;
3096                 }
3097
3098                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3099                         $flags |= EDIT_FORCE_BOT;
3100                 }
3101
3102                 // Actually store the edit
3103                 $status = $this->doEditContent(
3104                         $target->getContent(),
3105                         $summary,
3106                         $flags,
3107                         $target->getId(),
3108                         $guser
3109                 );
3110
3111                 if ( !$status->isOK() ) {
3112                         return $status->getErrorsArray();
3113                 }
3114
3115                 // raise error, when the edit is an edit without a new version
3116                 if ( empty( $status->value['revision'] ) ) {
3117                         $resultDetails = array( 'current' => $current );
3118                         return array( array( 'alreadyrolled',
3119                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3120                                         htmlspecialchars( $fromP ),
3121                                         htmlspecialchars( $current->getUserText() )
3122                         ) );
3123                 }
3124
3125                 $revId = $status->value['revision']->getId();
3126
3127                 Hooks::run( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
3128
3129                 $resultDetails = array(
3130                         'summary' => $summary,
3131                         'current' => $current,
3132                         'target' => $target,
3133                         'newid' => $revId
3134                 );
3135
3136                 return array();
3137         }
3138
3139         /**
3140          * The onArticle*() functions are supposed to be a kind of hooks
3141          * which should be called whenever any of the specified actions
3142          * are done.
3143          *
3144          * This is a good place to put code to clear caches, for instance.
3145          *
3146          * This is called on page move and undelete, as well as edit
3147          *
3148          * @param Title $title
3149          */
3150         public static function onArticleCreate( Title $title ) {
3151                 // Update existence markers on article/talk tabs...
3152                 $other = $title->getOtherPage();
3153
3154                 $other->invalidateCache();
3155                 $other->purgeSquid();
3156
3157                 $title->touchLinks();
3158                 $title->purgeSquid();
3159                 $title->deleteTitleProtection();
3160         }
3161
3162         /**
3163          * Clears caches when article is deleted
3164          *
3165          * @param Title $title
3166          */
3167         public static function onArticleDelete( Title $title ) {
3168                 // Update existence markers on article/talk tabs...
3169                 $other = $title->getOtherPage();
3170
3171                 $other->invalidateCache();
3172                 $other->purgeSquid();
3173
3174                 $title->touchLinks();
3175                 $title->purgeSquid();
3176
3177                 // File cache
3178                 HTMLFileCache::clearFileCache( $title );
3179                 InfoAction::invalidateCache( $title );
3180
3181                 // Messages
3182                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3183                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3184                 }
3185
3186                 // Images
3187                 if ( $title->getNamespace() == NS_FILE ) {
3188                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3189                         $update->doUpdate();
3190                 }
3191
3192                 // User talk pages
3193                 if ( $title->getNamespace() == NS_USER_TALK ) {
3194                         $user = User::newFromName( $title->getText(), false );
3195                         if ( $user ) {
3196                                 $user->setNewtalk( false );
3197                         }
3198                 }
3199
3200                 // Image redirects
3201                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3202         }
3203
3204         /**
3205          * Purge caches on page update etc
3206          *
3207          * @param Title $title
3208          */
3209         public static function onArticleEdit( Title $title ) {
3210                 // Invalidate caches of articles which include this page
3211                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3212
3213                 // Invalidate the caches of all pages which redirect here
3214                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3215
3216                 // Purge squid for this page only
3217                 $title->purgeSquid();
3218
3219                 // Clear file cache for this page only
3220                 HTMLFileCache::clearFileCache( $title );
3221                 InfoAction::invalidateCache( $title );
3222         }
3223
3224         /**#@-*/
3225
3226         /**
3227          * Returns a list of categories this page is a member of.
3228          * Results will include hidden categories
3229          *
3230          * @return TitleArray
3231          */
3232         public function getCategories() {
3233                 $id = $this->getId();
3234                 if ( $id == 0 ) {
3235                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3236                 }
3237
3238                 $dbr = wfGetDB( DB_SLAVE );
3239                 $res = $dbr->select( 'categorylinks',
3240                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3241                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3242                         // as not being aliases, and NS_CATEGORY is numeric
3243                         array( 'cl_from' => $id ),
3244                         __METHOD__ );
3245
3246                 return TitleArray::newFromResult( $res );
3247         }
3248
3249         /**
3250          * Returns a list of hidden categories this page is a member of.
3251          * Uses the page_props and categorylinks tables.
3252          *
3253          * @return array Array of Title objects
3254          */
3255         public function getHiddenCategories() {
3256                 $result = array();
3257                 $id = $this->getId();
3258
3259                 if ( $id == 0 ) {
3260                         return array();
3261                 }
3262
3263                 $dbr = wfGetDB( DB_SLAVE );
3264                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3265                         array( 'cl_to' ),
3266                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3267                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3268                         __METHOD__ );
3269
3270                 if ( $res !== false ) {
3271                         foreach ( $res as $row ) {
3272                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3273                         }
3274                 }
3275
3276                 return $result;
3277         }
3278
3279         /**
3280          * Return an applicable autosummary if one exists for the given edit.
3281          * @param string|null $oldtext The previous text of the page.
3282          * @param string|null $newtext The submitted text of the page.
3283          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3284          * @return string An appropriate autosummary, or an empty string.
3285          *
3286          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3287          */
3288         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3289                 // NOTE: stub for backwards-compatibility. assumes the given text is
3290                 // wikitext. will break horribly if it isn't.
3291
3292                 ContentHandler::deprecated( __METHOD__, '1.21' );
3293
3294                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3295                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3296                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3297
3298                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3299         }
3300
3301         /**
3302          * Auto-generates a deletion reason
3303          *
3304          * @param bool &$hasHistory Whether the page has a history
3305          * @return string|bool String containing deletion reason or empty string, or boolean false
3306          *    if no revision occurred
3307          */
3308         public function getAutoDeleteReason( &$hasHistory ) {
3309                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3310         }
3311
3312         /**
3313          * Update all the appropriate counts in the category table, given that
3314          * we've added the categories $added and deleted the categories $deleted.
3315          *
3316          * @param array $added The names of categories that were added
3317          * @param array $deleted The names of categories that were deleted
3318          */
3319         public function updateCategoryCounts( array $added, array $deleted ) {
3320                 $that = $this;
3321                 $method = __METHOD__;
3322                 $dbw = wfGetDB( DB_MASTER );
3323
3324                 // Do this at the end of the commit to reduce lock wait timeouts
3325                 $dbw->onTransactionPreCommitOrIdle(
3326                         function () use ( $dbw, $that, $method, $added, $deleted ) {
3327                                 $ns = $that->getTitle()->getNamespace();
3328
3329                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3330                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3331                                 if ( $ns == NS_CATEGORY ) {
3332                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3333                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3334                                 } elseif ( $ns == NS_FILE ) {
3335                                         $addFields[] = 'cat_files = cat_files + 1';
3336                                         $removeFields[] = 'cat_files = cat_files - 1';
3337                                 }
3338
3339                                 if ( count( $added ) ) {
3340                                         $insertRows = array();
3341                                         foreach ( $added as $cat ) {
3342                                                 $insertRows[] = array(
3343                                                         'cat_title'   => $cat,
3344                                                         'cat_pages'   => 1,
3345                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3346                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3347                                                 );
3348                                         }
3349                                         $dbw->upsert(
3350                                                 'category',
3351                                                 $insertRows,
3352                                                 array( 'cat_title' ),
3353                                                 $addFields,
3354                                                 $method
3355                                         );
3356                                 }
3357
3358                                 if ( count( $deleted ) ) {
3359                                         $dbw->update(
3360                                                 'category',
3361                                                 $removeFields,
3362                                                 array( 'cat_title' => $deleted ),
3363                                                 $method
3364                                         );
3365                                 }
3366
3367                                 foreach ( $added as $catName ) {
3368                                         $cat = Category::newFromName( $catName );
3369                                         Hooks::run( 'CategoryAfterPageAdded', array( $cat, $that ) );
3370                                 }
3371
3372                                 foreach ( $deleted as $catName ) {
3373                                         $cat = Category::newFromName( $catName );
3374                                         Hooks::run( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3375                                 }
3376                         }
3377                 );
3378         }
3379
3380         /**
3381          * Updates cascading protections
3382          *
3383          * @param ParserOutput $parserOutput ParserOutput object for the current version
3384          */
3385         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3386                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3387                         return;
3388                 }
3389
3390                 // templatelinks or imagelinks tables may have become out of sync,
3391                 // especially if using variable-based transclusions.
3392                 // For paranoia, check if things have changed and if
3393                 // so apply updates to the database. This will ensure
3394                 // that cascaded protections apply as soon as the changes
3395                 // are visible.
3396
3397                 // Get templates from templatelinks and images from imagelinks
3398                 $id = $this->getId();
3399
3400                 $dbLinks = array();
3401
3402                 $dbr = wfGetDB( DB_SLAVE );
3403                 $res = $dbr->select( array( 'templatelinks' ),
3404                         array( 'tl_namespace', 'tl_title' ),
3405                         array( 'tl_from' => $id ),
3406                         __METHOD__
3407                 );
3408
3409                 foreach ( $res as $row ) {
3410                         $dbLinks["{$row->tl_namespace}:{$row->tl_title}"] = true;
3411                 }
3412
3413                 $dbr = wfGetDB( DB_SLAVE );
3414                 $res = $dbr->select( array( 'imagelinks' ),
3415                         array( 'il_to' ),
3416                         array( 'il_from' => $id ),
3417                         __METHOD__
3418                 );
3419
3420                 foreach ( $res as $row ) {
3421                         $dbLinks[NS_FILE . ":{$row->il_to}"] = true;
3422                 }
3423
3424                 // Get templates and images from parser output.
3425                 $poLinks = array();
3426                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3427                         foreach ( $templates as $dbk => $id ) {
3428                                 $poLinks["$ns:$dbk"] = true;
3429                         }
3430                 }
3431                 foreach ( $parserOutput->getImages() as $dbk => $id ) {
3432                         $poLinks[NS_FILE . ":$dbk"] = true;
3433                 }
3434
3435                 // Get the diff
3436                 $links_diff = array_diff_key( $poLinks, $dbLinks );
3437
3438                 if ( count( $links_diff ) > 0 ) {
3439                         // Whee, link updates time.
3440                         // Note: we are only interested in links here. We don't need to get
3441                         // other DataUpdate items from the parser output.
3442                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3443                         $u->doUpdate();
3444                 }
3445         }
3446
3447         /**
3448          * Return a list of templates used by this article.
3449          * Uses the templatelinks table
3450          *
3451          * @deprecated since 1.19; use Title::getTemplateLinksFrom()
3452          * @return array Array of Title objects
3453          */
3454         public function getUsedTemplates() {
3455                 return $this->mTitle->getTemplateLinksFrom();
3456         }
3457
3458         /**
3459          * This function is called right before saving the wikitext,
3460          * so we can do things like signatures and links-in-context.
3461          *
3462          * @deprecated since 1.19; use Parser::preSaveTransform() instead
3463          * @param string $text Article contents
3464          * @param User $user User doing the edit
3465          * @param ParserOptions $popts Parser options, default options for
3466          *   the user loaded if null given
3467          * @return string Article contents with altered wikitext markup (signatures
3468          *      converted, {{subst:}}, templates, etc.)
3469          */
3470         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3471                 global $wgParser, $wgUser;
3472
3473                 wfDeprecated( __METHOD__, '1.19' );
3474
3475                 $user = is_null( $user ) ? $wgUser : $user;
3476
3477                 if ( $popts === null ) {
3478                         $popts = ParserOptions::newFromUser( $user );
3479                 }
3480
3481                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3482         }
3483
3484         /**
3485          * Update the article's restriction field, and leave a log entry.
3486          *
3487          * @deprecated since 1.19
3488          * @param array $limit Set of restriction keys
3489          * @param string $reason
3490          * @param int &$cascade Set to false if cascading protection isn't allowed.
3491          * @param array $expiry Per restriction type expiration
3492          * @param User $user The user updating the restrictions
3493          * @return bool True on success
3494          */
3495         public function updateRestrictions(
3496                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3497         ) {
3498                 global $wgUser;
3499
3500                 $user = is_null( $user ) ? $wgUser : $user;
3501
3502                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3503         }
3504
3505         /**
3506          * Returns a list of updates to be performed when this page is deleted. The
3507          * updates should remove any information about this page from secondary data
3508          * stores such as links tables.
3509          *
3510          * @param Content|null $content Optional Content object for determining the
3511          *   necessary updates.
3512          * @return array An array of DataUpdates objects
3513          */
3514         public function getDeletionUpdates( Content $content = null ) {
3515                 if ( !$content ) {
3516                         // load content object, which may be used to determine the necessary updates
3517                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3518                         $content = $this->getContent( Revision::RAW );
3519                 }
3520
3521                 if ( !$content ) {
3522                         $updates = array();
3523                 } else {
3524                         $updates = $content->getDeletionUpdates( $this );
3525                 }
3526
3527                 Hooks::run( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3528                 return $updates;
3529         }
3530 }