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 class WikiPage implements Page, IDBAccessObject {
  36         // Constants for $mDataLoadedFrom and related
  37
  38         /**
  39          * @var Title
  40          */
  41         public $mTitle = null;
  42
  43         /**@{{
  44          * @protected
  45          */
  46         public $mDataLoaded = false;         // !< Boolean
  47         public $mIsRedirect = false;         // !< Boolean
  48         public $mLatest = false;             // !< Integer (false means "not loaded")
  49         /**@}}*/
  50
  51         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  52         public $mPreparedEdit = false;
  53
  54         /**
  55          * @var int
  56          */
  57         protected $mId = null;
  58
  59         /**
  60          * @var int One of the READ_* constants
  61          */
  62         protected $mDataLoadedFrom = self::READ_NONE;
  63
  64         /**
  65          * @var Title
  66          */
  67         protected $mRedirectTarget = null;
  68
  69         /**
  70          * @var Revision
  71          */
  72         protected $mLastRevision = null;
  73
  74         /**
  75          * @var string Timestamp of the current revision or empty string if not loaded
  76          */
  77         protected $mTimestamp = '';
  78
  79         /**
  80          * @var string
  81          */
  82         protected $mTouched = '19700101000000';
  83
  84         /**
  85          * @var string
  86          */
  87         protected $mLinksUpdated = '19700101000000';
  88
  89         /**
  90          * Constructor and clear the article
  91          * @param Title $title Reference to a Title object.
  92          */
  93         public function __construct( Title $title ) {
  94                 $this->mTitle = $title;
  95         }
  96
  97         /**
  98          * Create a WikiPage object of the appropriate class for the given title.
  99          *
 100          * @param Title $title
 101          *
 102          * @throws MWException
 103          * @return WikiPage Object of the appropriate type
 104          */
 105         public static function factory( Title $title ) {
 106                 $ns = $title->getNamespace();
 107
 108                 if ( $ns == NS_MEDIA ) {
 109                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 110                 } elseif ( $ns < 0 ) {
 111                         throw new MWException( "Invalid or virtual namespace $ns given." );
 112                 }
 113
 114                 switch ( $ns ) {
 115                         case NS_FILE:
 116                                 $page = new WikiFilePage( $title );
 117                                 break;
 118                         case NS_CATEGORY:
 119                                 $page = new WikiCategoryPage( $title );
 120                                 break;
 121                         default:
 122                                 $page = new WikiPage( $title );
 123                 }
 124
 125                 return $page;
 126         }
 127
 128         /**
 129          * Constructor from a page id
 130          *
 131          * @param int $id Article ID to load
 132          * @param string|int $from One of the following values:
 133          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 134          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 135          *
 136          * @return WikiPage|null
 137          */
 138         public static function newFromID( $id, $from = 'fromdb' ) {
 139                 // page id's are never 0 or negative, see bug 61166
 140                 if ( $id < 1 ) {
 141                         return null;
 142                 }
 143
 144                 $from = self::convertSelectType( $from );
 145                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 146                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 147                 if ( !$row ) {
 148                         return null;
 149                 }
 150                 return self::newFromRow( $row, $from );
 151         }
 152
 153         /**
 154          * Constructor from a database row
 155          *
 156          * @since 1.20
 157          * @param object $row Database row containing at least fields returned by selectFields().
 158          * @param string|int $from Source of $data:
 159          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 160          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 161          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 162          * @return WikiPage
 163          */
 164         public static function newFromRow( $row, $from = 'fromdb' ) {
 165                 $page = self::factory( Title::newFromRow( $row ) );
 166                 $page->loadFromRow( $row, $from );
 167                 return $page;
 168         }
 169
 170         /**
 171          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 172          *
 173          * @param object|string|int $type
 174          * @return mixed
 175          */
 176         private static function convertSelectType( $type ) {
 177                 switch ( $type ) {
 178                 case 'fromdb':
 179                         return self::READ_NORMAL;
 180                 case 'fromdbmaster':
 181                         return self::READ_LATEST;
 182                 case 'forupdate':
 183                         return self::READ_LOCKING;
 184                 default:
 185                         // It may already be an integer or whatever else
 186                         return $type;
 187                 }
 188         }
 189
 190         /**
 191          * Returns overrides for action handlers.
 192          * Classes listed here will be used instead of the default one when
 193          * (and only when) $wgActions[$action] === true. This allows subclasses
 194          * to override the default behavior.
 195          *
 196          * @todo Move this UI stuff somewhere else
 197          *
 198          * @return array
 199          */
 200         public function getActionOverrides() {
 201                 $content_handler = $this->getContentHandler();
 202                 return $content_handler->getActionOverrides();
 203         }
 204
 205         /**
 206          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 207          *
 208          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 209          *
 210          * @return ContentHandler
 211          *
 212          * @since 1.21
 213          */
 214         public function getContentHandler() {
 215                 return ContentHandler::getForModelID( $this->getContentModel() );
 216         }
 217
 218         /**
 219          * Get the title object of the article
 220          * @return Title Title object of this page
 221          */
 222         public function getTitle() {
 223                 return $this->mTitle;
 224         }
 225
 226         /**
 227          * Clear the object
 228          * @return void
 229          */
 230         public function clear() {
 231                 $this->mDataLoaded = false;
 232                 $this->mDataLoadedFrom = self::READ_NONE;
 233
 234                 $this->clearCacheFields();
 235         }
 236
 237         /**
 238          * Clear the object cache fields
 239          * @return void
 240          */
 241         protected function clearCacheFields() {
 242                 $this->mId = null;
 243                 $this->mRedirectTarget = null; // Title object if set
 244                 $this->mLastRevision = null; // Latest revision
 245                 $this->mTouched = '19700101000000';
 246                 $this->mLinksUpdated = '19700101000000';
 247                 $this->mTimestamp = '';
 248                 $this->mIsRedirect = false;
 249                 $this->mLatest = false;
 250                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 251                 // the requested rev ID and content against the cached one for equality. For most
 252                 // content types, the output should not change during the lifetime of this cache.
 253                 // Clearing it can cause extra parses on edit for no reason.
 254         }
 255
 256         /**
 257          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 258          * @return void
 259          * @since 1.23
 260          */
 261         public function clearPreparedEdit() {
 262                 $this->mPreparedEdit = false;
 263         }
 264
 265         /**
 266          * Return the list of revision fields that should be selected to create
 267          * a new page.
 268          *
 269          * @return array
 270          */
 271         public static function selectFields() {
 272                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 273
 274                 $fields = array(
 275                         'page_id',
 276                         'page_namespace',
 277                         'page_title',
 278                         'page_restrictions',
 279                         'page_is_redirect',
 280                         'page_is_new',
 281                         'page_random',
 282                         'page_touched',
 283                         'page_links_updated',
 284                         'page_latest',
 285                         'page_len',
 286                 );
 287
 288                 if ( $wgContentHandlerUseDB ) {
 289                         $fields[] = 'page_content_model';
 290                 }
 291
 292                 if ( $wgPageLanguageUseDB ) {
 293                         $fields[] = 'page_lang';
 294                 }
 295
 296                 return $fields;
 297         }
 298
 299         /**
 300          * Fetch a page record with the given conditions
 301          * @param DatabaseBase $dbr
 302          * @param array $conditions
 303          * @param array $options
 304          * @return object|bool Database result resource, or false on failure
 305          */
 306         protected function pageData( $dbr, $conditions, $options = array() ) {
 307                 $fields = self::selectFields();
 308
 309                 Hooks::run( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 310
 311                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 312
 313                 Hooks::run( 'ArticlePageDataAfter', array( &$this, &$row ) );
 314
 315                 return $row;
 316         }
 317
 318         /**
 319          * Fetch a page record matching the Title object's namespace and title
 320          * using a sanitized title string
 321          *
 322          * @param DatabaseBase $dbr
 323          * @param Title $title
 324          * @param array $options
 325          * @return object|bool Database result resource, or false on failure
 326          */
 327         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 328                 return $this->pageData( $dbr, array(
 329                         'page_namespace' => $title->getNamespace(),
 330                         'page_title' => $title->getDBkey() ), $options );
 331         }
 332
 333         /**
 334          * Fetch a page record matching the requested ID
 335          *
 336          * @param DatabaseBase $dbr
 337          * @param int $id
 338          * @param array $options
 339          * @return object|bool Database result resource, or false on failure
 340          */
 341         public function pageDataFromId( $dbr, $id, $options = array() ) {
 342                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 343         }
 344
 345         /**
 346          * Load the object from a given source by title
 347          *
 348          * @param object|string|int $from One of the following:
 349          *   - A DB query result object.
 350          *   - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB.
 351          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 352          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 353          *     using SELECT FOR UPDATE.
 354          *
 355          * @return void
 356          */
 357         public function loadPageData( $from = 'fromdb' ) {
 358                 $from = self::convertSelectType( $from );
 359                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 360                         // We already have the data from the correct location, no need to load it twice.
 361                         return;
 362                 }
 363
 364                 if ( $from === self::READ_LOCKING ) {
 365                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 366                 } elseif ( $from === self::READ_LATEST ) {
 367                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 368                 } elseif ( $from === self::READ_NORMAL ) {
 369                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 370                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 371                         // Note that DB also stores the master position in the session and checks it.
 372                         $touched = $this->getCachedLastEditTime();
 373                         if ( $touched ) { // key set
 374                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 375                                         $from = self::READ_LATEST;
 376                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 377                                 }
 378                         }
 379                 } else {
 380                         // No idea from where the caller got this data, assume slave database.
 381                         $data = $from;
 382                         $from = self::READ_NORMAL;
 383                 }
 384
 385                 $this->loadFromRow( $data, $from );
 386         }
 387
 388         /**
 389          * Load the object from a database row
 390          *
 391          * @since 1.20
 392          * @param object $data Database row containing at least fields returned by selectFields()
 393          * @param string|int $from One of the following:
 394          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 395          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 396          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 397          *          the master DB using SELECT FOR UPDATE
 398          */
 399         public function loadFromRow( $data, $from ) {
 400                 $lc = LinkCache::singleton();
 401                 $lc->clearLink( $this->mTitle );
 402
 403                 if ( $data ) {
 404                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 405
 406                         $this->mTitle->loadFromRow( $data );
 407
 408                         // Old-fashioned restrictions
 409                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 410
 411                         $this->mId = intval( $data->page_id );
 412                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 413                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 414                         $this->mIsRedirect = intval( $data->page_is_redirect );
 415                         $this->mLatest = intval( $data->page_latest );
 416                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 417                         // Double-check the ID of any cached latest Revision object for consistency.
 418                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 419                                 $this->mLastRevision = null;
 420                                 $this->mTimestamp = '';
 421                         }
 422                 } else {
 423                         $lc->addBadLinkObj( $this->mTitle );
 424
 425                         $this->mTitle->loadFromRow( false );
 426
 427                         $this->clearCacheFields();
 428
 429                         $this->mId = 0;
 430                 }
 431
 432                 $this->mDataLoaded = true;
 433                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 434         }
 435
 436         /**
 437          * @return int Page ID
 438          */
 439         public function getId() {
 440                 if ( !$this->mDataLoaded ) {
 441                         $this->loadPageData();
 442                 }
 443                 return $this->mId;
 444         }
 445
 446         /**
 447          * @return bool Whether or not the page exists in the database
 448          */
 449         public function exists() {
 450                 if ( !$this->mDataLoaded ) {
 451                         $this->loadPageData();
 452                 }
 453                 return $this->mId > 0;
 454         }
 455
 456         /**
 457          * Check if this page is something we're going to be showing
 458          * some sort of sensible content for. If we return false, page
 459          * views (plain action=view) will return an HTTP 404 response,
 460          * so spiders and robots can know they're following a bad link.
 461          *
 462          * @return bool
 463          */
 464         public function hasViewableContent() {
 465                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 466         }
 467
 468         /**
 469          * Tests if the article content represents a redirect
 470          *
 471          * @return bool
 472          */
 473         public function isRedirect() {
 474                 $content = $this->getContent();
 475                 if ( !$content ) {
 476                         return false;
 477                 }
 478
 479                 return $content->isRedirect();
 480         }
 481
 482         /**
 483          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 484          *
 485          * Will use the revisions actual content model if the page exists,
 486          * and the page's default if the page doesn't exist yet.
 487          *
 488          * @return string
 489          *
 490          * @since 1.21
 491          */
 492         public function getContentModel() {
 493                 if ( $this->exists() ) {
 494                         // look at the revision's actual content model
 495                         $rev = $this->getRevision();
 496
 497                         if ( $rev !== null ) {
 498                                 return $rev->getContentModel();
 499                         } else {
 500                                 $title = $this->mTitle->getPrefixedDBkey();
 501                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 502                         }
 503                 }
 504
 505                 // use the default model for this page
 506                 return $this->mTitle->getContentModel();
 507         }
 508
 509         /**
 510          * Loads page_touched and returns a value indicating if it should be used
 511          * @return bool True if not a redirect
 512          */
 513         public function checkTouched() {
 514                 if ( !$this->mDataLoaded ) {
 515                         $this->loadPageData();
 516                 }
 517                 return !$this->mIsRedirect;
 518         }
 519
 520         /**
 521          * Get the page_touched field
 522          * @return string Containing GMT timestamp
 523          */
 524         public function getTouched() {
 525                 if ( !$this->mDataLoaded ) {
 526                         $this->loadPageData();
 527                 }
 528                 return $this->mTouched;
 529         }
 530
 531         /**
 532          * Get the page_links_updated field
 533          * @return string|null Containing GMT timestamp
 534          */
 535         public function getLinksTimestamp() {
 536                 if ( !$this->mDataLoaded ) {
 537                         $this->loadPageData();
 538                 }
 539                 return $this->mLinksUpdated;
 540         }
 541
 542         /**
 543          * Get the page_latest field
 544          * @return int The rev_id of current revision
 545          */
 546         public function getLatest() {
 547                 if ( !$this->mDataLoaded ) {
 548                         $this->loadPageData();
 549                 }
 550                 return (int)$this->mLatest;
 551         }
 552
 553         /**
 554          * Get the Revision object of the oldest revision
 555          * @return Revision|null
 556          */
 557         public function getOldestRevision() {
 558
 559                 // Try using the slave database first, then try the master
 560                 $continue = 2;
 561                 $db = wfGetDB( DB_SLAVE );
 562                 $revSelectFields = Revision::selectFields();
 563
 564                 $row = null;
 565                 while ( $continue ) {
 566                         $row = $db->selectRow(
 567                                 array( 'page', 'revision' ),
 568                                 $revSelectFields,
 569                                 array(
 570                                         'page_namespace' => $this->mTitle->getNamespace(),
 571                                         'page_title' => $this->mTitle->getDBkey(),
 572                                         'rev_page = page_id'
 573                                 ),
 574                                 __METHOD__,
 575                                 array(
 576                                         'ORDER BY' => 'rev_timestamp ASC'
 577                                 )
 578                         );
 579
 580                         if ( $row ) {
 581                                 $continue = 0;
 582                         } else {
 583                                 $db = wfGetDB( DB_MASTER );
 584                                 $continue--;
 585                         }
 586                 }
 587
 588                 return $row ? Revision::newFromRow( $row ) : null;
 589         }
 590
 591         /**
 592          * Loads everything except the text
 593          * This isn't necessary for all uses, so it's only done if needed.
 594          */
 595         protected function loadLastEdit() {
 596                 if ( $this->mLastRevision !== null ) {
 597                         return; // already loaded
 598                 }
 599
 600                 $latest = $this->getLatest();
 601                 if ( !$latest ) {
 602                         return; // page doesn't exist or is missing page_latest info
 603                 }
 604
 605                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 606                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 607                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 608                         // transactions, where S1 normally only sees changes committed before the first S1
 609                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 610                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 611                         // happened after the first S1 SELECT.
 612                         // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 613                         $flags = Revision::READ_LOCKING;
 614                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 615                         // Bug T93976: if page_latest was loaded from the master, fetch the
 616                         // revision from there as well, as it may not exist yet on a slave DB.
 617                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 618                         $flags = Revision::READ_LATEST;
 619                 } else {
 620                         $flags = 0;
 621                 }
 622                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 623                 if ( $revision ) { // sanity
 624                         $this->setLastEdit( $revision );
 625                 }
 626         }
 627
 628         /**
 629          * Set the latest revision
 630          * @param Revision $revision
 631          */
 632         protected function setLastEdit( Revision $revision ) {
 633                 $this->mLastRevision = $revision;
 634                 $this->mTimestamp = $revision->getTimestamp();
 635         }
 636
 637         /**
 638          * Get the latest revision
 639          * @return Revision|null
 640          */
 641         public function getRevision() {
 642                 $this->loadLastEdit();
 643                 if ( $this->mLastRevision ) {
 644                         return $this->mLastRevision;
 645                 }
 646                 return null;
 647         }
 648
 649         /**
 650          * Get the content of the current revision. No side-effects...
 651          *
 652          * @param int $audience One of:
 653          *   Revision::FOR_PUBLIC       to be displayed to all users
 654          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 655          *   Revision::RAW              get the text regardless of permissions
 656          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 657          *   to the $audience parameter
 658          * @return Content|null The content of the current revision
 659          *
 660          * @since 1.21
 661          */
 662         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 663                 $this->loadLastEdit();
 664                 if ( $this->mLastRevision ) {
 665                         return $this->mLastRevision->getContent( $audience, $user );
 666                 }
 667                 return null;
 668         }
 669
 670         /**
 671          * Get the text of the current revision. No side-effects...
 672          *
 673          * @param int $audience One of:
 674          *   Revision::FOR_PUBLIC       to be displayed to all users
 675          *   Revision::FOR_THIS_USER    to be displayed to the given user
 676          *   Revision::RAW              get the text regardless of permissions
 677          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 678          *   to the $audience parameter
 679          * @return string|bool The text of the current revision
 680          * @deprecated since 1.21, getContent() should be used instead.
 681          */
 682         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 683                 ContentHandler::deprecated( __METHOD__, '1.21' );
 684
 685                 $this->loadLastEdit();
 686                 if ( $this->mLastRevision ) {
 687                         return $this->mLastRevision->getText( $audience, $user );
 688                 }
 689                 return false;
 690         }
 691
 692         /**
 693          * Get the text of the current revision. No side-effects...
 694          *
 695          * @return string|bool The text of the current revision. False on failure
 696          * @deprecated since 1.21, getContent() should be used instead.
 697          */
 698         public function getRawText() {
 699                 ContentHandler::deprecated( __METHOD__, '1.21' );
 700
 701                 return $this->getText( Revision::RAW );
 702         }
 703
 704         /**
 705          * @return string MW timestamp of last article revision
 706          */
 707         public function getTimestamp() {
 708                 // Check if the field has been filled by WikiPage::setTimestamp()
 709                 if ( !$this->mTimestamp ) {
 710                         $this->loadLastEdit();
 711                 }
 712
 713                 return wfTimestamp( TS_MW, $this->mTimestamp );
 714         }
 715
 716         /**
 717          * Set the page timestamp (use only to avoid DB queries)
 718          * @param string $ts MW timestamp of last article revision
 719          * @return void
 720          */
 721         public function setTimestamp( $ts ) {
 722                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 723         }
 724
 725         /**
 726          * @param int $audience One of:
 727          *   Revision::FOR_PUBLIC       to be displayed to all users
 728          *   Revision::FOR_THIS_USER    to be displayed to the given user
 729          *   Revision::RAW              get the text regardless of permissions
 730          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 731          *   to the $audience parameter
 732          * @return int User ID for the user that made the last article revision
 733          */
 734         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 735                 $this->loadLastEdit();
 736                 if ( $this->mLastRevision ) {
 737                         return $this->mLastRevision->getUser( $audience, $user );
 738                 } else {
 739                         return -1;
 740                 }
 741         }
 742
 743         /**
 744          * Get the User object of the user who created the page
 745          * @param int $audience One of:
 746          *   Revision::FOR_PUBLIC       to be displayed to all users
 747          *   Revision::FOR_THIS_USER    to be displayed to the given user
 748          *   Revision::RAW              get the text regardless of permissions
 749          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 750          *   to the $audience parameter
 751          * @return User|null
 752          */
 753         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 754                 $revision = $this->getOldestRevision();
 755                 if ( $revision ) {
 756                         $userName = $revision->getUserText( $audience, $user );
 757                         return User::newFromName( $userName, false );
 758                 } else {
 759                         return null;
 760                 }
 761         }
 762
 763         /**
 764          * @param int $audience One of:
 765          *   Revision::FOR_PUBLIC       to be displayed to all users
 766          *   Revision::FOR_THIS_USER    to be displayed to the given user
 767          *   Revision::RAW              get the text regardless of permissions
 768          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 769          *   to the $audience parameter
 770          * @return string Username of the user that made the last article revision
 771          */
 772         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 773                 $this->loadLastEdit();
 774                 if ( $this->mLastRevision ) {
 775                         return $this->mLastRevision->getUserText( $audience, $user );
 776                 } else {
 777                         return '';
 778                 }
 779         }
 780
 781         /**
 782          * @param int $audience One of:
 783          *   Revision::FOR_PUBLIC       to be displayed to all users
 784          *   Revision::FOR_THIS_USER    to be displayed to the given user
 785          *   Revision::RAW              get the text regardless of permissions
 786          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 787          *   to the $audience parameter
 788          * @return string Comment stored for the last article revision
 789          */
 790         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 791                 $this->loadLastEdit();
 792                 if ( $this->mLastRevision ) {
 793                         return $this->mLastRevision->getComment( $audience, $user );
 794                 } else {
 795                         return '';
 796                 }
 797         }
 798
 799         /**
 800          * Returns true if last revision was marked as "minor edit"
 801          *
 802          * @return bool Minor edit indicator for the last article revision.
 803          */
 804         public function getMinorEdit() {
 805                 $this->loadLastEdit();
 806                 if ( $this->mLastRevision ) {
 807                         return $this->mLastRevision->isMinor();
 808                 } else {
 809                         return false;
 810                 }
 811         }
 812
 813         /**
 814          * Get the cached timestamp for the last time the page changed.
 815          * This is only used to help handle slave lag by comparing to page_touched.
 816          * @return string MW timestamp
 817          */
 818         protected function getCachedLastEditTime() {
 819                 global $wgMemc;
 820                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 821                 return $wgMemc->get( $key );
 822         }
 823
 824         /**
 825          * Set the cached timestamp for the last time the page changed.
 826          * This is only used to help handle slave lag by comparing to page_touched.
 827          * @param string $timestamp
 828          * @return void
 829          */
 830         public function setCachedLastEditTime( $timestamp ) {
 831                 global $wgMemc;
 832                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 833                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 834         }
 835
 836         /**
 837          * Determine whether a page would be suitable for being counted as an
 838          * article in the site_stats table based on the title & its content
 839          *
 840          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 841          *   if false, the current database state will be used
 842          * @return bool
 843          */
 844         public function isCountable( $editInfo = false ) {
 845                 global $wgArticleCountMethod;
 846
 847                 if ( !$this->mTitle->isContentPage() ) {
 848                         return false;
 849                 }
 850
 851                 if ( $editInfo ) {
 852                         $content = $editInfo->pstContent;
 853                 } else {
 854                         $content = $this->getContent();
 855                 }
 856
 857                 if ( !$content || $content->isRedirect() ) {
 858                         return false;
 859                 }
 860
 861                 $hasLinks = null;
 862
 863                 if ( $wgArticleCountMethod === 'link' ) {
 864                         // nasty special case to avoid re-parsing to detect links
 865
 866                         if ( $editInfo ) {
 867                                 // ParserOutput::getLinks() is a 2D array of page links, so
 868                                 // to be really correct we would need to recurse in the array
 869                                 // but the main array should only have items in it if there are
 870                                 // links.
 871                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 872                         } else {
 873                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 874                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 875                         }
 876                 }
 877
 878                 return $content->isCountable( $hasLinks );
 879         }
 880
 881         /**
 882          * If this page is a redirect, get its target
 883          *
 884          * The target will be fetched from the redirect table if possible.
 885          * If this page doesn't have an entry there, call insertRedirect()
 886          * @return Title|null Title object, or null if this page is not a redirect
 887          */
 888         public function getRedirectTarget() {
 889                 if ( !$this->mTitle->isRedirect() ) {
 890                         return null;
 891                 }
 892
 893                 if ( $this->mRedirectTarget !== null ) {
 894                         return $this->mRedirectTarget;
 895                 }
 896
 897                 // Query the redirect table
 898                 $dbr = wfGetDB( DB_SLAVE );
 899                 $row = $dbr->selectRow( 'redirect',
 900                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 901                         array( 'rd_from' => $this->getId() ),
 902                         __METHOD__
 903                 );
 904
 905                 // rd_fragment and rd_interwiki were added later, populate them if empty
 906                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 907                         $this->mRedirectTarget = Title::makeTitle(
 908                                 $row->rd_namespace, $row->rd_title,
 909                                 $row->rd_fragment, $row->rd_interwiki );
 910                         return $this->mRedirectTarget;
 911                 }
 912
 913                 // This page doesn't have an entry in the redirect table
 914                 $this->mRedirectTarget = $this->insertRedirect();
 915                 return $this->mRedirectTarget;
 916         }
 917
 918         /**
 919          * Insert an entry for this page into the redirect table.
 920          *
 921          * Don't call this function directly unless you know what you're doing.
 922          * @return Title|null Title object or null if not a redirect
 923          */
 924         public function insertRedirect() {
 925                 // recurse through to only get the final target
 926                 $content = $this->getContent();
 927                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 928                 if ( !$retval ) {
 929                         return null;
 930                 }
 931                 $this->insertRedirectEntry( $retval );
 932                 return $retval;
 933         }
 934
 935         /**
 936          * Insert or update the redirect table entry for this page to indicate
 937          * it redirects to $rt .
 938          * @param Title $rt Redirect target
 939          */
 940         public function insertRedirectEntry( $rt ) {
 941                 $dbw = wfGetDB( DB_MASTER );
 942                 $dbw->replace( 'redirect', array( 'rd_from' ),
 943                         array(
 944                                 'rd_from' => $this->getId(),
 945                                 'rd_namespace' => $rt->getNamespace(),
 946                                 'rd_title' => $rt->getDBkey(),
 947                                 'rd_fragment' => $rt->getFragment(),
 948                                 'rd_interwiki' => $rt->getInterwiki(),
 949                         ),
 950                         __METHOD__
 951                 );
 952         }
 953
 954         /**
 955          * Get the Title object or URL this page redirects to
 956          *
 957          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 958          */
 959         public function followRedirect() {
 960                 return $this->getRedirectURL( $this->getRedirectTarget() );
 961         }
 962
 963         /**
 964          * Get the Title object or URL to use for a redirect. We use Title
 965          * objects for same-wiki, non-special redirects and URLs for everything
 966          * else.
 967          * @param Title $rt Redirect target
 968          * @return bool|Title|string False, Title object of local target, or string with URL
 969          */
 970         public function getRedirectURL( $rt ) {
 971                 if ( !$rt ) {
 972                         return false;
 973                 }
 974
 975                 if ( $rt->isExternal() ) {
 976                         if ( $rt->isLocal() ) {
 977                                 // Offsite wikis need an HTTP redirect.
 978                                 //
 979                                 // This can be hard to reverse and may produce loops,
 980                                 // so they may be disabled in the site configuration.
 981                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 982                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 983                         } else {
 984                                 // External pages without "local" bit set are not valid
 985                                 // redirect targets
 986                                 return false;
 987                         }
 988                 }
 989
 990                 if ( $rt->isSpecialPage() ) {
 991                         // Gotta handle redirects to special pages differently:
 992                         // Fill the HTTP response "Location" header and ignore
 993                         // the rest of the page we're on.
 994                         //
 995                         // Some pages are not valid targets
 996                         if ( $rt->isValidRedirectTarget() ) {
 997                                 return $rt->getFullURL();
 998                         } else {
 999                                 return false;
1000                         }
1001                 }
1002
1003                 return $rt;
1004         }
1005
1006         /**
1007          * Get a list of users who have edited this article, not including the user who made
1008          * the most recent revision, which you can get from $article->getUser() if you want it
1009          * @return UserArrayFromResult
1010          */
1011         public function getContributors() {
1012                 // @todo FIXME: This is expensive; cache this info somewhere.
1013
1014                 $dbr = wfGetDB( DB_SLAVE );
1015
1016                 if ( $dbr->implicitGroupby() ) {
1017                         $realNameField = 'user_real_name';
1018                 } else {
1019                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1020                 }
1021
1022                 $tables = array( 'revision', 'user' );
1023
1024                 $fields = array(
1025                         'user_id' => 'rev_user',
1026                         'user_name' => 'rev_user_text',
1027                         $realNameField,
1028                         'timestamp' => 'MAX(rev_timestamp)',
1029                 );
1030
1031                 $conds = array( 'rev_page' => $this->getId() );
1032
1033                 // The user who made the top revision gets credited as "this page was last edited by
1034                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1035                 $user = $this->getUser();
1036                 if ( $user ) {
1037                         $conds[] = "rev_user != $user";
1038                 } else {
1039                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1040                 }
1041
1042                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1043
1044                 $jconds = array(
1045                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1046                 );
1047
1048                 $options = array(
1049                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1050                         'ORDER BY' => 'timestamp DESC',
1051                 );
1052
1053                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1054                 return new UserArrayFromResult( $res );
1055         }
1056
1057         /**
1058          * Get the last N authors
1059          * @param int $num Number of revisions to get
1060          * @param int|string $revLatest The latest rev_id, selected from the master (optional)
1061          * @return array Array of authors, duplicates not removed
1062          */
1063         public function getLastNAuthors( $num, $revLatest = 0 ) {
1064                 // First try the slave
1065                 // If that doesn't have the latest revision, try the master
1066                 $continue = 2;
1067                 $db = wfGetDB( DB_SLAVE );
1068
1069                 do {
1070                         $res = $db->select( array( 'page', 'revision' ),
1071                                 array( 'rev_id', 'rev_user_text' ),
1072                                 array(
1073                                         'page_namespace' => $this->mTitle->getNamespace(),
1074                                         'page_title' => $this->mTitle->getDBkey(),
1075                                         'rev_page = page_id'
1076                                 ), __METHOD__,
1077                                 array(
1078                                         'ORDER BY' => 'rev_timestamp DESC',
1079                                         'LIMIT' => $num
1080                                 )
1081                         );
1082
1083                         if ( !$res ) {
1084                                 return array();
1085                         }
1086
1087                         $row = $db->fetchObject( $res );
1088
1089                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1090                                 $db = wfGetDB( DB_MASTER );
1091                                 $continue--;
1092                         } else {
1093                                 $continue = 0;
1094                         }
1095                 } while ( $continue );
1096
1097                 $authors = array( $row->rev_user_text );
1098
1099                 foreach ( $res as $row ) {
1100                         $authors[] = $row->rev_user_text;
1101                 }
1102
1103                 return $authors;
1104         }
1105
1106         /**
1107          * Should the parser cache be used?
1108          *
1109          * @param ParserOptions $parserOptions ParserOptions to check
1110          * @param int $oldid
1111          * @return bool
1112          */
1113         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1114                 global $wgEnableParserCache;
1115
1116                 return $wgEnableParserCache
1117                         && $parserOptions->getStubThreshold() == 0
1118                         && $this->exists()
1119                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1120                         && $this->getContentHandler()->isParserCacheSupported();
1121         }
1122
1123         /**
1124          * Get a ParserOutput for the given ParserOptions and revision ID.
1125          * The parser cache will be used if possible.
1126          *
1127          * @since 1.19
1128          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1129          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1130          *   get the current revision (default value)
1131          *
1132          * @return ParserOutput|bool ParserOutput or false if the revision was not found
1133          */
1134         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1135
1136                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1137                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1138                 if ( $parserOptions->getStubThreshold() ) {
1139                         wfIncrStats( 'pcache_miss_stub' );
1140                 }
1141
1142                 if ( $useParserCache ) {
1143                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1144                         if ( $parserOutput !== false ) {
1145                                 return $parserOutput;
1146                         }
1147                 }
1148
1149                 if ( $oldid === null || $oldid === 0 ) {
1150                         $oldid = $this->getLatest();
1151                 }
1152
1153                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1154                 $pool->execute();
1155
1156                 return $pool->getParserOutput();
1157         }
1158
1159         /**
1160          * Do standard deferred updates after page view (existing or missing page)
1161          * @param User $user The relevant user
1162          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1163          */
1164         public function doViewUpdates( User $user, $oldid = 0 ) {
1165                 if ( wfReadOnly() ) {
1166                         return;
1167                 }
1168
1169                 // Update newtalk / watchlist notification status
1170                 $user->clearNotification( $this->mTitle, $oldid );
1171         }
1172
1173         /**
1174          * Perform the actions of a page purging
1175          * @return bool
1176          */
1177         public function doPurge() {
1178                 global $wgUseSquid;
1179
1180                 if ( !Hooks::run( 'ArticlePurge', array( &$this ) ) ) {
1181                         return false;
1182                 }
1183
1184                 // Invalidate the cache
1185                 $this->mTitle->invalidateCache();
1186
1187                 if ( $wgUseSquid ) {
1188                         // Commit the transaction before the purge is sent
1189                         $dbw = wfGetDB( DB_MASTER );
1190                         $dbw->commit( __METHOD__ );
1191
1192                         // Send purge
1193                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1194                         $update->doUpdate();
1195                 }
1196
1197                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1198                         // @todo move this logic to MessageCache
1199
1200                         if ( $this->exists() ) {
1201                                 // NOTE: use transclusion text for messages.
1202                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1203
1204                                 $content = $this->getContent();
1205                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1206
1207                                 if ( $text === null ) {
1208                                         $text = false;
1209                                 }
1210                         } else {
1211                                 $text = false;
1212                         }
1213
1214                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1215                 }
1216                 return true;
1217         }
1218
1219         /**
1220          * Insert a new empty page record for this article.
1221          * This *must* be followed up by creating a revision
1222          * and running $this->updateRevisionOn( ... );
1223          * or else the record will be left in a funky state.
1224          * Best if all done inside a transaction.
1225          *
1226          * @param DatabaseBase $dbw
1227          * @return int The newly created page_id key, or false if the title already existed
1228          */
1229         public function insertOn( $dbw ) {
1230
1231                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1232                 $dbw->insert( 'page', array(
1233                         'page_id'           => $page_id,
1234                         'page_namespace'    => $this->mTitle->getNamespace(),
1235                         'page_title'        => $this->mTitle->getDBkey(),
1236                         'page_restrictions' => '',
1237                         'page_is_redirect'  => 0, // Will set this shortly...
1238                         'page_is_new'       => 1,
1239                         'page_random'       => wfRandom(),
1240                         'page_touched'      => $dbw->timestamp(),
1241                         'page_latest'       => 0, // Fill this in shortly...
1242                         'page_len'          => 0, // Fill this in shortly...
1243                 ), __METHOD__, 'IGNORE' );
1244
1245                 $affected = $dbw->affectedRows();
1246
1247                 if ( $affected ) {
1248                         $newid = $dbw->insertId();
1249                         $this->mId = $newid;
1250                         $this->mTitle->resetArticleID( $newid );
1251                 }
1252
1253                 return $affected ? $newid : false;
1254         }
1255
1256         /**
1257          * Update the page record to point to a newly saved revision.
1258          *
1259          * @param DatabaseBase $dbw
1260          * @param Revision $revision For ID number, and text used to set
1261          *   length and redirect status fields
1262          * @param int $lastRevision If given, will not overwrite the page field
1263          *   when different from the currently set value.
1264          *   Giving 0 indicates the new page flag should be set on.
1265          * @param bool $lastRevIsRedirect If given, will optimize adding and
1266          *   removing rows in redirect table.
1267          * @return bool True on success, false on failure
1268          */
1269         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1270                 $lastRevIsRedirect = null
1271         ) {
1272                 global $wgContentHandlerUseDB;
1273
1274                 // Assertion to try to catch T92046
1275                 if ( (int)$revision->getId() === 0 ) {
1276                         throw new InvalidArgumentException(
1277                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1278                         );
1279                 }
1280
1281                 $content = $revision->getContent();
1282                 $len = $content ? $content->getSize() : 0;
1283                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1284
1285                 $conditions = array( 'page_id' => $this->getId() );
1286
1287                 if ( !is_null( $lastRevision ) ) {
1288                         // An extra check against threads stepping on each other
1289                         $conditions['page_latest'] = $lastRevision;
1290                 }
1291
1292                 $now = wfTimestampNow();
1293                 $row = array( /* SET */
1294                         'page_latest'      => $revision->getId(),
1295                         'page_touched'     => $dbw->timestamp( $now ),
1296                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1297                         'page_is_redirect' => $rt !== null ? 1 : 0,
1298                         'page_len'         => $len,
1299                 );
1300
1301                 if ( $wgContentHandlerUseDB ) {
1302                         $row['page_content_model'] = $revision->getContentModel();
1303                 }
1304
1305                 $dbw->update( 'page',
1306                         $row,
1307                         $conditions,
1308                         __METHOD__ );
1309
1310                 $result = $dbw->affectedRows() > 0;
1311                 if ( $result ) {
1312                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1313                         $this->setLastEdit( $revision );
1314                         $this->setCachedLastEditTime( $now );
1315                         $this->mLatest = $revision->getId();
1316                         $this->mIsRedirect = (bool)$rt;
1317                         // Update the LinkCache.
1318                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1319                                                                                                         $this->mLatest, $revision->getContentModel() );
1320                 }
1321
1322                 return $result;
1323         }
1324
1325         /**
1326          * Add row to the redirect table if this is a redirect, remove otherwise.
1327          *
1328          * @param DatabaseBase $dbw
1329          * @param Title $redirectTitle Title object pointing to the redirect target,
1330          *   or NULL if this is not a redirect
1331          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1332          *   removing rows in redirect table.
1333          * @return bool True on success, false on failure
1334          * @private
1335          */
1336         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1337                 // Always update redirects (target link might have changed)
1338                 // Update/Insert if we don't know if the last revision was a redirect or not
1339                 // Delete if changing from redirect to non-redirect
1340                 $isRedirect = !is_null( $redirectTitle );
1341
1342                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1343                         return true;
1344                 }
1345
1346                 if ( $isRedirect ) {
1347                         $this->insertRedirectEntry( $redirectTitle );
1348                 } else {
1349                         // This is not a redirect, remove row from redirect table
1350                         $where = array( 'rd_from' => $this->getId() );
1351                         $dbw->delete( 'redirect', $where, __METHOD__ );
1352                 }
1353
1354                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1355                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1356                 }
1357
1358                 return ( $dbw->affectedRows() != 0 );
1359         }
1360
1361         /**
1362          * If the given revision is newer than the currently set page_latest,
1363          * update the page record. Otherwise, do nothing.
1364          *
1365          * @deprecated since 1.24, use updateRevisionOn instead
1366          *
1367          * @param DatabaseBase $dbw
1368          * @param Revision $revision
1369          * @return bool
1370          */
1371         public function updateIfNewerOn( $dbw, $revision ) {
1372
1373                 $row = $dbw->selectRow(
1374                         array( 'revision', 'page' ),
1375                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1376                         array(
1377                                 'page_id' => $this->getId(),
1378                                 'page_latest=rev_id' ),
1379                         __METHOD__ );
1380
1381                 if ( $row ) {
1382                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1383                                 return false;
1384                         }
1385                         $prev = $row->rev_id;
1386                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1387                 } else {
1388                         // No or missing previous revision; mark the page as new
1389                         $prev = 0;
1390                         $lastRevIsRedirect = null;
1391                 }
1392
1393                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1394
1395                 return $ret;
1396         }
1397
1398         /**
1399          * Get the content 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 mixed String on success, false on failure
1405          * @since 1.21
1406          * Before we had the Content object, this was done in getUndoText
1407          */
1408         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1409                 $handler = $undo->getContentHandler();
1410                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1411         }
1412
1413         /**
1414          * Get the text that needs to be saved in order to undo all revisions
1415          * between $undo and $undoafter. Revisions must belong to the same page,
1416          * must exist and must not be deleted
1417          * @param Revision $undo
1418          * @param Revision $undoafter Must be an earlier revision than $undo
1419          * @return string|bool String on success, false on failure
1420          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1421          */
1422         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1423                 ContentHandler::deprecated( __METHOD__, '1.21' );
1424
1425                 $this->loadLastEdit();
1426
1427                 if ( $this->mLastRevision ) {
1428                         if ( is_null( $undoafter ) ) {
1429                                 $undoafter = $undo->getPrevious();
1430                         }
1431
1432                         $handler = $this->getContentHandler();
1433                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1434
1435                         if ( !$undone ) {
1436                                 return false;
1437                         } else {
1438                                 return ContentHandler::getContentText( $undone );
1439                         }
1440                 }
1441
1442                 return false;
1443         }
1444
1445         /**
1446          * @param string|number|null|bool $sectionId Section identifier as a number or string
1447          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1448          * or 'new' for a new section.
1449          * @param string $text New text of the section.
1450          * @param string $sectionTitle New section's subject, only if $section is "new".
1451          * @param string $edittime Revision timestamp or null to use the current revision.
1452          *
1453          * @throws MWException
1454          * @return string New complete article text, or null if error.
1455          *
1456          * @deprecated since 1.21, use replaceSectionAtRev() instead
1457          */
1458         public function replaceSection( $sectionId, $text, $sectionTitle = '',
1459                 $edittime = null
1460         ) {
1461                 ContentHandler::deprecated( __METHOD__, '1.21' );
1462
1463                 //NOTE: keep condition in sync with condition in replaceSectionContent!
1464                 if ( strval( $sectionId ) === '' ) {
1465                         // Whole-page edit; let the whole text through
1466                         return $text;
1467                 }
1468
1469                 if ( !$this->supportsSections() ) {
1470                         throw new MWException( "sections not supported for content model " .
1471                                 $this->getContentHandler()->getModelID() );
1472                 }
1473
1474                 // could even make section title, but that's not required.
1475                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1476
1477                 $newContent = $this->replaceSectionContent( $sectionId, $sectionContent, $sectionTitle,
1478                         $edittime );
1479
1480                 return ContentHandler::getContentText( $newContent );
1481         }
1482
1483         /**
1484          * Returns true if this page's content model supports sections.
1485          *
1486          * @return bool
1487          *
1488          * @todo The skin should check this and not offer section functionality if
1489          *   sections are not supported.
1490          * @todo The EditPage should check this and not offer section functionality
1491          *   if sections are not supported.
1492          */
1493         public function supportsSections() {
1494                 return $this->getContentHandler()->supportsSections();
1495         }
1496
1497         /**
1498          * @param string|number|null|bool $sectionId Section identifier as a number or string
1499          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1500          * or 'new' for a new section.
1501          * @param Content $sectionContent New content of the section.
1502          * @param string $sectionTitle New section's subject, only if $section is "new".
1503          * @param string $edittime Revision timestamp or null to use the current revision.
1504          *
1505          * @throws MWException
1506          * @return Content New complete article content, or null if error.
1507          *
1508          * @since 1.21
1509          * @deprecated since 1.24, use replaceSectionAtRev instead
1510          */
1511         public function replaceSectionContent( $sectionId, Content $sectionContent, $sectionTitle = '',
1512                 $edittime = null ) {
1513
1514                 $baseRevId = null;
1515                 if ( $edittime && $sectionId !== 'new' ) {
1516                         $dbw = wfGetDB( DB_MASTER );
1517                         $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1518                         if ( $rev ) {
1519                                 $baseRevId = $rev->getId();
1520                         }
1521                 }
1522
1523                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1524         }
1525
1526         /**
1527          * @param string|number|null|bool $sectionId Section identifier as a number or string
1528          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1529          * or 'new' for a new section.
1530          * @param Content $sectionContent New content of the section.
1531          * @param string $sectionTitle New section's subject, only if $section is "new".
1532          * @param int|null $baseRevId
1533          *
1534          * @throws MWException
1535          * @return Content New complete article content, or null if error.
1536          *
1537          * @since 1.24
1538          */
1539         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1540                 $sectionTitle = '', $baseRevId = null
1541         ) {
1542
1543                 if ( strval( $sectionId ) === '' ) {
1544                         // Whole-page edit; let the whole text through
1545                         $newContent = $sectionContent;
1546                 } else {
1547                         if ( !$this->supportsSections() ) {
1548                                 throw new MWException( "sections not supported for content model " .
1549                                         $this->getContentHandler()->getModelID() );
1550                         }
1551
1552                         // Bug 30711: always use current version when adding a new section
1553                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1554                                 $oldContent = $this->getContent();
1555                         } else {
1556                                 $rev = Revision::newFromId( $baseRevId );
1557                                 if ( !$rev ) {
1558                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1559                                                 $this->getId() . "; section: $sectionId)\n" );
1560                                         return null;
1561                                 }
1562
1563                                 $oldContent = $rev->getContent();
1564                         }
1565
1566                         if ( !$oldContent ) {
1567                                 wfDebug( __METHOD__ . ": no page text\n" );
1568                                 return null;
1569                         }
1570
1571                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1572                 }
1573
1574                 return $newContent;
1575         }
1576
1577         /**
1578          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1579          * @param int $flags
1580          * @return int Updated $flags
1581          */
1582         public function checkFlags( $flags ) {
1583                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1584                         if ( $this->exists() ) {
1585                                 $flags |= EDIT_UPDATE;
1586                         } else {
1587                                 $flags |= EDIT_NEW;
1588                         }
1589                 }
1590
1591                 return $flags;
1592         }
1593
1594         /**
1595          * Change an existing article or create a new article. Updates RC and all necessary caches,
1596          * optionally via the deferred update array.
1597          *
1598          * @param string $text New text
1599          * @param string $summary Edit summary
1600          * @param int $flags Bitfield:
1601          *      EDIT_NEW
1602          *          Article is known or assumed to be non-existent, create a new one
1603          *      EDIT_UPDATE
1604          *          Article is known or assumed to be pre-existing, update it
1605          *      EDIT_MINOR
1606          *          Mark this edit minor, if the user is allowed to do so
1607          *      EDIT_SUPPRESS_RC
1608          *          Do not log the change in recentchanges
1609          *      EDIT_FORCE_BOT
1610          *          Mark the edit a "bot" edit regardless of user rights
1611          *      EDIT_DEFER_UPDATES
1612          *          Defer some of the updates until the end of index.php
1613          *      EDIT_AUTOSUMMARY
1614          *          Fill in blank summaries with generated text where possible
1615          *
1616          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1617          * article will be detected. If EDIT_UPDATE is specified and the article
1618          * doesn't exist, the function will return an edit-gone-missing error. If
1619          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1620          * error will be returned. These two conditions are also possible with
1621          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1622          *
1623          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1624          *   This is not the parent revision ID, rather the revision ID for older
1625          *   content used as the source for a rollback, for example.
1626          * @param User $user The user doing the edit
1627          *
1628          * @throws MWException
1629          * @return Status Possible errors:
1630          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1631          *     set the fatal flag of $status
1632          *   edit-gone-missing: In update mode, but the article didn't exist.
1633          *   edit-conflict: In update mode, the article changed unexpectedly.
1634          *   edit-no-change: Warning that the text was the same as before.
1635          *   edit-already-exists: In creation mode, but the article already exists.
1636          *
1637          * Extensions may define additional errors.
1638          *
1639          * $return->value will contain an associative array with members as follows:
1640          *     new: Boolean indicating if the function attempted to create a new article.
1641          *     revision: The revision object for the inserted revision, or null.
1642          *
1643          * Compatibility note: this function previously returned a boolean value
1644          * indicating success/failure
1645          *
1646          * @deprecated since 1.21: use doEditContent() instead.
1647          */
1648         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1649                 ContentHandler::deprecated( __METHOD__, '1.21' );
1650
1651                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1652
1653                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1654         }
1655
1656         /**
1657          * Change an existing article or create a new article. Updates RC and all necessary caches,
1658          * optionally via the deferred update array.
1659          *
1660          * @param Content $content New content
1661          * @param string $summary Edit summary
1662          * @param int $flags Bitfield:
1663          *      EDIT_NEW
1664          *          Article is known or assumed to be non-existent, create a new one
1665          *      EDIT_UPDATE
1666          *          Article is known or assumed to be pre-existing, update it
1667          *      EDIT_MINOR
1668          *          Mark this edit minor, if the user is allowed to do so
1669          *      EDIT_SUPPRESS_RC
1670          *          Do not log the change in recentchanges
1671          *      EDIT_FORCE_BOT
1672          *          Mark the edit a "bot" edit regardless of user rights
1673          *      EDIT_DEFER_UPDATES
1674          *          Defer some of the updates until the end of index.php
1675          *      EDIT_AUTOSUMMARY
1676          *          Fill in blank summaries with generated text where possible
1677          *
1678          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1679          * article will be detected. If EDIT_UPDATE is specified and the article
1680          * doesn't exist, the function will return an edit-gone-missing error. If
1681          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1682          * error will be returned. These two conditions are also possible with
1683          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1684          *
1685          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1686          *   This is not the parent revision ID, rather the revision ID for older
1687          *   content used as the source for a rollback, for example.
1688          * @param User $user The user doing the edit
1689          * @param string $serialFormat Format for storing the content in the
1690          *   database.
1691          *
1692          * @throws MWException
1693          * @return Status Possible errors:
1694          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1695          *       set the fatal flag of $status.
1696          *     edit-gone-missing: In update mode, but the article didn't exist.
1697          *     edit-conflict: In update mode, the article changed unexpectedly.
1698          *     edit-no-change: Warning that the text was the same as before.
1699          *     edit-already-exists: In creation mode, but the article already exists.
1700          *
1701          *  Extensions may define additional errors.
1702          *
1703          *  $return->value will contain an associative array with members as follows:
1704          *     new: Boolean indicating if the function attempted to create a new article.
1705          *     revision: The revision object for the inserted revision, or null.
1706          *
1707          * @since 1.21
1708          */
1709         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1710                 User $user = null, $serialFormat = null
1711         ) {
1712                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1713
1714                 // Low-level sanity check
1715                 if ( $this->mTitle->getText() === '' ) {
1716                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1717                 }
1718
1719                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1720                         return Status::newFatal( 'content-not-allowed-here',
1721                                 ContentHandler::getLocalizedName( $content->getModel() ),
1722                                 $this->getTitle()->getPrefixedText() );
1723                 }
1724
1725                 $user = is_null( $user ) ? $wgUser : $user;
1726                 $status = Status::newGood( array() );
1727
1728                 // Load the data from the master database if needed.
1729                 // The caller may already loaded it from the master or even loaded it using
1730                 // SELECT FOR UPDATE, so do not override that using clear().
1731                 $this->loadPageData( 'fromdbmaster' );
1732
1733                 $flags = $this->checkFlags( $flags );
1734
1735                 // handle hook
1736                 $hook_args = array( &$this, &$user, &$content, &$summary,
1737                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1738
1739                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1740                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1741
1742                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1743
1744                         if ( $status->isOK() ) {
1745                                 $status->fatal( 'edit-hook-aborted' );
1746                         }
1747
1748                         return $status;
1749                 }
1750
1751                 // Silently ignore EDIT_MINOR if not allowed
1752                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1753                 $bot = $flags & EDIT_FORCE_BOT;
1754
1755                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1756
1757                 $oldsize = $old_content ? $old_content->getSize() : 0;
1758                 $oldid = $this->getLatest();
1759                 $oldIsRedirect = $this->isRedirect();
1760                 $oldcountable = $this->isCountable();
1761
1762                 $handler = $content->getContentHandler();
1763
1764                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1765                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1766                         if ( !$old_content ) {
1767                                 $old_content = null;
1768                         }
1769                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1770                 }
1771
1772                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat );
1773                 $serialized = $editInfo->pst;
1774
1775                 /**
1776                  * @var Content $content
1777                  */
1778                 $content = $editInfo->pstContent;
1779                 $newsize = $content->getSize();
1780
1781                 $dbw = wfGetDB( DB_MASTER );
1782                 $now = wfTimestampNow();
1783                 $this->mTimestamp = $now;
1784
1785                 if ( $flags & EDIT_UPDATE ) {
1786                         // Update article, but only if changed.
1787                         $status->value['new'] = false;
1788
1789                         if ( !$oldid ) {
1790                                 // Article gone missing
1791                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1792                                 $status->fatal( 'edit-gone-missing' );
1793
1794                                 return $status;
1795                         } elseif ( !$old_content ) {
1796                                 // Sanity check for bug 37225
1797                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1798                         }
1799
1800                         $revision = new Revision( array(
1801                                 'page'       => $this->getId(),
1802                                 'title'      => $this->getTitle(), // for determining the default content model
1803                                 'comment'    => $summary,
1804                                 'minor_edit' => $isminor,
1805                                 'text'       => $serialized,
1806                                 'len'        => $newsize,
1807                                 'parent_id'  => $oldid,
1808                                 'user'       => $user->getId(),
1809                                 'user_text'  => $user->getName(),
1810                                 'timestamp'  => $now,
1811                                 'content_model' => $content->getModel(),
1812                                 'content_format' => $serialFormat,
1813                         ) ); // XXX: pass content object?!
1814
1815                         $changed = !$content->equals( $old_content );
1816
1817                         if ( $changed ) {
1818                                 $dbw->begin( __METHOD__ );
1819                                 try {
1820
1821                                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1822                                         $status->merge( $prepStatus );
1823
1824                                         if ( !$status->isOK() ) {
1825                                                 $dbw->rollback( __METHOD__ );
1826
1827                                                 return $status;
1828                                         }
1829                                         $revisionId = $revision->insertOn( $dbw );
1830
1831                                         // Update page
1832                                         //
1833                                         // We check for conflicts by comparing $oldid with the current latest revision ID.
1834                                         $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1835
1836                                         if ( !$ok ) {
1837                                                 // Belated edit conflict! Run away!!
1838                                                 $status->fatal( 'edit-conflict' );
1839
1840                                                 $dbw->rollback( __METHOD__ );
1841
1842                                                 return $status;
1843                                         }
1844
1845                                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1846                                         // Update recentchanges
1847                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1848                                                 // Mark as patrolled if the user can do so
1849                                                 $patrolled = $wgUseRCPatrol && !count(
1850                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1851                                                 // Add RC row to the DB
1852                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1853                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1854                                                         $revisionId, $patrolled
1855                                                 );
1856
1857                                                 // Log auto-patrolled edits
1858                                                 if ( $patrolled ) {
1859                                                         PatrolLog::record( $rc, true, $user );
1860                                                 }
1861                                         }
1862                                         $user->incEditCount();
1863                                 } catch ( Exception $e ) {
1864                                         $dbw->rollback( __METHOD__ );
1865                                         // Question: Would it perhaps be better if this method turned all
1866                                         // exceptions into $status's?
1867                                         throw $e;
1868                                 }
1869                                 $dbw->commit( __METHOD__ );
1870                         } else {
1871                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1872                                 // related variables correctly
1873                                 $revision->setId( $this->getLatest() );
1874                         }
1875
1876                         // Update links tables, site stats, etc.
1877                         $this->doEditUpdates(
1878                                 $revision,
1879                                 $user,
1880                                 array(
1881                                         'changed' => $changed,
1882                                         'oldcountable' => $oldcountable
1883                                 )
1884                         );
1885
1886                         if ( !$changed ) {
1887                                 $status->warning( 'edit-no-change' );
1888                                 $revision = null;
1889                                 // Update page_touched, this is usually implicit in the page update
1890                                 // Other cache updates are done in onArticleEdit()
1891                                 $this->mTitle->invalidateCache();
1892                         }
1893                 } else {
1894                         // Create new article
1895                         $status->value['new'] = true;
1896
1897                         $dbw->begin( __METHOD__ );
1898                         try {
1899
1900                                 $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1901                                 $status->merge( $prepStatus );
1902
1903                                 if ( !$status->isOK() ) {
1904                                         $dbw->rollback( __METHOD__ );
1905
1906                                         return $status;
1907                                 }
1908
1909                                 $status->merge( $prepStatus );
1910
1911                                 // Add the page record; stake our claim on this title!
1912                                 // This will return false if the article already exists
1913                                 $newid = $this->insertOn( $dbw );
1914
1915                                 if ( $newid === false ) {
1916                                         $dbw->rollback( __METHOD__ );
1917                                         $status->fatal( 'edit-already-exists' );
1918
1919                                         return $status;
1920                                 }
1921
1922                                 // Save the revision text...
1923                                 $revision = new Revision( array(
1924                                         'page'       => $newid,
1925                                         'title'      => $this->getTitle(), // for determining the default content model
1926                                         'comment'    => $summary,
1927                                         'minor_edit' => $isminor,
1928                                         'text'       => $serialized,
1929                                         'len'        => $newsize,
1930                                         'user'       => $user->getId(),
1931                                         'user_text'  => $user->getName(),
1932                                         'timestamp'  => $now,
1933                                         'content_model' => $content->getModel(),
1934                                         'content_format' => $serialFormat,
1935                                 ) );
1936                                 $revisionId = $revision->insertOn( $dbw );
1937
1938                                 // Bug 37225: use accessor to get the text as Revision may trim it
1939                                 $content = $revision->getContent(); // sanity; get normalized version
1940
1941                                 if ( $content ) {
1942                                         $newsize = $content->getSize();
1943                                 }
1944
1945                                 // Update the page record with revision data
1946                                 $this->updateRevisionOn( $dbw, $revision, 0 );
1947
1948                                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1949
1950                                 // Update recentchanges
1951                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1952                                         // Mark as patrolled if the user can do so
1953                                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1954                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1955                                         // Add RC row to the DB
1956                                         $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1957                                                 '', $newsize, $revisionId, $patrolled );
1958
1959                                         // Log auto-patrolled edits
1960                                         if ( $patrolled ) {
1961                                                 PatrolLog::record( $rc, true, $user );
1962                                         }
1963                                 }
1964                                 $user->incEditCount();
1965
1966                         } catch ( Exception $e ) {
1967                                 $dbw->rollback( __METHOD__ );
1968                                 throw $e;
1969                         }
1970                         $dbw->commit( __METHOD__ );
1971
1972                         // Update links, etc.
1973                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1974
1975                         $hook_args = array( &$this, &$user, $content, $summary,
1976                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1977
1978                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1979                         Hooks::run( 'PageContentInsertComplete', $hook_args );
1980                 }
1981
1982                 // Do updates right now unless deferral was requested
1983                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1984                         DeferredUpdates::doUpdates();
1985                 }
1986
1987                 // Return the new revision (or null) to the caller
1988                 $status->value['revision'] = $revision;
1989
1990                 $hook_args = array( &$this, &$user, $content, $summary,
1991                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1992
1993                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1994                 Hooks::run( 'PageContentSaveComplete', $hook_args );
1995
1996                 // Promote user to any groups they meet the criteria for
1997                 $dbw->onTransactionIdle( function () use ( $user ) {
1998                         $user->addAutopromoteOnceGroups( 'onEdit' );
1999                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
2000                 } );
2001
2002                 return $status;
2003         }
2004
2005         /**
2006          * Get parser options suitable for rendering the primary article wikitext
2007          *
2008          * @see ContentHandler::makeParserOptions
2009          *
2010          * @param IContextSource|User|string $context One of the following:
2011          *        - IContextSource: Use the User and the Language of the provided
2012          *          context
2013          *        - User: Use the provided User object and $wgLang for the language,
2014          *          so use an IContextSource object if possible.
2015          *        - 'canonical': Canonical options (anonymous user with default
2016          *          preferences and content language).
2017          * @return ParserOptions
2018          */
2019         public function makeParserOptions( $context ) {
2020                 $options = $this->getContentHandler()->makeParserOptions( $context );
2021
2022                 if ( $this->getTitle()->isConversionTable() ) {
2023                         // @todo ConversionTable should become a separate content model, so
2024                         // we don't need special cases like this one.
2025                         $options->disableContentConversion();
2026                 }
2027
2028                 return $options;
2029         }
2030
2031         /**
2032          * Prepare text which is about to be saved.
2033          * Returns a stdClass with source, pst and output members
2034          *
2035          * @deprecated since 1.21: use prepareContentForEdit instead.
2036          * @return object
2037          */
2038         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2039                 ContentHandler::deprecated( __METHOD__, '1.21' );
2040                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2041                 return $this->prepareContentForEdit( $content, $revid, $user );
2042         }
2043
2044         /**
2045          * Prepare content which is about to be saved.
2046          * Returns a stdClass with source, pst and output members
2047          *
2048          * @param Content $content
2049          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2050          *        revision ID is also accepted, but this is deprecated.
2051          * @param User|null $user
2052          * @param string|null $serialFormat
2053          * @param bool $useCache Check shared prepared edit cache
2054          *
2055          * @return object
2056          *
2057          * @since 1.21
2058          */
2059         public function prepareContentForEdit(
2060                 Content $content, $revision = null, User $user = null, $serialFormat = null, $useCache = true
2061         ) {
2062                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2063
2064                 if ( is_object( $revision ) ) {
2065                         $revid = $revision->getId();
2066                 } else {
2067                         $revid = $revision;
2068                         // This code path is deprecated, and nothing is known to
2069                         // use it, so performance here shouldn't be a worry.
2070                         if ( $revid !== null ) {
2071                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2072                         } else {
2073                                 $revision = null;
2074                         }
2075                 }
2076
2077                 $user = is_null( $user ) ? $wgUser : $user;
2078                 //XXX: check $user->getId() here???
2079
2080                 // Use a sane default for $serialFormat, see bug 57026
2081                 if ( $serialFormat === null ) {
2082                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2083                 }
2084
2085                 if ( $this->mPreparedEdit
2086                         && $this->mPreparedEdit->newContent
2087                         && $this->mPreparedEdit->newContent->equals( $content )
2088                         && $this->mPreparedEdit->revid == $revid
2089                         && $this->mPreparedEdit->format == $serialFormat
2090                         // XXX: also check $user here?
2091                 ) {
2092                         // Already prepared
2093                         return $this->mPreparedEdit;
2094                 }
2095
2096                 // The edit may have already been prepared via api.php?action=stashedit
2097                 $cachedEdit = $useCache && $wgAjaxEditStash
2098                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2099                         : false;
2100
2101                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2102                 Hooks::run( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2103
2104                 $edit = (object)array();
2105                 if ( $cachedEdit ) {
2106                         $edit->timestamp = $cachedEdit->timestamp;
2107                 } else {
2108                         $edit->timestamp = wfTimestampNow();
2109                 }
2110                 // @note: $cachedEdit is not used if the rev ID was referenced in the text
2111                 $edit->revid = $revid;
2112
2113                 if ( $cachedEdit ) {
2114                         $edit->pstContent = $cachedEdit->pstContent;
2115                 } else {
2116                         $edit->pstContent = $content
2117                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2118                                 : null;
2119                 }
2120
2121                 $edit->format = $serialFormat;
2122                 $edit->popts = $this->makeParserOptions( 'canonical' );
2123                 if ( $cachedEdit ) {
2124                         $edit->output = $cachedEdit->output;
2125                 } else {
2126                         if ( $revision ) {
2127                                 // We get here if vary-revision is set. This means that this page references
2128                                 // itself (such as via self-transclusion). In this case, we need to make sure
2129                                 // that any such self-references refer to the newly-saved revision, and not
2130                                 // to the previous one, which could otherwise happen due to slave lag.
2131                                 $oldCallback = $edit->popts->setCurrentRevisionCallback(
2132                                         function ( $title, $parser = false ) use ( $revision, &$oldCallback ) {
2133                                                 if ( $title->equals( $revision->getTitle() ) ) {
2134                                                         return $revision;
2135                                                 } else {
2136                                                         return call_user_func(
2137                                                                 $oldCallback,
2138                                                                 $title,
2139                                                                 $parser
2140                                                         );
2141                                                 }
2142                                         }
2143                                 );
2144                         }
2145                         $edit->output = $edit->pstContent
2146                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2147                                 : null;
2148                 }
2149
2150                 $edit->newContent = $content;
2151                 $edit->oldContent = $this->getContent( Revision::RAW );
2152
2153                 // NOTE: B/C for hooks! don't use these fields!
2154                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2155                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2156                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2157
2158                 $this->mPreparedEdit = $edit;
2159                 return $edit;
2160         }
2161
2162         /**
2163          * Do standard deferred updates after page edit.
2164          * Update links tables, site stats, search index and message cache.
2165          * Purges pages that include this page if the text was changed here.
2166          * Every 100th edit, prune the recent changes table.
2167          *
2168          * @param Revision $revision
2169          * @param User $user User object that did the revision
2170          * @param array $options Array of options, following indexes are used:
2171          * - changed: boolean, whether the revision changed the content (default true)
2172          * - created: boolean, whether the revision created the page (default false)
2173          * - moved: boolean, whether the page was moved (default false)
2174          * - oldcountable: boolean, null, or string 'no-change' (default null):
2175          *   - boolean: whether the page was counted as an article before that
2176          *     revision, only used in changed is true and created is false
2177          *   - null: if created is false, don't update the article count; if created
2178          *     is true, do update the article count
2179          *   - 'no-change': don't update the article count, ever
2180          */
2181         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2182                 global $wgEnableParserCache;
2183
2184                 $options += array(
2185                         'changed' => true,
2186                         'created' => false,
2187                         'moved' => false,
2188                         'oldcountable' => null
2189                 );
2190                 $content = $revision->getContent();
2191
2192                 // Parse the text
2193                 // Be careful not to do pre-save transform twice: $text is usually
2194                 // already pre-save transformed once.
2195                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2196                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2197                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user );
2198                 } else {
2199                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2200                         $editInfo = $this->mPreparedEdit;
2201                 }
2202
2203                 // Save it to the parser cache
2204                 if ( $wgEnableParserCache ) {
2205                         $parserCache = ParserCache::singleton();
2206                         $parserCache->save(
2207                                 $editInfo->output, $this, $editInfo->popts, $editInfo->timestamp, $editInfo->revid
2208                         );
2209                 }
2210
2211                 // Update the links tables and other secondary data
2212                 if ( $content ) {
2213                         $recursive = $options['changed']; // bug 50785
2214                         $updates = $content->getSecondaryDataUpdates(
2215                                 $this->getTitle(), null, $recursive, $editInfo->output );
2216                         DataUpdate::runUpdates( $updates );
2217                 }
2218
2219                 Hooks::run( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2220
2221                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2222                         // Flush old entries from the `recentchanges` table
2223                         JobQueueGroup::singleton()->push( RecentChangesUpdateJob::newPurgeJob() );
2224                 }
2225
2226                 if ( !$this->exists() ) {
2227                         return;
2228                 }
2229
2230                 $id = $this->getId();
2231                 $title = $this->mTitle->getPrefixedDBkey();
2232                 $shortTitle = $this->mTitle->getDBkey();
2233
2234                 if ( $options['oldcountable'] === 'no-change' ||
2235                         ( !$options['changed'] && !$options['moved'] )
2236                 ) {
2237                         $good = 0;
2238                 } elseif ( $options['created'] ) {
2239                         $good = (int)$this->isCountable( $editInfo );
2240                 } elseif ( $options['oldcountable'] !== null ) {
2241                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2242                 } else {
2243                         $good = 0;
2244                 }
2245                 $edits = $options['changed'] ? 1 : 0;
2246                 $total = $options['created'] ? 1 : 0;
2247
2248                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2249                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2250
2251                 // If this is another user's talk page, update newtalk.
2252                 // Don't do this if $options['changed'] = false (null-edits) nor if
2253                 // it's a minor edit and the user doesn't want notifications for those.
2254                 if ( $options['changed']
2255                         && $this->mTitle->getNamespace() == NS_USER_TALK
2256                         && $shortTitle != $user->getTitleKey()
2257                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2258                 ) {
2259                         $recipient = User::newFromName( $shortTitle, false );
2260                         if ( !$recipient ) {
2261                                 wfDebug( __METHOD__ . ": invalid username\n" );
2262                         } else {
2263                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2264                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2265                                         if ( User::isIP( $shortTitle ) ) {
2266                                                 // An anonymous user
2267                                                 $recipient->setNewtalk( true, $revision );
2268                                         } elseif ( $recipient->isLoggedIn() ) {
2269                                                 $recipient->setNewtalk( true, $revision );
2270                                         } else {
2271                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2272                                         }
2273                                 }
2274                         }
2275                 }
2276
2277                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2278                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2279                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2280                         if ( $msgtext === false || $msgtext === null ) {
2281                                 $msgtext = '';
2282                         }
2283
2284                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2285                 }
2286
2287                 if ( $options['created'] ) {
2288                         self::onArticleCreate( $this->mTitle );
2289                 } elseif ( $options['changed'] ) { // bug 50785
2290                         self::onArticleEdit( $this->mTitle );
2291                 }
2292
2293         }
2294
2295         /**
2296          * Edit an article without doing all that other stuff
2297          * The article must already exist; link tables etc
2298          * are not updated, caches are not flushed.
2299          *
2300          * @param string $text Text submitted
2301          * @param User $user The relevant user
2302          * @param string $comment Comment submitted
2303          * @param bool $minor Whereas it's a minor modification
2304          *
2305          * @deprecated since 1.21, use doEditContent() instead.
2306          */
2307         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2308                 ContentHandler::deprecated( __METHOD__, "1.21" );
2309
2310                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2311                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2312         }
2313
2314         /**
2315          * Edit an article without doing all that other stuff
2316          * The article must already exist; link tables etc
2317          * are not updated, caches are not flushed.
2318          *
2319          * @param Content $content Content submitted
2320          * @param User $user The relevant user
2321          * @param string $comment Comment submitted
2322          * @param bool $minor Whereas it's a minor modification
2323          * @param string $serialFormat Format for storing the content in the database
2324          */
2325         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2326                 $serialFormat = null
2327         ) {
2328
2329                 $serialized = $content->serialize( $serialFormat );
2330
2331                 $dbw = wfGetDB( DB_MASTER );
2332                 $revision = new Revision( array(
2333                         'title'      => $this->getTitle(), // for determining the default content model
2334                         'page'       => $this->getId(),
2335                         'user_text'  => $user->getName(),
2336                         'user'       => $user->getId(),
2337                         'text'       => $serialized,
2338                         'length'     => $content->getSize(),
2339                         'comment'    => $comment,
2340                         'minor_edit' => $minor ? 1 : 0,
2341                 ) ); // XXX: set the content object?
2342                 $revision->insertOn( $dbw );
2343                 $this->updateRevisionOn( $dbw, $revision );
2344
2345                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2346
2347         }
2348
2349         /**
2350          * Update the article's restriction field, and leave a log entry.
2351          * This works for protection both existing and non-existing pages.
2352          *
2353          * @param array $limit Set of restriction keys
2354          * @param array $expiry Per restriction type expiration
2355          * @param int &$cascade Set to false if cascading protection isn't allowed.
2356          * @param string $reason
2357          * @param User $user The user updating the restrictions
2358          * @return Status
2359          */
2360         public function doUpdateRestrictions( array $limit, array $expiry,
2361                 &$cascade, $reason, User $user
2362         ) {
2363                 global $wgCascadingRestrictionLevels, $wgContLang;
2364
2365                 if ( wfReadOnly() ) {
2366                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2367                 }
2368
2369                 $this->loadPageData( 'fromdbmaster' );
2370                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2371                 $id = $this->getId();
2372
2373                 if ( !$cascade ) {
2374                         $cascade = false;
2375                 }
2376
2377                 // Take this opportunity to purge out expired restrictions
2378                 Title::purgeExpiredRestrictions();
2379
2380                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2381                 // we expect a single selection, but the schema allows otherwise.
2382                 $isProtected = false;
2383                 $protect = false;
2384                 $changed = false;
2385
2386                 $dbw = wfGetDB( DB_MASTER );
2387
2388                 foreach ( $restrictionTypes as $action ) {
2389                         if ( !isset( $expiry[$action] ) ) {
2390                                 $expiry[$action] = $dbw->getInfinity();
2391                         }
2392                         if ( !isset( $limit[$action] ) ) {
2393                                 $limit[$action] = '';
2394                         } elseif ( $limit[$action] != '' ) {
2395                                 $protect = true;
2396                         }
2397
2398                         // Get current restrictions on $action
2399                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2400                         if ( $current != '' ) {
2401                                 $isProtected = true;
2402                         }
2403
2404                         if ( $limit[$action] != $current ) {
2405                                 $changed = true;
2406                         } elseif ( $limit[$action] != '' ) {
2407                                 // Only check expiry change if the action is actually being
2408                                 // protected, since expiry does nothing on an not-protected
2409                                 // action.
2410                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2411                                         $changed = true;
2412                                 }
2413                         }
2414                 }
2415
2416                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2417                         $changed = true;
2418                 }
2419
2420                 // If nothing has changed, do nothing
2421                 if ( !$changed ) {
2422                         return Status::newGood();
2423                 }
2424
2425                 if ( !$protect ) { // No protection at all means unprotection
2426                         $revCommentMsg = 'unprotectedarticle';
2427                         $logAction = 'unprotect';
2428                 } elseif ( $isProtected ) {
2429                         $revCommentMsg = 'modifiedarticleprotection';
2430                         $logAction = 'modify';
2431                 } else {
2432                         $revCommentMsg = 'protectedarticle';
2433                         $logAction = 'protect';
2434                 }
2435
2436                 // Truncate for whole multibyte characters
2437                 $reason = $wgContLang->truncate( $reason, 255 );
2438
2439                 $logRelationsValues = array();
2440                 $logRelationsField = null;
2441
2442                 if ( $id ) { // Protection of existing page
2443                         if ( !Hooks::run( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2444                                 return Status::newGood();
2445                         }
2446
2447                         // Only certain restrictions can cascade...
2448                         $editrestriction = isset( $limit['edit'] )
2449                                 ? array( $limit['edit'] )
2450                                 : $this->mTitle->getRestrictions( 'edit' );
2451                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2452                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2453                         }
2454                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2455                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2456                         }
2457
2458                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2459                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2460                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2461                         }
2462                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2463                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2464                         }
2465
2466                         // The schema allows multiple restrictions
2467                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2468                                 $cascade = false;
2469                         }
2470
2471                         // insert null revision to identify the page protection change as edit summary
2472                         $latest = $this->getLatest();
2473                         $nullRevision = $this->insertProtectNullRevision(
2474                                 $revCommentMsg,
2475                                 $limit,
2476                                 $expiry,
2477                                 $cascade,
2478                                 $reason,
2479                                 $user
2480                         );
2481
2482                         if ( $nullRevision === null ) {
2483                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2484                         }
2485
2486                         $logRelationsField = 'pr_id';
2487
2488                         // Update restrictions table
2489                         foreach ( $limit as $action => $restrictions ) {
2490                                 $dbw->delete(
2491                                         'page_restrictions',
2492                                         array(
2493                                                 'pr_page' => $id,
2494                                                 'pr_type' => $action
2495                                         ),
2496                                         __METHOD__
2497                                 );
2498                                 if ( $restrictions != '' ) {
2499                                         $dbw->insert(
2500                                                 'page_restrictions',
2501                                                 array(
2502                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2503                                                         'pr_page' => $id,
2504                                                         'pr_type' => $action,
2505                                                         'pr_level' => $restrictions,
2506                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2507                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2508                                                 ),
2509                                                 __METHOD__
2510                                         );
2511                                         $logRelationsValues[] = $dbw->insertId();
2512                                 }
2513                         }
2514
2515                         // Clear out legacy restriction fields
2516                         $dbw->update(
2517                                 'page',
2518                                 array( 'page_restrictions' => '' ),
2519                                 array( 'page_id' => $id ),
2520                                 __METHOD__
2521                         );
2522
2523                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2524                         Hooks::run( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2525                 } else { // Protection of non-existing page (also known as "title protection")
2526                         // Cascade protection is meaningless in this case
2527                         $cascade = false;
2528
2529                         if ( $limit['create'] != '' ) {
2530                                 $dbw->replace( 'protected_titles',
2531                                         array( array( 'pt_namespace', 'pt_title' ) ),
2532                                         array(
2533                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2534                                                 'pt_title' => $this->mTitle->getDBkey(),
2535                                                 'pt_create_perm' => $limit['create'],
2536                                                 'pt_timestamp' => $dbw->timestamp(),
2537                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2538                                                 'pt_user' => $user->getId(),
2539                                                 'pt_reason' => $reason,
2540                                         ), __METHOD__
2541                                 );
2542                         } else {
2543                                 $dbw->delete( 'protected_titles',
2544                                         array(
2545                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2546                                                 'pt_title' => $this->mTitle->getDBkey()
2547                                         ), __METHOD__
2548                                 );
2549                         }
2550                 }
2551
2552                 $this->mTitle->flushRestrictions();
2553                 InfoAction::invalidateCache( $this->mTitle );
2554
2555                 if ( $logAction == 'unprotect' ) {
2556                         $params = array();
2557                 } else {
2558                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2559                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2560                 }
2561
2562                 // Update the protection log
2563                 $log = new LogPage( 'protect' );
2564                 $logId = $log->addEntry( $logAction, $this->mTitle, $reason, $params, $user );
2565                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2566                         $log->addRelations( $logRelationsField, $logRelationsValues, $logId );
2567                 }
2568
2569                 return Status::newGood();
2570         }
2571
2572         /**
2573          * Insert a new null revision for this page.
2574          *
2575          * @param string $revCommentMsg Comment message key for the revision
2576          * @param array $limit Set of restriction keys
2577          * @param array $expiry Per restriction type expiration
2578          * @param int $cascade Set to false if cascading protection isn't allowed.
2579          * @param string $reason
2580          * @param User|null $user
2581          * @return Revision|null Null on error
2582          */
2583         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2584                 array $expiry, $cascade, $reason, $user = null
2585         ) {
2586                 global $wgContLang;
2587                 $dbw = wfGetDB( DB_MASTER );
2588
2589                 // Prepare a null revision to be added to the history
2590                 $editComment = $wgContLang->ucfirst(
2591                         wfMessage(
2592                                 $revCommentMsg,
2593                                 $this->mTitle->getPrefixedText()
2594                         )->inContentLanguage()->text()
2595                 );
2596                 if ( $reason ) {
2597                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2598                 }
2599                 $protectDescription = $this->protectDescription( $limit, $expiry );
2600                 if ( $protectDescription ) {
2601                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2602                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2603                                 ->inContentLanguage()->text();
2604                 }
2605                 if ( $cascade ) {
2606                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2607                         $editComment .= wfMessage( 'brackets' )->params(
2608                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2609                         )->inContentLanguage()->text();
2610                 }
2611
2612                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2613                 if ( $nullRev ) {
2614                         $nullRev->insertOn( $dbw );
2615
2616                         // Update page record and touch page
2617                         $oldLatest = $nullRev->getParentId();
2618                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2619                 }
2620
2621                 return $nullRev;
2622         }
2623
2624         /**
2625          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2626          * @return string
2627          */
2628         protected function formatExpiry( $expiry ) {
2629                 global $wgContLang;
2630                 $dbr = wfGetDB( DB_SLAVE );
2631
2632                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2633                 if ( $encodedExpiry != 'infinity' ) {
2634                         return wfMessage(
2635                                 'protect-expiring',
2636                                 $wgContLang->timeanddate( $expiry, false, false ),
2637                                 $wgContLang->date( $expiry, false, false ),
2638                                 $wgContLang->time( $expiry, false, false )
2639                         )->inContentLanguage()->text();
2640                 } else {
2641                         return wfMessage( 'protect-expiry-indefinite' )
2642                                 ->inContentLanguage()->text();
2643                 }
2644         }
2645
2646         /**
2647          * Builds the description to serve as comment for the edit.
2648          *
2649          * @param array $limit Set of restriction keys
2650          * @param array $expiry Per restriction type expiration
2651          * @return string
2652          */
2653         public function protectDescription( array $limit, array $expiry ) {
2654                 $protectDescription = '';
2655
2656                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2657                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2658                         # All possible message keys are listed here for easier grepping:
2659                         # * restriction-create
2660                         # * restriction-edit
2661                         # * restriction-move
2662                         # * restriction-upload
2663                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2664                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2665                         # with '' filtered out. All possible message keys are listed below:
2666                         # * protect-level-autoconfirmed
2667                         # * protect-level-sysop
2668                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2669
2670                         $expiryText = $this->formatExpiry( $expiry[$action] );
2671
2672                         if ( $protectDescription !== '' ) {
2673                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2674                         }
2675                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2676                                 ->params( $actionText, $restrictionsText, $expiryText )
2677                                 ->inContentLanguage()->text();
2678                 }
2679
2680                 return $protectDescription;
2681         }
2682
2683         /**
2684          * Builds the description to serve as comment for the log entry.
2685          *
2686          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2687          * protect description text. Keep them in old format to avoid breaking compatibility.
2688          * TODO: Fix protection log to store structured description and format it on-the-fly.
2689          *
2690          * @param array $limit Set of restriction keys
2691          * @param array $expiry Per restriction type expiration
2692          * @return string
2693          */
2694         public function protectDescriptionLog( array $limit, array $expiry ) {
2695                 global $wgContLang;
2696
2697                 $protectDescriptionLog = '';
2698
2699                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2700                         $expiryText = $this->formatExpiry( $expiry[$action] );
2701                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2702                 }
2703
2704                 return trim( $protectDescriptionLog );
2705         }
2706
2707         /**
2708          * Take an array of page restrictions and flatten it to a string
2709          * suitable for insertion into the page_restrictions field.
2710          *
2711          * @param string[] $limit
2712          *
2713          * @throws MWException
2714          * @return string
2715          */
2716         protected static function flattenRestrictions( $limit ) {
2717                 if ( !is_array( $limit ) ) {
2718                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2719                 }
2720
2721                 $bits = array();
2722                 ksort( $limit );
2723
2724                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2725                         $bits[] = "$action=$restrictions";
2726                 }
2727
2728                 return implode( ':', $bits );
2729         }
2730
2731         /**
2732          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2733          * backwards compatibility, if you care about error reporting you should use
2734          * doDeleteArticleReal() instead.
2735          *
2736          * Deletes the article with database consistency, writes logs, purges caches
2737          *
2738          * @param string $reason Delete reason for deletion log
2739          * @param bool $suppress Suppress all revisions and log the deletion in
2740          *        the suppression log instead of the deletion log
2741          * @param int $id Article ID
2742          * @param bool $commit Defaults to true, triggers transaction end
2743          * @param array &$error Array of errors to append to
2744          * @param User $user The deleting user
2745          * @return bool True if successful
2746          */
2747         public function doDeleteArticle(
2748                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2749         ) {
2750                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2751                 return $status->isGood();
2752         }
2753
2754         /**
2755          * Back-end article deletion
2756          * Deletes the article with database consistency, writes logs, purges caches
2757          *
2758          * @since 1.19
2759          *
2760          * @param string $reason Delete reason for deletion log
2761          * @param bool $suppress Suppress all revisions and log the deletion in
2762          *   the suppression log instead of the deletion log
2763          * @param int $id Article ID
2764          * @param bool $commit Defaults to true, triggers transaction end
2765          * @param array &$error Array of errors to append to
2766          * @param User $user The deleting user
2767          * @return Status Status object; if successful, $status->value is the log_id of the
2768          *   deletion log entry. If the page couldn't be deleted because it wasn't
2769          *   found, $status is a non-fatal 'cannotdelete' error
2770          */
2771         public function doDeleteArticleReal(
2772                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2773         ) {
2774                 global $wgUser, $wgContentHandlerUseDB;
2775
2776                 wfDebug( __METHOD__ . "\n" );
2777
2778                 $status = Status::newGood();
2779
2780                 if ( $this->mTitle->getDBkey() === '' ) {
2781                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2782                         return $status;
2783                 }
2784
2785                 $user = is_null( $user ) ? $wgUser : $user;
2786                 if ( !Hooks::run( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2787                         if ( $status->isOK() ) {
2788                                 // Hook aborted but didn't set a fatal status
2789                                 $status->fatal( 'delete-hook-aborted' );
2790                         }
2791                         return $status;
2792                 }
2793
2794                 $dbw = wfGetDB( DB_MASTER );
2795                 $dbw->begin( __METHOD__ );
2796
2797                 if ( $id == 0 ) {
2798                         $this->loadPageData( 'forupdate' );
2799                         $id = $this->getID();
2800                         if ( $id == 0 ) {
2801                                 $dbw->rollback( __METHOD__ );
2802                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2803                                 return $status;
2804                         }
2805                 }
2806
2807                 // we need to remember the old content so we can use it to generate all deletion updates.
2808                 $content = $this->getContent( Revision::RAW );
2809
2810                 // Bitfields to further suppress the content
2811                 if ( $suppress ) {
2812                         $bitfield = 0;
2813                         // This should be 15...
2814                         $bitfield |= Revision::DELETED_TEXT;
2815                         $bitfield |= Revision::DELETED_COMMENT;
2816                         $bitfield |= Revision::DELETED_USER;
2817                         $bitfield |= Revision::DELETED_RESTRICTED;
2818                 } else {
2819                         $bitfield = 'rev_deleted';
2820                 }
2821
2822                 // For now, shunt the revision data into the archive table.
2823                 // Text is *not* removed from the text table; bulk storage
2824                 // is left intact to avoid breaking block-compression or
2825                 // immutable storage schemes.
2826                 //
2827                 // For backwards compatibility, note that some older archive
2828                 // table entries will have ar_text and ar_flags fields still.
2829                 //
2830                 // In the future, we may keep revisions and mark them with
2831                 // the rev_deleted field, which is reserved for this purpose.
2832
2833                 $row = array(
2834                         'ar_namespace'  => 'page_namespace',
2835                         'ar_title'      => 'page_title',
2836                         'ar_comment'    => 'rev_comment',
2837                         'ar_user'       => 'rev_user',
2838                         'ar_user_text'  => 'rev_user_text',
2839                         'ar_timestamp'  => 'rev_timestamp',
2840                         'ar_minor_edit' => 'rev_minor_edit',
2841                         'ar_rev_id'     => 'rev_id',
2842                         'ar_parent_id'  => 'rev_parent_id',
2843                         'ar_text_id'    => 'rev_text_id',
2844                         'ar_text'       => '\'\'', // Be explicit to appease
2845                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2846                         'ar_len'        => 'rev_len',
2847                         'ar_page_id'    => 'page_id',
2848                         'ar_deleted'    => $bitfield,
2849                         'ar_sha1'       => 'rev_sha1',
2850                 );
2851
2852                 if ( $wgContentHandlerUseDB ) {
2853                         $row['ar_content_model'] = 'rev_content_model';
2854                         $row['ar_content_format'] = 'rev_content_format';
2855                 }
2856
2857                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2858                         $row,
2859                         array(
2860                                 'page_id' => $id,
2861                                 'page_id = rev_page'
2862                         ), __METHOD__
2863                 );
2864
2865                 // Now that it's safely backed up, delete it
2866                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2867                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2868
2869                 if ( !$ok ) {
2870                         $dbw->rollback( __METHOD__ );
2871                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2872                         return $status;
2873                 }
2874
2875                 if ( !$dbw->cascadingDeletes() ) {
2876                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2877                 }
2878
2879                 // Clone the title, so we have the information we need when we log
2880                 $logTitle = clone $this->mTitle;
2881
2882                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2883                 $logtype = $suppress ? 'suppress' : 'delete';
2884
2885                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2886                 $logEntry->setPerformer( $user );
2887                 $logEntry->setTarget( $logTitle );
2888                 $logEntry->setComment( $reason );
2889                 $logid = $logEntry->insert();
2890
2891                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
2892                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2893                         $logEntry->publish( $logid );
2894                 } );
2895
2896                 if ( $commit ) {
2897                         $dbw->commit( __METHOD__ );
2898                 }
2899
2900                 $this->doDeleteUpdates( $id, $content );
2901
2902                 Hooks::run( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2903                 $status->value = $logid;
2904                 return $status;
2905         }
2906
2907         /**
2908          * Do some database updates after deletion
2909          *
2910          * @param int $id The page_id value of the page being deleted
2911          * @param Content $content Optional page content to be used when determining
2912          *   the required updates. This may be needed because $this->getContent()
2913          *   may already return null when the page proper was deleted.
2914          */
2915         public function doDeleteUpdates( $id, Content $content = null ) {
2916                 // update site status
2917                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2918
2919                 // remove secondary indexes, etc
2920                 $updates = $this->getDeletionUpdates( $content );
2921                 DataUpdate::runUpdates( $updates );
2922
2923                 // Reparse any pages transcluding this page
2924                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2925
2926                 // Reparse any pages including this image
2927                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2928                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2929                 }
2930
2931                 // Clear caches
2932                 WikiPage::onArticleDelete( $this->mTitle );
2933
2934                 // Reset this object and the Title object
2935                 $this->loadFromRow( false, self::READ_LATEST );
2936
2937                 // Search engine
2938                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2939         }
2940
2941         /**
2942          * Roll back the most recent consecutive set of edits to a page
2943          * from the same user; fails if there are no eligible edits to
2944          * roll back to, e.g. user is the sole contributor. This function
2945          * performs permissions checks on $user, then calls commitRollback()
2946          * to do the dirty work
2947          *
2948          * @todo Separate the business/permission stuff out from backend code
2949          *
2950          * @param string $fromP Name of the user whose edits to rollback.
2951          * @param string $summary Custom summary. Set to default summary if empty.
2952          * @param string $token Rollback token.
2953          * @param bool $bot If true, mark all reverted edits as bot.
2954          *
2955          * @param array $resultDetails Array contains result-specific array of additional values
2956          *    'alreadyrolled' : 'current' (rev)
2957          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2958          *
2959          * @param User $user The user performing the rollback
2960          * @return array Array of errors, each error formatted as
2961          *   array(messagekey, param1, param2, ...).
2962          * On success, the array is empty.  This array can also be passed to
2963          * OutputPage::showPermissionsErrorPage().
2964          */
2965         public function doRollback(
2966                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2967         ) {
2968                 $resultDetails = null;
2969
2970                 // Check permissions
2971                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2972                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2973                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2974
2975                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2976                         $errors[] = array( 'sessionfailure' );
2977                 }
2978
2979                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2980                         $errors[] = array( 'actionthrottledtext' );
2981                 }
2982
2983                 // If there were errors, bail out now
2984                 if ( !empty( $errors ) ) {
2985                         return $errors;
2986                 }
2987
2988                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2989         }
2990
2991         /**
2992          * Backend implementation of doRollback(), please refer there for parameter
2993          * and return value documentation
2994          *
2995          * NOTE: This function does NOT check ANY permissions, it just commits the
2996          * rollback to the DB. Therefore, you should only call this function direct-
2997          * ly if you want to use custom permissions checks. If you don't, use
2998          * doRollback() instead.
2999          * @param string $fromP Name of the user whose edits to rollback.
3000          * @param string $summary Custom summary. Set to default summary if empty.
3001          * @param bool $bot If true, mark all reverted edits as bot.
3002          *
3003          * @param array $resultDetails Contains result-specific array of additional values
3004          * @param User $guser The user performing the rollback
3005          * @return array
3006          */
3007         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
3008                 global $wgUseRCPatrol, $wgContLang;
3009
3010                 $dbw = wfGetDB( DB_MASTER );
3011
3012                 if ( wfReadOnly() ) {
3013                         return array( array( 'readonlytext' ) );
3014                 }
3015
3016                 // Get the last editor
3017                 $current = $this->getRevision();
3018                 if ( is_null( $current ) ) {
3019                         // Something wrong... no page?
3020                         return array( array( 'notanarticle' ) );
3021                 }
3022
3023                 $from = str_replace( '_', ' ', $fromP );
3024                 // User name given should match up with the top revision.
3025                 // If the user was deleted then $from should be empty.
3026                 if ( $from != $current->getUserText() ) {
3027                         $resultDetails = array( 'current' => $current );
3028                         return array( array( 'alreadyrolled',
3029                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3030                                 htmlspecialchars( $fromP ),
3031                                 htmlspecialchars( $current->getUserText() )
3032                         ) );
3033                 }
3034
3035                 // Get the last edit not by this guy...
3036                 // Note: these may not be public values
3037                 $user = intval( $current->getUser( Revision::RAW ) );
3038                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3039                 $s = $dbw->selectRow( 'revision',
3040                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3041                         array( 'rev_page' => $current->getPage(),
3042                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3043                         ), __METHOD__,
3044                         array( 'USE INDEX' => 'page_timestamp',
3045                                 'ORDER BY' => 'rev_timestamp DESC' )
3046                         );
3047                 if ( $s === false ) {
3048                         // No one else ever edited this page
3049                         return array( array( 'cantrollback' ) );
3050                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3051                         || $s->rev_deleted & Revision::DELETED_USER
3052                 ) {
3053                         // Only admins can see this text
3054                         return array( array( 'notvisiblerev' ) );
3055                 }
3056
3057                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3058                 // This is done before the rollback edit to have patrolling also on failure (bug 62157).
3059                 $set = array();
3060                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3061                         // Mark all reverted edits as bot
3062                         $set['rc_bot'] = 1;
3063                 }
3064
3065                 if ( $wgUseRCPatrol ) {
3066                         // Mark all reverted edits as patrolled
3067                         $set['rc_patrolled'] = 1;
3068                 }
3069
3070                 if ( count( $set ) ) {
3071                         $dbw->update( 'recentchanges', $set,
3072                                 array( /* WHERE */
3073                                         'rc_cur_id' => $current->getPage(),
3074                                         'rc_user_text' => $current->getUserText(),
3075                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3076                                 ), __METHOD__
3077                         );
3078                 }
3079
3080                 // Generate the edit summary if necessary
3081                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3082                 if ( empty( $summary ) ) {
3083                         if ( $from == '' ) { // no public user name
3084                                 $summary = wfMessage( 'revertpage-nouser' );
3085                         } else {
3086                                 $summary = wfMessage( 'revertpage' );
3087                         }
3088                 }
3089
3090                 // Allow the custom summary to use the same args as the default message
3091                 $args = array(
3092                         $target->getUserText(), $from, $s->rev_id,
3093                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3094                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3095                 );
3096                 if ( $summary instanceof Message ) {
3097                         $summary = $summary->params( $args )->inContentLanguage()->text();
3098                 } else {
3099                         $summary = wfMsgReplaceArgs( $summary, $args );
3100                 }
3101
3102                 // Trim spaces on user supplied text
3103                 $summary = trim( $summary );
3104
3105                 // Truncate for whole multibyte characters.
3106                 $summary = $wgContLang->truncate( $summary, 255 );
3107
3108                 // Save
3109                 $flags = EDIT_UPDATE;
3110
3111                 if ( $guser->isAllowed( 'minoredit' ) ) {
3112                         $flags |= EDIT_MINOR;
3113                 }
3114
3115                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3116                         $flags |= EDIT_FORCE_BOT;
3117                 }
3118
3119                 // Actually store the edit
3120                 $status = $this->doEditContent(
3121                         $target->getContent(),
3122                         $summary,
3123                         $flags,
3124                         $target->getId(),
3125                         $guser
3126                 );
3127
3128                 if ( !$status->isOK() ) {
3129                         return $status->getErrorsArray();
3130                 }
3131
3132                 // raise error, when the edit is an edit without a new version
3133                 if ( empty( $status->value['revision'] ) ) {
3134                         $resultDetails = array( 'current' => $current );
3135                         return array( array( 'alreadyrolled',
3136                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3137                                         htmlspecialchars( $fromP ),
3138                                         htmlspecialchars( $current->getUserText() )
3139                         ) );
3140                 }
3141
3142                 $revId = $status->value['revision']->getId();
3143
3144                 Hooks::run( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
3145
3146                 $resultDetails = array(
3147                         'summary' => $summary,
3148                         'current' => $current,
3149                         'target' => $target,
3150                         'newid' => $revId
3151                 );
3152
3153                 return array();
3154         }
3155
3156         /**
3157          * The onArticle*() functions are supposed to be a kind of hooks
3158          * which should be called whenever any of the specified actions
3159          * are done.
3160          *
3161          * This is a good place to put code to clear caches, for instance.
3162          *
3163          * This is called on page move and undelete, as well as edit
3164          *
3165          * @param Title $title
3166          */
3167         public static function onArticleCreate( 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                 $title->deleteTitleProtection();
3177         }
3178
3179         /**
3180          * Clears caches when article is deleted
3181          *
3182          * @param Title $title
3183          */
3184         public static function onArticleDelete( Title $title ) {
3185                 // Update existence markers on article/talk tabs...
3186                 $other = $title->getOtherPage();
3187
3188                 $other->invalidateCache();
3189                 $other->purgeSquid();
3190
3191                 $title->touchLinks();
3192                 $title->purgeSquid();
3193
3194                 // File cache
3195                 HTMLFileCache::clearFileCache( $title );
3196                 InfoAction::invalidateCache( $title );
3197
3198                 // Messages
3199                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3200                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3201                 }
3202
3203                 // Images
3204                 if ( $title->getNamespace() == NS_FILE ) {
3205                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3206                         $update->doUpdate();
3207                 }
3208
3209                 // User talk pages
3210                 if ( $title->getNamespace() == NS_USER_TALK ) {
3211                         $user = User::newFromName( $title->getText(), false );
3212                         if ( $user ) {
3213                                 $user->setNewtalk( false );
3214                         }
3215                 }
3216
3217                 // Image redirects
3218                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3219         }
3220
3221         /**
3222          * Purge caches on page update etc
3223          *
3224          * @param Title $title
3225          */
3226         public static function onArticleEdit( Title $title ) {
3227                 // Invalidate caches of articles which include this page
3228                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3229
3230                 // Invalidate the caches of all pages which redirect here
3231                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3232
3233                 // Purge squid for this page only
3234                 $title->purgeSquid();
3235
3236                 // Clear file cache for this page only
3237                 HTMLFileCache::clearFileCache( $title );
3238                 InfoAction::invalidateCache( $title );
3239         }
3240
3241         /**#@-*/
3242
3243         /**
3244          * Returns a list of categories this page is a member of.
3245          * Results will include hidden categories
3246          *
3247          * @return TitleArray
3248          */
3249         public function getCategories() {
3250                 $id = $this->getId();
3251                 if ( $id == 0 ) {
3252                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3253                 }
3254
3255                 $dbr = wfGetDB( DB_SLAVE );
3256                 $res = $dbr->select( 'categorylinks',
3257                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3258                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3259                         // as not being aliases, and NS_CATEGORY is numeric
3260                         array( 'cl_from' => $id ),
3261                         __METHOD__ );
3262
3263                 return TitleArray::newFromResult( $res );
3264         }
3265
3266         /**
3267          * Returns a list of hidden categories this page is a member of.
3268          * Uses the page_props and categorylinks tables.
3269          *
3270          * @return array Array of Title objects
3271          */
3272         public function getHiddenCategories() {
3273                 $result = array();
3274                 $id = $this->getId();
3275
3276                 if ( $id == 0 ) {
3277                         return array();
3278                 }
3279
3280                 $dbr = wfGetDB( DB_SLAVE );
3281                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3282                         array( 'cl_to' ),
3283                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3284                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3285                         __METHOD__ );
3286
3287                 if ( $res !== false ) {
3288                         foreach ( $res as $row ) {
3289                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3290                         }
3291                 }
3292
3293                 return $result;
3294         }
3295
3296         /**
3297          * Return an applicable autosummary if one exists for the given edit.
3298          * @param string|null $oldtext The previous text of the page.
3299          * @param string|null $newtext The submitted text of the page.
3300          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3301          * @return string An appropriate autosummary, or an empty string.
3302          *
3303          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3304          */
3305         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3306                 // NOTE: stub for backwards-compatibility. assumes the given text is
3307                 // wikitext. will break horribly if it isn't.
3308
3309                 ContentHandler::deprecated( __METHOD__, '1.21' );
3310
3311                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3312                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3313                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3314
3315                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3316         }
3317
3318         /**
3319          * Auto-generates a deletion reason
3320          *
3321          * @param bool &$hasHistory Whether the page has a history
3322          * @return string|bool String containing deletion reason or empty string, or boolean false
3323          *    if no revision occurred
3324          */
3325         public function getAutoDeleteReason( &$hasHistory ) {
3326                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3327         }
3328
3329         /**
3330          * Update all the appropriate counts in the category table, given that
3331          * we've added the categories $added and deleted the categories $deleted.
3332          *
3333          * @param array $added The names of categories that were added
3334          * @param array $deleted The names of categories that were deleted
3335          */
3336         public function updateCategoryCounts( array $added, array $deleted ) {
3337                 $that = $this;
3338                 $method = __METHOD__;
3339                 $dbw = wfGetDB( DB_MASTER );
3340
3341                 // Do this at the end of the commit to reduce lock wait timeouts
3342                 $dbw->onTransactionPreCommitOrIdle(
3343                         function () use ( $dbw, $that, $method, $added, $deleted ) {
3344                                 $ns = $that->getTitle()->getNamespace();
3345
3346                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3347                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3348                                 if ( $ns == NS_CATEGORY ) {
3349                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3350                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3351                                 } elseif ( $ns == NS_FILE ) {
3352                                         $addFields[] = 'cat_files = cat_files + 1';
3353                                         $removeFields[] = 'cat_files = cat_files - 1';
3354                                 }
3355
3356                                 if ( count( $added ) ) {
3357                                         $insertRows = array();
3358                                         foreach ( $added as $cat ) {
3359                                                 $insertRows[] = array(
3360                                                         'cat_title'   => $cat,
3361                                                         'cat_pages'   => 1,
3362                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3363                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3364                                                 );
3365                                         }
3366                                         $dbw->upsert(
3367                                                 'category',
3368                                                 $insertRows,
3369                                                 array( 'cat_title' ),
3370                                                 $addFields,
3371                                                 $method
3372                                         );
3373                                 }
3374
3375                                 if ( count( $deleted ) ) {
3376                                         $dbw->update(
3377                                                 'category',
3378                                                 $removeFields,
3379                                                 array( 'cat_title' => $deleted ),
3380                                                 $method
3381                                         );
3382                                 }
3383
3384                                 foreach ( $added as $catName ) {
3385                                         $cat = Category::newFromName( $catName );
3386                                         Hooks::run( 'CategoryAfterPageAdded', array( $cat, $that ) );
3387                                 }
3388
3389                                 foreach ( $deleted as $catName ) {
3390                                         $cat = Category::newFromName( $catName );
3391                                         Hooks::run( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3392                                 }
3393                         }
3394                 );
3395         }
3396
3397         /**
3398          * Opportunistically enqueue link update jobs given fresh parser output if useful
3399          *
3400          * @param ParserOutput $parserOutput Current version page output
3401          * @since 1.25
3402          */
3403         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3404                 if ( wfReadOnly() ) {
3405                         return;
3406                 }
3407
3408                 if ( !Hooks::run( 'OpportunisticLinksUpdate', array( $this, $this->mTitle, $parserOutput ) ) ) {
3409                         return;
3410                 }
3411
3412                 if ( $this->mTitle->areRestrictionsCascading() ) {
3413                         // If the page is cascade protecting, the links should really be up-to-date
3414                         $params = array( 'prioritize' => true );
3415                 } elseif ( $parserOutput->hasDynamicContent() ) {
3416                         // Assume the output contains time/random based magic words
3417                         $params = array();
3418                 } else {
3419                         // If the inclusions are deterministic, the edit-triggered link jobs are enough
3420                         return;
3421                 }
3422
3423                 // Check if the last link refresh was before page_touched
3424                 if ( $this->getLinksTimestamp() < $this->getTouched() ) {
3425                         JobQueueGroup::singleton()->push( EnqueueJob::newFromLocalJobs(
3426                                 new JobSpecification( 'refreshLinks', $params, array(), $this->mTitle )
3427                         ) );
3428                         return;
3429                 }
3430
3431                 return;
3432         }
3433
3434         /**
3435          * Return a list of templates used by this article.
3436          * Uses the templatelinks table
3437          *
3438          * @deprecated since 1.19; use Title::getTemplateLinksFrom()
3439          * @return array Array of Title objects
3440          */
3441         public function getUsedTemplates() {
3442                 return $this->mTitle->getTemplateLinksFrom();
3443         }
3444
3445         /**
3446          * This function is called right before saving the wikitext,
3447          * so we can do things like signatures and links-in-context.
3448          *
3449          * @deprecated since 1.19; use Parser::preSaveTransform() instead
3450          * @param string $text Article contents
3451          * @param User $user User doing the edit
3452          * @param ParserOptions $popts Parser options, default options for
3453          *   the user loaded if null given
3454          * @return string Article contents with altered wikitext markup (signatures
3455          *      converted, {{subst:}}, templates, etc.)
3456          */
3457         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3458                 global $wgParser, $wgUser;
3459
3460                 wfDeprecated( __METHOD__, '1.19' );
3461
3462                 $user = is_null( $user ) ? $wgUser : $user;
3463
3464                 if ( $popts === null ) {
3465                         $popts = ParserOptions::newFromUser( $user );
3466                 }
3467
3468                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3469         }
3470
3471         /**
3472          * Update the article's restriction field, and leave a log entry.
3473          *
3474          * @deprecated since 1.19
3475          * @param array $limit Set of restriction keys
3476          * @param string $reason
3477          * @param int &$cascade Set to false if cascading protection isn't allowed.
3478          * @param array $expiry Per restriction type expiration
3479          * @param User $user The user updating the restrictions
3480          * @return bool True on success
3481          */
3482         public function updateRestrictions(
3483                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3484         ) {
3485                 global $wgUser;
3486
3487                 $user = is_null( $user ) ? $wgUser : $user;
3488
3489                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3490         }
3491
3492         /**
3493          * Returns a list of updates to be performed when this page is deleted. The
3494          * updates should remove any information about this page from secondary data
3495          * stores such as links tables.
3496          *
3497          * @param Content|null $content Optional Content object for determining the
3498          *   necessary updates.
3499          * @return array An array of DataUpdates objects
3500          */
3501         public function getDeletionUpdates( Content $content = null ) {
3502                 if ( !$content ) {
3503                         // load content object, which may be used to determine the necessary updates
3504                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3505                         $content = $this->getContent( Revision::RAW );
3506                 }
3507
3508                 if ( !$content ) {
3509                         $updates = array();
3510                 } else {
3511                         $updates = $content->getDeletionUpdates( $this );
3512                 }
3513
3514                 Hooks::run( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3515                 return $updates;
3516         }
3517 }