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                         $dbr = wfGetDB( DB_SLAVE );
1517                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1518                         // Try the master if this thread may have just added it.
1519                         // This could be abstracted into a Revision method, but we don't want
1520                         // to encourage loading of revisions by timestamp.
1521                         if ( !$rev
1522                                 && wfGetLB()->getServerCount() > 1
1523                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1524                         ) {
1525                                 $dbw = wfGetDB( DB_MASTER );
1526                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1527                         }
1528                         if ( $rev ) {
1529                                 $baseRevId = $rev->getId();
1530                         }
1531                 }
1532
1533                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1534         }
1535
1536         /**
1537          * @param string|number|null|bool $sectionId Section identifier as a number or string
1538          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1539          * or 'new' for a new section.
1540          * @param Content $sectionContent New content of the section.
1541          * @param string $sectionTitle New section's subject, only if $section is "new".
1542          * @param int|null $baseRevId
1543          *
1544          * @throws MWException
1545          * @return Content New complete article content, or null if error.
1546          *
1547          * @since 1.24
1548          */
1549         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1550                 $sectionTitle = '', $baseRevId = null
1551         ) {
1552
1553                 if ( strval( $sectionId ) === '' ) {
1554                         // Whole-page edit; let the whole text through
1555                         $newContent = $sectionContent;
1556                 } else {
1557                         if ( !$this->supportsSections() ) {
1558                                 throw new MWException( "sections not supported for content model " .
1559                                         $this->getContentHandler()->getModelID() );
1560                         }
1561
1562                         // Bug 30711: always use current version when adding a new section
1563                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1564                                 $oldContent = $this->getContent();
1565                         } else {
1566                                 $rev = Revision::newFromId( $baseRevId );
1567                                 if ( !$rev ) {
1568                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1569                                                 $this->getId() . "; section: $sectionId)\n" );
1570                                         return null;
1571                                 }
1572
1573                                 $oldContent = $rev->getContent();
1574                         }
1575
1576                         if ( !$oldContent ) {
1577                                 wfDebug( __METHOD__ . ": no page text\n" );
1578                                 return null;
1579                         }
1580
1581                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1582                 }
1583
1584                 return $newContent;
1585         }
1586
1587         /**
1588          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1589          * @param int $flags
1590          * @return int Updated $flags
1591          */
1592         public function checkFlags( $flags ) {
1593                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1594                         if ( $this->exists() ) {
1595                                 $flags |= EDIT_UPDATE;
1596                         } else {
1597                                 $flags |= EDIT_NEW;
1598                         }
1599                 }
1600
1601                 return $flags;
1602         }
1603
1604         /**
1605          * Change an existing article or create a new article. Updates RC and all necessary caches,
1606          * optionally via the deferred update array.
1607          *
1608          * @param string $text New text
1609          * @param string $summary Edit summary
1610          * @param int $flags Bitfield:
1611          *      EDIT_NEW
1612          *          Article is known or assumed to be non-existent, create a new one
1613          *      EDIT_UPDATE
1614          *          Article is known or assumed to be pre-existing, update it
1615          *      EDIT_MINOR
1616          *          Mark this edit minor, if the user is allowed to do so
1617          *      EDIT_SUPPRESS_RC
1618          *          Do not log the change in recentchanges
1619          *      EDIT_FORCE_BOT
1620          *          Mark the edit a "bot" edit regardless of user rights
1621          *      EDIT_DEFER_UPDATES
1622          *          Defer some of the updates until the end of index.php
1623          *      EDIT_AUTOSUMMARY
1624          *          Fill in blank summaries with generated text where possible
1625          *
1626          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1627          * article will be detected. If EDIT_UPDATE is specified and the article
1628          * doesn't exist, the function will return an edit-gone-missing error. If
1629          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1630          * error will be returned. These two conditions are also possible with
1631          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1632          *
1633          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1634          *   This is not the parent revision ID, rather the revision ID for older
1635          *   content used as the source for a rollback, for example.
1636          * @param User $user The user doing the edit
1637          *
1638          * @throws MWException
1639          * @return Status Possible errors:
1640          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1641          *     set the fatal flag of $status
1642          *   edit-gone-missing: In update mode, but the article didn't exist.
1643          *   edit-conflict: In update mode, the article changed unexpectedly.
1644          *   edit-no-change: Warning that the text was the same as before.
1645          *   edit-already-exists: In creation mode, but the article already exists.
1646          *
1647          * Extensions may define additional errors.
1648          *
1649          * $return->value will contain an associative array with members as follows:
1650          *     new: Boolean indicating if the function attempted to create a new article.
1651          *     revision: The revision object for the inserted revision, or null.
1652          *
1653          * Compatibility note: this function previously returned a boolean value
1654          * indicating success/failure
1655          *
1656          * @deprecated since 1.21: use doEditContent() instead.
1657          */
1658         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1659                 ContentHandler::deprecated( __METHOD__, '1.21' );
1660
1661                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1662
1663                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1664         }
1665
1666         /**
1667          * Change an existing article or create a new article. Updates RC and all necessary caches,
1668          * optionally via the deferred update array.
1669          *
1670          * @param Content $content New content
1671          * @param string $summary Edit summary
1672          * @param int $flags Bitfield:
1673          *      EDIT_NEW
1674          *          Article is known or assumed to be non-existent, create a new one
1675          *      EDIT_UPDATE
1676          *          Article is known or assumed to be pre-existing, update it
1677          *      EDIT_MINOR
1678          *          Mark this edit minor, if the user is allowed to do so
1679          *      EDIT_SUPPRESS_RC
1680          *          Do not log the change in recentchanges
1681          *      EDIT_FORCE_BOT
1682          *          Mark the edit a "bot" edit regardless of user rights
1683          *      EDIT_DEFER_UPDATES
1684          *          Defer some of the updates until the end of index.php
1685          *      EDIT_AUTOSUMMARY
1686          *          Fill in blank summaries with generated text where possible
1687          *
1688          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1689          * article will be detected. If EDIT_UPDATE is specified and the article
1690          * doesn't exist, the function will return an edit-gone-missing error. If
1691          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1692          * error will be returned. These two conditions are also possible with
1693          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1694          *
1695          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1696          *   This is not the parent revision ID, rather the revision ID for older
1697          *   content used as the source for a rollback, for example.
1698          * @param User $user The user doing the edit
1699          * @param string $serialFormat Format for storing the content in the
1700          *   database.
1701          *
1702          * @throws MWException
1703          * @return Status Possible errors:
1704          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1705          *       set the fatal flag of $status.
1706          *     edit-gone-missing: In update mode, but the article didn't exist.
1707          *     edit-conflict: In update mode, the article changed unexpectedly.
1708          *     edit-no-change: Warning that the text was the same as before.
1709          *     edit-already-exists: In creation mode, but the article already exists.
1710          *
1711          *  Extensions may define additional errors.
1712          *
1713          *  $return->value will contain an associative array with members as follows:
1714          *     new: Boolean indicating if the function attempted to create a new article.
1715          *     revision: The revision object for the inserted revision, or null.
1716          *
1717          * @since 1.21
1718          */
1719         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1720                 User $user = null, $serialFormat = null
1721         ) {
1722                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1723
1724                 // Low-level sanity check
1725                 if ( $this->mTitle->getText() === '' ) {
1726                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1727                 }
1728
1729                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1730                         return Status::newFatal( 'content-not-allowed-here',
1731                                 ContentHandler::getLocalizedName( $content->getModel() ),
1732                                 $this->getTitle()->getPrefixedText() );
1733                 }
1734
1735                 $user = is_null( $user ) ? $wgUser : $user;
1736                 $status = Status::newGood( array() );
1737
1738                 // Load the data from the master database if needed.
1739                 // The caller may already loaded it from the master or even loaded it using
1740                 // SELECT FOR UPDATE, so do not override that using clear().
1741                 $this->loadPageData( 'fromdbmaster' );
1742
1743                 $flags = $this->checkFlags( $flags );
1744
1745                 // handle hook
1746                 $hook_args = array( &$this, &$user, &$content, &$summary,
1747                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1748
1749                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1750                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1751
1752                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1753
1754                         if ( $status->isOK() ) {
1755                                 $status->fatal( 'edit-hook-aborted' );
1756                         }
1757
1758                         return $status;
1759                 }
1760
1761                 // Silently ignore EDIT_MINOR if not allowed
1762                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1763                 $bot = $flags & EDIT_FORCE_BOT;
1764
1765                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1766
1767                 $oldsize = $old_content ? $old_content->getSize() : 0;
1768                 $oldid = $this->getLatest();
1769                 $oldIsRedirect = $this->isRedirect();
1770                 $oldcountable = $this->isCountable();
1771
1772                 $handler = $content->getContentHandler();
1773
1774                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1775                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1776                         if ( !$old_content ) {
1777                                 $old_content = null;
1778                         }
1779                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1780                 }
1781
1782                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat );
1783                 $serialized = $editInfo->pst;
1784
1785                 /**
1786                  * @var Content $content
1787                  */
1788                 $content = $editInfo->pstContent;
1789                 $newsize = $content->getSize();
1790
1791                 $dbw = wfGetDB( DB_MASTER );
1792                 $now = wfTimestampNow();
1793                 $this->mTimestamp = $now;
1794
1795                 if ( $flags & EDIT_UPDATE ) {
1796                         // Update article, but only if changed.
1797                         $status->value['new'] = false;
1798
1799                         if ( !$oldid ) {
1800                                 // Article gone missing
1801                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1802                                 $status->fatal( 'edit-gone-missing' );
1803
1804                                 return $status;
1805                         } elseif ( !$old_content ) {
1806                                 // Sanity check for bug 37225
1807                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1808                         }
1809
1810                         $revision = new Revision( array(
1811                                 'page'       => $this->getId(),
1812                                 'title'      => $this->getTitle(), // for determining the default content model
1813                                 'comment'    => $summary,
1814                                 'minor_edit' => $isminor,
1815                                 'text'       => $serialized,
1816                                 'len'        => $newsize,
1817                                 'parent_id'  => $oldid,
1818                                 'user'       => $user->getId(),
1819                                 'user_text'  => $user->getName(),
1820                                 'timestamp'  => $now,
1821                                 'content_model' => $content->getModel(),
1822                                 'content_format' => $serialFormat,
1823                         ) ); // XXX: pass content object?!
1824
1825                         $changed = !$content->equals( $old_content );
1826
1827                         if ( $changed ) {
1828                                 $dbw->begin( __METHOD__ );
1829                                 try {
1830
1831                                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1832                                         $status->merge( $prepStatus );
1833
1834                                         if ( !$status->isOK() ) {
1835                                                 $dbw->rollback( __METHOD__ );
1836
1837                                                 return $status;
1838                                         }
1839                                         $revisionId = $revision->insertOn( $dbw );
1840
1841                                         // Update page
1842                                         //
1843                                         // We check for conflicts by comparing $oldid with the current latest revision ID.
1844                                         $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1845
1846                                         if ( !$ok ) {
1847                                                 // Belated edit conflict! Run away!!
1848                                                 $status->fatal( 'edit-conflict' );
1849
1850                                                 $dbw->rollback( __METHOD__ );
1851
1852                                                 return $status;
1853                                         }
1854
1855                                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1856                                         // Update recentchanges
1857                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1858                                                 // Mark as patrolled if the user can do so
1859                                                 $patrolled = $wgUseRCPatrol && !count(
1860                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1861                                                 // Add RC row to the DB
1862                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1863                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1864                                                         $revisionId, $patrolled
1865                                                 );
1866
1867                                                 // Log auto-patrolled edits
1868                                                 if ( $patrolled ) {
1869                                                         PatrolLog::record( $rc, true, $user );
1870                                                 }
1871                                         }
1872                                         $user->incEditCount();
1873                                 } catch ( Exception $e ) {
1874                                         $dbw->rollback( __METHOD__ );
1875                                         // Question: Would it perhaps be better if this method turned all
1876                                         // exceptions into $status's?
1877                                         throw $e;
1878                                 }
1879                                 $dbw->commit( __METHOD__ );
1880                         } else {
1881                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1882                                 // related variables correctly
1883                                 $revision->setId( $this->getLatest() );
1884                         }
1885
1886                         // Update links tables, site stats, etc.
1887                         $this->doEditUpdates(
1888                                 $revision,
1889                                 $user,
1890                                 array(
1891                                         'changed' => $changed,
1892                                         'oldcountable' => $oldcountable
1893                                 )
1894                         );
1895
1896                         if ( !$changed ) {
1897                                 $status->warning( 'edit-no-change' );
1898                                 $revision = null;
1899                                 // Update page_touched, this is usually implicit in the page update
1900                                 // Other cache updates are done in onArticleEdit()
1901                                 $this->mTitle->invalidateCache();
1902                         }
1903                 } else {
1904                         // Create new article
1905                         $status->value['new'] = true;
1906
1907                         $dbw->begin( __METHOD__ );
1908                         try {
1909
1910                                 $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1911                                 $status->merge( $prepStatus );
1912
1913                                 if ( !$status->isOK() ) {
1914                                         $dbw->rollback( __METHOD__ );
1915
1916                                         return $status;
1917                                 }
1918
1919                                 $status->merge( $prepStatus );
1920
1921                                 // Add the page record; stake our claim on this title!
1922                                 // This will return false if the article already exists
1923                                 $newid = $this->insertOn( $dbw );
1924
1925                                 if ( $newid === false ) {
1926                                         $dbw->rollback( __METHOD__ );
1927                                         $status->fatal( 'edit-already-exists' );
1928
1929                                         return $status;
1930                                 }
1931
1932                                 // Save the revision text...
1933                                 $revision = new Revision( array(
1934                                         'page'       => $newid,
1935                                         'title'      => $this->getTitle(), // for determining the default content model
1936                                         'comment'    => $summary,
1937                                         'minor_edit' => $isminor,
1938                                         'text'       => $serialized,
1939                                         'len'        => $newsize,
1940                                         'user'       => $user->getId(),
1941                                         'user_text'  => $user->getName(),
1942                                         'timestamp'  => $now,
1943                                         'content_model' => $content->getModel(),
1944                                         'content_format' => $serialFormat,
1945                                 ) );
1946                                 $revisionId = $revision->insertOn( $dbw );
1947
1948                                 // Bug 37225: use accessor to get the text as Revision may trim it
1949                                 $content = $revision->getContent(); // sanity; get normalized version
1950
1951                                 if ( $content ) {
1952                                         $newsize = $content->getSize();
1953                                 }
1954
1955                                 // Update the page record with revision data
1956                                 $this->updateRevisionOn( $dbw, $revision, 0 );
1957
1958                                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1959
1960                                 // Update recentchanges
1961                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1962                                         // Mark as patrolled if the user can do so
1963                                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1964                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1965                                         // Add RC row to the DB
1966                                         $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1967                                                 '', $newsize, $revisionId, $patrolled );
1968
1969                                         // Log auto-patrolled edits
1970                                         if ( $patrolled ) {
1971                                                 PatrolLog::record( $rc, true, $user );
1972                                         }
1973                                 }
1974                                 $user->incEditCount();
1975
1976                         } catch ( Exception $e ) {
1977                                 $dbw->rollback( __METHOD__ );
1978                                 throw $e;
1979                         }
1980                         $dbw->commit( __METHOD__ );
1981
1982                         // Update links, etc.
1983                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1984
1985                         $hook_args = array( &$this, &$user, $content, $summary,
1986                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1987
1988                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1989                         Hooks::run( 'PageContentInsertComplete', $hook_args );
1990                 }
1991
1992                 // Do updates right now unless deferral was requested
1993                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1994                         DeferredUpdates::doUpdates();
1995                 }
1996
1997                 // Return the new revision (or null) to the caller
1998                 $status->value['revision'] = $revision;
1999
2000                 $hook_args = array( &$this, &$user, $content, $summary,
2001                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
2002
2003                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
2004                 Hooks::run( 'PageContentSaveComplete', $hook_args );
2005
2006                 // Promote user to any groups they meet the criteria for
2007                 $dbw->onTransactionIdle( function () use ( $user ) {
2008                         $user->addAutopromoteOnceGroups( 'onEdit' );
2009                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
2010                 } );
2011
2012                 return $status;
2013         }
2014
2015         /**
2016          * Get parser options suitable for rendering the primary article wikitext
2017          *
2018          * @see ContentHandler::makeParserOptions
2019          *
2020          * @param IContextSource|User|string $context One of the following:
2021          *        - IContextSource: Use the User and the Language of the provided
2022          *          context
2023          *        - User: Use the provided User object and $wgLang for the language,
2024          *          so use an IContextSource object if possible.
2025          *        - 'canonical': Canonical options (anonymous user with default
2026          *          preferences and content language).
2027          * @return ParserOptions
2028          */
2029         public function makeParserOptions( $context ) {
2030                 $options = $this->getContentHandler()->makeParserOptions( $context );
2031
2032                 if ( $this->getTitle()->isConversionTable() ) {
2033                         // @todo ConversionTable should become a separate content model, so
2034                         // we don't need special cases like this one.
2035                         $options->disableContentConversion();
2036                 }
2037
2038                 return $options;
2039         }
2040
2041         /**
2042          * Prepare text which is about to be saved.
2043          * Returns a stdClass with source, pst and output members
2044          *
2045          * @deprecated since 1.21: use prepareContentForEdit instead.
2046          * @return object
2047          */
2048         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2049                 ContentHandler::deprecated( __METHOD__, '1.21' );
2050                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2051                 return $this->prepareContentForEdit( $content, $revid, $user );
2052         }
2053
2054         /**
2055          * Prepare content which is about to be saved.
2056          * Returns a stdClass with source, pst and output members
2057          *
2058          * @param Content $content
2059          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2060          *        revision ID is also accepted, but this is deprecated.
2061          * @param User|null $user
2062          * @param string|null $serialFormat
2063          * @param bool $useCache Check shared prepared edit cache
2064          *
2065          * @return object
2066          *
2067          * @since 1.21
2068          */
2069         public function prepareContentForEdit(
2070                 Content $content, $revision = null, User $user = null, $serialFormat = null, $useCache = true
2071         ) {
2072                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2073
2074                 if ( is_object( $revision ) ) {
2075                         $revid = $revision->getId();
2076                 } else {
2077                         $revid = $revision;
2078                         // This code path is deprecated, and nothing is known to
2079                         // use it, so performance here shouldn't be a worry.
2080                         if ( $revid !== null ) {
2081                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2082                         } else {
2083                                 $revision = null;
2084                         }
2085                 }
2086
2087                 $user = is_null( $user ) ? $wgUser : $user;
2088                 //XXX: check $user->getId() here???
2089
2090                 // Use a sane default for $serialFormat, see bug 57026
2091                 if ( $serialFormat === null ) {
2092                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2093                 }
2094
2095                 if ( $this->mPreparedEdit
2096                         && $this->mPreparedEdit->newContent
2097                         && $this->mPreparedEdit->newContent->equals( $content )
2098                         && $this->mPreparedEdit->revid == $revid
2099                         && $this->mPreparedEdit->format == $serialFormat
2100                         // XXX: also check $user here?
2101                 ) {
2102                         // Already prepared
2103                         return $this->mPreparedEdit;
2104                 }
2105
2106                 // The edit may have already been prepared via api.php?action=stashedit
2107                 $cachedEdit = $useCache && $wgAjaxEditStash
2108                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2109                         : false;
2110
2111                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2112                 Hooks::run( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2113
2114                 $edit = (object)array();
2115                 if ( $cachedEdit ) {
2116                         $edit->timestamp = $cachedEdit->timestamp;
2117                 } else {
2118                         $edit->timestamp = wfTimestampNow();
2119                 }
2120                 // @note: $cachedEdit is not used if the rev ID was referenced in the text
2121                 $edit->revid = $revid;
2122
2123                 if ( $cachedEdit ) {
2124                         $edit->pstContent = $cachedEdit->pstContent;
2125                 } else {
2126                         $edit->pstContent = $content
2127                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2128                                 : null;
2129                 }
2130
2131                 $edit->format = $serialFormat;
2132                 $edit->popts = $this->makeParserOptions( 'canonical' );
2133                 if ( $cachedEdit ) {
2134                         $edit->output = $cachedEdit->output;
2135                 } else {
2136                         if ( $revision ) {
2137                                 // We get here if vary-revision is set. This means that this page references
2138                                 // itself (such as via self-transclusion). In this case, we need to make sure
2139                                 // that any such self-references refer to the newly-saved revision, and not
2140                                 // to the previous one, which could otherwise happen due to slave lag.
2141                                 $oldCallback = $edit->popts->setCurrentRevisionCallback(
2142                                         function ( $title, $parser = false ) use ( $revision, &$oldCallback ) {
2143                                                 if ( $title->equals( $revision->getTitle() ) ) {
2144                                                         return $revision;
2145                                                 } else {
2146                                                         return call_user_func(
2147                                                                 $oldCallback,
2148                                                                 $title,
2149                                                                 $parser
2150                                                         );
2151                                                 }
2152                                         }
2153                                 );
2154                         }
2155                         $edit->output = $edit->pstContent
2156                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2157                                 : null;
2158                 }
2159
2160                 $edit->newContent = $content;
2161                 $edit->oldContent = $this->getContent( Revision::RAW );
2162
2163                 // NOTE: B/C for hooks! don't use these fields!
2164                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2165                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2166                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2167
2168                 $this->mPreparedEdit = $edit;
2169                 return $edit;
2170         }
2171
2172         /**
2173          * Do standard deferred updates after page edit.
2174          * Update links tables, site stats, search index and message cache.
2175          * Purges pages that include this page if the text was changed here.
2176          * Every 100th edit, prune the recent changes table.
2177          *
2178          * @param Revision $revision
2179          * @param User $user User object that did the revision
2180          * @param array $options Array of options, following indexes are used:
2181          * - changed: boolean, whether the revision changed the content (default true)
2182          * - created: boolean, whether the revision created the page (default false)
2183          * - moved: boolean, whether the page was moved (default false)
2184          * - oldcountable: boolean, null, or string 'no-change' (default null):
2185          *   - boolean: whether the page was counted as an article before that
2186          *     revision, only used in changed is true and created is false
2187          *   - null: if created is false, don't update the article count; if created
2188          *     is true, do update the article count
2189          *   - 'no-change': don't update the article count, ever
2190          */
2191         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2192                 global $wgEnableParserCache;
2193
2194                 $options += array(
2195                         'changed' => true,
2196                         'created' => false,
2197                         'moved' => false,
2198                         'oldcountable' => null
2199                 );
2200                 $content = $revision->getContent();
2201
2202                 // Parse the text
2203                 // Be careful not to do pre-save transform twice: $text is usually
2204                 // already pre-save transformed once.
2205                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2206                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2207                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user );
2208                 } else {
2209                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2210                         $editInfo = $this->mPreparedEdit;
2211                 }
2212
2213                 // Save it to the parser cache
2214                 if ( $wgEnableParserCache ) {
2215                         $parserCache = ParserCache::singleton();
2216                         $parserCache->save(
2217                                 $editInfo->output, $this, $editInfo->popts, $editInfo->timestamp, $editInfo->revid
2218                         );
2219                 }
2220
2221                 // Update the links tables and other secondary data
2222                 if ( $content ) {
2223                         $recursive = $options['changed']; // bug 50785
2224                         $updates = $content->getSecondaryDataUpdates(
2225                                 $this->getTitle(), null, $recursive, $editInfo->output );
2226                         DataUpdate::runUpdates( $updates );
2227                 }
2228
2229                 Hooks::run( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2230
2231                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2232                         // Flush old entries from the `recentchanges` table
2233                         JobQueueGroup::singleton()->push( RecentChangesUpdateJob::newPurgeJob() );
2234                 }
2235
2236                 if ( !$this->exists() ) {
2237                         return;
2238                 }
2239
2240                 $id = $this->getId();
2241                 $title = $this->mTitle->getPrefixedDBkey();
2242                 $shortTitle = $this->mTitle->getDBkey();
2243
2244                 if ( $options['oldcountable'] === 'no-change' ||
2245                         ( !$options['changed'] && !$options['moved'] )
2246                 ) {
2247                         $good = 0;
2248                 } elseif ( $options['created'] ) {
2249                         $good = (int)$this->isCountable( $editInfo );
2250                 } elseif ( $options['oldcountable'] !== null ) {
2251                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2252                 } else {
2253                         $good = 0;
2254                 }
2255                 $edits = $options['changed'] ? 1 : 0;
2256                 $total = $options['created'] ? 1 : 0;
2257
2258                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2259                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2260
2261                 // If this is another user's talk page, update newtalk.
2262                 // Don't do this if $options['changed'] = false (null-edits) nor if
2263                 // it's a minor edit and the user doesn't want notifications for those.
2264                 if ( $options['changed']
2265                         && $this->mTitle->getNamespace() == NS_USER_TALK
2266                         && $shortTitle != $user->getTitleKey()
2267                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2268                 ) {
2269                         $recipient = User::newFromName( $shortTitle, false );
2270                         if ( !$recipient ) {
2271                                 wfDebug( __METHOD__ . ": invalid username\n" );
2272                         } else {
2273                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2274                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2275                                         if ( User::isIP( $shortTitle ) ) {
2276                                                 // An anonymous user
2277                                                 $recipient->setNewtalk( true, $revision );
2278                                         } elseif ( $recipient->isLoggedIn() ) {
2279                                                 $recipient->setNewtalk( true, $revision );
2280                                         } else {
2281                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2282                                         }
2283                                 }
2284                         }
2285                 }
2286
2287                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2288                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2289                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2290                         if ( $msgtext === false || $msgtext === null ) {
2291                                 $msgtext = '';
2292                         }
2293
2294                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2295                 }
2296
2297                 if ( $options['created'] ) {
2298                         self::onArticleCreate( $this->mTitle );
2299                 } elseif ( $options['changed'] ) { // bug 50785
2300                         self::onArticleEdit( $this->mTitle );
2301                 }
2302
2303         }
2304
2305         /**
2306          * Edit an article without doing all that other stuff
2307          * The article must already exist; link tables etc
2308          * are not updated, caches are not flushed.
2309          *
2310          * @param string $text Text submitted
2311          * @param User $user The relevant user
2312          * @param string $comment Comment submitted
2313          * @param bool $minor Whereas it's a minor modification
2314          *
2315          * @deprecated since 1.21, use doEditContent() instead.
2316          */
2317         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2318                 ContentHandler::deprecated( __METHOD__, "1.21" );
2319
2320                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2321                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2322         }
2323
2324         /**
2325          * Edit an article without doing all that other stuff
2326          * The article must already exist; link tables etc
2327          * are not updated, caches are not flushed.
2328          *
2329          * @param Content $content Content submitted
2330          * @param User $user The relevant user
2331          * @param string $comment Comment submitted
2332          * @param bool $minor Whereas it's a minor modification
2333          * @param string $serialFormat Format for storing the content in the database
2334          */
2335         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2336                 $serialFormat = null
2337         ) {
2338
2339                 $serialized = $content->serialize( $serialFormat );
2340
2341                 $dbw = wfGetDB( DB_MASTER );
2342                 $revision = new Revision( array(
2343                         'title'      => $this->getTitle(), // for determining the default content model
2344                         'page'       => $this->getId(),
2345                         'user_text'  => $user->getName(),
2346                         'user'       => $user->getId(),
2347                         'text'       => $serialized,
2348                         'length'     => $content->getSize(),
2349                         'comment'    => $comment,
2350                         'minor_edit' => $minor ? 1 : 0,
2351                 ) ); // XXX: set the content object?
2352                 $revision->insertOn( $dbw );
2353                 $this->updateRevisionOn( $dbw, $revision );
2354
2355                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2356
2357         }
2358
2359         /**
2360          * Update the article's restriction field, and leave a log entry.
2361          * This works for protection both existing and non-existing pages.
2362          *
2363          * @param array $limit Set of restriction keys
2364          * @param array $expiry Per restriction type expiration
2365          * @param int &$cascade Set to false if cascading protection isn't allowed.
2366          * @param string $reason
2367          * @param User $user The user updating the restrictions
2368          * @return Status
2369          */
2370         public function doUpdateRestrictions( array $limit, array $expiry,
2371                 &$cascade, $reason, User $user
2372         ) {
2373                 global $wgCascadingRestrictionLevels, $wgContLang;
2374
2375                 if ( wfReadOnly() ) {
2376                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2377                 }
2378
2379                 $this->loadPageData( 'fromdbmaster' );
2380                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2381                 $id = $this->getId();
2382
2383                 if ( !$cascade ) {
2384                         $cascade = false;
2385                 }
2386
2387                 // Take this opportunity to purge out expired restrictions
2388                 Title::purgeExpiredRestrictions();
2389
2390                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2391                 // we expect a single selection, but the schema allows otherwise.
2392                 $isProtected = false;
2393                 $protect = false;
2394                 $changed = false;
2395
2396                 $dbw = wfGetDB( DB_MASTER );
2397
2398                 foreach ( $restrictionTypes as $action ) {
2399                         if ( !isset( $expiry[$action] ) ) {
2400                                 $expiry[$action] = $dbw->getInfinity();
2401                         }
2402                         if ( !isset( $limit[$action] ) ) {
2403                                 $limit[$action] = '';
2404                         } elseif ( $limit[$action] != '' ) {
2405                                 $protect = true;
2406                         }
2407
2408                         // Get current restrictions on $action
2409                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2410                         if ( $current != '' ) {
2411                                 $isProtected = true;
2412                         }
2413
2414                         if ( $limit[$action] != $current ) {
2415                                 $changed = true;
2416                         } elseif ( $limit[$action] != '' ) {
2417                                 // Only check expiry change if the action is actually being
2418                                 // protected, since expiry does nothing on an not-protected
2419                                 // action.
2420                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2421                                         $changed = true;
2422                                 }
2423                         }
2424                 }
2425
2426                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2427                         $changed = true;
2428                 }
2429
2430                 // If nothing has changed, do nothing
2431                 if ( !$changed ) {
2432                         return Status::newGood();
2433                 }
2434
2435                 if ( !$protect ) { // No protection at all means unprotection
2436                         $revCommentMsg = 'unprotectedarticle';
2437                         $logAction = 'unprotect';
2438                 } elseif ( $isProtected ) {
2439                         $revCommentMsg = 'modifiedarticleprotection';
2440                         $logAction = 'modify';
2441                 } else {
2442                         $revCommentMsg = 'protectedarticle';
2443                         $logAction = 'protect';
2444                 }
2445
2446                 // Truncate for whole multibyte characters
2447                 $reason = $wgContLang->truncate( $reason, 255 );
2448
2449                 $logRelationsValues = array();
2450                 $logRelationsField = null;
2451
2452                 if ( $id ) { // Protection of existing page
2453                         if ( !Hooks::run( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2454                                 return Status::newGood();
2455                         }
2456
2457                         // Only certain restrictions can cascade...
2458                         $editrestriction = isset( $limit['edit'] )
2459                                 ? array( $limit['edit'] )
2460                                 : $this->mTitle->getRestrictions( 'edit' );
2461                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2462                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2463                         }
2464                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2465                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2466                         }
2467
2468                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2469                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2470                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2471                         }
2472                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2473                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2474                         }
2475
2476                         // The schema allows multiple restrictions
2477                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2478                                 $cascade = false;
2479                         }
2480
2481                         // insert null revision to identify the page protection change as edit summary
2482                         $latest = $this->getLatest();
2483                         $nullRevision = $this->insertProtectNullRevision(
2484                                 $revCommentMsg,
2485                                 $limit,
2486                                 $expiry,
2487                                 $cascade,
2488                                 $reason,
2489                                 $user
2490                         );
2491
2492                         if ( $nullRevision === null ) {
2493                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2494                         }
2495
2496                         $logRelationsField = 'pr_id';
2497
2498                         // Update restrictions table
2499                         foreach ( $limit as $action => $restrictions ) {
2500                                 $dbw->delete(
2501                                         'page_restrictions',
2502                                         array(
2503                                                 'pr_page' => $id,
2504                                                 'pr_type' => $action
2505                                         ),
2506                                         __METHOD__
2507                                 );
2508                                 if ( $restrictions != '' ) {
2509                                         $dbw->insert(
2510                                                 'page_restrictions',
2511                                                 array(
2512                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2513                                                         'pr_page' => $id,
2514                                                         'pr_type' => $action,
2515                                                         'pr_level' => $restrictions,
2516                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2517                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2518                                                 ),
2519                                                 __METHOD__
2520                                         );
2521                                         $logRelationsValues[] = $dbw->insertId();
2522                                 }
2523                         }
2524
2525                         // Clear out legacy restriction fields
2526                         $dbw->update(
2527                                 'page',
2528                                 array( 'page_restrictions' => '' ),
2529                                 array( 'page_id' => $id ),
2530                                 __METHOD__
2531                         );
2532
2533                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2534                         Hooks::run( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2535                 } else { // Protection of non-existing page (also known as "title protection")
2536                         // Cascade protection is meaningless in this case
2537                         $cascade = false;
2538
2539                         if ( $limit['create'] != '' ) {
2540                                 $dbw->replace( 'protected_titles',
2541                                         array( array( 'pt_namespace', 'pt_title' ) ),
2542                                         array(
2543                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2544                                                 'pt_title' => $this->mTitle->getDBkey(),
2545                                                 'pt_create_perm' => $limit['create'],
2546                                                 'pt_timestamp' => $dbw->timestamp(),
2547                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2548                                                 'pt_user' => $user->getId(),
2549                                                 'pt_reason' => $reason,
2550                                         ), __METHOD__
2551                                 );
2552                         } else {
2553                                 $dbw->delete( 'protected_titles',
2554                                         array(
2555                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2556                                                 'pt_title' => $this->mTitle->getDBkey()
2557                                         ), __METHOD__
2558                                 );
2559                         }
2560                 }
2561
2562                 $this->mTitle->flushRestrictions();
2563                 InfoAction::invalidateCache( $this->mTitle );
2564
2565                 if ( $logAction == 'unprotect' ) {
2566                         $params = array();
2567                 } else {
2568                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2569                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2570                 }
2571
2572                 // Update the protection log
2573                 $log = new LogPage( 'protect' );
2574                 $logId = $log->addEntry( $logAction, $this->mTitle, $reason, $params, $user );
2575                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2576                         $log->addRelations( $logRelationsField, $logRelationsValues, $logId );
2577                 }
2578
2579                 return Status::newGood();
2580         }
2581
2582         /**
2583          * Insert a new null revision for this page.
2584          *
2585          * @param string $revCommentMsg Comment message key for the revision
2586          * @param array $limit Set of restriction keys
2587          * @param array $expiry Per restriction type expiration
2588          * @param int $cascade Set to false if cascading protection isn't allowed.
2589          * @param string $reason
2590          * @param User|null $user
2591          * @return Revision|null Null on error
2592          */
2593         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2594                 array $expiry, $cascade, $reason, $user = null
2595         ) {
2596                 global $wgContLang;
2597                 $dbw = wfGetDB( DB_MASTER );
2598
2599                 // Prepare a null revision to be added to the history
2600                 $editComment = $wgContLang->ucfirst(
2601                         wfMessage(
2602                                 $revCommentMsg,
2603                                 $this->mTitle->getPrefixedText()
2604                         )->inContentLanguage()->text()
2605                 );
2606                 if ( $reason ) {
2607                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2608                 }
2609                 $protectDescription = $this->protectDescription( $limit, $expiry );
2610                 if ( $protectDescription ) {
2611                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2612                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2613                                 ->inContentLanguage()->text();
2614                 }
2615                 if ( $cascade ) {
2616                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2617                         $editComment .= wfMessage( 'brackets' )->params(
2618                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2619                         )->inContentLanguage()->text();
2620                 }
2621
2622                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2623                 if ( $nullRev ) {
2624                         $nullRev->insertOn( $dbw );
2625
2626                         // Update page record and touch page
2627                         $oldLatest = $nullRev->getParentId();
2628                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2629                 }
2630
2631                 return $nullRev;
2632         }
2633
2634         /**
2635          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2636          * @return string
2637          */
2638         protected function formatExpiry( $expiry ) {
2639                 global $wgContLang;
2640                 $dbr = wfGetDB( DB_SLAVE );
2641
2642                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2643                 if ( $encodedExpiry != 'infinity' ) {
2644                         return wfMessage(
2645                                 'protect-expiring',
2646                                 $wgContLang->timeanddate( $expiry, false, false ),
2647                                 $wgContLang->date( $expiry, false, false ),
2648                                 $wgContLang->time( $expiry, false, false )
2649                         )->inContentLanguage()->text();
2650                 } else {
2651                         return wfMessage( 'protect-expiry-indefinite' )
2652                                 ->inContentLanguage()->text();
2653                 }
2654         }
2655
2656         /**
2657          * Builds the description to serve as comment for the edit.
2658          *
2659          * @param array $limit Set of restriction keys
2660          * @param array $expiry Per restriction type expiration
2661          * @return string
2662          */
2663         public function protectDescription( array $limit, array $expiry ) {
2664                 $protectDescription = '';
2665
2666                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2667                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2668                         # All possible message keys are listed here for easier grepping:
2669                         # * restriction-create
2670                         # * restriction-edit
2671                         # * restriction-move
2672                         # * restriction-upload
2673                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2674                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2675                         # with '' filtered out. All possible message keys are listed below:
2676                         # * protect-level-autoconfirmed
2677                         # * protect-level-sysop
2678                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2679
2680                         $expiryText = $this->formatExpiry( $expiry[$action] );
2681
2682                         if ( $protectDescription !== '' ) {
2683                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2684                         }
2685                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2686                                 ->params( $actionText, $restrictionsText, $expiryText )
2687                                 ->inContentLanguage()->text();
2688                 }
2689
2690                 return $protectDescription;
2691         }
2692
2693         /**
2694          * Builds the description to serve as comment for the log entry.
2695          *
2696          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2697          * protect description text. Keep them in old format to avoid breaking compatibility.
2698          * TODO: Fix protection log to store structured description and format it on-the-fly.
2699          *
2700          * @param array $limit Set of restriction keys
2701          * @param array $expiry Per restriction type expiration
2702          * @return string
2703          */
2704         public function protectDescriptionLog( array $limit, array $expiry ) {
2705                 global $wgContLang;
2706
2707                 $protectDescriptionLog = '';
2708
2709                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2710                         $expiryText = $this->formatExpiry( $expiry[$action] );
2711                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2712                 }
2713
2714                 return trim( $protectDescriptionLog );
2715         }
2716
2717         /**
2718          * Take an array of page restrictions and flatten it to a string
2719          * suitable for insertion into the page_restrictions field.
2720          *
2721          * @param string[] $limit
2722          *
2723          * @throws MWException
2724          * @return string
2725          */
2726         protected static function flattenRestrictions( $limit ) {
2727                 if ( !is_array( $limit ) ) {
2728                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2729                 }
2730
2731                 $bits = array();
2732                 ksort( $limit );
2733
2734                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2735                         $bits[] = "$action=$restrictions";
2736                 }
2737
2738                 return implode( ':', $bits );
2739         }
2740
2741         /**
2742          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2743          * backwards compatibility, if you care about error reporting you should use
2744          * doDeleteArticleReal() instead.
2745          *
2746          * Deletes the article with database consistency, writes logs, purges caches
2747          *
2748          * @param string $reason Delete reason for deletion log
2749          * @param bool $suppress Suppress all revisions and log the deletion in
2750          *        the suppression log instead of the deletion log
2751          * @param int $id Article ID
2752          * @param bool $commit Defaults to true, triggers transaction end
2753          * @param array &$error Array of errors to append to
2754          * @param User $user The deleting user
2755          * @return bool True if successful
2756          */
2757         public function doDeleteArticle(
2758                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2759         ) {
2760                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2761                 return $status->isGood();
2762         }
2763
2764         /**
2765          * Back-end article deletion
2766          * Deletes the article with database consistency, writes logs, purges caches
2767          *
2768          * @since 1.19
2769          *
2770          * @param string $reason Delete reason for deletion log
2771          * @param bool $suppress Suppress all revisions and log the deletion in
2772          *   the suppression log instead of the deletion log
2773          * @param int $id Article ID
2774          * @param bool $commit Defaults to true, triggers transaction end
2775          * @param array &$error Array of errors to append to
2776          * @param User $user The deleting user
2777          * @return Status Status object; if successful, $status->value is the log_id of the
2778          *   deletion log entry. If the page couldn't be deleted because it wasn't
2779          *   found, $status is a non-fatal 'cannotdelete' error
2780          */
2781         public function doDeleteArticleReal(
2782                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2783         ) {
2784                 global $wgUser, $wgContentHandlerUseDB;
2785
2786                 wfDebug( __METHOD__ . "\n" );
2787
2788                 $status = Status::newGood();
2789
2790                 if ( $this->mTitle->getDBkey() === '' ) {
2791                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2792                         return $status;
2793                 }
2794
2795                 $user = is_null( $user ) ? $wgUser : $user;
2796                 if ( !Hooks::run( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2797                         if ( $status->isOK() ) {
2798                                 // Hook aborted but didn't set a fatal status
2799                                 $status->fatal( 'delete-hook-aborted' );
2800                         }
2801                         return $status;
2802                 }
2803
2804                 $dbw = wfGetDB( DB_MASTER );
2805                 $dbw->begin( __METHOD__ );
2806
2807                 if ( $id == 0 ) {
2808                         $this->loadPageData( 'forupdate' );
2809                         $id = $this->getID();
2810                         if ( $id == 0 ) {
2811                                 $dbw->rollback( __METHOD__ );
2812                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2813                                 return $status;
2814                         }
2815                 }
2816
2817                 // we need to remember the old content so we can use it to generate all deletion updates.
2818                 $content = $this->getContent( Revision::RAW );
2819
2820                 // Bitfields to further suppress the content
2821                 if ( $suppress ) {
2822                         $bitfield = 0;
2823                         // This should be 15...
2824                         $bitfield |= Revision::DELETED_TEXT;
2825                         $bitfield |= Revision::DELETED_COMMENT;
2826                         $bitfield |= Revision::DELETED_USER;
2827                         $bitfield |= Revision::DELETED_RESTRICTED;
2828                 } else {
2829                         $bitfield = 'rev_deleted';
2830                 }
2831
2832                 // For now, shunt the revision data into the archive table.
2833                 // Text is *not* removed from the text table; bulk storage
2834                 // is left intact to avoid breaking block-compression or
2835                 // immutable storage schemes.
2836                 //
2837                 // For backwards compatibility, note that some older archive
2838                 // table entries will have ar_text and ar_flags fields still.
2839                 //
2840                 // In the future, we may keep revisions and mark them with
2841                 // the rev_deleted field, which is reserved for this purpose.
2842
2843                 $row = array(
2844                         'ar_namespace'  => 'page_namespace',
2845                         'ar_title'      => 'page_title',
2846                         'ar_comment'    => 'rev_comment',
2847                         'ar_user'       => 'rev_user',
2848                         'ar_user_text'  => 'rev_user_text',
2849                         'ar_timestamp'  => 'rev_timestamp',
2850                         'ar_minor_edit' => 'rev_minor_edit',
2851                         'ar_rev_id'     => 'rev_id',
2852                         'ar_parent_id'  => 'rev_parent_id',
2853                         'ar_text_id'    => 'rev_text_id',
2854                         'ar_text'       => '\'\'', // Be explicit to appease
2855                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2856                         'ar_len'        => 'rev_len',
2857                         'ar_page_id'    => 'page_id',
2858                         'ar_deleted'    => $bitfield,
2859                         'ar_sha1'       => 'rev_sha1',
2860                 );
2861
2862                 if ( $wgContentHandlerUseDB ) {
2863                         $row['ar_content_model'] = 'rev_content_model';
2864                         $row['ar_content_format'] = 'rev_content_format';
2865                 }
2866
2867                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2868                         $row,
2869                         array(
2870                                 'page_id' => $id,
2871                                 'page_id = rev_page'
2872                         ), __METHOD__
2873                 );
2874
2875                 // Now that it's safely backed up, delete it
2876                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2877                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2878
2879                 if ( !$ok ) {
2880                         $dbw->rollback( __METHOD__ );
2881                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2882                         return $status;
2883                 }
2884
2885                 if ( !$dbw->cascadingDeletes() ) {
2886                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2887                 }
2888
2889                 // Clone the title, so we have the information we need when we log
2890                 $logTitle = clone $this->mTitle;
2891
2892                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2893                 $logtype = $suppress ? 'suppress' : 'delete';
2894
2895                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2896                 $logEntry->setPerformer( $user );
2897                 $logEntry->setTarget( $logTitle );
2898                 $logEntry->setComment( $reason );
2899                 $logid = $logEntry->insert();
2900
2901                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
2902                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2903                         $logEntry->publish( $logid );
2904                 } );
2905
2906                 if ( $commit ) {
2907                         $dbw->commit( __METHOD__ );
2908                 }
2909
2910                 $this->doDeleteUpdates( $id, $content );
2911
2912                 Hooks::run( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2913                 $status->value = $logid;
2914                 return $status;
2915         }
2916
2917         /**
2918          * Do some database updates after deletion
2919          *
2920          * @param int $id The page_id value of the page being deleted
2921          * @param Content $content Optional page content to be used when determining
2922          *   the required updates. This may be needed because $this->getContent()
2923          *   may already return null when the page proper was deleted.
2924          */
2925         public function doDeleteUpdates( $id, Content $content = null ) {
2926                 // update site status
2927                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2928
2929                 // remove secondary indexes, etc
2930                 $updates = $this->getDeletionUpdates( $content );
2931                 DataUpdate::runUpdates( $updates );
2932
2933                 // Reparse any pages transcluding this page
2934                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2935
2936                 // Reparse any pages including this image
2937                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2938                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2939                 }
2940
2941                 // Clear caches
2942                 WikiPage::onArticleDelete( $this->mTitle );
2943
2944                 // Reset this object and the Title object
2945                 $this->loadFromRow( false, self::READ_LATEST );
2946
2947                 // Search engine
2948                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2949         }
2950
2951         /**
2952          * Roll back the most recent consecutive set of edits to a page
2953          * from the same user; fails if there are no eligible edits to
2954          * roll back to, e.g. user is the sole contributor. This function
2955          * performs permissions checks on $user, then calls commitRollback()
2956          * to do the dirty work
2957          *
2958          * @todo Separate the business/permission stuff out from backend code
2959          *
2960          * @param string $fromP Name of the user whose edits to rollback.
2961          * @param string $summary Custom summary. Set to default summary if empty.
2962          * @param string $token Rollback token.
2963          * @param bool $bot If true, mark all reverted edits as bot.
2964          *
2965          * @param array $resultDetails Array contains result-specific array of additional values
2966          *    'alreadyrolled' : 'current' (rev)
2967          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2968          *
2969          * @param User $user The user performing the rollback
2970          * @return array Array of errors, each error formatted as
2971          *   array(messagekey, param1, param2, ...).
2972          * On success, the array is empty.  This array can also be passed to
2973          * OutputPage::showPermissionsErrorPage().
2974          */
2975         public function doRollback(
2976                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2977         ) {
2978                 $resultDetails = null;
2979
2980                 // Check permissions
2981                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2982                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2983                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2984
2985                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2986                         $errors[] = array( 'sessionfailure' );
2987                 }
2988
2989                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2990                         $errors[] = array( 'actionthrottledtext' );
2991                 }
2992
2993                 // If there were errors, bail out now
2994                 if ( !empty( $errors ) ) {
2995                         return $errors;
2996                 }
2997
2998                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2999         }
3000
3001         /**
3002          * Backend implementation of doRollback(), please refer there for parameter
3003          * and return value documentation
3004          *
3005          * NOTE: This function does NOT check ANY permissions, it just commits the
3006          * rollback to the DB. Therefore, you should only call this function direct-
3007          * ly if you want to use custom permissions checks. If you don't, use
3008          * doRollback() instead.
3009          * @param string $fromP Name of the user whose edits to rollback.
3010          * @param string $summary Custom summary. Set to default summary if empty.
3011          * @param bool $bot If true, mark all reverted edits as bot.
3012          *
3013          * @param array $resultDetails Contains result-specific array of additional values
3014          * @param User $guser The user performing the rollback
3015          * @return array
3016          */
3017         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
3018                 global $wgUseRCPatrol, $wgContLang;
3019
3020                 $dbw = wfGetDB( DB_MASTER );
3021
3022                 if ( wfReadOnly() ) {
3023                         return array( array( 'readonlytext' ) );
3024                 }
3025
3026                 // Get the last editor
3027                 $current = $this->getRevision();
3028                 if ( is_null( $current ) ) {
3029                         // Something wrong... no page?
3030                         return array( array( 'notanarticle' ) );
3031                 }
3032
3033                 $from = str_replace( '_', ' ', $fromP );
3034                 // User name given should match up with the top revision.
3035                 // If the user was deleted then $from should be empty.
3036                 if ( $from != $current->getUserText() ) {
3037                         $resultDetails = array( 'current' => $current );
3038                         return array( array( 'alreadyrolled',
3039                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3040                                 htmlspecialchars( $fromP ),
3041                                 htmlspecialchars( $current->getUserText() )
3042                         ) );
3043                 }
3044
3045                 // Get the last edit not by this guy...
3046                 // Note: these may not be public values
3047                 $user = intval( $current->getUser( Revision::RAW ) );
3048                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3049                 $s = $dbw->selectRow( 'revision',
3050                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3051                         array( 'rev_page' => $current->getPage(),
3052                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3053                         ), __METHOD__,
3054                         array( 'USE INDEX' => 'page_timestamp',
3055                                 'ORDER BY' => 'rev_timestamp DESC' )
3056                         );
3057                 if ( $s === false ) {
3058                         // No one else ever edited this page
3059                         return array( array( 'cantrollback' ) );
3060                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3061                         || $s->rev_deleted & Revision::DELETED_USER
3062                 ) {
3063                         // Only admins can see this text
3064                         return array( array( 'notvisiblerev' ) );
3065                 }
3066
3067                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3068                 // This is done before the rollback edit to have patrolling also on failure (bug 62157).
3069                 $set = array();
3070                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3071                         // Mark all reverted edits as bot
3072                         $set['rc_bot'] = 1;
3073                 }
3074
3075                 if ( $wgUseRCPatrol ) {
3076                         // Mark all reverted edits as patrolled
3077                         $set['rc_patrolled'] = 1;
3078                 }
3079
3080                 if ( count( $set ) ) {
3081                         $dbw->update( 'recentchanges', $set,
3082                                 array( /* WHERE */
3083                                         'rc_cur_id' => $current->getPage(),
3084                                         'rc_user_text' => $current->getUserText(),
3085                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3086                                 ), __METHOD__
3087                         );
3088                 }
3089
3090                 // Generate the edit summary if necessary
3091                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3092                 if ( empty( $summary ) ) {
3093                         if ( $from == '' ) { // no public user name
3094                                 $summary = wfMessage( 'revertpage-nouser' );
3095                         } else {
3096                                 $summary = wfMessage( 'revertpage' );
3097                         }
3098                 }
3099
3100                 // Allow the custom summary to use the same args as the default message
3101                 $args = array(
3102                         $target->getUserText(), $from, $s->rev_id,
3103                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3104                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3105                 );
3106                 if ( $summary instanceof Message ) {
3107                         $summary = $summary->params( $args )->inContentLanguage()->text();
3108                 } else {
3109                         $summary = wfMsgReplaceArgs( $summary, $args );
3110                 }
3111
3112                 // Trim spaces on user supplied text
3113                 $summary = trim( $summary );
3114
3115                 // Truncate for whole multibyte characters.
3116                 $summary = $wgContLang->truncate( $summary, 255 );
3117
3118                 // Save
3119                 $flags = EDIT_UPDATE;
3120
3121                 if ( $guser->isAllowed( 'minoredit' ) ) {
3122                         $flags |= EDIT_MINOR;
3123                 }
3124
3125                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3126                         $flags |= EDIT_FORCE_BOT;
3127                 }
3128
3129                 // Actually store the edit
3130                 $status = $this->doEditContent(
3131                         $target->getContent(),
3132                         $summary,
3133                         $flags,
3134                         $target->getId(),
3135                         $guser
3136                 );
3137
3138                 if ( !$status->isOK() ) {
3139                         return $status->getErrorsArray();
3140                 }
3141
3142                 // raise error, when the edit is an edit without a new version
3143                 if ( empty( $status->value['revision'] ) ) {
3144                         $resultDetails = array( 'current' => $current );
3145                         return array( array( 'alreadyrolled',
3146                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3147                                         htmlspecialchars( $fromP ),
3148                                         htmlspecialchars( $current->getUserText() )
3149                         ) );
3150                 }
3151
3152                 $revId = $status->value['revision']->getId();
3153
3154                 Hooks::run( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
3155
3156                 $resultDetails = array(
3157                         'summary' => $summary,
3158                         'current' => $current,
3159                         'target' => $target,
3160                         'newid' => $revId
3161                 );
3162
3163                 return array();
3164         }
3165
3166         /**
3167          * The onArticle*() functions are supposed to be a kind of hooks
3168          * which should be called whenever any of the specified actions
3169          * are done.
3170          *
3171          * This is a good place to put code to clear caches, for instance.
3172          *
3173          * This is called on page move and undelete, as well as edit
3174          *
3175          * @param Title $title
3176          */
3177         public static function onArticleCreate( Title $title ) {
3178                 // Update existence markers on article/talk tabs...
3179                 $other = $title->getOtherPage();
3180
3181                 $other->invalidateCache();
3182                 $other->purgeSquid();
3183
3184                 $title->touchLinks();
3185                 $title->purgeSquid();
3186                 $title->deleteTitleProtection();
3187         }
3188
3189         /**
3190          * Clears caches when article is deleted
3191          *
3192          * @param Title $title
3193          */
3194         public static function onArticleDelete( Title $title ) {
3195                 // Update existence markers on article/talk tabs...
3196                 $other = $title->getOtherPage();
3197
3198                 $other->invalidateCache();
3199                 $other->purgeSquid();
3200
3201                 $title->touchLinks();
3202                 $title->purgeSquid();
3203
3204                 // File cache
3205                 HTMLFileCache::clearFileCache( $title );
3206                 InfoAction::invalidateCache( $title );
3207
3208                 // Messages
3209                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3210                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3211                 }
3212
3213                 // Images
3214                 if ( $title->getNamespace() == NS_FILE ) {
3215                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3216                         $update->doUpdate();
3217                 }
3218
3219                 // User talk pages
3220                 if ( $title->getNamespace() == NS_USER_TALK ) {
3221                         $user = User::newFromName( $title->getText(), false );
3222                         if ( $user ) {
3223                                 $user->setNewtalk( false );
3224                         }
3225                 }
3226
3227                 // Image redirects
3228                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3229         }
3230
3231         /**
3232          * Purge caches on page update etc
3233          *
3234          * @param Title $title
3235          */
3236         public static function onArticleEdit( Title $title ) {
3237                 // Invalidate caches of articles which include this page
3238                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3239
3240                 // Invalidate the caches of all pages which redirect here
3241                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3242
3243                 // Purge squid for this page only
3244                 $title->purgeSquid();
3245
3246                 // Clear file cache for this page only
3247                 HTMLFileCache::clearFileCache( $title );
3248                 InfoAction::invalidateCache( $title );
3249         }
3250
3251         /**#@-*/
3252
3253         /**
3254          * Returns a list of categories this page is a member of.
3255          * Results will include hidden categories
3256          *
3257          * @return TitleArray
3258          */
3259         public function getCategories() {
3260                 $id = $this->getId();
3261                 if ( $id == 0 ) {
3262                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3263                 }
3264
3265                 $dbr = wfGetDB( DB_SLAVE );
3266                 $res = $dbr->select( 'categorylinks',
3267                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3268                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3269                         // as not being aliases, and NS_CATEGORY is numeric
3270                         array( 'cl_from' => $id ),
3271                         __METHOD__ );
3272
3273                 return TitleArray::newFromResult( $res );
3274         }
3275
3276         /**
3277          * Returns a list of hidden categories this page is a member of.
3278          * Uses the page_props and categorylinks tables.
3279          *
3280          * @return array Array of Title objects
3281          */
3282         public function getHiddenCategories() {
3283                 $result = array();
3284                 $id = $this->getId();
3285
3286                 if ( $id == 0 ) {
3287                         return array();
3288                 }
3289
3290                 $dbr = wfGetDB( DB_SLAVE );
3291                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3292                         array( 'cl_to' ),
3293                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3294                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3295                         __METHOD__ );
3296
3297                 if ( $res !== false ) {
3298                         foreach ( $res as $row ) {
3299                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3300                         }
3301                 }
3302
3303                 return $result;
3304         }
3305
3306         /**
3307          * Return an applicable autosummary if one exists for the given edit.
3308          * @param string|null $oldtext The previous text of the page.
3309          * @param string|null $newtext The submitted text of the page.
3310          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3311          * @return string An appropriate autosummary, or an empty string.
3312          *
3313          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3314          */
3315         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3316                 // NOTE: stub for backwards-compatibility. assumes the given text is
3317                 // wikitext. will break horribly if it isn't.
3318
3319                 ContentHandler::deprecated( __METHOD__, '1.21' );
3320
3321                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3322                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3323                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3324
3325                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3326         }
3327
3328         /**
3329          * Auto-generates a deletion reason
3330          *
3331          * @param bool &$hasHistory Whether the page has a history
3332          * @return string|bool String containing deletion reason or empty string, or boolean false
3333          *    if no revision occurred
3334          */
3335         public function getAutoDeleteReason( &$hasHistory ) {
3336                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3337         }
3338
3339         /**
3340          * Update all the appropriate counts in the category table, given that
3341          * we've added the categories $added and deleted the categories $deleted.
3342          *
3343          * @param array $added The names of categories that were added
3344          * @param array $deleted The names of categories that were deleted
3345          */
3346         public function updateCategoryCounts( array $added, array $deleted ) {
3347                 $that = $this;
3348                 $method = __METHOD__;
3349                 $dbw = wfGetDB( DB_MASTER );
3350
3351                 // Do this at the end of the commit to reduce lock wait timeouts
3352                 $dbw->onTransactionPreCommitOrIdle(
3353                         function () use ( $dbw, $that, $method, $added, $deleted ) {
3354                                 $ns = $that->getTitle()->getNamespace();
3355
3356                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3357                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3358                                 if ( $ns == NS_CATEGORY ) {
3359                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3360                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3361                                 } elseif ( $ns == NS_FILE ) {
3362                                         $addFields[] = 'cat_files = cat_files + 1';
3363                                         $removeFields[] = 'cat_files = cat_files - 1';
3364                                 }
3365
3366                                 if ( count( $added ) ) {
3367                                         $insertRows = array();
3368                                         foreach ( $added as $cat ) {
3369                                                 $insertRows[] = array(
3370                                                         'cat_title'   => $cat,
3371                                                         'cat_pages'   => 1,
3372                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3373                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3374                                                 );
3375                                         }
3376                                         $dbw->upsert(
3377                                                 'category',
3378                                                 $insertRows,
3379                                                 array( 'cat_title' ),
3380                                                 $addFields,
3381                                                 $method
3382                                         );
3383                                 }
3384
3385                                 if ( count( $deleted ) ) {
3386                                         $dbw->update(
3387                                                 'category',
3388                                                 $removeFields,
3389                                                 array( 'cat_title' => $deleted ),
3390                                                 $method
3391                                         );
3392                                 }
3393
3394                                 foreach ( $added as $catName ) {
3395                                         $cat = Category::newFromName( $catName );
3396                                         Hooks::run( 'CategoryAfterPageAdded', array( $cat, $that ) );
3397                                 }
3398
3399                                 foreach ( $deleted as $catName ) {
3400                                         $cat = Category::newFromName( $catName );
3401                                         Hooks::run( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3402                                 }
3403                         }
3404                 );
3405         }
3406
3407         /**
3408          * Opportunistically enqueue link update jobs given fresh parser output if useful
3409          *
3410          * @param ParserOutput $parserOutput Current version page output
3411          * @since 1.25
3412          */
3413         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3414                 if ( wfReadOnly() ) {
3415                         return;
3416                 }
3417
3418                 if ( !Hooks::run( 'OpportunisticLinksUpdate', array( $this, $this->mTitle, $parserOutput ) ) ) {
3419                         return;
3420                 }
3421
3422                 if ( $this->mTitle->areRestrictionsCascading() ) {
3423                         // If the page is cascade protecting, the links should really be up-to-date
3424                         $params = array( 'prioritize' => true );
3425                 } elseif ( $parserOutput->hasDynamicContent() ) {
3426                         // Assume the output contains time/random based magic words
3427                         $params = array();
3428                 } else {
3429                         // If the inclusions are deterministic, the edit-triggered link jobs are enough
3430                         return;
3431                 }
3432
3433                 // Check if the last link refresh was before page_touched
3434                 if ( $this->getLinksTimestamp() < $this->getTouched() ) {
3435                         JobQueueGroup::singleton()->push( EnqueueJob::newFromLocalJobs(
3436                                 new JobSpecification( 'refreshLinks', $params, array(), $this->mTitle )
3437                         ) );
3438                         return;
3439                 }
3440
3441                 return;
3442         }
3443
3444         /**
3445          * Return a list of templates used by this article.
3446          * Uses the templatelinks table
3447          *
3448          * @deprecated since 1.19; use Title::getTemplateLinksFrom()
3449          * @return array Array of Title objects
3450          */
3451         public function getUsedTemplates() {
3452                 return $this->mTitle->getTemplateLinksFrom();
3453         }
3454
3455         /**
3456          * This function is called right before saving the wikitext,
3457          * so we can do things like signatures and links-in-context.
3458          *
3459          * @deprecated since 1.19; use Parser::preSaveTransform() instead
3460          * @param string $text Article contents
3461          * @param User $user User doing the edit
3462          * @param ParserOptions $popts Parser options, default options for
3463          *   the user loaded if null given
3464          * @return string Article contents with altered wikitext markup (signatures
3465          *      converted, {{subst:}}, templates, etc.)
3466          */
3467         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3468                 global $wgParser, $wgUser;
3469
3470                 wfDeprecated( __METHOD__, '1.19' );
3471
3472                 $user = is_null( $user ) ? $wgUser : $user;
3473
3474                 if ( $popts === null ) {
3475                         $popts = ParserOptions::newFromUser( $user );
3476                 }
3477
3478                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3479         }
3480
3481         /**
3482          * Update the article's restriction field, and leave a log entry.
3483          *
3484          * @deprecated since 1.19
3485          * @param array $limit Set of restriction keys
3486          * @param string $reason
3487          * @param int &$cascade Set to false if cascading protection isn't allowed.
3488          * @param array $expiry Per restriction type expiration
3489          * @param User $user The user updating the restrictions
3490          * @return bool True on success
3491          */
3492         public function updateRestrictions(
3493                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3494         ) {
3495                 global $wgUser;
3496
3497                 $user = is_null( $user ) ? $wgUser : $user;
3498
3499                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3500         }
3501
3502         /**
3503          * Returns a list of updates to be performed when this page is deleted. The
3504          * updates should remove any information about this page from secondary data
3505          * stores such as links tables.
3506          *
3507          * @param Content|null $content Optional Content object for determining the
3508          *   necessary updates.
3509          * @return array An array of DataUpdates objects
3510          */
3511         public function getDeletionUpdates( Content $content = null ) {
3512                 if ( !$content ) {
3513                         // load content object, which may be used to determine the necessary updates
3514                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3515                         $content = $this->getContent( Revision::RAW );
3516                 }
3517
3518                 if ( !$content ) {
3519                         $updates = array();
3520                 } else {
3521                         $updates = $content->getDeletionUpdates( $this );
3522                 }
3523
3524                 Hooks::run( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3525                 return $updates;
3526         }
3527 }