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 ( is_int( $from ) ) {
 365                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 366                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 367
 368                         if ( !$data
 369                                 && $index == DB_SLAVE
 370                                 && wfGetLB()->getServerCount() > 1
 371                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 372                         ) {
 373                                 $from = self::READ_LATEST;
 374                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 375                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 376                         }
 377                 } else {
 378                         // No idea from where the caller got this data, assume slave database.
 379                         $data = $from;
 380                         $from = self::READ_NORMAL;
 381                 }
 382
 383                 $this->loadFromRow( $data, $from );
 384         }
 385
 386         /**
 387          * Load the object from a database row
 388          *
 389          * @since 1.20
 390          * @param object $data Database row containing at least fields returned by selectFields()
 391          * @param string|int $from One of the following:
 392          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 393          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 394          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 395          *          the master DB using SELECT FOR UPDATE
 396          */
 397         public function loadFromRow( $data, $from ) {
 398                 $lc = LinkCache::singleton();
 399                 $lc->clearLink( $this->mTitle );
 400
 401                 if ( $data ) {
 402                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 403
 404                         $this->mTitle->loadFromRow( $data );
 405
 406                         // Old-fashioned restrictions
 407                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 408
 409                         $this->mId = intval( $data->page_id );
 410                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 411                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 412                         $this->mIsRedirect = intval( $data->page_is_redirect );
 413                         $this->mLatest = intval( $data->page_latest );
 414                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 415                         // Double-check the ID of any cached latest Revision object for consistency.
 416                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 417                                 $this->mLastRevision = null;
 418                                 $this->mTimestamp = '';
 419                         }
 420                 } else {
 421                         $lc->addBadLinkObj( $this->mTitle );
 422
 423                         $this->mTitle->loadFromRow( false );
 424
 425                         $this->clearCacheFields();
 426
 427                         $this->mId = 0;
 428                 }
 429
 430                 $this->mDataLoaded = true;
 431                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 432         }
 433
 434         /**
 435          * @return int Page ID
 436          */
 437         public function getId() {
 438                 if ( !$this->mDataLoaded ) {
 439                         $this->loadPageData();
 440                 }
 441                 return $this->mId;
 442         }
 443
 444         /**
 445          * @return bool Whether or not the page exists in the database
 446          */
 447         public function exists() {
 448                 if ( !$this->mDataLoaded ) {
 449                         $this->loadPageData();
 450                 }
 451                 return $this->mId > 0;
 452         }
 453
 454         /**
 455          * Check if this page is something we're going to be showing
 456          * some sort of sensible content for. If we return false, page
 457          * views (plain action=view) will return an HTTP 404 response,
 458          * so spiders and robots can know they're following a bad link.
 459          *
 460          * @return bool
 461          */
 462         public function hasViewableContent() {
 463                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 464         }
 465
 466         /**
 467          * Tests if the article content represents a redirect
 468          *
 469          * @return bool
 470          */
 471         public function isRedirect() {
 472                 $content = $this->getContent();
 473                 if ( !$content ) {
 474                         return false;
 475                 }
 476
 477                 return $content->isRedirect();
 478         }
 479
 480         /**
 481          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 482          *
 483          * Will use the revisions actual content model if the page exists,
 484          * and the page's default if the page doesn't exist yet.
 485          *
 486          * @return string
 487          *
 488          * @since 1.21
 489          */
 490         public function getContentModel() {
 491                 if ( $this->exists() ) {
 492                         // look at the revision's actual content model
 493                         $rev = $this->getRevision();
 494
 495                         if ( $rev !== null ) {
 496                                 return $rev->getContentModel();
 497                         } else {
 498                                 $title = $this->mTitle->getPrefixedDBkey();
 499                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 500                         }
 501                 }
 502
 503                 // use the default model for this page
 504                 return $this->mTitle->getContentModel();
 505         }
 506
 507         /**
 508          * Loads page_touched and returns a value indicating if it should be used
 509          * @return bool True if not a redirect
 510          */
 511         public function checkTouched() {
 512                 if ( !$this->mDataLoaded ) {
 513                         $this->loadPageData();
 514                 }
 515                 return !$this->mIsRedirect;
 516         }
 517
 518         /**
 519          * Get the page_touched field
 520          * @return string Containing GMT timestamp
 521          */
 522         public function getTouched() {
 523                 if ( !$this->mDataLoaded ) {
 524                         $this->loadPageData();
 525                 }
 526                 return $this->mTouched;
 527         }
 528
 529         /**
 530          * Get the page_links_updated field
 531          * @return string|null Containing GMT timestamp
 532          */
 533         public function getLinksTimestamp() {
 534                 if ( !$this->mDataLoaded ) {
 535                         $this->loadPageData();
 536                 }
 537                 return $this->mLinksUpdated;
 538         }
 539
 540         /**
 541          * Get the page_latest field
 542          * @return int The rev_id of current revision
 543          */
 544         public function getLatest() {
 545                 if ( !$this->mDataLoaded ) {
 546                         $this->loadPageData();
 547                 }
 548                 return (int)$this->mLatest;
 549         }
 550
 551         /**
 552          * Get the Revision object of the oldest revision
 553          * @return Revision|null
 554          */
 555         public function getOldestRevision() {
 556
 557                 // Try using the slave database first, then try the master
 558                 $continue = 2;
 559                 $db = wfGetDB( DB_SLAVE );
 560                 $revSelectFields = Revision::selectFields();
 561
 562                 $row = null;
 563                 while ( $continue ) {
 564                         $row = $db->selectRow(
 565                                 array( 'page', 'revision' ),
 566                                 $revSelectFields,
 567                                 array(
 568                                         'page_namespace' => $this->mTitle->getNamespace(),
 569                                         'page_title' => $this->mTitle->getDBkey(),
 570                                         'rev_page = page_id'
 571                                 ),
 572                                 __METHOD__,
 573                                 array(
 574                                         'ORDER BY' => 'rev_timestamp ASC'
 575                                 )
 576                         );
 577
 578                         if ( $row ) {
 579                                 $continue = 0;
 580                         } else {
 581                                 $db = wfGetDB( DB_MASTER );
 582                                 $continue--;
 583                         }
 584                 }
 585
 586                 return $row ? Revision::newFromRow( $row ) : null;
 587         }
 588
 589         /**
 590          * Loads everything except the text
 591          * This isn't necessary for all uses, so it's only done if needed.
 592          */
 593         protected function loadLastEdit() {
 594                 if ( $this->mLastRevision !== null ) {
 595                         return; // already loaded
 596                 }
 597
 598                 $latest = $this->getLatest();
 599                 if ( !$latest ) {
 600                         return; // page doesn't exist or is missing page_latest info
 601                 }
 602
 603                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 604                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 605                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 606                         // transactions, where S1 normally only sees changes committed before the first S1
 607                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 608                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 609                         // happened after the first S1 SELECT.
 610                         // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 611                         $flags = Revision::READ_LOCKING;
 612                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 613                         // Bug T93976: if page_latest was loaded from the master, fetch the
 614                         // revision from there as well, as it may not exist yet on a slave DB.
 615                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 616                         $flags = Revision::READ_LATEST;
 617                 } else {
 618                         $flags = 0;
 619                 }
 620                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 621                 if ( $revision ) { // sanity
 622                         $this->setLastEdit( $revision );
 623                 }
 624         }
 625
 626         /**
 627          * Set the latest revision
 628          * @param Revision $revision
 629          */
 630         protected function setLastEdit( Revision $revision ) {
 631                 $this->mLastRevision = $revision;
 632                 $this->mTimestamp = $revision->getTimestamp();
 633         }
 634
 635         /**
 636          * Get the latest revision
 637          * @return Revision|null
 638          */
 639         public function getRevision() {
 640                 $this->loadLastEdit();
 641                 if ( $this->mLastRevision ) {
 642                         return $this->mLastRevision;
 643                 }
 644                 return null;
 645         }
 646
 647         /**
 648          * Get the content of the current revision. No side-effects...
 649          *
 650          * @param int $audience One of:
 651          *   Revision::FOR_PUBLIC       to be displayed to all users
 652          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 653          *   Revision::RAW              get the text regardless of permissions
 654          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 655          *   to the $audience parameter
 656          * @return Content|null The content of the current revision
 657          *
 658          * @since 1.21
 659          */
 660         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 661                 $this->loadLastEdit();
 662                 if ( $this->mLastRevision ) {
 663                         return $this->mLastRevision->getContent( $audience, $user );
 664                 }
 665                 return null;
 666         }
 667
 668         /**
 669          * Get the text of the current revision. No side-effects...
 670          *
 671          * @param int $audience One of:
 672          *   Revision::FOR_PUBLIC       to be displayed to all users
 673          *   Revision::FOR_THIS_USER    to be displayed to the given user
 674          *   Revision::RAW              get the text regardless of permissions
 675          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 676          *   to the $audience parameter
 677          * @return string|bool The text of the current revision
 678          * @deprecated since 1.21, getContent() should be used instead.
 679          */
 680         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 681                 ContentHandler::deprecated( __METHOD__, '1.21' );
 682
 683                 $this->loadLastEdit();
 684                 if ( $this->mLastRevision ) {
 685                         return $this->mLastRevision->getText( $audience, $user );
 686                 }
 687                 return false;
 688         }
 689
 690         /**
 691          * Get the text of the current revision. No side-effects...
 692          *
 693          * @return string|bool The text of the current revision. False on failure
 694          * @deprecated since 1.21, getContent() should be used instead.
 695          */
 696         public function getRawText() {
 697                 ContentHandler::deprecated( __METHOD__, '1.21' );
 698
 699                 return $this->getText( Revision::RAW );
 700         }
 701
 702         /**
 703          * @return string MW timestamp of last article revision
 704          */
 705         public function getTimestamp() {
 706                 // Check if the field has been filled by WikiPage::setTimestamp()
 707                 if ( !$this->mTimestamp ) {
 708                         $this->loadLastEdit();
 709                 }
 710
 711                 return wfTimestamp( TS_MW, $this->mTimestamp );
 712         }
 713
 714         /**
 715          * Set the page timestamp (use only to avoid DB queries)
 716          * @param string $ts MW timestamp of last article revision
 717          * @return void
 718          */
 719         public function setTimestamp( $ts ) {
 720                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 721         }
 722
 723         /**
 724          * @param int $audience One of:
 725          *   Revision::FOR_PUBLIC       to be displayed to all users
 726          *   Revision::FOR_THIS_USER    to be displayed to the given user
 727          *   Revision::RAW              get the text regardless of permissions
 728          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 729          *   to the $audience parameter
 730          * @return int User ID for the user that made the last article revision
 731          */
 732         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 733                 $this->loadLastEdit();
 734                 if ( $this->mLastRevision ) {
 735                         return $this->mLastRevision->getUser( $audience, $user );
 736                 } else {
 737                         return -1;
 738                 }
 739         }
 740
 741         /**
 742          * Get the User object of the user who created the page
 743          * @param int $audience One of:
 744          *   Revision::FOR_PUBLIC       to be displayed to all users
 745          *   Revision::FOR_THIS_USER    to be displayed to the given user
 746          *   Revision::RAW              get the text regardless of permissions
 747          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 748          *   to the $audience parameter
 749          * @return User|null
 750          */
 751         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 752                 $revision = $this->getOldestRevision();
 753                 if ( $revision ) {
 754                         $userName = $revision->getUserText( $audience, $user );
 755                         return User::newFromName( $userName, false );
 756                 } else {
 757                         return null;
 758                 }
 759         }
 760
 761         /**
 762          * @param int $audience One of:
 763          *   Revision::FOR_PUBLIC       to be displayed to all users
 764          *   Revision::FOR_THIS_USER    to be displayed to the given user
 765          *   Revision::RAW              get the text regardless of permissions
 766          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 767          *   to the $audience parameter
 768          * @return string Username of the user that made the last article revision
 769          */
 770         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 771                 $this->loadLastEdit();
 772                 if ( $this->mLastRevision ) {
 773                         return $this->mLastRevision->getUserText( $audience, $user );
 774                 } else {
 775                         return '';
 776                 }
 777         }
 778
 779         /**
 780          * @param int $audience One of:
 781          *   Revision::FOR_PUBLIC       to be displayed to all users
 782          *   Revision::FOR_THIS_USER    to be displayed to the given user
 783          *   Revision::RAW              get the text regardless of permissions
 784          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 785          *   to the $audience parameter
 786          * @return string Comment stored for the last article revision
 787          */
 788         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 789                 $this->loadLastEdit();
 790                 if ( $this->mLastRevision ) {
 791                         return $this->mLastRevision->getComment( $audience, $user );
 792                 } else {
 793                         return '';
 794                 }
 795         }
 796
 797         /**
 798          * Returns true if last revision was marked as "minor edit"
 799          *
 800          * @return bool Minor edit indicator for the last article revision.
 801          */
 802         public function getMinorEdit() {
 803                 $this->loadLastEdit();
 804                 if ( $this->mLastRevision ) {
 805                         return $this->mLastRevision->isMinor();
 806                 } else {
 807                         return false;
 808                 }
 809         }
 810
 811         /**
 812          * Determine whether a page would be suitable for being counted as an
 813          * article in the site_stats table based on the title & its content
 814          *
 815          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 816          *   if false, the current database state will be used
 817          * @return bool
 818          */
 819         public function isCountable( $editInfo = false ) {
 820                 global $wgArticleCountMethod;
 821
 822                 if ( !$this->mTitle->isContentPage() ) {
 823                         return false;
 824                 }
 825
 826                 if ( $editInfo ) {
 827                         $content = $editInfo->pstContent;
 828                 } else {
 829                         $content = $this->getContent();
 830                 }
 831
 832                 if ( !$content || $content->isRedirect() ) {
 833                         return false;
 834                 }
 835
 836                 $hasLinks = null;
 837
 838                 if ( $wgArticleCountMethod === 'link' ) {
 839                         // nasty special case to avoid re-parsing to detect links
 840
 841                         if ( $editInfo ) {
 842                                 // ParserOutput::getLinks() is a 2D array of page links, so
 843                                 // to be really correct we would need to recurse in the array
 844                                 // but the main array should only have items in it if there are
 845                                 // links.
 846                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 847                         } else {
 848                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 849                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 850                         }
 851                 }
 852
 853                 return $content->isCountable( $hasLinks );
 854         }
 855
 856         /**
 857          * If this page is a redirect, get its target
 858          *
 859          * The target will be fetched from the redirect table if possible.
 860          * If this page doesn't have an entry there, call insertRedirect()
 861          * @return Title|null Title object, or null if this page is not a redirect
 862          */
 863         public function getRedirectTarget() {
 864                 if ( !$this->mTitle->isRedirect() ) {
 865                         return null;
 866                 }
 867
 868                 if ( $this->mRedirectTarget !== null ) {
 869                         return $this->mRedirectTarget;
 870                 }
 871
 872                 // Query the redirect table
 873                 $dbr = wfGetDB( DB_SLAVE );
 874                 $row = $dbr->selectRow( 'redirect',
 875                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 876                         array( 'rd_from' => $this->getId() ),
 877                         __METHOD__
 878                 );
 879
 880                 // rd_fragment and rd_interwiki were added later, populate them if empty
 881                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 882                         $this->mRedirectTarget = Title::makeTitle(
 883                                 $row->rd_namespace, $row->rd_title,
 884                                 $row->rd_fragment, $row->rd_interwiki );
 885                         return $this->mRedirectTarget;
 886                 }
 887
 888                 // This page doesn't have an entry in the redirect table
 889                 $this->mRedirectTarget = $this->insertRedirect();
 890                 return $this->mRedirectTarget;
 891         }
 892
 893         /**
 894          * Insert an entry for this page into the redirect table.
 895          *
 896          * Don't call this function directly unless you know what you're doing.
 897          * @return Title|null Title object or null if not a redirect
 898          */
 899         public function insertRedirect() {
 900                 // recurse through to only get the final target
 901                 $content = $this->getContent();
 902                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 903                 if ( !$retval ) {
 904                         return null;
 905                 }
 906                 $this->insertRedirectEntry( $retval );
 907                 return $retval;
 908         }
 909
 910         /**
 911          * Insert or update the redirect table entry for this page to indicate
 912          * it redirects to $rt .
 913          * @param Title $rt Redirect target
 914          */
 915         public function insertRedirectEntry( $rt ) {
 916                 $dbw = wfGetDB( DB_MASTER );
 917                 $dbw->replace( 'redirect', array( 'rd_from' ),
 918                         array(
 919                                 'rd_from' => $this->getId(),
 920                                 'rd_namespace' => $rt->getNamespace(),
 921                                 'rd_title' => $rt->getDBkey(),
 922                                 'rd_fragment' => $rt->getFragment(),
 923                                 'rd_interwiki' => $rt->getInterwiki(),
 924                         ),
 925                         __METHOD__
 926                 );
 927         }
 928
 929         /**
 930          * Get the Title object or URL this page redirects to
 931          *
 932          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 933          */
 934         public function followRedirect() {
 935                 return $this->getRedirectURL( $this->getRedirectTarget() );
 936         }
 937
 938         /**
 939          * Get the Title object or URL to use for a redirect. We use Title
 940          * objects for same-wiki, non-special redirects and URLs for everything
 941          * else.
 942          * @param Title $rt Redirect target
 943          * @return bool|Title|string False, Title object of local target, or string with URL
 944          */
 945         public function getRedirectURL( $rt ) {
 946                 if ( !$rt ) {
 947                         return false;
 948                 }
 949
 950                 if ( $rt->isExternal() ) {
 951                         if ( $rt->isLocal() ) {
 952                                 // Offsite wikis need an HTTP redirect.
 953                                 // This can be hard to reverse and may produce loops,
 954                                 // so they may be disabled in the site configuration.
 955                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 956                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 957                         } else {
 958                                 // External pages without "local" bit set are not valid
 959                                 // redirect targets
 960                                 return false;
 961                         }
 962                 }
 963
 964                 if ( $rt->isSpecialPage() ) {
 965                         // Gotta handle redirects to special pages differently:
 966                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 967                         // Some pages are not valid targets.
 968                         if ( $rt->isValidRedirectTarget() ) {
 969                                 return $rt->getFullURL();
 970                         } else {
 971                                 return false;
 972                         }
 973                 }
 974
 975                 return $rt;
 976         }
 977
 978         /**
 979          * Get a list of users who have edited this article, not including the user who made
 980          * the most recent revision, which you can get from $article->getUser() if you want it
 981          * @return UserArrayFromResult
 982          */
 983         public function getContributors() {
 984                 // @todo FIXME: This is expensive; cache this info somewhere.
 985
 986                 $dbr = wfGetDB( DB_SLAVE );
 987
 988                 if ( $dbr->implicitGroupby() ) {
 989                         $realNameField = 'user_real_name';
 990                 } else {
 991                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 992                 }
 993
 994                 $tables = array( 'revision', 'user' );
 995
 996                 $fields = array(
 997                         'user_id' => 'rev_user',
 998                         'user_name' => 'rev_user_text',
 999                         $realNameField,
1000                         'timestamp' => 'MAX(rev_timestamp)',
1001                 );
1002
1003                 $conds = array( 'rev_page' => $this->getId() );
1004
1005                 // The user who made the top revision gets credited as "this page was last edited by
1006                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1007                 $user = $this->getUser();
1008                 if ( $user ) {
1009                         $conds[] = "rev_user != $user";
1010                 } else {
1011                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1012                 }
1013
1014                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1015
1016                 $jconds = array(
1017                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1018                 );
1019
1020                 $options = array(
1021                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1022                         'ORDER BY' => 'timestamp DESC',
1023                 );
1024
1025                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1026                 return new UserArrayFromResult( $res );
1027         }
1028
1029         /**
1030          * Get the last N authors
1031          * @param int $num Number of revisions to get
1032          * @param int|string $revLatest The latest rev_id, selected from the master (optional)
1033          * @return array Array of authors, duplicates not removed
1034          */
1035         public function getLastNAuthors( $num, $revLatest = 0 ) {
1036                 // First try the slave
1037                 // If that doesn't have the latest revision, try the master
1038                 $continue = 2;
1039                 $db = wfGetDB( DB_SLAVE );
1040
1041                 do {
1042                         $res = $db->select( array( 'page', 'revision' ),
1043                                 array( 'rev_id', 'rev_user_text' ),
1044                                 array(
1045                                         'page_namespace' => $this->mTitle->getNamespace(),
1046                                         'page_title' => $this->mTitle->getDBkey(),
1047                                         'rev_page = page_id'
1048                                 ), __METHOD__,
1049                                 array(
1050                                         'ORDER BY' => 'rev_timestamp DESC',
1051                                         'LIMIT' => $num
1052                                 )
1053                         );
1054
1055                         if ( !$res ) {
1056                                 return array();
1057                         }
1058
1059                         $row = $db->fetchObject( $res );
1060
1061                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1062                                 $db = wfGetDB( DB_MASTER );
1063                                 $continue--;
1064                         } else {
1065                                 $continue = 0;
1066                         }
1067                 } while ( $continue );
1068
1069                 $authors = array( $row->rev_user_text );
1070
1071                 foreach ( $res as $row ) {
1072                         $authors[] = $row->rev_user_text;
1073                 }
1074
1075                 return $authors;
1076         }
1077
1078         /**
1079          * Should the parser cache be used?
1080          *
1081          * @param ParserOptions $parserOptions ParserOptions to check
1082          * @param int $oldId
1083          * @return bool
1084          */
1085         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1086                 return $parserOptions->getStubThreshold() == 0
1087                         && $this->exists()
1088                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1089                         && $this->getContentHandler()->isParserCacheSupported();
1090         }
1091
1092         /**
1093          * Get a ParserOutput for the given ParserOptions and revision ID.
1094          * The parser cache will be used if possible.
1095          *
1096          * @since 1.19
1097          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1098          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1099          *   get the current revision (default value)
1100          *
1101          * @return ParserOutput|bool ParserOutput or false if the revision was not found
1102          */
1103         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1104
1105                 $useParserCache = $this->shouldCheckParserCache( $parserOptions, $oldid );
1106                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1107                 if ( $parserOptions->getStubThreshold() ) {
1108                         wfIncrStats( 'pcache.miss.stub' );
1109                 }
1110
1111                 if ( $useParserCache ) {
1112                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1113                         if ( $parserOutput !== false ) {
1114                                 return $parserOutput;
1115                         }
1116                 }
1117
1118                 if ( $oldid === null || $oldid === 0 ) {
1119                         $oldid = $this->getLatest();
1120                 }
1121
1122                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1123                 $pool->execute();
1124
1125                 return $pool->getParserOutput();
1126         }
1127
1128         /**
1129          * Do standard deferred updates after page view (existing or missing page)
1130          * @param User $user The relevant user
1131          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1132          */
1133         public function doViewUpdates( User $user, $oldid = 0 ) {
1134                 if ( wfReadOnly() ) {
1135                         return;
1136                 }
1137
1138                 Hooks::run( 'PageViewUpdates', array( $this, $user ) );
1139                 // Update newtalk / watchlist notification status
1140                 try {
1141                         $user->clearNotification( $this->mTitle, $oldid );
1142                 } catch ( DBError $e ) {
1143                         // Avoid outage if the master is not reachable
1144                         MWExceptionHandler::logException( $e );
1145                 }
1146         }
1147
1148         /**
1149          * Perform the actions of a page purging
1150          * @return bool
1151          */
1152         public function doPurge() {
1153                 if ( !Hooks::run( 'ArticlePurge', array( &$this ) ) ) {
1154                         return false;
1155                 }
1156
1157                 $title = $this->mTitle;
1158                 wfGetDB( DB_MASTER )->onTransactionIdle( function() use ( $title ) {
1159                         global $wgUseSquid;
1160                         // Invalidate the cache in auto-commit mode
1161                         $title->invalidateCache();
1162                         if ( $wgUseSquid ) {
1163                                 // Send purge now that page_touched update was committed above
1164                                 $update = SquidUpdate::newSimplePurge( $title );
1165                                 $update->doUpdate();
1166                         }
1167                 } );
1168
1169                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1170                         // @todo move this logic to MessageCache
1171                         if ( $this->exists() ) {
1172                                 // NOTE: use transclusion text for messages.
1173                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1174
1175                                 $content = $this->getContent();
1176                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1177
1178                                 if ( $text === null ) {
1179                                         $text = false;
1180                                 }
1181                         } else {
1182                                 $text = false;
1183                         }
1184
1185                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1186                 }
1187
1188                 return true;
1189         }
1190
1191         /**
1192          * Insert a new empty page record for this article.
1193          * This *must* be followed up by creating a revision
1194          * and running $this->updateRevisionOn( ... );
1195          * or else the record will be left in a funky state.
1196          * Best if all done inside a transaction.
1197          *
1198          * @param DatabaseBase $dbw
1199          * @return int|bool The newly created page_id key; false if the title already existed
1200          */
1201         public function insertOn( $dbw ) {
1202                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1203                 $dbw->insert( 'page', array(
1204                         'page_id'           => $page_id,
1205                         'page_namespace'    => $this->mTitle->getNamespace(),
1206                         'page_title'        => $this->mTitle->getDBkey(),
1207                         'page_restrictions' => '',
1208                         'page_is_redirect'  => 0, // Will set this shortly...
1209                         'page_is_new'       => 1,
1210                         'page_random'       => wfRandom(),
1211                         'page_touched'      => $dbw->timestamp(),
1212                         'page_latest'       => 0, // Fill this in shortly...
1213                         'page_len'          => 0, // Fill this in shortly...
1214                 ), __METHOD__, 'IGNORE' );
1215
1216                 $affected = $dbw->affectedRows();
1217
1218                 if ( $affected ) {
1219                         $newid = $dbw->insertId();
1220                         $this->mId = $newid;
1221                         $this->mTitle->resetArticleID( $newid );
1222
1223                         return $newid;
1224                 } else {
1225                         return false;
1226                 }
1227         }
1228
1229         /**
1230          * Update the page record to point to a newly saved revision.
1231          *
1232          * @param DatabaseBase $dbw
1233          * @param Revision $revision For ID number, and text used to set
1234          *   length and redirect status fields
1235          * @param int $lastRevision If given, will not overwrite the page field
1236          *   when different from the currently set value.
1237          *   Giving 0 indicates the new page flag should be set on.
1238          * @param bool $lastRevIsRedirect If given, will optimize adding and
1239          *   removing rows in redirect table.
1240          * @return bool True on success, false on failure
1241          */
1242         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1243                 $lastRevIsRedirect = null
1244         ) {
1245                 global $wgContentHandlerUseDB;
1246
1247                 // Assertion to try to catch T92046
1248                 if ( (int)$revision->getId() === 0 ) {
1249                         throw new InvalidArgumentException(
1250                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1251                         );
1252                 }
1253
1254                 $content = $revision->getContent();
1255                 $len = $content ? $content->getSize() : 0;
1256                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1257
1258                 $conditions = array( 'page_id' => $this->getId() );
1259
1260                 if ( !is_null( $lastRevision ) ) {
1261                         // An extra check against threads stepping on each other
1262                         $conditions['page_latest'] = $lastRevision;
1263                 }
1264
1265                 $row = array( /* SET */
1266                         'page_latest'      => $revision->getId(),
1267                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1268                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1269                         'page_is_redirect' => $rt !== null ? 1 : 0,
1270                         'page_len'         => $len,
1271                 );
1272
1273                 if ( $wgContentHandlerUseDB ) {
1274                         $row['page_content_model'] = $revision->getContentModel();
1275                 }
1276
1277                 $dbw->update( 'page',
1278                         $row,
1279                         $conditions,
1280                         __METHOD__ );
1281
1282                 $result = $dbw->affectedRows() > 0;
1283                 if ( $result ) {
1284                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1285                         $this->setLastEdit( $revision );
1286                         $this->mLatest = $revision->getId();
1287                         $this->mIsRedirect = (bool)$rt;
1288                         // Update the LinkCache.
1289                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1290                                                                                                         $this->mLatest, $revision->getContentModel() );
1291                 }
1292
1293                 return $result;
1294         }
1295
1296         /**
1297          * Add row to the redirect table if this is a redirect, remove otherwise.
1298          *
1299          * @param DatabaseBase $dbw
1300          * @param Title $redirectTitle Title object pointing to the redirect target,
1301          *   or NULL if this is not a redirect
1302          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1303          *   removing rows in redirect table.
1304          * @return bool True on success, false on failure
1305          * @private
1306          */
1307         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1308                 // Always update redirects (target link might have changed)
1309                 // Update/Insert if we don't know if the last revision was a redirect or not
1310                 // Delete if changing from redirect to non-redirect
1311                 $isRedirect = !is_null( $redirectTitle );
1312
1313                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1314                         return true;
1315                 }
1316
1317                 if ( $isRedirect ) {
1318                         $this->insertRedirectEntry( $redirectTitle );
1319                 } else {
1320                         // This is not a redirect, remove row from redirect table
1321                         $where = array( 'rd_from' => $this->getId() );
1322                         $dbw->delete( 'redirect', $where, __METHOD__ );
1323                 }
1324
1325                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1326                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1327                 }
1328
1329                 return ( $dbw->affectedRows() != 0 );
1330         }
1331
1332         /**
1333          * If the given revision is newer than the currently set page_latest,
1334          * update the page record. Otherwise, do nothing.
1335          *
1336          * @deprecated since 1.24, use updateRevisionOn instead
1337          *
1338          * @param DatabaseBase $dbw
1339          * @param Revision $revision
1340          * @return bool
1341          */
1342         public function updateIfNewerOn( $dbw, $revision ) {
1343
1344                 $row = $dbw->selectRow(
1345                         array( 'revision', 'page' ),
1346                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1347                         array(
1348                                 'page_id' => $this->getId(),
1349                                 'page_latest=rev_id' ),
1350                         __METHOD__ );
1351
1352                 if ( $row ) {
1353                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1354                                 return false;
1355                         }
1356                         $prev = $row->rev_id;
1357                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1358                 } else {
1359                         // No or missing previous revision; mark the page as new
1360                         $prev = 0;
1361                         $lastRevIsRedirect = null;
1362                 }
1363
1364                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1365
1366                 return $ret;
1367         }
1368
1369         /**
1370          * Get the content that needs to be saved in order to undo all revisions
1371          * between $undo and $undoafter. Revisions must belong to the same page,
1372          * must exist and must not be deleted
1373          * @param Revision $undo
1374          * @param Revision $undoafter Must be an earlier revision than $undo
1375          * @return mixed String on success, false on failure
1376          * @since 1.21
1377          * Before we had the Content object, this was done in getUndoText
1378          */
1379         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1380                 $handler = $undo->getContentHandler();
1381                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1382         }
1383
1384         /**
1385          * Get the text that needs to be saved in order to undo all revisions
1386          * between $undo and $undoafter. Revisions must belong to the same page,
1387          * must exist and must not be deleted
1388          * @param Revision $undo
1389          * @param Revision $undoafter Must be an earlier revision than $undo
1390          * @return string|bool String on success, false on failure
1391          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1392          */
1393         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1394                 ContentHandler::deprecated( __METHOD__, '1.21' );
1395
1396                 $this->loadLastEdit();
1397
1398                 if ( $this->mLastRevision ) {
1399                         if ( is_null( $undoafter ) ) {
1400                                 $undoafter = $undo->getPrevious();
1401                         }
1402
1403                         $handler = $this->getContentHandler();
1404                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1405
1406                         if ( !$undone ) {
1407                                 return false;
1408                         } else {
1409                                 return ContentHandler::getContentText( $undone );
1410                         }
1411                 }
1412
1413                 return false;
1414         }
1415
1416         /**
1417          * @param string|number|null|bool $sectionId Section identifier as a number or string
1418          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1419          * or 'new' for a new section.
1420          * @param string $text New text of the section.
1421          * @param string $sectionTitle New section's subject, only if $section is "new".
1422          * @param string $edittime Revision timestamp or null to use the current revision.
1423          *
1424          * @throws MWException
1425          * @return string New complete article text, or null if error.
1426          *
1427          * @deprecated since 1.21, use replaceSectionAtRev() instead
1428          */
1429         public function replaceSection( $sectionId, $text, $sectionTitle = '',
1430                 $edittime = null
1431         ) {
1432                 ContentHandler::deprecated( __METHOD__, '1.21' );
1433
1434                 // NOTE: keep condition in sync with condition in replaceSectionContent!
1435                 if ( strval( $sectionId ) === '' ) {
1436                         // Whole-page edit; let the whole text through
1437                         return $text;
1438                 }
1439
1440                 if ( !$this->supportsSections() ) {
1441                         throw new MWException( "sections not supported for content model " .
1442                                 $this->getContentHandler()->getModelID() );
1443                 }
1444
1445                 // could even make section title, but that's not required.
1446                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1447
1448                 $newContent = $this->replaceSectionContent( $sectionId, $sectionContent, $sectionTitle,
1449                         $edittime );
1450
1451                 return ContentHandler::getContentText( $newContent );
1452         }
1453
1454         /**
1455          * Returns true if this page's content model supports sections.
1456          *
1457          * @return bool
1458          *
1459          * @todo The skin should check this and not offer section functionality if
1460          *   sections are not supported.
1461          * @todo The EditPage should check this and not offer section functionality
1462          *   if sections are not supported.
1463          */
1464         public function supportsSections() {
1465                 return $this->getContentHandler()->supportsSections();
1466         }
1467
1468         /**
1469          * @param string|number|null|bool $sectionId Section identifier as a number or string
1470          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1471          * or 'new' for a new section.
1472          * @param Content $sectionContent New content of the section.
1473          * @param string $sectionTitle New section's subject, only if $section is "new".
1474          * @param string $edittime Revision timestamp or null to use the current revision.
1475          *
1476          * @throws MWException
1477          * @return Content New complete article content, or null if error.
1478          *
1479          * @since 1.21
1480          * @deprecated since 1.24, use replaceSectionAtRev instead
1481          */
1482         public function replaceSectionContent( $sectionId, Content $sectionContent, $sectionTitle = '',
1483                 $edittime = null ) {
1484
1485                 $baseRevId = null;
1486                 if ( $edittime && $sectionId !== 'new' ) {
1487                         $dbr = wfGetDB( DB_SLAVE );
1488                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1489                         // Try the master if this thread may have just added it.
1490                         // This could be abstracted into a Revision method, but we don't want
1491                         // to encourage loading of revisions by timestamp.
1492                         if ( !$rev
1493                                 && wfGetLB()->getServerCount() > 1
1494                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1495                         ) {
1496                                 $dbw = wfGetDB( DB_MASTER );
1497                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1498                         }
1499                         if ( $rev ) {
1500                                 $baseRevId = $rev->getId();
1501                         }
1502                 }
1503
1504                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1505         }
1506
1507         /**
1508          * @param string|number|null|bool $sectionId Section identifier as a number or string
1509          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1510          * or 'new' for a new section.
1511          * @param Content $sectionContent New content of the section.
1512          * @param string $sectionTitle New section's subject, only if $section is "new".
1513          * @param int|null $baseRevId
1514          *
1515          * @throws MWException
1516          * @return Content New complete article content, or null if error.
1517          *
1518          * @since 1.24
1519          */
1520         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1521                 $sectionTitle = '', $baseRevId = null
1522         ) {
1523
1524                 if ( strval( $sectionId ) === '' ) {
1525                         // Whole-page edit; let the whole text through
1526                         $newContent = $sectionContent;
1527                 } else {
1528                         if ( !$this->supportsSections() ) {
1529                                 throw new MWException( "sections not supported for content model " .
1530                                         $this->getContentHandler()->getModelID() );
1531                         }
1532
1533                         // Bug 30711: always use current version when adding a new section
1534                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1535                                 $oldContent = $this->getContent();
1536                         } else {
1537                                 $rev = Revision::newFromId( $baseRevId );
1538                                 if ( !$rev ) {
1539                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1540                                                 $this->getId() . "; section: $sectionId)\n" );
1541                                         return null;
1542                                 }
1543
1544                                 $oldContent = $rev->getContent();
1545                         }
1546
1547                         if ( !$oldContent ) {
1548                                 wfDebug( __METHOD__ . ": no page text\n" );
1549                                 return null;
1550                         }
1551
1552                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1553                 }
1554
1555                 return $newContent;
1556         }
1557
1558         /**
1559          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1560          * @param int $flags
1561          * @return int Updated $flags
1562          */
1563         public function checkFlags( $flags ) {
1564                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1565                         if ( $this->exists() ) {
1566                                 $flags |= EDIT_UPDATE;
1567                         } else {
1568                                 $flags |= EDIT_NEW;
1569                         }
1570                 }
1571
1572                 return $flags;
1573         }
1574
1575         /**
1576          * Change an existing article or create a new article. Updates RC and all necessary caches,
1577          * optionally via the deferred update array.
1578          *
1579          * @param string $text New text
1580          * @param string $summary Edit summary
1581          * @param int $flags Bitfield:
1582          *      EDIT_NEW
1583          *          Article is known or assumed to be non-existent, create a new one
1584          *      EDIT_UPDATE
1585          *          Article is known or assumed to be pre-existing, update it
1586          *      EDIT_MINOR
1587          *          Mark this edit minor, if the user is allowed to do so
1588          *      EDIT_SUPPRESS_RC
1589          *          Do not log the change in recentchanges
1590          *      EDIT_FORCE_BOT
1591          *          Mark the edit a "bot" edit regardless of user rights
1592          *      EDIT_DEFER_UPDATES
1593          *          Defer some of the updates until the end of index.php
1594          *      EDIT_AUTOSUMMARY
1595          *          Fill in blank summaries with generated text where possible
1596          *
1597          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1598          * article will be detected. If EDIT_UPDATE is specified and the article
1599          * doesn't exist, the function will return an edit-gone-missing error. If
1600          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1601          * error will be returned. These two conditions are also possible with
1602          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1603          *
1604          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1605          *   This is not the parent revision ID, rather the revision ID for older
1606          *   content used as the source for a rollback, for example.
1607          * @param User $user The user doing the edit
1608          *
1609          * @throws MWException
1610          * @return Status Possible errors:
1611          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1612          *     set the fatal flag of $status
1613          *   edit-gone-missing: In update mode, but the article didn't exist.
1614          *   edit-conflict: In update mode, the article changed unexpectedly.
1615          *   edit-no-change: Warning that the text was the same as before.
1616          *   edit-already-exists: In creation mode, but the article already exists.
1617          *
1618          * Extensions may define additional errors.
1619          *
1620          * $return->value will contain an associative array with members as follows:
1621          *     new: Boolean indicating if the function attempted to create a new article.
1622          *     revision: The revision object for the inserted revision, or null.
1623          *
1624          * Compatibility note: this function previously returned a boolean value
1625          * indicating success/failure
1626          *
1627          * @deprecated since 1.21: use doEditContent() instead.
1628          */
1629         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1630                 ContentHandler::deprecated( __METHOD__, '1.21' );
1631
1632                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1633
1634                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1635         }
1636
1637         /**
1638          * Change an existing article or create a new article. Updates RC and all necessary caches,
1639          * optionally via the deferred update array.
1640          *
1641          * @param Content $content New content
1642          * @param string $summary Edit summary
1643          * @param int $flags Bitfield:
1644          *      EDIT_NEW
1645          *          Article is known or assumed to be non-existent, create a new one
1646          *      EDIT_UPDATE
1647          *          Article is known or assumed to be pre-existing, update it
1648          *      EDIT_MINOR
1649          *          Mark this edit minor, if the user is allowed to do so
1650          *      EDIT_SUPPRESS_RC
1651          *          Do not log the change in recentchanges
1652          *      EDIT_FORCE_BOT
1653          *          Mark the edit a "bot" edit regardless of user rights
1654          *      EDIT_DEFER_UPDATES
1655          *          Defer some of the updates until the end of index.php
1656          *      EDIT_AUTOSUMMARY
1657          *          Fill in blank summaries with generated text where possible
1658          *
1659          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1660          * article will be detected. If EDIT_UPDATE is specified and the article
1661          * doesn't exist, the function will return an edit-gone-missing error. If
1662          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1663          * error will be returned. These two conditions are also possible with
1664          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1665          *
1666          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1667          *   This is not the parent revision ID, rather the revision ID for older
1668          *   content used as the source for a rollback, for example.
1669          * @param User $user The user doing the edit
1670          * @param string $serialFormat Format for storing the content in the
1671          *   database.
1672          *
1673          * @throws MWException
1674          * @return Status Possible errors:
1675          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1676          *       set the fatal flag of $status.
1677          *     edit-gone-missing: In update mode, but the article didn't exist.
1678          *     edit-conflict: In update mode, the article changed unexpectedly.
1679          *     edit-no-change: Warning that the text was the same as before.
1680          *     edit-already-exists: In creation mode, but the article already exists.
1681          *
1682          *  Extensions may define additional errors.
1683          *
1684          *  $return->value will contain an associative array with members as follows:
1685          *     new: Boolean indicating if the function attempted to create a new article.
1686          *     revision: The revision object for the inserted revision, or null.
1687          *
1688          * @since 1.21
1689          * @throws MWException
1690          */
1691         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1692                 User $user = null, $serialFormat = null
1693         ) {
1694                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1695
1696                 // Low-level sanity check
1697                 if ( $this->mTitle->getText() === '' ) {
1698                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1699                 }
1700
1701                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1702                         return Status::newFatal( 'content-not-allowed-here',
1703                                 ContentHandler::getLocalizedName( $content->getModel() ),
1704                                 $this->getTitle()->getPrefixedText() );
1705                 }
1706
1707                 $user = is_null( $user ) ? $wgUser : $user;
1708                 $status = Status::newGood( array() );
1709
1710                 // Load the data from the master database if needed.
1711                 // The caller may already loaded it from the master or even loaded it using
1712                 // SELECT FOR UPDATE, so do not override that using clear().
1713                 $this->loadPageData( 'fromdbmaster' );
1714
1715                 $flags = $this->checkFlags( $flags );
1716
1717                 // handle hook
1718                 $hook_args = array( &$this, &$user, &$content, &$summary,
1719                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1720
1721                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1722                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1723
1724                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1725
1726                         if ( $status->isOK() ) {
1727                                 $status->fatal( 'edit-hook-aborted' );
1728                         }
1729
1730                         return $status;
1731                 }
1732
1733                 // Silently ignore EDIT_MINOR if not allowed
1734                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1735                 $bot = $flags & EDIT_FORCE_BOT;
1736
1737                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1738
1739                 $oldsize = $old_content ? $old_content->getSize() : 0;
1740                 $oldid = $this->getLatest();
1741                 $oldIsRedirect = $this->isRedirect();
1742                 $oldcountable = $this->isCountable();
1743
1744                 $handler = $content->getContentHandler();
1745
1746                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1747                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1748                         if ( !$old_content ) {
1749                                 $old_content = null;
1750                         }
1751                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1752                 }
1753
1754                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat );
1755                 $serialized = $editInfo->pst;
1756
1757                 /**
1758                  * @var Content $content
1759                  */
1760                 $content = $editInfo->pstContent;
1761                 $newsize = $content->getSize();
1762
1763                 $dbw = wfGetDB( DB_MASTER );
1764                 $now = wfTimestampNow();
1765
1766                 if ( $flags & EDIT_UPDATE ) {
1767                         // Update article, but only if changed.
1768                         $status->value['new'] = false;
1769
1770                         if ( !$oldid ) {
1771                                 // Article gone missing
1772                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1773                                 $status->fatal( 'edit-gone-missing' );
1774
1775                                 return $status;
1776                         } elseif ( !$old_content ) {
1777                                 // Sanity check for bug 37225
1778                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1779                         }
1780
1781                         $revision = new Revision( array(
1782                                 'page'       => $this->getId(),
1783                                 'title'      => $this->getTitle(), // for determining the default content model
1784                                 'comment'    => $summary,
1785                                 'minor_edit' => $isminor,
1786                                 'text'       => $serialized,
1787                                 'len'        => $newsize,
1788                                 'parent_id'  => $oldid,
1789                                 'user'       => $user->getId(),
1790                                 'user_text'  => $user->getName(),
1791                                 'timestamp'  => $now,
1792                                 'content_model' => $content->getModel(),
1793                                 'content_format' => $serialFormat,
1794                         ) ); // XXX: pass content object?!
1795
1796                         $changed = !$content->equals( $old_content );
1797
1798                         if ( $changed ) {
1799                                 $dbw->begin( __METHOD__ );
1800
1801                                 $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1802                                 $status->merge( $prepStatus );
1803
1804                                 if ( !$status->isOK() ) {
1805                                         $dbw->rollback( __METHOD__ );
1806
1807                                         return $status;
1808                                 }
1809                                 $revisionId = $revision->insertOn( $dbw );
1810
1811                                 // Update page.
1812                                 // We check for conflicts by comparing $oldid with the current latest revision ID.
1813                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1814
1815                                 if ( !$ok ) {
1816                                         // Belated edit conflict! Run away!!
1817                                         $status->fatal( 'edit-conflict' );
1818
1819                                         $dbw->rollback( __METHOD__ );
1820
1821                                         return $status;
1822                                 }
1823
1824                                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1825
1826                                 // Update recentchanges
1827                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1828                                         // Mark as patrolled if the user can do so
1829                                         $patrolled = $wgUseRCPatrol && !count(
1830                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1831                                         // Add RC row to the DB
1832                                         RecentChange::notifyEdit(
1833                                                 $now, $this->mTitle, $isminor, $user, $summary,
1834                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1835                                                 $revisionId, $patrolled
1836                                         );
1837                                 }
1838
1839                                 $user->incEditCount();
1840
1841                                 $dbw->commit( __METHOD__ );
1842                                 $this->mTimestamp = $now;
1843                         } else {
1844                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1845                                 // related variables correctly
1846                                 $revision->setId( $this->getLatest() );
1847                         }
1848
1849                         // Update links tables, site stats, etc.
1850                         $this->doEditUpdates(
1851                                 $revision,
1852                                 $user,
1853                                 array(
1854                                         'changed' => $changed,
1855                                         'oldcountable' => $oldcountable
1856                                 )
1857                         );
1858
1859                         if ( !$changed ) {
1860                                 $status->warning( 'edit-no-change' );
1861                                 $revision = null;
1862                                 // Update page_touched, this is usually implicit in the page update
1863                                 // Other cache updates are done in onArticleEdit()
1864                                 $this->mTitle->invalidateCache( $now );
1865                         }
1866                 } else {
1867                         // Create new article
1868                         $status->value['new'] = true;
1869
1870                         $dbw->begin( __METHOD__ );
1871
1872                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1873                         $status->merge( $prepStatus );
1874
1875                         if ( !$status->isOK() ) {
1876                                 $dbw->rollback( __METHOD__ );
1877
1878                                 return $status;
1879                         }
1880
1881                         $status->merge( $prepStatus );
1882
1883                         // Add the page record; stake our claim on this title!
1884                         // This will return false if the article already exists
1885                         $newid = $this->insertOn( $dbw );
1886
1887                         if ( $newid === false ) {
1888                                 $dbw->rollback( __METHOD__ );
1889                                 $status->fatal( 'edit-already-exists' );
1890
1891                                 return $status;
1892                         }
1893
1894                         // Save the revision text...
1895                         $revision = new Revision( array(
1896                                 'page'       => $newid,
1897                                 'title'      => $this->getTitle(), // for determining the default content model
1898                                 'comment'    => $summary,
1899                                 'minor_edit' => $isminor,
1900                                 'text'       => $serialized,
1901                                 'len'        => $newsize,
1902                                 'user'       => $user->getId(),
1903                                 'user_text'  => $user->getName(),
1904                                 'timestamp'  => $now,
1905                                 'content_model' => $content->getModel(),
1906                                 'content_format' => $serialFormat,
1907                         ) );
1908                         $revisionId = $revision->insertOn( $dbw );
1909
1910                         // Bug 37225: use accessor to get the text as Revision may trim it
1911                         $content = $revision->getContent(); // sanity; get normalized version
1912
1913                         if ( $content ) {
1914                                 $newsize = $content->getSize();
1915                         }
1916
1917                         // Update the page record with revision data
1918                         $this->updateRevisionOn( $dbw, $revision, 0 );
1919
1920                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1921
1922                         // Update recentchanges
1923                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1924                                 // Mark as patrolled if the user can do so
1925                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1926                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1927                                 // Add RC row to the DB
1928                                 RecentChange::notifyNew(
1929                                         $now, $this->mTitle, $isminor, $user, $summary, $bot,
1930                                         '', $newsize, $revisionId, $patrolled
1931                                 );
1932                         }
1933
1934                         $user->incEditCount();
1935
1936                         $dbw->commit( __METHOD__ );
1937                         $this->mTimestamp = $now;
1938
1939                         // Update links, etc.
1940                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1941
1942                         $hook_args = array( &$this, &$user, $content, $summary,
1943                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1944
1945                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1946                         Hooks::run( 'PageContentInsertComplete', $hook_args );
1947                 }
1948
1949                 // Do updates right now unless deferral was requested
1950                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1951                         DeferredUpdates::doUpdates();
1952                 }
1953
1954                 // Return the new revision (or null) to the caller
1955                 $status->value['revision'] = $revision;
1956
1957                 $hook_args = array( &$this, &$user, $content, $summary,
1958                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1959
1960                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1961                 Hooks::run( 'PageContentSaveComplete', $hook_args );
1962
1963                 // Promote user to any groups they meet the criteria for
1964                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1965                         $user->addAutopromoteOnceGroups( 'onEdit' );
1966                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1967                 } );
1968
1969                 return $status;
1970         }
1971
1972         /**
1973          * Get parser options suitable for rendering the primary article wikitext
1974          *
1975          * @see ContentHandler::makeParserOptions
1976          *
1977          * @param IContextSource|User|string $context One of the following:
1978          *        - IContextSource: Use the User and the Language of the provided
1979          *          context
1980          *        - User: Use the provided User object and $wgLang for the language,
1981          *          so use an IContextSource object if possible.
1982          *        - 'canonical': Canonical options (anonymous user with default
1983          *          preferences and content language).
1984          * @return ParserOptions
1985          */
1986         public function makeParserOptions( $context ) {
1987                 $options = $this->getContentHandler()->makeParserOptions( $context );
1988
1989                 if ( $this->getTitle()->isConversionTable() ) {
1990                         // @todo ConversionTable should become a separate content model, so
1991                         // we don't need special cases like this one.
1992                         $options->disableContentConversion();
1993                 }
1994
1995                 return $options;
1996         }
1997
1998         /**
1999          * Prepare text which is about to be saved.
2000          * Returns a stdClass with source, pst and output members
2001          *
2002          * @deprecated since 1.21: use prepareContentForEdit instead.
2003          * @return object
2004          */
2005         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2006                 ContentHandler::deprecated( __METHOD__, '1.21' );
2007                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2008                 return $this->prepareContentForEdit( $content, $revid, $user );
2009         }
2010
2011         /**
2012          * Prepare content which is about to be saved.
2013          * Returns a stdClass with source, pst and output members
2014          *
2015          * @param Content $content
2016          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2017          *        revision ID is also accepted, but this is deprecated.
2018          * @param User|null $user
2019          * @param string|null $serialFormat
2020          * @param bool $useCache Check shared prepared edit cache
2021          *
2022          * @return object
2023          *
2024          * @since 1.21
2025          */
2026         public function prepareContentForEdit(
2027                 Content $content, $revision = null, User $user = null, $serialFormat = null, $useCache = true
2028         ) {
2029                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2030
2031                 if ( is_object( $revision ) ) {
2032                         $revid = $revision->getId();
2033                 } else {
2034                         $revid = $revision;
2035                         // This code path is deprecated, and nothing is known to
2036                         // use it, so performance here shouldn't be a worry.
2037                         if ( $revid !== null ) {
2038                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2039                         } else {
2040                                 $revision = null;
2041                         }
2042                 }
2043
2044                 $user = is_null( $user ) ? $wgUser : $user;
2045                 // XXX: check $user->getId() here???
2046
2047                 // Use a sane default for $serialFormat, see bug 57026
2048                 if ( $serialFormat === null ) {
2049                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2050                 }
2051
2052                 if ( $this->mPreparedEdit
2053                         && $this->mPreparedEdit->newContent
2054                         && $this->mPreparedEdit->newContent->equals( $content )
2055                         && $this->mPreparedEdit->revid == $revid
2056                         && $this->mPreparedEdit->format == $serialFormat
2057                         // XXX: also check $user here?
2058                 ) {
2059                         // Already prepared
2060                         return $this->mPreparedEdit;
2061                 }
2062
2063                 // The edit may have already been prepared via api.php?action=stashedit
2064                 $cachedEdit = $useCache && $wgAjaxEditStash && !$user->isAllowed( 'bot' )
2065                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2066                         : false;
2067
2068                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2069                 Hooks::run( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2070
2071                 $edit = (object)array();
2072                 if ( $cachedEdit ) {
2073                         $edit->timestamp = $cachedEdit->timestamp;
2074                 } else {
2075                         $edit->timestamp = wfTimestampNow();
2076                 }
2077                 // @note: $cachedEdit is not used if the rev ID was referenced in the text
2078                 $edit->revid = $revid;
2079
2080                 if ( $cachedEdit ) {
2081                         $edit->pstContent = $cachedEdit->pstContent;
2082                 } else {
2083                         $edit->pstContent = $content
2084                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2085                                 : null;
2086                 }
2087
2088                 $edit->format = $serialFormat;
2089                 $edit->popts = $this->makeParserOptions( 'canonical' );
2090                 if ( $cachedEdit ) {
2091                         $edit->output = $cachedEdit->output;
2092                 } else {
2093                         if ( $revision ) {
2094                                 // We get here if vary-revision is set. This means that this page references
2095                                 // itself (such as via self-transclusion). In this case, we need to make sure
2096                                 // that any such self-references refer to the newly-saved revision, and not
2097                                 // to the previous one, which could otherwise happen due to slave lag.
2098                                 $oldCallback = $edit->popts->setCurrentRevisionCallback(
2099                                         function ( $title, $parser = false ) use ( $revision, &$oldCallback ) {
2100                                                 if ( $title->equals( $revision->getTitle() ) ) {
2101                                                         return $revision;
2102                                                 } else {
2103                                                         return call_user_func(
2104                                                                 $oldCallback,
2105                                                                 $title,
2106                                                                 $parser
2107                                                         );
2108                                                 }
2109                                         }
2110                                 );
2111                         }
2112                         $edit->output = $edit->pstContent
2113                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2114                                 : null;
2115                 }
2116
2117                 $edit->newContent = $content;
2118                 $edit->oldContent = $this->getContent( Revision::RAW );
2119
2120                 // NOTE: B/C for hooks! don't use these fields!
2121                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2122                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2123                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2124
2125                 $this->mPreparedEdit = $edit;
2126                 return $edit;
2127         }
2128
2129         /**
2130          * Do standard deferred updates after page edit.
2131          * Update links tables, site stats, search index and message cache.
2132          * Purges pages that include this page if the text was changed here.
2133          * Every 100th edit, prune the recent changes table.
2134          *
2135          * @param Revision $revision
2136          * @param User $user User object that did the revision
2137          * @param array $options Array of options, following indexes are used:
2138          * - changed: boolean, whether the revision changed the content (default true)
2139          * - created: boolean, whether the revision created the page (default false)
2140          * - moved: boolean, whether the page was moved (default false)
2141          * - oldcountable: boolean, null, or string 'no-change' (default null):
2142          *   - boolean: whether the page was counted as an article before that
2143          *     revision, only used in changed is true and created is false
2144          *   - null: if created is false, don't update the article count; if created
2145          *     is true, do update the article count
2146          *   - 'no-change': don't update the article count, ever
2147          */
2148         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2149                 $options += array(
2150                         'changed' => true,
2151                         'created' => false,
2152                         'moved' => false,
2153                         'oldcountable' => null
2154                 );
2155                 $content = $revision->getContent();
2156
2157                 // Parse the text
2158                 // Be careful not to do pre-save transform twice: $text is usually
2159                 // already pre-save transformed once.
2160                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2161                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2162                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user );
2163                 } else {
2164                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2165                         $editInfo = $this->mPreparedEdit;
2166                 }
2167
2168                 // Save it to the parser cache.
2169                 // Make sure the cache time matches page_touched to avoid double parsing.
2170                 ParserCache::singleton()->save(
2171                         $editInfo->output, $this, $editInfo->popts,
2172                         $revision->getTimestamp(), $editInfo->revid
2173                 );
2174
2175                 // Update the links tables and other secondary data
2176                 if ( $content ) {
2177                         $recursive = $options['changed']; // bug 50785
2178                         $updates = $content->getSecondaryDataUpdates(
2179                                 $this->getTitle(), null, $recursive, $editInfo->output );
2180                         foreach ( $updates as $update ) {
2181                                 DeferredUpdates::addUpdate( $update );
2182                         }
2183                 }
2184
2185                 Hooks::run( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2186
2187                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2188                         // Flush old entries from the `recentchanges` table
2189                         if ( mt_rand( 0, 9 ) == 0 ) {
2190                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2191                         }
2192                 }
2193
2194                 if ( !$this->exists() ) {
2195                         return;
2196                 }
2197
2198                 $id = $this->getId();
2199                 $title = $this->mTitle->getPrefixedDBkey();
2200                 $shortTitle = $this->mTitle->getDBkey();
2201
2202                 if ( $options['oldcountable'] === 'no-change' ||
2203                         ( !$options['changed'] && !$options['moved'] )
2204                 ) {
2205                         $good = 0;
2206                 } elseif ( $options['created'] ) {
2207                         $good = (int)$this->isCountable( $editInfo );
2208                 } elseif ( $options['oldcountable'] !== null ) {
2209                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2210                 } else {
2211                         $good = 0;
2212                 }
2213                 $edits = $options['changed'] ? 1 : 0;
2214                 $total = $options['created'] ? 1 : 0;
2215
2216                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2217                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2218
2219                 // If this is another user's talk page, update newtalk.
2220                 // Don't do this if $options['changed'] = false (null-edits) nor if
2221                 // it's a minor edit and the user doesn't want notifications for those.
2222                 if ( $options['changed']
2223                         && $this->mTitle->getNamespace() == NS_USER_TALK
2224                         && $shortTitle != $user->getTitleKey()
2225                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2226                 ) {
2227                         $recipient = User::newFromName( $shortTitle, false );
2228                         if ( !$recipient ) {
2229                                 wfDebug( __METHOD__ . ": invalid username\n" );
2230                         } else {
2231                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2232                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2233                                         if ( User::isIP( $shortTitle ) ) {
2234                                                 // An anonymous user
2235                                                 $recipient->setNewtalk( true, $revision );
2236                                         } elseif ( $recipient->isLoggedIn() ) {
2237                                                 $recipient->setNewtalk( true, $revision );
2238                                         } else {
2239                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2240                                         }
2241                                 }
2242                         }
2243                 }
2244
2245                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2246                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2247                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2248                         if ( $msgtext === false || $msgtext === null ) {
2249                                 $msgtext = '';
2250                         }
2251
2252                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2253                 }
2254
2255                 if ( $options['created'] ) {
2256                         self::onArticleCreate( $this->mTitle );
2257                 } elseif ( $options['changed'] ) { // bug 50785
2258                         self::onArticleEdit( $this->mTitle, $revision );
2259                 }
2260         }
2261
2262         /**
2263          * Edit an article without doing all that other stuff
2264          * The article must already exist; link tables etc
2265          * are not updated, caches are not flushed.
2266          *
2267          * @param string $text Text submitted
2268          * @param User $user The relevant user
2269          * @param string $comment Comment submitted
2270          * @param bool $minor Whereas it's a minor modification
2271          *
2272          * @deprecated since 1.21, use doEditContent() instead.
2273          */
2274         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2275                 ContentHandler::deprecated( __METHOD__, "1.21" );
2276
2277                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2278                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2279         }
2280
2281         /**
2282          * Edit an article without doing all that other stuff
2283          * The article must already exist; link tables etc
2284          * are not updated, caches are not flushed.
2285          *
2286          * @param Content $content Content submitted
2287          * @param User $user The relevant user
2288          * @param string $comment Comment submitted
2289          * @param bool $minor Whereas it's a minor modification
2290          * @param string $serialFormat Format for storing the content in the database
2291          */
2292         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2293                 $serialFormat = null
2294         ) {
2295
2296                 $serialized = $content->serialize( $serialFormat );
2297
2298                 $dbw = wfGetDB( DB_MASTER );
2299                 $revision = new Revision( array(
2300                         'title'      => $this->getTitle(), // for determining the default content model
2301                         'page'       => $this->getId(),
2302                         'user_text'  => $user->getName(),
2303                         'user'       => $user->getId(),
2304                         'text'       => $serialized,
2305                         'length'     => $content->getSize(),
2306                         'comment'    => $comment,
2307                         'minor_edit' => $minor ? 1 : 0,
2308                 ) ); // XXX: set the content object?
2309                 $revision->insertOn( $dbw );
2310                 $this->updateRevisionOn( $dbw, $revision );
2311
2312                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2313
2314         }
2315
2316         /**
2317          * Update the article's restriction field, and leave a log entry.
2318          * This works for protection both existing and non-existing pages.
2319          *
2320          * @param array $limit Set of restriction keys
2321          * @param array $expiry Per restriction type expiration
2322          * @param int &$cascade Set to false if cascading protection isn't allowed.
2323          * @param string $reason
2324          * @param User $user The user updating the restrictions
2325          * @return Status
2326          */
2327         public function doUpdateRestrictions( array $limit, array $expiry,
2328                 &$cascade, $reason, User $user
2329         ) {
2330                 global $wgCascadingRestrictionLevels, $wgContLang;
2331
2332                 if ( wfReadOnly() ) {
2333                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2334                 }
2335
2336                 $this->loadPageData( 'fromdbmaster' );
2337                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2338                 $id = $this->getId();
2339
2340                 if ( !$cascade ) {
2341                         $cascade = false;
2342                 }
2343
2344                 // Take this opportunity to purge out expired restrictions
2345                 Title::purgeExpiredRestrictions();
2346
2347                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2348                 // we expect a single selection, but the schema allows otherwise.
2349                 $isProtected = false;
2350                 $protect = false;
2351                 $changed = false;
2352
2353                 $dbw = wfGetDB( DB_MASTER );
2354
2355                 foreach ( $restrictionTypes as $action ) {
2356                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2357                                 $expiry[$action] = 'infinity';
2358                         }
2359                         if ( !isset( $limit[$action] ) ) {
2360                                 $limit[$action] = '';
2361                         } elseif ( $limit[$action] != '' ) {
2362                                 $protect = true;
2363                         }
2364
2365                         // Get current restrictions on $action
2366                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2367                         if ( $current != '' ) {
2368                                 $isProtected = true;
2369                         }
2370
2371                         if ( $limit[$action] != $current ) {
2372                                 $changed = true;
2373                         } elseif ( $limit[$action] != '' ) {
2374                                 // Only check expiry change if the action is actually being
2375                                 // protected, since expiry does nothing on an not-protected
2376                                 // action.
2377                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2378                                         $changed = true;
2379                                 }
2380                         }
2381                 }
2382
2383                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2384                         $changed = true;
2385                 }
2386
2387                 // If nothing has changed, do nothing
2388                 if ( !$changed ) {
2389                         return Status::newGood();
2390                 }
2391
2392                 if ( !$protect ) { // No protection at all means unprotection
2393                         $revCommentMsg = 'unprotectedarticle';
2394                         $logAction = 'unprotect';
2395                 } elseif ( $isProtected ) {
2396                         $revCommentMsg = 'modifiedarticleprotection';
2397                         $logAction = 'modify';
2398                 } else {
2399                         $revCommentMsg = 'protectedarticle';
2400                         $logAction = 'protect';
2401                 }
2402
2403                 // Truncate for whole multibyte characters
2404                 $reason = $wgContLang->truncate( $reason, 255 );
2405
2406                 $logRelationsValues = array();
2407                 $logRelationsField = null;
2408                 $logParamsDetails = array();
2409
2410                 if ( $id ) { // Protection of existing page
2411                         if ( !Hooks::run( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2412                                 return Status::newGood();
2413                         }
2414
2415                         // Only certain restrictions can cascade...
2416                         $editrestriction = isset( $limit['edit'] )
2417                                 ? array( $limit['edit'] )
2418                                 : $this->mTitle->getRestrictions( 'edit' );
2419                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2420                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2421                         }
2422                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2423                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2424                         }
2425
2426                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2427                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2428                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2429                         }
2430                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2431                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2432                         }
2433
2434                         // The schema allows multiple restrictions
2435                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2436                                 $cascade = false;
2437                         }
2438
2439                         // insert null revision to identify the page protection change as edit summary
2440                         $latest = $this->getLatest();
2441                         $nullRevision = $this->insertProtectNullRevision(
2442                                 $revCommentMsg,
2443                                 $limit,
2444                                 $expiry,
2445                                 $cascade,
2446                                 $reason,
2447                                 $user
2448                         );
2449
2450                         if ( $nullRevision === null ) {
2451                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2452                         }
2453
2454                         $logRelationsField = 'pr_id';
2455
2456                         // Update restrictions table
2457                         foreach ( $limit as $action => $restrictions ) {
2458                                 $dbw->delete(
2459                                         'page_restrictions',
2460                                         array(
2461                                                 'pr_page' => $id,
2462                                                 'pr_type' => $action
2463                                         ),
2464                                         __METHOD__
2465                                 );
2466                                 if ( $restrictions != '' ) {
2467                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2468                                         $dbw->insert(
2469                                                 'page_restrictions',
2470                                                 array(
2471                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2472                                                         'pr_page' => $id,
2473                                                         'pr_type' => $action,
2474                                                         'pr_level' => $restrictions,
2475                                                         'pr_cascade' => $cascadeValue,
2476                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2477                                                 ),
2478                                                 __METHOD__
2479                                         );
2480                                         $logRelationsValues[] = $dbw->insertId();
2481                                         $logParamsDetails[] = array(
2482                                                 'type' => $action,
2483                                                 'level' => $restrictions,
2484                                                 'expiry' => $expiry[$action],
2485                                                 'cascade' => (bool)$cascadeValue,
2486                                         );
2487                                 }
2488                         }
2489
2490                         // Clear out legacy restriction fields
2491                         $dbw->update(
2492                                 'page',
2493                                 array( 'page_restrictions' => '' ),
2494                                 array( 'page_id' => $id ),
2495                                 __METHOD__
2496                         );
2497
2498                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2499                         Hooks::run( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2500                 } else { // Protection of non-existing page (also known as "title protection")
2501                         // Cascade protection is meaningless in this case
2502                         $cascade = false;
2503
2504                         if ( $limit['create'] != '' ) {
2505                                 $dbw->replace( 'protected_titles',
2506                                         array( array( 'pt_namespace', 'pt_title' ) ),
2507                                         array(
2508                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2509                                                 'pt_title' => $this->mTitle->getDBkey(),
2510                                                 'pt_create_perm' => $limit['create'],
2511                                                 'pt_timestamp' => $dbw->timestamp(),
2512                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2513                                                 'pt_user' => $user->getId(),
2514                                                 'pt_reason' => $reason,
2515                                         ), __METHOD__
2516                                 );
2517                                 $logParamsDetails[] = array(
2518                                         'type' => 'create',
2519                                         'level' => $limit['create'],
2520                                         'expiry' => $expiry['create'],
2521                                 );
2522                         } else {
2523                                 $dbw->delete( 'protected_titles',
2524                                         array(
2525                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2526                                                 'pt_title' => $this->mTitle->getDBkey()
2527                                         ), __METHOD__
2528                                 );
2529                         }
2530                 }
2531
2532                 $this->mTitle->flushRestrictions();
2533                 InfoAction::invalidateCache( $this->mTitle );
2534
2535                 if ( $logAction == 'unprotect' ) {
2536                         $params = array();
2537                 } else {
2538                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2539                         $params = array(
2540                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2541                                 '5:bool:cascade' => $cascade,
2542                                 'details' => $logParamsDetails, // parameter for localize and api
2543                         );
2544                 }
2545
2546                 // Update the protection log
2547                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2548                 $logEntry->setTarget( $this->mTitle );
2549                 $logEntry->setComment( $reason );
2550                 $logEntry->setPerformer( $user );
2551                 $logEntry->setParameters( $params );
2552                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2553                         $logEntry->setRelations( array( $logRelationsField => $logRelationsValues ) );
2554                 }
2555                 $logId = $logEntry->insert();
2556                 $logEntry->publish( $logId );
2557
2558                 return Status::newGood();
2559         }
2560
2561         /**
2562          * Insert a new null revision for this page.
2563          *
2564          * @param string $revCommentMsg Comment message key for the revision
2565          * @param array $limit Set of restriction keys
2566          * @param array $expiry Per restriction type expiration
2567          * @param int $cascade Set to false if cascading protection isn't allowed.
2568          * @param string $reason
2569          * @param User|null $user
2570          * @return Revision|null Null on error
2571          */
2572         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2573                 array $expiry, $cascade, $reason, $user = null
2574         ) {
2575                 global $wgContLang;
2576                 $dbw = wfGetDB( DB_MASTER );
2577
2578                 // Prepare a null revision to be added to the history
2579                 $editComment = $wgContLang->ucfirst(
2580                         wfMessage(
2581                                 $revCommentMsg,
2582                                 $this->mTitle->getPrefixedText()
2583                         )->inContentLanguage()->text()
2584                 );
2585                 if ( $reason ) {
2586                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2587                 }
2588                 $protectDescription = $this->protectDescription( $limit, $expiry );
2589                 if ( $protectDescription ) {
2590                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2591                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2592                                 ->inContentLanguage()->text();
2593                 }
2594                 if ( $cascade ) {
2595                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2596                         $editComment .= wfMessage( 'brackets' )->params(
2597                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2598                         )->inContentLanguage()->text();
2599                 }
2600
2601                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2602                 if ( $nullRev ) {
2603                         $nullRev->insertOn( $dbw );
2604
2605                         // Update page record and touch page
2606                         $oldLatest = $nullRev->getParentId();
2607                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2608                 }
2609
2610                 return $nullRev;
2611         }
2612
2613         /**
2614          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2615          * @return string
2616          */
2617         protected function formatExpiry( $expiry ) {
2618                 global $wgContLang;
2619
2620                 if ( $expiry != 'infinity' ) {
2621                         return wfMessage(
2622                                 'protect-expiring',
2623                                 $wgContLang->timeanddate( $expiry, false, false ),
2624                                 $wgContLang->date( $expiry, false, false ),
2625                                 $wgContLang->time( $expiry, false, false )
2626                         )->inContentLanguage()->text();
2627                 } else {
2628                         return wfMessage( 'protect-expiry-indefinite' )
2629                                 ->inContentLanguage()->text();
2630                 }
2631         }
2632
2633         /**
2634          * Builds the description to serve as comment for the edit.
2635          *
2636          * @param array $limit Set of restriction keys
2637          * @param array $expiry Per restriction type expiration
2638          * @return string
2639          */
2640         public function protectDescription( array $limit, array $expiry ) {
2641                 $protectDescription = '';
2642
2643                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2644                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2645                         # All possible message keys are listed here for easier grepping:
2646                         # * restriction-create
2647                         # * restriction-edit
2648                         # * restriction-move
2649                         # * restriction-upload
2650                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2651                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2652                         # with '' filtered out. All possible message keys are listed below:
2653                         # * protect-level-autoconfirmed
2654                         # * protect-level-sysop
2655                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2656
2657                         $expiryText = $this->formatExpiry( $expiry[$action] );
2658
2659                         if ( $protectDescription !== '' ) {
2660                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2661                         }
2662                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2663                                 ->params( $actionText, $restrictionsText, $expiryText )
2664                                 ->inContentLanguage()->text();
2665                 }
2666
2667                 return $protectDescription;
2668         }
2669
2670         /**
2671          * Builds the description to serve as comment for the log entry.
2672          *
2673          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2674          * protect description text. Keep them in old format to avoid breaking compatibility.
2675          * TODO: Fix protection log to store structured description and format it on-the-fly.
2676          *
2677          * @param array $limit Set of restriction keys
2678          * @param array $expiry Per restriction type expiration
2679          * @return string
2680          */
2681         public function protectDescriptionLog( array $limit, array $expiry ) {
2682                 global $wgContLang;
2683
2684                 $protectDescriptionLog = '';
2685
2686                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2687                         $expiryText = $this->formatExpiry( $expiry[$action] );
2688                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2689                 }
2690
2691                 return trim( $protectDescriptionLog );
2692         }
2693
2694         /**
2695          * Take an array of page restrictions and flatten it to a string
2696          * suitable for insertion into the page_restrictions field.
2697          *
2698          * @param string[] $limit
2699          *
2700          * @throws MWException
2701          * @return string
2702          */
2703         protected static function flattenRestrictions( $limit ) {
2704                 if ( !is_array( $limit ) ) {
2705                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2706                 }
2707
2708                 $bits = array();
2709                 ksort( $limit );
2710
2711                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2712                         $bits[] = "$action=$restrictions";
2713                 }
2714
2715                 return implode( ':', $bits );
2716         }
2717
2718         /**
2719          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2720          * backwards compatibility, if you care about error reporting you should use
2721          * doDeleteArticleReal() instead.
2722          *
2723          * Deletes the article with database consistency, writes logs, purges caches
2724          *
2725          * @param string $reason Delete reason for deletion log
2726          * @param bool $suppress Suppress all revisions and log the deletion in
2727          *        the suppression log instead of the deletion log
2728          * @param int $id Article ID
2729          * @param bool $commit Defaults to true, triggers transaction end
2730          * @param array &$error Array of errors to append to
2731          * @param User $user The deleting user
2732          * @return bool True if successful
2733          */
2734         public function doDeleteArticle(
2735                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2736         ) {
2737                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2738                 return $status->isGood();
2739         }
2740
2741         /**
2742          * Back-end article deletion
2743          * Deletes the article with database consistency, writes logs, purges caches
2744          *
2745          * @since 1.19
2746          *
2747          * @param string $reason Delete reason for deletion log
2748          * @param bool $suppress Suppress all revisions and log the deletion in
2749          *   the suppression log instead of the deletion log
2750          * @param int $id Article ID
2751          * @param bool $commit Defaults to true, triggers transaction end
2752          * @param array &$error Array of errors to append to
2753          * @param User $user The deleting user
2754          * @return Status Status object; if successful, $status->value is the log_id of the
2755          *   deletion log entry. If the page couldn't be deleted because it wasn't
2756          *   found, $status is a non-fatal 'cannotdelete' error
2757          */
2758         public function doDeleteArticleReal(
2759                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2760         ) {
2761                 global $wgUser, $wgContentHandlerUseDB;
2762
2763                 wfDebug( __METHOD__ . "\n" );
2764
2765                 $status = Status::newGood();
2766
2767                 if ( $this->mTitle->getDBkey() === '' ) {
2768                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2769                         return $status;
2770                 }
2771
2772                 $user = is_null( $user ) ? $wgUser : $user;
2773                 if ( !Hooks::run( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2774                         if ( $status->isOK() ) {
2775                                 // Hook aborted but didn't set a fatal status
2776                                 $status->fatal( 'delete-hook-aborted' );
2777                         }
2778                         return $status;
2779                 }
2780
2781                 $dbw = wfGetDB( DB_MASTER );
2782                 $dbw->begin( __METHOD__ );
2783
2784                 if ( $id == 0 ) {
2785                         // T98706: lock the page from various other updates but avoid using
2786                         // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2787                         // the revisions queries (which also JOIN on user). Only lock the page
2788                         // row and CAS check on page_latest to see if the trx snapshot matches.
2789                         $latest = $this->lock();
2790
2791                         $this->loadPageData( WikiPage::READ_LATEST );
2792                         $id = $this->getID();
2793                         if ( $id == 0 || $this->getLatest() != $latest ) {
2794                                 // Page not there or trx snapshot is stale
2795                                 $dbw->rollback( __METHOD__ );
2796                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2797                                 return $status;
2798                         }
2799                 }
2800
2801                 // we need to remember the old content so we can use it to generate all deletion updates.
2802                 $content = $this->getContent( Revision::RAW );
2803
2804                 // Bitfields to further suppress the content
2805                 if ( $suppress ) {
2806                         $bitfield = 0;
2807                         // This should be 15...
2808                         $bitfield |= Revision::DELETED_TEXT;
2809                         $bitfield |= Revision::DELETED_COMMENT;
2810                         $bitfield |= Revision::DELETED_USER;
2811                         $bitfield |= Revision::DELETED_RESTRICTED;
2812                 } else {
2813                         $bitfield = 'rev_deleted';
2814                 }
2815
2816                 /**
2817                  * For now, shunt the revision data into the archive table.
2818                  * Text is *not* removed from the text table; bulk storage
2819                  * is left intact to avoid breaking block-compression or
2820                  * immutable storage schemes.
2821                  *
2822                  * For backwards compatibility, note that some older archive
2823                  * table entries will have ar_text and ar_flags fields still.
2824                  *
2825                  * In the future, we may keep revisions and mark them with
2826                  * the rev_deleted field, which is reserved for this purpose.
2827                  */
2828
2829                 $row = array(
2830                         'ar_namespace'  => 'page_namespace',
2831                         'ar_title'      => 'page_title',
2832                         'ar_comment'    => 'rev_comment',
2833                         'ar_user'       => 'rev_user',
2834                         'ar_user_text'  => 'rev_user_text',
2835                         'ar_timestamp'  => 'rev_timestamp',
2836                         'ar_minor_edit' => 'rev_minor_edit',
2837                         'ar_rev_id'     => 'rev_id',
2838                         'ar_parent_id'  => 'rev_parent_id',
2839                         'ar_text_id'    => 'rev_text_id',
2840                         'ar_text'       => '\'\'', // Be explicit to appease
2841                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2842                         'ar_len'        => 'rev_len',
2843                         'ar_page_id'    => 'page_id',
2844                         'ar_deleted'    => $bitfield,
2845                         'ar_sha1'       => 'rev_sha1',
2846                 );
2847
2848                 if ( $wgContentHandlerUseDB ) {
2849                         $row['ar_content_model'] = 'rev_content_model';
2850                         $row['ar_content_format'] = 'rev_content_format';
2851                 }
2852
2853                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2854                         $row,
2855                         array(
2856                                 'page_id' => $id,
2857                                 'page_id = rev_page'
2858                         ), __METHOD__
2859                 );
2860
2861                 // Now that it's safely backed up, delete it
2862                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2863                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2864
2865                 if ( !$ok ) {
2866                         $dbw->rollback( __METHOD__ );
2867                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2868                         return $status;
2869                 }
2870
2871                 if ( !$dbw->cascadingDeletes() ) {
2872                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2873                 }
2874
2875                 // Clone the title, so we have the information we need when we log
2876                 $logTitle = clone $this->mTitle;
2877
2878                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2879                 $logtype = $suppress ? 'suppress' : 'delete';
2880
2881                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2882                 $logEntry->setPerformer( $user );
2883                 $logEntry->setTarget( $logTitle );
2884                 $logEntry->setComment( $reason );
2885                 $logid = $logEntry->insert();
2886
2887                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
2888                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2889                         $logEntry->publish( $logid );
2890                 } );
2891
2892                 if ( $commit ) {
2893                         $dbw->commit( __METHOD__ );
2894                 }
2895
2896                 // Show log excerpt on 404 pages rather than just a link
2897                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2898                 ObjectCache::getMainStashInstance()->set( $key, 1, 86400 );
2899
2900                 $this->doDeleteUpdates( $id, $content );
2901
2902                 Hooks::run( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2903                 $status->value = $logid;
2904                 return $status;
2905         }
2906
2907         /**
2908          * Lock the page row for this title and return page_latest (or 0)
2909          *
2910          * @return integer
2911          */
2912         protected function lock() {
2913                 return (int)wfGetDB( DB_MASTER )->selectField(
2914                         'page',
2915                         'page_latest',
2916                         array(
2917                                 'page_namespace' => $this->getTitle()->getNamespace(),
2918                                 'page_title' => $this->getTitle()->getDBkey()
2919                         ),
2920                         __METHOD__,
2921                         array( 'FOR UPDATE' )
2922                 );
2923         }
2924
2925         /**
2926          * Do some database updates after deletion
2927          *
2928          * @param int $id The page_id value of the page being deleted
2929          * @param Content $content Optional page content to be used when determining
2930          *   the required updates. This may be needed because $this->getContent()
2931          *   may already return null when the page proper was deleted.
2932          */
2933         public function doDeleteUpdates( $id, Content $content = null ) {
2934                 // update site status
2935                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2936
2937                 // remove secondary indexes, etc
2938                 $updates = $this->getDeletionUpdates( $content );
2939                 DataUpdate::runUpdates( $updates, 'enqueue' );
2940
2941                 // Reparse any pages transcluding this page
2942                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2943
2944                 // Reparse any pages including this image
2945                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2946                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2947                 }
2948
2949                 // Clear caches
2950                 WikiPage::onArticleDelete( $this->mTitle );
2951
2952                 // Reset this object and the Title object
2953                 $this->loadFromRow( false, self::READ_LATEST );
2954
2955                 // Search engine
2956                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2957         }
2958
2959         /**
2960          * Roll back the most recent consecutive set of edits to a page
2961          * from the same user; fails if there are no eligible edits to
2962          * roll back to, e.g. user is the sole contributor. This function
2963          * performs permissions checks on $user, then calls commitRollback()
2964          * to do the dirty work
2965          *
2966          * @todo Separate the business/permission stuff out from backend code
2967          *
2968          * @param string $fromP Name of the user whose edits to rollback.
2969          * @param string $summary Custom summary. Set to default summary if empty.
2970          * @param string $token Rollback token.
2971          * @param bool $bot If true, mark all reverted edits as bot.
2972          *
2973          * @param array $resultDetails Array contains result-specific array of additional values
2974          *    'alreadyrolled' : 'current' (rev)
2975          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2976          *
2977          * @param User $user The user performing the rollback
2978          * @return array Array of errors, each error formatted as
2979          *   array(messagekey, param1, param2, ...).
2980          * On success, the array is empty.  This array can also be passed to
2981          * OutputPage::showPermissionsErrorPage().
2982          */
2983         public function doRollback(
2984                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2985         ) {
2986                 $resultDetails = null;
2987
2988                 // Check permissions
2989                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2990                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2991                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2992
2993                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2994                         $errors[] = array( 'sessionfailure' );
2995                 }
2996
2997                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2998                         $errors[] = array( 'actionthrottledtext' );
2999                 }
3000
3001                 // If there were errors, bail out now
3002                 if ( !empty( $errors ) ) {
3003                         return $errors;
3004                 }
3005
3006                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
3007         }
3008
3009         /**
3010          * Backend implementation of doRollback(), please refer there for parameter
3011          * and return value documentation
3012          *
3013          * NOTE: This function does NOT check ANY permissions, it just commits the
3014          * rollback to the DB. Therefore, you should only call this function direct-
3015          * ly if you want to use custom permissions checks. If you don't, use
3016          * doRollback() instead.
3017          * @param string $fromP Name of the user whose edits to rollback.
3018          * @param string $summary Custom summary. Set to default summary if empty.
3019          * @param bool $bot If true, mark all reverted edits as bot.
3020          *
3021          * @param array $resultDetails Contains result-specific array of additional values
3022          * @param User $guser The user performing the rollback
3023          * @return array
3024          */
3025         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
3026                 global $wgUseRCPatrol, $wgContLang;
3027
3028                 $dbw = wfGetDB( DB_MASTER );
3029
3030                 if ( wfReadOnly() ) {
3031                         return array( array( 'readonlytext' ) );
3032                 }
3033
3034                 // Get the last editor
3035                 $current = $this->getRevision();
3036                 if ( is_null( $current ) ) {
3037                         // Something wrong... no page?
3038                         return array( array( 'notanarticle' ) );
3039                 }
3040
3041                 $from = str_replace( '_', ' ', $fromP );
3042                 // User name given should match up with the top revision.
3043                 // If the user was deleted then $from should be empty.
3044                 if ( $from != $current->getUserText() ) {
3045                         $resultDetails = array( 'current' => $current );
3046                         return array( array( 'alreadyrolled',
3047                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3048                                 htmlspecialchars( $fromP ),
3049                                 htmlspecialchars( $current->getUserText() )
3050                         ) );
3051                 }
3052
3053                 // Get the last edit not by this person...
3054                 // Note: these may not be public values
3055                 $user = intval( $current->getUser( Revision::RAW ) );
3056                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3057                 $s = $dbw->selectRow( 'revision',
3058                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3059                         array( 'rev_page' => $current->getPage(),
3060                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3061                         ), __METHOD__,
3062                         array( 'USE INDEX' => 'page_timestamp',
3063                                 'ORDER BY' => 'rev_timestamp DESC' )
3064                         );
3065                 if ( $s === false ) {
3066                         // No one else ever edited this page
3067                         return array( array( 'cantrollback' ) );
3068                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3069                         || $s->rev_deleted & Revision::DELETED_USER
3070                 ) {
3071                         // Only admins can see this text
3072                         return array( array( 'notvisiblerev' ) );
3073                 }
3074
3075                 // Generate the edit summary if necessary
3076                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3077                 if ( empty( $summary ) ) {
3078                         if ( $from == '' ) { // no public user name
3079                                 $summary = wfMessage( 'revertpage-nouser' );
3080                         } else {
3081                                 $summary = wfMessage( 'revertpage' );
3082                         }
3083                 }
3084
3085                 // Allow the custom summary to use the same args as the default message
3086                 $args = array(
3087                         $target->getUserText(), $from, $s->rev_id,
3088                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3089                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3090                 );
3091                 if ( $summary instanceof Message ) {
3092                         $summary = $summary->params( $args )->inContentLanguage()->text();
3093                 } else {
3094                         $summary = wfMsgReplaceArgs( $summary, $args );
3095                 }
3096
3097                 // Trim spaces on user supplied text
3098                 $summary = trim( $summary );
3099
3100                 // Truncate for whole multibyte characters.
3101                 $summary = $wgContLang->truncate( $summary, 255 );
3102
3103                 // Save
3104                 $flags = EDIT_UPDATE;
3105
3106                 if ( $guser->isAllowed( 'minoredit' ) ) {
3107                         $flags |= EDIT_MINOR;
3108                 }
3109
3110                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3111                         $flags |= EDIT_FORCE_BOT;
3112                 }
3113
3114                 // Actually store the edit
3115                 $status = $this->doEditContent(
3116                         $target->getContent(),
3117                         $summary,
3118                         $flags,
3119                         $target->getId(),
3120                         $guser
3121                 );
3122
3123                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3124                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3125                 $set = array();
3126                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3127                         // Mark all reverted edits as bot
3128                         $set['rc_bot'] = 1;
3129                 }
3130
3131                 if ( $wgUseRCPatrol ) {
3132                         // Mark all reverted edits as patrolled
3133                         $set['rc_patrolled'] = 1;
3134                 }
3135
3136                 if ( count( $set ) ) {
3137                         $dbw->update( 'recentchanges', $set,
3138                                 array( /* WHERE */
3139                                         'rc_cur_id' => $current->getPage(),
3140                                         'rc_user_text' => $current->getUserText(),
3141                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3142                                 ),
3143                                 __METHOD__
3144                         );
3145                 }
3146
3147                 if ( !$status->isOK() ) {
3148                         return $status->getErrorsArray();
3149                 }
3150
3151                 // raise error, when the edit is an edit without a new version
3152                 if ( empty( $status->value['revision'] ) ) {
3153                         $resultDetails = array( 'current' => $current );
3154                         return array( array( 'alreadyrolled',
3155                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3156                                         htmlspecialchars( $fromP ),
3157                                         htmlspecialchars( $current->getUserText() )
3158                         ) );
3159                 }
3160
3161                 $revId = $status->value['revision']->getId();
3162
3163                 Hooks::run( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
3164
3165                 $resultDetails = array(
3166                         'summary' => $summary,
3167                         'current' => $current,
3168                         'target' => $target,
3169                         'newid' => $revId
3170                 );
3171
3172                 return array();
3173         }
3174
3175         /**
3176          * The onArticle*() functions are supposed to be a kind of hooks
3177          * which should be called whenever any of the specified actions
3178          * are done.
3179          *
3180          * This is a good place to put code to clear caches, for instance.
3181          *
3182          * This is called on page move and undelete, as well as edit
3183          *
3184          * @param Title $title
3185          */
3186         public static function onArticleCreate( Title $title ) {
3187                 // Update existence markers on article/talk tabs...
3188                 $other = $title->getOtherPage();
3189
3190                 $other->purgeSquid();
3191
3192                 $title->touchLinks();
3193                 $title->purgeSquid();
3194                 $title->deleteTitleProtection();
3195         }
3196
3197         /**
3198          * Clears caches when article is deleted
3199          *
3200          * @param Title $title
3201          */
3202         public static function onArticleDelete( Title $title ) {
3203                 // Update existence markers on article/talk tabs...
3204                 $other = $title->getOtherPage();
3205
3206                 $other->purgeSquid();
3207
3208                 $title->touchLinks();
3209                 $title->purgeSquid();
3210
3211                 // File cache
3212                 HTMLFileCache::clearFileCache( $title );
3213                 InfoAction::invalidateCache( $title );
3214
3215                 // Messages
3216                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3217                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3218                 }
3219
3220                 // Images
3221                 if ( $title->getNamespace() == NS_FILE ) {
3222                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3223                         $update->doUpdate();
3224                 }
3225
3226                 // User talk pages
3227                 if ( $title->getNamespace() == NS_USER_TALK ) {
3228                         $user = User::newFromName( $title->getText(), false );
3229                         if ( $user ) {
3230                                 $user->setNewtalk( false );
3231                         }
3232                 }
3233
3234                 // Image redirects
3235                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3236         }
3237
3238         /**
3239          * Purge caches on page update etc
3240          *
3241          * @param Title $title
3242          * @param Revision|null $revision Revision that was just saved, may be null
3243          */
3244         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3245                 // Invalidate caches of articles which include this page
3246                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3247
3248                 // Invalidate the caches of all pages which redirect here
3249                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3250
3251                 // Purge squid for this page only
3252                 $title->purgeSquid();
3253                 // Clear file cache for this page only
3254                 HTMLFileCache::clearFileCache( $title );
3255
3256                 $revid = $revision ? $revision->getId() : null;
3257                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3258                         InfoAction::invalidateCache( $title, $revid );
3259                 } );
3260         }
3261
3262         /**#@-*/
3263
3264         /**
3265          * Returns a list of categories this page is a member of.
3266          * Results will include hidden categories
3267          *
3268          * @return TitleArray
3269          */
3270         public function getCategories() {
3271                 $id = $this->getId();
3272                 if ( $id == 0 ) {
3273                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3274                 }
3275
3276                 $dbr = wfGetDB( DB_SLAVE );
3277                 $res = $dbr->select( 'categorylinks',
3278                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3279                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3280                         // as not being aliases, and NS_CATEGORY is numeric
3281                         array( 'cl_from' => $id ),
3282                         __METHOD__ );
3283
3284                 return TitleArray::newFromResult( $res );
3285         }
3286
3287         /**
3288          * Returns a list of hidden categories this page is a member of.
3289          * Uses the page_props and categorylinks tables.
3290          *
3291          * @return array Array of Title objects
3292          */
3293         public function getHiddenCategories() {
3294                 $result = array();
3295                 $id = $this->getId();
3296
3297                 if ( $id == 0 ) {
3298                         return array();
3299                 }
3300
3301                 $dbr = wfGetDB( DB_SLAVE );
3302                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3303                         array( 'cl_to' ),
3304                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3305                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3306                         __METHOD__ );
3307
3308                 if ( $res !== false ) {
3309                         foreach ( $res as $row ) {
3310                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3311                         }
3312                 }
3313
3314                 return $result;
3315         }
3316
3317         /**
3318          * Return an applicable autosummary if one exists for the given edit.
3319          * @param string|null $oldtext The previous text of the page.
3320          * @param string|null $newtext The submitted text of the page.
3321          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3322          * @return string An appropriate autosummary, or an empty string.
3323          *
3324          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3325          */
3326         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3327                 // NOTE: stub for backwards-compatibility. assumes the given text is
3328                 // wikitext. will break horribly if it isn't.
3329
3330                 ContentHandler::deprecated( __METHOD__, '1.21' );
3331
3332                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3333                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3334                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3335
3336                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3337         }
3338
3339         /**
3340          * Auto-generates a deletion reason
3341          *
3342          * @param bool &$hasHistory Whether the page has a history
3343          * @return string|bool String containing deletion reason or empty string, or boolean false
3344          *    if no revision occurred
3345          */
3346         public function getAutoDeleteReason( &$hasHistory ) {
3347                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3348         }
3349
3350         /**
3351          * Update all the appropriate counts in the category table, given that
3352          * we've added the categories $added and deleted the categories $deleted.
3353          *
3354          * @param array $added The names of categories that were added
3355          * @param array $deleted The names of categories that were deleted
3356          */
3357         public function updateCategoryCounts( array $added, array $deleted ) {
3358                 $that = $this;
3359                 $method = __METHOD__;
3360                 $dbw = wfGetDB( DB_MASTER );
3361
3362                 // Do this at the end of the commit to reduce lock wait timeouts
3363                 $dbw->onTransactionPreCommitOrIdle(
3364                         function () use ( $dbw, $that, $method, $added, $deleted ) {
3365                                 $ns = $that->getTitle()->getNamespace();
3366
3367                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3368                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3369                                 if ( $ns == NS_CATEGORY ) {
3370                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3371                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3372                                 } elseif ( $ns == NS_FILE ) {
3373                                         $addFields[] = 'cat_files = cat_files + 1';
3374                                         $removeFields[] = 'cat_files = cat_files - 1';
3375                                 }
3376
3377                                 if ( count( $added ) ) {
3378                                         $insertRows = array();
3379                                         foreach ( $added as $cat ) {
3380                                                 $insertRows[] = array(
3381                                                         'cat_title'   => $cat,
3382                                                         'cat_pages'   => 1,
3383                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3384                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3385                                                 );
3386                                         }
3387                                         $dbw->upsert(
3388                                                 'category',
3389                                                 $insertRows,
3390                                                 array( 'cat_title' ),
3391                                                 $addFields,
3392                                                 $method
3393                                         );
3394                                 }
3395
3396                                 if ( count( $deleted ) ) {
3397                                         $dbw->update(
3398                                                 'category',
3399                                                 $removeFields,
3400                                                 array( 'cat_title' => $deleted ),
3401                                                 $method
3402                                         );
3403                                 }
3404
3405                                 foreach ( $added as $catName ) {
3406                                         $cat = Category::newFromName( $catName );
3407                                         Hooks::run( 'CategoryAfterPageAdded', array( $cat, $that ) );
3408                                 }
3409
3410                                 foreach ( $deleted as $catName ) {
3411                                         $cat = Category::newFromName( $catName );
3412                                         Hooks::run( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3413                                 }
3414                         }
3415                 );
3416         }
3417
3418         /**
3419          * Opportunistically enqueue link update jobs given fresh parser output if useful
3420          *
3421          * @param ParserOutput $parserOutput Current version page output
3422          * @since 1.25
3423          */
3424         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3425                 if ( wfReadOnly() ) {
3426                         return;
3427                 }
3428
3429                 if ( !Hooks::run( 'OpportunisticLinksUpdate', array( $this, $this->mTitle, $parserOutput ) ) ) {
3430                         return;
3431                 }
3432
3433                 if ( $this->mTitle->areRestrictionsCascading() ) {
3434                         // If the page is cascade protecting, the links should really be up-to-date
3435                         $params = array( 'prioritize' => true );
3436                 } elseif ( $parserOutput->hasDynamicContent() ) {
3437                         // Assume the output contains time/random based magic words
3438                         $params = array();
3439                 } else {
3440                         // If the inclusions are deterministic, the edit-triggered link jobs are enough
3441                         return;
3442                 }
3443
3444                 // Check if the last link refresh was before page_touched
3445                 if ( $this->getLinksTimestamp() < $this->getTouched() ) {
3446                         $params['isOpportunistic'] = true;
3447                         $params['rootJobTimestamp'] = $parserOutput->getCacheTime();
3448
3449                         JobQueueGroup::singleton()->lazyPush( EnqueueJob::newFromLocalJobs(
3450                                 new JobSpecification( 'refreshLinks', $params,
3451                                         array( 'removeDuplicates' => true ), $this->mTitle )
3452                         ) );
3453                 }
3454         }
3455
3456         /**
3457          * Return a list of templates used by this article.
3458          * Uses the templatelinks table
3459          *
3460          * @deprecated since 1.19; use Title::getTemplateLinksFrom()
3461          * @return array Array of Title objects
3462          */
3463         public function getUsedTemplates() {
3464                 return $this->mTitle->getTemplateLinksFrom();
3465         }
3466
3467         /**
3468          * This function is called right before saving the wikitext,
3469          * so we can do things like signatures and links-in-context.
3470          *
3471          * @deprecated since 1.19; use Parser::preSaveTransform() instead
3472          * @param string $text Article contents
3473          * @param User $user User doing the edit
3474          * @param ParserOptions $popts Parser options, default options for
3475          *   the user loaded if null given
3476          * @return string Article contents with altered wikitext markup (signatures
3477          *      converted, {{subst:}}, templates, etc.)
3478          */
3479         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3480                 global $wgParser, $wgUser;
3481
3482                 wfDeprecated( __METHOD__, '1.19' );
3483
3484                 $user = is_null( $user ) ? $wgUser : $user;
3485
3486                 if ( $popts === null ) {
3487                         $popts = ParserOptions::newFromUser( $user );
3488                 }
3489
3490                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3491         }
3492
3493         /**
3494          * Update the article's restriction field, and leave a log entry.
3495          *
3496          * @deprecated since 1.19
3497          * @param array $limit Set of restriction keys
3498          * @param string $reason
3499          * @param int &$cascade Set to false if cascading protection isn't allowed.
3500          * @param array $expiry Per restriction type expiration
3501          * @param User $user The user updating the restrictions
3502          * @return bool True on success
3503          */
3504         public function updateRestrictions(
3505                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3506         ) {
3507                 global $wgUser;
3508
3509                 $user = is_null( $user ) ? $wgUser : $user;
3510
3511                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3512         }
3513
3514         /**
3515          * Returns a list of updates to be performed when this page is deleted. The
3516          * updates should remove any information about this page from secondary data
3517          * stores such as links tables.
3518          *
3519          * @param Content|null $content Optional Content object for determining the
3520          *   necessary updates.
3521          * @return array An array of DataUpdates objects
3522          */
3523         public function getDeletionUpdates( Content $content = null ) {
3524                 if ( !$content ) {
3525                         // load content object, which may be used to determine the necessary updates
3526                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3527                         $content = $this->getContent( Revision::RAW );
3528                 }
3529
3530                 if ( !$content ) {
3531                         $updates = array();
3532                 } else {
3533                         $updates = $content->getDeletionUpdates( $this );
3534                 }
3535
3536                 Hooks::run( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3537                 return $updates;
3538         }
3539 }