includes/WikiPage.php

   1 <?php
   2 /**
   3  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
   4  */
   5 abstract class Page {}
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * Some fields are public only for backwards-compatibility. Use accessors.
  11  * In the past, this class was part of Article.php and everything was public.
  12  *
  13  * @internal documentation reviewed 15 Mar 2010
  14  */
  15 class WikiPage extends Page {
  16         // doDeleteArticleReal() return values. Values less than zero indicate fatal errors,
  17         // values greater than zero indicate that there were problems not resulting in page
  18         // not being deleted
  19
  20         /**
  21          * Delete operation aborted by hook
  22          */
  23         const DELETE_HOOK_ABORTED = -1;
  24
  25         /**
  26          * Deletion successful
  27          */
  28         const DELETE_SUCCESS = 0;
  29
  30         /**
  31          * Page not found
  32          */
  33         const DELETE_NO_PAGE = 1;
  34
  35         /**
  36          * No revisions found to delete
  37          */
  38         const DELETE_NO_REVISIONS = 2;
  39
  40         /**
  41          * @var Title
  42          */
  43         public $mTitle = null;
  44
  45         /**@{{
  46          * @protected
  47          */
  48         public $mDataLoaded = false;         // !< Boolean
  49         public $mIsRedirect = false;         // !< Boolean
  50         public $mLatest = false;             // !< Integer (false means "not loaded")
  51         public $mPreparedEdit = false;       // !< Array
  52         /**@}}*/
  53
  54         /**
  55          * @var Title
  56          */
  57         protected $mRedirectTarget = null;
  58
  59         /**
  60          * @var Revision
  61          */
  62         protected $mLastRevision = null;
  63
  64         /**
  65          * @var string; timestamp of the current revision or empty string if not loaded
  66          */
  67         protected $mTimestamp = '';
  68
  69         /**
  70          * @var string
  71          */
  72         protected $mTouched = '19700101000000';
  73
  74         /**
  75          * @var int|null
  76          */
  77         protected $mCounter = null;
  78
  79         /**
  80          * Constructor and clear the article
  81          * @param $title Title Reference to a Title object.
  82          */
  83         public function __construct( Title $title ) {
  84                 $this->mTitle = $title;
  85         }
  86
  87         /**
  88          * Create a WikiPage object of the appropriate class for the given title.
  89          *
  90          * @param $title Title
  91          * @return WikiPage object of the appropriate type
  92          */
  93         public static function factory( Title $title ) {
  94                 $ns = $title->getNamespace();
  95
  96                 if ( $ns == NS_MEDIA ) {
  97                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  98                 } elseif ( $ns < 0 ) {
  99                         throw new MWException( "Invalid or virtual namespace $ns given." );
 100                 }
 101
 102                 switch ( $ns ) {
 103                         case NS_FILE:
 104                                 $page = new WikiFilePage( $title );
 105                                 break;
 106                         case NS_CATEGORY:
 107                                 $page = new WikiCategoryPage( $title );
 108                                 break;
 109                         default:
 110                                 $page = new WikiPage( $title );
 111                 }
 112
 113                 return $page;
 114         }
 115
 116         /**
 117          * Constructor from a page id
 118          *
 119          * @param $id Int article ID to load
 120          *
 121          * @return WikiPage|null
 122          */
 123         public static function newFromID( $id ) {
 124                 $t = Title::newFromID( $id );
 125                 if ( $t ) {
 126                         return self::factory( $t );
 127                 }
 128                 return null;
 129         }
 130
 131         /**
 132          * Returns overrides for action handlers.
 133          * Classes listed here will be used instead of the default one when
 134          * (and only when) $wgActions[$action] === true. This allows subclasses
 135          * to override the default behavior.
 136          *
 137          * @todo: move this UI stuff somewhere else
 138          *
 139          * @return Array
 140          */
 141         public function getActionOverrides() {
 142                 return array();
 143         }
 144
 145         /**
 146          * Get the title object of the article
 147          * @return Title object of this page
 148          */
 149         public function getTitle() {
 150                 return $this->mTitle;
 151         }
 152
 153         /**
 154          * Clear the object
 155          */
 156         public function clear() {
 157                 $this->mDataLoaded = false;
 158
 159                 $this->mCounter = null;
 160                 $this->mRedirectTarget = null; # Title object if set
 161                 $this->mLastRevision = null; # Latest revision
 162                 $this->mTouched = '19700101000000';
 163                 $this->mTimestamp = '';
 164                 $this->mIsRedirect = false;
 165                 $this->mLatest = false;
 166                 $this->mPreparedEdit = false;
 167         }
 168
 169         /**
 170          * Return the list of revision fields that should be selected to create
 171          * a new page.
 172          *
 173          * @return array
 174          */
 175         public static function selectFields() {
 176                 return array(
 177                         'page_id',
 178                         'page_namespace',
 179                         'page_title',
 180                         'page_restrictions',
 181                         'page_counter',
 182                         'page_is_redirect',
 183                         'page_is_new',
 184                         'page_random',
 185                         'page_touched',
 186                         'page_latest',
 187                         'page_len',
 188                 );
 189         }
 190
 191         /**
 192          * Fetch a page record with the given conditions
 193          * @param $dbr DatabaseBase object
 194          * @param $conditions Array
 195          * @return mixed Database result resource, or false on failure
 196          */
 197         protected function pageData( $dbr, $conditions ) {
 198                 $fields = self::selectFields();
 199
 200                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 201
 202                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 203
 204                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 205
 206                 return $row;
 207         }
 208
 209         /**
 210          * Fetch a page record matching the Title object's namespace and title
 211          * using a sanitized title string
 212          *
 213          * @param $dbr DatabaseBase object
 214          * @param $title Title object
 215          * @return mixed Database result resource, or false on failure
 216          */
 217         public function pageDataFromTitle( $dbr, $title ) {
 218                 return $this->pageData( $dbr, array(
 219                         'page_namespace' => $title->getNamespace(),
 220                         'page_title'     => $title->getDBkey() ) );
 221         }
 222
 223         /**
 224          * Fetch a page record matching the requested ID
 225          *
 226          * @param $dbr DatabaseBase
 227          * @param $id Integer
 228          * @return mixed Database result resource, or false on failure
 229          */
 230         public function pageDataFromId( $dbr, $id ) {
 231                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 232         }
 233
 234         /**
 235          * Set the general counter, title etc data loaded from
 236          * some source.
 237          *
 238          * @param $data Object|String One of the following:
 239          *              A DB query result object or...
 240          *              "fromdb" to get from a slave DB or...
 241          *              "fromdbmaster" to get from the master DB
 242          * @return void
 243          */
 244         public function loadPageData( $data = 'fromdb' ) {
 245                 if ( $data === 'fromdbmaster' ) {
 246                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 247                 } elseif ( $data === 'fromdb' ) { // slave
 248                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 249                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 250                         # Note that DB also stores the master position in the session and checks it.
 251                         $touched = $this->getCachedLastEditTime();
 252                         if ( $touched ) { // key set
 253                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 254                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 255                                 }
 256                         }
 257                 }
 258
 259                 $lc = LinkCache::singleton();
 260
 261                 if ( $data ) {
 262                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 263
 264                         $this->mTitle->loadFromRow( $data );
 265
 266                         # Old-fashioned restrictions
 267                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 268
 269                         $this->mCounter     = intval( $data->page_counter );
 270                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 271                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 272                         $this->mLatest      = intval( $data->page_latest );
 273                 } else {
 274                         $lc->addBadLinkObj( $this->mTitle );
 275
 276                         $this->mTitle->loadFromRow( false );
 277                 }
 278
 279                 $this->mDataLoaded = true;
 280         }
 281
 282         /**
 283          * @return int Page ID
 284          */
 285         public function getId() {
 286                 return $this->mTitle->getArticleID();
 287         }
 288
 289         /**
 290          * @return bool Whether or not the page exists in the database
 291          */
 292         public function exists() {
 293                 return $this->mTitle->exists();
 294         }
 295
 296         /**
 297          * Check if this page is something we're going to be showing
 298          * some sort of sensible content for. If we return false, page
 299          * views (plain action=view) will return an HTTP 404 response,
 300          * so spiders and robots can know they're following a bad link.
 301          *
 302          * @return bool
 303          */
 304         public function hasViewableContent() {
 305                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 306         }
 307
 308         /**
 309          * @return int The view count for the page
 310          */
 311         public function getCount() {
 312                 if ( !$this->mDataLoaded ) {
 313                         $this->loadPageData();
 314                 }
 315
 316                 return $this->mCounter;
 317         }
 318
 319         /**
 320          * Tests if the article text represents a redirect
 321          *
 322          * @param $text mixed string containing article contents, or boolean
 323          * @return bool
 324          */
 325         public function isRedirect( $text = false ) {
 326                 if ( $text === false ) {
 327                         if ( !$this->mDataLoaded ) {
 328                                 $this->loadPageData();
 329                         }
 330
 331                         return (bool)$this->mIsRedirect;
 332                 } else {
 333                         return Title::newFromRedirect( $text ) !== null;
 334                 }
 335         }
 336
 337         /**
 338          * Loads page_touched and returns a value indicating if it should be used
 339          * @return boolean true if not a redirect
 340          */
 341         public function checkTouched() {
 342                 if ( !$this->mDataLoaded ) {
 343                         $this->loadPageData();
 344                 }
 345                 return !$this->mIsRedirect;
 346         }
 347
 348         /**
 349          * Get the page_touched field
 350          * @return string containing GMT timestamp
 351          */
 352         public function getTouched() {
 353                 if ( !$this->mDataLoaded ) {
 354                         $this->loadPageData();
 355                 }
 356                 return $this->mTouched;
 357         }
 358
 359         /**
 360          * Get the page_latest field
 361          * @return integer rev_id of current revision
 362          */
 363         public function getLatest() {
 364                 if ( !$this->mDataLoaded ) {
 365                         $this->loadPageData();
 366                 }
 367                 return (int)$this->mLatest;
 368         }
 369
 370         /**
 371          * Loads everything except the text
 372          * This isn't necessary for all uses, so it's only done if needed.
 373          */
 374         protected function loadLastEdit() {
 375                 if ( $this->mLastRevision !== null ) {
 376                         return; // already loaded
 377                 }
 378
 379                 $latest = $this->getLatest();
 380                 if ( !$latest ) {
 381                         return; // page doesn't exist or is missing page_latest info
 382                 }
 383
 384                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 385                 if ( $revision ) { // sanity
 386                         $this->setLastEdit( $revision );
 387                 }
 388         }
 389
 390         /**
 391          * Set the latest revision
 392          */
 393         protected function setLastEdit( Revision $revision ) {
 394                 $this->mLastRevision = $revision;
 395                 $this->mTimestamp = $revision->getTimestamp();
 396         }
 397
 398         /**
 399          * Get the latest revision
 400          * @return Revision|null
 401          */
 402         public function getRevision() {
 403                 $this->loadLastEdit();
 404                 if ( $this->mLastRevision ) {
 405                         return $this->mLastRevision;
 406                 }
 407                 return null;
 408         }
 409
 410         /**
 411          * Get the text of the current revision. No side-effects...
 412          *
 413          * @param $audience Integer: one of:
 414          *      Revision::FOR_PUBLIC       to be displayed to all users
 415          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 416          *      Revision::RAW              get the text regardless of permissions
 417          * @return String|bool The text of the current revision. False on failure
 418          */
 419         public function getText( $audience = Revision::FOR_PUBLIC ) {
 420                 $this->loadLastEdit();
 421                 if ( $this->mLastRevision ) {
 422                         return $this->mLastRevision->getText( $audience );
 423                 }
 424                 return false;
 425         }
 426
 427         /**
 428          * Get the text of the current revision. No side-effects...
 429          *
 430          * @return String|bool The text of the current revision. False on failure
 431          */
 432         public function getRawText() {
 433                 $this->loadLastEdit();
 434                 if ( $this->mLastRevision ) {
 435                         return $this->mLastRevision->getRawText();
 436                 }
 437                 return false;
 438         }
 439
 440         /**
 441          * @return string MW timestamp of last article revision
 442          */
 443         public function getTimestamp() {
 444                 // Check if the field has been filled by WikiPage::setTimestamp()
 445                 if ( !$this->mTimestamp ) {
 446                         $this->loadLastEdit();
 447                 }
 448
 449                 return wfTimestamp( TS_MW, $this->mTimestamp );
 450         }
 451
 452         /**
 453          * Set the page timestamp (use only to avoid DB queries)
 454          * @param $ts string MW timestamp of last article revision
 455          * @return void
 456          */
 457         public function setTimestamp( $ts ) {
 458                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 459         }
 460
 461         /**
 462          * @param $audience Integer: one of:
 463          *      Revision::FOR_PUBLIC       to be displayed to all users
 464          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 465          *      Revision::RAW              get the text regardless of permissions
 466          * @return int user ID for the user that made the last article revision
 467          */
 468         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 469                 $this->loadLastEdit();
 470                 if ( $this->mLastRevision ) {
 471                         return $this->mLastRevision->getUser( $audience );
 472                 } else {
 473                         return -1;
 474                 }
 475         }
 476
 477         /**
 478          * @param $audience Integer: one of:
 479          *      Revision::FOR_PUBLIC       to be displayed to all users
 480          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 481          *      Revision::RAW              get the text regardless of permissions
 482          * @return string username of the user that made the last article revision
 483          */
 484         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 485                 $this->loadLastEdit();
 486                 if ( $this->mLastRevision ) {
 487                         return $this->mLastRevision->getUserText( $audience );
 488                 } else {
 489                         return '';
 490                 }
 491         }
 492
 493         /**
 494          * @param $audience Integer: one of:
 495          *      Revision::FOR_PUBLIC       to be displayed to all users
 496          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 497          *      Revision::RAW              get the text regardless of permissions
 498          * @return string Comment stored for the last article revision
 499          */
 500         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 501                 $this->loadLastEdit();
 502                 if ( $this->mLastRevision ) {
 503                         return $this->mLastRevision->getComment( $audience );
 504                 } else {
 505                         return '';
 506                 }
 507         }
 508
 509         /**
 510          * Returns true if last revision was marked as "minor edit"
 511          *
 512          * @return boolean Minor edit indicator for the last article revision.
 513          */
 514         public function getMinorEdit() {
 515                 $this->loadLastEdit();
 516                 if ( $this->mLastRevision ) {
 517                         return $this->mLastRevision->isMinor();
 518                 } else {
 519                         return false;
 520                 }
 521         }
 522
 523         /**
 524          * Get the cached timestamp for the last time the page changed.
 525          * This is only used to help handle slave lag by comparing to page_touched.
 526          * @return string MW timestamp
 527          */
 528         protected function getCachedLastEditTime() {
 529                 global $wgMemc;
 530                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 531                 return $wgMemc->get( $key );
 532         }
 533
 534         /**
 535          * Set the cached timestamp for the last time the page changed.
 536          * This is only used to help handle slave lag by comparing to page_touched.
 537          * @param $timestamp string
 538          * @return void
 539          */
 540         public function setCachedLastEditTime( $timestamp ) {
 541                 global $wgMemc;
 542                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 543                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 544         }
 545
 546         /**
 547          * Determine whether a page would be suitable for being counted as an
 548          * article in the site_stats table based on the title & its content
 549          *
 550          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 551          *        if false, the current database state will be used
 552          * @return Boolean
 553          */
 554         public function isCountable( $editInfo = false ) {
 555                 global $wgArticleCountMethod;
 556
 557                 if ( !$this->mTitle->isContentPage() ) {
 558                         return false;
 559                 }
 560
 561                 $text = $editInfo ? $editInfo->pst : false;
 562
 563                 if ( $this->isRedirect( $text ) ) {
 564                         return false;
 565                 }
 566
 567                 switch ( $wgArticleCountMethod ) {
 568                 case 'any':
 569                         return true;
 570                 case 'comma':
 571                         if ( $text === false ) {
 572                                 $text = $this->getRawText();
 573                         }
 574                         return strpos( $text,  ',' ) !== false;
 575                 case 'link':
 576                         if ( $editInfo ) {
 577                                 // ParserOutput::getLinks() is a 2D array of page links, so
 578                                 // to be really correct we would need to recurse in the array
 579                                 // but the main array should only have items in it if there are
 580                                 // links.
 581                                 return (bool)count( $editInfo->output->getLinks() );
 582                         } else {
 583                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 584                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 585                         }
 586                 }
 587         }
 588
 589         /**
 590          * If this page is a redirect, get its target
 591          *
 592          * The target will be fetched from the redirect table if possible.
 593          * If this page doesn't have an entry there, call insertRedirect()
 594          * @return Title|mixed object, or null if this page is not a redirect
 595          */
 596         public function getRedirectTarget() {
 597                 if ( !$this->mTitle->isRedirect() ) {
 598                         return null;
 599                 }
 600
 601                 if ( $this->mRedirectTarget !== null ) {
 602                         return $this->mRedirectTarget;
 603                 }
 604
 605                 # Query the redirect table
 606                 $dbr = wfGetDB( DB_SLAVE );
 607                 $row = $dbr->selectRow( 'redirect',
 608                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 609                         array( 'rd_from' => $this->getId() ),
 610                         __METHOD__
 611                 );
 612
 613                 // rd_fragment and rd_interwiki were added later, populate them if empty
 614                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 615                         return $this->mRedirectTarget = Title::makeTitle(
 616                                 $row->rd_namespace, $row->rd_title,
 617                                 $row->rd_fragment, $row->rd_interwiki );
 618                 }
 619
 620                 # This page doesn't have an entry in the redirect table
 621                 return $this->mRedirectTarget = $this->insertRedirect();
 622         }
 623
 624         /**
 625          * Insert an entry for this page into the redirect table.
 626          *
 627          * Don't call this function directly unless you know what you're doing.
 628          * @return Title object or null if not a redirect
 629          */
 630         public function insertRedirect() {
 631                 // recurse through to only get the final target
 632                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 633                 if ( !$retval ) {
 634                         return null;
 635                 }
 636                 $this->insertRedirectEntry( $retval );
 637                 return $retval;
 638         }
 639
 640         /**
 641          * Insert or update the redirect table entry for this page to indicate
 642          * it redirects to $rt .
 643          * @param $rt Title redirect target
 644          */
 645         public function insertRedirectEntry( $rt ) {
 646                 $dbw = wfGetDB( DB_MASTER );
 647                 $dbw->replace( 'redirect', array( 'rd_from' ),
 648                         array(
 649                                 'rd_from'      => $this->getId(),
 650                                 'rd_namespace' => $rt->getNamespace(),
 651                                 'rd_title'     => $rt->getDBkey(),
 652                                 'rd_fragment'  => $rt->getFragment(),
 653                                 'rd_interwiki' => $rt->getInterwiki(),
 654                         ),
 655                         __METHOD__
 656                 );
 657         }
 658
 659         /**
 660          * Get the Title object or URL this page redirects to
 661          *
 662          * @return mixed false, Title of in-wiki target, or string with URL
 663          */
 664         public function followRedirect() {
 665                 return $this->getRedirectURL( $this->getRedirectTarget() );
 666         }
 667
 668         /**
 669          * Get the Title object or URL to use for a redirect. We use Title
 670          * objects for same-wiki, non-special redirects and URLs for everything
 671          * else.
 672          * @param $rt Title Redirect target
 673          * @return mixed false, Title object of local target, or string with URL
 674          */
 675         public function getRedirectURL( $rt ) {
 676                 if ( !$rt ) {
 677                         return false;
 678                 }
 679
 680                 if ( $rt->isExternal() ) {
 681                         if ( $rt->isLocal() ) {
 682                                 // Offsite wikis need an HTTP redirect.
 683                                 //
 684                                 // This can be hard to reverse and may produce loops,
 685                                 // so they may be disabled in the site configuration.
 686                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 687                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 688                         } else {
 689                                 // External pages pages without "local" bit set are not valid
 690                                 // redirect targets
 691                                 return false;
 692                         }
 693                 }
 694
 695                 if ( $rt->isSpecialPage() ) {
 696                         // Gotta handle redirects to special pages differently:
 697                         // Fill the HTTP response "Location" header and ignore
 698                         // the rest of the page we're on.
 699                         //
 700                         // Some pages are not valid targets
 701                         if ( $rt->isValidRedirectTarget() ) {
 702                                 return $rt->getFullURL();
 703                         } else {
 704                                 return false;
 705                         }
 706                 }
 707
 708                 return $rt;
 709         }
 710
 711         /**
 712          * Get a list of users who have edited this article, not including the user who made
 713          * the most recent revision, which you can get from $article->getUser() if you want it
 714          * @return UserArrayFromResult
 715          */
 716         public function getContributors() {
 717                 # @todo FIXME: This is expensive; cache this info somewhere.
 718
 719                 $dbr = wfGetDB( DB_SLAVE );
 720
 721                 if ( $dbr->implicitGroupby() ) {
 722                         $realNameField = 'user_real_name';
 723                 } else {
 724                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 725                 }
 726
 727                 $tables = array( 'revision', 'user' );
 728
 729                 $fields = array(
 730                         'rev_user as user_id',
 731                         'rev_user_text AS user_name',
 732                         $realNameField,
 733                         'MAX(rev_timestamp) AS timestamp',
 734                 );
 735
 736                 $conds = array( 'rev_page' => $this->getId() );
 737
 738                 // The user who made the top revision gets credited as "this page was last edited by
 739                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 740                 $user = $this->getUser();
 741                 if ( $user ) {
 742                         $conds[] = "rev_user != $user";
 743                 } else {
 744                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 745                 }
 746
 747                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 748
 749                 $jconds = array(
 750                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 751                 );
 752
 753                 $options = array(
 754                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 755                         'ORDER BY' => 'timestamp DESC',
 756                 );
 757
 758                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 759                 return new UserArrayFromResult( $res );
 760         }
 761
 762         /**
 763          * Get the last N authors
 764          * @param $num Integer: number of revisions to get
 765          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 766          * @return array Array of authors, duplicates not removed
 767          */
 768         public function getLastNAuthors( $num, $revLatest = 0 ) {
 769                 wfProfileIn( __METHOD__ );
 770                 // First try the slave
 771                 // If that doesn't have the latest revision, try the master
 772                 $continue = 2;
 773                 $db = wfGetDB( DB_SLAVE );
 774
 775                 do {
 776                         $res = $db->select( array( 'page', 'revision' ),
 777                                 array( 'rev_id', 'rev_user_text' ),
 778                                 array(
 779                                         'page_namespace' => $this->mTitle->getNamespace(),
 780                                         'page_title' => $this->mTitle->getDBkey(),
 781                                         'rev_page = page_id'
 782                                 ), __METHOD__,
 783                                 array(
 784                                         'ORDER BY' => 'rev_timestamp DESC',
 785                                         'LIMIT' => $num
 786                                 )
 787                         );
 788
 789                         if ( !$res ) {
 790                                 wfProfileOut( __METHOD__ );
 791                                 return array();
 792                         }
 793
 794                         $row = $db->fetchObject( $res );
 795
 796                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 797                                 $db = wfGetDB( DB_MASTER );
 798                                 $continue--;
 799                         } else {
 800                                 $continue = 0;
 801                         }
 802                 } while ( $continue );
 803
 804                 $authors = array( $row->rev_user_text );
 805
 806                 foreach ( $res as $row ) {
 807                         $authors[] = $row->rev_user_text;
 808                 }
 809
 810                 wfProfileOut( __METHOD__ );
 811                 return $authors;
 812         }
 813
 814         /**
 815          * Should the parser cache be used?
 816          *
 817          * @param $parserOptions ParserOptions to check
 818          * @param $oldid int
 819          * @return boolean
 820          */
 821         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 822                 global $wgEnableParserCache;
 823
 824                 return $wgEnableParserCache
 825                         && $parserOptions->getStubThreshold() == 0
 826                         && $this->mTitle->exists()
 827                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 828                         && $this->mTitle->isWikitextPage();
 829         }
 830
 831         /**
 832          * Get a ParserOutput for the given ParserOptions and revision ID.
 833          * The parser cache will be used if possible.
 834          *
 835          * @since 1.19
 836          * @param $parserOptions ParserOptions to use for the parse operation
 837          * @param $oldid Revision ID to get the text from, passing null or 0 will
 838          *               get the current revision (default value)
 839          * @return ParserOutput or false if the revision was not found
 840          */
 841         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
 842                 wfProfileIn( __METHOD__ );
 843
 844                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 845                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 846                 if ( $parserOptions->getStubThreshold() ) {
 847                         wfIncrStats( 'pcache_miss_stub' );
 848                 }
 849
 850                 if ( $useParserCache ) {
 851                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 852                         if ( $parserOutput !== false ) {
 853                                 wfProfileOut( __METHOD__ );
 854                                 return $parserOutput;
 855                         }
 856                 }
 857
 858                 if ( $oldid === null || $oldid === 0 ) {
 859                         $oldid = $this->getLatest();
 860                 }
 861
 862                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
 863                 $pool->execute();
 864
 865                 wfProfileOut( __METHOD__ );
 866
 867                 return $pool->getParserOutput();
 868         }
 869
 870         /**
 871          * Do standard deferred updates after page view
 872          * @param $user User The relevant user
 873          */
 874         public function doViewUpdates( User $user ) {
 875                 global $wgDisableCounters;
 876                 if ( wfReadOnly() ) {
 877                         return;
 878                 }
 879
 880                 # Don't update page view counters on views from bot users (bug 14044)
 881                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
 882                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
 883                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
 884                 }
 885
 886                 # Update newtalk / watchlist notification status
 887                 $user->clearNotification( $this->mTitle );
 888         }
 889
 890         /**
 891          * Perform the actions of a page purging
 892          * @return bool
 893          */
 894         public function doPurge() {
 895                 global $wgUseSquid;
 896
 897                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 898                         return false;
 899                 }
 900
 901                 // Invalidate the cache
 902                 $this->mTitle->invalidateCache();
 903                 $this->clear();
 904
 905                 if ( $wgUseSquid ) {
 906                         // Commit the transaction before the purge is sent
 907                         $dbw = wfGetDB( DB_MASTER );
 908                         $dbw->commit( __METHOD__ );
 909
 910                         // Send purge
 911                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 912                         $update->doUpdate();
 913                 }
 914
 915                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 916                         if ( $this->mTitle->exists() ) {
 917                                 $text = $this->getRawText();
 918                         } else {
 919                                 $text = false;
 920                         }
 921
 922                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 923                 }
 924                 return true;
 925         }
 926
 927         /**
 928          * Insert a new empty page record for this article.
 929          * This *must* be followed up by creating a revision
 930          * and running $this->updateRevisionOn( ... );
 931          * or else the record will be left in a funky state.
 932          * Best if all done inside a transaction.
 933          *
 934          * @param $dbw DatabaseBase
 935          * @return int The newly created page_id key, or false if the title already existed
 936          */
 937         public function insertOn( $dbw ) {
 938                 wfProfileIn( __METHOD__ );
 939
 940                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 941                 $dbw->insert( 'page', array(
 942                         'page_id'           => $page_id,
 943                         'page_namespace'    => $this->mTitle->getNamespace(),
 944                         'page_title'        => $this->mTitle->getDBkey(),
 945                         'page_counter'      => 0,
 946                         'page_restrictions' => '',
 947                         'page_is_redirect'  => 0, # Will set this shortly...
 948                         'page_is_new'       => 1,
 949                         'page_random'       => wfRandom(),
 950                         'page_touched'      => $dbw->timestamp(),
 951                         'page_latest'       => 0, # Fill this in shortly...
 952                         'page_len'          => 0, # Fill this in shortly...
 953                 ), __METHOD__, 'IGNORE' );
 954
 955                 $affected = $dbw->affectedRows();
 956
 957                 if ( $affected ) {
 958                         $newid = $dbw->insertId();
 959                         $this->mTitle->resetArticleID( $newid );
 960                 }
 961                 wfProfileOut( __METHOD__ );
 962
 963                 return $affected ? $newid : false;
 964         }
 965
 966         /**
 967          * Update the page record to point to a newly saved revision.
 968          *
 969          * @param $dbw DatabaseBase: object
 970          * @param $revision Revision: For ID number, and text used to set
 971          *                  length and redirect status fields
 972          * @param $lastRevision Integer: if given, will not overwrite the page field
 973          *                      when different from the currently set value.
 974          *                      Giving 0 indicates the new page flag should be set
 975          *                      on.
 976          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 977          *                           removing rows in redirect table.
 978          * @return bool true on success, false on failure
 979          * @private
 980          */
 981         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 982                 wfProfileIn( __METHOD__ );
 983
 984                 $text = $revision->getText();
 985                 $len = strlen( $text );
 986                 $rt = Title::newFromRedirectRecurse( $text );
 987
 988                 $conditions = array( 'page_id' => $this->getId() );
 989
 990                 if ( !is_null( $lastRevision ) ) {
 991                         # An extra check against threads stepping on each other
 992                         $conditions['page_latest'] = $lastRevision;
 993                 }
 994
 995                 $now = wfTimestampNow();
 996                 $dbw->update( 'page',
 997                         array( /* SET */
 998                                 'page_latest'      => $revision->getId(),
 999                                 'page_touched'     => $dbw->timestamp( $now ),
1000                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1001                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1002                                 'page_len'         => $len,
1003                         ),
1004                         $conditions,
1005                         __METHOD__ );
1006
1007                 $result = $dbw->affectedRows() != 0;
1008                 if ( $result ) {
1009                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1010                         $this->setLastEdit( $revision );
1011                         $this->setCachedLastEditTime( $now );
1012                         $this->mLatest = $revision->getId();
1013                         $this->mIsRedirect = (bool)$rt;
1014                         # Update the LinkCache.
1015                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1016                 }
1017
1018                 wfProfileOut( __METHOD__ );
1019                 return $result;
1020         }
1021
1022         /**
1023          * Add row to the redirect table if this is a redirect, remove otherwise.
1024          *
1025          * @param $dbw DatabaseBase
1026          * @param $redirectTitle Title object pointing to the redirect target,
1027          *                       or NULL if this is not a redirect
1028          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1029          *                           removing rows in redirect table.
1030          * @return bool true on success, false on failure
1031          * @private
1032          */
1033         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1034                 // Always update redirects (target link might have changed)
1035                 // Update/Insert if we don't know if the last revision was a redirect or not
1036                 // Delete if changing from redirect to non-redirect
1037                 $isRedirect = !is_null( $redirectTitle );
1038
1039                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1040                         return true;
1041                 }
1042
1043                 wfProfileIn( __METHOD__ );
1044                 if ( $isRedirect ) {
1045                         $this->insertRedirectEntry( $redirectTitle );
1046                 } else {
1047                         // This is not a redirect, remove row from redirect table
1048                         $where = array( 'rd_from' => $this->getId() );
1049                         $dbw->delete( 'redirect', $where, __METHOD__ );
1050                 }
1051
1052                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1053                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1054                 }
1055                 wfProfileOut( __METHOD__ );
1056
1057                 return ( $dbw->affectedRows() != 0 );
1058         }
1059
1060         /**
1061          * If the given revision is newer than the currently set page_latest,
1062          * update the page record. Otherwise, do nothing.
1063          *
1064          * @param $dbw DatabaseBase object
1065          * @param $revision Revision object
1066          * @return mixed
1067          */
1068         public function updateIfNewerOn( $dbw, $revision ) {
1069                 wfProfileIn( __METHOD__ );
1070
1071                 $row = $dbw->selectRow(
1072                         array( 'revision', 'page' ),
1073                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1074                         array(
1075                                 'page_id' => $this->getId(),
1076                                 'page_latest=rev_id' ),
1077                         __METHOD__ );
1078
1079                 if ( $row ) {
1080                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1081                                 wfProfileOut( __METHOD__ );
1082                                 return false;
1083                         }
1084                         $prev = $row->rev_id;
1085                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1086                 } else {
1087                         # No or missing previous revision; mark the page as new
1088                         $prev = 0;
1089                         $lastRevIsRedirect = null;
1090                 }
1091
1092                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1093
1094                 wfProfileOut( __METHOD__ );
1095                 return $ret;
1096         }
1097
1098         /**
1099          * Get the text that needs to be saved in order to undo all revisions
1100          * between $undo and $undoafter. Revisions must belong to the same page,
1101          * must exist and must not be deleted
1102          * @param $undo Revision
1103          * @param $undoafter Revision Must be an earlier revision than $undo
1104          * @return mixed string on success, false on failure
1105          */
1106         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1107                 $cur_text = $this->getRawText();
1108                 if ( $cur_text === false ) {
1109                         return false; // no page
1110                 }
1111                 $undo_text = $undo->getText();
1112                 $undoafter_text = $undoafter->getText();
1113
1114                 if ( $cur_text == $undo_text ) {
1115                         # No use doing a merge if it's just a straight revert.
1116                         return $undoafter_text;
1117                 }
1118
1119                 $undone_text = '';
1120
1121                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
1122                         return false;
1123                 }
1124
1125                 return $undone_text;
1126         }
1127
1128         /**
1129          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1130          * @param $text String: new text of the section
1131          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1132          * @param $edittime String: revision timestamp or null to use the current revision
1133          * @return string Complete article text, or null if error
1134          */
1135         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1136                 wfProfileIn( __METHOD__ );
1137
1138                 if ( strval( $section ) == '' ) {
1139                         // Whole-page edit; let the whole text through
1140                 } else {
1141                         // Bug 30711: always use current version when adding a new section
1142                         if ( is_null( $edittime ) || $section == 'new' ) {
1143                                 $oldtext = $this->getRawText();
1144                                 if ( $oldtext === false ) {
1145                                         wfDebug( __METHOD__ . ": no page text\n" );
1146                                         wfProfileOut( __METHOD__ );
1147                                         return null;
1148                                 }
1149                         } else {
1150                                 $dbw = wfGetDB( DB_MASTER );
1151                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1152
1153                                 if ( !$rev ) {
1154                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1155                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1156                                         wfProfileOut( __METHOD__ );
1157                                         return null;
1158                                 }
1159
1160                                 $oldtext = $rev->getText();
1161                         }
1162
1163                         if ( $section == 'new' ) {
1164                                 # Inserting a new section
1165                                 $subject = $sectionTitle ? wfMsgForContent( 'newsectionheaderdefaultlevel', $sectionTitle ) . "\n\n" : '';
1166                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
1167                                         $text = strlen( trim( $oldtext ) ) > 0
1168                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1169                                                 : "{$subject}{$text}";
1170                                 }
1171                         } else {
1172                                 # Replacing an existing section; roll out the big guns
1173                                 global $wgParser;
1174
1175                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1176                         }
1177                 }
1178
1179                 wfProfileOut( __METHOD__ );
1180                 return $text;
1181         }
1182
1183         /**
1184          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1185          * @param $flags Int
1186          * @return Int updated $flags
1187          */
1188         function checkFlags( $flags ) {
1189                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1190                         if ( $this->mTitle->getArticleID() ) {
1191                                 $flags |= EDIT_UPDATE;
1192                         } else {
1193                                 $flags |= EDIT_NEW;
1194                         }
1195                 }
1196
1197                 return $flags;
1198         }
1199
1200         /**
1201          * Change an existing article or create a new article. Updates RC and all necessary caches,
1202          * optionally via the deferred update array.
1203          *
1204          * @param $text String: new text
1205          * @param $summary String: edit summary
1206          * @param $flags Integer bitfield:
1207          *      EDIT_NEW
1208          *          Article is known or assumed to be non-existent, create a new one
1209          *      EDIT_UPDATE
1210          *          Article is known or assumed to be pre-existing, update it
1211          *      EDIT_MINOR
1212          *          Mark this edit minor, if the user is allowed to do so
1213          *      EDIT_SUPPRESS_RC
1214          *          Do not log the change in recentchanges
1215          *      EDIT_FORCE_BOT
1216          *          Mark the edit a "bot" edit regardless of user rights
1217          *      EDIT_DEFER_UPDATES
1218          *          Defer some of the updates until the end of index.php
1219          *      EDIT_AUTOSUMMARY
1220          *          Fill in blank summaries with generated text where possible
1221          *
1222          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1223          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1224          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1225          * edit-already-exists error will be returned. These two conditions are also possible with
1226          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1227          *
1228          * @param $baseRevId int the revision ID this edit was based off, if any
1229          * @param $user User the user doing the edit
1230          *
1231          * @return Status object. Possible errors:
1232          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1233          *     edit-gone-missing:       In update mode, but the article didn't exist
1234          *     edit-conflict:           In update mode, the article changed unexpectedly
1235          *     edit-no-change:          Warning that the text was the same as before
1236          *     edit-already-exists:     In creation mode, but the article already exists
1237          *
1238          *  Extensions may define additional errors.
1239          *
1240          *  $return->value will contain an associative array with members as follows:
1241          *     new:                     Boolean indicating if the function attempted to create a new article
1242          *     revision:                The revision object for the inserted revision, or null
1243          *
1244          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1245          */
1246         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1247                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1248
1249                 # Low-level sanity check
1250                 if ( $this->mTitle->getText() === '' ) {
1251                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1252                 }
1253
1254                 wfProfileIn( __METHOD__ );
1255
1256                 $user = is_null( $user ) ? $wgUser : $user;
1257                 $status = Status::newGood( array() );
1258
1259                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1260                 $this->loadPageData( 'fromdbmaster' );
1261
1262                 $flags = $this->checkFlags( $flags );
1263
1264                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1265                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1266                 {
1267                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1268
1269                         if ( $status->isOK() ) {
1270                                 $status->fatal( 'edit-hook-aborted' );
1271                         }
1272
1273                         wfProfileOut( __METHOD__ );
1274                         return $status;
1275                 }
1276
1277                 # Silently ignore EDIT_MINOR if not allowed
1278                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1279                 $bot = $flags & EDIT_FORCE_BOT;
1280
1281                 $oldtext = $this->getRawText(); // current revision
1282                 $oldsize = strlen( $oldtext );
1283                 $oldid = $this->getLatest();
1284                 $oldIsRedirect = $this->isRedirect();
1285                 $oldcountable = $this->isCountable();
1286
1287                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1288                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1289                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1290                 }
1291
1292                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1293                 $text = $editInfo->pst;
1294                 $newsize = strlen( $text );
1295
1296                 $dbw = wfGetDB( DB_MASTER );
1297                 $now = wfTimestampNow();
1298                 $this->mTimestamp = $now;
1299
1300                 if ( $flags & EDIT_UPDATE ) {
1301                         # Update article, but only if changed.
1302                         $status->value['new'] = false;
1303
1304                         if ( !$oldid ) {
1305                                 # Article gone missing
1306                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1307                                 $status->fatal( 'edit-gone-missing' );
1308
1309                                 wfProfileOut( __METHOD__ );
1310                                 return $status;
1311                         }
1312
1313                         # Make sure the revision is either completely inserted or not inserted at all
1314                         if ( !$wgDBtransactions ) {
1315                                 $userAbort = ignore_user_abort( true );
1316                         }
1317
1318                         $revision = new Revision( array(
1319                                 'page'       => $this->getId(),
1320                                 'comment'    => $summary,
1321                                 'minor_edit' => $isminor,
1322                                 'text'       => $text,
1323                                 'parent_id'  => $oldid,
1324                                 'user'       => $user->getId(),
1325                                 'user_text'  => $user->getName(),
1326                                 'timestamp'  => $now
1327                         ) );
1328
1329                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1330
1331                         if ( $changed ) {
1332                                 $dbw->begin( __METHOD__ );
1333                                 $revisionId = $revision->insertOn( $dbw );
1334
1335                                 # Update page
1336                                 #
1337                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1338                                 # during the course of this function. This makes sure that EditPage can detect
1339                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1340                                 # before this function is called. A previous function used a separate query, this
1341                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1342                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1343
1344                                 if ( !$ok ) {
1345                                         /* Belated edit conflict! Run away!! */
1346                                         $status->fatal( 'edit-conflict' );
1347
1348                                         # Delete the invalid revision if the DB is not transactional
1349                                         if ( !$wgDBtransactions ) {
1350                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1351                                         }
1352
1353                                         $revisionId = 0;
1354                                         $dbw->rollback( __METHOD__ );
1355                                 } else {
1356                                         global $wgUseRCPatrol;
1357                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1358                                         # Update recentchanges
1359                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1360                                                 # Mark as patrolled if the user can do so
1361                                                 $patrolled = $wgUseRCPatrol && !count(
1362                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1363                                                 # Add RC row to the DB
1364                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1365                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1366                                                         $revisionId, $patrolled
1367                                                 );
1368
1369                                                 # Log auto-patrolled edits
1370                                                 if ( $patrolled ) {
1371                                                         PatrolLog::record( $rc, true, $user );
1372                                                 }
1373                                         }
1374                                         $user->incEditCount();
1375                                         $dbw->commit( __METHOD__ );
1376                                 }
1377                         } else {
1378                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1379                                 // related variables correctly
1380                                 $revision->setId( $this->getLatest() );
1381                         }
1382
1383                         if ( !$wgDBtransactions ) {
1384                                 ignore_user_abort( $userAbort );
1385                         }
1386
1387                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1388                         if ( !$status->isOK() ) {
1389                                 wfProfileOut( __METHOD__ );
1390                                 return $status;
1391                         }
1392
1393                         # Update links tables, site stats, etc.
1394                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1395                                 'oldcountable' => $oldcountable ) );
1396
1397                         if ( !$changed ) {
1398                                 $status->warning( 'edit-no-change' );
1399                                 $revision = null;
1400                                 // Update page_touched, this is usually implicit in the page update
1401                                 // Other cache updates are done in onArticleEdit()
1402                                 $this->mTitle->invalidateCache();
1403                         }
1404                 } else {
1405                         # Create new article
1406                         $status->value['new'] = true;
1407
1408                         $dbw->begin( __METHOD__ );
1409
1410                         # Add the page record; stake our claim on this title!
1411                         # This will return false if the article already exists
1412                         $newid = $this->insertOn( $dbw );
1413
1414                         if ( $newid === false ) {
1415                                 $dbw->rollback( __METHOD__ );
1416                                 $status->fatal( 'edit-already-exists' );
1417
1418                                 wfProfileOut( __METHOD__ );
1419                                 return $status;
1420                         }
1421
1422                         # Save the revision text...
1423                         $revision = new Revision( array(
1424                                 'page'       => $newid,
1425                                 'comment'    => $summary,
1426                                 'minor_edit' => $isminor,
1427                                 'text'       => $text,
1428                                 'user'       => $user->getId(),
1429                                 'user_text'  => $user->getName(),
1430                                 'timestamp'  => $now
1431                         ) );
1432                         $revisionId = $revision->insertOn( $dbw );
1433
1434                         # Update the page record with revision data
1435                         $this->updateRevisionOn( $dbw, $revision, 0 );
1436
1437                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1438
1439                         # Update recentchanges
1440                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1441                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1442
1443                                 # Mark as patrolled if the user can do so
1444                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1445                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1446                                 # Add RC row to the DB
1447                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1448                                         '', strlen( $text ), $revisionId, $patrolled );
1449
1450                                 # Log auto-patrolled edits
1451                                 if ( $patrolled ) {
1452                                         PatrolLog::record( $rc, true, $user );
1453                                 }
1454                         }
1455                         $user->incEditCount();
1456                         $dbw->commit( __METHOD__ );
1457
1458                         # Update links, etc.
1459                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1460
1461                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1462                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1463                 }
1464
1465                 # Do updates right now unless deferral was requested
1466                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1467                         DeferredUpdates::doUpdates();
1468                 }
1469
1470                 // Return the new revision (or null) to the caller
1471                 $status->value['revision'] = $revision;
1472
1473                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1474                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1475
1476                 # Promote user to any groups they meet the criteria for
1477                 $user->addAutopromoteOnceGroups( 'onEdit' );
1478
1479                 wfProfileOut( __METHOD__ );
1480                 return $status;
1481         }
1482
1483         /**
1484          * Get parser options suitable for rendering the primary article wikitext
1485          * @param User|string $user User object or 'canonical'
1486          * @return ParserOptions
1487          */
1488         public function makeParserOptions( $user ) {
1489                 global $wgContLang;
1490                 if ( $user instanceof User ) { // settings per user (even anons)
1491                         $options = ParserOptions::newFromUser( $user );
1492                 } else { // canonical settings
1493                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1494                 }
1495                 $options->enableLimitReport(); // show inclusion/loop reports
1496                 $options->setTidy( true ); // fix bad HTML
1497                 return $options;
1498         }
1499
1500         /**
1501          * Prepare text which is about to be saved.
1502          * Returns a stdclass with source, pst and output members
1503          * @return bool|object
1504          */
1505         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1506                 global $wgParser, $wgContLang, $wgUser;
1507                 $user = is_null( $user ) ? $wgUser : $user;
1508                 // @TODO fixme: check $user->getId() here???
1509                 if ( $this->mPreparedEdit
1510                         && $this->mPreparedEdit->newText == $text
1511                         && $this->mPreparedEdit->revid == $revid
1512                 ) {
1513                         // Already prepared
1514                         return $this->mPreparedEdit;
1515                 }
1516
1517                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1518                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1519
1520                 $edit = (object)array();
1521                 $edit->revid = $revid;
1522                 $edit->newText = $text;
1523                 $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
1524                 $edit->popts = $this->makeParserOptions( 'canonical' );
1525                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1526                 $edit->oldText = $this->getRawText();
1527
1528                 $this->mPreparedEdit = $edit;
1529
1530                 return $edit;
1531         }
1532
1533         /**
1534          * Do standard deferred updates after page edit.
1535          * Update links tables, site stats, search index and message cache.
1536          * Purges pages that include this page if the text was changed here.
1537          * Every 100th edit, prune the recent changes table.
1538          *
1539          * @private
1540          * @param $revision Revision object
1541          * @param $user User object that did the revision
1542          * @param $options Array of options, following indexes are used:
1543          * - changed: boolean, whether the revision changed the content (default true)
1544          * - created: boolean, whether the revision created the page (default false)
1545          * - oldcountable: boolean or null (default null):
1546          *   - boolean: whether the page was counted as an article before that
1547          *     revision, only used in changed is true and created is false
1548          *   - null: don't change the article count
1549          */
1550         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1551                 global $wgEnableParserCache;
1552
1553                 wfProfileIn( __METHOD__ );
1554
1555                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1556                 $text = $revision->getText();
1557
1558                 # Parse the text
1559                 # Be careful not to double-PST: $text is usually already PST-ed once
1560                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1561                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1562                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1563                 } else {
1564                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1565                         $editInfo = $this->mPreparedEdit;
1566                 }
1567
1568                 # Save it to the parser cache
1569                 if ( $wgEnableParserCache ) {
1570                         $parserCache = ParserCache::singleton();
1571                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1572                 }
1573
1574                 # Update the links tables
1575                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1576                 $u->doUpdate();
1577
1578                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1579
1580                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1581                         if ( 0 == mt_rand( 0, 99 ) ) {
1582                                 // Flush old entries from the `recentchanges` table; we do this on
1583                                 // random requests so as to avoid an increase in writes for no good reason
1584                                 global $wgRCMaxAge;
1585
1586                                 $dbw = wfGetDB( DB_MASTER );
1587                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1588                                 $dbw->delete(
1589                                         'recentchanges',
1590                                         array( "rc_timestamp < '$cutoff'" ),
1591                                         __METHOD__
1592                                 );
1593                         }
1594                 }
1595
1596                 if ( !$this->mTitle->exists() ) {
1597                         wfProfileOut( __METHOD__ );
1598                         return;
1599                 }
1600
1601                 $id = $this->getId();
1602                 $title = $this->mTitle->getPrefixedDBkey();
1603                 $shortTitle = $this->mTitle->getDBkey();
1604
1605                 if ( !$options['changed'] ) {
1606                         $good = 0;
1607                         $total = 0;
1608                 } elseif ( $options['created'] ) {
1609                         $good = (int)$this->isCountable( $editInfo );
1610                         $total = 1;
1611                 } elseif ( $options['oldcountable'] !== null ) {
1612                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1613                         $total = 0;
1614                 } else {
1615                         $good = 0;
1616                         $total = 0;
1617                 }
1618
1619                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1620                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
1621
1622                 # If this is another user's talk page, update newtalk.
1623                 # Don't do this if $options['changed'] = false (null-edits) nor if
1624                 # it's a minor edit and the user doesn't want notifications for those.
1625                 if ( $options['changed']
1626                         && $this->mTitle->getNamespace() == NS_USER_TALK
1627                         && $shortTitle != $user->getTitleKey()
1628                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1629                 ) {
1630                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1631                                 $other = User::newFromName( $shortTitle, false );
1632                                 if ( !$other ) {
1633                                         wfDebug( __METHOD__ . ": invalid username\n" );
1634                                 } elseif ( User::isIP( $shortTitle ) ) {
1635                                         // An anonymous user
1636                                         $other->setNewtalk( true );
1637                                 } elseif ( $other->isLoggedIn() ) {
1638                                         $other->setNewtalk( true );
1639                                 } else {
1640                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1641                                 }
1642                         }
1643                 }
1644
1645                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1646                         MessageCache::singleton()->replace( $shortTitle, $text );
1647                 }
1648
1649                 if( $options['created'] ) {
1650                         self::onArticleCreate( $this->mTitle );
1651                 } else {
1652                         self::onArticleEdit( $this->mTitle );
1653                 }
1654
1655                 wfProfileOut( __METHOD__ );
1656         }
1657
1658         /**
1659          * Edit an article without doing all that other stuff
1660          * The article must already exist; link tables etc
1661          * are not updated, caches are not flushed.
1662          *
1663          * @param $text String: text submitted
1664          * @param $user User The relevant user
1665          * @param $comment String: comment submitted
1666          * @param $minor Boolean: whereas it's a minor modification
1667          */
1668         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1669                 wfProfileIn( __METHOD__ );
1670
1671                 $dbw = wfGetDB( DB_MASTER );
1672                 $revision = new Revision( array(
1673                         'page'       => $this->getId(),
1674                         'text'       => $text,
1675                         'comment'    => $comment,
1676                         'minor_edit' => $minor ? 1 : 0,
1677                 ) );
1678                 $revision->insertOn( $dbw );
1679                 $this->updateRevisionOn( $dbw, $revision );
1680
1681                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1682
1683                 wfProfileOut( __METHOD__ );
1684         }
1685
1686         /**
1687          * Update the article's restriction field, and leave a log entry.
1688          * This works for protection both existing and non-existing pages.
1689          *
1690          * @param $limit Array: set of restriction keys
1691          * @param $reason String
1692          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1693          * @param $expiry Array: per restriction type expiration
1694          * @param $user User The user updating the restrictions
1695          * @return bool true on success
1696          */
1697         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1698                 global $wgContLang;
1699
1700                 if ( wfReadOnly() ) {
1701                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1702                 }
1703
1704                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1705
1706                 $id = $this->mTitle->getArticleID();
1707
1708                 if ( !$cascade ) {
1709                         $cascade = false;
1710                 }
1711
1712                 // Take this opportunity to purge out expired restrictions
1713                 Title::purgeExpiredRestrictions();
1714
1715                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1716                 # we expect a single selection, but the schema allows otherwise.
1717                 $isProtected = false;
1718                 $protect = false;
1719                 $changed = false;
1720
1721                 $dbw = wfGetDB( DB_MASTER );
1722
1723                 foreach ( $restrictionTypes as $action ) {
1724                         if ( !isset( $expiry[$action] ) ) {
1725                                 $expiry[$action] = $dbw->getInfinity();
1726                         }
1727                         if ( !isset( $limit[$action] ) ) {
1728                                 $limit[$action] = '';
1729                         } elseif ( $limit[$action] != '' ) {
1730                                 $protect = true;
1731                         }
1732
1733                         # Get current restrictions on $action
1734                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1735                         if ( $current != '' ) {
1736                                 $isProtected = true;
1737                         }
1738
1739                         if ( $limit[$action] != $current ) {
1740                                 $changed = true;
1741                         } elseif ( $limit[$action] != '' ) {
1742                                 # Only check expiry change if the action is actually being
1743                                 # protected, since expiry does nothing on an not-protected
1744                                 # action.
1745                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1746                                         $changed = true;
1747                                 }
1748                         }
1749                 }
1750
1751                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1752                         $changed = true;
1753                 }
1754
1755                 # If nothing's changed, do nothing
1756                 if ( !$changed ) {
1757                         return Status::newGood();
1758                 }
1759
1760                 if ( !$protect ) { # No protection at all means unprotection
1761                         $revCommentMsg = 'unprotectedarticle';
1762                         $logAction = 'unprotect';
1763                 } elseif ( $isProtected ) {
1764                         $revCommentMsg = 'modifiedarticleprotection';
1765                         $logAction = 'modify';
1766                 } else {
1767                         $revCommentMsg = 'protectedarticle';
1768                         $logAction = 'protect';
1769                 }
1770
1771                 $encodedExpiry = array();
1772                 $protectDescription = '';
1773                 foreach ( $limit as $action => $restrictions ) {
1774                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1775                         if ( $restrictions != '' ) {
1776                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1777                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1778                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
1779                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1780                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1781                                                 $wgContLang->time( $expiry[$action], false, false ) );
1782                                 } else {
1783                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
1784                                 }
1785
1786                                 $protectDescription .= ') ';
1787                         }
1788                 }
1789                 $protectDescription = trim( $protectDescription );
1790
1791                 if ( $id ) { # Protection of existing page
1792                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1793                                 return Status::newGood();
1794                         }
1795
1796                         # Only restrictions with the 'protect' right can cascade...
1797                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1798                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1799
1800                         # The schema allows multiple restrictions
1801                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1802                                 $cascade = false;
1803                         }
1804
1805                         # Update restrictions table
1806                         foreach ( $limit as $action => $restrictions ) {
1807                                 if ( $restrictions != '' ) {
1808                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1809                                                 array( 'pr_page' => $id,
1810                                                         'pr_type' => $action,
1811                                                         'pr_level' => $restrictions,
1812                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1813                                                         'pr_expiry' => $encodedExpiry[$action]
1814                                                 ),
1815                                                 __METHOD__
1816                                         );
1817                                 } else {
1818                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1819                                                 'pr_type' => $action ), __METHOD__ );
1820                                 }
1821                         }
1822
1823                         # Prepare a null revision to be added to the history
1824                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
1825                         if ( $reason ) {
1826                                 $editComment .= ": $reason";
1827                         }
1828                         if ( $protectDescription ) {
1829                                 $editComment .= " ($protectDescription)";
1830                         }
1831                         if ( $cascade ) {
1832                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1833                         }
1834
1835                         # Insert a null revision
1836                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1837                         $nullRevId = $nullRevision->insertOn( $dbw );
1838
1839                         $latest = $this->getLatest();
1840                         # Update page record
1841                         $dbw->update( 'page',
1842                                 array( /* SET */
1843                                         'page_touched' => $dbw->timestamp(),
1844                                         'page_restrictions' => '',
1845                                         'page_latest' => $nullRevId
1846                                 ), array( /* WHERE */
1847                                         'page_id' => $id
1848                                 ), __METHOD__
1849                         );
1850
1851                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1852                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1853                 } else { # Protection of non-existing page (also known as "title protection")
1854                         # Cascade protection is meaningless in this case
1855                         $cascade = false;
1856
1857                         if ( $limit['create'] != '' ) {
1858                                 $dbw->replace( 'protected_titles',
1859                                         array( array( 'pt_namespace', 'pt_title' ) ),
1860                                         array(
1861                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1862                                                 'pt_title' => $this->mTitle->getDBkey(),
1863                                                 'pt_create_perm' => $limit['create'],
1864                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
1865                                                 'pt_expiry' => $encodedExpiry['create'],
1866                                                 'pt_user' => $user->getId(),
1867                                                 'pt_reason' => $reason,
1868                                         ), __METHOD__
1869                                 );
1870                         } else {
1871                                 $dbw->delete( 'protected_titles',
1872                                         array(
1873                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1874                                                 'pt_title' => $this->mTitle->getDBkey()
1875                                         ), __METHOD__
1876                                 );
1877                         }
1878                 }
1879
1880                 $this->mTitle->flushRestrictions();
1881
1882                 if ( $logAction == 'unprotect' ) {
1883                         $logParams = array();
1884                 } else {
1885                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
1886                 }
1887
1888                 # Update the protection log
1889                 $log = new LogPage( 'protect' );
1890                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
1891
1892                 return Status::newGood();
1893         }
1894
1895         /**
1896          * Take an array of page restrictions and flatten it to a string
1897          * suitable for insertion into the page_restrictions field.
1898          * @param $limit Array
1899          * @return String
1900          */
1901         protected static function flattenRestrictions( $limit ) {
1902                 if ( !is_array( $limit ) ) {
1903                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1904                 }
1905
1906                 $bits = array();
1907                 ksort( $limit );
1908
1909                 foreach ( $limit as $action => $restrictions ) {
1910                         if ( $restrictions != '' ) {
1911                                 $bits[] = "$action=$restrictions";
1912                         }
1913                 }
1914
1915                 return implode( ':', $bits );
1916         }
1917
1918         /**
1919          * Same as doDeleteArticleReal(), but returns more detailed success/failure status
1920          * Deletes the article with database consistency, writes logs, purges caches
1921          *
1922          * @param $reason string delete reason for deletion log
1923          * @param $suppress int bitfield
1924          *      Revision::DELETED_TEXT
1925          *      Revision::DELETED_COMMENT
1926          *      Revision::DELETED_USER
1927          *      Revision::DELETED_RESTRICTED
1928          * @param $id int article ID
1929          * @param $commit boolean defaults to true, triggers transaction end
1930          * @param &$error Array of errors to append to
1931          * @param $user User The deleting user
1932          * @return boolean true if successful
1933          */
1934         public function doDeleteArticle(
1935                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1936         ) {
1937                 return $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user )
1938                         == WikiPage::DELETE_SUCCESS;
1939         }
1940
1941         /**
1942          * Back-end article deletion
1943          * Deletes the article with database consistency, writes logs, purges caches
1944          *
1945          * @param $reason string delete reason for deletion log
1946          * @param $suppress int bitfield
1947          *      Revision::DELETED_TEXT
1948          *      Revision::DELETED_COMMENT
1949          *      Revision::DELETED_USER
1950          *      Revision::DELETED_RESTRICTED
1951          * @param $id int article ID
1952          * @param $commit boolean defaults to true, triggers transaction end
1953          * @param &$error Array of errors to append to
1954          * @param $user User The deleting user
1955          * @return int: One of WikiPage::DELETE_* constants
1956          */
1957         public function doDeleteArticleReal(
1958                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1959         ) {
1960                 global $wgUser;
1961                 $user = is_null( $user ) ? $wgUser : $user;
1962
1963                 wfDebug( __METHOD__ . "\n" );
1964
1965                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1966                         return WikiPage::DELETE_HOOK_ABORTED;
1967                 }
1968                 $dbw = wfGetDB( DB_MASTER );
1969                 $t = $this->mTitle->getDBkey();
1970                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1971
1972                 if ( $t === '' || $id == 0 ) {
1973                         return WikiPage::DELETE_NO_PAGE;
1974                 }
1975
1976                 // Bitfields to further suppress the content
1977                 if ( $suppress ) {
1978                         $bitfield = 0;
1979                         // This should be 15...
1980                         $bitfield |= Revision::DELETED_TEXT;
1981                         $bitfield |= Revision::DELETED_COMMENT;
1982                         $bitfield |= Revision::DELETED_USER;
1983                         $bitfield |= Revision::DELETED_RESTRICTED;
1984                 } else {
1985                         $bitfield = 'rev_deleted';
1986                 }
1987
1988                 $dbw->begin( __METHOD__ );
1989                 // For now, shunt the revision data into the archive table.
1990                 // Text is *not* removed from the text table; bulk storage
1991                 // is left intact to avoid breaking block-compression or
1992                 // immutable storage schemes.
1993                 //
1994                 // For backwards compatibility, note that some older archive
1995                 // table entries will have ar_text and ar_flags fields still.
1996                 //
1997                 // In the future, we may keep revisions and mark them with
1998                 // the rev_deleted field, which is reserved for this purpose.
1999                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2000                         array(
2001                                 'ar_namespace'  => 'page_namespace',
2002                                 'ar_title'      => 'page_title',
2003                                 'ar_comment'    => 'rev_comment',
2004                                 'ar_user'       => 'rev_user',
2005                                 'ar_user_text'  => 'rev_user_text',
2006                                 'ar_timestamp'  => 'rev_timestamp',
2007                                 'ar_minor_edit' => 'rev_minor_edit',
2008                                 'ar_rev_id'     => 'rev_id',
2009                                 'ar_parent_id'  => 'rev_parent_id',
2010                                 'ar_text_id'    => 'rev_text_id',
2011                                 'ar_text'       => '\'\'', // Be explicit to appease
2012                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2013                                 'ar_len'        => 'rev_len',
2014                                 'ar_page_id'    => 'page_id',
2015                                 'ar_deleted'    => $bitfield,
2016                                 'ar_sha1'       => 'rev_sha1'
2017                         ), array(
2018                                 'page_id' => $id,
2019                                 'page_id = rev_page'
2020                         ), __METHOD__
2021                 );
2022
2023                 # Now that it's safely backed up, delete it
2024                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2025                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2026
2027                 if ( !$ok ) {
2028                         $dbw->rollback( __METHOD__ );
2029                         return WikiPage::DELETE_NO_REVISIONS;
2030                 }
2031
2032                 $this->doDeleteUpdates( $id );
2033
2034                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2035                 $logtype = $suppress ? 'suppress' : 'delete';
2036
2037                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2038                 $logEntry->setPerformer( $user );
2039                 $logEntry->setTarget( $this->mTitle );
2040                 $logEntry->setComment( $reason );
2041                 $logid = $logEntry->insert();
2042                 $logEntry->publish( $logid );
2043
2044                 if ( $commit ) {
2045                         $dbw->commit( __METHOD__ );
2046                 }
2047
2048                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2049                 return WikiPage::DELETE_SUCCESS;
2050         }
2051
2052         /**
2053          * Do some database updates after deletion
2054          *
2055          * @param $id Int: page_id value of the page being deleted
2056          */
2057         public function doDeleteUpdates( $id ) {
2058                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2059
2060                 $dbw = wfGetDB( DB_MASTER );
2061
2062                 # Delete restrictions for it
2063                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2064
2065                 # Fix category table counts
2066                 $cats = array();
2067                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2068
2069                 foreach ( $res as $row ) {
2070                         $cats [] = $row->cl_to;
2071                 }
2072
2073                 $this->updateCategoryCounts( array(), $cats );
2074
2075                 # If using cascading deletes, we can skip some explicit deletes
2076                 if ( !$dbw->cascadingDeletes() ) {
2077                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2078
2079                         # Delete outgoing links
2080                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
2081                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
2082                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
2083                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
2084                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
2085                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
2086                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
2087                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
2088                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
2089                 }
2090
2091                 # If using cleanup triggers, we can skip some manual deletes
2092                 if ( !$dbw->cleanupTriggers() ) {
2093                         # Clean up recentchanges entries...
2094                         $dbw->delete( 'recentchanges',
2095                                 array( 'rc_type != ' . RC_LOG,
2096                                         'rc_namespace' => $this->mTitle->getNamespace(),
2097                                         'rc_title' => $this->mTitle->getDBkey() ),
2098                                 __METHOD__ );
2099                         $dbw->delete( 'recentchanges',
2100                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2101                                 __METHOD__ );
2102                 }
2103
2104                 # Clear caches
2105                 self::onArticleDelete( $this->mTitle );
2106
2107                 # Reset this object
2108                 $this->clear();
2109
2110                 # Clear the cached article id so the interface doesn't act like we exist
2111                 $this->mTitle->resetArticleID( 0 );
2112         }
2113
2114         /**
2115          * Roll back the most recent consecutive set of edits to a page
2116          * from the same user; fails if there are no eligible edits to
2117          * roll back to, e.g. user is the sole contributor. This function
2118          * performs permissions checks on $user, then calls commitRollback()
2119          * to do the dirty work
2120          *
2121          * @todo: seperate the business/permission stuff out from backend code
2122          *
2123          * @param $fromP String: Name of the user whose edits to rollback.
2124          * @param $summary String: Custom summary. Set to default summary if empty.
2125          * @param $token String: Rollback token.
2126          * @param $bot Boolean: If true, mark all reverted edits as bot.
2127          *
2128          * @param $resultDetails Array: contains result-specific array of additional values
2129          *    'alreadyrolled' : 'current' (rev)
2130          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2131          *
2132          * @param $user User The user performing the rollback
2133          * @return array of errors, each error formatted as
2134          *   array(messagekey, param1, param2, ...).
2135          * On success, the array is empty.  This array can also be passed to
2136          * OutputPage::showPermissionsErrorPage().
2137          */
2138         public function doRollback(
2139                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2140         ) {
2141                 $resultDetails = null;
2142
2143                 # Check permissions
2144                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2145                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2146                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2147
2148                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2149                         $errors[] = array( 'sessionfailure' );
2150                 }
2151
2152                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2153                         $errors[] = array( 'actionthrottledtext' );
2154                 }
2155
2156                 # If there were errors, bail out now
2157                 if ( !empty( $errors ) ) {
2158                         return $errors;
2159                 }
2160
2161                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2162         }
2163
2164         /**
2165          * Backend implementation of doRollback(), please refer there for parameter
2166          * and return value documentation
2167          *
2168          * NOTE: This function does NOT check ANY permissions, it just commits the
2169          * rollback to the DB. Therefore, you should only call this function direct-
2170          * ly if you want to use custom permissions checks. If you don't, use
2171          * doRollback() instead.
2172          * @param $fromP String: Name of the user whose edits to rollback.
2173          * @param $summary String: Custom summary. Set to default summary if empty.
2174          * @param $bot Boolean: If true, mark all reverted edits as bot.
2175          *
2176          * @param $resultDetails Array: contains result-specific array of additional values
2177          * @param $guser User The user performing the rollback
2178          * @return array
2179          */
2180         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2181                 global $wgUseRCPatrol, $wgContLang;
2182
2183                 $dbw = wfGetDB( DB_MASTER );
2184
2185                 if ( wfReadOnly() ) {
2186                         return array( array( 'readonlytext' ) );
2187                 }
2188
2189                 # Get the last editor
2190                 $current = $this->getRevision();
2191                 if ( is_null( $current ) ) {
2192                         # Something wrong... no page?
2193                         return array( array( 'notanarticle' ) );
2194                 }
2195
2196                 $from = str_replace( '_', ' ', $fromP );
2197                 # User name given should match up with the top revision.
2198                 # If the user was deleted then $from should be empty.
2199                 if ( $from != $current->getUserText() ) {
2200                         $resultDetails = array( 'current' => $current );
2201                         return array( array( 'alreadyrolled',
2202                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2203                                 htmlspecialchars( $fromP ),
2204                                 htmlspecialchars( $current->getUserText() )
2205                         ) );
2206                 }
2207
2208                 # Get the last edit not by this guy...
2209                 # Note: these may not be public values
2210                 $user = intval( $current->getRawUser() );
2211                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2212                 $s = $dbw->selectRow( 'revision',
2213                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2214                         array( 'rev_page' => $current->getPage(),
2215                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2216                         ), __METHOD__,
2217                         array( 'USE INDEX' => 'page_timestamp',
2218                                 'ORDER BY' => 'rev_timestamp DESC' )
2219                         );
2220                 if ( $s === false ) {
2221                         # No one else ever edited this page
2222                         return array( array( 'cantrollback' ) );
2223                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2224                         # Only admins can see this text
2225                         return array( array( 'notvisiblerev' ) );
2226                 }
2227
2228                 $set = array();
2229                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2230                         # Mark all reverted edits as bot
2231                         $set['rc_bot'] = 1;
2232                 }
2233
2234                 if ( $wgUseRCPatrol ) {
2235                         # Mark all reverted edits as patrolled
2236                         $set['rc_patrolled'] = 1;
2237                 }
2238
2239                 if ( count( $set ) ) {
2240                         $dbw->update( 'recentchanges', $set,
2241                                 array( /* WHERE */
2242                                         'rc_cur_id' => $current->getPage(),
2243                                         'rc_user_text' => $current->getUserText(),
2244                                         "rc_timestamp > '{$s->rev_timestamp}'",
2245                                 ), __METHOD__
2246                         );
2247                 }
2248
2249                 # Generate the edit summary if necessary
2250                 $target = Revision::newFromId( $s->rev_id );
2251                 if ( empty( $summary ) ) {
2252                         if ( $from == '' ) { // no public user name
2253                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2254                         } else {
2255                                 $summary = wfMsgForContent( 'revertpage' );
2256                         }
2257                 }
2258
2259                 # Allow the custom summary to use the same args as the default message
2260                 $args = array(
2261                         $target->getUserText(), $from, $s->rev_id,
2262                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2263                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2264                 );
2265                 $summary = wfMsgReplaceArgs( $summary, $args );
2266
2267                 # Save
2268                 $flags = EDIT_UPDATE;
2269
2270                 if ( $guser->isAllowed( 'minoredit' ) ) {
2271                         $flags |= EDIT_MINOR;
2272                 }
2273
2274                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2275                         $flags |= EDIT_FORCE_BOT;
2276                 }
2277
2278                 # Actually store the edit
2279                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId(), $guser );
2280                 if ( !empty( $status->value['revision'] ) ) {
2281                         $revId = $status->value['revision']->getId();
2282                 } else {
2283                         $revId = false;
2284                 }
2285
2286                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2287
2288                 $resultDetails = array(
2289                         'summary' => $summary,
2290                         'current' => $current,
2291                         'target'  => $target,
2292                         'newid'   => $revId
2293                 );
2294
2295                 return array();
2296         }
2297
2298         /**
2299          * The onArticle*() functions are supposed to be a kind of hooks
2300          * which should be called whenever any of the specified actions
2301          * are done.
2302          *
2303          * This is a good place to put code to clear caches, for instance.
2304          *
2305          * This is called on page move and undelete, as well as edit
2306          *
2307          * @param $title Title object
2308          */
2309         public static function onArticleCreate( $title ) {
2310                 # Update existence markers on article/talk tabs...
2311                 if ( $title->isTalkPage() ) {
2312                         $other = $title->getSubjectPage();
2313                 } else {
2314                         $other = $title->getTalkPage();
2315                 }
2316
2317                 $other->invalidateCache();
2318                 $other->purgeSquid();
2319
2320                 $title->touchLinks();
2321                 $title->purgeSquid();
2322                 $title->deleteTitleProtection();
2323         }
2324
2325         /**
2326          * Clears caches when article is deleted
2327          *
2328          * @param $title Title
2329          */
2330         public static function onArticleDelete( $title ) {
2331                 # Update existence markers on article/talk tabs...
2332                 if ( $title->isTalkPage() ) {
2333                         $other = $title->getSubjectPage();
2334                 } else {
2335                         $other = $title->getTalkPage();
2336                 }
2337
2338                 $other->invalidateCache();
2339                 $other->purgeSquid();
2340
2341                 $title->touchLinks();
2342                 $title->purgeSquid();
2343
2344                 # File cache
2345                 HTMLFileCache::clearFileCache( $title );
2346
2347                 # Messages
2348                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2349                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2350                 }
2351
2352                 # Images
2353                 if ( $title->getNamespace() == NS_FILE ) {
2354                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2355                         $update->doUpdate();
2356                 }
2357
2358                 # User talk pages
2359                 if ( $title->getNamespace() == NS_USER_TALK ) {
2360                         $user = User::newFromName( $title->getText(), false );
2361                         if ( $user ) {
2362                                 $user->setNewtalk( false );
2363                         }
2364                 }
2365
2366                 # Image redirects
2367                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2368         }
2369
2370         /**
2371          * Purge caches on page update etc
2372          *
2373          * @param $title Title object
2374          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2375          */
2376         public static function onArticleEdit( $title ) {
2377                 // Invalidate caches of articles which include this page
2378                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2379
2380
2381                 // Invalidate the caches of all pages which redirect here
2382                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2383
2384                 # Purge squid for this page only
2385                 $title->purgeSquid();
2386
2387                 # Clear file cache for this page only
2388                 HTMLFileCache::clearFileCache( $title );
2389         }
2390
2391         /**#@-*/
2392
2393         /**
2394          * Returns a list of hidden categories this page is a member of.
2395          * Uses the page_props and categorylinks tables.
2396          *
2397          * @return Array of Title objects
2398          */
2399         public function getHiddenCategories() {
2400                 $result = array();
2401                 $id = $this->mTitle->getArticleID();
2402
2403                 if ( $id == 0 ) {
2404                         return array();
2405                 }
2406
2407                 $dbr = wfGetDB( DB_SLAVE );
2408                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2409                         array( 'cl_to' ),
2410                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2411                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2412                         __METHOD__ );
2413
2414                 if ( $res !== false ) {
2415                         foreach ( $res as $row ) {
2416                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2417                         }
2418                 }
2419
2420                 return $result;
2421         }
2422
2423         /**
2424         * Return an applicable autosummary if one exists for the given edit.
2425         * @param $oldtext String: the previous text of the page.
2426         * @param $newtext String: The submitted text of the page.
2427         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2428         * @return string An appropriate autosummary, or an empty string.
2429         */
2430         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2431                 global $wgContLang;
2432
2433                 # Decide what kind of autosummary is needed.
2434
2435                 # Redirect autosummaries
2436                 $ot = Title::newFromRedirect( $oldtext );
2437                 $rt = Title::newFromRedirect( $newtext );
2438
2439                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2440                         $truncatedtext = $wgContLang->truncate(
2441                                 str_replace( "\n", ' ', $newtext ),
2442                                 max( 0, 250
2443                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2444                                         - strlen( $rt->getFullText() )
2445                                 ) );
2446                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2447                 }
2448
2449                 # New page autosummaries
2450                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2451                         # If they're making a new article, give its text, truncated, in the summary.
2452
2453                         $truncatedtext = $wgContLang->truncate(
2454                                 str_replace( "\n", ' ', $newtext ),
2455                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2456
2457                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2458                 }
2459
2460                 # Blanking autosummaries
2461                 if ( $oldtext != '' && $newtext == '' ) {
2462                         return wfMsgForContent( 'autosumm-blank' );
2463                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2464                         # Removing more than 90% of the article
2465
2466                         $truncatedtext = $wgContLang->truncate(
2467                                 $newtext,
2468                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2469
2470                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2471                 }
2472
2473                 # If we reach this point, there's no applicable autosummary for our case, so our
2474                 # autosummary is empty.
2475                 return '';
2476         }
2477
2478         /**
2479          * Auto-generates a deletion reason
2480          *
2481          * @param &$hasHistory Boolean: whether the page has a history
2482          * @return mixed String containing deletion reason or empty string, or boolean false
2483          *    if no revision occurred
2484          */
2485         public function getAutoDeleteReason( &$hasHistory ) {
2486                 global $wgContLang;
2487
2488                 // Get the last revision
2489                 $rev = $this->getRevision();
2490
2491                 if ( is_null( $rev ) ) {
2492                         return false;
2493                 }
2494
2495                 // Get the article's contents
2496                 $contents = $rev->getText();
2497                 $blank = false;
2498
2499                 // If the page is blank, use the text from the previous revision,
2500                 // which can only be blank if there's a move/import/protect dummy revision involved
2501                 if ( $contents == '' ) {
2502                         $prev = $rev->getPrevious();
2503
2504                         if ( $prev )    {
2505                                 $contents = $prev->getText();
2506                                 $blank = true;
2507                         }
2508                 }
2509
2510                 $dbw = wfGetDB( DB_MASTER );
2511
2512                 // Find out if there was only one contributor
2513                 // Only scan the last 20 revisions
2514                 $res = $dbw->select( 'revision', 'rev_user_text',
2515                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2516                         __METHOD__,
2517                         array( 'LIMIT' => 20 )
2518                 );
2519
2520                 if ( $res === false ) {
2521                         // This page has no revisions, which is very weird
2522                         return false;
2523                 }
2524
2525                 $hasHistory = ( $res->numRows() > 1 );
2526                 $row = $dbw->fetchObject( $res );
2527
2528                 if ( $row ) { // $row is false if the only contributor is hidden
2529                         $onlyAuthor = $row->rev_user_text;
2530                         // Try to find a second contributor
2531                         foreach ( $res as $row ) {
2532                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2533                                         $onlyAuthor = false;
2534                                         break;
2535                                 }
2536                         }
2537                 } else {
2538                         $onlyAuthor = false;
2539                 }
2540
2541                 // Generate the summary with a '$1' placeholder
2542                 if ( $blank ) {
2543                         // The current revision is blank and the one before is also
2544                         // blank. It's just not our lucky day
2545                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2546                 } else {
2547                         if ( $onlyAuthor ) {
2548                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2549                         } else {
2550                                 $reason = wfMsgForContent( 'excontent', '$1' );
2551                         }
2552                 }
2553
2554                 if ( $reason == '-' ) {
2555                         // Allow these UI messages to be blanked out cleanly
2556                         return '';
2557                 }
2558
2559                 // Replace newlines with spaces to prevent uglyness
2560                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2561                 // Calculate the maximum amount of chars to get
2562                 // Max content length = max comment length - length of the comment (excl. $1)
2563                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2564                 $contents = $wgContLang->truncate( $contents, $maxLength );
2565                 // Remove possible unfinished links
2566                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2567                 // Now replace the '$1' placeholder
2568                 $reason = str_replace( '$1', $contents, $reason );
2569
2570                 return $reason;
2571         }
2572
2573         /**
2574          * Update all the appropriate counts in the category table, given that
2575          * we've added the categories $added and deleted the categories $deleted.
2576          *
2577          * @param $added array   The names of categories that were added
2578          * @param $deleted array The names of categories that were deleted
2579          */
2580         public function updateCategoryCounts( $added, $deleted ) {
2581                 $ns = $this->mTitle->getNamespace();
2582                 $dbw = wfGetDB( DB_MASTER );
2583
2584                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2585                 # exist, we might legitimately not create it, but it's simpler to just
2586                 # create it and then give it a negative value, since the value is bogus
2587                 # anyway.
2588                 #
2589                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2590                 $insertCats = array_merge( $added, $deleted );
2591                 if ( !$insertCats ) {
2592                         # Okay, nothing to do
2593                         return;
2594                 }
2595
2596                 $insertRows = array();
2597
2598                 foreach ( $insertCats as $cat ) {
2599                         $insertRows[] = array(
2600                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2601                                 'cat_title' => $cat
2602                         );
2603                 }
2604                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2605
2606                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2607                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2608
2609                 if ( $ns == NS_CATEGORY ) {
2610                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2611                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2612                 } elseif ( $ns == NS_FILE ) {
2613                         $addFields[]    = 'cat_files = cat_files + 1';
2614                         $removeFields[] = 'cat_files = cat_files - 1';
2615                 }
2616
2617                 if ( $added ) {
2618                         $dbw->update(
2619                                 'category',
2620                                 $addFields,
2621                                 array( 'cat_title' => $added ),
2622                                 __METHOD__
2623                         );
2624                 }
2625
2626                 if ( $deleted ) {
2627                         $dbw->update(
2628                                 'category',
2629                                 $removeFields,
2630                                 array( 'cat_title' => $deleted ),
2631                                 __METHOD__
2632                         );
2633                 }
2634         }
2635
2636         /**
2637          * Updates cascading protections
2638          *
2639          * @param $parserOutput ParserOutput object for the current version
2640          */
2641         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2642                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2643                         return;
2644                 }
2645
2646                 // templatelinks table may have become out of sync,
2647                 // especially if using variable-based transclusions.
2648                 // For paranoia, check if things have changed and if
2649                 // so apply updates to the database. This will ensure
2650                 // that cascaded protections apply as soon as the changes
2651                 // are visible.
2652
2653                 # Get templates from templatelinks
2654                 $id = $this->mTitle->getArticleID();
2655
2656                 $tlTemplates = array();
2657
2658                 $dbr = wfGetDB( DB_SLAVE );
2659                 $res = $dbr->select( array( 'templatelinks' ),
2660                         array( 'tl_namespace', 'tl_title' ),
2661                         array( 'tl_from' => $id ),
2662                         __METHOD__
2663                 );
2664
2665                 foreach ( $res as $row ) {
2666                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2667                 }
2668
2669                 # Get templates from parser output.
2670                 $poTemplates = array();
2671                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2672                         foreach ( $templates as $dbk => $id ) {
2673                                 $poTemplates["$ns:$dbk"] = true;
2674                         }
2675                 }
2676
2677                 # Get the diff
2678                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2679
2680                 if ( count( $templates_diff ) > 0 ) {
2681                         # Whee, link updates time.
2682                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2683                         $u->doUpdate();
2684                 }
2685         }
2686
2687         /**
2688          * Return a list of templates used by this article.
2689          * Uses the templatelinks table
2690          *
2691          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2692          * @return Array of Title objects
2693          */
2694         public function getUsedTemplates() {
2695                 return $this->mTitle->getTemplateLinksFrom();
2696         }
2697
2698         /**
2699          * Perform article updates on a special page creation.
2700          *
2701          * @param $rev Revision object
2702          *
2703          * @todo This is a shitty interface function. Kill it and replace the
2704          * other shitty functions like doEditUpdates and such so it's not needed
2705          * anymore.
2706          * @deprecated since 1.18, use doEditUpdates()
2707          */
2708         public function createUpdates( $rev ) {
2709                 wfDeprecated( __METHOD__, '1.18' );
2710                 global $wgUser;
2711                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2712         }
2713
2714         /**
2715          * This function is called right before saving the wikitext,
2716          * so we can do things like signatures and links-in-context.
2717          *
2718          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2719          * @param $text String article contents
2720          * @param $user User object: user doing the edit
2721          * @param $popts ParserOptions object: parser options, default options for
2722          *               the user loaded if null given
2723          * @return string article contents with altered wikitext markup (signatures
2724          *      converted, {{subst:}}, templates, etc.)
2725          */
2726         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2727                 global $wgParser, $wgUser;
2728
2729                 wfDeprecated( __METHOD__, '1.19' );
2730
2731                 $user = is_null( $user ) ? $wgUser : $user;
2732
2733                 if ( $popts === null ) {
2734                         $popts = ParserOptions::newFromUser( $user );
2735                 }
2736
2737                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2738         }
2739
2740         /**
2741          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2742          *
2743          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2744          * @return bool
2745          */
2746         public function isBigDeletion() {
2747                 wfDeprecated( __METHOD__, '1.19' );
2748                 return $this->mTitle->isBigDeletion();
2749         }
2750
2751         /**
2752          * Get the  approximate revision count of this page.
2753          *
2754          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2755          * @return int
2756          */
2757         public function estimateRevisionCount() {
2758                 wfDeprecated( __METHOD__, '1.19' );
2759                 return $this->mTitle->estimateRevisionCount();
2760         }
2761
2762         /**
2763          * Update the article's restriction field, and leave a log entry.
2764          *
2765          * @deprecated since 1.19
2766          * @param $limit Array: set of restriction keys
2767          * @param $reason String
2768          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2769          * @param $expiry Array: per restriction type expiration
2770          * @param $user User The user updating the restrictions
2771          * @return bool true on success
2772          */
2773         public function updateRestrictions(
2774                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2775         ) {
2776                 global $wgUser;
2777
2778                 $user = is_null( $user ) ? $wgUser : $user;
2779
2780                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2781         }
2782
2783         /**
2784          * @deprecated since 1.18
2785          */
2786         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2787                 wfDeprecated( __METHOD__, '1.18' );
2788                 global $wgUser;
2789                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2790         }
2791
2792         /**
2793          * @deprecated since 1.18
2794          */
2795         public function viewUpdates() {
2796                 wfDeprecated( __METHOD__, '1.18' );
2797                 global $wgUser;
2798                 return $this->doViewUpdates( $wgUser );
2799         }
2800
2801         /**
2802          * @deprecated since 1.18
2803          * @return bool
2804          */
2805         public function useParserCache( $oldid ) {
2806                 wfDeprecated( __METHOD__, '1.18' );
2807                 global $wgUser;
2808                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2809         }
2810 }
2811
2812 class PoolWorkArticleView extends PoolCounterWork {
2813
2814         /**
2815          * @var Page
2816          */
2817         private $page;
2818
2819         /**
2820          * @var string
2821          */
2822         private $cacheKey;
2823
2824         /**
2825          * @var integer
2826          */
2827         private $revid;
2828
2829         /**
2830          * @var ParserOptions
2831          */
2832         private $parserOptions;
2833
2834         /**
2835          * @var string|null
2836          */
2837         private $text;
2838
2839         /**
2840          * @var ParserOutput|bool
2841          */
2842         private $parserOutput = false;
2843
2844         /**
2845          * @var bool
2846          */
2847         private $isDirty = false;
2848
2849         /**
2850          * @var Status|bool
2851          */
2852         private $error = false;
2853
2854         /**
2855          * Constructor
2856          *
2857          * @param $page Page
2858          * @param $revid Integer: ID of the revision being parsed
2859          * @param $useParserCache Boolean: whether to use the parser cache
2860          * @param $parserOptions parserOptions to use for the parse operation
2861          * @param $text String: text to parse or null to load it
2862          */
2863         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $text = null ) {
2864                 $this->page = $page;
2865                 $this->revid = $revid;
2866                 $this->cacheable = $useParserCache;
2867                 $this->parserOptions = $parserOptions;
2868                 $this->text = $text;
2869                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
2870                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
2871         }
2872
2873         /**
2874          * Get the ParserOutput from this object, or false in case of failure
2875          *
2876          * @return ParserOutput
2877          */
2878         public function getParserOutput() {
2879                 return $this->parserOutput;
2880         }
2881
2882         /**
2883          * Get whether the ParserOutput is a dirty one (i.e. expired)
2884          *
2885          * @return bool
2886          */
2887         public function getIsDirty() {
2888                 return $this->isDirty;
2889         }
2890
2891         /**
2892          * Get a Status object in case of error or false otherwise
2893          *
2894          * @return Status|bool
2895          */
2896         public function getError() {
2897                 return $this->error;
2898         }
2899
2900         /**
2901          * @return bool
2902          */
2903         function doWork() {
2904                 global $wgParser, $wgUseFileCache;
2905
2906                 $isCurrent = $this->revid === $this->page->getLatest();
2907
2908                 if ( $this->text !== null ) {
2909                         $text = $this->text;
2910                 } elseif ( $isCurrent ) {
2911                         $text = $this->page->getRawText();
2912                 } else {
2913                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
2914                         if ( $rev === null ) {
2915                                 return false;
2916                         }
2917                         $text = $rev->getText();
2918                 }
2919
2920                 $time = - microtime( true );
2921                 $this->parserOutput = $wgParser->parse( $text, $this->page->getTitle(),
2922                         $this->parserOptions, true, true, $this->revid );
2923                 $time += microtime( true );
2924
2925                 # Timing hack
2926                 if ( $time > 3 ) {
2927                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
2928                                 $this->page->getTitle()->getPrefixedDBkey() ) );
2929                 }
2930
2931                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
2932                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
2933                 }
2934
2935                 // Make sure file cache is not used on uncacheable content.
2936                 // Output that has magic words in it can still use the parser cache
2937                 // (if enabled), though it will generally expire sooner.
2938                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
2939                         $wgUseFileCache = false;
2940                 }
2941
2942                 if ( $isCurrent ) {
2943                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
2944                 }
2945
2946                 return true;
2947         }
2948
2949         /**
2950          * @return bool
2951          */
2952         function getCachedWork() {
2953                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
2954
2955                 if ( $this->parserOutput === false ) {
2956                         wfDebug( __METHOD__ . ": parser cache miss\n" );
2957                         return false;
2958                 } else {
2959                         wfDebug( __METHOD__ . ": parser cache hit\n" );
2960                         return true;
2961                 }
2962         }
2963
2964         /**
2965          * @return bool
2966          */
2967         function fallback() {
2968                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
2969
2970                 if ( $this->parserOutput === false ) {
2971                         wfDebugLog( 'dirty', "dirty missing\n" );
2972                         wfDebug( __METHOD__ . ": no dirty cache\n" );
2973                         return false;
2974                 } else {
2975                         wfDebug( __METHOD__ . ": sending dirty output\n" );
2976                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
2977                         $this->isDirty = true;
2978                         return true;
2979                 }
2980         }
2981
2982         /**
2983          * @param $status Status
2984          * @return bool
2985          */
2986         function error( $status ) {
2987                 $this->error = $status;
2988                 return false;
2989         }
2990 }