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