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         /**
  17          * @var Title
  18          * @protected
  19          */
  20         public $mTitle = null;
  21
  22         /**@{{
  23          * @protected
  24          */
  25         public $mCounter = -1;               // !< Integer (-1 means "not loaded")
  26         public $mDataLoaded = false;         // !< Boolean
  27         public $mIsRedirect = false;         // !< Boolean
  28         public $mLatest = false;             // !< Boolean
  29         public $mPreparedEdit = false;           // !< Array
  30         public $mRedirectTarget = null;          // !< Title object
  31         public $mLastRevision = null;            // !< Revision object
  32         public $mTimestamp = '';             // !< String
  33         public $mTouched = '19700101000000'; // !< String
  34         /**@}}*/
  35
  36         /**
  37          * @protected
  38          * @var ParserOptions: ParserOptions object for $wgUser articles
  39          */
  40         public $mParserOptions;
  41
  42         /**
  43          * Constructor and clear the article
  44          * @param $title Title Reference to a Title object.
  45          */
  46         public function __construct( Title $title ) {
  47                 $this->mTitle = $title;
  48         }
  49
  50         /**
  51          * Create a WikiPage object of the appropriate class for the given title.
  52          *
  53          * @param $title Title
  54          * @return WikiPage object of the appropriate type
  55          */
  56         public static function factory( Title $title ) {
  57                 $ns = $title->getNamespace();
  58
  59                 if ( $ns == NS_MEDIA ) {
  60                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  61                 } elseif ( $ns < 0 ) {
  62                         throw new MWException( "Invalid or virtual namespace $ns given." );
  63                 }
  64
  65                 switch ( $ns ) {
  66                         case NS_FILE:
  67                                 $page = new WikiFilePage( $title );
  68                                 break;
  69                         case NS_CATEGORY:
  70                                 $page = new WikiCategoryPage( $title );
  71                                 break;
  72                         default:
  73                                 $page = new WikiPage( $title );
  74                 }
  75
  76                 return $page;
  77         }
  78
  79         /**
  80          * Constructor from a page id
  81          *
  82          * Always override this for all subclasses (until we use PHP with LSB)
  83          *
  84          * @param $id Int article ID to load
  85          *
  86          * @return WikiPage
  87          */
  88         public static function newFromID( $id ) {
  89                 $t = Title::newFromID( $id );
  90                 # @todo FIXME: Doesn't inherit right
  91                 return $t == null ? null : new self( $t );
  92                 # return $t == null ? null : new static( $t ); // PHP 5.3
  93         }
  94
  95         /**
  96          * Returns overrides for action handlers.
  97          * Classes listed here will be used instead of the default one when
  98          * (and only when) $wgActions[$action] === true. This allows subclasses
  99          * to override the default behavior.
 100          *
 101          * @return Array
 102          */
 103         public function getActionOverrides() {
 104                 return array();
 105         }
 106
 107         /**
 108          * If this page is a redirect, get its target
 109          *
 110          * The target will be fetched from the redirect table if possible.
 111          * If this page doesn't have an entry there, call insertRedirect()
 112          * @return Title|mixed object, or null if this page is not a redirect
 113          */
 114         public function getRedirectTarget() {
 115                 if ( !$this->mTitle->isRedirect() ) {
 116                         return null;
 117                 }
 118
 119                 if ( $this->mRedirectTarget !== null ) {
 120                         return $this->mRedirectTarget;
 121                 }
 122
 123                 # Query the redirect table
 124                 $dbr = wfGetDB( DB_SLAVE );
 125                 $row = $dbr->selectRow( 'redirect',
 126                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 127                         array( 'rd_from' => $this->getId() ),
 128                         __METHOD__
 129                 );
 130
 131                 // rd_fragment and rd_interwiki were added later, populate them if empty
 132                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 133                         return $this->mRedirectTarget = Title::makeTitle(
 134                                 $row->rd_namespace, $row->rd_title,
 135                                 $row->rd_fragment, $row->rd_interwiki );
 136                 }
 137
 138                 # This page doesn't have an entry in the redirect table
 139                 return $this->mRedirectTarget = $this->insertRedirect();
 140         }
 141
 142         /**
 143          * Insert an entry for this page into the redirect table.
 144          *
 145          * Don't call this function directly unless you know what you're doing.
 146          * @return Title object or null if not a redirect
 147          */
 148         public function insertRedirect() {
 149                 // recurse through to only get the final target
 150                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 151                 if ( !$retval ) {
 152                         return null;
 153                 }
 154                 $this->insertRedirectEntry( $retval );
 155                 return $retval;
 156         }
 157
 158         /**
 159          * Insert or update the redirect table entry for this page to indicate
 160          * it redirects to $rt .
 161          * @param $rt Title redirect target
 162          */
 163         public function insertRedirectEntry( $rt ) {
 164                 $dbw = wfGetDB( DB_MASTER );
 165                 $dbw->replace( 'redirect', array( 'rd_from' ),
 166                         array(
 167                                 'rd_from'      => $this->getId(),
 168                                 'rd_namespace' => $rt->getNamespace(),
 169                                 'rd_title'     => $rt->getDBkey(),
 170                                 'rd_fragment'  => $rt->getFragment(),
 171                                 'rd_interwiki' => $rt->getInterwiki(),
 172                         ),
 173                         __METHOD__
 174                 );
 175         }
 176
 177         /**
 178          * Get the Title object or URL this page redirects to
 179          *
 180          * @return mixed false, Title of in-wiki target, or string with URL
 181          */
 182         public function followRedirect() {
 183                 return $this->getRedirectURL( $this->getRedirectTarget() );
 184         }
 185
 186         /**
 187          * Get the Title object or URL to use for a redirect. We use Title
 188          * objects for same-wiki, non-special redirects and URLs for everything
 189          * else.
 190          * @param $rt Title Redirect target
 191          * @return mixed false, Title object of local target, or string with URL
 192          */
 193         public function getRedirectURL( $rt ) {
 194                 if ( $rt ) {
 195                         if ( $rt->getInterwiki() != '' ) {
 196                                 if ( $rt->isLocal() ) {
 197                                         // Offsite wikis need an HTTP redirect.
 198                                         //
 199                                         // This can be hard to reverse and may produce loops,
 200                                         // so they may be disabled in the site configuration.
 201                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 202                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 203                                 }
 204                         } else {
 205                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 206                                         // Gotta handle redirects to special pages differently:
 207                                         // Fill the HTTP response "Location" header and ignore
 208                                         // the rest of the page we're on.
 209                                         //
 210                                         // This can be hard to reverse, so they may be disabled.
 211                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 212                                                 // rolleyes
 213                                         } else {
 214                                                 return $rt->getFullURL();
 215                                         }
 216                                 }
 217
 218                                 return $rt;
 219                         }
 220                 }
 221
 222                 // No or invalid redirect
 223                 return false;
 224         }
 225
 226         /**
 227          * Get the title object of the article
 228          * @return Title object of this page
 229          */
 230         public function getTitle() {
 231                 return $this->mTitle;
 232         }
 233
 234         /**
 235          * Clear the object
 236          */
 237         public function clear() {
 238                 $this->mDataLoaded = false;
 239
 240                 $this->mCounter = -1; # Not loaded
 241                 $this->mRedirectTarget = null; # Title object if set
 242                 $this->mLastRevision = null; # Latest revision
 243                 $this->mTimestamp = '';
 244                 $this->mTouched = '19700101000000';
 245                 $this->mIsRedirect = false;
 246                 $this->mLatest = false;
 247                 $this->mPreparedEdit = false;
 248         }
 249
 250         /**
 251          * Get the text that needs to be saved in order to undo all revisions
 252          * between $undo and $undoafter. Revisions must belong to the same page,
 253          * must exist and must not be deleted
 254          * @param $undo Revision
 255          * @param $undoafter Revision Must be an earlier revision than $undo
 256          * @return mixed string on success, false on failure
 257          */
 258         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 259                 $cur_text = $this->getRawText();
 260                 if ( $cur_text === false ) {
 261                         return false; // no page
 262                 }
 263                 $undo_text = $undo->getText();
 264                 $undoafter_text = $undoafter->getText();
 265
 266                 if ( $cur_text == $undo_text ) {
 267                         # No use doing a merge if it's just a straight revert.
 268                         return $undoafter_text;
 269                 }
 270
 271                 $undone_text = '';
 272
 273                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 274                         return false;
 275                 }
 276
 277                 return $undone_text;
 278         }
 279
 280         /**
 281          * Return the list of revision fields that should be selected to create
 282          * a new page.
 283          *
 284          * @return array
 285          */
 286         public static function selectFields() {
 287                 return array(
 288                         'page_id',
 289                         'page_namespace',
 290                         'page_title',
 291                         'page_restrictions',
 292                         'page_counter',
 293                         'page_is_redirect',
 294                         'page_is_new',
 295                         'page_random',
 296                         'page_touched',
 297                         'page_latest',
 298                         'page_len',
 299                 );
 300         }
 301
 302         /**
 303          * Fetch a page record with the given conditions
 304          * @param $dbr DatabaseBase object
 305          * @param $conditions Array
 306          * @return mixed Database result resource, or false on failure
 307          */
 308         protected function pageData( $dbr, $conditions ) {
 309                 $fields = self::selectFields();
 310
 311                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 312
 313                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 314
 315                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 316
 317                 return $row;
 318         }
 319
 320         /**
 321          * Fetch a page record matching the Title object's namespace and title
 322          * using a sanitized title string
 323          *
 324          * @param $dbr DatabaseBase object
 325          * @param $title Title object
 326          * @return mixed Database result resource, or false on failure
 327          */
 328         public function pageDataFromTitle( $dbr, $title ) {
 329                 return $this->pageData( $dbr, array(
 330                         'page_namespace' => $title->getNamespace(),
 331                         'page_title'     => $title->getDBkey() ) );
 332         }
 333
 334         /**
 335          * Fetch a page record matching the requested ID
 336          *
 337          * @param $dbr DatabaseBase
 338          * @param $id Integer
 339          * @return mixed Database result resource, or false on failure
 340          */
 341         public function pageDataFromId( $dbr, $id ) {
 342                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 343         }
 344
 345         /**
 346          * Set the general counter, title etc data loaded from
 347          * some source.
 348          *
 349          * @param $data Object|String One of the following:
 350          *              A DB query result object or...
 351          *              "fromdb" to get from a slave DB or...
 352          *              "fromdbmaster" to get from the master DB
 353          * @return void
 354          */
 355         public function loadPageData( $data = 'fromdb' ) {
 356                 if ( $data === 'fromdbmaster' ) {
 357                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 358                 } elseif ( $data === 'fromdb' ) { // slave
 359                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 360                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 361                         # Note that DB also stores the master position in the session and checks it.
 362                         $touched = $this->getCachedLastEditTime();
 363                         if ( $touched ) { // key set
 364                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 365                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 366                                 }
 367                         }
 368                 }
 369
 370                 $lc = LinkCache::singleton();
 371
 372                 if ( $data ) {
 373                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle,
 374                                 $data->page_len, $data->page_is_redirect, $data->page_latest );
 375
 376                         $this->mTitle->loadFromRow( $data );
 377
 378                         # Old-fashioned restrictions
 379                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 380
 381                         $this->mCounter     = intval( $data->page_counter );
 382                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 383                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 384                         $this->mLatest      = intval( $data->page_latest );
 385                 } else {
 386                         $lc->addBadLinkObj( $this->mTitle );
 387
 388                         $this->mTitle->loadFromRow( false );
 389                 }
 390
 391                 $this->mDataLoaded = true;
 392         }
 393
 394         /**
 395          * @return int Page ID
 396          */
 397         public function getId() {
 398                 return $this->mTitle->getArticleID();
 399         }
 400
 401         /**
 402          * @return bool Whether or not the page exists in the database
 403          */
 404         public function exists() {
 405                 return $this->getId() > 0;
 406         }
 407
 408         /**
 409          * Check if this page is something we're going to be showing
 410          * some sort of sensible content for. If we return false, page
 411          * views (plain action=view) will return an HTTP 404 response,
 412          * so spiders and robots can know they're following a bad link.
 413          *
 414          * @return bool
 415          */
 416         public function hasViewableContent() {
 417                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 418         }
 419
 420         /**
 421          * @return int The view count for the page
 422          */
 423         public function getCount() {
 424                 if ( -1 == $this->mCounter ) {
 425                         $id = $this->getId();
 426
 427                         if ( $id == 0 ) {
 428                                 $this->mCounter = 0;
 429                         } else {
 430                                 $dbr = wfGetDB( DB_SLAVE );
 431                                 $this->mCounter = $dbr->selectField( 'page',
 432                                         'page_counter',
 433                                         array( 'page_id' => $id ),
 434                                         __METHOD__
 435                                 );
 436                         }
 437                 }
 438
 439                 return $this->mCounter;
 440         }
 441
 442         /**
 443          * Determine whether a page would be suitable for being counted as an
 444          * article in the site_stats table based on the title & its content
 445          *
 446          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 447          *        if false, the current database state will be used
 448          * @return Boolean
 449          */
 450         public function isCountable( $editInfo = false ) {
 451                 global $wgArticleCountMethod;
 452
 453                 if ( !$this->mTitle->isContentPage() ) {
 454                         return false;
 455                 }
 456
 457                 $text = $editInfo ? $editInfo->pst : false;
 458
 459                 if ( $this->isRedirect( $text ) ) {
 460                         return false;
 461                 }
 462
 463                 switch ( $wgArticleCountMethod ) {
 464                 case 'any':
 465                         return true;
 466                 case 'comma':
 467                         if ( $text === false ) {
 468                                 $text = $this->getRawText();
 469                         }
 470                         return strpos( $text,  ',' ) !== false;
 471                 case 'link':
 472                         if ( $editInfo ) {
 473                                 // ParserOutput::getLinks() is a 2D array of page links, so
 474                                 // to be really correct we would need to recurse in the array
 475                                 // but the main array should only have items in it if there are
 476                                 // links.
 477                                 return (bool)count( $editInfo->output->getLinks() );
 478                         } else {
 479                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 480                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 481                         }
 482                 }
 483         }
 484
 485         /**
 486          * Tests if the article text represents a redirect
 487          *
 488          * @param $text mixed string containing article contents, or boolean
 489          * @return bool
 490          */
 491         public function isRedirect( $text = false ) {
 492                 if ( $text === false ) {
 493                         if ( !$this->mDataLoaded ) {
 494                                 $this->loadPageData();
 495                         }
 496
 497                         return (bool)$this->mIsRedirect;
 498                 } else {
 499                         return Title::newFromRedirect( $text ) !== null;
 500                 }
 501         }
 502
 503         /**
 504          * Loads everything except the text
 505          * This isn't necessary for all uses, so it's only done if needed.
 506          */
 507         protected function loadLastEdit() {
 508                 if ( $this->mLastRevision !== null ) {
 509                         return; // already loaded
 510                 }
 511
 512                 $latest = $this->getLatest();
 513                 if ( !$latest ) {
 514                         return; // page doesn't exist or is missing page_latest info
 515                 }
 516
 517                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 518                 if ( $revision ) { // sanity
 519                         $this->setLastEdit( $revision );
 520                 }
 521         }
 522
 523         /**
 524          * Set the latest revision
 525          */
 526         protected function setLastEdit( Revision $revision ) {
 527                 $this->mLastRevision = $revision;
 528                 $this->mTimestamp = $revision->getTimestamp();
 529         }
 530
 531         /**
 532          * Get the latest revision
 533          * @return Revision|null
 534          */
 535         public function getRevision() {
 536                 $this->loadLastEdit();
 537                 if ( $this->mLastRevision ) {
 538                         return $this->mLastRevision;
 539                 }
 540                 return null;
 541         }
 542
 543         /**
 544          * Get the text of the current revision. No side-effects...
 545          *
 546          * @param $audience Integer: one of:
 547          *      Revision::FOR_PUBLIC       to be displayed to all users
 548          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 549          *      Revision::RAW              get the text regardless of permissions
 550          * @return String|false The text of the current revision
 551          */
 552         public function getText( $audience = Revision::FOR_PUBLIC ) {
 553                 $this->loadLastEdit();
 554                 if ( $this->mLastRevision ) {
 555                         return $this->mLastRevision->getText( $audience );
 556                 }
 557                 return false;
 558         }
 559
 560         /**
 561          * Get the text of the current revision. No side-effects...
 562          *
 563          * @return String|false The text of the current revision
 564          */
 565         public function getRawText() {
 566                 $this->loadLastEdit();
 567                 if ( $this->mLastRevision ) {
 568                         return $this->mLastRevision->getRawText();
 569                 }
 570                 return false;
 571         }
 572
 573         /**
 574          * @return string MW timestamp of last article revision
 575          */
 576         public function getTimestamp() {
 577                 // Check if the field has been filled by WikiPage::setTimestamp()
 578                 if ( !$this->mTimestamp ) {
 579                         $this->loadLastEdit();
 580                 }
 581                 return wfTimestamp( TS_MW, $this->mTimestamp );
 582         }
 583
 584         /**
 585          * Set the page timestamp (use only to avoid DB queries)
 586          * @param $ts string MW timestamp of last article revision
 587          * @return void
 588          */
 589         public function setTimestamp( $ts ) {
 590                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 591         }
 592
 593         /**
 594          * @param $audience Integer: one of:
 595          *      Revision::FOR_PUBLIC       to be displayed to all users
 596          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 597          *      Revision::RAW              get the text regardless of permissions
 598          * @return int user ID for the user that made the last article revision
 599          */
 600         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 601                 $this->loadLastEdit();
 602                 if ( $this->mLastRevision ) {
 603                         return $this->mLastRevision->getUser( $audience );
 604                 } else {
 605                         return -1;
 606                 }
 607         }
 608
 609         /**
 610          * @param $audience Integer: one of:
 611          *      Revision::FOR_PUBLIC       to be displayed to all users
 612          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 613          *      Revision::RAW              get the text regardless of permissions
 614          * @return string username of the user that made the last article revision
 615          */
 616         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 617                 $this->loadLastEdit();
 618                 if ( $this->mLastRevision ) {
 619                         return $this->mLastRevision->getUserText( $audience );
 620                 } else {
 621                         return '';
 622                 }
 623         }
 624
 625         /**
 626          * @param $audience Integer: one of:
 627          *      Revision::FOR_PUBLIC       to be displayed to all users
 628          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 629          *      Revision::RAW              get the text regardless of permissions
 630          * @return string Comment stored for the last article revision
 631          */
 632         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 633                 $this->loadLastEdit();
 634                 if ( $this->mLastRevision ) {
 635                         return $this->mLastRevision->getComment( $audience );
 636                 } else {
 637                         return '';
 638                 }
 639         }
 640
 641         /**
 642          * Returns true if last revision was marked as "minor edit"
 643          *
 644          * @return boolean Minor edit indicator for the last article revision.
 645          */
 646         public function getMinorEdit() {
 647                 $this->loadLastEdit();
 648                 if ( $this->mLastRevision ) {
 649                         return $this->mLastRevision->isMinor();
 650                 } else {
 651                         return false;
 652                 }
 653         }
 654
 655         /**
 656          * Get a list of users who have edited this article, not including the user who made
 657          * the most recent revision, which you can get from $article->getUser() if you want it
 658          * @return UserArrayFromResult
 659          */
 660         public function getContributors() {
 661                 # @todo FIXME: This is expensive; cache this info somewhere.
 662
 663                 $dbr = wfGetDB( DB_SLAVE );
 664
 665                 if ( $dbr->implicitGroupby() ) {
 666                         $realNameField = 'user_real_name';
 667                 } else {
 668                         $realNameField = 'FIRST(user_real_name) AS user_real_name';
 669                 }
 670
 671                 $tables = array( 'revision', 'user' );
 672
 673                 $fields = array(
 674                         'rev_user as user_id',
 675                         'rev_user_text AS user_name',
 676                         $realNameField,
 677                         'MAX(rev_timestamp) AS timestamp',
 678                 );
 679
 680                 $conds = array( 'rev_page' => $this->getId() );
 681
 682                 // The user who made the top revision gets credited as "this page was last edited by
 683                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 684                 $user = $this->getUser();
 685                 if ( $user ) {
 686                         $conds[] = "rev_user != $user";
 687                 } else {
 688                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 689                 }
 690
 691                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 692
 693                 $jconds = array(
 694                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 695                 );
 696
 697                 $options = array(
 698                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 699                         'ORDER BY' => 'timestamp DESC',
 700                 );
 701
 702                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 703                 return new UserArrayFromResult( $res );
 704         }
 705
 706         /**
 707          * Should the parser cache be used?
 708          *
 709          * @param $user User The relevant user
 710          * @return boolean
 711          */
 712         public function isParserCacheUsed( User $user, $oldid ) {
 713                 global $wgEnableParserCache;
 714
 715                 return $wgEnableParserCache
 716                         && $user->getStubThreshold() == 0
 717                         && $this->exists()
 718                         && empty( $oldid )
 719                         && $this->mTitle->isWikitextPage();
 720         }
 721
 722         /**
 723          * Perform the actions of a page purging
 724          */
 725         public function doPurge() {
 726                 global $wgUseSquid;
 727
 728                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 729                         return false;
 730                 }
 731
 732                 // Invalidate the cache
 733                 $this->mTitle->invalidateCache();
 734                 $this->clear();
 735
 736                 if ( $wgUseSquid ) {
 737                         // Commit the transaction before the purge is sent
 738                         $dbw = wfGetDB( DB_MASTER );
 739                         $dbw->commit();
 740
 741                         // Send purge
 742                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 743                         $update->doUpdate();
 744                 }
 745
 746                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 747                         if ( $this->getId() == 0 ) {
 748                                 $text = false;
 749                         } else {
 750                                 $text = $this->getRawText();
 751                         }
 752
 753                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 754                 }
 755         }
 756
 757         /**
 758          * Insert a new empty page record for this article.
 759          * This *must* be followed up by creating a revision
 760          * and running $this->updateRevisionOn( ... );
 761          * or else the record will be left in a funky state.
 762          * Best if all done inside a transaction.
 763          *
 764          * @param $dbw DatabaseBase
 765          * @return int The newly created page_id key, or false if the title already existed
 766          * @private
 767          */
 768         public function insertOn( $dbw ) {
 769                 wfProfileIn( __METHOD__ );
 770
 771                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 772                 $dbw->insert( 'page', array(
 773                         'page_id'           => $page_id,
 774                         'page_namespace'    => $this->mTitle->getNamespace(),
 775                         'page_title'        => $this->mTitle->getDBkey(),
 776                         'page_counter'      => 0,
 777                         'page_restrictions' => '',
 778                         'page_is_redirect'  => 0, # Will set this shortly...
 779                         'page_is_new'       => 1,
 780                         'page_random'       => wfRandom(),
 781                         'page_touched'      => $dbw->timestamp(),
 782                         'page_latest'       => 0, # Fill this in shortly...
 783                         'page_len'          => 0, # Fill this in shortly...
 784                 ), __METHOD__, 'IGNORE' );
 785
 786                 $affected = $dbw->affectedRows();
 787
 788                 if ( $affected ) {
 789                         $newid = $dbw->insertId();
 790                         $this->mTitle->resetArticleID( $newid );
 791                 }
 792                 wfProfileOut( __METHOD__ );
 793
 794                 return $affected ? $newid : false;
 795         }
 796
 797         /**
 798          * Update the page record to point to a newly saved revision.
 799          *
 800          * @param $dbw DatabaseBase: object
 801          * @param $revision Revision: For ID number, and text used to set
 802          *                  length and redirect status fields
 803          * @param $lastRevision Integer: if given, will not overwrite the page field
 804          *                      when different from the currently set value.
 805          *                      Giving 0 indicates the new page flag should be set
 806          *                      on.
 807          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 808          *                           removing rows in redirect table.
 809          * @return bool true on success, false on failure
 810          * @private
 811          */
 812         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 813                 wfProfileIn( __METHOD__ );
 814
 815                 $text = $revision->getText();
 816                 $rt = Title::newFromRedirectRecurse( $text );
 817
 818                 $conditions = array( 'page_id' => $this->getId() );
 819
 820                 if ( !is_null( $lastRevision ) ) {
 821                         # An extra check against threads stepping on each other
 822                         $conditions['page_latest'] = $lastRevision;
 823                 }
 824
 825                 $now = wfTimestampNow();
 826                 $dbw->update( 'page',
 827                         array( /* SET */
 828                                 'page_latest'      => $revision->getId(),
 829                                 'page_touched'     => $dbw->timestamp( $now ),
 830                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 831                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 832                                 'page_len'         => strlen( $text ),
 833                         ),
 834                         $conditions,
 835                         __METHOD__ );
 836
 837                 $result = $dbw->affectedRows() != 0;
 838                 if ( $result ) {
 839                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 840                         $this->setCachedLastEditTime( $now );
 841                 }
 842
 843                 wfProfileOut( __METHOD__ );
 844                 return $result;
 845         }
 846
 847         /**
 848          * Get the cached timestamp for the last time the page changed.
 849          * This is only used to help handle slave lag by comparing to page_touched.
 850          * @return string MW timestamp
 851          */
 852         protected function getCachedLastEditTime() {
 853                 global $wgMemc;
 854                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 855                 return $wgMemc->get( $key );
 856         }
 857
 858         /**
 859          * Set the cached timestamp for the last time the page changed.
 860          * This is only used to help handle slave lag by comparing to page_touched.
 861          * @param $timestamp string
 862          * @return void
 863          */
 864         public function setCachedLastEditTime( $timestamp ) {
 865                 global $wgMemc;
 866                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 867                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 868         }
 869
 870         /**
 871          * Add row to the redirect table if this is a redirect, remove otherwise.
 872          *
 873          * @param $dbw DatabaseBase
 874          * @param $redirectTitle Title object pointing to the redirect target,
 875          *                       or NULL if this is not a redirect
 876          * @param $lastRevIsRedirect If given, will optimize adding and
 877          *                           removing rows in redirect table.
 878          * @return bool true on success, false on failure
 879          * @private
 880          */
 881         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 882                 // Always update redirects (target link might have changed)
 883                 // Update/Insert if we don't know if the last revision was a redirect or not
 884                 // Delete if changing from redirect to non-redirect
 885                 $isRedirect = !is_null( $redirectTitle );
 886
 887                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 888                         return true;
 889                 }
 890
 891                 wfProfileIn( __METHOD__ );
 892                 if ( $isRedirect ) {
 893                         $this->insertRedirectEntry( $redirectTitle );
 894                 } else {
 895                         // This is not a redirect, remove row from redirect table
 896                         $where = array( 'rd_from' => $this->getId() );
 897                         $dbw->delete( 'redirect', $where, __METHOD__ );
 898                 }
 899
 900                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 901                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 902                 }
 903                 wfProfileOut( __METHOD__ );
 904
 905                 return ( $dbw->affectedRows() != 0 );
 906         }
 907
 908         /**
 909          * If the given revision is newer than the currently set page_latest,
 910          * update the page record. Otherwise, do nothing.
 911          *
 912          * @param $dbw Database object
 913          * @param $revision Revision object
 914          * @return mixed
 915          */
 916         public function updateIfNewerOn( $dbw, $revision ) {
 917                 wfProfileIn( __METHOD__ );
 918
 919                 $row = $dbw->selectRow(
 920                         array( 'revision', 'page' ),
 921                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 922                         array(
 923                                 'page_id' => $this->getId(),
 924                                 'page_latest=rev_id' ),
 925                         __METHOD__ );
 926
 927                 if ( $row ) {
 928                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 929                                 wfProfileOut( __METHOD__ );
 930                                 return false;
 931                         }
 932                         $prev = $row->rev_id;
 933                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 934                 } else {
 935                         # No or missing previous revision; mark the page as new
 936                         $prev = 0;
 937                         $lastRevIsRedirect = null;
 938                 }
 939
 940                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 941
 942                 wfProfileOut( __METHOD__ );
 943                 return $ret;
 944         }
 945
 946         /**
 947          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 948          * @param $text String: new text of the section
 949          * @param $summary String: new section's subject, only if $section is 'new'
 950          * @param $edittime String: revision timestamp or null to use the current revision
 951          * @return string Complete article text, or null if error
 952          */
 953         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 954                 wfProfileIn( __METHOD__ );
 955
 956                 if ( strval( $section ) == '' ) {
 957                         // Whole-page edit; let the whole text through
 958                 } else {
 959                         if ( is_null( $edittime ) ) {
 960                                 $rev = Revision::newFromTitle( $this->mTitle );
 961                         } else {
 962                                 $dbw = wfGetDB( DB_MASTER );
 963                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 964                         }
 965
 966                         if ( !$rev ) {
 967                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 968                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 969                                 wfProfileOut( __METHOD__ );
 970                                 return null;
 971                         }
 972
 973                         $oldtext = $rev->getText();
 974
 975                         if ( $section == 'new' ) {
 976                                 # Inserting a new section
 977                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 978                                 $text = strlen( trim( $oldtext ) ) > 0
 979                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 980                                                 : "{$subject}{$text}";
 981                         } else {
 982                                 # Replacing an existing section; roll out the big guns
 983                                 global $wgParser;
 984
 985                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 986                         }
 987                 }
 988
 989                 wfProfileOut( __METHOD__ );
 990                 return $text;
 991         }
 992
 993         /**
 994          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
 995          * @param $flags Int
 996          * @return Int updated $flags
 997          */
 998         function checkFlags( $flags ) {
 999                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1000                         if ( $this->mTitle->getArticleID() ) {
1001                                 $flags |= EDIT_UPDATE;
1002                         } else {
1003                                 $flags |= EDIT_NEW;
1004                         }
1005                 }
1006
1007                 return $flags;
1008         }
1009
1010         /**
1011          * Change an existing article or create a new article. Updates RC and all necessary caches,
1012          * optionally via the deferred update array.
1013          *
1014          * @param $text String: new text
1015          * @param $summary String: edit summary
1016          * @param $flags Integer bitfield:
1017          *      EDIT_NEW
1018          *          Article is known or assumed to be non-existent, create a new one
1019          *      EDIT_UPDATE
1020          *          Article is known or assumed to be pre-existing, update it
1021          *      EDIT_MINOR
1022          *          Mark this edit minor, if the user is allowed to do so
1023          *      EDIT_SUPPRESS_RC
1024          *          Do not log the change in recentchanges
1025          *      EDIT_FORCE_BOT
1026          *          Mark the edit a "bot" edit regardless of user rights
1027          *      EDIT_DEFER_UPDATES
1028          *          Defer some of the updates until the end of index.php
1029          *      EDIT_AUTOSUMMARY
1030          *          Fill in blank summaries with generated text where possible
1031          *
1032          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1033          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1034          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1035          * edit-already-exists error will be returned. These two conditions are also possible with
1036          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1037          *
1038          * @param $baseRevId the revision ID this edit was based off, if any
1039          * @param $user User the user doing the edit
1040          *
1041          * @return Status object. Possible errors:
1042          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1043          *     edit-gone-missing:       In update mode, but the article didn't exist
1044          *     edit-conflict:           In update mode, the article changed unexpectedly
1045          *     edit-no-change:          Warning that the text was the same as before
1046          *     edit-already-exists:     In creation mode, but the article already exists
1047          *
1048          *  Extensions may define additional errors.
1049          *
1050          *  $return->value will contain an associative array with members as follows:
1051          *     new:                     Boolean indicating if the function attempted to create a new article
1052          *     revision:                The revision object for the inserted revision, or null
1053          *
1054          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1055          */
1056         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1057                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1058
1059                 # Low-level sanity check
1060                 if ( $this->mTitle->getText() === '' ) {
1061                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1062                 }
1063
1064                 wfProfileIn( __METHOD__ );
1065
1066                 $user = is_null( $user ) ? $wgUser : $user;
1067                 $status = Status::newGood( array() );
1068
1069                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1070                 $this->loadPageData();
1071
1072                 $flags = $this->checkFlags( $flags );
1073
1074                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1075                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1076                 {
1077                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1078
1079                         if ( $status->isOK() ) {
1080                                 $status->fatal( 'edit-hook-aborted' );
1081                         }
1082
1083                         wfProfileOut( __METHOD__ );
1084                         return $status;
1085                 }
1086
1087                 # Silently ignore EDIT_MINOR if not allowed
1088                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1089                 $bot = $flags & EDIT_FORCE_BOT;
1090
1091                 $oldtext = $this->getRawText(); // current revision
1092                 $oldsize = strlen( $oldtext );
1093                 $oldcountable = $this->isCountable();
1094
1095                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1096                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1097                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1098                 }
1099
1100                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1101                 $text = $editInfo->pst;
1102                 $newsize = strlen( $text );
1103
1104                 $dbw = wfGetDB( DB_MASTER );
1105                 $now = wfTimestampNow();
1106                 $this->mTimestamp = $now;
1107
1108                 if ( $flags & EDIT_UPDATE ) {
1109                         # Update article, but only if changed.
1110                         $status->value['new'] = false;
1111
1112                         # Make sure the revision is either completely inserted or not inserted at all
1113                         if ( !$wgDBtransactions ) {
1114                                 $userAbort = ignore_user_abort( true );
1115                         }
1116
1117                         $revision = new Revision( array(
1118                                 'page'       => $this->getId(),
1119                                 'comment'    => $summary,
1120                                 'minor_edit' => $isminor,
1121                                 'text'       => $text,
1122                                 'parent_id'  => $this->mLatest,
1123                                 'user'       => $user->getId(),
1124                                 'user_text'  => $user->getName(),
1125                                 'timestamp'  => $now
1126                         ) );
1127
1128                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1129
1130                         if ( $changed ) {
1131                                 if ( !$this->mLatest ) {
1132                                         # Article gone missing
1133                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1134                                         $status->fatal( 'edit-gone-missing' );
1135
1136                                         wfProfileOut( __METHOD__ );
1137                                         return $status;
1138                                 }
1139
1140                                 $dbw->begin();
1141                                 $revisionId = $revision->insertOn( $dbw );
1142
1143                                 # Update page
1144                                 #
1145                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1146                                 # during the course of this function. This makes sure that EditPage can detect
1147                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1148                                 # before this function is called. A previous function used a separate query, this
1149                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1150                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1151
1152                                 if ( !$ok ) {
1153                                         /* Belated edit conflict! Run away!! */
1154                                         $status->fatal( 'edit-conflict' );
1155
1156                                         # Delete the invalid revision if the DB is not transactional
1157                                         if ( !$wgDBtransactions ) {
1158                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1159                                         }
1160
1161                                         $revisionId = 0;
1162                                         $dbw->rollback();
1163                                 } else {
1164                                         global $wgUseRCPatrol;
1165                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1166                                         # Update recentchanges
1167                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1168                                                 # Mark as patrolled if the user can do so
1169                                                 $patrolled = $wgUseRCPatrol && !count(
1170                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1171                                                 # Add RC row to the DB
1172                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1173                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1174                                                         $revisionId, $patrolled
1175                                                 );
1176
1177                                                 # Log auto-patrolled edits
1178                                                 if ( $patrolled ) {
1179                                                         PatrolLog::record( $rc, true );
1180                                                 }
1181                                         }
1182                                         $user->incEditCount();
1183                                         $dbw->commit();
1184                                 }
1185                         }
1186
1187                         if ( !$wgDBtransactions ) {
1188                                 ignore_user_abort( $userAbort );
1189                         }
1190
1191                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1192                         if ( !$status->isOK() ) {
1193                                 wfProfileOut( __METHOD__ );
1194                                 return $status;
1195                         }
1196
1197                         # Update links tables, site stats, etc.
1198                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1199                                 'oldcountable' => $oldcountable ) );
1200
1201                         if ( !$changed ) {
1202                                 $status->warning( 'edit-no-change' );
1203                                 $revision = null;
1204                                 // Keep the same revision ID, but do some updates on it
1205                                 $revisionId = $this->getLatest();
1206                                 // Update page_touched, this is usually implicit in the page update
1207                                 // Other cache updates are done in onArticleEdit()
1208                                 $this->mTitle->invalidateCache();
1209                         }
1210                 } else {
1211                         # Create new article
1212                         $status->value['new'] = true;
1213
1214                         $dbw->begin();
1215
1216                         # Add the page record; stake our claim on this title!
1217                         # This will return false if the article already exists
1218                         $newid = $this->insertOn( $dbw );
1219
1220                         if ( $newid === false ) {
1221                                 $dbw->rollback();
1222                                 $status->fatal( 'edit-already-exists' );
1223
1224                                 wfProfileOut( __METHOD__ );
1225                                 return $status;
1226                         }
1227
1228                         # Save the revision text...
1229                         $revision = new Revision( array(
1230                                 'page'       => $newid,
1231                                 'comment'    => $summary,
1232                                 'minor_edit' => $isminor,
1233                                 'text'       => $text,
1234                                 'user'       => $user->getId(),
1235                                 'user_text'  => $user->getName(),
1236                                 'timestamp'  => $now
1237                         ) );
1238                         $revisionId = $revision->insertOn( $dbw );
1239
1240                         $this->mTitle->resetArticleID( $newid );
1241                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
1242                         # @todo FIXME?
1243                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
1244
1245                         # Update the page record with revision data
1246                         $this->updateRevisionOn( $dbw, $revision, 0 );
1247
1248                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1249
1250                         # Update recentchanges
1251                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1252                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1253
1254                                 # Mark as patrolled if the user can do so
1255                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1256                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1257                                 # Add RC row to the DB
1258                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1259                                         '', strlen( $text ), $revisionId, $patrolled );
1260
1261                                 # Log auto-patrolled edits
1262                                 if ( $patrolled ) {
1263                                         PatrolLog::record( $rc, true );
1264                                 }
1265                         }
1266                         $user->incEditCount();
1267                         $dbw->commit();
1268
1269                         # Update links, etc.
1270                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1271
1272                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1273                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1274                 }
1275
1276                 # Do updates right now unless deferral was requested
1277                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1278                         DeferredUpdates::doUpdates();
1279                 }
1280
1281                 // Return the new revision (or null) to the caller
1282                 $status->value['revision'] = $revision;
1283
1284                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1285                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1286
1287                 # Promote user to any groups they meet the criteria for
1288                 $user->addAutopromoteOnceGroups( 'onEdit' );
1289
1290                 wfProfileOut( __METHOD__ );
1291                 return $status;
1292         }
1293
1294         /**
1295          * Update the article's restriction field, and leave a log entry.
1296          *
1297          * @param $limit Array: set of restriction keys
1298          * @param $reason String
1299          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1300          * @param $expiry Array: per restriction type expiration
1301          * @param $user User The user updating the restrictions
1302          * @return bool true on success
1303          */
1304         public function updateRestrictions(
1305                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1306         ) {
1307                 global $wgUser, $wgContLang;
1308                 $user = is_null( $user ) ? $wgUser : $user;
1309
1310                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1311
1312                 $id = $this->mTitle->getArticleID();
1313
1314                 if ( $id <= 0 ) {
1315                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1316                         return false;
1317                 }
1318
1319                 if ( wfReadOnly() ) {
1320                         wfDebug( "updateRestrictions failed: read-only\n" );
1321                         return false;
1322                 }
1323
1324                 if ( count( $this->mTitle->getUserPermissionsErrors( 'protect', $user ) ) ) {
1325                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1326                         return false;
1327                 }
1328
1329                 if ( !$cascade ) {
1330                         $cascade = false;
1331                 }
1332
1333                 // Take this opportunity to purge out expired restrictions
1334                 Title::purgeExpiredRestrictions();
1335
1336                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1337                 # we expect a single selection, but the schema allows otherwise.
1338                 $current = array();
1339                 $updated = self::flattenRestrictions( $limit );
1340                 $changed = false;
1341
1342                 foreach ( $restrictionTypes as $action ) {
1343                         if ( isset( $expiry[$action] ) ) {
1344                                 # Get current restrictions on $action
1345                                 $aLimits = $this->mTitle->getRestrictions( $action );
1346                                 $current[$action] = implode( '', $aLimits );
1347                                 # Are any actual restrictions being dealt with here?
1348                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1349
1350                                 # If something changed, we need to log it. Checking $aRChanged
1351                                 # assures that "unprotecting" a page that is not protected does
1352                                 # not log just because the expiry was "changed".
1353                                 if ( $aRChanged &&
1354                                         $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
1355                                 {
1356                                         $changed = true;
1357                                 }
1358                         }
1359                 }
1360
1361                 $current = self::flattenRestrictions( $current );
1362
1363                 $changed = ( $changed || $current != $updated );
1364                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1365                 $protect = ( $updated != '' );
1366
1367                 # If nothing's changed, do nothing
1368                 if ( $changed ) {
1369                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1370                                 $dbw = wfGetDB( DB_MASTER );
1371
1372                                 # Prepare a null revision to be added to the history
1373                                 $modified = $current != '' && $protect;
1374
1375                                 if ( $protect ) {
1376                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1377                                 } else {
1378                                         $comment_type = 'unprotectedarticle';
1379                                 }
1380
1381                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1382
1383                                 # Only restrictions with the 'protect' right can cascade...
1384                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1385                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1386
1387                                 # The schema allows multiple restrictions
1388                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1389                                         $cascade = false;
1390                                 }
1391
1392                                 $cascade_description = '';
1393
1394                                 if ( $cascade ) {
1395                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1396                                 }
1397
1398                                 if ( $reason ) {
1399                                         $comment .= ": $reason";
1400                                 }
1401
1402                                 $editComment = $comment;
1403                                 $encodedExpiry = array();
1404                                 $protect_description = '';
1405                                 foreach ( $limit as $action => $restrictions ) {
1406                                         if ( !isset( $expiry[$action] ) )
1407                                                 $expiry[$action] = $dbw->getInfinity();
1408
1409                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1410                                         if ( $restrictions != '' ) {
1411                                                 $protect_description .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1412                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1413                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1414                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1415                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1416                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1417                                                 } else {
1418                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1419                                                 }
1420
1421                                                 $protect_description .= ') ';
1422                                         }
1423                                 }
1424                                 $protect_description = trim( $protect_description );
1425
1426                                 if ( $protect_description && $protect ) {
1427                                         $editComment .= " ($protect_description)";
1428                                 }
1429
1430                                 if ( $cascade ) {
1431                                         $editComment .= "$cascade_description";
1432                                 }
1433
1434                                 # Update restrictions table
1435                                 foreach ( $limit as $action => $restrictions ) {
1436                                         if ( $restrictions != '' ) {
1437                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1438                                                         array( 'pr_page' => $id,
1439                                                                 'pr_type' => $action,
1440                                                                 'pr_level' => $restrictions,
1441                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1442                                                                 'pr_expiry' => $encodedExpiry[$action]
1443                                                         ),
1444                                                         __METHOD__
1445                                                 );
1446                                         } else {
1447                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1448                                                         'pr_type' => $action ), __METHOD__ );
1449                                         }
1450                                 }
1451
1452                                 # Insert a null revision
1453                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1454                                 $nullRevId = $nullRevision->insertOn( $dbw );
1455
1456                                 $latest = $this->getLatest();
1457                                 # Update page record
1458                                 $dbw->update( 'page',
1459                                         array( /* SET */
1460                                                 'page_touched' => $dbw->timestamp(),
1461                                                 'page_restrictions' => '',
1462                                                 'page_latest' => $nullRevId
1463                                         ), array( /* WHERE */
1464                                                 'page_id' => $id
1465                                         ), __METHOD__
1466                                 );
1467
1468                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1469                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1470
1471                                 # Update the protection log
1472                                 $log = new LogPage( 'protect' );
1473                                 if ( $protect ) {
1474                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1475                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1476                                 } else {
1477                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1478                                 }
1479                         } # End hook
1480                 } # End "changed" check
1481
1482                 return true;
1483         }
1484
1485         /**
1486          * Take an array of page restrictions and flatten it to a string
1487          * suitable for insertion into the page_restrictions field.
1488          * @param $limit Array
1489          * @return String
1490          */
1491         protected static function flattenRestrictions( $limit ) {
1492                 if ( !is_array( $limit ) ) {
1493                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1494                 }
1495
1496                 $bits = array();
1497                 ksort( $limit );
1498
1499                 foreach ( $limit as $action => $restrictions ) {
1500                         if ( $restrictions != '' ) {
1501                                 $bits[] = "$action=$restrictions";
1502                         }
1503                 }
1504
1505                 return implode( ':', $bits );
1506         }
1507
1508         /**
1509          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1510          */
1511         public function isBigDeletion() {
1512                 global $wgDeleteRevisionsLimit;
1513
1514                 if ( $wgDeleteRevisionsLimit ) {
1515                         $revCount = $this->estimateRevisionCount();
1516
1517                         return $revCount > $wgDeleteRevisionsLimit;
1518                 }
1519
1520                 return false;
1521         }
1522
1523         /**
1524          * @return int approximate revision count
1525          */
1526         public function estimateRevisionCount() {
1527                 $dbr = wfGetDB( DB_SLAVE );
1528
1529                 // For an exact count...
1530                 // return $dbr->selectField( 'revision', 'COUNT(*)',
1531                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
1532                 return $dbr->estimateRowCount( 'revision', '*',
1533                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1534         }
1535
1536         /**
1537          * Get the last N authors
1538          * @param $num Integer: number of revisions to get
1539          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1540          * @return array Array of authors, duplicates not removed
1541          */
1542         public function getLastNAuthors( $num, $revLatest = 0 ) {
1543                 wfProfileIn( __METHOD__ );
1544                 // First try the slave
1545                 // If that doesn't have the latest revision, try the master
1546                 $continue = 2;
1547                 $db = wfGetDB( DB_SLAVE );
1548
1549                 do {
1550                         $res = $db->select( array( 'page', 'revision' ),
1551                                 array( 'rev_id', 'rev_user_text' ),
1552                                 array(
1553                                         'page_namespace' => $this->mTitle->getNamespace(),
1554                                         'page_title' => $this->mTitle->getDBkey(),
1555                                         'rev_page = page_id'
1556                                 ), __METHOD__,
1557                                 array(
1558                                         'ORDER BY' => 'rev_timestamp DESC',
1559                                         'LIMIT' => $num
1560                                 )
1561                         );
1562
1563                         if ( !$res ) {
1564                                 wfProfileOut( __METHOD__ );
1565                                 return array();
1566                         }
1567
1568                         $row = $db->fetchObject( $res );
1569
1570                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1571                                 $db = wfGetDB( DB_MASTER );
1572                                 $continue--;
1573                         } else {
1574                                 $continue = 0;
1575                         }
1576                 } while ( $continue );
1577
1578                 $authors = array( $row->rev_user_text );
1579
1580                 foreach ( $res as $row ) {
1581                         $authors[] = $row->rev_user_text;
1582                 }
1583
1584                 wfProfileOut( __METHOD__ );
1585                 return $authors;
1586         }
1587
1588         /**
1589          * Back-end article deletion
1590          * Deletes the article with database consistency, writes logs, purges caches
1591          *
1592          * @param $reason string delete reason for deletion log
1593          * @param suppress bitfield
1594          *      Revision::DELETED_TEXT
1595          *      Revision::DELETED_COMMENT
1596          *      Revision::DELETED_USER
1597          *      Revision::DELETED_RESTRICTED
1598          * @param $id int article ID
1599          * @param $commit boolean defaults to true, triggers transaction end
1600          * @param &$errors Array of errors to append to
1601          * @param $user User The relevant user
1602          * @return boolean true if successful
1603          */
1604         public function doDeleteArticle(
1605                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1606         ) {
1607                 global $wgUseTrackbacks, $wgEnableInterwikiTemplatesTracking, $wgGlobalDatabase, $wgUser;
1608                 $user = is_null( $user ) ? $wgUser : $user;
1609
1610                 wfDebug( __METHOD__ . "\n" );
1611
1612                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1613                         return false;
1614                 }
1615                 $dbw = wfGetDB( DB_MASTER );
1616                 $t = $this->mTitle->getDBkey();
1617                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1618
1619                 if ( $t === '' || $id == 0 ) {
1620                         return false;
1621                 }
1622
1623                 DeferredUpdates::addUpdate(
1624                         new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 )
1625                 );
1626
1627                 // Bitfields to further suppress the content
1628                 if ( $suppress ) {
1629                         $bitfield = 0;
1630                         // This should be 15...
1631                         $bitfield |= Revision::DELETED_TEXT;
1632                         $bitfield |= Revision::DELETED_COMMENT;
1633                         $bitfield |= Revision::DELETED_USER;
1634                         $bitfield |= Revision::DELETED_RESTRICTED;
1635                 } else {
1636                         $bitfield = 'rev_deleted';
1637                 }
1638
1639                 $dbw->begin();
1640                 // For now, shunt the revision data into the archive table.
1641                 // Text is *not* removed from the text table; bulk storage
1642                 // is left intact to avoid breaking block-compression or
1643                 // immutable storage schemes.
1644                 //
1645                 // For backwards compatibility, note that some older archive
1646                 // table entries will have ar_text and ar_flags fields still.
1647                 //
1648                 // In the future, we may keep revisions and mark them with
1649                 // the rev_deleted field, which is reserved for this purpose.
1650                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1651                         array(
1652                                 'ar_namespace'  => 'page_namespace',
1653                                 'ar_title'      => 'page_title',
1654                                 'ar_comment'    => 'rev_comment',
1655                                 'ar_user'       => 'rev_user',
1656                                 'ar_user_text'  => 'rev_user_text',
1657                                 'ar_timestamp'  => 'rev_timestamp',
1658                                 'ar_minor_edit' => 'rev_minor_edit',
1659                                 'ar_rev_id'     => 'rev_id',
1660                                 'ar_parent_id'  => 'rev_parent_id',
1661                                 'ar_text_id'    => 'rev_text_id',
1662                                 'ar_text'       => '\'\'', // Be explicit to appease
1663                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1664                                 'ar_len'        => 'rev_len',
1665                                 'ar_page_id'    => 'page_id',
1666                                 'ar_deleted'    => $bitfield
1667                         ), array(
1668                                 'page_id' => $id,
1669                                 'page_id = rev_page'
1670                         ), __METHOD__
1671                 );
1672
1673                 # Delete restrictions for it
1674                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1675
1676                 # Now that it's safely backed up, delete it
1677                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1678                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1679
1680                 if ( !$ok ) {
1681                         $dbw->rollback();
1682                         return false;
1683                 }
1684
1685                 # Fix category table counts
1686                 $cats = array();
1687                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1688
1689                 foreach ( $res as $row ) {
1690                         $cats [] = $row->cl_to;
1691                 }
1692
1693                 $this->updateCategoryCounts( array(), $cats );
1694
1695                 # If using cascading deletes, we can skip some explicit deletes
1696                 if ( !$dbw->cascadingDeletes() ) {
1697                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1698
1699                         if ( $wgUseTrackbacks ) {
1700                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1701                         }
1702
1703                         # Delete outgoing links
1704                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
1705                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
1706                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
1707                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
1708                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
1709                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
1710                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
1711                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
1712                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
1713
1714                         if ( $wgEnableInterwikiTemplatesTracking && $wgGlobalDatabase ) {
1715                                 $dbw2 = wfGetDB( DB_MASTER, array(), $wgGlobalDatabase );
1716                                 $dbw2->delete( 'globaltemplatelinks',
1717                                                         array(  'gtl_from_wiki' => wfGetID(),
1718                                                                         'gtl_from_page' => $id )
1719                                                         );
1720                 }
1721                 }
1722
1723                 # If using cleanup triggers, we can skip some manual deletes
1724                 if ( !$dbw->cleanupTriggers() ) {
1725                         # Clean up recentchanges entries...
1726                         $dbw->delete( 'recentchanges',
1727                                 array( 'rc_type != ' . RC_LOG,
1728                                         'rc_namespace' => $this->mTitle->getNamespace(),
1729                                         'rc_title' => $this->mTitle->getDBkey() ),
1730                                 __METHOD__ );
1731                         $dbw->delete( 'recentchanges',
1732                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1733                                 __METHOD__ );
1734                 }
1735
1736                 # Clear caches
1737                 self::onArticleDelete( $this->mTitle );
1738
1739                 # Clear the cached article id so the interface doesn't act like we exist
1740                 $this->mTitle->resetArticleID( 0 );
1741
1742                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1743                 $logtype = $suppress ? 'suppress' : 'delete';
1744
1745                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
1746                 $logEntry->setPerformer( $user );
1747                 $logEntry->setTarget( $this->mTitle );
1748                 $logEntry->setComment( $reason );
1749                 $logid = $logEntry->insert();
1750                 $logEntry->publish( $logid );
1751
1752                 if ( $commit ) {
1753                         $dbw->commit();
1754                 }
1755
1756                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1757                 return true;
1758         }
1759
1760         /**
1761          * Roll back the most recent consecutive set of edits to a page
1762          * from the same user; fails if there are no eligible edits to
1763          * roll back to, e.g. user is the sole contributor. This function
1764          * performs permissions checks on $user, then calls commitRollback()
1765          * to do the dirty work
1766          *
1767          * @param $fromP String: Name of the user whose edits to rollback.
1768          * @param $summary String: Custom summary. Set to default summary if empty.
1769          * @param $token String: Rollback token.
1770          * @param $bot Boolean: If true, mark all reverted edits as bot.
1771          *
1772          * @param $resultDetails Array: contains result-specific array of additional values
1773          *    'alreadyrolled' : 'current' (rev)
1774          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1775          *
1776          * @param $user User The user performing the rollback
1777          * @return array of errors, each error formatted as
1778          *   array(messagekey, param1, param2, ...).
1779          * On success, the array is empty.  This array can also be passed to
1780          * OutputPage::showPermissionsErrorPage().
1781          */
1782         public function doRollback(
1783                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
1784         ) {
1785                 $resultDetails = null;
1786
1787                 # Check permissions
1788                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1789                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1790                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1791
1792                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1793                         $errors[] = array( 'sessionfailure' );
1794                 }
1795
1796                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1797                         $errors[] = array( 'actionthrottledtext' );
1798                 }
1799
1800                 # If there were errors, bail out now
1801                 if ( !empty( $errors ) ) {
1802                         return $errors;
1803                 }
1804
1805                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1806         }
1807
1808         /**
1809          * Backend implementation of doRollback(), please refer there for parameter
1810          * and return value documentation
1811          *
1812          * NOTE: This function does NOT check ANY permissions, it just commits the
1813          * rollback to the DB. Therefore, you should only call this function direct-
1814          * ly if you want to use custom permissions checks. If you don't, use
1815          * doRollback() instead.
1816          * @param $fromP String: Name of the user whose edits to rollback.
1817          * @param $summary String: Custom summary. Set to default summary if empty.
1818          * @param $bot Boolean: If true, mark all reverted edits as bot.
1819          *
1820          * @param $resultDetails Array: contains result-specific array of additional values
1821          * @param $guser User The user performing the rollback
1822          */
1823         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
1824                 global $wgUseRCPatrol, $wgContLang;
1825
1826                 $dbw = wfGetDB( DB_MASTER );
1827
1828                 if ( wfReadOnly() ) {
1829                         return array( array( 'readonlytext' ) );
1830                 }
1831
1832                 # Get the last editor
1833                 $current = Revision::newFromTitle( $this->mTitle );
1834                 if ( is_null( $current ) ) {
1835                         # Something wrong... no page?
1836                         return array( array( 'notanarticle' ) );
1837                 }
1838
1839                 $from = str_replace( '_', ' ', $fromP );
1840                 # User name given should match up with the top revision.
1841                 # If the user was deleted then $from should be empty.
1842                 if ( $from != $current->getUserText() ) {
1843                         $resultDetails = array( 'current' => $current );
1844                         return array( array( 'alreadyrolled',
1845                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1846                                 htmlspecialchars( $fromP ),
1847                                 htmlspecialchars( $current->getUserText() )
1848                         ) );
1849                 }
1850
1851                 # Get the last edit not by this guy...
1852                 # Note: these may not be public values
1853                 $user = intval( $current->getRawUser() );
1854                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1855                 $s = $dbw->selectRow( 'revision',
1856                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1857                         array( 'rev_page' => $current->getPage(),
1858                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1859                         ), __METHOD__,
1860                         array( 'USE INDEX' => 'page_timestamp',
1861                                 'ORDER BY' => 'rev_timestamp DESC' )
1862                         );
1863                 if ( $s === false ) {
1864                         # No one else ever edited this page
1865                         return array( array( 'cantrollback' ) );
1866                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1867                         # Only admins can see this text
1868                         return array( array( 'notvisiblerev' ) );
1869                 }
1870
1871                 $set = array();
1872                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1873                         # Mark all reverted edits as bot
1874                         $set['rc_bot'] = 1;
1875                 }
1876
1877                 if ( $wgUseRCPatrol ) {
1878                         # Mark all reverted edits as patrolled
1879                         $set['rc_patrolled'] = 1;
1880                 }
1881
1882                 if ( count( $set ) ) {
1883                         $dbw->update( 'recentchanges', $set,
1884                                 array( /* WHERE */
1885                                         'rc_cur_id' => $current->getPage(),
1886                                         'rc_user_text' => $current->getUserText(),
1887                                         "rc_timestamp > '{$s->rev_timestamp}'",
1888                                 ), __METHOD__
1889                         );
1890                 }
1891
1892                 # Generate the edit summary if necessary
1893                 $target = Revision::newFromId( $s->rev_id );
1894                 if ( empty( $summary ) ) {
1895                         if ( $from == '' ) { // no public user name
1896                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1897                         } else {
1898                                 $summary = wfMsgForContent( 'revertpage' );
1899                         }
1900                 }
1901
1902                 # Allow the custom summary to use the same args as the default message
1903                 $args = array(
1904                         $target->getUserText(), $from, $s->rev_id,
1905                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1906                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1907                 );
1908                 $summary = wfMsgReplaceArgs( $summary, $args );
1909
1910                 # Save
1911                 $flags = EDIT_UPDATE;
1912
1913                 if ( $guser->isAllowed( 'minoredit' ) ) {
1914                         $flags |= EDIT_MINOR;
1915                 }
1916
1917                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1918                         $flags |= EDIT_FORCE_BOT;
1919                 }
1920
1921                 # Actually store the edit
1922                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1923                 if ( !empty( $status->value['revision'] ) ) {
1924                         $revId = $status->value['revision']->getId();
1925                 } else {
1926                         $revId = false;
1927                 }
1928
1929                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1930
1931                 $resultDetails = array(
1932                         'summary' => $summary,
1933                         'current' => $current,
1934                         'target'  => $target,
1935                         'newid'   => $revId
1936                 );
1937
1938                 return array();
1939         }
1940
1941         /**
1942          * Do standard deferred updates after page view
1943          * @param $user User The relevant user
1944          */
1945         public function doViewUpdates( User $user ) {
1946                 global $wgDisableCounters;
1947                 if ( wfReadOnly() ) {
1948                         return;
1949                 }
1950
1951                 # Don't update page view counters on views from bot users (bug 14044)
1952                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
1953                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1954                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1955                 }
1956
1957                 # Update newtalk / watchlist notification status
1958                 $user->clearNotification( $this->mTitle );
1959         }
1960
1961         /**
1962          * Prepare text which is about to be saved.
1963          * Returns a stdclass with source, pst and output members
1964          */
1965         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1966                 global $wgParser, $wgUser;
1967                 $user = is_null( $user ) ? $wgUser : $user;
1968                 // @TODO fixme: check $user->getId() here???
1969                 if ( $this->mPreparedEdit
1970                         && $this->mPreparedEdit->newText == $text
1971                         && $this->mPreparedEdit->revid == $revid
1972                 ) {
1973                         // Already prepared
1974                         return $this->mPreparedEdit;
1975                 }
1976
1977                 $popts = ParserOptions::newFromUser( $user );
1978                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1979
1980                 $edit = (object)array();
1981                 $edit->revid = $revid;
1982                 $edit->newText = $text;
1983                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
1984                 $edit->popts = $this->getParserOptions( true );
1985                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1986                 $edit->oldText = $this->getRawText();
1987
1988                 $this->mPreparedEdit = $edit;
1989
1990                 return $edit;
1991         }
1992
1993         /**
1994          * Do standard deferred updates after page edit.
1995          * Update links tables, site stats, search index and message cache.
1996          * Purges pages that include this page if the text was changed here.
1997          * Every 100th edit, prune the recent changes table.
1998          *
1999          * @private
2000          * @param $revision Revision object
2001          * @param $user User object that did the revision
2002          * @param $options Array of options, following indexes are used:
2003          * - changed: boolean, whether the revision changed the content (default true)
2004          * - created: boolean, whether the revision created the page (default false)
2005          * - oldcountable: boolean or null (default null):
2006          *   - boolean: whether the page was counted as an article before that
2007          *     revision, only used in changed is true and created is false
2008          *   - null: don't change the article count
2009          */
2010         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2011                 global $wgEnableParserCache;
2012
2013                 wfProfileIn( __METHOD__ );
2014
2015                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2016                 $text = $revision->getText();
2017
2018                 # Parse the text
2019                 # Be careful not to double-PST: $text is usually already PST-ed once
2020                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2021                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2022                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
2023                 } else {
2024                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2025                         $editInfo = $this->mPreparedEdit;
2026                 }
2027
2028                 # Save it to the parser cache
2029                 if ( $wgEnableParserCache ) {
2030                         $parserCache = ParserCache::singleton();
2031                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2032                 }
2033
2034                 # Update the links tables
2035                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2036                 $u->doUpdate();
2037
2038                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2039
2040                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2041                         if ( 0 == mt_rand( 0, 99 ) ) {
2042                                 // Flush old entries from the `recentchanges` table; we do this on
2043                                 // random requests so as to avoid an increase in writes for no good reason
2044                                 global $wgRCMaxAge;
2045
2046                                 $dbw = wfGetDB( DB_MASTER );
2047                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2048                                 $dbw->delete(
2049                                         'recentchanges',
2050                                         array( "rc_timestamp < '$cutoff'" ),
2051                                         __METHOD__
2052                                 );
2053                         }
2054                 }
2055
2056                 $id = $this->getId();
2057                 $title = $this->mTitle->getPrefixedDBkey();
2058                 $shortTitle = $this->mTitle->getDBkey();
2059
2060                 if ( 0 == $id ) {
2061                         wfProfileOut( __METHOD__ );
2062                         return;
2063                 }
2064
2065                 if ( !$options['changed'] ) {
2066                         $good = 0;
2067                         $total = 0;
2068                 } elseif ( $options['created'] ) {
2069                         $good = (int)$this->isCountable( $editInfo );
2070                         $total = 1;
2071                 } elseif ( $options['oldcountable'] !== null ) {
2072                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2073                         $total = 0;
2074                 } else {
2075                         $good = 0;
2076                         $total = 0;
2077                 }
2078
2079                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2080                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
2081
2082                 # If this is another user's talk page, update newtalk.
2083                 # Don't do this if $options['changed'] = false (null-edits) nor if
2084                 # it's a minor edit and the user doesn't want notifications for those.
2085                 if ( $options['changed']
2086                         && $this->mTitle->getNamespace() == NS_USER_TALK
2087                         && $shortTitle != $user->getTitleKey()
2088                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2089                 ) {
2090                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2091                                 $other = User::newFromName( $shortTitle, false );
2092                                 if ( !$other ) {
2093                                         wfDebug( __METHOD__ . ": invalid username\n" );
2094                                 } elseif ( User::isIP( $shortTitle ) ) {
2095                                         // An anonymous user
2096                                         $other->setNewtalk( true );
2097                                 } elseif ( $other->isLoggedIn() ) {
2098                                         $other->setNewtalk( true );
2099                                 } else {
2100                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2101                                 }
2102                         }
2103                 }
2104
2105                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2106                         MessageCache::singleton()->replace( $shortTitle, $text );
2107                 }
2108
2109                 if( $options['created'] ) {
2110                         self::onArticleCreate( $this->mTitle );
2111                 } else {
2112                         self::onArticleEdit( $this->mTitle );
2113                 }
2114
2115                 wfProfileOut( __METHOD__ );
2116         }
2117
2118         /**
2119          * Perform article updates on a special page creation.
2120          *
2121          * @param $rev Revision object
2122          *
2123          * @todo This is a shitty interface function. Kill it and replace the
2124          * other shitty functions like doEditUpdates and such so it's not needed
2125          * anymore.
2126          * @deprecated since 1.18, use doEditUpdates()
2127          */
2128         public function createUpdates( $rev ) {
2129                 global $wgUser;
2130                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2131         }
2132
2133         /**
2134          * This function is called right before saving the wikitext,
2135          * so we can do things like signatures and links-in-context.
2136          *
2137          * @param $text String article contents
2138          * @param $user User object: user doing the edit
2139          * @param $popts ParserOptions object: parser options, default options for
2140          *               the user loaded if null given
2141          * @return string article contents with altered wikitext markup (signatures
2142          *      converted, {{subst:}}, templates, etc.)
2143          */
2144         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2145                 global $wgParser, $wgUser;
2146                 $user = is_null( $user ) ? $wgUser : $user;
2147
2148                 if ( $popts === null ) {
2149                         $popts = ParserOptions::newFromUser( $user );
2150                 }
2151
2152                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2153         }
2154
2155         /**
2156          * Loads page_touched and returns a value indicating if it should be used
2157          * @return boolean true if not a redirect
2158          */
2159         public function checkTouched() {
2160                 if ( !$this->mDataLoaded ) {
2161                         $this->loadPageData();
2162                 }
2163                 return !$this->mIsRedirect;
2164         }
2165
2166         /**
2167          * Get the page_touched field
2168          * @return string containing GMT timestamp
2169          */
2170         public function getTouched() {
2171                 if ( !$this->mDataLoaded ) {
2172                         $this->loadPageData();
2173                 }
2174                 return $this->mTouched;
2175         }
2176
2177         /**
2178          * Get the page_latest field
2179          * @return integer rev_id of current revision
2180          */
2181         public function getLatest() {
2182                 if ( !$this->mDataLoaded ) {
2183                         $this->loadPageData();
2184                 }
2185                 return (int)$this->mLatest;
2186         }
2187
2188         /**
2189          * Edit an article without doing all that other stuff
2190          * The article must already exist; link tables etc
2191          * are not updated, caches are not flushed.
2192          *
2193          * @param $text String: text submitted
2194          * @param $user User The relevant user
2195          * @param $comment String: comment submitted
2196          * @param $minor Boolean: whereas it's a minor modification
2197          */
2198         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2199                 wfProfileIn( __METHOD__ );
2200
2201                 $dbw = wfGetDB( DB_MASTER );
2202                 $revision = new Revision( array(
2203                         'page'       => $this->getId(),
2204                         'text'       => $text,
2205                         'comment'    => $comment,
2206                         'minor_edit' => $minor ? 1 : 0,
2207                 ) );
2208                 $revision->insertOn( $dbw );
2209                 $this->updateRevisionOn( $dbw, $revision );
2210
2211                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2212
2213                 wfProfileOut( __METHOD__ );
2214         }
2215
2216         /**
2217          * The onArticle*() functions are supposed to be a kind of hooks
2218          * which should be called whenever any of the specified actions
2219          * are done.
2220          *
2221          * This is a good place to put code to clear caches, for instance.
2222          *
2223          * This is called on page move and undelete, as well as edit
2224          *
2225          * @param $title Title object
2226          */
2227         public static function onArticleCreate( $title ) {
2228                 # Update existence markers on article/talk tabs...
2229                 if ( $title->isTalkPage() ) {
2230                         $other = $title->getSubjectPage();
2231                 } else {
2232                         $other = $title->getTalkPage();
2233                 }
2234
2235                 $other->invalidateCache();
2236                 $other->purgeSquid();
2237
2238                 $title->touchLinks();
2239                 $title->purgeSquid();
2240                 $title->deleteTitleProtection();
2241
2242                 # Invalidate caches of distant articles which transclude this page
2243                 DeferredUpdates::addHTMLCacheUpdate( $title, 'globaltemplatelinks' );
2244         }
2245
2246         /**
2247          * Clears caches when article is deleted
2248          *
2249          * @param $title Title
2250          */
2251         public static function onArticleDelete( $title ) {
2252                 # Update existence markers on article/talk tabs...
2253                 if ( $title->isTalkPage() ) {
2254                         $other = $title->getSubjectPage();
2255                 } else {
2256                         $other = $title->getTalkPage();
2257                 }
2258
2259                 $other->invalidateCache();
2260                 $other->purgeSquid();
2261
2262                 $title->touchLinks();
2263                 $title->purgeSquid();
2264
2265                 # File cache
2266                 HTMLFileCache::clearFileCache( $title );
2267
2268                 # Messages
2269                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2270                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2271                 }
2272
2273                 # Images
2274                 if ( $title->getNamespace() == NS_FILE ) {
2275                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2276                         $update->doUpdate();
2277                 }
2278
2279                 # User talk pages
2280                 if ( $title->getNamespace() == NS_USER_TALK ) {
2281                         $user = User::newFromName( $title->getText(), false );
2282                         $user->setNewtalk( false );
2283                 }
2284
2285                 # Image redirects
2286                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2287
2288                 # Invalidate caches of distant articles which transclude this page
2289                 DeferredUpdates::addHTMLCacheUpdate( $title, 'globaltemplatelinks' );
2290         }
2291
2292         /**
2293          * Purge caches on page update etc
2294          *
2295          * @param $title Title object
2296          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2297          */
2298         public static function onArticleEdit( $title ) {
2299                 // Invalidate caches of articles which include this page
2300                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2301
2302                 // Invalidate caches of distant articles which transclude this page
2303                 DeferredUpdates::addHTMLCacheUpdate( $title, 'globaltemplatelinks' );
2304
2305                 // Invalidate the caches of all pages which redirect here
2306                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2307
2308                 # Purge squid for this page only
2309                 $title->purgeSquid();
2310
2311                 # Clear file cache for this page only
2312                 HTMLFileCache::clearFileCache( $title );
2313         }
2314
2315         /**#@-*/
2316
2317         /**
2318          * Return a list of templates used by this article.
2319          * Uses the templatelinks table
2320          *
2321          * @return Array of Title objects
2322          */
2323         public function getUsedTemplates() {
2324                 $result = array();
2325                 $id = $this->mTitle->getArticleID();
2326
2327                 if ( $id == 0 ) {
2328                         return array();
2329                 }
2330
2331                 $dbr = wfGetDB( DB_SLAVE );
2332                 $res = $dbr->select( array( 'templatelinks' ),
2333                         array( 'tl_namespace', 'tl_title' ),
2334                         array( 'tl_from' => $id ),
2335                         __METHOD__ );
2336
2337                 if ( $res !== false ) {
2338                         foreach ( $res as $row ) {
2339                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2340                         }
2341                 }
2342
2343                 return $result;
2344         }
2345
2346         /**
2347          * Return a list of distant templates used by this article.
2348          * Uses the globaltemplatelinks table
2349          *
2350          * @return Array of Title objects
2351          */
2352         public function getUsedDistantTemplates() {
2353                 global $wgGlobalDatabase;
2354
2355                 $result = array();
2356
2357                 if ( $wgGlobalDatabase ) {
2358                         $id = $this->mTitle->getArticleID();
2359
2360                         if ( $id == 0 ) {
2361                                 return array();
2362                         }
2363
2364                         $dbr = wfGetDB( DB_SLAVE, array(), $wgGlobalDatabase );
2365                         $res = $dbr->select( 'globaltemplatelinks',
2366                                 array( 'gtl_to_prefix', 'gtl_to_namespace', 'gtl_to_title' ),
2367                                 array( 'gtl_from_wiki' => wfWikiID( ), 'gtl_from_page' => $id ),
2368                                 __METHOD__ );
2369
2370                         if ( $res !== false ) {
2371                                 foreach ( $res as $row ) {
2372                                         $result[] = Title::makeTitle( $row->gtl_to_namespace, $row->gtl_to_title, null, $row->gtl_to_prefix );
2373                                 }
2374                         }
2375                 }
2376
2377                 return $result;
2378         }
2379
2380         /**
2381          * Returns a list of hidden categories this page is a member of.
2382          * Uses the page_props and categorylinks tables.
2383          *
2384          * @return Array of Title objects
2385          */
2386         public function getHiddenCategories() {
2387                 $result = array();
2388                 $id = $this->mTitle->getArticleID();
2389
2390                 if ( $id == 0 ) {
2391                         return array();
2392                 }
2393
2394                 $dbr = wfGetDB( DB_SLAVE );
2395                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2396                         array( 'cl_to' ),
2397                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2398                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2399                         __METHOD__ );
2400
2401                 if ( $res !== false ) {
2402                         foreach ( $res as $row ) {
2403                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2404                         }
2405                 }
2406
2407                 return $result;
2408         }
2409
2410         /**
2411         * Return an applicable autosummary if one exists for the given edit.
2412         * @param $oldtext String: the previous text of the page.
2413         * @param $newtext String: The submitted text of the page.
2414         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2415         * @return string An appropriate autosummary, or an empty string.
2416         */
2417         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2418                 global $wgContLang;
2419
2420                 # Decide what kind of autosummary is needed.
2421
2422                 # Redirect autosummaries
2423                 $ot = Title::newFromRedirect( $oldtext );
2424                 $rt = Title::newFromRedirect( $newtext );
2425
2426                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2427                         $truncatedtext = $wgContLang->truncate(
2428                                 str_replace( "\n", ' ', $newtext ),
2429                                 max( 0, 250
2430                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2431                                         - strlen( $rt->getFullText() )
2432                                 ) );
2433                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2434                 }
2435
2436                 # New page autosummaries
2437                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2438                         # If they're making a new article, give its text, truncated, in the summary.
2439
2440                         $truncatedtext = $wgContLang->truncate(
2441                                 str_replace( "\n", ' ', $newtext ),
2442                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2443
2444                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2445                 }
2446
2447                 # Blanking autosummaries
2448                 if ( $oldtext != '' && $newtext == '' ) {
2449                         return wfMsgForContent( 'autosumm-blank' );
2450                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2451                         # Removing more than 90% of the article
2452
2453                         $truncatedtext = $wgContLang->truncate(
2454                                 $newtext,
2455                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2456
2457                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2458                 }
2459
2460                 # If we reach this point, there's no applicable autosummary for our case, so our
2461                 # autosummary is empty.
2462                 return '';
2463         }
2464
2465         /**
2466          * Auto-generates a deletion reason
2467          *
2468          * @param &$hasHistory Boolean: whether the page has a history
2469          * @return mixed String containing deletion reason or empty string, or boolean false
2470          *    if no revision occurred
2471          */
2472         public function getAutoDeleteReason( &$hasHistory ) {
2473                 global $wgContLang;
2474
2475                 $dbw = wfGetDB( DB_MASTER );
2476                 // Get the last revision
2477                 $rev = Revision::newFromTitle( $this->getTitle() );
2478
2479                 if ( is_null( $rev ) ) {
2480                         return false;
2481                 }
2482
2483                 // Get the article's contents
2484                 $contents = $rev->getText();
2485                 $blank = false;
2486
2487                 // If the page is blank, use the text from the previous revision,
2488                 // which can only be blank if there's a move/import/protect dummy revision involved
2489                 if ( $contents == '' ) {
2490                         $prev = $rev->getPrevious();
2491
2492                         if ( $prev )    {
2493                                 $contents = $prev->getText();
2494                                 $blank = true;
2495                         }
2496                 }
2497
2498                 // Find out if there was only one contributor
2499                 // Only scan the last 20 revisions
2500                 $res = $dbw->select( 'revision', 'rev_user_text',
2501                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2502                         __METHOD__,
2503                         array( 'LIMIT' => 20 )
2504                 );
2505
2506                 if ( $res === false ) {
2507                         // This page has no revisions, which is very weird
2508                         return false;
2509                 }
2510
2511                 $hasHistory = ( $res->numRows() > 1 );
2512                 $row = $dbw->fetchObject( $res );
2513
2514                 if ( $row ) { // $row is false if the only contributor is hidden
2515                         $onlyAuthor = $row->rev_user_text;
2516                         // Try to find a second contributor
2517                         foreach ( $res as $row ) {
2518                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2519                                         $onlyAuthor = false;
2520                                         break;
2521                                 }
2522                         }
2523                 } else {
2524                         $onlyAuthor = false;
2525                 }
2526
2527                 // Generate the summary with a '$1' placeholder
2528                 if ( $blank ) {
2529                         // The current revision is blank and the one before is also
2530                         // blank. It's just not our lucky day
2531                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2532                 } else {
2533                         if ( $onlyAuthor ) {
2534                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2535                         } else {
2536                                 $reason = wfMsgForContent( 'excontent', '$1' );
2537                         }
2538                 }
2539
2540                 if ( $reason == '-' ) {
2541                         // Allow these UI messages to be blanked out cleanly
2542                         return '';
2543                 }
2544
2545                 // Replace newlines with spaces to prevent uglyness
2546                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2547                 // Calculate the maximum amount of chars to get
2548                 // Max content length = max comment length - length of the comment (excl. $1)
2549                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2550                 $contents = $wgContLang->truncate( $contents, $maxLength );
2551                 // Remove possible unfinished links
2552                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2553                 // Now replace the '$1' placeholder
2554                 $reason = str_replace( '$1', $contents, $reason );
2555
2556                 return $reason;
2557         }
2558
2559         /**
2560          * Get parser options suitable for rendering the primary article wikitext
2561          * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
2562          * @return mixed ParserOptions object or boolean false
2563          */
2564         public function getParserOptions( $canonical = false ) {
2565                 global $wgUser;
2566
2567                 if ( !$this->mParserOptions || $canonical ) {
2568                         $user = !$canonical ? $wgUser : new User;
2569                         $parserOptions = new ParserOptions( $user );
2570                         $parserOptions->setTidy( true );
2571                         $parserOptions->enableLimitReport();
2572
2573                         if ( $canonical ) {
2574                                 $parserOptions->setUserLang( $this->mTitle->getPageLanguage() ); # Must be set explicitely
2575                                 return $parserOptions;
2576                         }
2577                         $this->mParserOptions = $parserOptions;
2578                 }
2579                 // Clone to allow modifications of the return value without affecting cache
2580                 return clone $this->mParserOptions;
2581         }
2582
2583         /**
2584         * Get parser options suitable for rendering the primary article wikitext
2585         * @param User $user
2586         * @return ParserOptions
2587         */
2588         public function makeParserOptions( User $user ) {
2589                 $options = ParserOptions::newFromUser( $user );
2590                 $options->enableLimitReport(); // show inclusion/loop reports
2591                 $options->setTidy( true ); // fix bad HTML
2592                 return $options;
2593         }
2594
2595         /**
2596          * Update all the appropriate counts in the category table, given that
2597          * we've added the categories $added and deleted the categories $deleted.
2598          *
2599          * @param $added array   The names of categories that were added
2600          * @param $deleted array The names of categories that were deleted
2601          */
2602         public function updateCategoryCounts( $added, $deleted ) {
2603                 $ns = $this->mTitle->getNamespace();
2604                 $dbw = wfGetDB( DB_MASTER );
2605
2606                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2607                 # exist, we might legitimately not create it, but it's simpler to just
2608                 # create it and then give it a negative value, since the value is bogus
2609                 # anyway.
2610                 #
2611                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2612                 $insertCats = array_merge( $added, $deleted );
2613                 if ( !$insertCats ) {
2614                         # Okay, nothing to do
2615                         return;
2616                 }
2617
2618                 $insertRows = array();
2619
2620                 foreach ( $insertCats as $cat ) {
2621                         $insertRows[] = array(
2622                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2623                                 'cat_title' => $cat
2624                         );
2625                 }
2626                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2627
2628                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2629                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2630
2631                 if ( $ns == NS_CATEGORY ) {
2632                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2633                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2634                 } elseif ( $ns == NS_FILE ) {
2635                         $addFields[]    = 'cat_files = cat_files + 1';
2636                         $removeFields[] = 'cat_files = cat_files - 1';
2637                 }
2638
2639                 if ( $added ) {
2640                         $dbw->update(
2641                                 'category',
2642                                 $addFields,
2643                                 array( 'cat_title' => $added ),
2644                                 __METHOD__
2645                         );
2646                 }
2647
2648                 if ( $deleted ) {
2649                         $dbw->update(
2650                                 'category',
2651                                 $removeFields,
2652                                 array( 'cat_title' => $deleted ),
2653                                 __METHOD__
2654                         );
2655                 }
2656         }
2657
2658         /**
2659          * Updates cascading protections
2660          *
2661          * @param $parserOutput ParserOutput object for the current version
2662          **/
2663         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2664                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2665                         return;
2666                 }
2667
2668                 // templatelinks table may have become out of sync,
2669                 // especially if using variable-based transclusions.
2670                 // For paranoia, check if things have changed and if
2671                 // so apply updates to the database. This will ensure
2672                 // that cascaded protections apply as soon as the changes
2673                 // are visible.
2674
2675                 # Get templates from templatelinks
2676                 $id = $this->mTitle->getArticleID();
2677
2678                 $tlTemplates = array();
2679
2680                 $dbr = wfGetDB( DB_SLAVE );
2681                 $res = $dbr->select( array( 'templatelinks' ),
2682                         array( 'tl_namespace', 'tl_title' ),
2683                         array( 'tl_from' => $id ),
2684                         __METHOD__
2685                 );
2686
2687                 foreach ( $res as $row ) {
2688                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2689                 }
2690
2691                 # Get templates from parser output.
2692                 $poTemplates = array();
2693                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2694                         foreach ( $templates as $dbk => $id ) {
2695                                 $poTemplates["$ns:$dbk"] = true;
2696                         }
2697                 }
2698
2699                 # Get the diff
2700                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2701
2702                 if ( count( $templates_diff ) > 0 ) {
2703                         # Whee, link updates time.
2704                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2705                         $u->doUpdate();
2706                 }
2707         }
2708
2709         /*
2710         * @deprecated since 1.18
2711         */
2712         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2713                 global $wgUser;
2714                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2715         }
2716
2717         /*
2718         * @deprecated since 1.18
2719         */
2720         public function viewUpdates() {
2721                 global $wgUser;
2722                 return $this->doViewUpdates( $wgUser );
2723         }
2724
2725         /*
2726         * @deprecated since 1.18
2727         */
2728         public function useParserCache( $oldid ) {
2729                 global $wgUser;
2730                 return $this->isParserCacheUsed( $wgUser, $oldid );
2731         }
2732 }