includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  * @internal documentation reviewed 15 Mar 2010
  15  */
  16 class Article {
  17         /**@{{
  18          * @private
  19          */
  20         protected $mContext;              // !< RequestContext
  21
  22         var $mContent;                    // !<
  23         var $mContentLoaded = false;      // !<
  24         var $mCounter = -1;               // !< Not loaded
  25         var $mDataLoaded = false;         // !<
  26         var $mForUpdate = false;          // !<
  27         var $mGoodAdjustment = 0;         // !<
  28         var $mIsRedirect = false;         // !<
  29         var $mLatest = false;             // !<
  30         var $mOldId;                      // !<
  31         var $mPreparedEdit = false;       // !< Title object if set
  32         var $mRedirectedFrom = null;      // !< Title object if set
  33         var $mRedirectTarget = null;      // !< Title object if set
  34         var $mRedirectUrl = false;        // !<
  35         var $mRevIdFetched = 0;           // !<
  36         var $mLastRevision = null;                // !< Latest revision if set
  37         var $mRevision = null;            // !< Loaded revision object if set
  38         var $mTimestamp = '';             // !<
  39         var $mTitle;                      // !< Title object
  40         var $mTotalAdjustment = 0;        // !<
  41         var $mTouched = '19700101000000'; // !<
  42         var $mParserOptions;              // !< ParserOptions object
  43         var $mParserOutput;               // !< ParserCache object if set
  44         /**@}}*/
  45
  46         /**
  47          * Constructor and clear the article
  48          * @param $title Reference to a Title object.
  49          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  50          */
  51         public function __construct( Title $title, $oldId = null ) {
  52                 // FIXME: does the reference play any role here?
  53                 $this->mTitle =& $title;
  54                 $this->mOldId = $oldId;
  55         }
  56
  57         /**
  58          * Constructor from an page id
  59          * @param $id Int article ID to load
  60          */
  61         public static function newFromID( $id ) {
  62                 $t = Title::newFromID( $id );
  63                 # FIXME: doesn't inherit right
  64                 return $t == null ? null : new self( $t );
  65                 # return $t == null ? null : new static( $t ); // PHP 5.3
  66         }
  67
  68         /**
  69          * Tell the page view functions that this view was redirected
  70          * from another page on the wiki.
  71          * @param $from Title object.
  72          */
  73         public function setRedirectedFrom( Title $from ) {
  74                 $this->mRedirectedFrom = $from;
  75         }
  76
  77         /**
  78          * If this page is a redirect, get its target
  79          *
  80          * The target will be fetched from the redirect table if possible.
  81          * If this page doesn't have an entry there, call insertRedirect()
  82          * @return mixed Title object, or null if this page is not a redirect
  83          */
  84         public function getRedirectTarget() {
  85                 if ( !$this->mTitle->isRedirect() ) {
  86                         return null;
  87                 }
  88
  89                 if ( $this->mRedirectTarget !== null ) {
  90                         return $this->mRedirectTarget;
  91                 }
  92
  93                 # Query the redirect table
  94                 $dbr = wfGetDB( DB_SLAVE );
  95                 $row = $dbr->selectRow( 'redirect',
  96                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  97                         array( 'rd_from' => $this->getID() ),
  98                         __METHOD__
  99                 );
 100
 101                 // rd_fragment and rd_interwiki were added later, populate them if empty
 102                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 103                         return $this->mRedirectTarget = Title::makeTitle(
 104                                 $row->rd_namespace, $row->rd_title,
 105                                 $row->rd_fragment, $row->rd_interwiki );
 106                 }
 107
 108                 # This page doesn't have an entry in the redirect table
 109                 return $this->mRedirectTarget = $this->insertRedirect();
 110         }
 111
 112         /**
 113          * Insert an entry for this page into the redirect table.
 114          *
 115          * Don't call this function directly unless you know what you're doing.
 116          * @return Title object or null if not a redirect
 117          */
 118         public function insertRedirect() {
 119                 // recurse through to only get the final target
 120                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 121                 if ( !$retval ) {
 122                         return null;
 123                 }
 124                 $this->insertRedirectEntry( $retval );
 125                 return $retval;
 126         }
 127
 128         /**
 129          * Insert or update the redirect table entry for this page to indicate
 130          * it redirects to $rt .
 131          * @param $rt Title redirect target
 132          */
 133         public function insertRedirectEntry( $rt ) {
 134                 $dbw = wfGetDB( DB_MASTER );
 135                 $dbw->replace( 'redirect', array( 'rd_from' ),
 136                         array(
 137                                 'rd_from' => $this->getID(),
 138                                 'rd_namespace' => $rt->getNamespace(),
 139                                 'rd_title' => $rt->getDBkey(),
 140                                 'rd_fragment' => $rt->getFragment(),
 141                                 'rd_interwiki' => $rt->getInterwiki(),
 142                         ),
 143                         __METHOD__
 144                 );
 145         }
 146
 147         /**
 148          * Get the Title object or URL this page redirects to
 149          *
 150          * @return mixed false, Title of in-wiki target, or string with URL
 151          */
 152         public function followRedirect() {
 153                 return $this->getRedirectURL( $this->getRedirectTarget() );
 154         }
 155
 156         /**
 157          * Get the Title object this text redirects to
 158          *
 159          * @param $text string article content containing redirect info
 160          * @return mixed false, Title of in-wiki target, or string with URL
 161          * @deprecated since 1.17
 162          */
 163         public function followRedirectText( $text ) {
 164                 // recurse through to only get the final target
 165                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 166         }
 167
 168         /**
 169          * Get the Title object or URL to use for a redirect. We use Title
 170          * objects for same-wiki, non-special redirects and URLs for everything
 171          * else.
 172          * @param $rt Title Redirect target
 173          * @return mixed false, Title object of local target, or string with URL
 174          */
 175         public function getRedirectURL( $rt ) {
 176                 if ( $rt ) {
 177                         if ( $rt->getInterwiki() != '' ) {
 178                                 if ( $rt->isLocal() ) {
 179                                         // Offsite wikis need an HTTP redirect.
 180                                         //
 181                                         // This can be hard to reverse and may produce loops,
 182                                         // so they may be disabled in the site configuration.
 183                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 184                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 185                                 }
 186                         } else {
 187                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 188                                         // Gotta handle redirects to special pages differently:
 189                                         // Fill the HTTP response "Location" header and ignore
 190                                         // the rest of the page we're on.
 191                                         //
 192                                         // This can be hard to reverse, so they may be disabled.
 193                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 194                                                 // rolleyes
 195                                         } else {
 196                                                 return $rt->getFullURL();
 197                                         }
 198                                 }
 199
 200                                 return $rt;
 201                         }
 202                 }
 203
 204                 // No or invalid redirect
 205                 return false;
 206         }
 207
 208         /**
 209          * Get the title object of the article
 210          * @return Title object of this page
 211          */
 212         public function getTitle() {
 213                 return $this->mTitle;
 214         }
 215
 216         /**
 217          * Clear the object
 218          * FIXME: shouldn't this be public?
 219          * @private
 220          */
 221         public function clear() {
 222                 $this->mDataLoaded    = false;
 223                 $this->mContentLoaded = false;
 224
 225                 $this->mCounter = -1; # Not loaded
 226                 $this->mRedirectedFrom = null; # Title object if set
 227                 $this->mRedirectTarget = null; # Title object if set
 228                 $this->mLastRevision = null; # Latest revision
 229                 $this->mTimestamp = '';
 230                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 231                 $this->mTouched = '19700101000000';
 232                 $this->mForUpdate = false;
 233                 $this->mIsRedirect = false;
 234                 $this->mRevIdFetched = 0;
 235                 $this->mRedirectUrl = false;
 236                 $this->mLatest = false;
 237                 $this->mPreparedEdit = false;
 238         }
 239
 240         /**
 241          * Note that getContent/loadContent do not follow redirects anymore.
 242          * If you need to fetch redirectable content easily, try
 243          * the shortcut in Article::followRedirect()
 244          *
 245          * This function has side effects! Do not use this function if you
 246          * only want the real revision text if any.
 247          *
 248          * @return Return the text of this revision
 249          */
 250         public function getContent() {
 251                 global $wgUser;
 252
 253                 wfProfileIn( __METHOD__ );
 254
 255                 if ( $this->getID() === 0 ) {
 256                         # If this is a MediaWiki:x message, then load the messages
 257                         # and return the message value for x.
 258                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 259                                 $text = $this->mTitle->getDefaultMessageText();
 260                                 if ( $text === false ) {
 261                                         $text = '';
 262                                 }
 263                         } else {
 264                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 265                         }
 266                         wfProfileOut( __METHOD__ );
 267
 268                         return $text;
 269                 } else {
 270                         $this->loadContent();
 271                         wfProfileOut( __METHOD__ );
 272
 273                         return $this->mContent;
 274                 }
 275         }
 276
 277         /**
 278          * Get the text of the current revision. No side-effects...
 279          *
 280          * @return Return the text of the current revision
 281          */
 282         public function getRawText() {
 283                 // Check process cache for current revision
 284                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 285                         return $this->mContent;
 286                 }
 287
 288                 $rev = Revision::newFromTitle( $this->mTitle );
 289                 $text = $rev ? $rev->getRawText() : false;
 290
 291                 return $text;
 292         }
 293
 294         /**
 295          * This function returns the text of a section, specified by a number ($section).
 296          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 297          * the first section before any such heading (section 0).
 298          *
 299          * If a section contains subsections, these are also returned.
 300          *
 301          * @param $text String: text to look in
 302          * @param $section Integer: section number
 303          * @return string text of the requested section
 304          * @deprecated
 305          */
 306         public function getSection( $text, $section ) {
 307                 global $wgParser;
 308                 return $wgParser->getSection( $text, $section );
 309         }
 310
 311         /**
 312          * Get the text that needs to be saved in order to undo all revisions
 313          * between $undo and $undoafter. Revisions must belong to the same page,
 314          * must exist and must not be deleted
 315          * @param $undo Revision
 316          * @param $undoafter Revision Must be an earlier revision than $undo
 317          * @return mixed string on success, false on failure
 318          */
 319         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 320                 $currentRev = Revision::newFromTitle( $this->mTitle );
 321                 if ( !$currentRev ) {
 322                         return false; // no page
 323                 }
 324                 $undo_text = $undo->getText();
 325                 $undoafter_text = $undoafter->getText();
 326                 $cur_text = $currentRev->getText();
 327
 328                 if ( $cur_text == $undo_text ) {
 329                         # No use doing a merge if it's just a straight revert.
 330                         return $undoafter_text;
 331                 }
 332
 333                 $undone_text = '';
 334
 335                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 336                         return false;
 337                 }
 338
 339                 return $undone_text;
 340         }
 341
 342         /**
 343          * @return int The oldid of the article that is to be shown, 0 for the
 344          *             current revision
 345          */
 346         public function getOldID() {
 347                 if ( is_null( $this->mOldId ) ) {
 348                         $this->mOldId = $this->getOldIDFromRequest();
 349                 }
 350
 351                 return $this->mOldId;
 352         }
 353
 354         /**
 355          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 356          *
 357          * @return int The old id for the request
 358          */
 359         public function getOldIDFromRequest() {
 360                 global $wgRequest;
 361
 362                 $this->mRedirectUrl = false;
 363
 364                 $oldid = $wgRequest->getVal( 'oldid' );
 365
 366                 if ( isset( $oldid ) ) {
 367                         $oldid = intval( $oldid );
 368                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 369                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 370                                 if ( $nextid ) {
 371                                         $oldid = $nextid;
 372                                 } else {
 373                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 374                                 }
 375                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 376                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 377                                 if ( $previd ) {
 378                                         $oldid = $previd;
 379                                 }
 380                         }
 381                 }
 382
 383                 if ( !$oldid ) {
 384                         $oldid = 0;
 385                 }
 386
 387                 return $oldid;
 388         }
 389
 390         /**
 391          * Load the revision (including text) into this object
 392          */
 393         function loadContent() {
 394                 if ( $this->mContentLoaded ) {
 395                         return;
 396                 }
 397
 398                 wfProfileIn( __METHOD__ );
 399
 400                 $this->fetchContent( $this->getOldID() );
 401
 402                 wfProfileOut( __METHOD__ );
 403         }
 404
 405         /**
 406          * Return the list of revision fields that should be selected to create
 407          * a new page.
 408          */
 409         public static function selectFields() {
 410                 return array(
 411                         'page_id',
 412                         'page_namespace',
 413                         'page_title',
 414                         'page_restrictions',
 415                         'page_counter',
 416                         'page_is_redirect',
 417                         'page_is_new',
 418                         'page_random',
 419                         'page_touched',
 420                         'page_latest',
 421                         'page_len',
 422                 );
 423         }
 424
 425         /**
 426          * Fetch a page record with the given conditions
 427          * @param $dbr Database object
 428          * @param $conditions Array
 429          * @return mixed Database result resource, or false on failure
 430          */
 431         protected function pageData( $dbr, $conditions ) {
 432                 $fields = self::selectFields();
 433
 434                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 435
 436                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 437
 438                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 439
 440                 return $row;
 441         }
 442
 443         /**
 444          * Fetch a page record matching the Title object's namespace and title
 445          * using a sanitized title string
 446          *
 447          * @param $dbr Database object
 448          * @param $title Title object
 449          * @return mixed Database result resource, or false on failure
 450          */
 451         protected function pageDataFromTitle( $dbr, $title ) {
 452                 return $this->pageData( $dbr, array(
 453                         'page_namespace' => $title->getNamespace(),
 454                         'page_title'     => $title->getDBkey() ) );
 455         }
 456
 457         /**
 458          * Fetch a page record matching the requested ID
 459          *
 460          * @param $dbr Database
 461          * @param $id Integer
 462          * @return mixed Database result resource, or false on failure
 463          */
 464         protected function pageDataFromId( $dbr, $id ) {
 465                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 466         }
 467
 468         /**
 469          * Set the general counter, title etc data loaded from
 470          * some source.
 471          *
 472          * @param $data Database row object or "fromdb"
 473          */
 474         public function loadPageData( $data = 'fromdb' ) {
 475                 if ( $data === 'fromdb' ) {
 476                         $dbr = wfGetDB( DB_SLAVE );
 477                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 478                 }
 479
 480                 $lc = LinkCache::singleton();
 481
 482                 if ( $data ) {
 483                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 484
 485                         $this->mTitle->mArticleID = intval( $data->page_id );
 486
 487                         # Old-fashioned restrictions
 488                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 489
 490                         $this->mCounter     = intval( $data->page_counter );
 491                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 492                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 493                         $this->mLatest      = intval( $data->page_latest );
 494                 } else {
 495                         $lc->addBadLinkObj( $this->mTitle );
 496                         $this->mTitle->mArticleID = 0;
 497                 }
 498
 499                 $this->mDataLoaded = true;
 500         }
 501
 502         /**
 503          * Get text of an article from database
 504          * Does *NOT* follow redirects.
 505          *
 506          * @param $oldid Int: 0 for whatever the latest revision is
 507          * @return mixed string containing article contents, or false if null
 508          */
 509         function fetchContent( $oldid = 0 ) {
 510                 if ( $this->mContentLoaded ) {
 511                         return $this->mContent;
 512                 }
 513
 514                 # Pre-fill content with error message so that if something
 515                 # fails we'll have something telling us what we intended.
 516                 $t = $this->mTitle->getPrefixedText();
 517                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 518                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 519
 520                 if ( $oldid ) {
 521                         $revision = Revision::newFromId( $oldid );
 522                         if ( $revision === null ) {
 523                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 524                                 return false;
 525                         }
 526
 527                         if ( !$this->mDataLoaded || $this->getID() != $revision->getPage() ) {
 528                                 $data = $this->pageDataFromId( wfGetDB( DB_SLAVE ), $revision->getPage() );
 529
 530                                 if ( !$data ) {
 531                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 532                                         return false;
 533                                 }
 534
 535                                 $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 536                                 $this->loadPageData( $data );
 537                         }
 538                 } else {
 539                         if ( !$this->mDataLoaded ) {
 540                                 $this->loadPageData();
 541                         }
 542
 543                         if ( $this->mLatest === false ) {
 544                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 545                                 return false;
 546                         }
 547
 548                         $revision = Revision::newFromId( $this->mLatest );
 549                         if ( $revision === null ) {
 550                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 551                                 return false;
 552                         }
 553                 }
 554
 555                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 556                 // We should instead work with the Revision object when we need it...
 557                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 558
 559                 if ( $revision->getId() == $this->mLatest ) {
 560                         $this->setLastEdit( $revision );
 561                 }
 562
 563                 $this->mRevIdFetched = $revision->getId();
 564                 $this->mContentLoaded = true;
 565                 $this->mRevision =& $revision;
 566
 567                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 568
 569                 return $this->mContent;
 570         }
 571
 572         /**
 573          * Read/write accessor to select FOR UPDATE
 574          *
 575          * @param $x Mixed: FIXME
 576          * @return mixed value of $x, or value stored in Article::mForUpdate
 577          */
 578         public function forUpdate( $x = null ) {
 579                 return wfSetVar( $this->mForUpdate, $x );
 580         }
 581
 582         /**
 583          * Get options for all SELECT statements
 584          *
 585          * @param $options Array: an optional options array which'll be appended to
 586          *                       the default
 587          * @return Array: options
 588          */
 589         protected function getSelectOptions( $options = '' ) {
 590                 if ( $this->mForUpdate ) {
 591                         if ( is_array( $options ) ) {
 592                                 $options[] = 'FOR UPDATE';
 593                         } else {
 594                                 $options = 'FOR UPDATE';
 595                         }
 596                 }
 597
 598                 return $options;
 599         }
 600
 601         /**
 602          * @return int Page ID
 603          */
 604         public function getID() {
 605                 return $this->mTitle->getArticleID();
 606         }
 607
 608         /**
 609          * @return bool Whether or not the page exists in the database
 610          */
 611         public function exists() {
 612                 return $this->getId() > 0;
 613         }
 614
 615         /**
 616          * Check if this page is something we're going to be showing
 617          * some sort of sensible content for. If we return false, page
 618          * views (plain action=view) will return an HTTP 404 response,
 619          * so spiders and robots can know they're following a bad link.
 620          *
 621          * @return bool
 622          */
 623         public function hasViewableContent() {
 624                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 625         }
 626
 627         /**
 628          * @return int The view count for the page
 629          */
 630         public function getCount() {
 631                 if ( -1 == $this->mCounter ) {
 632                         $id = $this->getID();
 633
 634                         if ( $id == 0 ) {
 635                                 $this->mCounter = 0;
 636                         } else {
 637                                 $dbr = wfGetDB( DB_SLAVE );
 638                                 $this->mCounter = $dbr->selectField( 'page',
 639                                         'page_counter',
 640                                         array( 'page_id' => $id ),
 641                                         __METHOD__,
 642                                         $this->getSelectOptions()
 643                                 );
 644                         }
 645                 }
 646
 647                 return $this->mCounter;
 648         }
 649
 650         /**
 651          * Determine whether a page would be suitable for being counted as an
 652          * article in the site_stats table based on the title & its content
 653          *
 654          * @param $text String: text to analyze
 655          * @return bool
 656          */
 657         public function isCountable( $text ) {
 658                 global $wgUseCommaCount;
 659
 660                 $token = $wgUseCommaCount ? ',' : '[[';
 661
 662                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 663         }
 664
 665         /**
 666          * Tests if the article text represents a redirect
 667          *
 668          * @param $text mixed string containing article contents, or boolean
 669          * @return bool
 670          */
 671         public function isRedirect( $text = false ) {
 672                 if ( $text === false ) {
 673                         if ( !$this->mDataLoaded ) {
 674                                 $this->loadPageData();
 675                         }
 676
 677                         return (bool)$this->mIsRedirect;
 678                 } else {
 679                         return Title::newFromRedirect( $text ) !== null;
 680                 }
 681         }
 682
 683         /**
 684          * Returns true if the currently-referenced revision is the current edit
 685          * to this page (and it exists).
 686          * @return bool
 687          */
 688         public function isCurrent() {
 689                 # If no oldid, this is the current version.
 690                 if ( $this->getOldID() == 0 ) {
 691                         return true;
 692                 }
 693
 694                 return $this->exists() && $this->mRevision && $this->mRevision->isCurrent();
 695         }
 696
 697         /**
 698          * Loads everything except the text
 699          * This isn't necessary for all uses, so it's only done if needed.
 700          */
 701         protected function loadLastEdit() {
 702                 if ( $this->mLastRevision !== null ) {
 703                         return; // already loaded
 704                 }
 705
 706                 # New or non-existent articles have no user information
 707                 $id = $this->getID();
 708                 if ( 0 == $id ) {
 709                         return;
 710                 }
 711
 712                 $revision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 713                 if ( $revision ) {
 714                         $this->setLastEdit( $revision );
 715                 }
 716         }
 717
 718         /**
 719          * Set the latest revision
 720          */
 721         protected function setLastEdit( Revision $revision ) {
 722                 $this->mLastRevision = $revision;
 723                 $this->mTimestamp = $revision->getTimestamp();
 724         }
 725
 726         /**
 727          * @return string GMT timestamp of last article revision
 728          */
 729         public function getTimestamp() {
 730                 // Check if the field has been filled by ParserCache::get()
 731                 if ( !$this->mTimestamp ) {
 732                         $this->loadLastEdit();
 733                 }
 734                 return wfTimestamp( TS_MW, $this->mTimestamp );
 735         }
 736
 737         /**
 738          * @param $audience Integer: one of:
 739          *      Revision::FOR_PUBLIC       to be displayed to all users
 740          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 741          *      Revision::RAW              get the text regardless of permissions
 742          * @return int user ID for the user that made the last article revision
 743          */
 744         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 745                 $this->loadLastEdit();
 746                 if ( $this->mLastRevision ) {
 747                         return $this->mLastRevision->getUser( $audience );
 748                 } else {
 749                         return -1;
 750                 }
 751         }
 752
 753         /**
 754          * @param $audience Integer: one of:
 755          *      Revision::FOR_PUBLIC       to be displayed to all users
 756          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 757          *      Revision::RAW              get the text regardless of permissions
 758          * @return string username of the user that made the last article revision
 759          */
 760         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 761                 $this->loadLastEdit();
 762                 if ( $this->mLastRevision ) {
 763                         return $this->mLastRevision->getUserText( $audience );
 764                 } else {
 765                         return '';
 766                 }
 767         }
 768
 769         /**
 770          * @param $audience Integer: one of:
 771          *      Revision::FOR_PUBLIC       to be displayed to all users
 772          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 773          *      Revision::RAW              get the text regardless of permissions
 774          * @return string Comment stored for the last article revision
 775          */
 776         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 777                 $this->loadLastEdit();
 778                 if ( $this->mLastRevision ) {
 779                         return $this->mLastRevision->getComment( $audience );
 780                 } else {
 781                         return '';
 782                 }
 783         }
 784
 785         /**
 786          * Returns true if last revision was marked as "minor edit"
 787          *
 788          * @return boolean Minor edit indicator for the last article revision.
 789          */
 790         public function getMinorEdit() {
 791                 $this->loadLastEdit();
 792                 if ( $this->mLastRevision ) {
 793                         return $this->mLastRevision->isMinor();
 794                 } else {
 795                         return false;
 796                 }
 797         }
 798
 799         /**
 800          * Use this to fetch the rev ID used on page views
 801          *
 802          * @return int revision ID of last article revision
 803          */
 804         public function getRevIdFetched() {
 805                 if ( $this->mRevIdFetched ) {
 806                         return $this->mRevIdFetched;
 807                 } else {
 808                         return $this->getLatest();
 809                 }
 810         }
 811
 812         /**
 813          * Get a list of users who have edited this article, not including the user who made
 814          * the most recent revision, which you can get from $article->getUser() if you want it
 815          * @return UserArray
 816          */
 817         public function getContributors() {
 818                 # FIXME: this is expensive; cache this info somewhere.
 819
 820                 $dbr = wfGetDB( DB_SLAVE );
 821                 $userTable = $dbr->tableName( 'user' );
 822
 823                 $tables = array( 'revision', 'user' );
 824
 825                 $fields = array(
 826                         "$userTable.*",
 827                         'rev_user_text AS user_name',
 828                         'MAX(rev_timestamp) AS timestamp',
 829                 );
 830
 831                 $conds = array( 'rev_page' => $this->getId() );
 832
 833                 // The user who made the top revision gets credited as "this page was last edited by
 834                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 835                 $user = $this->getUser();
 836                 if ( $user ) {
 837                         $conds[] = "rev_user != $user";
 838                 } else {
 839                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 840                 }
 841
 842                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 843
 844                 $jconds = array(
 845                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 846                 );
 847
 848                 $options = array(
 849                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 850                         'ORDER BY' => 'timestamp DESC',
 851                 );
 852
 853                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 854                 return new UserArrayFromResult( $res );
 855         }
 856
 857         /**
 858          * This is the default action of the index.php entry point: just view the
 859          * page of the given title.
 860          */
 861         public function view() {
 862                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 863                 global $wgUseFileCache, $wgUseETag;
 864
 865                 wfProfileIn( __METHOD__ );
 866
 867                 # Get variables from query string
 868                 $oldid = $this->getOldID();
 869
 870                 # getOldID may want us to redirect somewhere else
 871                 if ( $this->mRedirectUrl ) {
 872                         $wgOut->redirect( $this->mRedirectUrl );
 873                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 874                         wfProfileOut( __METHOD__ );
 875
 876                         return;
 877                 }
 878
 879                 $wgOut->setArticleFlag( true );
 880                 # Set page title (may be overridden by DISPLAYTITLE)
 881                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 882
 883                 # If we got diff in the query, we want to see a diff page instead of the article.
 884                 if ( $wgRequest->getCheck( 'diff' ) ) {
 885                         wfDebug( __METHOD__ . ": showing diff page\n" );
 886                         $this->showDiffPage();
 887                         wfProfileOut( __METHOD__ );
 888
 889                         return;
 890                 }
 891
 892                 # Allow frames by default
 893                 $wgOut->allowClickjacking();
 894
 895                 $parserCache = ParserCache::singleton();
 896
 897                 $parserOptions = $this->getParserOptions();
 898                 # Render printable version, use printable version cache
 899                 if ( $wgOut->isPrintable() ) {
 900                         $parserOptions->setIsPrintable( true );
 901                         $parserOptions->setEditSection( false );
 902                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 903                         $parserOptions->setEditSection( false );
 904                 }
 905
 906                 # Try client and file cache
 907                 if ( $oldid === 0 && $this->checkTouched() ) {
 908                         if ( $wgUseETag ) {
 909                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 910                         }
 911
 912                         # Is it client cached?
 913                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 914                                 wfDebug( __METHOD__ . ": done 304\n" );
 915                                 wfProfileOut( __METHOD__ );
 916
 917                                 return;
 918                         # Try file cache
 919                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 920                                 wfDebug( __METHOD__ . ": done file cache\n" );
 921                                 # tell wgOut that output is taken care of
 922                                 $wgOut->disable();
 923                                 $this->viewUpdates();
 924                                 wfProfileOut( __METHOD__ );
 925
 926                                 return;
 927                         }
 928                 }
 929
 930                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 931                         $parserOptions->setEditSection( false );
 932                 }
 933
 934                 # Should the parser cache be used?
 935                 $useParserCache = $this->useParserCache( $oldid );
 936                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 937                 if ( $wgUser->getStubThreshold() ) {
 938                         wfIncrStats( 'pcache_miss_stub' );
 939                 }
 940
 941                 $wasRedirected = $this->showRedirectedFromHeader();
 942                 $this->showNamespaceHeader();
 943
 944                 # Iterate through the possible ways of constructing the output text.
 945                 # Keep going until $outputDone is set, or we run out of things to do.
 946                 $pass = 0;
 947                 $outputDone = false;
 948                 $this->mParserOutput = false;
 949
 950                 while ( !$outputDone && ++$pass ) {
 951                         switch( $pass ) {
 952                                 case 1:
 953                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 954                                         break;
 955                                 case 2:
 956                                         # Try the parser cache
 957                                         if ( $useParserCache ) {
 958                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 959
 960                                                 if ( $this->mParserOutput !== false ) {
 961                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 962                                                         $wgOut->addParserOutput( $this->mParserOutput );
 963                                                         # Ensure that UI elements requiring revision ID have
 964                                                         # the correct version information.
 965                                                         $wgOut->setRevisionId( $this->mLatest );
 966                                                         $outputDone = true;
 967                                                 }
 968                                         }
 969                                         break;
 970                                 case 3:
 971                                         $text = $this->getContent();
 972                                         if ( $text === false || $this->getID() == 0 ) {
 973                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 974                                                 $this->showMissingArticle();
 975                                                 wfProfileOut( __METHOD__ );
 976                                                 return;
 977                                         }
 978
 979                                         # Another whitelist check in case oldid is altering the title
 980                                         if ( !$this->mTitle->userCanRead() ) {
 981                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 982                                                 $wgOut->loginToUse();
 983                                                 $wgOut->output();
 984                                                 $wgOut->disable();
 985                                                 wfProfileOut( __METHOD__ );
 986                                                 return;
 987                                         }
 988
 989                                         # Are we looking at an old revision
 990                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 991                                                 $this->setOldSubtitle( $oldid );
 992
 993                                                 if ( !$this->showDeletedRevisionHeader() ) {
 994                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 995                                                         wfProfileOut( __METHOD__ );
 996                                                         return;
 997                                                 }
 998
 999                                                 # If this "old" version is the current, then try the parser cache...
1000                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
1001                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
1002                                                         if ( $this->mParserOutput ) {
1003                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
1004                                                                 $wgOut->addParserOutput( $this->mParserOutput );
1005                                                                 $wgOut->setRevisionId( $this->mLatest );
1006                                                                 $outputDone = true;
1007                                                                 break;
1008                                                         }
1009                                                 }
1010                                         }
1011
1012                                         # Ensure that UI elements requiring revision ID have
1013                                         # the correct version information.
1014                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
1015
1016                                         # Pages containing custom CSS or JavaScript get special treatment
1017                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
1018                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
1019                                                 $this->showCssOrJsPage();
1020                                                 $outputDone = true;
1021                                         } else {
1022                                                 $rt = Title::newFromRedirectArray( $text );
1023                                                 if ( $rt ) {
1024                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
1025                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
1026                                                         # Don't append the subtitle if this was an old revision
1027                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
1028                                                         # Parse just to get categories, displaytitle, etc.
1029                                                         $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
1030                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
1031                                                         $outputDone = true;
1032                                                 }
1033                                         }
1034                                         break;
1035                                 case 4:
1036                                         # Run the parse, protected by a pool counter
1037                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1038
1039                                         $key = $parserCache->getKey( $this, $parserOptions );
1040                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1041
1042                                         if ( !$poolArticleView->execute() ) {
1043                                                 # Connection or timeout error
1044                                                 wfProfileOut( __METHOD__ );
1045                                                 return;
1046                                         } else {
1047                                                 $outputDone = true;
1048                                         }
1049                                         break;
1050                                 # Should be unreachable, but just in case...
1051                                 default:
1052                                         break 2;
1053                         }
1054                 }
1055
1056                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1057                 if ( $this->mParserOutput ) {
1058                         $titleText = $this->mParserOutput->getTitleText();
1059
1060                         if ( strval( $titleText ) !== '' ) {
1061                                 $wgOut->setPageTitle( $titleText );
1062                         }
1063                 }
1064
1065                 # For the main page, overwrite the <title> element with the con-
1066                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1067                 # that's not empty).
1068                 # This message always exists because it is in the i18n files
1069                 if ( $this->mTitle->equals( Title::newMainPage() ) ) {
1070                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
1071                         if ( !$msg->isDisabled() ) {
1072                                 $wgOut->setHTMLTitle( $msg->title( $this->mTitle )->text() );
1073                         }
1074                 }
1075
1076                 # Now that we've filled $this->mParserOutput, we know whether
1077                 # there are any __NOINDEX__ tags on the page
1078                 $policy = $this->getRobotPolicy( 'view' );
1079                 $wgOut->setIndexPolicy( $policy['index'] );
1080                 $wgOut->setFollowPolicy( $policy['follow'] );
1081
1082                 $this->showViewFooter();
1083                 $this->viewUpdates();
1084                 wfProfileOut( __METHOD__ );
1085         }
1086
1087         /**
1088          * Show a diff page according to current request variables. For use within
1089          * Article::view() only, other callers should use the DifferenceEngine class.
1090          */
1091         public function showDiffPage() {
1092                 global $wgRequest, $wgUser;
1093
1094                 $diff = $wgRequest->getVal( 'diff' );
1095                 $rcid = $wgRequest->getVal( 'rcid' );
1096                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1097                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1098                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1099                 $oldid = $this->getOldID();
1100
1101                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1102                 // DifferenceEngine directly fetched the revision:
1103                 $this->mRevIdFetched = $de->mNewid;
1104                 $de->showDiffPage( $diffOnly );
1105
1106                 if ( $diff == 0 || $diff == $this->getLatest() ) {
1107                         # Run view updates for current revision only
1108                         $this->viewUpdates();
1109                 }
1110         }
1111
1112         /**
1113          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1114          * Article::view() only.
1115          *
1116          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1117          * page views.
1118          */
1119         protected function showCssOrJsPage() {
1120                 global $wgOut;
1121
1122                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1123
1124                 // Give hooks a chance to customise the output
1125                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1126                         // Wrap the whole lot in a <pre> and don't parse
1127                         $m = array();
1128                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1129                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1130                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1131                         $wgOut->addHTML( "\n</pre>\n" );
1132                 }
1133         }
1134
1135         /**
1136          * Get the robot policy to be used for the current view
1137          * @param $action String the action= GET parameter
1138          * @return Array the policy that should be set
1139          * TODO: actions other than 'view'
1140          */
1141         public function getRobotPolicy( $action ) {
1142                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1143                 global $wgDefaultRobotPolicy, $wgRequest;
1144
1145                 $ns = $this->mTitle->getNamespace();
1146
1147                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1148                         # Don't index user and user talk pages for blocked users (bug 11443)
1149                         if ( !$this->mTitle->isSubpage() ) {
1150                                 if ( Block::newFromTarget( null, $this->mTitle->getText() ) instanceof Block ) {
1151                                         return array(
1152                                                 'index'  => 'noindex',
1153                                                 'follow' => 'nofollow'
1154                                         );
1155                                 }
1156                         }
1157                 }
1158
1159                 if ( $this->getID() === 0 || $this->getOldID() ) {
1160                         # Non-articles (special pages etc), and old revisions
1161                         return array(
1162                                 'index'  => 'noindex',
1163                                 'follow' => 'nofollow'
1164                         );
1165                 } elseif ( $wgOut->isPrintable() ) {
1166                         # Discourage indexing of printable versions, but encourage following
1167                         return array(
1168                                 'index'  => 'noindex',
1169                                 'follow' => 'follow'
1170                         );
1171                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1172                         # For ?curid=x urls, disallow indexing
1173                         return array(
1174                                 'index'  => 'noindex',
1175                                 'follow' => 'follow'
1176                         );
1177                 }
1178
1179                 # Otherwise, construct the policy based on the various config variables.
1180                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1181
1182                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1183                         # Honour customised robot policies for this namespace
1184                         $policy = array_merge(
1185                                 $policy,
1186                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1187                         );
1188                 }
1189                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1190                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1191                         # a final sanity check that we have really got the parser output.
1192                         $policy = array_merge(
1193                                 $policy,
1194                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1195                         );
1196                 }
1197
1198                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1199                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1200                         $policy = array_merge(
1201                                 $policy,
1202                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1203                         );
1204                 }
1205
1206                 return $policy;
1207         }
1208
1209         /**
1210          * Converts a String robot policy into an associative array, to allow
1211          * merging of several policies using array_merge().
1212          * @param $policy Mixed, returns empty array on null/false/'', transparent
1213          *            to already-converted arrays, converts String.
1214          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1215          */
1216         public static function formatRobotPolicy( $policy ) {
1217                 if ( is_array( $policy ) ) {
1218                         return $policy;
1219                 } elseif ( !$policy ) {
1220                         return array();
1221                 }
1222
1223                 $policy = explode( ',', $policy );
1224                 $policy = array_map( 'trim', $policy );
1225
1226                 $arr = array();
1227                 foreach ( $policy as $var ) {
1228                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1229                                 $arr['index'] = $var;
1230                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1231                                 $arr['follow'] = $var;
1232                         }
1233                 }
1234
1235                 return $arr;
1236         }
1237
1238         /**
1239          * If this request is a redirect view, send "redirected from" subtitle to
1240          * $wgOut. Returns true if the header was needed, false if this is not a
1241          * redirect view. Handles both local and remote redirects.
1242          *
1243          * @return boolean
1244          */
1245         public function showRedirectedFromHeader() {
1246                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1247
1248                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1249
1250                 if ( isset( $this->mRedirectedFrom ) ) {
1251                         // This is an internally redirected page view.
1252                         // We'll need a backlink to the source page for navigation.
1253                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1254                                 $redir = $wgUser->getSkin()->link(
1255                                         $this->mRedirectedFrom,
1256                                         null,
1257                                         array(),
1258                                         array( 'redirect' => 'no' ),
1259                                         array( 'known', 'noclasses' )
1260                                 );
1261
1262                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1263                                 $wgOut->setSubtitle( $s );
1264
1265                                 // Set the fragment if one was specified in the redirect
1266                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1267                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1268                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1269                                 }
1270
1271                                 // Add a <link rel="canonical"> tag
1272                                 $wgOut->addLink( array( 'rel' => 'canonical',
1273                                         'href' => $this->mTitle->getLocalURL() )
1274                                 );
1275
1276                                 return true;
1277                         }
1278                 } elseif ( $rdfrom ) {
1279                         // This is an externally redirected view, from some other wiki.
1280                         // If it was reported from a trusted site, supply a backlink.
1281                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1282                                 $redir = $wgUser->getSkin()->makeExternalLink( $rdfrom, $rdfrom );
1283                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1284                                 $wgOut->setSubtitle( $s );
1285
1286                                 return true;
1287                         }
1288                 }
1289
1290                 return false;
1291         }
1292
1293         /**
1294          * Show a header specific to the namespace currently being viewed, like
1295          * [[MediaWiki:Talkpagetext]]. For Article::view().
1296          */
1297         public function showNamespaceHeader() {
1298                 global $wgOut;
1299
1300                 if ( $this->mTitle->isTalkPage() ) {
1301                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1302                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1303                         }
1304                 }
1305         }
1306
1307         /**
1308          * Show the footer section of an ordinary page view
1309          */
1310         public function showViewFooter() {
1311                 global $wgOut, $wgUseTrackbacks;
1312
1313                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1314                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1315                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1316                 }
1317
1318                 # If we have been passed an &rcid= parameter, we want to give the user a
1319                 # chance to mark this new article as patrolled.
1320                 $this->showPatrolFooter();
1321
1322                 # Trackbacks
1323                 if ( $wgUseTrackbacks ) {
1324                         $this->addTrackbacks();
1325                 }
1326
1327                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
1328
1329         }
1330
1331         /**
1332          * If patrol is possible, output a patrol UI box. This is called from the
1333          * footer section of ordinary page views. If patrol is not possible or not
1334          * desired, does nothing.
1335          */
1336         public function showPatrolFooter() {
1337                 global $wgOut, $wgRequest, $wgUser;
1338
1339                 $rcid = $wgRequest->getVal( 'rcid' );
1340
1341                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1342                         return;
1343                 }
1344
1345                 $sk = $wgUser->getSkin();
1346                 $token = $wgUser->editToken( $rcid );
1347                 $wgOut->preventClickjacking();
1348
1349                 $wgOut->addHTML(
1350                         "<div class='patrollink'>" .
1351                                 wfMsgHtml(
1352                                         'markaspatrolledlink',
1353                                         $sk->link(
1354                                                 $this->mTitle,
1355                                                 wfMsgHtml( 'markaspatrolledtext' ),
1356                                                 array(),
1357                                                 array(
1358                                                         'action' => 'markpatrolled',
1359                                                         'rcid' => $rcid,
1360                                                         'token' => $token,
1361                                                 ),
1362                                                 array( 'known', 'noclasses' )
1363                                         )
1364                                 ) .
1365                         '</div>'
1366                 );
1367         }
1368
1369         /**
1370          * Show the error text for a missing article. For articles in the MediaWiki
1371          * namespace, show the default message text. To be called from Article::view().
1372          */
1373         public function showMissingArticle() {
1374                 global $wgOut, $wgRequest, $wgUser;
1375
1376                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1377                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1378                         $parts = explode( '/', $this->mTitle->getText() );
1379                         $rootPart = $parts[0];
1380                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1381                         $ip = User::isIP( $rootPart );
1382
1383                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1384                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1385                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1386                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1387                                 LogEventsList::showLogExtract(
1388                                         $wgOut,
1389                                         'block',
1390                                         $user->getUserPage()->getPrefixedText(),
1391                                         '',
1392                                         array(
1393                                                 'lim' => 1,
1394                                                 'showIfEmpty' => false,
1395                                                 'msgKey' => array(
1396                                                         'blocked-notice-logextract',
1397                                                         $user->getName() # Support GENDER in notice
1398                                                 )
1399                                         )
1400                                 );
1401                         }
1402                 }
1403
1404                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1405
1406                 # Show delete and move logs
1407                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1408                         array(  'lim' => 10,
1409                                 'conds' => array( "log_action != 'revision'" ),
1410                                 'showIfEmpty' => false,
1411                                 'msgKey' => array( 'moveddeleted-notice' ) )
1412                 );
1413
1414                 # Show error message
1415                 $oldid = $this->getOldID();
1416                 if ( $oldid ) {
1417                         $text = wfMsgNoTrans( 'missing-article',
1418                                 $this->mTitle->getPrefixedText(),
1419                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1420                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1421                         // Use the default message text
1422                         $text = $this->mTitle->getDefaultMessageText();
1423                 } else {
1424                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1425                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1426                         $errors = array_merge( $createErrors, $editErrors );
1427
1428                         if ( !count( $errors ) ) {
1429                                 $text = wfMsgNoTrans( 'noarticletext' );
1430                         } else {
1431                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1432                         }
1433                 }
1434                 $text = "<div class='noarticletext'>\n$text\n</div>";
1435
1436                 if ( !$this->hasViewableContent() ) {
1437                         // If there's no backing content, send a 404 Not Found
1438                         // for better machine handling of broken links.
1439                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
1440                 }
1441
1442                 $wgOut->addWikiText( $text );
1443         }
1444
1445         /**
1446          * If the revision requested for view is deleted, check permissions.
1447          * Send either an error message or a warning header to $wgOut.
1448          *
1449          * @return boolean true if the view is allowed, false if not.
1450          */
1451         public function showDeletedRevisionHeader() {
1452                 global $wgOut, $wgRequest;
1453
1454                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1455                         // Not deleted
1456                         return true;
1457                 }
1458
1459                 // If the user is not allowed to see it...
1460                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1461                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1462                                 'rev-deleted-text-permission' );
1463
1464                         return false;
1465                 // If the user needs to confirm that they want to see it...
1466                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1467                         # Give explanation and add a link to view the revision...
1468                         $oldid = intval( $this->getOldID() );
1469                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1470                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1471                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1472                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1473                                 array( $msg, $link ) );
1474
1475                         return false;
1476                 // We are allowed to see...
1477                 } else {
1478                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1479                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1480                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1481
1482                         return true;
1483                 }
1484         }
1485
1486         /**
1487          * Should the parser cache be used?
1488          *
1489          * @return boolean
1490          */
1491         public function useParserCache( $oldid ) {
1492                 global $wgUser, $wgEnableParserCache;
1493
1494                 return $wgEnableParserCache
1495                         && $wgUser->getStubThreshold() == 0
1496                         && $this->exists()
1497                         && empty( $oldid )
1498                         && !$this->mTitle->isCssOrJsPage()
1499                         && !$this->mTitle->isCssJsSubpage();
1500         }
1501
1502         /**
1503          * Execute the uncached parse for action=view
1504          */
1505         public function doViewParse() {
1506                 global $wgOut;
1507
1508                 $oldid = $this->getOldID();
1509                 $parserOptions = $this->getParserOptions();
1510
1511                 # Render printable version, use printable version cache
1512                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1513
1514                 # Don't show section-edit links on old revisions... this way lies madness.
1515                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->mTitle->quickUserCan( 'edit' ) ) {
1516                         $parserOptions->setEditSection( false );
1517                 }
1518
1519                 $useParserCache = $this->useParserCache( $oldid );
1520                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1521
1522                 return true;
1523         }
1524
1525         /**
1526          * Try to fetch an expired entry from the parser cache. If it is present,
1527          * output it and return true. If it is not present, output nothing and
1528          * return false. This is used as a callback function for
1529          * PoolCounter::executeProtected().
1530          *
1531          * @return boolean
1532          */
1533         public function tryDirtyCache() {
1534                 global $wgOut;
1535                 $parserCache = ParserCache::singleton();
1536                 $options = $this->getParserOptions();
1537
1538                 if ( $wgOut->isPrintable() ) {
1539                         $options->setIsPrintable( true );
1540                         $options->setEditSection( false );
1541                 }
1542
1543                 $output = $parserCache->getDirty( $this, $options );
1544
1545                 if ( $output ) {
1546                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1547                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1548                         $wgOut->setSquidMaxage( 0 );
1549                         $this->mParserOutput = $output;
1550                         $wgOut->addParserOutput( $output );
1551                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1552
1553                         return true;
1554                 } else {
1555                         wfDebugLog( 'dirty', "dirty missing\n" );
1556                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1557
1558                         return false;
1559                 }
1560         }
1561
1562         /**
1563          * View redirect
1564          *
1565          * @param $target Title|Array of destination(s) to redirect
1566          * @param $appendSubtitle Boolean [optional]
1567          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1568          * @return string containing HMTL with redirect link
1569          */
1570         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1571                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1572
1573                 if ( !is_array( $target ) ) {
1574                         $target = array( $target );
1575                 }
1576
1577                 $imageDir = $wgContLang->getDir();
1578
1579                 if ( $appendSubtitle ) {
1580                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1581                 }
1582
1583                 $sk = $wgUser->getSkin();
1584                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1585                 $title = array_shift( $target );
1586
1587                 if ( $forceKnown ) {
1588                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1589                 } else {
1590                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1591                 }
1592
1593                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1594                 $alt = $wgContLang->isRTL() ? '←' : '→';
1595                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1596                 foreach ( $target as $rt ) {
1597                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1598                         if ( $forceKnown ) {
1599                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1600                         } else {
1601                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1602                         }
1603                 }
1604
1605                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1606                 return '<div class="redirectMsg">' .
1607                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1608                         '<span class="redirectText">' . $link . '</span></div>';
1609         }
1610
1611         /**
1612          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1613          */
1614         public function addTrackbacks() {
1615                 global $wgOut;
1616
1617                 $dbr = wfGetDB( DB_SLAVE );
1618                 $tbs = $dbr->select( 'trackbacks',
1619                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1620                         array( 'tb_page' => $this->getID() )
1621                 );
1622
1623                 if ( !$dbr->numRows( $tbs ) ) {
1624                         return;
1625                 }
1626
1627                 $wgOut->preventClickjacking();
1628
1629                 $tbtext = "";
1630                 foreach ( $tbs as $o ) {
1631                         $rmvtxt = "";
1632
1633                         if ( $wgOut->getUser()->isAllowed( 'trackback' ) ) {
1634                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1635                                         $o->tb_id . "&token=" . urlencode( $wgOut->getUser()->editToken() ) );
1636                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1637                         }
1638
1639                         $tbtext .= "\n";
1640                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1641                                         $o->tb_title,
1642                                         $o->tb_url,
1643                                         $o->tb_ex,
1644                                         $o->tb_name,
1645                                         $rmvtxt );
1646                 }
1647
1648                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1649         }
1650
1651         /**
1652          * Removes trackback record for current article from trackbacks table
1653          */
1654         public function deletetrackback() {
1655                 global $wgRequest, $wgOut;
1656
1657                 if ( !$wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1658                         $wgOut->addWikiMsg( 'sessionfailure' );
1659
1660                         return;
1661                 }
1662
1663                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgOut->getUser() );
1664
1665                 if ( count( $permission_errors ) ) {
1666                         $wgOut->showPermissionsErrorPage( $permission_errors );
1667
1668                         return;
1669                 }
1670
1671                 $db = wfGetDB( DB_MASTER );
1672                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1673
1674                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1675                 $this->mTitle->invalidateCache();
1676         }
1677
1678         /**
1679          * Handle action=render
1680          */
1681
1682         public function render() {
1683                 global $wgOut;
1684
1685                 $wgOut->setArticleBodyOnly( true );
1686                 $this->view();
1687         }
1688
1689         /**
1690          * Handle action=purge
1691          */
1692         public function purge() {
1693                 global $wgRequest, $wgOut;
1694
1695                 if ( $wgOut->getUser()->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1696                         //FIXME: shouldn't this be in doPurge()?
1697                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1698                                 $this->doPurge();
1699                                 $this->view();
1700                         }
1701                 } else {
1702                         $formParams = array(
1703                                 'method' => 'post',
1704                                 'action' =>  $wgRequest->getRequestURL(),
1705                         );
1706
1707                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1708
1709                         $form  = Html::openElement( 'form', $formParams );
1710                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1711                         $form .= Html::closeElement( 'form' );
1712
1713                         $wgOut->addHTML( $form );
1714                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1715
1716                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1717                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1718                 }
1719         }
1720
1721         /**
1722          * Perform the actions of a page purging
1723          */
1724         public function doPurge() {
1725                 global $wgUseSquid;
1726
1727                 // Invalidate the cache
1728                 $this->mTitle->invalidateCache();
1729                 $this->clear();
1730
1731                 if ( $wgUseSquid ) {
1732                         // Commit the transaction before the purge is sent
1733                         $dbw = wfGetDB( DB_MASTER );
1734                         $dbw->commit();
1735
1736                         // Send purge
1737                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1738                         $update->doUpdate();
1739                 }
1740
1741                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1742                         if ( $this->getID() == 0 ) {
1743                                 $text = false;
1744                         } else {
1745                                 $text = $this->getRawText();
1746                         }
1747
1748                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1749                 }
1750         }
1751
1752         /**
1753          * Insert a new empty page record for this article.
1754          * This *must* be followed up by creating a revision
1755          * and running $this->updateRevisionOn( ... );
1756          * or else the record will be left in a funky state.
1757          * Best if all done inside a transaction.
1758          *
1759          * @param $dbw Database
1760          * @return int The newly created page_id key, or false if the title already existed
1761          * @private
1762          */
1763         public function insertOn( $dbw ) {
1764                 wfProfileIn( __METHOD__ );
1765
1766                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1767                 $dbw->insert( 'page', array(
1768                         'page_id'           => $page_id,
1769                         'page_namespace'    => $this->mTitle->getNamespace(),
1770                         'page_title'        => $this->mTitle->getDBkey(),
1771                         'page_counter'      => 0,
1772                         'page_restrictions' => '',
1773                         'page_is_redirect'  => 0, # Will set this shortly...
1774                         'page_is_new'       => 1,
1775                         'page_random'       => wfRandom(),
1776                         'page_touched'      => $dbw->timestamp(),
1777                         'page_latest'       => 0, # Fill this in shortly...
1778                         'page_len'          => 0, # Fill this in shortly...
1779                 ), __METHOD__, 'IGNORE' );
1780
1781                 $affected = $dbw->affectedRows();
1782
1783                 if ( $affected ) {
1784                         $newid = $dbw->insertId();
1785                         $this->mTitle->resetArticleID( $newid );
1786                 }
1787                 wfProfileOut( __METHOD__ );
1788
1789                 return $affected ? $newid : false;
1790         }
1791
1792         /**
1793          * Update the page record to point to a newly saved revision.
1794          *
1795          * @param $dbw DatabaseBase: object
1796          * @param $revision Revision: For ID number, and text used to set
1797                                                 length and redirect status fields
1798          * @param $lastRevision Integer: if given, will not overwrite the page field
1799          *                      when different from the currently set value.
1800          *                      Giving 0 indicates the new page flag should be set
1801          *                      on.
1802          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1803          *                           removing rows in redirect table.
1804          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1805          *                    Needed when $lastRevision has to be set to sth. !=0
1806          * @return bool true on success, false on failure
1807          * @private
1808          */
1809         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1810                 wfProfileIn( __METHOD__ );
1811
1812                 $text = $revision->getText();
1813                 $rt = Title::newFromRedirectRecurse( $text );
1814
1815                 $conditions = array( 'page_id' => $this->getId() );
1816
1817                 if ( !is_null( $lastRevision ) ) {
1818                         # An extra check against threads stepping on each other
1819                         $conditions['page_latest'] = $lastRevision;
1820                 }
1821
1822                 if ( !$setNewFlag ) {
1823                         $setNewFlag = ( $lastRevision === 0 );
1824                 }
1825
1826                 $dbw->update( 'page',
1827                         array( /* SET */
1828                                 'page_latest'      => $revision->getId(),
1829                                 'page_touched'     => $dbw->timestamp(),
1830                                 'page_is_new'      => $setNewFlag,
1831                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1832                                 'page_len'         => strlen( $text ),
1833                         ),
1834                         $conditions,
1835                         __METHOD__ );
1836
1837                 $result = $dbw->affectedRows() != 0;
1838                 if ( $result ) {
1839                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1840                 }
1841
1842                 wfProfileOut( __METHOD__ );
1843                 return $result;
1844         }
1845
1846         /**
1847          * Add row to the redirect table if this is a redirect, remove otherwise.
1848          *
1849          * @param $dbw Database
1850          * @param $redirectTitle Title object pointing to the redirect target,
1851          *                       or NULL if this is not a redirect
1852          * @param $lastRevIsRedirect If given, will optimize adding and
1853          *                           removing rows in redirect table.
1854          * @return bool true on success, false on failure
1855          * @private
1856          */
1857         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1858                 // Always update redirects (target link might have changed)
1859                 // Update/Insert if we don't know if the last revision was a redirect or not
1860                 // Delete if changing from redirect to non-redirect
1861                 $isRedirect = !is_null( $redirectTitle );
1862
1863                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
1864                         return true;
1865                 }
1866
1867                 wfProfileIn( __METHOD__ );
1868                 if ( $isRedirect ) {
1869                         $this->insertRedirectEntry( $redirectTitle );
1870                 } else {
1871                         // This is not a redirect, remove row from redirect table
1872                         $where = array( 'rd_from' => $this->getId() );
1873                         $dbw->delete( 'redirect', $where, __METHOD__ );
1874                 }
1875
1876                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1877                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1878                 }
1879                 wfProfileOut( __METHOD__ );
1880
1881                 return ( $dbw->affectedRows() != 0 );
1882         }
1883
1884         /**
1885          * If the given revision is newer than the currently set page_latest,
1886          * update the page record. Otherwise, do nothing.
1887          *
1888          * @param $dbw Database object
1889          * @param $revision Revision object
1890          * @return mixed
1891          */
1892         public function updateIfNewerOn( &$dbw, $revision ) {
1893                 wfProfileIn( __METHOD__ );
1894
1895                 $row = $dbw->selectRow(
1896                         array( 'revision', 'page' ),
1897                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1898                         array(
1899                                 'page_id' => $this->getId(),
1900                                 'page_latest=rev_id' ),
1901                         __METHOD__ );
1902
1903                 if ( $row ) {
1904                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1905                                 wfProfileOut( __METHOD__ );
1906                                 return false;
1907                         }
1908                         $prev = $row->rev_id;
1909                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1910                 } else {
1911                         # No or missing previous revision; mark the page as new
1912                         $prev = 0;
1913                         $lastRevIsRedirect = null;
1914                 }
1915
1916                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1917
1918                 wfProfileOut( __METHOD__ );
1919                 return $ret;
1920         }
1921
1922         /**
1923          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1924          * @param $text String: new text of the section
1925          * @param $summary String: new section's subject, only if $section is 'new'
1926          * @param $edittime String: revision timestamp or null to use the current revision
1927          * @return string Complete article text, or null if error
1928          */
1929         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1930                 wfProfileIn( __METHOD__ );
1931
1932                 if ( strval( $section ) == '' ) {
1933                         // Whole-page edit; let the whole text through
1934                 } else {
1935                         if ( is_null( $edittime ) ) {
1936                                 $rev = Revision::newFromTitle( $this->mTitle );
1937                         } else {
1938                                 $dbw = wfGetDB( DB_MASTER );
1939                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1940                         }
1941
1942                         if ( !$rev ) {
1943                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1944                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1945                                 wfProfileOut( __METHOD__ );
1946                                 return null;
1947                         }
1948
1949                         $oldtext = $rev->getText();
1950
1951                         if ( $section == 'new' ) {
1952                                 # Inserting a new section
1953                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1954                                 $text = strlen( trim( $oldtext ) ) > 0
1955                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1956                                                 : "{$subject}{$text}";
1957                         } else {
1958                                 # Replacing an existing section; roll out the big guns
1959                                 global $wgParser;
1960
1961                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1962                         }
1963                 }
1964
1965                 wfProfileOut( __METHOD__ );
1966                 return $text;
1967         }
1968
1969         /**
1970          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1971          * @param $flags Int
1972          * @return Int updated $flags
1973          */
1974         function checkFlags( $flags ) {
1975                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1976                         if ( $this->mTitle->getArticleID() ) {
1977                                 $flags |= EDIT_UPDATE;
1978                         } else {
1979                                 $flags |= EDIT_NEW;
1980                         }
1981                 }
1982
1983                 return $flags;
1984         }
1985
1986         /**
1987          * Article::doEdit()
1988          *
1989          * Change an existing article or create a new article. Updates RC and all necessary caches,
1990          * optionally via the deferred update array.
1991          *
1992          * $wgUser must be set before calling this function.
1993          *
1994          * @param $text String: new text
1995          * @param $summary String: edit summary
1996          * @param $flags Integer bitfield:
1997          *      EDIT_NEW
1998          *          Article is known or assumed to be non-existent, create a new one
1999          *      EDIT_UPDATE
2000          *          Article is known or assumed to be pre-existing, update it
2001          *      EDIT_MINOR
2002          *          Mark this edit minor, if the user is allowed to do so
2003          *      EDIT_SUPPRESS_RC
2004          *          Do not log the change in recentchanges
2005          *      EDIT_FORCE_BOT
2006          *          Mark the edit a "bot" edit regardless of user rights
2007          *      EDIT_DEFER_UPDATES
2008          *          Defer some of the updates until the end of index.php
2009          *      EDIT_AUTOSUMMARY
2010          *          Fill in blank summaries with generated text where possible
2011          *
2012          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2013          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2014          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2015          * edit-already-exists error will be returned. These two conditions are also possible with
2016          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2017          *
2018          * @param $baseRevId the revision ID this edit was based off, if any
2019          * @param $user User (optional), $wgUser will be used if not passed
2020          *
2021          * @return Status object. Possible errors:
2022          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2023          *     edit-gone-missing:       In update mode, but the article didn't exist
2024          *     edit-conflict:           In update mode, the article changed unexpectedly
2025          *     edit-no-change:          Warning that the text was the same as before
2026          *     edit-already-exists:     In creation mode, but the article already exists
2027          *
2028          *  Extensions may define additional errors.
2029          *
2030          *  $return->value will contain an associative array with members as follows:
2031          *     new:                     Boolean indicating if the function attempted to create a new article
2032          *     revision:                The revision object for the inserted revision, or null
2033          *
2034          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2035          */
2036         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2037                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2038
2039                 # Low-level sanity check
2040                 if ( $this->mTitle->getText() === '' ) {
2041                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2042                 }
2043
2044                 wfProfileIn( __METHOD__ );
2045
2046                 $user = is_null( $user ) ? $wgUser : $user;
2047                 $status = Status::newGood( array() );
2048
2049                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2050                 $this->loadPageData();
2051
2052                 $flags = $this->checkFlags( $flags );
2053
2054                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2055                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2056                 {
2057                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2058
2059                         if ( $status->isOK() ) {
2060                                 $status->fatal( 'edit-hook-aborted' );
2061                         }
2062
2063                         wfProfileOut( __METHOD__ );
2064                         return $status;
2065                 }
2066
2067                 # Silently ignore EDIT_MINOR if not allowed
2068                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2069                 $bot = $flags & EDIT_FORCE_BOT;
2070
2071                 $oldtext = $this->getRawText(); // current revision
2072                 $oldsize = strlen( $oldtext );
2073
2074                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2075                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2076                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2077                 }
2078
2079                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
2080                 $text = $editInfo->pst;
2081                 $newsize = strlen( $text );
2082
2083                 $dbw = wfGetDB( DB_MASTER );
2084                 $now = wfTimestampNow();
2085                 $this->mTimestamp = $now;
2086
2087                 if ( $flags & EDIT_UPDATE ) {
2088                         # Update article, but only if changed.
2089                         $status->value['new'] = false;
2090
2091                         # Make sure the revision is either completely inserted or not inserted at all
2092                         if ( !$wgDBtransactions ) {
2093                                 $userAbort = ignore_user_abort( true );
2094                         }
2095
2096                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2097
2098                         if ( $changed ) {
2099                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2100                                   - (int)$this->isCountable( $oldtext );
2101                                 $this->mTotalAdjustment = 0;
2102
2103                                 if ( !$this->mLatest ) {
2104                                         # Article gone missing
2105                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2106                                         $status->fatal( 'edit-gone-missing' );
2107
2108                                         wfProfileOut( __METHOD__ );
2109                                         return $status;
2110                                 }
2111
2112                                 $revision = new Revision( array(
2113                                         'page'       => $this->getId(),
2114                                         'comment'    => $summary,
2115                                         'minor_edit' => $isminor,
2116                                         'text'       => $text,
2117                                         'parent_id'  => $this->mLatest,
2118                                         'user'       => $user->getId(),
2119                                         'user_text'  => $user->getName(),
2120                                         'timestamp'  => $now
2121                                 ) );
2122
2123                                 $dbw->begin();
2124                                 $revisionId = $revision->insertOn( $dbw );
2125
2126                                 # Update page
2127                                 #
2128                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2129                                 # during the course of this function. This makes sure that EditPage can detect
2130                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2131                                 # before this function is called. A previous function used a separate query, this
2132                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2133                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2134
2135                                 if ( !$ok ) {
2136                                         /* Belated edit conflict! Run away!! */
2137                                         $status->fatal( 'edit-conflict' );
2138
2139                                         # Delete the invalid revision if the DB is not transactional
2140                                         if ( !$wgDBtransactions ) {
2141                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2142                                         }
2143
2144                                         $revisionId = 0;
2145                                         $dbw->rollback();
2146                                 } else {
2147                                         global $wgUseRCPatrol;
2148                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2149                                         # Update recentchanges
2150                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2151                                                 # Mark as patrolled if the user can do so
2152                                                 $patrolled = $wgUseRCPatrol && !count(
2153                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2154                                                 # Add RC row to the DB
2155                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2156                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2157                                                         $revisionId, $patrolled
2158                                                 );
2159
2160                                                 # Log auto-patrolled edits
2161                                                 if ( $patrolled ) {
2162                                                         PatrolLog::record( $rc, true );
2163                                                 }
2164                                         }
2165                                         $user->incEditCount();
2166                                         $dbw->commit();
2167                                 }
2168                         } else {
2169                                 $status->warning( 'edit-no-change' );
2170                                 $revision = null;
2171                                 // Keep the same revision ID, but do some updates on it
2172                                 $revisionId = $this->getLatest();
2173                                 // Update page_touched, this is usually implicit in the page update
2174                                 // Other cache updates are done in onArticleEdit()
2175                                 $this->mTitle->invalidateCache();
2176                         }
2177
2178                         if ( !$wgDBtransactions ) {
2179                                 ignore_user_abort( $userAbort );
2180                         }
2181
2182                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2183                         if ( !$status->isOK() ) {
2184                                 wfProfileOut( __METHOD__ );
2185                                 return $status;
2186                         }
2187
2188                         # Invalidate cache of this article and all pages using this article
2189                         # as a template. Partly deferred.
2190                         Article::onArticleEdit( $this->mTitle );
2191                         # Update links tables, site stats, etc.
2192                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed, $user );
2193                 } else {
2194                         # Create new article
2195                         $status->value['new'] = true;
2196
2197                         # Set statistics members
2198                         # We work out if it's countable after PST to avoid counter drift
2199                         # when articles are created with {{subst:}}
2200                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2201                         $this->mTotalAdjustment = 1;
2202
2203                         $dbw->begin();
2204
2205                         # Add the page record; stake our claim on this title!
2206                         # This will return false if the article already exists
2207                         $newid = $this->insertOn( $dbw );
2208
2209                         if ( $newid === false ) {
2210                                 $dbw->rollback();
2211                                 $status->fatal( 'edit-already-exists' );
2212
2213                                 wfProfileOut( __METHOD__ );
2214                                 return $status;
2215                         }
2216
2217                         # Save the revision text...
2218                         $revision = new Revision( array(
2219                                 'page'       => $newid,
2220                                 'comment'    => $summary,
2221                                 'minor_edit' => $isminor,
2222                                 'text'       => $text,
2223                                 'user'       => $user->getId(),
2224                                 'user_text'  => $user->getName(),
2225                                 'timestamp'  => $now
2226                         ) );
2227                         $revisionId = $revision->insertOn( $dbw );
2228
2229                         $this->mTitle->resetArticleID( $newid );
2230                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached (FIXME?)
2231                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
2232
2233                         # Update the page record with revision data
2234                         $this->updateRevisionOn( $dbw, $revision, 0 );
2235
2236                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2237
2238                         # Update recentchanges
2239                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2240                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2241
2242                                 # Mark as patrolled if the user can do so
2243                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
2244                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2245                                 # Add RC row to the DB
2246                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2247                                         '', strlen( $text ), $revisionId, $patrolled );
2248
2249                                 # Log auto-patrolled edits
2250                                 if ( $patrolled ) {
2251                                         PatrolLog::record( $rc, true );
2252                                 }
2253                         }
2254                         $user->incEditCount();
2255                         $dbw->commit();
2256
2257                         # Update links, etc.
2258                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true, $user );
2259
2260                         # Clear caches
2261                         Article::onArticleCreate( $this->mTitle );
2262
2263                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2264                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2265                 }
2266
2267                 # Do updates right now unless deferral was requested
2268                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2269                         wfDoUpdates();
2270                 }
2271
2272                 // Return the new revision (or null) to the caller
2273                 $status->value['revision'] = $revision;
2274
2275                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2276                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2277
2278                 wfProfileOut( __METHOD__ );
2279                 return $status;
2280         }
2281
2282         /**
2283          * Output a redirect back to the article.
2284          * This is typically used after an edit.
2285          *
2286          * @param $noRedir Boolean: add redirect=no
2287          * @param $sectionAnchor String: section to redirect to, including "#"
2288          * @param $extraQuery String: extra query params
2289          */
2290         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2291                 global $wgOut;
2292
2293                 if ( $noRedir ) {
2294                         $query = 'redirect=no';
2295                         if ( $extraQuery )
2296                                 $query .= "&$extraQuery";
2297                 } else {
2298                         $query = $extraQuery;
2299                 }
2300
2301                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2302         }
2303
2304         /**
2305          * Mark this particular edit/page as patrolled
2306          */
2307         public function markpatrolled() {
2308                 global $wgOut, $wgRequest;
2309
2310                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2311
2312                 # If we haven't been given an rc_id value, we can't do anything
2313                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2314
2315                 if ( !$wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'token' ), $rcid ) ) {
2316                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2317                         return;
2318                 }
2319
2320                 $rc = RecentChange::newFromId( $rcid );
2321
2322                 if ( is_null( $rc ) ) {
2323                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2324                         return;
2325                 }
2326
2327                 # It would be nice to see where the user had actually come from, but for now just guess
2328                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2329                 $return = SpecialPage::getTitleFor( $returnto );
2330
2331                 $errors = $rc->doMarkPatrolled();
2332
2333                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2334                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2335
2336                         return;
2337                 }
2338
2339                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2340                         // The hook itself has handled any output
2341                         return;
2342                 }
2343
2344                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2345                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2346                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2347                         $wgOut->returnToMain( false, $return );
2348
2349                         return;
2350                 }
2351
2352                 if ( !empty( $errors ) ) {
2353                         $wgOut->showPermissionsErrorPage( $errors );
2354
2355                         return;
2356                 }
2357
2358                 # Inform the user
2359                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2360                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2361                 $wgOut->returnToMain( false, $return );
2362         }
2363
2364         /**
2365          * User-interface handler for the "watch" action
2366          */
2367         public function watch() {
2368                 global $wgOut;
2369
2370                 if ( $wgOut->getUser()->isAnon() ) {
2371                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2372                         return;
2373                 }
2374
2375                 if ( wfReadOnly() ) {
2376                         $wgOut->readOnlyPage();
2377                         return;
2378                 }
2379
2380                 if ( $this->doWatch() ) {
2381                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2382                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2383                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2384                 }
2385
2386                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2387         }
2388
2389         /**
2390          * Add this page to $wgUser's watchlist
2391          *
2392          * This is safe to be called multiple times
2393          *
2394          * @return bool true on successful watch operation
2395          */
2396         public function doWatch() {
2397                 global $wgUser;
2398
2399                 if ( $wgUser->isAnon() ) {
2400                         return false;
2401                 }
2402
2403                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2404                         $wgUser->addWatch( $this->mTitle );
2405                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2406                 }
2407
2408                 return false;
2409         }
2410
2411         /**
2412          * User interface handler for the "unwatch" action.
2413          */
2414         public function unwatch() {
2415                 global $wgOut;
2416
2417                 if ( $wgOut->getUser()->isAnon() ) {
2418                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2419                         return;
2420                 }
2421
2422                 if ( wfReadOnly() ) {
2423                         $wgOut->readOnlyPage();
2424                         return;
2425                 }
2426
2427                 if ( $this->doUnwatch() ) {
2428                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2429                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2430                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2431                 }
2432
2433                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2434         }
2435
2436         /**
2437          * Stop watching a page
2438          * @return bool true on successful unwatch
2439          */
2440         public function doUnwatch() {
2441                 global $wgUser;
2442
2443                 if ( $wgUser->isAnon() ) {
2444                         return false;
2445                 }
2446
2447                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2448                         $wgUser->removeWatch( $this->mTitle );
2449                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2450                 }
2451
2452                 return false;
2453         }
2454
2455         /**
2456          * action=protect handler
2457          */
2458         public function protect() {
2459                 $form = new ProtectionForm( $this );
2460                 $form->execute();
2461         }
2462
2463         /**
2464          * action=unprotect handler (alias)
2465          */
2466         public function unprotect() {
2467                 $this->protect();
2468         }
2469
2470         /**
2471          * Update the article's restriction field, and leave a log entry.
2472          *
2473          * @param $limit Array: set of restriction keys
2474          * @param $reason String
2475          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2476          * @param $expiry Array: per restriction type expiration
2477          * @return bool true on success
2478          */
2479         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2480                 global $wgUser, $wgContLang;
2481
2482                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2483
2484                 $id = $this->mTitle->getArticleID();
2485
2486                 if ( $id <= 0 ) {
2487                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
2488                         return false;
2489                 }
2490
2491                 if ( wfReadOnly() ) {
2492                         wfDebug( "updateRestrictions failed: read-only\n" );
2493                         return false;
2494                 }
2495
2496                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2497                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2498                         return false;
2499                 }
2500
2501                 if ( !$cascade ) {
2502                         $cascade = false;
2503                 }
2504
2505                 // Take this opportunity to purge out expired restrictions
2506                 Title::purgeExpiredRestrictions();
2507
2508                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2509                 # we expect a single selection, but the schema allows otherwise.
2510                 $current = array();
2511                 $updated = Article::flattenRestrictions( $limit );
2512                 $changed = false;
2513
2514                 foreach ( $restrictionTypes as $action ) {
2515                         if ( isset( $expiry[$action] ) ) {
2516                                 # Get current restrictions on $action
2517                                 $aLimits = $this->mTitle->getRestrictions( $action );
2518                                 $current[$action] = implode( '', $aLimits );
2519                                 # Are any actual restrictions being dealt with here?
2520                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2521
2522                                 # If something changed, we need to log it. Checking $aRChanged
2523                                 # assures that "unprotecting" a page that is not protected does
2524                                 # not log just because the expiry was "changed".
2525                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2526                                         $changed = true;
2527                                 }
2528                         }
2529                 }
2530
2531                 $current = Article::flattenRestrictions( $current );
2532
2533                 $changed = ( $changed || $current != $updated );
2534                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2535                 $protect = ( $updated != '' );
2536
2537                 # If nothing's changed, do nothing
2538                 if ( $changed ) {
2539                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2540                                 $dbw = wfGetDB( DB_MASTER );
2541
2542                                 # Prepare a null revision to be added to the history
2543                                 $modified = $current != '' && $protect;
2544
2545                                 if ( $protect ) {
2546                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2547                                 } else {
2548                                         $comment_type = 'unprotectedarticle';
2549                                 }
2550
2551                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2552
2553                                 # Only restrictions with the 'protect' right can cascade...
2554                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2555                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2556
2557                                 # The schema allows multiple restrictions
2558                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2559                                         $cascade = false;
2560                                 }
2561
2562                                 $cascade_description = '';
2563
2564                                 if ( $cascade ) {
2565                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2566                                 }
2567
2568                                 if ( $reason ) {
2569                                         $comment .= ": $reason";
2570                                 }
2571
2572                                 $editComment = $comment;
2573                                 $encodedExpiry = array();
2574                                 $protect_description = '';
2575                                 foreach ( $limit as $action => $restrictions ) {
2576                                         if ( !isset( $expiry[$action] ) )
2577                                                 $expiry[$action] = $dbw->getInfinity();
2578
2579                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2580                                         if ( $restrictions != '' ) {
2581                                                 $protect_description .= "[$action=$restrictions] (";
2582                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2583                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2584                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2585                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2586                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2587                                                 } else {
2588                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2589                                                 }
2590
2591                                                 $protect_description .= ') ';
2592                                         }
2593                                 }
2594                                 $protect_description = trim( $protect_description );
2595
2596                                 if ( $protect_description && $protect ) {
2597                                         $editComment .= " ($protect_description)";
2598                                 }
2599
2600                                 if ( $cascade ) {
2601                                         $editComment .= "$cascade_description";
2602                                 }
2603
2604                                 # Update restrictions table
2605                                 foreach ( $limit as $action => $restrictions ) {
2606                                         if ( $restrictions != '' ) {
2607                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2608                                                         array( 'pr_page' => $id,
2609                                                                 'pr_type' => $action,
2610                                                                 'pr_level' => $restrictions,
2611                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2612                                                                 'pr_expiry' => $encodedExpiry[$action]
2613                                                         ),
2614                                                         __METHOD__
2615                                                 );
2616                                         } else {
2617                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2618                                                         'pr_type' => $action ), __METHOD__ );
2619                                         }
2620                                 }
2621
2622                                 # Insert a null revision
2623                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2624                                 $nullRevId = $nullRevision->insertOn( $dbw );
2625
2626                                 $latest = $this->getLatest();
2627                                 # Update page record
2628                                 $dbw->update( 'page',
2629                                         array( /* SET */
2630                                                 'page_touched' => $dbw->timestamp(),
2631                                                 'page_restrictions' => '',
2632                                                 'page_latest' => $nullRevId
2633                                         ), array( /* WHERE */
2634                                                 'page_id' => $id
2635                                         ), 'Article::protect'
2636                                 );
2637
2638                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2639                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2640
2641                                 # Update the protection log
2642                                 $log = new LogPage( 'protect' );
2643                                 if ( $protect ) {
2644                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2645                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2646                                 } else {
2647                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2648                                 }
2649                         } # End hook
2650                 } # End "changed" check
2651
2652                 return true;
2653         }
2654
2655         /**
2656          * Take an array of page restrictions and flatten it to a string
2657          * suitable for insertion into the page_restrictions field.
2658          * @param $limit Array
2659          * @return String
2660          */
2661         protected static function flattenRestrictions( $limit ) {
2662                 if ( !is_array( $limit ) ) {
2663                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2664                 }
2665
2666                 $bits = array();
2667                 ksort( $limit );
2668
2669                 foreach ( $limit as $action => $restrictions ) {
2670                         if ( $restrictions != '' ) {
2671                                 $bits[] = "$action=$restrictions";
2672                         }
2673                 }
2674
2675                 return implode( ':', $bits );
2676         }
2677
2678         /**
2679          * Auto-generates a deletion reason
2680          *
2681          * @param &$hasHistory Boolean: whether the page has a history
2682          * @return mixed String containing deletion reason or empty string, or boolean false
2683          *    if no revision occurred
2684          */
2685         public function generateReason( &$hasHistory ) {
2686                 global $wgContLang;
2687
2688                 $dbw = wfGetDB( DB_MASTER );
2689                 // Get the last revision
2690                 $rev = Revision::newFromTitle( $this->mTitle );
2691
2692                 if ( is_null( $rev ) ) {
2693                         return false;
2694                 }
2695
2696                 // Get the article's contents
2697                 $contents = $rev->getText();
2698                 $blank = false;
2699
2700                 // If the page is blank, use the text from the previous revision,
2701                 // which can only be blank if there's a move/import/protect dummy revision involved
2702                 if ( $contents == '' ) {
2703                         $prev = $rev->getPrevious();
2704
2705                         if ( $prev )    {
2706                                 $contents = $prev->getText();
2707                                 $blank = true;
2708                         }
2709                 }
2710
2711                 // Find out if there was only one contributor
2712                 // Only scan the last 20 revisions
2713                 $res = $dbw->select( 'revision', 'rev_user_text',
2714                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2715                         __METHOD__,
2716                         array( 'LIMIT' => 20 )
2717                 );
2718
2719                 if ( $res === false ) {
2720                         // This page has no revisions, which is very weird
2721                         return false;
2722                 }
2723
2724                 $hasHistory = ( $res->numRows() > 1 );
2725                 $row = $dbw->fetchObject( $res );
2726
2727                 if ( $row ) { // $row is false if the only contributor is hidden
2728                         $onlyAuthor = $row->rev_user_text;
2729                         // Try to find a second contributor
2730                         foreach ( $res as $row ) {
2731                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2732                                         $onlyAuthor = false;
2733                                         break;
2734                                 }
2735                         }
2736                 } else {
2737                         $onlyAuthor = false;
2738                 }
2739
2740                 // Generate the summary with a '$1' placeholder
2741                 if ( $blank ) {
2742                         // The current revision is blank and the one before is also
2743                         // blank. It's just not our lucky day
2744                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2745                 } else {
2746                         if ( $onlyAuthor ) {
2747                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2748                         } else {
2749                                 $reason = wfMsgForContent( 'excontent', '$1' );
2750                         }
2751                 }
2752
2753                 if ( $reason == '-' ) {
2754                         // Allow these UI messages to be blanked out cleanly
2755                         return '';
2756                 }
2757
2758                 // Replace newlines with spaces to prevent uglyness
2759                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2760                 // Calculate the maximum amount of chars to get
2761                 // Max content length = max comment length - length of the comment (excl. $1)
2762                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2763                 $contents = $wgContLang->truncate( $contents, $maxLength );
2764                 // Remove possible unfinished links
2765                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2766                 // Now replace the '$1' placeholder
2767                 $reason = str_replace( '$1', $contents, $reason );
2768
2769                 return $reason;
2770         }
2771
2772
2773         /*
2774          * UI entry point for page deletion
2775          */
2776         public function delete() {
2777                 global $wgOut, $wgRequest;
2778
2779                 $confirm = $wgRequest->wasPosted() &&
2780                                 $wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2781
2782                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2783                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2784
2785                 $reason = $this->DeleteReasonList;
2786
2787                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2788                         // Entry from drop down menu + additional comment
2789                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2790                 } elseif ( $reason == 'other' ) {
2791                         $reason = $this->DeleteReason;
2792                 }
2793
2794                 # Flag to hide all contents of the archived revisions
2795                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgOut->getUser()->isAllowed( 'suppressrevision' );
2796
2797                 # This code desperately needs to be totally rewritten
2798
2799                 # Read-only check...
2800                 if ( wfReadOnly() ) {
2801                         $wgOut->readOnlyPage();
2802
2803                         return;
2804                 }
2805
2806                 # Check permissions
2807                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgOut->getUser() );
2808
2809                 if ( count( $permission_errors ) > 0 ) {
2810                         $wgOut->showPermissionsErrorPage( $permission_errors );
2811
2812                         return;
2813                 }
2814
2815                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2816
2817                 # Better double-check that it hasn't been deleted yet!
2818                 $dbw = wfGetDB( DB_MASTER );
2819                 $conds = $this->mTitle->pageCond();
2820                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2821                 if ( $latest === false ) {
2822                         $wgOut->showFatalError(
2823                                 Html::rawElement(
2824                                         'div',
2825                                         array( 'class' => 'error mw-error-cannotdelete' ),
2826                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2827                                 )
2828                         );
2829                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2830                         LogEventsList::showLogExtract(
2831                                 $wgOut,
2832                                 'delete',
2833                                 $this->mTitle->getPrefixedText()
2834                         );
2835
2836                         return;
2837                 }
2838
2839                 # Hack for big sites
2840                 $bigHistory = $this->isBigDeletion();
2841                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2842                         global $wgLang, $wgDeleteRevisionsLimit;
2843
2844                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2845                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2846
2847                         return;
2848                 }
2849
2850                 if ( $confirm ) {
2851                         $this->doDelete( $reason, $suppress );
2852
2853                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgOut->getUser()->isLoggedIn() ) {
2854                                 $this->doWatch();
2855                         } elseif ( $this->mTitle->userIsWatching() ) {
2856                                 $this->doUnwatch();
2857                         }
2858
2859                         return;
2860                 }
2861
2862                 // Generate deletion reason
2863                 $hasHistory = false;
2864                 if ( !$reason ) {
2865                         $reason = $this->generateReason( $hasHistory );
2866                 }
2867
2868                 // If the page has a history, insert a warning
2869                 if ( $hasHistory && !$confirm ) {
2870                         global $wgLang;
2871
2872                         $skin = $wgOut->getSkin();
2873                         $revisions = $this->estimateRevisionCount();
2874                         //FIXME: lego
2875                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2876                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2877                                 wfMsgHtml( 'word-separator' ) . $skin->link( $this->mTitle,
2878                                         wfMsgHtml( 'history' ),
2879                                         array( 'rel' => 'archives' ),
2880                                         array( 'action' => 'history' ) ) .
2881                                 '</strong>'
2882                         );
2883
2884                         if ( $bigHistory ) {
2885                                 global $wgDeleteRevisionsLimit;
2886                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2887                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2888                         }
2889                 }
2890
2891                 return $this->confirmDelete( $reason );
2892         }
2893
2894         /**
2895          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2896          */
2897         public function isBigDeletion() {
2898                 global $wgDeleteRevisionsLimit;
2899
2900                 if ( $wgDeleteRevisionsLimit ) {
2901                         $revCount = $this->estimateRevisionCount();
2902
2903                         return $revCount > $wgDeleteRevisionsLimit;
2904                 }
2905
2906                 return false;
2907         }
2908
2909         /**
2910          * @return int approximate revision count
2911          */
2912         public function estimateRevisionCount() {
2913                 $dbr = wfGetDB( DB_SLAVE );
2914
2915                 // For an exact count...
2916                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2917                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2918                 return $dbr->estimateRowCount( 'revision', '*',
2919                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2920         }
2921
2922         /**
2923          * Get the last N authors
2924          * @param $num Integer: number of revisions to get
2925          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2926          * @return array Array of authors, duplicates not removed
2927          */
2928         public function getLastNAuthors( $num, $revLatest = 0 ) {
2929                 wfProfileIn( __METHOD__ );
2930                 // First try the slave
2931                 // If that doesn't have the latest revision, try the master
2932                 $continue = 2;
2933                 $db = wfGetDB( DB_SLAVE );
2934
2935                 do {
2936                         $res = $db->select( array( 'page', 'revision' ),
2937                                 array( 'rev_id', 'rev_user_text' ),
2938                                 array(
2939                                         'page_namespace' => $this->mTitle->getNamespace(),
2940                                         'page_title' => $this->mTitle->getDBkey(),
2941                                         'rev_page = page_id'
2942                                 ), __METHOD__, $this->getSelectOptions( array(
2943                                         'ORDER BY' => 'rev_timestamp DESC',
2944                                         'LIMIT' => $num
2945                                 ) )
2946                         );
2947
2948                         if ( !$res ) {
2949                                 wfProfileOut( __METHOD__ );
2950                                 return array();
2951                         }
2952
2953                         $row = $db->fetchObject( $res );
2954
2955                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2956                                 $db = wfGetDB( DB_MASTER );
2957                                 $continue--;
2958                         } else {
2959                                 $continue = 0;
2960                         }
2961                 } while ( $continue );
2962
2963                 $authors = array( $row->rev_user_text );
2964
2965                 foreach ( $res as $row ) {
2966                         $authors[] = $row->rev_user_text;
2967                 }
2968
2969                 wfProfileOut( __METHOD__ );
2970                 return $authors;
2971         }
2972
2973         /**
2974          * Output deletion confirmation dialog
2975          * FIXME: Move to another file?
2976          * @param $reason String: prefilled reason
2977          */
2978         public function confirmDelete( $reason ) {
2979                 global $wgOut;
2980
2981                 wfDebug( "Article::confirmDelete\n" );
2982
2983                 $deleteBackLink = $wgOut->getSkin()->linkKnown( $this->mTitle );
2984                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2985                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2986                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2987
2988                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2989
2990                 if ( $wgOut->getUser()->isAllowed( 'suppressrevision' ) ) {
2991                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
2992                                         <td></td>
2993                                         <td class='mw-input'><strong>" .
2994                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2995                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2996                                         "</strong></td>
2997                                 </tr>";
2998                 } else {
2999                         $suppress = '';
3000                 }
3001                 $checkWatch = $wgOut->getUser()->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3002
3003                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3004                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3005                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3006                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3007                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3008                         "<tr id=\"wpDeleteReasonListRow\">
3009                                 <td class='mw-label'>" .
3010                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3011                                 "</td>
3012                                 <td class='mw-input'>" .
3013                                         Xml::listDropDown( 'wpDeleteReasonList',
3014                                                 wfMsgForContent( 'deletereason-dropdown' ),
3015                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3016                                 "</td>
3017                         </tr>
3018                         <tr id=\"wpDeleteReasonRow\">
3019                                 <td class='mw-label'>" .
3020                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3021                                 "</td>
3022                                 <td class='mw-input'>" .
3023                                 Html::input( 'wpReason', $reason, 'text', array(
3024                                         'size' => '60',
3025                                         'maxlength' => '255',
3026                                         'tabindex' => '2',
3027                                         'id' => 'wpReason',
3028                                         'autofocus'
3029                                 ) ) .
3030                                 "</td>
3031                         </tr>";
3032
3033                 # Disallow watching if user is not logged in
3034                 if ( $wgOut->getUser()->isLoggedIn() ) {
3035                         $form .= "
3036                         <tr>
3037                                 <td></td>
3038                                 <td class='mw-input'>" .
3039                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3040                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3041                                 "</td>
3042                         </tr>";
3043                 }
3044
3045                 $form .= "
3046                         $suppress
3047                         <tr>
3048                                 <td></td>
3049                                 <td class='mw-submit'>" .
3050                                         Xml::submitButton( wfMsg( 'deletepage' ),
3051                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3052                                 "</td>
3053                         </tr>" .
3054                         Xml::closeElement( 'table' ) .
3055                         Xml::closeElement( 'fieldset' ) .
3056                         Html::hidden( 'wpEditToken', $wgOut->getUser()->editToken() ) .
3057                         Xml::closeElement( 'form' );
3058
3059                         if ( $wgOut->getUser()->isAllowed( 'editinterface' ) ) {
3060                                 $skin = $wgOut->getSkin();
3061                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3062                                 $link = $skin->link(
3063                                         $title,
3064                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3065                                         array(),
3066                                         array( 'action' => 'edit' )
3067                                 );
3068                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3069                         }
3070
3071                 $wgOut->addHTML( $form );
3072                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3073                 LogEventsList::showLogExtract( $wgOut, 'delete',
3074                         $this->mTitle->getPrefixedText()
3075                 );
3076         }
3077
3078         /**
3079          * Perform a deletion and output success or failure messages
3080          */
3081         public function doDelete( $reason, $suppress = false ) {
3082                 global $wgOut;
3083
3084                 $id = $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3085
3086                 $error = '';
3087                 if ( $this->doDeleteArticle( $reason, $suppress, $id, $error ) ) {
3088                         $deleted = $this->mTitle->getPrefixedText();
3089
3090                         $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3091                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
3092
3093                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3094
3095                         $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3096                         $wgOut->returnToMain( false );
3097                 } else {
3098                         if ( $error == '' ) {
3099                                 $wgOut->showFatalError(
3100                                         Html::rawElement(
3101                                                 'div',
3102                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3103                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3104                                         )
3105                                 );
3106
3107                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3108
3109                                 LogEventsList::showLogExtract(
3110                                         $wgOut,
3111                                         'delete',
3112                                         $this->mTitle->getPrefixedText()
3113                                 );
3114                         } else {
3115                                 $wgOut->showFatalError( $error );
3116                         }
3117                 }
3118         }
3119
3120         /**
3121          * Back-end article deletion
3122          * Deletes the article with database consistency, writes logs, purges caches
3123          *
3124          * @param $reason string delete reason for deletion log
3125          * @param suppress bitfield
3126          *      Revision::DELETED_TEXT
3127          *      Revision::DELETED_COMMENT
3128          *      Revision::DELETED_USER
3129          *      Revision::DELETED_RESTRICTED
3130          * @param $id int article ID
3131          * @param $commit boolean defaults to true, triggers transaction end
3132          * @return boolean true if successful
3133          */
3134         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
3135                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3136                 global $wgUser;
3137
3138                 wfDebug( __METHOD__ . "\n" );
3139
3140                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3141                         return false;
3142                 }
3143                 $dbw = wfGetDB( DB_MASTER );
3144                 $t = $this->mTitle->getDBkey();
3145                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3146
3147                 if ( $t === '' || $id == 0 ) {
3148                         return false;
3149                 }
3150
3151                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3152                 array_push( $wgDeferredUpdateList, $u );
3153
3154                 // Bitfields to further suppress the content
3155                 if ( $suppress ) {
3156                         $bitfield = 0;
3157                         // This should be 15...
3158                         $bitfield |= Revision::DELETED_TEXT;
3159                         $bitfield |= Revision::DELETED_COMMENT;
3160                         $bitfield |= Revision::DELETED_USER;
3161                         $bitfield |= Revision::DELETED_RESTRICTED;
3162                 } else {
3163                         $bitfield = 'rev_deleted';
3164                 }
3165
3166                 $dbw->begin();
3167                 // For now, shunt the revision data into the archive table.
3168                 // Text is *not* removed from the text table; bulk storage
3169                 // is left intact to avoid breaking block-compression or
3170                 // immutable storage schemes.
3171                 //
3172                 // For backwards compatibility, note that some older archive
3173                 // table entries will have ar_text and ar_flags fields still.
3174                 //
3175                 // In the future, we may keep revisions and mark them with
3176                 // the rev_deleted field, which is reserved for this purpose.
3177                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3178                         array(
3179                                 'ar_namespace'  => 'page_namespace',
3180                                 'ar_title'      => 'page_title',
3181                                 'ar_comment'    => 'rev_comment',
3182                                 'ar_user'       => 'rev_user',
3183                                 'ar_user_text'  => 'rev_user_text',
3184                                 'ar_timestamp'  => 'rev_timestamp',
3185                                 'ar_minor_edit' => 'rev_minor_edit',
3186                                 'ar_rev_id'     => 'rev_id',
3187                                 'ar_text_id'    => 'rev_text_id',
3188                                 'ar_text'       => '\'\'', // Be explicit to appease
3189                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3190                                 'ar_len'        => 'rev_len',
3191                                 'ar_page_id'    => 'page_id',
3192                                 'ar_deleted'    => $bitfield
3193                         ), array(
3194                                 'page_id' => $id,
3195                                 'page_id = rev_page'
3196                         ), __METHOD__
3197                 );
3198
3199                 # Delete restrictions for it
3200                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3201
3202                 # Now that it's safely backed up, delete it
3203                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3204                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3205
3206                 if ( !$ok ) {
3207                         $dbw->rollback();
3208                         return false;
3209                 }
3210
3211                 # Fix category table counts
3212                 $cats = array();
3213                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3214
3215                 foreach ( $res as $row ) {
3216                         $cats [] = $row->cl_to;
3217                 }
3218
3219                 $this->updateCategoryCounts( array(), $cats );
3220
3221                 # If using cascading deletes, we can skip some explicit deletes
3222                 if ( !$dbw->cascadingDeletes() ) {
3223                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3224
3225                         if ( $wgUseTrackbacks )
3226                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3227
3228                         # Delete outgoing links
3229                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3230                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3231                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3232                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3233                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3234                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3235                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3236                 }
3237
3238                 # If using cleanup triggers, we can skip some manual deletes
3239                 if ( !$dbw->cleanupTriggers() ) {
3240                         # Clean up recentchanges entries...
3241                         $dbw->delete( 'recentchanges',
3242                                 array( 'rc_type != ' . RC_LOG,
3243                                         'rc_namespace' => $this->mTitle->getNamespace(),
3244                                         'rc_title' => $this->mTitle->getDBkey() ),
3245                                 __METHOD__ );
3246                         $dbw->delete( 'recentchanges',
3247                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3248                                 __METHOD__ );
3249                 }
3250
3251                 # Clear caches
3252                 Article::onArticleDelete( $this->mTitle );
3253
3254                 # Clear the cached article id so the interface doesn't act like we exist
3255                 $this->mTitle->resetArticleID( 0 );
3256
3257                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3258                 $logtype = $suppress ? 'suppress' : 'delete';
3259                 $log = new LogPage( $logtype );
3260
3261                 # Make sure logging got through
3262                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3263
3264                 if ( $commit ) {
3265                         $dbw->commit();
3266                 }
3267
3268                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3269                 return true;
3270         }
3271
3272         /**
3273          * Roll back the most recent consecutive set of edits to a page
3274          * from the same user; fails if there are no eligible edits to
3275          * roll back to, e.g. user is the sole contributor. This function
3276          * performs permissions checks on $wgUser, then calls commitRollback()
3277          * to do the dirty work
3278          *
3279          * @param $fromP String: Name of the user whose edits to rollback.
3280          * @param $summary String: Custom summary. Set to default summary if empty.
3281          * @param $token String: Rollback token.
3282          * @param $bot Boolean: If true, mark all reverted edits as bot.
3283          *
3284          * @param $resultDetails Array: contains result-specific array of additional values
3285          *    'alreadyrolled' : 'current' (rev)
3286          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3287          *
3288          * @return array of errors, each error formatted as
3289          *   array(messagekey, param1, param2, ...).
3290          * On success, the array is empty.  This array can also be passed to
3291          * OutputPage::showPermissionsErrorPage().
3292          */
3293         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3294                 global $wgUser;
3295
3296                 $resultDetails = null;
3297
3298                 # Check permissions
3299                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3300                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3301                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3302
3303                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3304                         $errors[] = array( 'sessionfailure' );
3305                 }
3306
3307                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3308                         $errors[] = array( 'actionthrottledtext' );
3309                 }
3310
3311                 # If there were errors, bail out now
3312                 if ( !empty( $errors ) ) {
3313                         return $errors;
3314                 }
3315
3316                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3317         }
3318
3319         /**
3320          * Backend implementation of doRollback(), please refer there for parameter
3321          * and return value documentation
3322          *
3323          * NOTE: This function does NOT check ANY permissions, it just commits the
3324          * rollback to the DB Therefore, you should only call this function direct-
3325          * ly if you want to use custom permissions checks. If you don't, use
3326          * doRollback() instead.
3327          */
3328         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3329                 global $wgUseRCPatrol, $wgUser, $wgLang;
3330
3331                 $dbw = wfGetDB( DB_MASTER );
3332
3333                 if ( wfReadOnly() ) {
3334                         return array( array( 'readonlytext' ) );
3335                 }
3336
3337                 # Get the last editor
3338                 $current = Revision::newFromTitle( $this->mTitle );
3339                 if ( is_null( $current ) ) {
3340                         # Something wrong... no page?
3341                         return array( array( 'notanarticle' ) );
3342                 }
3343
3344                 $from = str_replace( '_', ' ', $fromP );
3345                 # User name given should match up with the top revision.
3346                 # If the user was deleted then $from should be empty.
3347                 if ( $from != $current->getUserText() ) {
3348                         $resultDetails = array( 'current' => $current );
3349                         return array( array( 'alreadyrolled',
3350                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3351                                 htmlspecialchars( $fromP ),
3352                                 htmlspecialchars( $current->getUserText() )
3353                         ) );
3354                 }
3355
3356                 # Get the last edit not by this guy...
3357                 # Note: these may not be public values
3358                 $user = intval( $current->getRawUser() );
3359                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3360                 $s = $dbw->selectRow( 'revision',
3361                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3362                         array( 'rev_page' => $current->getPage(),
3363                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3364                         ), __METHOD__,
3365                         array( 'USE INDEX' => 'page_timestamp',
3366                                 'ORDER BY' => 'rev_timestamp DESC' )
3367                         );
3368                 if ( $s === false ) {
3369                         # No one else ever edited this page
3370                         return array( array( 'cantrollback' ) );
3371                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3372                         # Only admins can see this text
3373                         return array( array( 'notvisiblerev' ) );
3374                 }
3375
3376                 $set = array();
3377                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3378                         # Mark all reverted edits as bot
3379                         $set['rc_bot'] = 1;
3380                 }
3381
3382                 if ( $wgUseRCPatrol ) {
3383                         # Mark all reverted edits as patrolled
3384                         $set['rc_patrolled'] = 1;
3385                 }
3386
3387                 if ( count( $set ) ) {
3388                         $dbw->update( 'recentchanges', $set,
3389                                 array( /* WHERE */
3390                                         'rc_cur_id' => $current->getPage(),
3391                                         'rc_user_text' => $current->getUserText(),
3392                                         "rc_timestamp > '{$s->rev_timestamp}'",
3393                                 ), __METHOD__
3394                         );
3395                 }
3396
3397                 # Generate the edit summary if necessary
3398                 $target = Revision::newFromId( $s->rev_id );
3399                 if ( empty( $summary ) ) {
3400                         if ( $from == '' ) { // no public user name
3401                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3402                         } else {
3403                                 $summary = wfMsgForContent( 'revertpage' );
3404                         }
3405                 }
3406
3407                 # Allow the custom summary to use the same args as the default message
3408                 $args = array(
3409                         $target->getUserText(), $from, $s->rev_id,
3410                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3411                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3412                 );
3413                 $summary = wfMsgReplaceArgs( $summary, $args );
3414
3415                 # Save
3416                 $flags = EDIT_UPDATE;
3417
3418                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3419                         $flags |= EDIT_MINOR;
3420                 }
3421
3422                 if ( $bot && ( $wgUser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3423                         $flags |= EDIT_FORCE_BOT;
3424                 }
3425
3426                 # Actually store the edit
3427                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3428                 if ( !empty( $status->value['revision'] ) ) {
3429                         $revId = $status->value['revision']->getId();
3430                 } else {
3431                         $revId = false;
3432                 }
3433
3434                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3435
3436                 $resultDetails = array(
3437                         'summary' => $summary,
3438                         'current' => $current,
3439                         'target'  => $target,
3440                         'newid'   => $revId
3441                 );
3442
3443                 return array();
3444         }
3445
3446         /**
3447          * User interface for rollback operations
3448          */
3449         public function rollback() {
3450                 global $wgUser, $wgOut, $wgRequest;
3451
3452                 $details = null;
3453
3454                 $result = $this->doRollback(
3455                         $wgRequest->getVal( 'from' ),
3456                         $wgRequest->getText( 'summary' ),
3457                         $wgRequest->getVal( 'token' ),
3458                         $wgRequest->getBool( 'bot' ),
3459                         $details
3460                 );
3461
3462                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3463                         $wgOut->rateLimited();
3464                         return;
3465                 }
3466
3467                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3468                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3469                         $errArray = $result[0];
3470                         $errMsg = array_shift( $errArray );
3471                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3472
3473                         if ( isset( $details['current'] ) ) {
3474                                 $current = $details['current'];
3475
3476                                 if ( $current->getComment() != '' ) {
3477                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3478                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3479                                 }
3480                         }
3481
3482                         return;
3483                 }
3484
3485                 # Display permissions errors before read-only message -- there's no
3486                 # point in misleading the user into thinking the inability to rollback
3487                 # is only temporary.
3488                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3489                         # array_diff is completely broken for arrays of arrays, sigh.
3490                         # Remove any 'readonlytext' error manually.
3491                         $out = array();
3492                         foreach ( $result as $error ) {
3493                                 if ( $error != array( 'readonlytext' ) ) {
3494                                         $out [] = $error;
3495                                 }
3496                         }
3497                         $wgOut->showPermissionsErrorPage( $out );
3498
3499                         return;
3500                 }
3501
3502                 if ( $result == array( array( 'readonlytext' ) ) ) {
3503                         $wgOut->readOnlyPage();
3504
3505                         return;
3506                 }
3507
3508                 $current = $details['current'];
3509                 $target = $details['target'];
3510                 $newId = $details['newid'];
3511                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3512                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3513
3514                 if ( $current->getUserText() === '' ) {
3515                         $old = wfMsg( 'rev-deleted-user' );
3516                 } else {
3517                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3518                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3519                 }
3520
3521                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3522                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3523                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3524                 $wgOut->returnToMain( false, $this->mTitle );
3525
3526                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3527                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3528                         $de->showDiff( '', '' );
3529                 }
3530         }
3531
3532         /**
3533          * Do standard deferred updates after page view
3534          */
3535         public function viewUpdates() {
3536                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3537                 if ( wfReadOnly() ) {
3538                         return;
3539                 }
3540
3541                 # Don't update page view counters on views from bot users (bug 14044)
3542                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3543                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
3544                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
3545                 }
3546
3547                 # Update newtalk / watchlist notification status
3548                 $wgUser->clearNotification( $this->mTitle );
3549         }
3550
3551         /**
3552          * Prepare text which is about to be saved.
3553          * Returns a stdclass with source, pst and output members
3554          */
3555         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
3556                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3557                         // Already prepared
3558                         return $this->mPreparedEdit;
3559                 }
3560
3561                 global $wgParser;
3562
3563                 if( $user === null ) {
3564                         global $wgUser;
3565                         $user = $wgUser;
3566                 }
3567                 $popts = ParserOptions::newFromUser( $user );
3568                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
3569
3570                 $edit = (object)array();
3571                 $edit->revid = $revid;
3572                 $edit->newText = $text;
3573                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
3574                 $edit->popts = $this->getParserOptions();
3575                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3576                 $edit->oldText = $this->getRawText();
3577
3578                 $this->mPreparedEdit = $edit;
3579
3580                 return $edit;
3581         }
3582
3583         /**
3584          * Do standard deferred updates after page edit.
3585          * Update links tables, site stats, search index and message cache.
3586          * Purges pages that include this page if the text was changed here.
3587          * Every 100th edit, prune the recent changes table.
3588          *
3589          * @private
3590          * @param $text String: New text of the article
3591          * @param $summary String: Edit summary
3592          * @param $minoredit Boolean: Minor edit
3593          * @param $timestamp_of_pagechange String timestamp associated with the page change
3594          * @param $newid Integer: rev_id value of the new revision
3595          * @param $changed Boolean: Whether or not the content actually changed
3596          * @param $user User object: User doing the edit
3597          */
3598         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true, User $user = null ) {
3599                 global $wgDeferredUpdateList, $wgUser, $wgEnableParserCache;
3600
3601                 wfProfileIn( __METHOD__ );
3602
3603                 # Parse the text
3604                 # Be careful not to double-PST: $text is usually already PST-ed once
3605                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3606                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3607                         $editInfo = $this->prepareTextForEdit( $text, $newid, $user );
3608                 } else {
3609                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3610                         $editInfo = $this->mPreparedEdit;
3611                 }
3612
3613                 # Save it to the parser cache
3614                 if ( $wgEnableParserCache ) {
3615                         $parserCache = ParserCache::singleton();
3616                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3617                 }
3618
3619                 # Update the links tables
3620                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3621                 $u->doUpdate();
3622
3623                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3624
3625                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3626                         if ( 0 == mt_rand( 0, 99 ) ) {
3627                                 // Flush old entries from the `recentchanges` table; we do this on
3628                                 // random requests so as to avoid an increase in writes for no good reason
3629                                 global $wgRCMaxAge;
3630
3631                                 $dbw = wfGetDB( DB_MASTER );
3632                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3633                                 $dbw->delete(
3634                                         'recentchanges',
3635                                         array( "rc_timestamp < '$cutoff'" ),
3636                                         __METHOD__
3637                                 );
3638                         }
3639                 }
3640
3641                 $id = $this->getID();
3642                 $title = $this->mTitle->getPrefixedDBkey();
3643                 $shortTitle = $this->mTitle->getDBkey();
3644
3645                 if ( 0 == $id ) {
3646                         wfProfileOut( __METHOD__ );
3647                         return;
3648                 }
3649
3650                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3651                 array_push( $wgDeferredUpdateList, $u );
3652                 $u = new SearchUpdate( $id, $title, $text );
3653                 array_push( $wgDeferredUpdateList, $u );
3654
3655                 # If this is another user's talk page, update newtalk
3656                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3657                 # load of user talk pages and piss people off, nor if it's a minor edit
3658                 # by a properly-flagged bot.
3659                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3660                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3661                 ) {
3662                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3663                                 $other = User::newFromName( $shortTitle, false );
3664                                 if ( !$other ) {
3665                                         wfDebug( __METHOD__ . ": invalid username\n" );
3666                                 } elseif ( User::isIP( $shortTitle ) ) {
3667                                         // An anonymous user
3668                                         $other->setNewtalk( true );
3669                                 } elseif ( $other->isLoggedIn() ) {
3670                                         $other->setNewtalk( true );
3671                                 } else {
3672                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3673                                 }
3674                         }
3675                 }
3676
3677                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3678                         MessageCache::singleton()->replace( $shortTitle, $text );
3679                 }
3680
3681                 wfProfileOut( __METHOD__ );
3682         }
3683
3684         /**
3685          * Perform article updates on a special page creation.
3686          *
3687          * @param $rev Revision object
3688          *
3689          * @todo This is a shitty interface function. Kill it and replace the
3690          * other shitty functions like editUpdates and such so it's not needed
3691          * anymore.
3692          */
3693         public function createUpdates( $rev ) {
3694                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3695                 $this->mTotalAdjustment = 1;
3696                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3697                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3698         }
3699
3700         /**
3701          * Generate the navigation links when browsing through an article revisions
3702          * It shows the information as:
3703          *   Revision as of \<date\>; view current revision
3704          *   \<- Previous version | Next Version -\>
3705          *
3706          * @param $oldid String: revision ID of this article revision
3707          */
3708         public function setOldSubtitle( $oldid = 0 ) {
3709                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3710
3711                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3712                         return;
3713                 }
3714
3715                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3716
3717                 # Cascade unhide param in links for easy deletion browsing
3718                 $extraParams = array();
3719                 if ( $wgRequest->getVal( 'unhide' ) ) {
3720                         $extraParams['unhide'] = 1;
3721                 }
3722
3723                 $revision = Revision::newFromId( $oldid );
3724
3725                 $current = ( $oldid == $this->mLatest );
3726                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3727                 $tddate = $wgLang->date( $this->mTimestamp, true );
3728                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3729                 $sk = $wgUser->getSkin();
3730                 $lnk = $current
3731                         ? wfMsgHtml( 'currentrevisionlink' )
3732                         : $sk->link(
3733                                 $this->mTitle,
3734                                 wfMsgHtml( 'currentrevisionlink' ),
3735                                 array(),
3736                                 $extraParams,
3737                                 array( 'known', 'noclasses' )
3738                         );
3739                 $curdiff = $current
3740                         ? wfMsgHtml( 'diff' )
3741                         : $sk->link(
3742                                 $this->mTitle,
3743                                 wfMsgHtml( 'diff' ),
3744                                 array(),
3745                                 array(
3746                                         'diff' => 'cur',
3747                                         'oldid' => $oldid
3748                                 ) + $extraParams,
3749                                 array( 'known', 'noclasses' )
3750                         );
3751                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3752                 $prevlink = $prev
3753                         ? $sk->link(
3754                                 $this->mTitle,
3755                                 wfMsgHtml( 'previousrevision' ),
3756                                 array(),
3757                                 array(
3758                                         'direction' => 'prev',
3759                                         'oldid' => $oldid
3760                                 ) + $extraParams,
3761                                 array( 'known', 'noclasses' )
3762                         )
3763                         : wfMsgHtml( 'previousrevision' );
3764                 $prevdiff = $prev
3765                         ? $sk->link(
3766                                 $this->mTitle,
3767                                 wfMsgHtml( 'diff' ),
3768                                 array(),
3769                                 array(
3770                                         'diff' => 'prev',
3771                                         'oldid' => $oldid
3772                                 ) + $extraParams,
3773                                 array( 'known', 'noclasses' )
3774                         )
3775                         : wfMsgHtml( 'diff' );
3776                 $nextlink = $current
3777                         ? wfMsgHtml( 'nextrevision' )
3778                         : $sk->link(
3779                                 $this->mTitle,
3780                                 wfMsgHtml( 'nextrevision' ),
3781                                 array(),
3782                                 array(
3783                                         'direction' => 'next',
3784                                         'oldid' => $oldid
3785                                 ) + $extraParams,
3786                                 array( 'known', 'noclasses' )
3787                         );
3788                 $nextdiff = $current
3789                         ? wfMsgHtml( 'diff' )
3790                         : $sk->link(
3791                                 $this->mTitle,
3792                                 wfMsgHtml( 'diff' ),
3793                                 array(),
3794                                 array(
3795                                         'diff' => 'next',
3796                                         'oldid' => $oldid
3797                                 ) + $extraParams,
3798                                 array( 'known', 'noclasses' )
3799                         );
3800
3801                 $cdel = '';
3802
3803                 // User can delete revisions or view deleted revisions...
3804                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3805                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3806                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3807                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3808                         } else {
3809                                 $query = array(
3810                                         'type'   => 'revision',
3811                                         'target' => $this->mTitle->getPrefixedDbkey(),
3812                                         'ids'    => $oldid
3813                                 );
3814                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3815                         }
3816                         $cdel .= ' ';
3817                 }
3818
3819                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3820                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3821
3822                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
3823                         ? 'revision-info-current'
3824                         : 'revision-info';
3825
3826                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3827                         wfMsgExt(
3828                                 $infomsg,
3829                                 array( 'parseinline', 'replaceafter' ),
3830                                 $td,
3831                                 $userlinks,
3832                                 $revision->getID(),
3833                                 $tddate,
3834                                 $tdtime,
3835                                 $revision->getUser()
3836                         ) .
3837                         "</div>\n" .
3838                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3839                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3840
3841                 $wgOut->addHTML( $r );
3842         }
3843
3844         /**
3845          * This function is called right before saving the wikitext,
3846          * so we can do things like signatures and links-in-context.
3847          *
3848          * @param $text String article contents
3849          * @param $user User object: user doing the edit, $wgUser will be used if
3850          *              null is given
3851          * @param $popts ParserOptions object: parser options, default options for
3852          *               the user loaded if null given
3853          * @return string article contents with altered wikitext markup (signatures
3854          *      converted, {{subst:}}, templates, etc.)
3855          */
3856         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3857                 global $wgParser;
3858
3859                 if ( $user === null ) {
3860                         global $wgUser;
3861                         $user = $wgUser;
3862                 }
3863
3864                 if ( $popts === null ) {
3865                         $popts = ParserOptions::newFromUser( $user );
3866                 }
3867
3868                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3869         }
3870
3871         /* Caching functions */
3872
3873         /**
3874          * checkLastModified returns true if it has taken care of all
3875          * output to the client that is necessary for this request.
3876          * (that is, it has sent a cached version of the page)
3877          *
3878          * @return boolean true if cached version send, false otherwise
3879          */
3880         protected function tryFileCache() {
3881                 static $called = false;
3882
3883                 if ( $called ) {
3884                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3885                         return false;
3886                 }
3887
3888                 $called = true;
3889                 if ( $this->isFileCacheable() ) {
3890                         $cache = new HTMLFileCache( $this->mTitle );
3891                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3892                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3893                                 $cache->loadFromFileCache();
3894                                 return true;
3895                         } else {
3896                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3897                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3898                         }
3899                 } else {
3900                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3901                 }
3902
3903                 return false;
3904         }
3905
3906         /**
3907          * Check if the page can be cached
3908          * @return bool
3909          */
3910         public function isFileCacheable() {
3911                 $cacheable = false;
3912
3913                 if ( HTMLFileCache::useFileCache() ) {
3914                         $cacheable = $this->getID() && !$this->mRedirectedFrom && !$this->mTitle->isRedirect();
3915                         // Extension may have reason to disable file caching on some pages.
3916                         if ( $cacheable ) {
3917                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3918                         }
3919                 }
3920
3921                 return $cacheable;
3922         }
3923
3924         /**
3925          * Loads page_touched and returns a value indicating if it should be used
3926          * @return boolean true if not a redirect
3927          */
3928         public function checkTouched() {
3929                 if ( !$this->mDataLoaded ) {
3930                         $this->loadPageData();
3931                 }
3932
3933                 return !$this->mIsRedirect;
3934         }
3935
3936         /**
3937          * Get the page_touched field
3938          * @return string containing GMT timestamp
3939          */
3940         public function getTouched() {
3941                 if ( !$this->mDataLoaded ) {
3942                         $this->loadPageData();
3943                 }
3944
3945                 return $this->mTouched;
3946         }
3947
3948         /**
3949          * Get the page_latest field
3950          * @return integer rev_id of current revision
3951          */
3952         public function getLatest() {
3953                 if ( !$this->mDataLoaded ) {
3954                         $this->loadPageData();
3955                 }
3956
3957                 return (int)$this->mLatest;
3958         }
3959
3960         /**
3961          * Edit an article without doing all that other stuff
3962          * The article must already exist; link tables etc
3963          * are not updated, caches are not flushed.
3964          *
3965          * @param $text String: text submitted
3966          * @param $comment String: comment submitted
3967          * @param $minor Boolean: whereas it's a minor modification
3968          */
3969         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3970                 wfProfileIn( __METHOD__ );
3971
3972                 $dbw = wfGetDB( DB_MASTER );
3973                 $revision = new Revision( array(
3974                         'page'       => $this->getId(),
3975                         'text'       => $text,
3976                         'comment'    => $comment,
3977                         'minor_edit' => $minor ? 1 : 0,
3978                         ) );
3979                 $revision->insertOn( $dbw );
3980                 $this->updateRevisionOn( $dbw, $revision );
3981
3982                 global $wgUser;
3983                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3984
3985                 wfProfileOut( __METHOD__ );
3986         }
3987
3988         /**
3989          * The onArticle*() functions are supposed to be a kind of hooks
3990          * which should be called whenever any of the specified actions
3991          * are done.
3992          *
3993          * This is a good place to put code to clear caches, for instance.
3994          *
3995          * This is called on page move and undelete, as well as edit
3996          *
3997          * @param $title Title object
3998          */
3999         public static function onArticleCreate( $title ) {
4000                 # Update existence markers on article/talk tabs...
4001                 if ( $title->isTalkPage() ) {
4002                         $other = $title->getSubjectPage();
4003                 } else {
4004                         $other = $title->getTalkPage();
4005                 }
4006
4007                 $other->invalidateCache();
4008                 $other->purgeSquid();
4009
4010                 $title->touchLinks();
4011                 $title->purgeSquid();
4012                 $title->deleteTitleProtection();
4013         }
4014
4015         /**
4016          * Clears caches when article is deleted
4017          */
4018         public static function onArticleDelete( $title ) {
4019                 # Update existence markers on article/talk tabs...
4020                 if ( $title->isTalkPage() ) {
4021                         $other = $title->getSubjectPage();
4022                 } else {
4023                         $other = $title->getTalkPage();
4024                 }
4025
4026                 $other->invalidateCache();
4027                 $other->purgeSquid();
4028
4029                 $title->touchLinks();
4030                 $title->purgeSquid();
4031
4032                 # File cache
4033                 HTMLFileCache::clearFileCache( $title );
4034
4035                 # Messages
4036                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4037                         MessageCache::singleton()->replace( $title->getDBkey(), false );
4038                 }
4039
4040                 # Images
4041                 if ( $title->getNamespace() == NS_FILE ) {
4042                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4043                         $update->doUpdate();
4044                 }
4045
4046                 # User talk pages
4047                 if ( $title->getNamespace() == NS_USER_TALK ) {
4048                         $user = User::newFromName( $title->getText(), false );
4049                         $user->setNewtalk( false );
4050                 }
4051
4052                 # Image redirects
4053                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4054         }
4055
4056         /**
4057          * Purge caches on page update etc
4058          *
4059          * @param $title Title object
4060          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4061          */
4062         public static function onArticleEdit( $title ) {
4063                 global $wgDeferredUpdateList;
4064
4065                 // Invalidate caches of articles which include this page
4066                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4067
4068                 // Invalidate the caches of all pages which redirect here
4069                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4070
4071                 # Purge squid for this page only
4072                 $title->purgeSquid();
4073
4074                 # Clear file cache for this page only
4075                 HTMLFileCache::clearFileCache( $title );
4076         }
4077
4078         /**#@-*/
4079
4080         /**
4081          * Overriden by ImagePage class, only present here to avoid a fatal error
4082          * Called for ?action=revert
4083          */
4084         public function revert() {
4085                 global $wgOut;
4086                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4087         }
4088
4089         /**
4090          * Info about this page
4091          * Called for ?action=info when $wgAllowPageInfo is on.
4092          */
4093         public function info() {
4094                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4095
4096                 if ( !$wgAllowPageInfo ) {
4097                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4098                         return;
4099                 }
4100
4101                 $page = $this->mTitle->getSubjectPage();
4102
4103                 $wgOut->setPagetitle( $page->getPrefixedText() );
4104                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4105                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4106
4107                 if ( !$this->mTitle->exists() ) {
4108                         $wgOut->addHTML( '<div class="noarticletext">' );
4109                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4110                                 // This doesn't quite make sense; the user is asking for
4111                                 // information about the _page_, not the message... -- RC
4112                                 $wgOut->addHTML( htmlspecialchars( $this->mTitle->getDefaultMessageText() ) );
4113                         } else {
4114                                 $msg = $wgUser->isLoggedIn()
4115                                         ? 'noarticletext'
4116                                         : 'noarticletextanon';
4117                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4118                         }
4119
4120                         $wgOut->addHTML( '</div>' );
4121                 } else {
4122                         $dbr = wfGetDB( DB_SLAVE );
4123                         $wl_clause = array(
4124                                 'wl_title'     => $page->getDBkey(),
4125                                 'wl_namespace' => $page->getNamespace() );
4126                         $numwatchers = $dbr->selectField(
4127                                 'watchlist',
4128                                 'COUNT(*)',
4129                                 $wl_clause,
4130                                 __METHOD__,
4131                                 $this->getSelectOptions() );
4132
4133                         $pageInfo = $this->pageCountInfo( $page );
4134                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4135
4136
4137                         //FIXME: unescaped messages
4138                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4139                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4140
4141                         if ( $talkInfo ) {
4142                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4143                         }
4144
4145                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4146
4147                         if ( $talkInfo ) {
4148                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4149                         }
4150
4151                         $wgOut->addHTML( '</ul>' );
4152                 }
4153         }
4154
4155         /**
4156          * Return the total number of edits and number of unique editors
4157          * on a given page. If page does not exist, returns false.
4158          *
4159          * @param $title Title object
4160          * @return mixed array or boolean false
4161          */
4162         public function pageCountInfo( $title ) {
4163                 $id = $title->getArticleId();
4164
4165                 if ( $id == 0 ) {
4166                         return false;
4167                 }
4168
4169                 $dbr = wfGetDB( DB_SLAVE );
4170                 $rev_clause = array( 'rev_page' => $id );
4171                 $edits = $dbr->selectField(
4172                         'revision',
4173                         'COUNT(rev_page)',
4174                         $rev_clause,
4175                         __METHOD__,
4176                         $this->getSelectOptions()
4177                 );
4178                 $authors = $dbr->selectField(
4179                         'revision',
4180                         'COUNT(DISTINCT rev_user_text)',
4181                         $rev_clause,
4182                         __METHOD__,
4183                         $this->getSelectOptions()
4184                 );
4185
4186                 return array( 'edits' => $edits, 'authors' => $authors );
4187         }
4188
4189         /**
4190          * Return a list of templates used by this article.
4191          * Uses the templatelinks table
4192          *
4193          * @return Array of Title objects
4194          */
4195         public function getUsedTemplates() {
4196                 $result = array();
4197                 $id = $this->mTitle->getArticleID();
4198
4199                 if ( $id == 0 ) {
4200                         return array();
4201                 }
4202
4203                 $dbr = wfGetDB( DB_SLAVE );
4204                 $res = $dbr->select( array( 'templatelinks' ),
4205                         array( 'tl_namespace', 'tl_title' ),
4206                         array( 'tl_from' => $id ),
4207                         __METHOD__ );
4208
4209                 if ( $res !== false ) {
4210                         foreach ( $res as $row ) {
4211                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4212                         }
4213                 }
4214
4215                 return $result;
4216         }
4217
4218         /**
4219          * Returns a list of hidden categories this page is a member of.
4220          * Uses the page_props and categorylinks tables.
4221          *
4222          * @return Array of Title objects
4223          */
4224         public function getHiddenCategories() {
4225                 $result = array();
4226                 $id = $this->mTitle->getArticleID();
4227
4228                 if ( $id == 0 ) {
4229                         return array();
4230                 }
4231
4232                 $dbr = wfGetDB( DB_SLAVE );
4233                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4234                         array( 'cl_to' ),
4235                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4236                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4237                         __METHOD__ );
4238
4239                 if ( $res !== false ) {
4240                         foreach ( $res as $row ) {
4241                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4242                         }
4243                 }
4244
4245                 return $result;
4246         }
4247
4248         /**
4249         * Return an applicable autosummary if one exists for the given edit.
4250         * @param $oldtext String: the previous text of the page.
4251         * @param $newtext String: The submitted text of the page.
4252         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
4253         * @return string An appropriate autosummary, or an empty string.
4254         */
4255         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4256                 global $wgContLang;
4257
4258                 # Decide what kind of autosummary is needed.
4259
4260                 # Redirect autosummaries
4261                 $ot = Title::newFromRedirect( $oldtext );
4262                 $rt = Title::newFromRedirect( $newtext );
4263
4264                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4265                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4266                 }
4267
4268                 # New page autosummaries
4269                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4270                         # If they're making a new article, give its text, truncated, in the summary.
4271
4272                         $truncatedtext = $wgContLang->truncate(
4273                                 str_replace( "\n", ' ', $newtext ),
4274                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4275
4276                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4277                 }
4278
4279                 # Blanking autosummaries
4280                 if ( $oldtext != '' && $newtext == '' ) {
4281                         return wfMsgForContent( 'autosumm-blank' );
4282                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4283                         # Removing more than 90% of the article
4284
4285                         $truncatedtext = $wgContLang->truncate(
4286                                 $newtext,
4287                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4288
4289                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4290                 }
4291
4292                 # If we reach this point, there's no applicable autosummary for our case, so our
4293                 # autosummary is empty.
4294                 return '';
4295         }
4296
4297         /**
4298          * Add the primary page-view wikitext to the output buffer
4299          * Saves the text into the parser cache if possible.
4300          * Updates templatelinks if it is out of date.
4301          *
4302          * @param $text String
4303          * @param $cache Boolean
4304          * @param $parserOptions mixed ParserOptions object, or boolean false
4305          */
4306         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4307                 global $wgOut;
4308
4309                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4310                 $wgOut->addParserOutput( $this->mParserOutput );
4311         }
4312
4313         /**
4314          * This does all the heavy lifting for outputWikitext, except it returns the parser
4315          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4316          * say, embedding thread pages within a discussion system (LiquidThreads)
4317          *
4318          * @param $text string
4319          * @param $cache boolean
4320          * @param $parserOptions parsing options, defaults to false
4321          * @return string containing parsed output
4322          */
4323         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4324                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4325
4326                 if ( !$parserOptions ) {
4327                         $parserOptions = $this->getParserOptions();
4328                 }
4329
4330                 $time = - wfTime();
4331                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4332                         $parserOptions, true, true, $this->getRevIdFetched() );
4333                 $time += wfTime();
4334
4335                 # Timing hack
4336                 if ( $time > 3 ) {
4337                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4338                                 $this->mTitle->getPrefixedDBkey() ) );
4339                 }
4340
4341                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4342                         $parserCache = ParserCache::singleton();
4343                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4344                 }
4345
4346                 // Make sure file cache is not used on uncacheable content.
4347                 // Output that has magic words in it can still use the parser cache
4348                 // (if enabled), though it will generally expire sooner.
4349                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4350                         $wgUseFileCache = false;
4351                 }
4352
4353                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4354
4355                 return $this->mParserOutput;
4356         }
4357
4358         /**
4359          * Get parser options suitable for rendering the primary article wikitext
4360          * @return mixed ParserOptions object or boolean false
4361          */
4362         public function getParserOptions() {
4363                 global $wgUser;
4364
4365                 if ( !$this->mParserOptions ) {
4366                         $this->mParserOptions = new ParserOptions( $wgUser );
4367                         $this->mParserOptions->setTidy( true );
4368                         $this->mParserOptions->enableLimitReport();
4369                 }
4370
4371                 // Clone to allow modifications of the return value without affecting
4372                 // the cache
4373                 return clone $this->mParserOptions;
4374         }
4375
4376         /**
4377          * Updates cascading protections
4378          *
4379          * @param $parserOutput mixed ParserOptions object, or boolean false
4380          **/
4381         protected function doCascadeProtectionUpdates( $parserOutput ) {
4382                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4383                         return;
4384                 }
4385
4386                 // templatelinks table may have become out of sync,
4387                 // especially if using variable-based transclusions.
4388                 // For paranoia, check if things have changed and if
4389                 // so apply updates to the database. This will ensure
4390                 // that cascaded protections apply as soon as the changes
4391                 // are visible.
4392
4393                 # Get templates from templatelinks
4394                 $id = $this->mTitle->getArticleID();
4395
4396                 $tlTemplates = array();
4397
4398                 $dbr = wfGetDB( DB_SLAVE );
4399                 $res = $dbr->select( array( 'templatelinks' ),
4400                         array( 'tl_namespace', 'tl_title' ),
4401                         array( 'tl_from' => $id ),
4402                         __METHOD__
4403                 );
4404
4405                 foreach ( $res as $row ) {
4406                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4407                 }
4408
4409                 # Get templates from parser output.
4410                 $poTemplates = array();
4411                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4412                         foreach ( $templates as $dbk => $id ) {
4413                                 $poTemplates["$ns:$dbk"] = true;
4414                         }
4415                 }
4416
4417                 # Get the diff
4418                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4419
4420                 if ( count( $templates_diff ) > 0 ) {
4421                         # Whee, link updates time.
4422                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4423                         $u->doUpdate();
4424                 }
4425         }
4426
4427         /**
4428          * Update all the appropriate counts in the category table, given that
4429          * we've added the categories $added and deleted the categories $deleted.
4430          *
4431          * @param $added array   The names of categories that were added
4432          * @param $deleted array The names of categories that were deleted
4433          */
4434         public function updateCategoryCounts( $added, $deleted ) {
4435                 $ns = $this->mTitle->getNamespace();
4436                 $dbw = wfGetDB( DB_MASTER );
4437
4438                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4439                 # exist, we might legitimately not create it, but it's simpler to just
4440                 # create it and then give it a negative value, since the value is bogus
4441                 # anyway.
4442                 #
4443                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4444                 $insertCats = array_merge( $added, $deleted );
4445                 if ( !$insertCats ) {
4446                         # Okay, nothing to do
4447                         return;
4448                 }
4449
4450                 $insertRows = array();
4451
4452                 foreach ( $insertCats as $cat ) {
4453                         $insertRows[] = array(
4454                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4455                                 'cat_title' => $cat
4456                         );
4457                 }
4458                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4459
4460                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4461                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4462
4463                 if ( $ns == NS_CATEGORY ) {
4464                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4465                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4466                 } elseif ( $ns == NS_FILE ) {
4467                         $addFields[]    = 'cat_files = cat_files + 1';
4468                         $removeFields[] = 'cat_files = cat_files - 1';
4469                 }
4470
4471                 if ( $added ) {
4472                         $dbw->update(
4473                                 'category',
4474                                 $addFields,
4475                                 array( 'cat_title' => $added ),
4476                                 __METHOD__
4477                         );
4478                 }
4479
4480                 if ( $deleted ) {
4481                         $dbw->update(
4482                                 'category',
4483                                 $removeFields,
4484                                 array( 'cat_title' => $deleted ),
4485                                 __METHOD__
4486                         );
4487                 }
4488         }
4489
4490         /**
4491          * Lightweight method to get the parser output for a page, checking the parser cache
4492          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4493          * consider, so it's not appropriate to use there.
4494          *
4495          * @since 1.16 (r52326) for LiquidThreads
4496          *
4497          * @param $oldid mixed integer Revision ID or null
4498          * @return ParserOutput or false if the given revsion ID is not found
4499          */
4500         public function getParserOutput( $oldid = null ) {
4501                 global $wgEnableParserCache, $wgUser;
4502
4503                 // Should the parser cache be used?
4504                 $useParserCache = $wgEnableParserCache &&
4505                         $wgUser->getStubThreshold() == 0 &&
4506                         $this->exists() &&
4507                         $oldid === null;
4508
4509                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4510
4511                 if ( $wgUser->getStubThreshold() ) {
4512                         wfIncrStats( 'pcache_miss_stub' );
4513                 }
4514
4515                 if ( $useParserCache ) {
4516                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4517                         if ( $parserOutput !== false ) {
4518                                 return $parserOutput;
4519                         }
4520                 }
4521
4522                 // Cache miss; parse and output it.
4523                 if ( $oldid === null ) {
4524                         $text = $this->getRawText();
4525                 } else {
4526                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4527                         if ( $rev === null ) {
4528                                 return false;
4529                         }
4530                         $text = $rev->getText();
4531                 }
4532
4533                 return $this->getOutputFromWikitext( $text, $useParserCache );
4534         }
4535
4536         /**
4537          * Sets the context this Article is executed in
4538          *
4539          * @param $context RequestContext
4540          * @since 1.18
4541          */
4542         public function setContext( $context ) {
4543                 $this->mContext = $context;
4544         }
4545
4546         /**
4547          * Gets the context this Article is executed in
4548          *
4549          * @return RequestContext
4550          * @since 1.18
4551          */
4552         public function getContext() {
4553                 if ( $this->mContext instanceof RequestContext ) {
4554                         return $this->mContext;
4555                 } else {
4556                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
4557                         return RequestContext::getMain();
4558                 }
4559         }
4560
4561 }
4562
4563 class PoolWorkArticleView extends PoolCounterWork {
4564         private $mArticle;
4565
4566         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4567                 parent::__construct( 'ArticleView', $key );
4568                 $this->mArticle = $article;
4569                 $this->cacheable = $useParserCache;
4570                 $this->parserOptions = $parserOptions;
4571         }
4572
4573         function doWork() {
4574                 return $this->mArticle->doViewParse();
4575         }
4576
4577         function getCachedWork() {
4578                 global $wgOut;
4579
4580                 $parserCache = ParserCache::singleton();
4581                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4582
4583                 if ( $this->mArticle->mParserOutput !== false ) {
4584                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4585                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4586                         # Ensure that UI elements requiring revision ID have
4587                         # the correct version information.
4588                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4589                         return true;
4590                 }
4591                 return false;
4592         }
4593
4594         function fallback() {
4595                 return $this->mArticle->tryDirtyCache();
4596         }
4597
4598         function error( $status ) {
4599                 global $wgOut;
4600
4601                 $wgOut->clearHTML(); // for release() errors
4602                 $wgOut->enableClientCache( false );
4603                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4604
4605                 $errortext = $status->getWikiText( false, 'view-pool-error' );
4606                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4607
4608                 return false;
4609         }
4610 }