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         var $mComment = '';               // !<
  21         var $mContent;                    // !<
  22         var $mContentLoaded = false;      // !<
  23         var $mCounter = -1;               // !< Not loaded
  24         var $mCurID = -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 $mMinorEdit;                  // !<
  31         var $mOldId;                      // !<
  32         var $mPreparedEdit = false;       // !< Title object if set
  33         var $mRedirectedFrom = null;      // !< Title object if set
  34         var $mRedirectTarget = null;      // !< Title object if set
  35         var $mRedirectUrl = false;        // !<
  36         var $mRevIdFetched = 0;           // !<
  37         var $mRevision;                   // !< Revision object if set
  38         var $mTimestamp = '';             // !<
  39         var $mTitle;                      // !< Title object
  40         var $mTotalAdjustment = 0;        // !<
  41         var $mTouched = '19700101000000'; // !<
  42         var $mUser = -1;                  // !< Not loaded
  43         var $mUserText = '';              // !< username from Revision if set
  44         var $mParserOptions;              // !< ParserOptions object for $wgUser articles
  45         var $mParserOutput;               // !< ParserCache object if set
  46         /**@}}*/
  47
  48         /**
  49          * Constructor and clear the article
  50          * @param $title Reference to a Title object.
  51          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  52          */
  53         public function __construct( Title $title, $oldId = null ) {
  54                 // FIXME: does the reference play any role here?
  55                 $this->mTitle =& $title;
  56                 $this->mOldId = $oldId;
  57         }
  58
  59         /**
  60          * Constructor from an page id
  61          * @param $id The article ID to load
  62          */
  63         public static function newFromID( $id ) {
  64                 $t = Title::newFromID( $id );
  65                 # FIXME: doesn't inherit right
  66                 return $t == null ? null : new self( $t );
  67                 # return $t == null ? null : new static( $t ); // PHP 5.3
  68         }
  69
  70         /**
  71          * Tell the page view functions that this view was redirected
  72          * from another page on the wiki.
  73          * @param $from Title object.
  74          */
  75         public function setRedirectedFrom( Title $from ) {
  76                 $this->mRedirectedFrom = $from;
  77         }
  78
  79         /**
  80          * If this page is a redirect, get its target
  81          *
  82          * The target will be fetched from the redirect table if possible.
  83          * If this page doesn't have an entry there, call insertRedirect()
  84          * @return mixed Title object, or null if this page is not a redirect
  85          */
  86         public function getRedirectTarget() {
  87                 if ( !$this->mTitle->isRedirect() ) {
  88                         return null;
  89                 }
  90
  91                 if ( $this->mRedirectTarget !== null ) {
  92                         return $this->mRedirectTarget;
  93                 }
  94
  95                 # Query the redirect table
  96                 $dbr = wfGetDB( DB_SLAVE );
  97                 $row = $dbr->selectRow( 'redirect',
  98                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  99                         array( 'rd_from' => $this->getID() ),
 100                         __METHOD__
 101                 );
 102
 103                 // rd_fragment and rd_interwiki were added later, populate them if empty
 104                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 105                         return $this->mRedirectTarget = Title::makeTitle(
 106                                 $row->rd_namespace, $row->rd_title,
 107                                 $row->rd_fragment, $row->rd_interwiki );
 108                 }
 109
 110                 # This page doesn't have an entry in the redirect table
 111                 return $this->mRedirectTarget = $this->insertRedirect();
 112         }
 113
 114         /**
 115          * Insert an entry for this page into the redirect table.
 116          *
 117          * Don't call this function directly unless you know what you're doing.
 118          * @return Title object or null if not a redirect
 119          */
 120         public function insertRedirect() {
 121                 // recurse through to only get the final target
 122                 $retval = Title::newFromRedirectRecurse( $this->getContent() );
 123                 if ( !$retval ) {
 124                         return null;
 125                 }
 126                 $this->insertRedirectEntry( $retval );
 127                 return $retval;
 128         }
 129
 130         /**
 131          * Insert or update the redirect table entry for this page to indicate
 132          * it redirects to $rt .
 133          * @param $rt Title redirect target
 134          */
 135         public function insertRedirectEntry( $rt ) {
 136                 $dbw = wfGetDB( DB_MASTER );
 137                 $dbw->replace( 'redirect', array( 'rd_from' ),
 138                         array(
 139                                 'rd_from' => $this->getID(),
 140                                 'rd_namespace' => $rt->getNamespace(),
 141                                 'rd_title' => $rt->getDBkey(),
 142                                 'rd_fragment' => $rt->getFragment(),
 143                                 'rd_interwiki' => $rt->getInterwiki(),
 144                         ),
 145                         __METHOD__
 146                 );
 147         }
 148
 149         /**
 150          * Get the Title object or URL this page redirects to
 151          *
 152          * @return mixed false, Title of in-wiki target, or string with URL
 153          */
 154         public function followRedirect() {
 155                 return $this->getRedirectURL( $this->getRedirectTarget() );
 156         }
 157
 158         /**
 159          * Get the Title object this text redirects to
 160          *
 161          * @param $text string article content containing redirect info
 162          * @return mixed false, Title of in-wiki target, or string with URL
 163          * @deprecated
 164          */
 165         public function followRedirectText( $text ) {
 166                 // recurse through to only get the final target
 167                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 168         }
 169
 170         /**
 171          * Get the Title object or URL to use for a redirect. We use Title
 172          * objects for same-wiki, non-special redirects and URLs for everything
 173          * else.
 174          * @param $rt Title Redirect target
 175          * @return mixed false, Title object of local target, or string with URL
 176          */
 177         public function getRedirectURL( $rt ) {
 178                 if ( $rt ) {
 179                         if ( $rt->getInterwiki() != '' ) {
 180                                 if ( $rt->isLocal() ) {
 181                                         // Offsite wikis need an HTTP redirect.
 182                                         //
 183                                         // This can be hard to reverse and may produce loops,
 184                                         // so they may be disabled in the site configuration.
 185                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 186                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 187                                 }
 188                         } else {
 189                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 190                                         // Gotta handle redirects to special pages differently:
 191                                         // Fill the HTTP response "Location" header and ignore
 192                                         // the rest of the page we're on.
 193                                         //
 194                                         // This can be hard to reverse, so they may be disabled.
 195                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 196                                                 // rolleyes
 197                                         } else {
 198                                                 return $rt->getFullURL();
 199                                         }
 200                                 }
 201
 202                                 return $rt;
 203                         }
 204                 }
 205
 206                 // No or invalid redirect
 207                 return false;
 208         }
 209
 210         /**
 211          * Get the title object of the article
 212          * @return Title object of this page
 213          */
 214         public function getTitle() {
 215                 return $this->mTitle;
 216         }
 217
 218         /**
 219          * Clear the object
 220          * FIXME: shouldn't this be public?
 221          * @private
 222          */
 223         public function clear() {
 224                 $this->mDataLoaded    = false;
 225                 $this->mContentLoaded = false;
 226
 227                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 228                 $this->mRedirectedFrom = null; # Title object if set
 229                 $this->mRedirectTarget = null; # Title object if set
 230                 $this->mUserText =
 231                 $this->mTimestamp = $this->mComment = '';
 232                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 233                 $this->mTouched = '19700101000000';
 234                 $this->mForUpdate = false;
 235                 $this->mIsRedirect = false;
 236                 $this->mRevIdFetched = 0;
 237                 $this->mRedirectUrl = false;
 238                 $this->mLatest = false;
 239                 $this->mPreparedEdit = false;
 240         }
 241
 242         /**
 243          * Note that getContent/loadContent do not follow redirects anymore.
 244          * If you need to fetch redirectable content easily, try
 245          * the shortcut in Article::followRedirect()
 246          *
 247          * This function has side effects! Do not use this function if you
 248          * only want the real revision text if any.
 249          *
 250          * @return Return the text of this revision
 251          */
 252         public function getContent() {
 253                 global $wgUser, $wgContLang, $wgMessageCache;
 254
 255                 wfProfileIn( __METHOD__ );
 256
 257                 if ( $this->getID() === 0 ) {
 258                         # If this is a MediaWiki:x message, then load the messages
 259                         # and return the message value for x.
 260                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 261                                 # If this is a system message, get the default text.
 262                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 263                                 $text = wfMsgGetKey( $message, false, $lang, false );
 264
 265                                 if ( wfEmptyMsg( $message, $text ) )
 266                                         $text = '';
 267                         } else {
 268                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 269                         }
 270                         wfProfileOut( __METHOD__ );
 271
 272                         return $text;
 273                 } else {
 274                         $this->loadContent();
 275                         wfProfileOut( __METHOD__ );
 276
 277                         return $this->mContent;
 278                 }
 279         }
 280
 281         /**
 282          * Get the text of the current revision. No side-effects...
 283          *
 284          * @return Return the text of the current revision
 285          */
 286         public function getRawText() {
 287                 // Check process cache for current revision
 288                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 289                         return $this->mContent;
 290                 }
 291
 292                 $rev = Revision::newFromTitle( $this->mTitle );
 293                 $text = $rev ? $rev->getRawText() : false;
 294
 295                 return $text;
 296         }
 297
 298         /**
 299          * This function returns the text of a section, specified by a number ($section).
 300          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 301          * the first section before any such heading (section 0).
 302          *
 303          * If a section contains subsections, these are also returned.
 304          *
 305          * @param $text String: text to look in
 306          * @param $section Integer: section number
 307          * @return string text of the requested section
 308          * @deprecated
 309          */
 310         public function getSection( $text, $section ) {
 311                 global $wgParser;
 312                 return $wgParser->getSection( $text, $section );
 313         }
 314
 315         /**
 316          * Get the text that needs to be saved in order to undo all revisions
 317          * between $undo and $undoafter. Revisions must belong to the same page,
 318          * must exist and must not be deleted
 319          * @param $undo Revision
 320          * @param $undoafter Revision Must be an earlier revision than $undo
 321          * @return mixed string on success, false on failure
 322          */
 323         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 324                 $currentRev = Revision::newFromTitle( $this->mTitle );
 325                 if ( !$currentRev ) {
 326                         return false; // no page
 327                 }
 328                 $undo_text = $undo->getText();
 329                 $undoafter_text = $undoafter->getText();
 330                 $cur_text = $currentRev->getText();
 331
 332                 if ( $cur_text == $undo_text ) {
 333                         # No use doing a merge if it's just a straight revert.
 334                         return $undoafter_text;
 335                 }
 336
 337                 $undone_text = '';
 338
 339                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 340                         return false;
 341                 }
 342
 343                 return $undone_text;
 344         }
 345
 346         /**
 347          * @return int The oldid of the article that is to be shown, 0 for the
 348          *             current revision
 349          */
 350         public function getOldID() {
 351                 if ( is_null( $this->mOldId ) ) {
 352                         $this->mOldId = $this->getOldIDFromRequest();
 353                 }
 354
 355                 return $this->mOldId;
 356         }
 357
 358         /**
 359          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 360          *
 361          * @return int The old id for the request
 362          */
 363         public function getOldIDFromRequest() {
 364                 global $wgRequest;
 365
 366                 $this->mRedirectUrl = false;
 367
 368                 $oldid = $wgRequest->getVal( 'oldid' );
 369
 370                 if ( isset( $oldid ) ) {
 371                         $oldid = intval( $oldid );
 372                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 373                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 374                                 if ( $nextid ) {
 375                                         $oldid = $nextid;
 376                                 } else {
 377                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 378                                 }
 379                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 380                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 381                                 if ( $previd ) {
 382                                         $oldid = $previd;
 383                                 }
 384                         }
 385                 }
 386
 387                 if ( !$oldid ) {
 388                         $oldid = 0;
 389                 }
 390
 391                 return $oldid;
 392         }
 393
 394         /**
 395          * Load the revision (including text) into this object
 396          */
 397         function loadContent() {
 398                 if ( $this->mContentLoaded ) {
 399                         return;
 400                 }
 401
 402                 wfProfileIn( __METHOD__ );
 403
 404                 $this->fetchContent( $this->getOldID() );
 405
 406                 wfProfileOut( __METHOD__ );
 407         }
 408
 409         /**
 410          * Fetch a page record with the given conditions
 411          * @param $dbr Database object
 412          * @param $conditions Array
 413          * @return mixed Database result resource, or false on failure
 414          */
 415         protected function pageData( $dbr, $conditions ) {
 416                 $fields = array(
 417                                 'page_id',
 418                                 'page_namespace',
 419                                 'page_title',
 420                                 'page_restrictions',
 421                                 'page_counter',
 422                                 'page_is_redirect',
 423                                 'page_is_new',
 424                                 'page_random',
 425                                 'page_touched',
 426                                 'page_latest',
 427                                 'page_len',
 428                 );
 429
 430                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 431
 432                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 433
 434                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 435
 436                 return $row;
 437         }
 438
 439         /**
 440          * Fetch a page record matching the Title object's namespace and title
 441          * using a sanitized title string
 442          *
 443          * @param $dbr Database object
 444          * @param $title Title object
 445          * @return mixed Database result resource, or false on failure
 446          */
 447         public function pageDataFromTitle( $dbr, $title ) {
 448                 return $this->pageData( $dbr, array(
 449                         'page_namespace' => $title->getNamespace(),
 450                         'page_title'     => $title->getDBkey() ) );
 451         }
 452
 453         /**
 454          * Fetch a page record matching the requested ID
 455          *
 456          * @param $dbr Database
 457          * @param $id Integer
 458          */
 459         protected function pageDataFromId( $dbr, $id ) {
 460                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 461         }
 462
 463         /**
 464          * Set the general counter, title etc data loaded from
 465          * some source.
 466          *
 467          * @param $data Database row object or "fromdb"
 468          */
 469         public function loadPageData( $data = 'fromdb' ) {
 470                 if ( $data === 'fromdb' ) {
 471                         $dbr = wfGetDB( DB_MASTER );
 472                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 473                 }
 474
 475                 $lc = LinkCache::singleton();
 476
 477                 if ( $data ) {
 478                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 479
 480                         $this->mTitle->mArticleID = intval( $data->page_id );
 481
 482                         # Old-fashioned restrictions
 483                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 484
 485                         $this->mCounter     = intval( $data->page_counter );
 486                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 487                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 488                         $this->mLatest      = intval( $data->page_latest );
 489                 } else {
 490                         $lc->addBadLinkObj( $this->mTitle );
 491                         $this->mTitle->mArticleID = 0;
 492                 }
 493
 494                 $this->mDataLoaded = true;
 495         }
 496
 497         /**
 498          * Get text of an article from database
 499          * Does *NOT* follow redirects.
 500          *
 501          * @param $oldid Int: 0 for whatever the latest revision is
 502          * @return mixed string containing article contents, or false if null
 503          */
 504         function fetchContent( $oldid = 0 ) {
 505                 if ( $this->mContentLoaded ) {
 506                         return $this->mContent;
 507                 }
 508
 509                 $dbr = wfGetDB( DB_MASTER );
 510
 511                 # Pre-fill content with error message so that if something
 512                 # fails we'll have something telling us what we intended.
 513                 $t = $this->mTitle->getPrefixedText();
 514                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 515                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 516
 517                 if ( $oldid ) {
 518                         $revision = Revision::newFromId( $oldid );
 519                         if ( $revision === null ) {
 520                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 521                                 return false;
 522                         }
 523
 524                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 525
 526                         if ( !$data ) {
 527                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 528                                 return false;
 529                         }
 530
 531                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 532                         $this->loadPageData( $data );
 533                 } else {
 534                         if ( !$this->mDataLoaded ) {
 535                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 536
 537                                 if ( !$data ) {
 538                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 539                                         return false;
 540                                 }
 541
 542                                 $this->loadPageData( $data );
 543                         }
 544                         $revision = Revision::newFromId( $this->mLatest );
 545                         if (  $revision === null ) {
 546                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 547                                 return false;
 548                         }
 549                 }
 550
 551                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 552                 // We should instead work with the Revision object when we need it...
 553                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 554
 555                 $this->mUser      = $revision->getUser();
 556                 $this->mUserText  = $revision->getUserText();
 557                 $this->mComment   = $revision->getComment();
 558                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 559
 560                 $this->mRevIdFetched = $revision->getId();
 561                 $this->mContentLoaded = true;
 562                 $this->mRevision =& $revision;
 563
 564                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 565
 566                 return $this->mContent;
 567         }
 568
 569         /**
 570          * Read/write accessor to select FOR UPDATE
 571          *
 572          * @param $x Mixed: FIXME
 573          * @return mixed value of $x, or value stored in Article::mForUpdate
 574          */
 575         public function forUpdate( $x = null ) {
 576                 return wfSetVar( $this->mForUpdate, $x );
 577         }
 578
 579         /**
 580          * Get options for all SELECT statements
 581          *
 582          * @param $options Array: an optional options array which'll be appended to
 583          *                       the default
 584          * @return Array: options
 585          */
 586         protected function getSelectOptions( $options = '' ) {
 587                 if ( $this->mForUpdate ) {
 588                         if ( is_array( $options ) ) {
 589                                 $options[] = 'FOR UPDATE';
 590                         } else {
 591                                 $options = 'FOR UPDATE';
 592                         }
 593                 }
 594
 595                 return $options;
 596         }
 597
 598         /**
 599          * @return int Page ID
 600          */
 601         public function getID() {
 602                 return $this->mTitle->getArticleID();
 603         }
 604
 605         /**
 606          * @return bool Whether or not the page exists in the database
 607          */
 608         public function exists() {
 609                 return $this->getId() > 0;
 610         }
 611
 612         /**
 613          * Check if this page is something we're going to be showing
 614          * some sort of sensible content for. If we return false, page
 615          * views (plain action=view) will return an HTTP 404 response,
 616          * so spiders and robots can know they're following a bad link.
 617          *
 618          * @return bool
 619          */
 620         public function hasViewableContent() {
 621                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 622         }
 623
 624         /**
 625          * @return int The view count for the page
 626          */
 627         public function getCount() {
 628                 if ( -1 == $this->mCounter ) {
 629                         $id = $this->getID();
 630
 631                         if ( $id == 0 ) {
 632                                 $this->mCounter = 0;
 633                         } else {
 634                                 $dbr = wfGetDB( DB_SLAVE );
 635                                 $this->mCounter = $dbr->selectField( 'page',
 636                                         'page_counter',
 637                                         array( 'page_id' => $id ),
 638                                         __METHOD__,
 639                                         $this->getSelectOptions()
 640                                 );
 641                         }
 642                 }
 643
 644                 return $this->mCounter;
 645         }
 646
 647         /**
 648          * Determine whether a page would be suitable for being counted as an
 649          * article in the site_stats table based on the title & its content
 650          *
 651          * @param $text String: text to analyze
 652          * @return bool
 653          */
 654         public function isCountable( $text ) {
 655                 global $wgUseCommaCount;
 656
 657                 $token = $wgUseCommaCount ? ',' : '[[';
 658
 659                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 660         }
 661
 662         /**
 663          * Tests if the article text represents a redirect
 664          *
 665          * @param $text mixed string containing article contents, or boolean
 666          * @return bool
 667          */
 668         public function isRedirect( $text = false ) {
 669                 if ( $text === false ) {
 670                         if ( !$this->mDataLoaded ) {
 671                                 $this->loadPageData();
 672                         }
 673
 674                         return (bool)$this->mIsRedirect;
 675                 } else {
 676                         return Title::newFromRedirect( $text ) !== null;
 677                 }
 678         }
 679
 680         /**
 681          * Returns true if the currently-referenced revision is the current edit
 682          * to this page (and it exists).
 683          * @return bool
 684          */
 685         public function isCurrent() {
 686                 # If no oldid, this is the current version.
 687                 if ( $this->getOldID() == 0 ) {
 688                         return true;
 689                 }
 690
 691                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 692         }
 693
 694         /**
 695          * Loads everything except the text
 696          * This isn't necessary for all uses, so it's only done if needed.
 697          */
 698         protected function loadLastEdit() {
 699                 if ( -1 != $this->mUser ) {
 700                         return;
 701                 }
 702
 703                 # New or non-existent articles have no user information
 704                 $id = $this->getID();
 705                 if ( 0 == $id ) {
 706                         return;
 707                 }
 708
 709                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 710                 if ( !is_null( $this->mLastRevision ) ) {
 711                         $this->mUser      = $this->mLastRevision->getUser();
 712                         $this->mUserText  = $this->mLastRevision->getUserText();
 713                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 714                         $this->mComment   = $this->mLastRevision->getComment();
 715                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 716                         $this->mRevIdFetched = $this->mLastRevision->getId();
 717                 }
 718         }
 719
 720         /**
 721          * @return string GMT timestamp of last article revision
 722          **/
 723
 724         public function getTimestamp() {
 725                 // Check if the field has been filled by ParserCache::get()
 726                 if ( !$this->mTimestamp ) {
 727                         $this->loadLastEdit();
 728                 }
 729
 730                 return wfTimestamp( TS_MW, $this->mTimestamp );
 731         }
 732
 733         /**
 734          * @return int user ID for the user that made the last article revision
 735          */
 736         public function getUser() {
 737                 $this->loadLastEdit();
 738                 return $this->mUser;
 739         }
 740
 741         /**
 742          * @return string username of the user that made the last article revision
 743          */
 744         public function getUserText() {
 745                 $this->loadLastEdit();
 746                 return $this->mUserText;
 747         }
 748
 749         /**
 750          * @return string Comment stored for the last article revision
 751          */
 752         public function getComment() {
 753                 $this->loadLastEdit();
 754                 return $this->mComment;
 755         }
 756
 757         /**
 758          * Returns true if last revision was marked as "minor edit"
 759          *
 760          * @return boolean Minor edit indicator for the last article revision.
 761          */
 762         public function getMinorEdit() {
 763                 $this->loadLastEdit();
 764                 return $this->mMinorEdit;
 765         }
 766
 767         /**
 768          * Use this to fetch the rev ID used on page views
 769          *
 770          * @return int revision ID of last article revision
 771          */
 772         public function getRevIdFetched() {
 773                 $this->loadLastEdit();
 774                 return $this->mRevIdFetched;
 775         }
 776
 777         /**
 778          * FIXME: this does what?
 779          * @param $limit Integer: default 0.
 780          * @param $offset Integer: default 0.
 781          * @return UserArrayFromResult object with User objects of article contributors for requested range
 782          */
 783         public function getContributors( $limit = 0, $offset = 0 ) {
 784                 # FIXME: this is expensive; cache this info somewhere.
 785
 786                 $dbr = wfGetDB( DB_SLAVE );
 787                 $revTable = $dbr->tableName( 'revision' );
 788                 $userTable = $dbr->tableName( 'user' );
 789
 790                 $pageId = $this->getId();
 791
 792                 $user = $this->getUser();
 793
 794                 if ( $user ) {
 795                         $excludeCond = "AND rev_user != $user";
 796                 } else {
 797                         $userText = $dbr->addQuotes( $this->getUserText() );
 798                         $excludeCond = "AND rev_user_text != $userText";
 799                 }
 800
 801                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 802
 803                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 804                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 805                         WHERE rev_page = $pageId
 806                         $excludeCond
 807                         AND $deletedBit = 0
 808                         GROUP BY rev_user, rev_user_text
 809                         ORDER BY timestamp DESC";
 810
 811                 if ( $limit > 0 ) {
 812                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 813                 }
 814
 815                 $sql .= ' ' . $this->getSelectOptions();
 816                 $res = $dbr->query( $sql, __METHOD__ );
 817
 818                 return new UserArrayFromResult( $res );
 819         }
 820
 821         /**
 822          * This is the default action of the index.php entry point: just view the
 823          * page of the given title.
 824          */
 825         public function view() {
 826                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 827                 global $wgUseFileCache, $wgUseETag;
 828
 829                 wfProfileIn( __METHOD__ );
 830
 831                 # Get variables from query string
 832                 $oldid = $this->getOldID();
 833                 $parserCache = ParserCache::singleton();
 834
 835                 $parserOptions = $this->getParserOptions();
 836                 # Render printable version, use printable version cache
 837                 if ( $wgOut->isPrintable() ) {
 838                         $parserOptions->setIsPrintable( true );
 839                         $parserOptions->setEditSection( false );
 840                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 841                         $parserOptions->setEditSection( false );
 842                 }
 843
 844                 # Try client and file cache
 845                 if ( $oldid === 0 && $this->checkTouched() ) {
 846                         if ( $wgUseETag ) {
 847                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 848                         }
 849
 850                         # Is it client cached?
 851                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 852                                 wfDebug( __METHOD__ . ": done 304\n" );
 853                                 wfProfileOut( __METHOD__ );
 854
 855                                 return;
 856                         # Try file cache
 857                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 858                                 wfDebug( __METHOD__ . ": done file cache\n" );
 859                                 # tell wgOut that output is taken care of
 860                                 $wgOut->disable();
 861                                 $this->viewUpdates();
 862                                 wfProfileOut( __METHOD__ );
 863
 864                                 return;
 865                         }
 866                 }
 867
 868                 # getOldID may want us to redirect somewhere else
 869                 if ( $this->mRedirectUrl ) {
 870                         $wgOut->redirect( $this->mRedirectUrl );
 871                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 872                         wfProfileOut( __METHOD__ );
 873
 874                         return;
 875                 }
 876
 877                 $wgOut->setArticleFlag( true );
 878                 # Set page title (may be overridden by DISPLAYTITLE)
 879                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 880
 881                 # If we got diff in the query, we want to see a diff page instead of the article.
 882                 if ( $wgRequest->getCheck( 'diff' ) ) {
 883                         wfDebug( __METHOD__ . ": showing diff page\n" );
 884                         $this->showDiffPage();
 885                         wfProfileOut( __METHOD__ );
 886
 887                         return;
 888                 }
 889
 890                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 891                         $parserOptions->setEditSection( false );
 892                 }
 893
 894                 # Should the parser cache be used?
 895                 $useParserCache = $this->useParserCache( $oldid );
 896                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 897                 if ( $wgUser->getStubThreshold() ) {
 898                         wfIncrStats( 'pcache_miss_stub' );
 899                 }
 900
 901                 $wasRedirected = $this->showRedirectedFromHeader();
 902                 $this->showNamespaceHeader();
 903
 904                 # Iterate through the possible ways of constructing the output text.
 905                 # Keep going until $outputDone is set, or we run out of things to do.
 906                 $pass = 0;
 907                 $outputDone = false;
 908                 $this->mParserOutput = false;
 909
 910                 while ( !$outputDone && ++$pass ) {
 911                         switch( $pass ) {
 912                                 case 1:
 913                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 914                                         break;
 915                                 case 2:
 916                                         # Try the parser cache
 917                                         if ( $useParserCache ) {
 918                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 919
 920                                                 if ( $this->mParserOutput !== false ) {
 921                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 922                                                         $wgOut->addParserOutput( $this->mParserOutput );
 923                                                         # Ensure that UI elements requiring revision ID have
 924                                                         # the correct version information.
 925                                                         $wgOut->setRevisionId( $this->mLatest );
 926                                                         $outputDone = true;
 927                                                 }
 928                                         }
 929                                         break;
 930                                 case 3:
 931                                         $text = $this->getContent();
 932                                         if ( $text === false || $this->getID() == 0 ) {
 933                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 934                                                 $this->showMissingArticle();
 935                                                 wfProfileOut( __METHOD__ );
 936                                                 return;
 937                                         }
 938
 939                                         # Another whitelist check in case oldid is altering the title
 940                                         if ( !$this->mTitle->userCanRead() ) {
 941                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 942                                                 $wgOut->loginToUse();
 943                                                 $wgOut->output();
 944                                                 $wgOut->disable();
 945                                                 wfProfileOut( __METHOD__ );
 946                                                 return;
 947                                         }
 948
 949                                         # Are we looking at an old revision
 950                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 951                                                 $this->setOldSubtitle( $oldid );
 952
 953                                                 if ( !$this->showDeletedRevisionHeader() ) {
 954                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 955                                                         wfProfileOut( __METHOD__ );
 956                                                         return;
 957                                                 }
 958
 959                                                 # If this "old" version is the current, then try the parser cache...
 960                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 961                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 962                                                         if ( $this->mParserOutput ) {
 963                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 964                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 965                                                                 $wgOut->setRevisionId( $this->mLatest );
 966                                                                 $outputDone = true;
 967                                                                 break;
 968                                                         }
 969                                                 }
 970                                         }
 971
 972                                         # Ensure that UI elements requiring revision ID have
 973                                         # the correct version information.
 974                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 975
 976                                         # Pages containing custom CSS or JavaScript get special treatment
 977                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 978                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 979                                                 $this->showCssOrJsPage();
 980                                                 $outputDone = true;
 981                                         } else {
 982                                                 $rt = Title::newFromRedirectArray( $text );
 983                                                 if ( $rt ) {
 984                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 985                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 986                                                         # Don't append the subtitle if this was an old revision
 987                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 988                                                         # Parse just to get categories, displaytitle, etc.
 989                                                         $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 990                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 991                                                         $outputDone = true;
 992                                                 }
 993                                         }
 994                                         break;
 995                                 case 4:
 996                                         # Run the parse, protected by a pool counter
 997                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 998
 999                                         $key = $parserCache->getKey( $this, $parserOptions );
1000                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1001
1002                                         if ( !$poolArticleView->execute() ) {
1003                                                 # Connection or timeout error
1004                                                 wfProfileOut( __METHOD__ );
1005                                                 return;
1006                                         } else {
1007                                                 $outputDone = true;
1008                                         }
1009                                         break;
1010                                 # Should be unreachable, but just in case...
1011                                 default:
1012                                         break 2;
1013                         }
1014                 }
1015
1016                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1017                 if ( $this->mParserOutput ) {
1018                         $titleText = $this->mParserOutput->getTitleText();
1019
1020                         if ( strval( $titleText ) !== '' ) {
1021                                 $wgOut->setPageTitle( $titleText );
1022                         }
1023                 }
1024
1025                 # For the main page, overwrite the <title> element with the con-
1026                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1027                 # that's not empty).
1028                 # This message always exists because it is in the i18n files
1029                 if ( $this->mTitle->equals( Title::newMainPage() )
1030                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
1031                 {
1032                         $wgOut->setHTMLTitle( $m );
1033                 }
1034
1035                 # Now that we've filled $this->mParserOutput, we know whether
1036                 # there are any __NOINDEX__ tags on the page
1037                 $policy = $this->getRobotPolicy( 'view' );
1038                 $wgOut->setIndexPolicy( $policy['index'] );
1039                 $wgOut->setFollowPolicy( $policy['follow'] );
1040
1041                 $this->showViewFooter();
1042                 $this->viewUpdates();
1043                 wfProfileOut( __METHOD__ );
1044         }
1045
1046         /**
1047          * Show a diff page according to current request variables. For use within
1048          * Article::view() only, other callers should use the DifferenceEngine class.
1049          */
1050         public function showDiffPage() {
1051                 global $wgRequest, $wgUser;
1052
1053                 $diff = $wgRequest->getVal( 'diff' );
1054                 $rcid = $wgRequest->getVal( 'rcid' );
1055                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1056                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1057                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1058                 $oldid = $this->getOldID();
1059
1060                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1061                 // DifferenceEngine directly fetched the revision:
1062                 $this->mRevIdFetched = $de->mNewid;
1063                 $de->showDiffPage( $diffOnly );
1064
1065                 // Needed to get the page's current revision
1066                 $this->loadPageData();
1067                 if ( $diff == 0 || $diff == $this->mLatest ) {
1068                         # Run view updates for current revision only
1069                         $this->viewUpdates();
1070                 }
1071         }
1072
1073         /**
1074          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1075          * Article::view() only.
1076          *
1077          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1078          * page views.
1079          */
1080         protected function showCssOrJsPage() {
1081                 global $wgOut;
1082
1083                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1084
1085                 // Give hooks a chance to customise the output
1086                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1087                         // Wrap the whole lot in a <pre> and don't parse
1088                         $m = array();
1089                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1090                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1091                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1092                         $wgOut->addHTML( "\n</pre>\n" );
1093                 }
1094         }
1095
1096         /**
1097          * Get the robot policy to be used for the current view
1098          * @param $action String the action= GET parameter
1099          * @return Array the policy that should be set
1100          * TODO: actions other than 'view'
1101          */
1102         public function getRobotPolicy( $action ) {
1103                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1104                 global $wgDefaultRobotPolicy, $wgRequest;
1105
1106                 $ns = $this->mTitle->getNamespace();
1107
1108                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1109                         # Don't index user and user talk pages for blocked users (bug 11443)
1110                         if ( !$this->mTitle->isSubpage() ) {
1111                                 $block = new Block();
1112                                 if ( $block->load( $this->mTitle->getText() ) ) {
1113                                         return array(
1114                                                 'index'  => 'noindex',
1115                                                 'follow' => 'nofollow'
1116                                         );
1117                                 }
1118                         }
1119                 }
1120
1121                 if ( $this->getID() === 0 || $this->getOldID() ) {
1122                         # Non-articles (special pages etc), and old revisions
1123                         return array(
1124                                 'index'  => 'noindex',
1125                                 'follow' => 'nofollow'
1126                         );
1127                 } elseif ( $wgOut->isPrintable() ) {
1128                         # Discourage indexing of printable versions, but encourage following
1129                         return array(
1130                                 'index'  => 'noindex',
1131                                 'follow' => 'follow'
1132                         );
1133                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1134                         # For ?curid=x urls, disallow indexing
1135                         return array(
1136                                 'index'  => 'noindex',
1137                                 'follow' => 'follow'
1138                         );
1139                 }
1140
1141                 # Otherwise, construct the policy based on the various config variables.
1142                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1143
1144                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1145                         # Honour customised robot policies for this namespace
1146                         $policy = array_merge(
1147                                 $policy,
1148                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1149                         );
1150                 }
1151                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1152                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1153                         # a final sanity check that we have really got the parser output.
1154                         $policy = array_merge(
1155                                 $policy,
1156                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1157                         );
1158                 }
1159
1160                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1161                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1162                         $policy = array_merge(
1163                                 $policy,
1164                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1165                         );
1166                 }
1167
1168                 return $policy;
1169         }
1170
1171         /**
1172          * Converts a String robot policy into an associative array, to allow
1173          * merging of several policies using array_merge().
1174          * @param $policy Mixed, returns empty array on null/false/'', transparent
1175          *            to already-converted arrays, converts String.
1176          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1177          */
1178         public static function formatRobotPolicy( $policy ) {
1179                 if ( is_array( $policy ) ) {
1180                         return $policy;
1181                 } elseif ( !$policy ) {
1182                         return array();
1183                 }
1184
1185                 $policy = explode( ',', $policy );
1186                 $policy = array_map( 'trim', $policy );
1187
1188                 $arr = array();
1189                 foreach ( $policy as $var ) {
1190                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1191                                 $arr['index'] = $var;
1192                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1193                                 $arr['follow'] = $var;
1194                         }
1195                 }
1196
1197                 return $arr;
1198         }
1199
1200         /**
1201          * If this request is a redirect view, send "redirected from" subtitle to
1202          * $wgOut. Returns true if the header was needed, false if this is not a
1203          * redirect view. Handles both local and remote redirects.
1204          *
1205          * @return boolean
1206          */
1207         public function showRedirectedFromHeader() {
1208                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1209
1210                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1211                 $sk = $wgUser->getSkin();
1212
1213                 if ( isset( $this->mRedirectedFrom ) ) {
1214                         // This is an internally redirected page view.
1215                         // We'll need a backlink to the source page for navigation.
1216                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1217                                 $redir = $sk->link(
1218                                         $this->mRedirectedFrom,
1219                                         null,
1220                                         array(),
1221                                         array( 'redirect' => 'no' ),
1222                                         array( 'known', 'noclasses' )
1223                                 );
1224
1225                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1226                                 $wgOut->setSubtitle( $s );
1227
1228                                 // Set the fragment if one was specified in the redirect
1229                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1230                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1231                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1232                                 }
1233
1234                                 // Add a <link rel="canonical"> tag
1235                                 $wgOut->addLink( array( 'rel' => 'canonical',
1236                                         'href' => $this->mTitle->getLocalURL() )
1237                                 );
1238
1239                                 return true;
1240                         }
1241                 } elseif ( $rdfrom ) {
1242                         // This is an externally redirected view, from some other wiki.
1243                         // If it was reported from a trusted site, supply a backlink.
1244                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1245                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1246                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1247                                 $wgOut->setSubtitle( $s );
1248
1249                                 return true;
1250                         }
1251                 }
1252
1253                 return false;
1254         }
1255
1256         /**
1257          * Show a header specific to the namespace currently being viewed, like
1258          * [[MediaWiki:Talkpagetext]]. For Article::view().
1259          */
1260         public function showNamespaceHeader() {
1261                 global $wgOut;
1262
1263                 if ( $this->mTitle->isTalkPage() ) {
1264                         $msg = wfMsgNoTrans( 'talkpageheader' );
1265                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1266                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1267                         }
1268                 }
1269         }
1270
1271         /**
1272          * Show the footer section of an ordinary page view
1273          */
1274         public function showViewFooter() {
1275                 global $wgOut, $wgUseTrackbacks;
1276
1277                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1278                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1279                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1280                 }
1281
1282                 # If we have been passed an &rcid= parameter, we want to give the user a
1283                 # chance to mark this new article as patrolled.
1284                 $this->showPatrolFooter();
1285
1286                 # Trackbacks
1287                 if ( $wgUseTrackbacks ) {
1288                         $this->addTrackbacks();
1289                 }
1290         }
1291
1292         /**
1293          * If patrol is possible, output a patrol UI box. This is called from the
1294          * footer section of ordinary page views. If patrol is not possible or not
1295          * desired, does nothing.
1296          */
1297         public function showPatrolFooter() {
1298                 global $wgOut, $wgRequest, $wgUser;
1299
1300                 $rcid = $wgRequest->getVal( 'rcid' );
1301
1302                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1303                         return;
1304                 }
1305
1306                 $sk = $wgUser->getSkin();
1307                 $token = $wgUser->editToken( $rcid );
1308
1309                 $wgOut->addHTML(
1310                         "<div class='patrollink'>" .
1311                                 wfMsgHtml(
1312                                         'markaspatrolledlink',
1313                                         $sk->link(
1314                                                 $this->mTitle,
1315                                                 wfMsgHtml( 'markaspatrolledtext' ),
1316                                                 array(),
1317                                                 array(
1318                                                         'action' => 'markpatrolled',
1319                                                         'rcid' => $rcid,
1320                                                         'token' => $token,
1321                                                 ),
1322                                                 array( 'known', 'noclasses' )
1323                                         )
1324                                 ) .
1325                         '</div>'
1326                 );
1327         }
1328
1329         /**
1330          * Show the error text for a missing article. For articles in the MediaWiki
1331          * namespace, show the default message text. To be called from Article::view().
1332          */
1333         public function showMissingArticle() {
1334                 global $wgOut, $wgRequest, $wgUser;
1335
1336                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1337                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1338                         $parts = explode( '/', $this->mTitle->getText() );
1339                         $rootPart = $parts[0];
1340                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1341                         $ip = User::isIP( $rootPart );
1342
1343                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1344                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1345                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1346                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1347                                 LogEventsList::showLogExtract(
1348                                         $wgOut,
1349                                         'block',
1350                                         $user->getUserPage()->getPrefixedText(),
1351                                         '',
1352                                         array(
1353                                                 'lim' => 1,
1354                                                 'showIfEmpty' => false,
1355                                                 'msgKey' => array(
1356                                                         'blocked-notice-logextract',
1357                                                         $user->getName() # Support GENDER in notice
1358                                                 )
1359                                         )
1360                                 );
1361                         }
1362                 }
1363
1364                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1365
1366                 # Show delete and move logs
1367                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1368                         array(  'lim' => 10,
1369                                 'conds' => array( "log_action != 'revision'" ),
1370                                 'showIfEmpty' => false,
1371                                 'msgKey' => array( 'moveddeleted-notice' ) )
1372                 );
1373
1374                 # Show error message
1375                 $oldid = $this->getOldID();
1376                 if ( $oldid ) {
1377                         $text = wfMsgNoTrans( 'missing-article',
1378                                 $this->mTitle->getPrefixedText(),
1379                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1380                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1381                         // Use the default message text
1382                         $text = $this->getContent();
1383                 } else {
1384                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1385                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1386                         $errors = array_merge( $createErrors, $editErrors );
1387
1388                         if ( !count( $errors ) ) {
1389                                 $text = wfMsgNoTrans( 'noarticletext' );
1390                         } else {
1391                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1392                         }
1393                 }
1394                 $text = "<div class='noarticletext'>\n$text\n</div>";
1395
1396                 if ( !$this->hasViewableContent() ) {
1397                         // If there's no backing content, send a 404 Not Found
1398                         // for better machine handling of broken links.
1399                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1400                 }
1401
1402                 $wgOut->addWikiText( $text );
1403         }
1404
1405         /**
1406          * If the revision requested for view is deleted, check permissions.
1407          * Send either an error message or a warning header to $wgOut.
1408          *
1409          * @return boolean true if the view is allowed, false if not.
1410          */
1411         public function showDeletedRevisionHeader() {
1412                 global $wgOut, $wgRequest;
1413
1414                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1415                         // Not deleted
1416                         return true;
1417                 }
1418
1419                 // If the user is not allowed to see it...
1420                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1421                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1422                                 'rev-deleted-text-permission' );
1423
1424                         return false;
1425                 // If the user needs to confirm that they want to see it...
1426                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1427                         # Give explanation and add a link to view the revision...
1428                         $oldid = intval( $this->getOldID() );
1429                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1430                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1431                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1432                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1433                                 array( $msg, $link ) );
1434
1435                         return false;
1436                 // We are allowed to see...
1437                 } else {
1438                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1439                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1440                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1441
1442                         return true;
1443                 }
1444         }
1445
1446         /**
1447          * Should the parser cache be used?
1448          *
1449          * @return boolean
1450          */
1451         public function useParserCache( $oldid ) {
1452                 global $wgUser, $wgEnableParserCache;
1453
1454                 return $wgEnableParserCache
1455                         && $wgUser->getStubThreshold() == 0
1456                         && $this->exists()
1457                         && empty( $oldid )
1458                         && !$this->mTitle->isCssOrJsPage()
1459                         && !$this->mTitle->isCssJsSubpage();
1460         }
1461
1462         /**
1463          * Execute the uncached parse for action=view
1464          */
1465         public function doViewParse() {
1466                 global $wgOut;
1467
1468                 $oldid = $this->getOldID();
1469                 $parserOptions = $this->getParserOptions();
1470
1471                 # Render printable version, use printable version cache
1472                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1473
1474                 # Don't show section-edit links on old revisions... this way lies madness.
1475                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->mTitle->quickUserCan( 'edit' ) ) {
1476                         $parserOptions->setEditSection( false );
1477                 }
1478
1479                 $useParserCache = $this->useParserCache( $oldid );
1480                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1481
1482                 return true;
1483         }
1484
1485         /**
1486          * Try to fetch an expired entry from the parser cache. If it is present,
1487          * output it and return true. If it is not present, output nothing and
1488          * return false. This is used as a callback function for
1489          * PoolCounter::executeProtected().
1490          *
1491          * @return boolean
1492          */
1493         public function tryDirtyCache() {
1494                 global $wgOut;
1495                 $parserCache = ParserCache::singleton();
1496                 $options = $this->getParserOptions();
1497
1498                 if ( $wgOut->isPrintable() ) {
1499                         $options->setIsPrintable( true );
1500                         $options->setEditSection( false );
1501                 }
1502
1503                 $output = $parserCache->getDirty( $this, $options );
1504
1505                 if ( $output ) {
1506                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1507                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1508                         $wgOut->setSquidMaxage( 0 );
1509                         $this->mParserOutput = $output;
1510                         $wgOut->addParserOutput( $output );
1511                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1512
1513                         return true;
1514                 } else {
1515                         wfDebugLog( 'dirty', "dirty missing\n" );
1516                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1517
1518                         return false;
1519                 }
1520         }
1521
1522         /**
1523          * View redirect
1524          *
1525          * @param $target Title object or Array of destination(s) to redirect
1526          * @param $appendSubtitle Boolean [optional]
1527          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1528          * @return string containing HMTL with redirect link
1529          */
1530         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1531                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1532
1533                 if ( !is_array( $target ) ) {
1534                         $target = array( $target );
1535                 }
1536
1537                 $imageDir = $wgContLang->getDir();
1538
1539                 if ( $appendSubtitle ) {
1540                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1541                 }
1542
1543                 $sk = $wgUser->getSkin();
1544                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1545                 $title = array_shift( $target );
1546
1547                 if ( $forceKnown ) {
1548                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1549                 } else {
1550                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1551                 }
1552
1553                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1554                 $alt = $wgContLang->isRTL() ? '←' : '→';
1555                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1556                 // FIXME: where this happens?
1557                 foreach ( $target as $rt ) {
1558                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1559                         if ( $forceKnown ) {
1560                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText() ) );
1561                         } else {
1562                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1563                         }
1564                 }
1565
1566                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1567                 return '<div class="redirectMsg">' .
1568                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1569                         '<span class="redirectText">' . $link . '</span></div>';
1570         }
1571
1572         /**
1573          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1574          */
1575         public function addTrackbacks() {
1576                 global $wgOut, $wgUser;
1577
1578                 $dbr = wfGetDB( DB_SLAVE );
1579                 $tbs = $dbr->select( 'trackbacks',
1580                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1581                         array( 'tb_page' => $this->getID() )
1582                 );
1583
1584                 if ( !$dbr->numRows( $tbs ) ) {
1585                         return;
1586                 }
1587
1588                 $tbtext = "";
1589                 foreach ( $tbs as $o ) {
1590                         $rmvtxt = "";
1591
1592                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1593                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1594                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1595                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1596                         }
1597
1598                         $tbtext .= "\n";
1599                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1600                                         $o->tb_title,
1601                                         $o->tb_url,
1602                                         $o->tb_ex,
1603                                         $o->tb_name,
1604                                         $rmvtxt );
1605                 }
1606
1607                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1608         }
1609
1610         /**
1611          * Removes trackback record for current article from trackbacks table
1612          */
1613         public function deletetrackback() {
1614                 global $wgUser, $wgRequest, $wgOut;
1615
1616                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1617                         $wgOut->addWikiMsg( 'sessionfailure' );
1618
1619                         return;
1620                 }
1621
1622                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1623
1624                 if ( count( $permission_errors ) ) {
1625                         $wgOut->showPermissionsErrorPage( $permission_errors );
1626
1627                         return;
1628                 }
1629
1630                 $db = wfGetDB( DB_MASTER );
1631                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1632
1633                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1634                 $this->mTitle->invalidateCache();
1635         }
1636
1637         /**
1638          * Handle action=render
1639          */
1640
1641         public function render() {
1642                 global $wgOut;
1643
1644                 $wgOut->setArticleBodyOnly( true );
1645                 $this->view();
1646         }
1647
1648         /**
1649          * Handle action=purge
1650          */
1651         public function purge() {
1652                 global $wgUser, $wgRequest, $wgOut;
1653
1654                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1655                         //FIXME: shouldn't this be in doPurge()?
1656                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1657                                 $this->doPurge();
1658                                 $this->view();
1659                         }
1660                 } else {
1661                         $formParams = array(
1662                                 'method' => 'post',
1663                                 'action' =>  $wgRequest->getRequestURL(),
1664                         );
1665
1666                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1667
1668                         $form  = Html::openElement( 'form', $formParams );
1669                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1670                         $form .= Html::closeElement( 'form' );
1671
1672                         $wgOut->addHTML( $form );
1673                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1674
1675                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1676                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1677                 }
1678         }
1679
1680         /**
1681          * Perform the actions of a page purging
1682          */
1683         public function doPurge() {
1684                 global $wgUseSquid;
1685
1686                 // Invalidate the cache
1687                 $this->mTitle->invalidateCache();
1688                 $this->clear();
1689
1690                 if ( $wgUseSquid ) {
1691                         // Commit the transaction before the purge is sent
1692                         $dbw = wfGetDB( DB_MASTER );
1693                         $dbw->commit();
1694
1695                         // Send purge
1696                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1697                         $update->doUpdate();
1698                 }
1699
1700                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1701                         global $wgMessageCache;
1702
1703                         if ( $this->getID() == 0 ) {
1704                                 $text = false;
1705                         } else {
1706                                 $text = $this->getRawText();
1707                         }
1708
1709                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1710                 }
1711         }
1712
1713         /**
1714          * Insert a new empty page record for this article.
1715          * This *must* be followed up by creating a revision
1716          * and running $this->updateRevisionOn( ... );
1717          * or else the record will be left in a funky state.
1718          * Best if all done inside a transaction.
1719          *
1720          * @param $dbw Database
1721          * @return int The newly created page_id key, or false if the title already existed
1722          * @private
1723          */
1724         public function insertOn( $dbw ) {
1725                 wfProfileIn( __METHOD__ );
1726
1727                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1728                 $dbw->insert( 'page', array(
1729                         'page_id'           => $page_id,
1730                         'page_namespace'    => $this->mTitle->getNamespace(),
1731                         'page_title'        => $this->mTitle->getDBkey(),
1732                         'page_counter'      => 0,
1733                         'page_restrictions' => '',
1734                         'page_is_redirect'  => 0, # Will set this shortly...
1735                         'page_is_new'       => 1,
1736                         'page_random'       => wfRandom(),
1737                         'page_touched'      => $dbw->timestamp(),
1738                         'page_latest'       => 0, # Fill this in shortly...
1739                         'page_len'          => 0, # Fill this in shortly...
1740                 ), __METHOD__, 'IGNORE' );
1741
1742                 $affected = $dbw->affectedRows();
1743
1744                 if ( $affected ) {
1745                         $newid = $dbw->insertId();
1746                         $this->mTitle->resetArticleId( $newid );
1747                 }
1748                 wfProfileOut( __METHOD__ );
1749
1750                 return $affected ? $newid : false;
1751         }
1752
1753         /**
1754          * Update the page record to point to a newly saved revision.
1755          *
1756          * @param $dbw DatabaseBase: object
1757          * @param $revision Revision: For ID number, and text used to set
1758                             length and redirect status fields
1759          * @param $lastRevision Integer: if given, will not overwrite the page field
1760          *                      when different from the currently set value.
1761          *                      Giving 0 indicates the new page flag should be set
1762          *                      on.
1763          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1764          *                           removing rows in redirect table.
1765          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1766          *                    Needed when $lastRevision has to be set to sth. !=0
1767          * @return bool true on success, false on failure
1768          * @private
1769          */
1770         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1771                 wfProfileIn( __METHOD__ );
1772
1773                 $text = $revision->getText();
1774                 $rt = Title::newFromRedirectRecurse( $text );
1775
1776                 $conditions = array( 'page_id' => $this->getId() );
1777
1778                 if ( !is_null( $lastRevision ) ) {
1779                         # An extra check against threads stepping on each other
1780                         $conditions['page_latest'] = $lastRevision;
1781                 }
1782
1783                 if ( !$setNewFlag ) {
1784                         $setNewFlag = ( $lastRevision === 0 );
1785                 }
1786
1787                 $dbw->update( 'page',
1788                         array( /* SET */
1789                                 'page_latest'      => $revision->getId(),
1790                                 'page_touched'     => $dbw->timestamp(),
1791                                 'page_is_new'      => $setNewFlag,
1792                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1793                                 'page_len'         => strlen( $text ),
1794                         ),
1795                         $conditions,
1796                         __METHOD__ );
1797
1798                 $result = $dbw->affectedRows() != 0;
1799                 if ( $result ) {
1800                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1801                 }
1802
1803                 wfProfileOut( __METHOD__ );
1804                 return $result;
1805         }
1806
1807         /**
1808          * Add row to the redirect table if this is a redirect, remove otherwise.
1809          *
1810          * @param $dbw Database
1811          * @param $redirectTitle a title object pointing to the redirect target,
1812          *                       or NULL if this is not a redirect
1813          * @param $lastRevIsRedirect If given, will optimize adding and
1814          *                           removing rows in redirect table.
1815          * @return bool true on success, false on failure
1816          * @private
1817          */
1818         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1819                 // Always update redirects (target link might have changed)
1820                 // Update/Insert if we don't know if the last revision was a redirect or not
1821                 // Delete if changing from redirect to non-redirect
1822                 $isRedirect = !is_null( $redirectTitle );
1823
1824                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1825                         wfProfileIn( __METHOD__ );
1826                         if ( $isRedirect ) {
1827                                 $this->insertRedirectEntry( $redirectTitle );
1828                         } else {
1829                                 // This is not a redirect, remove row from redirect table
1830                                 $where = array( 'rd_from' => $this->getId() );
1831                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1832                         }
1833
1834                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1835                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1836                         }
1837                         wfProfileOut( __METHOD__ );
1838
1839                         return ( $dbw->affectedRows() != 0 );
1840                 }
1841
1842                 return true;
1843         }
1844
1845         /**
1846          * If the given revision is newer than the currently set page_latest,
1847          * update the page record. Otherwise, do nothing.
1848          *
1849          * @param $dbw Database object
1850          * @param $revision Revision object
1851          * @return mixed
1852          */
1853         public function updateIfNewerOn( &$dbw, $revision ) {
1854                 wfProfileIn( __METHOD__ );
1855
1856                 $row = $dbw->selectRow(
1857                         array( 'revision', 'page' ),
1858                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1859                         array(
1860                                 'page_id' => $this->getId(),
1861                                 'page_latest=rev_id' ),
1862                         __METHOD__ );
1863
1864                 if ( $row ) {
1865                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1866                                 wfProfileOut( __METHOD__ );
1867                                 return false;
1868                         }
1869                         $prev = $row->rev_id;
1870                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1871                 } else {
1872                         # No or missing previous revision; mark the page as new
1873                         $prev = 0;
1874                         $lastRevIsRedirect = null;
1875                 }
1876
1877                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1878
1879                 wfProfileOut( __METHOD__ );
1880                 return $ret;
1881         }
1882
1883         /**
1884          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1885          * @param $text String: new text of the section
1886          * @param $summary String: new section's subject, only if $section is 'new'
1887          * @param $edittime String: revision timestamp or null to use the current revision
1888          * @return string Complete article text, or null if error
1889          */
1890         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1891                 wfProfileIn( __METHOD__ );
1892
1893                 if ( strval( $section ) == '' ) {
1894                         // Whole-page edit; let the whole text through
1895                 } else {
1896                         if ( is_null( $edittime ) ) {
1897                                 $rev = Revision::newFromTitle( $this->mTitle );
1898                         } else {
1899                                 $dbw = wfGetDB( DB_MASTER );
1900                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1901                         }
1902
1903                         if ( !$rev ) {
1904                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1905                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1906                                 return null;
1907                         }
1908
1909                         $oldtext = $rev->getText();
1910
1911                         if ( $section == 'new' ) {
1912                                 # Inserting a new section
1913                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1914                                 $text = strlen( trim( $oldtext ) ) > 0
1915                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1916                                                 : "{$subject}{$text}";
1917                         } else {
1918                                 # Replacing an existing section; roll out the big guns
1919                                 global $wgParser;
1920
1921                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1922                         }
1923                 }
1924
1925                 wfProfileOut( __METHOD__ );
1926                 return $text;
1927         }
1928
1929         /**
1930          * This function is not deprecated until somebody fixes the core not to use
1931          * it. Nevertheless, use Article::doEdit() instead.
1932          */
1933         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1934                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1935                         ( $isminor ? EDIT_MINOR : 0 ) |
1936                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1937                         ( $bot ? EDIT_FORCE_BOT : 0 );
1938
1939                 # If this is a comment, add the summary as headline
1940                 if ( $comment && $summary != "" ) {
1941                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1942                 }
1943                 $this->doEdit( $text, $summary, $flags );
1944
1945                 $dbw = wfGetDB( DB_MASTER );
1946                 if ( $watchthis ) {
1947                         if ( !$this->mTitle->userIsWatching() ) {
1948                                 $dbw->begin();
1949                                 $this->doWatch();
1950                                 $dbw->commit();
1951                         }
1952                 } else {
1953                         if ( $this->mTitle->userIsWatching() ) {
1954                                 $dbw->begin();
1955                                 $this->doUnwatch();
1956                                 $dbw->commit();
1957                         }
1958                 }
1959                 $this->doRedirect( $this->isRedirect( $text ) );
1960         }
1961
1962         /**
1963          * @deprecated use Article::doEdit()
1964          */
1965         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1966                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1967                         ( $minor ? EDIT_MINOR : 0 ) |
1968                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1969
1970                 $status = $this->doEdit( $text, $summary, $flags );
1971
1972                 if ( !$status->isOK() ) {
1973                         return false;
1974                 }
1975
1976                 $dbw = wfGetDB( DB_MASTER );
1977                 if ( $watchthis ) {
1978                         if ( !$this->mTitle->userIsWatching() ) {
1979                                 $dbw->begin();
1980                                 $this->doWatch();
1981                                 $dbw->commit();
1982                         }
1983                 } else {
1984                         if ( $this->mTitle->userIsWatching() ) {
1985                                 $dbw->begin();
1986                                 $this->doUnwatch();
1987                                 $dbw->commit();
1988                         }
1989                 }
1990
1991                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1992                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1993
1994                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1995                 return true;
1996         }
1997
1998         /**
1999          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
2000          * @param $flags Int
2001          * @return Int updated $flags
2002          */
2003         function checkFlags( $flags ) {
2004                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
2005                         if ( $this->mTitle->getArticleID() ) {
2006                                 $flags |= EDIT_UPDATE;
2007                         } else {
2008                                 $flags |= EDIT_NEW;
2009                         }
2010                 }
2011
2012                 return $flags;
2013         }
2014
2015         /**
2016          * Article::doEdit()
2017          *
2018          * Change an existing article or create a new article. Updates RC and all necessary caches,
2019          * optionally via the deferred update array.
2020          *
2021          * $wgUser must be set before calling this function.
2022          *
2023          * @param $text String: new text
2024          * @param $summary String: edit summary
2025          * @param $flags Integer bitfield:
2026          *      EDIT_NEW
2027          *          Article is known or assumed to be non-existent, create a new one
2028          *      EDIT_UPDATE
2029          *          Article is known or assumed to be pre-existing, update it
2030          *      EDIT_MINOR
2031          *          Mark this edit minor, if the user is allowed to do so
2032          *      EDIT_SUPPRESS_RC
2033          *          Do not log the change in recentchanges
2034          *      EDIT_FORCE_BOT
2035          *          Mark the edit a "bot" edit regardless of user rights
2036          *      EDIT_DEFER_UPDATES
2037          *          Defer some of the updates until the end of index.php
2038          *      EDIT_AUTOSUMMARY
2039          *          Fill in blank summaries with generated text where possible
2040          *
2041          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2042          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2043          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2044          * edit-already-exists error will be returned. These two conditions are also possible with
2045          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2046          *
2047          * @param $baseRevId the revision ID this edit was based off, if any
2048          * @param $user Optional user object, $wgUser will be used if not passed
2049          *
2050          * @return Status object. Possible errors:
2051          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2052          *     edit-gone-missing:       In update mode, but the article didn't exist
2053          *     edit-conflict:           In update mode, the article changed unexpectedly
2054          *     edit-no-change:          Warning that the text was the same as before
2055          *     edit-already-exists:     In creation mode, but the article already exists
2056          *
2057          *  Extensions may define additional errors.
2058          *
2059          *  $return->value will contain an associative array with members as follows:
2060          *     new:                     Boolean indicating if the function attempted to create a new article
2061          *     revision:                The revision object for the inserted revision, or null
2062          *
2063          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2064          */
2065         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2066                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2067
2068                 # Low-level sanity check
2069                 if ( $this->mTitle->getText() === '' ) {
2070                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2071                 }
2072
2073                 wfProfileIn( __METHOD__ );
2074
2075                 $user = is_null( $user ) ? $wgUser : $user;
2076                 $status = Status::newGood( array() );
2077
2078                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2079                 $this->loadPageData();
2080
2081                 $flags = $this->checkFlags( $flags );
2082
2083                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2084                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2085                 {
2086                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2087                         wfProfileOut( __METHOD__ );
2088
2089                         if ( $status->isOK() ) {
2090                                 $status->fatal( 'edit-hook-aborted' );
2091                         }
2092
2093                         return $status;
2094                 }
2095
2096                 # Silently ignore EDIT_MINOR if not allowed
2097                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2098                 $bot = $flags & EDIT_FORCE_BOT;
2099
2100                 $oldtext = $this->getRawText(); // current revision
2101                 $oldsize = strlen( $oldtext );
2102
2103                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2104                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2105                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2106                 }
2107
2108                 $editInfo = $this->prepareTextForEdit( $text );
2109                 $text = $editInfo->pst;
2110                 $newsize = strlen( $text );
2111
2112                 $dbw = wfGetDB( DB_MASTER );
2113                 $now = wfTimestampNow();
2114                 $this->mTimestamp = $now;
2115
2116                 if ( $flags & EDIT_UPDATE ) {
2117                         # Update article, but only if changed.
2118                         $status->value['new'] = false;
2119
2120                         # Make sure the revision is either completely inserted or not inserted at all
2121                         if ( !$wgDBtransactions ) {
2122                                 $userAbort = ignore_user_abort( true );
2123                         }
2124
2125                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2126
2127                         if ( $changed ) {
2128                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2129                                   - (int)$this->isCountable( $oldtext );
2130                                 $this->mTotalAdjustment = 0;
2131
2132                                 if ( !$this->mLatest ) {
2133                                         # Article gone missing
2134                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2135                                         $status->fatal( 'edit-gone-missing' );
2136
2137                                         wfProfileOut( __METHOD__ );
2138                                         return $status;
2139                                 }
2140
2141                                 $revision = new Revision( array(
2142                                         'page'       => $this->getId(),
2143                                         'comment'    => $summary,
2144                                         'minor_edit' => $isminor,
2145                                         'text'       => $text,
2146                                         'parent_id'  => $this->mLatest,
2147                                         'user'       => $user->getId(),
2148                                         'user_text'  => $user->getName(),
2149                                         'timestamp'  => $now
2150                                 ) );
2151
2152                                 $dbw->begin();
2153                                 $revisionId = $revision->insertOn( $dbw );
2154
2155                                 # Update page
2156                                 #
2157                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2158                                 # during the course of this function. This makes sure that EditPage can detect
2159                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2160                                 # before this function is called. A previous function used a separate query, this
2161                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2162                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2163
2164                                 if ( !$ok ) {
2165                                         /* Belated edit conflict! Run away!! */
2166                                         $status->fatal( 'edit-conflict' );
2167
2168                                         # Delete the invalid revision if the DB is not transactional
2169                                         if ( !$wgDBtransactions ) {
2170                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2171                                         }
2172
2173                                         $revisionId = 0;
2174                                         $dbw->rollback();
2175                                 } else {
2176                                         global $wgUseRCPatrol;
2177                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2178                                         # Update recentchanges
2179                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2180                                                 # Mark as patrolled if the user can do so
2181                                                 $patrolled = $wgUseRCPatrol && !count(
2182                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2183                                                 # Add RC row to the DB
2184                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2185                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2186                                                         $revisionId, $patrolled
2187                                                 );
2188
2189                                                 # Log auto-patrolled edits
2190                                                 if ( $patrolled ) {
2191                                                         PatrolLog::record( $rc, true );
2192                                                 }
2193                                         }
2194                                         $user->incEditCount();
2195                                         $dbw->commit();
2196                                 }
2197                         } else {
2198                                 $status->warning( 'edit-no-change' );
2199                                 $revision = null;
2200                                 // Keep the same revision ID, but do some updates on it
2201                                 $revisionId = $this->getRevIdFetched();
2202                                 // Update page_touched, this is usually implicit in the page update
2203                                 // Other cache updates are done in onArticleEdit()
2204                                 $this->mTitle->invalidateCache();
2205                         }
2206
2207                         if ( !$wgDBtransactions ) {
2208                                 ignore_user_abort( $userAbort );
2209                         }
2210
2211                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2212                         if ( !$status->isOK() ) {
2213                                 wfProfileOut( __METHOD__ );
2214                                 return $status;
2215                         }
2216
2217                         # Invalidate cache of this article and all pages using this article
2218                         # as a template. Partly deferred.
2219                         Article::onArticleEdit( $this->mTitle );
2220                         # Update links tables, site stats, etc.
2221                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2222                 } else {
2223                         # Create new article
2224                         $status->value['new'] = true;
2225
2226                         # Set statistics members
2227                         # We work out if it's countable after PST to avoid counter drift
2228                         # when articles are created with {{subst:}}
2229                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2230                         $this->mTotalAdjustment = 1;
2231
2232                         $dbw->begin();
2233
2234                         # Add the page record; stake our claim on this title!
2235                         # This will return false if the article already exists
2236                         $newid = $this->insertOn( $dbw );
2237
2238                         if ( $newid === false ) {
2239                                 $dbw->rollback();
2240                                 $status->fatal( 'edit-already-exists' );
2241
2242                                 wfProfileOut( __METHOD__ );
2243                                 return $status;
2244                         }
2245
2246                         # Save the revision text...
2247                         $revision = new Revision( array(
2248                                 'page'       => $newid,
2249                                 'comment'    => $summary,
2250                                 'minor_edit' => $isminor,
2251                                 'text'       => $text,
2252                                 'user'       => $user->getId(),
2253                                 'user_text'  => $user->getName(),
2254                                 'timestamp'  => $now
2255                         ) );
2256                         $revisionId = $revision->insertOn( $dbw );
2257
2258                         $this->mTitle->resetArticleID( $newid );
2259
2260                         # Update the page record with revision data
2261                         $this->updateRevisionOn( $dbw, $revision, 0 );
2262
2263                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2264
2265                         # Update recentchanges
2266                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2267                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2268
2269                                 # Mark as patrolled if the user can do so
2270                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
2271                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2272                                 # Add RC row to the DB
2273                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2274                                         '', strlen( $text ), $revisionId, $patrolled );
2275
2276                                 # Log auto-patrolled edits
2277                                 if ( $patrolled ) {
2278                                         PatrolLog::record( $rc, true );
2279                                 }
2280                         }
2281                         $user->incEditCount();
2282                         $dbw->commit();
2283
2284                         # Update links, etc.
2285                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2286
2287                         # Clear caches
2288                         Article::onArticleCreate( $this->mTitle );
2289
2290                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2291                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2292                 }
2293
2294                 # Do updates right now unless deferral was requested
2295                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2296                         wfDoUpdates();
2297                 }
2298
2299                 // Return the new revision (or null) to the caller
2300                 $status->value['revision'] = $revision;
2301
2302                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2303                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2304
2305                 wfProfileOut( __METHOD__ );
2306                 return $status;
2307         }
2308
2309         /**
2310          * @deprecated wrapper for doRedirect
2311          */
2312         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2313                 wfDeprecated( __METHOD__ );
2314                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2315         }
2316
2317         /**
2318          * Output a redirect back to the article.
2319          * This is typically used after an edit.
2320          *
2321          * @param $noRedir Boolean: add redirect=no
2322          * @param $sectionAnchor String: section to redirect to, including "#"
2323          * @param $extraQuery String: extra query params
2324          */
2325         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2326                 global $wgOut;
2327
2328                 if ( $noRedir ) {
2329                         $query = 'redirect=no';
2330                         if ( $extraQuery )
2331                                 $query .= "&$extraQuery";
2332                 } else {
2333                         $query = $extraQuery;
2334                 }
2335
2336                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2337         }
2338
2339         /**
2340          * Mark this particular edit/page as patrolled
2341          */
2342         public function markpatrolled() {
2343                 global $wgOut, $wgUser, $wgRequest;
2344
2345                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2346
2347                 # If we haven't been given an rc_id value, we can't do anything
2348                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2349
2350                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $rcid ) ) {
2351                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2352                         return;
2353                 }
2354
2355                 $rc = RecentChange::newFromId( $rcid );
2356
2357                 if ( is_null( $rc ) ) {
2358                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2359                         return;
2360                 }
2361
2362                 # It would be nice to see where the user had actually come from, but for now just guess
2363                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2364                 $return = SpecialPage::getTitleFor( $returnto );
2365
2366                 $errors = $rc->doMarkPatrolled();
2367
2368                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2369                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2370
2371                         return;
2372                 }
2373
2374                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2375                         // The hook itself has handled any output
2376                         return;
2377                 }
2378
2379                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2380                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2381                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2382                         $wgOut->returnToMain( false, $return );
2383
2384                         return;
2385                 }
2386
2387                 if ( !empty( $errors ) ) {
2388                         $wgOut->showPermissionsErrorPage( $errors );
2389
2390                         return;
2391                 }
2392
2393                 # Inform the user
2394                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2395                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2396                 $wgOut->returnToMain( false, $return );
2397         }
2398
2399         /**
2400          * User-interface handler for the "watch" action
2401          */
2402         public function watch() {
2403                 global $wgUser, $wgOut;
2404
2405                 if ( $wgUser->isAnon() ) {
2406                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2407                         return;
2408                 }
2409
2410                 if ( wfReadOnly() ) {
2411                         $wgOut->readOnlyPage();
2412                         return;
2413                 }
2414
2415                 if ( $this->doWatch() ) {
2416                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2417                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2418                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2419                 }
2420
2421                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2422         }
2423
2424         /**
2425          * Add this page to $wgUser's watchlist
2426          * @return bool true on successful watch operation
2427          */
2428         public function doWatch() {
2429                 global $wgUser;
2430
2431                 if ( $wgUser->isAnon() ) {
2432                         return false;
2433                 }
2434
2435                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2436                         $wgUser->addWatch( $this->mTitle );
2437                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2438                 }
2439
2440                 return false;
2441         }
2442
2443         /**
2444          * User interface handler for the "unwatch" action.
2445          */
2446         public function unwatch() {
2447                 global $wgUser, $wgOut;
2448
2449                 if ( $wgUser->isAnon() ) {
2450                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2451                         return;
2452                 }
2453
2454                 if ( wfReadOnly() ) {
2455                         $wgOut->readOnlyPage();
2456                         return;
2457                 }
2458
2459                 if ( $this->doUnwatch() ) {
2460                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2461                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2462                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2463                 }
2464
2465                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2466         }
2467
2468         /**
2469          * Stop watching a page
2470          * @return bool true on successful unwatch
2471          */
2472         public function doUnwatch() {
2473                 global $wgUser;
2474
2475                 if ( $wgUser->isAnon() ) {
2476                         return false;
2477                 }
2478
2479                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2480                         $wgUser->removeWatch( $this->mTitle );
2481                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2482                 }
2483
2484                 return false;
2485         }
2486
2487         /**
2488          * action=protect handler
2489          */
2490         public function protect() {
2491                 $form = new ProtectionForm( $this );
2492                 $form->execute();
2493         }
2494
2495         /**
2496          * action=unprotect handler (alias)
2497          */
2498         public function unprotect() {
2499                 $this->protect();
2500         }
2501
2502         /**
2503          * Update the article's restriction field, and leave a log entry.
2504          *
2505          * @param $limit Array: set of restriction keys
2506          * @param $reason String
2507          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2508          * @param $expiry Array: per restriction type expiration
2509          * @return bool true on success
2510          */
2511         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2512                 global $wgUser, $wgContLang;
2513
2514                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2515
2516                 $id = $this->mTitle->getArticleID();
2517
2518                 if ( $id <= 0 ) {
2519                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
2520                         return false;
2521                 }
2522
2523                 if ( wfReadOnly() ) {
2524                         wfDebug( "updateRestrictions failed: read-only\n" );
2525                         return false;
2526                 }
2527
2528                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2529                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2530                         return false;
2531                 }
2532
2533                 if ( !$cascade ) {
2534                         $cascade = false;
2535                 }
2536
2537                 // Take this opportunity to purge out expired restrictions
2538                 Title::purgeExpiredRestrictions();
2539
2540                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2541                 # we expect a single selection, but the schema allows otherwise.
2542                 $current = array();
2543                 $updated = Article::flattenRestrictions( $limit );
2544                 $changed = false;
2545
2546                 foreach ( $restrictionTypes as $action ) {
2547                         if ( isset( $expiry[$action] ) ) {
2548                                 # Get current restrictions on $action
2549                                 $aLimits = $this->mTitle->getRestrictions( $action );
2550                                 $current[$action] = implode( '', $aLimits );
2551                                 # Are any actual restrictions being dealt with here?
2552                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2553
2554                                 # If something changed, we need to log it. Checking $aRChanged
2555                                 # assures that "unprotecting" a page that is not protected does
2556                                 # not log just because the expiry was "changed".
2557                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2558                                         $changed = true;
2559                                 }
2560                         }
2561                 }
2562
2563                 $current = Article::flattenRestrictions( $current );
2564
2565                 $changed = ( $changed || $current != $updated );
2566                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2567                 $protect = ( $updated != '' );
2568
2569                 # If nothing's changed, do nothing
2570                 if ( $changed ) {
2571                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2572                                 $dbw = wfGetDB( DB_MASTER );
2573
2574                                 # Prepare a null revision to be added to the history
2575                                 $modified = $current != '' && $protect;
2576
2577                                 if ( $protect ) {
2578                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2579                                 } else {
2580                                         $comment_type = 'unprotectedarticle';
2581                                 }
2582
2583                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2584
2585                                 # Only restrictions with the 'protect' right can cascade...
2586                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2587                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2588
2589                                 # The schema allows multiple restrictions
2590                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2591                                         $cascade = false;
2592                                 }
2593
2594                                 $cascade_description = '';
2595
2596                                 if ( $cascade ) {
2597                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2598                                 }
2599
2600                                 if ( $reason ) {
2601                                         $comment .= ": $reason";
2602                                 }
2603
2604                                 $editComment = $comment;
2605                                 $encodedExpiry = array();
2606                                 $protect_description = '';
2607                                 foreach ( $limit as $action => $restrictions ) {
2608                                         if ( !isset( $expiry[$action] ) )
2609                                                 $expiry[$action] = Block::infinity();
2610
2611                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2612                                         if ( $restrictions != '' ) {
2613                                                 $protect_description .= "[$action=$restrictions] (";
2614                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2615                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2616                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2617                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2618                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2619                                                 } else {
2620                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2621                                                 }
2622
2623                                                 $protect_description .= ') ';
2624                                         }
2625                                 }
2626                                 $protect_description = trim( $protect_description );
2627
2628                                 if ( $protect_description && $protect ) {
2629                                         $editComment .= " ($protect_description)";
2630                                 }
2631
2632                                 if ( $cascade ) {
2633                                         $editComment .= "$cascade_description";
2634                                 }
2635
2636                                 # Update restrictions table
2637                                 foreach ( $limit as $action => $restrictions ) {
2638                                         if ( $restrictions != '' ) {
2639                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2640                                                         array( 'pr_page' => $id,
2641                                                                 'pr_type' => $action,
2642                                                                 'pr_level' => $restrictions,
2643                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2644                                                                 'pr_expiry' => $encodedExpiry[$action]
2645                                                         ),
2646                                                         __METHOD__
2647                                                 );
2648                                         } else {
2649                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2650                                                         'pr_type' => $action ), __METHOD__ );
2651                                         }
2652                                 }
2653
2654                                 # Insert a null revision
2655                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2656                                 $nullRevId = $nullRevision->insertOn( $dbw );
2657
2658                                 $latest = $this->getLatest();
2659                                 # Update page record
2660                                 $dbw->update( 'page',
2661                                         array( /* SET */
2662                                                 'page_touched' => $dbw->timestamp(),
2663                                                 'page_restrictions' => '',
2664                                                 'page_latest' => $nullRevId
2665                                         ), array( /* WHERE */
2666                                                 'page_id' => $id
2667                                         ), 'Article::protect'
2668                                 );
2669
2670                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2671                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2672
2673                                 # Update the protection log
2674                                 $log = new LogPage( 'protect' );
2675                                 if ( $protect ) {
2676                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2677                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2678                                 } else {
2679                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2680                                 }
2681                         } # End hook
2682                 } # End "changed" check
2683
2684                 return true;
2685         }
2686
2687         /**
2688          * Take an array of page restrictions and flatten it to a string
2689          * suitable for insertion into the page_restrictions field.
2690          * @param $limit Array
2691          * @return String
2692          */
2693         protected static function flattenRestrictions( $limit ) {
2694                 if ( !is_array( $limit ) ) {
2695                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2696                 }
2697
2698                 $bits = array();
2699                 ksort( $limit );
2700
2701                 foreach ( $limit as $action => $restrictions ) {
2702                         if ( $restrictions != '' ) {
2703                                 $bits[] = "$action=$restrictions";
2704                         }
2705                 }
2706
2707                 return implode( ':', $bits );
2708         }
2709
2710         /**
2711          * Auto-generates a deletion reason
2712          *
2713          * @param &$hasHistory Boolean: whether the page has a history
2714          * @return mixed String containing deletion reason or empty string, or boolean false
2715          *    if no revision occurred
2716          */
2717         public function generateReason( &$hasHistory ) {
2718                 global $wgContLang;
2719
2720                 $dbw = wfGetDB( DB_MASTER );
2721                 // Get the last revision
2722                 $rev = Revision::newFromTitle( $this->mTitle );
2723
2724                 if ( is_null( $rev ) ) {
2725                         return false;
2726                 }
2727
2728                 // Get the article's contents
2729                 $contents = $rev->getText();
2730                 $blank = false;
2731
2732                 // If the page is blank, use the text from the previous revision,
2733                 // which can only be blank if there's a move/import/protect dummy revision involved
2734                 if ( $contents == '' ) {
2735                         $prev = $rev->getPrevious();
2736
2737                         if ( $prev )    {
2738                                 $contents = $prev->getText();
2739                                 $blank = true;
2740                         }
2741                 }
2742
2743                 // Find out if there was only one contributor
2744                 // Only scan the last 20 revisions
2745                 $res = $dbw->select( 'revision', 'rev_user_text',
2746                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2747                         __METHOD__,
2748                         array( 'LIMIT' => 20 )
2749                 );
2750
2751                 if ( $res === false ) {
2752                         // This page has no revisions, which is very weird
2753                         return false;
2754                 }
2755
2756                 $hasHistory = ( $res->numRows() > 1 );
2757                 $row = $dbw->fetchObject( $res );
2758
2759                 if ( $row ) { // $row is false if the only contributor is hidden
2760                         $onlyAuthor = $row->rev_user_text;
2761                         // Try to find a second contributor
2762                         foreach ( $res as $row ) {
2763                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2764                                         $onlyAuthor = false;
2765                                         break;
2766                                 }
2767                         }
2768                 } else {
2769                         $onlyAuthor = false;
2770                 }
2771
2772                 // Generate the summary with a '$1' placeholder
2773                 if ( $blank ) {
2774                         // The current revision is blank and the one before is also
2775                         // blank. It's just not our lucky day
2776                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2777                 } else {
2778                         if ( $onlyAuthor ) {
2779                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2780                         } else {
2781                                 $reason = wfMsgForContent( 'excontent', '$1' );
2782                         }
2783                 }
2784
2785                 if ( $reason == '-' ) {
2786                         // Allow these UI messages to be blanked out cleanly
2787                         return '';
2788                 }
2789
2790                 // Replace newlines with spaces to prevent uglyness
2791                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2792                 // Calculate the maximum amount of chars to get
2793                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2794                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2795                 $contents = $wgContLang->truncate( $contents, $maxLength );
2796                 // Remove possible unfinished links
2797                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2798                 // Now replace the '$1' placeholder
2799                 $reason = str_replace( '$1', $contents, $reason );
2800
2801                 return $reason;
2802         }
2803
2804
2805         /*
2806          * UI entry point for page deletion
2807          */
2808         public function delete() {
2809                 global $wgUser, $wgOut, $wgRequest;
2810
2811                 $confirm = $wgRequest->wasPosted() &&
2812                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2813
2814                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2815                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2816
2817                 $reason = $this->DeleteReasonList;
2818
2819                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2820                         // Entry from drop down menu + additional comment
2821                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2822                 } elseif ( $reason == 'other' ) {
2823                         $reason = $this->DeleteReason;
2824                 }
2825
2826                 # Flag to hide all contents of the archived revisions
2827                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2828
2829                 # This code desperately needs to be totally rewritten
2830
2831                 # Read-only check...
2832                 if ( wfReadOnly() ) {
2833                         $wgOut->readOnlyPage();
2834
2835                         return;
2836                 }
2837
2838                 # Check permissions
2839                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2840
2841                 if ( count( $permission_errors ) > 0 ) {
2842                         $wgOut->showPermissionsErrorPage( $permission_errors );
2843
2844                         return;
2845                 }
2846
2847                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2848
2849                 # Better double-check that it hasn't been deleted yet!
2850                 $dbw = wfGetDB( DB_MASTER );
2851                 $conds = $this->mTitle->pageCond();
2852                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2853                 if ( $latest === false ) {
2854                         $wgOut->showFatalError(
2855                                 Html::rawElement(
2856                                         'div',
2857                                         array( 'class' => 'error mw-error-cannotdelete' ),
2858                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2859                                 )
2860                         );
2861                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2862                         LogEventsList::showLogExtract(
2863                                 $wgOut,
2864                                 'delete',
2865                                 $this->mTitle->getPrefixedText()
2866                         );
2867
2868                         return;
2869                 }
2870
2871                 # Hack for big sites
2872                 $bigHistory = $this->isBigDeletion();
2873                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2874                         global $wgLang, $wgDeleteRevisionsLimit;
2875
2876                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2877                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2878
2879                         return;
2880                 }
2881
2882                 if ( $confirm ) {
2883                         $this->doDelete( $reason, $suppress );
2884
2885                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2886                                 $this->doWatch();
2887                         } elseif ( $this->mTitle->userIsWatching() ) {
2888                                 $this->doUnwatch();
2889                         }
2890
2891                         return;
2892                 }
2893
2894                 // Generate deletion reason
2895                 $hasHistory = false;
2896                 if ( !$reason ) {
2897                         $reason = $this->generateReason( $hasHistory );
2898                 }
2899
2900                 // If the page has a history, insert a warning
2901                 if ( $hasHistory && !$confirm ) {
2902                         global $wgLang;
2903
2904                         $skin = $wgUser->getSkin();
2905                         $revisions = $this->estimateRevisionCount();
2906                         //FIXME: lego
2907                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2908                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2909                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2910                                 '</strong>'
2911                         );
2912
2913                         if ( $bigHistory ) {
2914                                 global $wgDeleteRevisionsLimit;
2915                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2916                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2917                         }
2918                 }
2919
2920                 return $this->confirmDelete( $reason );
2921         }
2922
2923         /**
2924          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2925          */
2926         public function isBigDeletion() {
2927                 global $wgDeleteRevisionsLimit;
2928
2929                 if ( $wgDeleteRevisionsLimit ) {
2930                         $revCount = $this->estimateRevisionCount();
2931
2932                         return $revCount > $wgDeleteRevisionsLimit;
2933                 }
2934
2935                 return false;
2936         }
2937
2938         /**
2939          * @return int approximate revision count
2940          */
2941         public function estimateRevisionCount() {
2942                 $dbr = wfGetDB( DB_SLAVE );
2943
2944                 // For an exact count...
2945                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2946                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2947                 return $dbr->estimateRowCount( 'revision', '*',
2948                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2949         }
2950
2951         /**
2952          * Get the last N authors
2953          * @param $num Integer: number of revisions to get
2954          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2955          * @return array Array of authors, duplicates not removed
2956          */
2957         public function getLastNAuthors( $num, $revLatest = 0 ) {
2958                 wfProfileIn( __METHOD__ );
2959                 // First try the slave
2960                 // If that doesn't have the latest revision, try the master
2961                 $continue = 2;
2962                 $db = wfGetDB( DB_SLAVE );
2963
2964                 do {
2965                         $res = $db->select( array( 'page', 'revision' ),
2966                                 array( 'rev_id', 'rev_user_text' ),
2967                                 array(
2968                                         'page_namespace' => $this->mTitle->getNamespace(),
2969                                         'page_title' => $this->mTitle->getDBkey(),
2970                                         'rev_page = page_id'
2971                                 ), __METHOD__, $this->getSelectOptions( array(
2972                                         'ORDER BY' => 'rev_timestamp DESC',
2973                                         'LIMIT' => $num
2974                                 ) )
2975                         );
2976
2977                         if ( !$res ) {
2978                                 wfProfileOut( __METHOD__ );
2979                                 return array();
2980                         }
2981
2982                         $row = $db->fetchObject( $res );
2983
2984                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2985                                 $db = wfGetDB( DB_MASTER );
2986                                 $continue--;
2987                         } else {
2988                                 $continue = 0;
2989                         }
2990                 } while ( $continue );
2991
2992                 $authors = array( $row->rev_user_text );
2993
2994                 foreach ( $res as $row ) {
2995                         $authors[] = $row->rev_user_text;
2996                 }
2997
2998                 wfProfileOut( __METHOD__ );
2999                 return $authors;
3000         }
3001
3002         /**
3003          * Output deletion confirmation dialog
3004          * FIXME: Move to another file?
3005          * @param $reason String: prefilled reason
3006          */
3007         public function confirmDelete( $reason ) {
3008                 global $wgOut, $wgUser;
3009
3010                 wfDebug( "Article::confirmDelete\n" );
3011
3012                 $deleteBackLink = $wgUser->getSkin()->linkKnown( $this->mTitle );
3013                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
3014                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3015                 $wgOut->addWikiMsg( 'confirmdeletetext' );
3016
3017                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
3018
3019                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
3020                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
3021                                         <td></td>
3022                                         <td class='mw-input'><strong>" .
3023                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
3024                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
3025                                         "</strong></td>
3026                                 </tr>";
3027                 } else {
3028                         $suppress = '';
3029                 }
3030                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3031
3032                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3033                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3034                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3035                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3036                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3037                         "<tr id=\"wpDeleteReasonListRow\">
3038                                 <td class='mw-label'>" .
3039                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3040                                 "</td>
3041                                 <td class='mw-input'>" .
3042                                         Xml::listDropDown( 'wpDeleteReasonList',
3043                                                 wfMsgForContent( 'deletereason-dropdown' ),
3044                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3045                                 "</td>
3046                         </tr>
3047                         <tr id=\"wpDeleteReasonRow\">
3048                                 <td class='mw-label'>" .
3049                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3050                                 "</td>
3051                                 <td class='mw-input'>" .
3052                                 Html::input( 'wpReason', $reason, 'text', array(
3053                                         'size' => '60',
3054                                         'maxlength' => '255',
3055                                         'tabindex' => '2',
3056                                         'id' => 'wpReason',
3057                                         'autofocus'
3058                                 ) ) .
3059                                 "</td>
3060                         </tr>";
3061
3062                 # Disallow watching if user is not logged in
3063                 if ( $wgUser->isLoggedIn() ) {
3064                         $form .= "
3065                         <tr>
3066                                 <td></td>
3067                                 <td class='mw-input'>" .
3068                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3069                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3070                                 "</td>
3071                         </tr>";
3072                 }
3073
3074                 $form .= "
3075                         $suppress
3076                         <tr>
3077                                 <td></td>
3078                                 <td class='mw-submit'>" .
3079                                         Xml::submitButton( wfMsg( 'deletepage' ),
3080                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3081                                 "</td>
3082                         </tr>" .
3083                         Xml::closeElement( 'table' ) .
3084                         Xml::closeElement( 'fieldset' ) .
3085                         Html::hidden( 'wpEditToken', $wgUser->editToken() ) .
3086                         Xml::closeElement( 'form' );
3087
3088                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
3089                                 $skin = $wgUser->getSkin();
3090                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3091                                 $link = $skin->link(
3092                                         $title,
3093                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3094                                         array(),
3095                                         array( 'action' => 'edit' )
3096                                 );
3097                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3098                         }
3099
3100                 $wgOut->addHTML( $form );
3101                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3102                 LogEventsList::showLogExtract( $wgOut, 'delete',
3103                         $this->mTitle->getPrefixedText()
3104                 );
3105         }
3106
3107         /**
3108          * Perform a deletion and output success or failure messages
3109          */
3110         public function doDelete( $reason, $suppress = false ) {
3111                 global $wgOut, $wgUser;
3112
3113                 $id = $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3114
3115                 $error = '';
3116                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3117                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
3118                                 $deleted = $this->mTitle->getPrefixedText();
3119
3120                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3121                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3122
3123                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3124
3125                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3126                                 $wgOut->returnToMain( false );
3127                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3128                         }
3129                 } else {
3130                         if ( $error == '' ) {
3131                                 $wgOut->showFatalError(
3132                                         Html::rawElement(
3133                                                 'div',
3134                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3135                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3136                                         )
3137                                 );
3138
3139                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3140
3141                                 LogEventsList::showLogExtract(
3142                                         $wgOut,
3143                                         'delete',
3144                                         $this->mTitle->getPrefixedText()
3145                                 );
3146                         } else {
3147                                 $wgOut->showFatalError( $error );
3148                         }
3149                 }
3150         }
3151
3152         /**
3153          * Back-end article deletion
3154          * Deletes the article with database consistency, writes logs, purges caches
3155          *
3156          * @param $reason string delete reason for deletion log
3157          * @param suppress bitfield
3158          *      Revision::DELETED_TEXT
3159          *      Revision::DELETED_COMMENT
3160          *      Revision::DELETED_USER
3161          *      Revision::DELETED_RESTRICTED
3162          * @param $id int article ID
3163          * @param $commit boolean defaults to true, triggers transaction end
3164          * @return boolean true if successful
3165          */
3166         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
3167                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3168
3169                 wfDebug( __METHOD__ . "\n" );
3170
3171                 $dbw = wfGetDB( DB_MASTER );
3172                 $t = $this->mTitle->getDBkey();
3173                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3174
3175                 if ( $t === '' || $id == 0 ) {
3176                         return false;
3177                 }
3178
3179                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3180                 array_push( $wgDeferredUpdateList, $u );
3181
3182                 // Bitfields to further suppress the content
3183                 if ( $suppress ) {
3184                         $bitfield = 0;
3185                         // This should be 15...
3186                         $bitfield |= Revision::DELETED_TEXT;
3187                         $bitfield |= Revision::DELETED_COMMENT;
3188                         $bitfield |= Revision::DELETED_USER;
3189                         $bitfield |= Revision::DELETED_RESTRICTED;
3190                 } else {
3191                         $bitfield = 'rev_deleted';
3192                 }
3193
3194                 $dbw->begin();
3195                 // For now, shunt the revision data into the archive table.
3196                 // Text is *not* removed from the text table; bulk storage
3197                 // is left intact to avoid breaking block-compression or
3198                 // immutable storage schemes.
3199                 //
3200                 // For backwards compatibility, note that some older archive
3201                 // table entries will have ar_text and ar_flags fields still.
3202                 //
3203                 // In the future, we may keep revisions and mark them with
3204                 // the rev_deleted field, which is reserved for this purpose.
3205                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3206                         array(
3207                                 'ar_namespace'  => 'page_namespace',
3208                                 'ar_title'      => 'page_title',
3209                                 'ar_comment'    => 'rev_comment',
3210                                 'ar_user'       => 'rev_user',
3211                                 'ar_user_text'  => 'rev_user_text',
3212                                 'ar_timestamp'  => 'rev_timestamp',
3213                                 'ar_minor_edit' => 'rev_minor_edit',
3214                                 'ar_rev_id'     => 'rev_id',
3215                                 'ar_text_id'    => 'rev_text_id',
3216                                 'ar_text'       => '\'\'', // Be explicit to appease
3217                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3218                                 'ar_len'        => 'rev_len',
3219                                 'ar_page_id'    => 'page_id',
3220                                 'ar_deleted'    => $bitfield
3221                         ), array(
3222                                 'page_id' => $id,
3223                                 'page_id = rev_page'
3224                         ), __METHOD__
3225                 );
3226
3227                 # Delete restrictions for it
3228                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3229
3230                 # Now that it's safely backed up, delete it
3231                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3232                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3233
3234                 if ( !$ok ) {
3235                         $dbw->rollback();
3236                         return false;
3237                 }
3238
3239                 # Fix category table counts
3240                 $cats = array();
3241                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3242
3243                 foreach ( $res as $row ) {
3244                         $cats [] = $row->cl_to;
3245                 }
3246
3247                 $this->updateCategoryCounts( array(), $cats );
3248
3249                 # If using cascading deletes, we can skip some explicit deletes
3250                 if ( !$dbw->cascadingDeletes() ) {
3251                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3252
3253                         if ( $wgUseTrackbacks )
3254                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3255
3256                         # Delete outgoing links
3257                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3258                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3259                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3260                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3261                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3262                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3263                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3264                 }
3265
3266                 # If using cleanup triggers, we can skip some manual deletes
3267                 if ( !$dbw->cleanupTriggers() ) {
3268                         # Clean up recentchanges entries...
3269                         $dbw->delete( 'recentchanges',
3270                                 array( 'rc_type != ' . RC_LOG,
3271                                         'rc_namespace' => $this->mTitle->getNamespace(),
3272                                         'rc_title' => $this->mTitle->getDBkey() ),
3273                                 __METHOD__ );
3274                         $dbw->delete( 'recentchanges',
3275                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3276                                 __METHOD__ );
3277                 }
3278
3279                 # Clear caches
3280                 Article::onArticleDelete( $this->mTitle );
3281
3282                 # Clear the cached article id so the interface doesn't act like we exist
3283                 $this->mTitle->resetArticleID( 0 );
3284
3285                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3286                 $logtype = $suppress ? 'suppress' : 'delete';
3287                 $log = new LogPage( $logtype );
3288
3289                 # Make sure logging got through
3290                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3291
3292                 if ( $commit ) {
3293                         $dbw->commit();
3294                 }
3295
3296                 return true;
3297         }
3298
3299         /**
3300          * Roll back the most recent consecutive set of edits to a page
3301          * from the same user; fails if there are no eligible edits to
3302          * roll back to, e.g. user is the sole contributor. This function
3303          * performs permissions checks on $wgUser, then calls commitRollback()
3304          * to do the dirty work
3305          *
3306          * @param $fromP String: Name of the user whose edits to rollback.
3307          * @param $summary String: Custom summary. Set to default summary if empty.
3308          * @param $token String: Rollback token.
3309          * @param $bot Boolean: If true, mark all reverted edits as bot.
3310          *
3311          * @param $resultDetails Array: contains result-specific array of additional values
3312          *    'alreadyrolled' : 'current' (rev)
3313          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3314          *
3315          * @return array of errors, each error formatted as
3316          *   array(messagekey, param1, param2, ...).
3317          * On success, the array is empty.  This array can also be passed to
3318          * OutputPage::showPermissionsErrorPage().
3319          */
3320         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3321                 global $wgUser;
3322
3323                 $resultDetails = null;
3324
3325                 # Check permissions
3326                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3327                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3328                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3329
3330                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3331                         $errors[] = array( 'sessionfailure' );
3332                 }
3333
3334                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3335                         $errors[] = array( 'actionthrottledtext' );
3336                 }
3337
3338                 # If there were errors, bail out now
3339                 if ( !empty( $errors ) ) {
3340                         return $errors;
3341                 }
3342
3343                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3344         }
3345
3346         /**
3347          * Backend implementation of doRollback(), please refer there for parameter
3348          * and return value documentation
3349          *
3350          * NOTE: This function does NOT check ANY permissions, it just commits the
3351          * rollback to the DB Therefore, you should only call this function direct-
3352          * ly if you want to use custom permissions checks. If you don't, use
3353          * doRollback() instead.
3354          */
3355         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3356                 global $wgUseRCPatrol, $wgUser, $wgLang;
3357
3358                 $dbw = wfGetDB( DB_MASTER );
3359
3360                 if ( wfReadOnly() ) {
3361                         return array( array( 'readonlytext' ) );
3362                 }
3363
3364                 # Get the last editor
3365                 $current = Revision::newFromTitle( $this->mTitle );
3366                 if ( is_null( $current ) ) {
3367                         # Something wrong... no page?
3368                         return array( array( 'notanarticle' ) );
3369                 }
3370
3371                 $from = str_replace( '_', ' ', $fromP );
3372                 # User name given should match up with the top revision.
3373                 # If the user was deleted then $from should be empty.
3374                 if ( $from != $current->getUserText() ) {
3375                         $resultDetails = array( 'current' => $current );
3376                         return array( array( 'alreadyrolled',
3377                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3378                                 htmlspecialchars( $fromP ),
3379                                 htmlspecialchars( $current->getUserText() )
3380                         ) );
3381                 }
3382
3383                 # Get the last edit not by this guy...
3384                 # Note: these may not be public values
3385                 $user = intval( $current->getRawUser() );
3386                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3387                 $s = $dbw->selectRow( 'revision',
3388                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3389                         array( 'rev_page' => $current->getPage(),
3390                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3391                         ), __METHOD__,
3392                         array( 'USE INDEX' => 'page_timestamp',
3393                                 'ORDER BY' => 'rev_timestamp DESC' )
3394                         );
3395                 if ( $s === false ) {
3396                         # No one else ever edited this page
3397                         return array( array( 'cantrollback' ) );
3398                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3399                         # Only admins can see this text
3400                         return array( array( 'notvisiblerev' ) );
3401                 }
3402
3403                 $set = array();
3404                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3405                         # Mark all reverted edits as bot
3406                         $set['rc_bot'] = 1;
3407                 }
3408
3409                 if ( $wgUseRCPatrol ) {
3410                         # Mark all reverted edits as patrolled
3411                         $set['rc_patrolled'] = 1;
3412                 }
3413
3414                 if ( count( $set ) ) {
3415                         $dbw->update( 'recentchanges', $set,
3416                                 array( /* WHERE */
3417                                         'rc_cur_id' => $current->getPage(),
3418                                         'rc_user_text' => $current->getUserText(),
3419                                         "rc_timestamp > '{$s->rev_timestamp}'",
3420                                 ), __METHOD__
3421                         );
3422                 }
3423
3424                 # Generate the edit summary if necessary
3425                 $target = Revision::newFromId( $s->rev_id );
3426                 if ( empty( $summary ) ) {
3427                         if ( $from == '' ) { // no public user name
3428                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3429                         } else {
3430                                 $summary = wfMsgForContent( 'revertpage' );
3431                         }
3432                 }
3433
3434                 # Allow the custom summary to use the same args as the default message
3435                 $args = array(
3436                         $target->getUserText(), $from, $s->rev_id,
3437                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3438                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3439                 );
3440                 $summary = wfMsgReplaceArgs( $summary, $args );
3441
3442                 # Save
3443                 $flags = EDIT_UPDATE;
3444
3445                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3446                         $flags |= EDIT_MINOR;
3447                 }
3448
3449                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) ) {
3450                         $flags |= EDIT_FORCE_BOT;
3451                 }
3452
3453                 # Actually store the edit
3454                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3455                 if ( !empty( $status->value['revision'] ) ) {
3456                         $revId = $status->value['revision']->getId();
3457                 } else {
3458                         $revId = false;
3459                 }
3460
3461                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3462
3463                 $resultDetails = array(
3464                         'summary' => $summary,
3465                         'current' => $current,
3466                         'target'  => $target,
3467                         'newid'   => $revId
3468                 );
3469
3470                 return array();
3471         }
3472
3473         /**
3474          * User interface for rollback operations
3475          */
3476         public function rollback() {
3477                 global $wgUser, $wgOut, $wgRequest;
3478
3479                 $details = null;
3480
3481                 $result = $this->doRollback(
3482                         $wgRequest->getVal( 'from' ),
3483                         $wgRequest->getText( 'summary' ),
3484                         $wgRequest->getVal( 'token' ),
3485                         $wgRequest->getBool( 'bot' ),
3486                         $details
3487                 );
3488
3489                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3490                         $wgOut->rateLimited();
3491                         return;
3492                 }
3493
3494                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3495                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3496                         $errArray = $result[0];
3497                         $errMsg = array_shift( $errArray );
3498                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3499
3500                         if ( isset( $details['current'] ) ) {
3501                                 $current = $details['current'];
3502
3503                                 if ( $current->getComment() != '' ) {
3504                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3505                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3506                                 }
3507                         }
3508
3509                         return;
3510                 }
3511
3512                 # Display permissions errors before read-only message -- there's no
3513                 # point in misleading the user into thinking the inability to rollback
3514                 # is only temporary.
3515                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3516                         # array_diff is completely broken for arrays of arrays, sigh.
3517                         # Remove any 'readonlytext' error manually.
3518                         $out = array();
3519                         foreach ( $result as $error ) {
3520                                 if ( $error != array( 'readonlytext' ) ) {
3521                                         $out [] = $error;
3522                                 }
3523                         }
3524                         $wgOut->showPermissionsErrorPage( $out );
3525
3526                         return;
3527                 }
3528
3529                 if ( $result == array( array( 'readonlytext' ) ) ) {
3530                         $wgOut->readOnlyPage();
3531
3532                         return;
3533                 }
3534
3535                 $current = $details['current'];
3536                 $target = $details['target'];
3537                 $newId = $details['newid'];
3538                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3539                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3540
3541                 if ( $current->getUserText() === '' ) {
3542                         $old = wfMsg( 'rev-deleted-user' );
3543                 } else {
3544                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3545                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3546                 }
3547
3548                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3549                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3550                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3551                 $wgOut->returnToMain( false, $this->mTitle );
3552
3553                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3554                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3555                         $de->showDiff( '', '' );
3556                 }
3557         }
3558
3559         /**
3560          * Do standard deferred updates after page view
3561          */
3562         public function viewUpdates() {
3563                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3564                 if ( wfReadOnly() ) {
3565                         return;
3566                 }
3567
3568                 # Don't update page view counters on views from bot users (bug 14044)
3569                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3570                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
3571                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
3572                 }
3573
3574                 # Update newtalk / watchlist notification status
3575                 $wgUser->clearNotification( $this->mTitle );
3576         }
3577
3578         /**
3579          * Prepare text which is about to be saved.
3580          * Returns a stdclass with source, pst and output members
3581          */
3582         public function prepareTextForEdit( $text, $revid = null ) {
3583                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3584                         // Already prepared
3585                         return $this->mPreparedEdit;
3586                 }
3587
3588                 global $wgParser;
3589
3590                 $edit = (object)array();
3591                 $edit->revid = $revid;
3592                 $edit->newText = $text;
3593                 $edit->pst = $this->preSaveTransform( $text );
3594                 $edit->popts = $this->getParserOptions( true );
3595                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3596                 $edit->oldText = $this->getContent();
3597
3598                 $this->mPreparedEdit = $edit;
3599
3600                 return $edit;
3601         }
3602
3603         /**
3604          * Do standard deferred updates after page edit.
3605          * Update links tables, site stats, search index and message cache.
3606          * Purges pages that include this page if the text was changed here.
3607          * Every 100th edit, prune the recent changes table.
3608          *
3609          * @private
3610          * @param $text String: New text of the article
3611          * @param $summary String: Edit summary
3612          * @param $minoredit Boolean: Minor edit
3613          * @param $timestamp_of_pagechange Timestamp associated with the page change
3614          * @param $newid Integer: rev_id value of the new revision
3615          * @param $changed Boolean: Whether or not the content actually changed
3616          */
3617         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3618                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3619
3620                 wfProfileIn( __METHOD__ );
3621
3622                 # Parse the text
3623                 # Be careful not to double-PST: $text is usually already PST-ed once
3624                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3625                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3626                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3627                 } else {
3628                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3629                         $editInfo = $this->mPreparedEdit;
3630                 }
3631
3632                 # Save it to the parser cache
3633                 if ( $wgEnableParserCache ) {
3634                         $parserCache = ParserCache::singleton();
3635                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3636                 }
3637
3638                 # Update the links tables
3639                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3640                 $u->doUpdate();
3641
3642                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3643
3644                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3645                         if ( 0 == mt_rand( 0, 99 ) ) {
3646                                 // Flush old entries from the `recentchanges` table; we do this on
3647                                 // random requests so as to avoid an increase in writes for no good reason
3648                                 global $wgRCMaxAge;
3649
3650                                 $dbw = wfGetDB( DB_MASTER );
3651                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3652                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3653                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3654
3655                                 $dbw->query( $sql );
3656                         }
3657                 }
3658
3659                 $id = $this->getID();
3660                 $title = $this->mTitle->getPrefixedDBkey();
3661                 $shortTitle = $this->mTitle->getDBkey();
3662
3663                 if ( 0 == $id ) {
3664                         wfProfileOut( __METHOD__ );
3665                         return;
3666                 }
3667
3668                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3669                 array_push( $wgDeferredUpdateList, $u );
3670                 $u = new SearchUpdate( $id, $title, $text );
3671                 array_push( $wgDeferredUpdateList, $u );
3672
3673                 # If this is another user's talk page, update newtalk
3674                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3675                 # load of user talk pages and piss people off, nor if it's a minor edit
3676                 # by a properly-flagged bot.
3677                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3678                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3679                 ) {
3680                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3681                                 $other = User::newFromName( $shortTitle, false );
3682                                 if ( !$other ) {
3683                                         wfDebug( __METHOD__ . ": invalid username\n" );
3684                                 } elseif ( User::isIP( $shortTitle ) ) {
3685                                         // An anonymous user
3686                                         $other->setNewtalk( true );
3687                                 } elseif ( $other->isLoggedIn() ) {
3688                                         $other->setNewtalk( true );
3689                                 } else {
3690                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3691                                 }
3692                         }
3693                 }
3694
3695                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3696                         $wgMessageCache->replace( $shortTitle, $text );
3697                 }
3698
3699                 wfProfileOut( __METHOD__ );
3700         }
3701
3702         /**
3703          * Perform article updates on a special page creation.
3704          *
3705          * @param $rev Revision object
3706          *
3707          * @todo This is a shitty interface function. Kill it and replace the
3708          * other shitty functions like editUpdates and such so it's not needed
3709          * anymore.
3710          */
3711         public function createUpdates( $rev ) {
3712                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3713                 $this->mTotalAdjustment = 1;
3714                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3715                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3716         }
3717
3718         /**
3719          * Generate the navigation links when browsing through an article revisions
3720          * It shows the information as:
3721          *   Revision as of \<date\>; view current revision
3722          *   \<- Previous version | Next Version -\>
3723          *
3724          * @param $oldid String: revision ID of this article revision
3725          */
3726         public function setOldSubtitle( $oldid = 0 ) {
3727                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3728
3729                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3730                         return;
3731                 }
3732
3733                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3734
3735                 # Cascade unhide param in links for easy deletion browsing
3736                 $extraParams = array();
3737                 if ( $wgRequest->getVal( 'unhide' ) ) {
3738                         $extraParams['unhide'] = 1;
3739                 }
3740
3741                 $revision = Revision::newFromId( $oldid );
3742
3743                 $current = ( $oldid == $this->mLatest );
3744                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3745                 $tddate = $wgLang->date( $this->mTimestamp, true );
3746                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3747                 $sk = $wgUser->getSkin();
3748                 $lnk = $current
3749                         ? wfMsgHtml( 'currentrevisionlink' )
3750                         : $sk->link(
3751                                 $this->mTitle,
3752                                 wfMsgHtml( 'currentrevisionlink' ),
3753                                 array(),
3754                                 $extraParams,
3755                                 array( 'known', 'noclasses' )
3756                         );
3757                 $curdiff = $current
3758                         ? wfMsgHtml( 'diff' )
3759                         : $sk->link(
3760                                 $this->mTitle,
3761                                 wfMsgHtml( 'diff' ),
3762                                 array(),
3763                                 array(
3764                                         'diff' => 'cur',
3765                                         'oldid' => $oldid
3766                                 ) + $extraParams,
3767                                 array( 'known', 'noclasses' )
3768                         );
3769                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3770                 $prevlink = $prev
3771                         ? $sk->link(
3772                                 $this->mTitle,
3773                                 wfMsgHtml( 'previousrevision' ),
3774                                 array(),
3775                                 array(
3776                                         'direction' => 'prev',
3777                                         'oldid' => $oldid
3778                                 ) + $extraParams,
3779                                 array( 'known', 'noclasses' )
3780                         )
3781                         : wfMsgHtml( 'previousrevision' );
3782                 $prevdiff = $prev
3783                         ? $sk->link(
3784                                 $this->mTitle,
3785                                 wfMsgHtml( 'diff' ),
3786                                 array(),
3787                                 array(
3788                                         'diff' => 'prev',
3789                                         'oldid' => $oldid
3790                                 ) + $extraParams,
3791                                 array( 'known', 'noclasses' )
3792                         )
3793                         : wfMsgHtml( 'diff' );
3794                 $nextlink = $current
3795                         ? wfMsgHtml( 'nextrevision' )
3796                         : $sk->link(
3797                                 $this->mTitle,
3798                                 wfMsgHtml( 'nextrevision' ),
3799                                 array(),
3800                                 array(
3801                                         'direction' => 'next',
3802                                         'oldid' => $oldid
3803                                 ) + $extraParams,
3804                                 array( 'known', 'noclasses' )
3805                         );
3806                 $nextdiff = $current
3807                         ? wfMsgHtml( 'diff' )
3808                         : $sk->link(
3809                                 $this->mTitle,
3810                                 wfMsgHtml( 'diff' ),
3811                                 array(),
3812                                 array(
3813                                         'diff' => 'next',
3814                                         'oldid' => $oldid
3815                                 ) + $extraParams,
3816                                 array( 'known', 'noclasses' )
3817                         );
3818
3819                 $cdel = '';
3820
3821                 // User can delete revisions or view deleted revisions...
3822                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3823                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3824                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3825                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3826                         } else {
3827                                 $query = array(
3828                                         'type'   => 'revision',
3829                                         'target' => $this->mTitle->getPrefixedDbkey(),
3830                                         'ids'    => $oldid
3831                                 );
3832                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3833                         }
3834                         $cdel .= ' ';
3835                 }
3836
3837                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3838                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3839
3840                 $m = wfMsg( 'revision-info-current' );
3841                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3842                         ? 'revision-info-current'
3843                         : 'revision-info';
3844
3845                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3846                         wfMsgExt(
3847                                 $infomsg,
3848                                 array( 'parseinline', 'replaceafter' ),
3849                                 $td,
3850                                 $userlinks,
3851                                 $revision->getID(),
3852                                 $tddate,
3853                                 $tdtime,
3854                                 $revision->getUser()
3855                         ) .
3856                         "</div>\n" .
3857                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3858                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3859
3860                 $wgOut->setSubtitle( $r );
3861         }
3862
3863         /**
3864          * This function is called right before saving the wikitext,
3865          * so we can do things like signatures and links-in-context.
3866          *
3867          * @param $text String article contents
3868          * @return string article contents with altered wikitext markup (signatures
3869          *      converted, {{subst:}}, templates, etc.)
3870          */
3871         public function preSaveTransform( $text ) {
3872                 global $wgParser, $wgUser;
3873
3874                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3875         }
3876
3877         /* Caching functions */
3878
3879         /**
3880          * checkLastModified returns true if it has taken care of all
3881          * output to the client that is necessary for this request.
3882          * (that is, it has sent a cached version of the page)
3883          *
3884          * @return boolean true if cached version send, false otherwise
3885          */
3886         protected function tryFileCache() {
3887                 static $called = false;
3888
3889                 if ( $called ) {
3890                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3891                         return false;
3892                 }
3893
3894                 $called = true;
3895                 if ( $this->isFileCacheable() ) {
3896                         $cache = new HTMLFileCache( $this->mTitle );
3897                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3898                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3899                                 $cache->loadFromFileCache();
3900                                 return true;
3901                         } else {
3902                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3903                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3904                         }
3905                 } else {
3906                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3907                 }
3908
3909                 return false;
3910         }
3911
3912         /**
3913          * Check if the page can be cached
3914          * @return bool
3915          */
3916         public function isFileCacheable() {
3917                 $cacheable = false;
3918
3919                 if ( HTMLFileCache::useFileCache() ) {
3920                         $cacheable = $this->getID() && !$this->mRedirectedFrom && !$this->mTitle->isRedirect();
3921                         // Extension may have reason to disable file caching on some pages.
3922                         if ( $cacheable ) {
3923                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3924                         }
3925                 }
3926
3927                 return $cacheable;
3928         }
3929
3930         /**
3931          * Loads page_touched and returns a value indicating if it should be used
3932          * @return boolean true if not a redirect
3933          */
3934         public function checkTouched() {
3935                 if ( !$this->mDataLoaded ) {
3936                         $this->loadPageData();
3937                 }
3938
3939                 return !$this->mIsRedirect;
3940         }
3941
3942         /**
3943          * Get the page_touched field
3944          * @return string containing GMT timestamp
3945          */
3946         public function getTouched() {
3947                 if ( !$this->mDataLoaded ) {
3948                         $this->loadPageData();
3949                 }
3950
3951                 return $this->mTouched;
3952         }
3953
3954         /**
3955          * Get the page_latest field
3956          * @return integer rev_id of current revision
3957          */
3958         public function getLatest() {
3959                 if ( !$this->mDataLoaded ) {
3960                         $this->loadPageData();
3961                 }
3962
3963                 return (int)$this->mLatest;
3964         }
3965
3966         /**
3967          * Edit an article without doing all that other stuff
3968          * The article must already exist; link tables etc
3969          * are not updated, caches are not flushed.
3970          *
3971          * @param $text String: text submitted
3972          * @param $comment String: comment submitted
3973          * @param $minor Boolean: whereas it's a minor modification
3974          */
3975         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3976                 wfProfileIn( __METHOD__ );
3977
3978                 $dbw = wfGetDB( DB_MASTER );
3979                 $revision = new Revision( array(
3980                         'page'       => $this->getId(),
3981                         'text'       => $text,
3982                         'comment'    => $comment,
3983                         'minor_edit' => $minor ? 1 : 0,
3984                         ) );
3985                 $revision->insertOn( $dbw );
3986                 $this->updateRevisionOn( $dbw, $revision );
3987
3988                 global $wgUser;
3989                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3990
3991                 wfProfileOut( __METHOD__ );
3992         }
3993
3994         /**#@+
3995          * The onArticle*() functions are supposed to be a kind of hooks
3996          * which should be called whenever any of the specified actions
3997          * are done.
3998          *
3999          * This is a good place to put code to clear caches, for instance.
4000          *
4001          * This is called on page move and undelete, as well as edit
4002          *
4003          * @param $title a title object
4004          */
4005         public static function onArticleCreate( $title ) {
4006                 # Update existence markers on article/talk tabs...
4007                 if ( $title->isTalkPage() ) {
4008                         $other = $title->getSubjectPage();
4009                 } else {
4010                         $other = $title->getTalkPage();
4011                 }
4012
4013                 $other->invalidateCache();
4014                 $other->purgeSquid();
4015
4016                 $title->touchLinks();
4017                 $title->purgeSquid();
4018                 $title->deleteTitleProtection();
4019         }
4020
4021         /**
4022          * Clears caches when article is deleted
4023          */
4024         public static function onArticleDelete( $title ) {
4025                 global $wgMessageCache;
4026
4027                 # Update existence markers on article/talk tabs...
4028                 if ( $title->isTalkPage() ) {
4029                         $other = $title->getSubjectPage();
4030                 } else {
4031                         $other = $title->getTalkPage();
4032                 }
4033
4034                 $other->invalidateCache();
4035                 $other->purgeSquid();
4036
4037                 $title->touchLinks();
4038                 $title->purgeSquid();
4039
4040                 # File cache
4041                 HTMLFileCache::clearFileCache( $title );
4042
4043                 # Messages
4044                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4045                         $wgMessageCache->replace( $title->getDBkey(), false );
4046                 }
4047
4048                 # Images
4049                 if ( $title->getNamespace() == NS_FILE ) {
4050                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4051                         $update->doUpdate();
4052                 }
4053
4054                 # User talk pages
4055                 if ( $title->getNamespace() == NS_USER_TALK ) {
4056                         $user = User::newFromName( $title->getText(), false );
4057                         $user->setNewtalk( false );
4058                 }
4059
4060                 # Image redirects
4061                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4062         }
4063
4064         /**
4065          * Purge caches on page update etc
4066          *
4067          * @param $title Title object
4068          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4069          */
4070         public static function onArticleEdit( $title ) {
4071                 global $wgDeferredUpdateList;
4072
4073                 // Invalidate caches of articles which include this page
4074                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4075
4076                 // Invalidate the caches of all pages which redirect here
4077                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4078
4079                 # Purge squid for this page only
4080                 $title->purgeSquid();
4081
4082                 # Clear file cache for this page only
4083                 HTMLFileCache::clearFileCache( $title );
4084         }
4085
4086         /**#@-*/
4087
4088         /**
4089          * Overriden by ImagePage class, only present here to avoid a fatal error
4090          * Called for ?action=revert
4091          */
4092         public function revert() {
4093                 global $wgOut;
4094                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4095         }
4096
4097         /**
4098          * Info about this page
4099          * Called for ?action=info when $wgAllowPageInfo is on.
4100          */
4101         public function info() {
4102                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4103
4104                 if ( !$wgAllowPageInfo ) {
4105                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4106                         return;
4107                 }
4108
4109                 $page = $this->mTitle->getSubjectPage();
4110
4111                 $wgOut->setPagetitle( $page->getPrefixedText() );
4112                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4113                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4114
4115                 if ( !$this->mTitle->exists() ) {
4116                         $wgOut->addHTML( '<div class="noarticletext">' );
4117                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4118                                 // This doesn't quite make sense; the user is asking for
4119                                 // information about the _page_, not the message... -- RC
4120                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
4121                         } else {
4122                                 $msg = $wgUser->isLoggedIn()
4123                                         ? 'noarticletext'
4124                                         : 'noarticletextanon';
4125                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4126                         }
4127
4128                         $wgOut->addHTML( '</div>' );
4129                 } else {
4130                         $dbr = wfGetDB( DB_SLAVE );
4131                         $wl_clause = array(
4132                                 'wl_title'     => $page->getDBkey(),
4133                                 'wl_namespace' => $page->getNamespace() );
4134                         $numwatchers = $dbr->selectField(
4135                                 'watchlist',
4136                                 'COUNT(*)',
4137                                 $wl_clause,
4138                                 __METHOD__,
4139                                 $this->getSelectOptions() );
4140
4141                         $pageInfo = $this->pageCountInfo( $page );
4142                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4143
4144
4145                         //FIXME: unescaped messages
4146                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4147                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4148
4149                         if ( $talkInfo ) {
4150                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4151                         }
4152
4153                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4154
4155                         if ( $talkInfo ) {
4156                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4157                         }
4158
4159                         $wgOut->addHTML( '</ul>' );
4160                 }
4161         }
4162
4163         /**
4164          * Return the total number of edits and number of unique editors
4165          * on a given page. If page does not exist, returns false.
4166          *
4167          * @param $title Title object
4168          * @return mixed array or boolean false
4169          */
4170         public function pageCountInfo( $title ) {
4171                 $id = $title->getArticleId();
4172
4173                 if ( $id == 0 ) {
4174                         return false;
4175                 }
4176
4177                 $dbr = wfGetDB( DB_SLAVE );
4178                 $rev_clause = array( 'rev_page' => $id );
4179                 $edits = $dbr->selectField(
4180                         'revision',
4181                         'COUNT(rev_page)',
4182                         $rev_clause,
4183                         __METHOD__,
4184                         $this->getSelectOptions()
4185                 );
4186                 $authors = $dbr->selectField(
4187                         'revision',
4188                         'COUNT(DISTINCT rev_user_text)',
4189                         $rev_clause,
4190                         __METHOD__,
4191                         $this->getSelectOptions()
4192                 );
4193
4194                 return array( 'edits' => $edits, 'authors' => $authors );
4195         }
4196
4197         /**
4198          * Return a list of templates used by this article.
4199          * Uses the templatelinks table
4200          *
4201          * @return Array of Title objects
4202          */
4203         public function getUsedTemplates() {
4204                 $result = array();
4205                 $id = $this->mTitle->getArticleID();
4206
4207                 if ( $id == 0 ) {
4208                         return array();
4209                 }
4210
4211                 $dbr = wfGetDB( DB_SLAVE );
4212                 $res = $dbr->select( array( 'templatelinks' ),
4213                         array( 'tl_namespace', 'tl_title' ),
4214                         array( 'tl_from' => $id ),
4215                         __METHOD__ );
4216
4217                 if ( $res !== false ) {
4218                         foreach ( $res as $row ) {
4219                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4220                         }
4221                 }
4222
4223                 return $result;
4224         }
4225
4226         /**
4227          * Returns a list of hidden categories this page is a member of.
4228          * Uses the page_props and categorylinks tables.
4229          *
4230          * @return Array of Title objects
4231          */
4232         public function getHiddenCategories() {
4233                 $result = array();
4234                 $id = $this->mTitle->getArticleID();
4235
4236                 if ( $id == 0 ) {
4237                         return array();
4238                 }
4239
4240                 $dbr = wfGetDB( DB_SLAVE );
4241                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4242                         array( 'cl_to' ),
4243                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4244                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4245                         __METHOD__ );
4246
4247                 if ( $res !== false ) {
4248                         foreach ( $res as $row ) {
4249                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4250                         }
4251                 }
4252
4253                 return $result;
4254         }
4255
4256         /**
4257         * Return an applicable autosummary if one exists for the given edit.
4258         * @param $oldtext String: the previous text of the page.
4259         * @param $newtext String: The submitted text of the page.
4260         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4261         * @return string An appropriate autosummary, or an empty string.
4262         */
4263         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4264                 global $wgContLang;
4265
4266                 # Decide what kind of autosummary is needed.
4267
4268                 # Redirect autosummaries
4269                 $ot = Title::newFromRedirect( $oldtext );
4270                 $rt = Title::newFromRedirect( $newtext );
4271
4272                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4273                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4274                 }
4275
4276                 # New page autosummaries
4277                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4278                         # If they're making a new article, give its text, truncated, in the summary.
4279
4280                         $truncatedtext = $wgContLang->truncate(
4281                                 str_replace( "\n", ' ', $newtext ),
4282                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4283
4284                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4285                 }
4286
4287                 # Blanking autosummaries
4288                 if ( $oldtext != '' && $newtext == '' ) {
4289                         return wfMsgForContent( 'autosumm-blank' );
4290                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4291                         # Removing more than 90% of the article
4292
4293                         $truncatedtext = $wgContLang->truncate(
4294                                 $newtext,
4295                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4296
4297                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4298                 }
4299
4300                 # If we reach this point, there's no applicable autosummary for our case, so our
4301                 # autosummary is empty.
4302                 return '';
4303         }
4304
4305         /**
4306          * Add the primary page-view wikitext to the output buffer
4307          * Saves the text into the parser cache if possible.
4308          * Updates templatelinks if it is out of date.
4309          *
4310          * @param $text String
4311          * @param $cache Boolean
4312          * @param $parserOptions mixed ParserOptions object, or boolean false
4313          */
4314         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4315                 global $wgOut;
4316
4317                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4318                 $wgOut->addParserOutput( $this->mParserOutput );
4319         }
4320
4321         /**
4322          * This does all the heavy lifting for outputWikitext, except it returns the parser
4323          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4324          * say, embedding thread pages within a discussion system (LiquidThreads)
4325          *
4326          * @param $text string
4327          * @param $cache boolean
4328          * @param $parserOptions parsing options, defaults to false
4329          * @return string containing parsed output
4330          */
4331         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4332                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4333
4334                 if ( !$parserOptions ) {
4335                         $parserOptions = $this->getParserOptions();
4336                 }
4337
4338                 $time = - wfTime();
4339                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4340                         $parserOptions, true, true, $this->getRevIdFetched() );
4341                 $time += wfTime();
4342
4343                 # Timing hack
4344                 if ( $time > 3 ) {
4345                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4346                                 $this->mTitle->getPrefixedDBkey() ) );
4347                 }
4348
4349                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4350                         $parserCache = ParserCache::singleton();
4351                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4352                 }
4353
4354                 // Make sure file cache is not used on uncacheable content.
4355                 // Output that has magic words in it can still use the parser cache
4356                 // (if enabled), though it will generally expire sooner.
4357                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4358                         $wgUseFileCache = false;
4359                 }
4360
4361                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4362
4363                 return $this->mParserOutput;
4364         }
4365
4366         /**
4367          * Get parser options suitable for rendering the primary article wikitext
4368          * @param $canonical boolean Determines that the generated must not depend on user preferences (see bug 14404)
4369          * @return mixed ParserOptions object or boolean false
4370          */
4371         public function getParserOptions( $canonical = false ) {
4372                 global $wgUser, $wgLanguageCode;
4373
4374                 if ( !$this->mParserOptions || $canonical ) {
4375                         $user = !$canonical ? $wgUser : new User;
4376                         $parserOptions = new ParserOptions( $user );
4377                         $parserOptions->setTidy( true );
4378                         $parserOptions->enableLimitReport();
4379
4380                         if ( $canonical ) {
4381                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
4382                                 return $parserOptions;
4383                         }
4384                         $this->mParserOptions = $parserOptions;
4385                 }
4386
4387                 // Clone to allow modifications of the return value without affecting
4388                 // the cache
4389                 return clone $this->mParserOptions;
4390         }
4391
4392         /**
4393          * Updates cascading protections
4394          *
4395          * @param $parserOutput mixed ParserOptions object, or boolean false
4396          **/
4397         protected function doCascadeProtectionUpdates( $parserOutput ) {
4398                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4399                         return;
4400                 }
4401
4402                 // templatelinks table may have become out of sync,
4403                 // especially if using variable-based transclusions.
4404                 // For paranoia, check if things have changed and if
4405                 // so apply updates to the database. This will ensure
4406                 // that cascaded protections apply as soon as the changes
4407                 // are visible.
4408
4409                 # Get templates from templatelinks
4410                 $id = $this->mTitle->getArticleID();
4411
4412                 $tlTemplates = array();
4413
4414                 $dbr = wfGetDB( DB_SLAVE );
4415                 $res = $dbr->select( array( 'templatelinks' ),
4416                         array( 'tl_namespace', 'tl_title' ),
4417                         array( 'tl_from' => $id ),
4418                         __METHOD__
4419                 );
4420
4421                 foreach ( $res as $row ) {
4422                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4423                 }
4424
4425                 # Get templates from parser output.
4426                 $poTemplates = array();
4427                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4428                         foreach ( $templates as $dbk => $id ) {
4429                                 $poTemplates["$ns:$dbk"] = true;
4430                         }
4431                 }
4432
4433                 # Get the diff
4434                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4435
4436                 if ( count( $templates_diff ) > 0 ) {
4437                         # Whee, link updates time.
4438                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4439                         $u->doUpdate();
4440                 }
4441         }
4442
4443         /**
4444          * Update all the appropriate counts in the category table, given that
4445          * we've added the categories $added and deleted the categories $deleted.
4446          *
4447          * @param $added array   The names of categories that were added
4448          * @param $deleted array The names of categories that were deleted
4449          */
4450         public function updateCategoryCounts( $added, $deleted ) {
4451                 $ns = $this->mTitle->getNamespace();
4452                 $dbw = wfGetDB( DB_MASTER );
4453
4454                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4455                 # exist, we might legitimately not create it, but it's simpler to just
4456                 # create it and then give it a negative value, since the value is bogus
4457                 # anyway.
4458                 #
4459                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4460                 $insertCats = array_merge( $added, $deleted );
4461                 if ( !$insertCats ) {
4462                         # Okay, nothing to do
4463                         return;
4464                 }
4465
4466                 $insertRows = array();
4467
4468                 foreach ( $insertCats as $cat ) {
4469                         $insertRows[] = array(
4470                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4471                                 'cat_title' => $cat
4472                         );
4473                 }
4474                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4475
4476                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4477                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4478
4479                 if ( $ns == NS_CATEGORY ) {
4480                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4481                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4482                 } elseif ( $ns == NS_FILE ) {
4483                         $addFields[]    = 'cat_files = cat_files + 1';
4484                         $removeFields[] = 'cat_files = cat_files - 1';
4485                 }
4486
4487                 if ( $added ) {
4488                         $dbw->update(
4489                                 'category',
4490                                 $addFields,
4491                                 array( 'cat_title' => $added ),
4492                                 __METHOD__
4493                         );
4494                 }
4495
4496                 if ( $deleted ) {
4497                         $dbw->update(
4498                                 'category',
4499                                 $removeFields,
4500                                 array( 'cat_title' => $deleted ),
4501                                 __METHOD__
4502                         );
4503                 }
4504         }
4505
4506         /**
4507          * Lightweight method to get the parser output for a page, checking the parser cache
4508          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4509          * consider, so it's not appropriate to use there.
4510          *
4511          * @since 1.16 (r52326) for LiquidThreads
4512          *
4513          * @param $oldid mixed integer Revision ID or null
4514          * @return ParserOutput
4515          */
4516         public function getParserOutput( $oldid = null ) {
4517                 global $wgEnableParserCache, $wgUser;
4518
4519                 // Should the parser cache be used?
4520                 $useParserCache = $wgEnableParserCache &&
4521                         $wgUser->getStubThreshold() == 0 &&
4522                         $this->exists() &&
4523                         $oldid === null;
4524
4525                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4526
4527                 if ( $wgUser->getStubThreshold() ) {
4528                         wfIncrStats( 'pcache_miss_stub' );
4529                 }
4530
4531                 $parserOutput = false;
4532                 if ( $useParserCache ) {
4533                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4534                 }
4535
4536                 if ( $parserOutput === false ) {
4537                         // Cache miss; parse and output it.
4538                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4539
4540                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4541                 } else {
4542                         return $parserOutput;
4543                 }
4544         }
4545
4546         // Deprecated methods
4547         /**
4548          * Get the database which should be used for reads
4549          *
4550          * @return Database
4551          * @deprecated - just call wfGetDB( DB_MASTER ) instead
4552          */
4553         function getDB() {
4554                 wfDeprecated( __METHOD__ );
4555                 return wfGetDB( DB_MASTER );
4556         }
4557
4558 }
4559
4560 class PoolWorkArticleView extends PoolCounterWork {
4561         private $mArticle;
4562
4563         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4564                 parent::__construct( 'ArticleView', $key );
4565                 $this->mArticle = $article;
4566                 $this->cacheable = $useParserCache;
4567                 $this->parserOptions = $parserOptions;
4568         }
4569
4570         function doWork() {
4571                 return $this->mArticle->doViewParse();
4572         }
4573
4574         function getCachedWork() {
4575                 global $wgOut;
4576
4577                 $parserCache = ParserCache::singleton();
4578                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4579
4580                 if ( $this->mArticle->mParserOutput !== false ) {
4581                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4582                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4583                         # Ensure that UI elements requiring revision ID have
4584                         # the correct version information.
4585                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4586                         return true;
4587                 }
4588                 return false;
4589         }
4590
4591         function fallback() {
4592                 return $this->mArticle->tryDirtyCache();
4593         }
4594
4595         function error( $status ) {
4596                 global $wgOut;
4597
4598                 $wgOut->clearHTML(); // for release() errors
4599                 $wgOut->enableClientCache( false );
4600                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4601
4602                 $errortext = $status->getWikiText( false, 'view-pool-error' );
4603                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4604
4605                 return false;
4606         }
4607 }