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                                 return $this->mIsRedirect;
 672                         }
 673
 674                         // Apparently loadPageData was never called
 675                         $this->loadContent();
 676                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 677                 } else {
 678                         $titleObj = Title::newFromRedirect( $text );
 679                 }
 680
 681                 return $titleObj !== null;
 682         }
 683
 684         /**
 685          * Returns true if the currently-referenced revision is the current edit
 686          * to this page (and it exists).
 687          * @return bool
 688          */
 689         public function isCurrent() {
 690                 # If no oldid, this is the current version.
 691                 if ( $this->getOldID() == 0 ) {
 692                         return true;
 693                 }
 694
 695                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 696         }
 697
 698         /**
 699          * Loads everything except the text
 700          * This isn't necessary for all uses, so it's only done if needed.
 701          */
 702         protected function loadLastEdit() {
 703                 if ( -1 != $this->mUser ) {
 704                         return;
 705                 }
 706
 707                 # New or non-existent articles have no user information
 708                 $id = $this->getID();
 709                 if ( 0 == $id ) {
 710                         return;
 711                 }
 712
 713                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 714                 if ( !is_null( $this->mLastRevision ) ) {
 715                         $this->mUser      = $this->mLastRevision->getUser();
 716                         $this->mUserText  = $this->mLastRevision->getUserText();
 717                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 718                         $this->mComment   = $this->mLastRevision->getComment();
 719                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 720                         $this->mRevIdFetched = $this->mLastRevision->getId();
 721                 }
 722         }
 723
 724         /**
 725          * @return string GMT timestamp of last article revision
 726          **/
 727
 728         public function getTimestamp() {
 729                 // Check if the field has been filled by ParserCache::get()
 730                 if ( !$this->mTimestamp ) {
 731                         $this->loadLastEdit();
 732                 }
 733
 734                 return wfTimestamp( TS_MW, $this->mTimestamp );
 735         }
 736
 737         /**
 738          * @return int user ID for the user that made the last article revision
 739          */
 740         public function getUser() {
 741                 $this->loadLastEdit();
 742                 return $this->mUser;
 743         }
 744
 745         /**
 746          * @return string username of the user that made the last article revision
 747          */
 748         public function getUserText() {
 749                 $this->loadLastEdit();
 750                 return $this->mUserText;
 751         }
 752
 753         /**
 754          * @return string Comment stored for the last article revision
 755          */
 756         public function getComment() {
 757                 $this->loadLastEdit();
 758                 return $this->mComment;
 759         }
 760
 761         /**
 762          * Returns true if last revision was marked as "minor edit"
 763          *
 764          * @return boolean Minor edit indicator for the last article revision.
 765          */
 766         public function getMinorEdit() {
 767                 $this->loadLastEdit();
 768                 return $this->mMinorEdit;
 769         }
 770
 771         /**
 772          * Use this to fetch the rev ID used on page views
 773          *
 774          * @return int revision ID of last article revision
 775          */
 776         public function getRevIdFetched() {
 777                 $this->loadLastEdit();
 778                 return $this->mRevIdFetched;
 779         }
 780
 781         /**
 782          * FIXME: this does what?
 783          * @param $limit Integer: default 0.
 784          * @param $offset Integer: default 0.
 785          * @return UserArrayFromResult object with User objects of article contributors for requested range
 786          */
 787         public function getContributors( $limit = 0, $offset = 0 ) {
 788                 # FIXME: this is expensive; cache this info somewhere.
 789
 790                 $dbr = wfGetDB( DB_SLAVE );
 791                 $revTable = $dbr->tableName( 'revision' );
 792                 $userTable = $dbr->tableName( 'user' );
 793
 794                 $pageId = $this->getId();
 795
 796                 $user = $this->getUser();
 797
 798                 if ( $user ) {
 799                         $excludeCond = "AND rev_user != $user";
 800                 } else {
 801                         $userText = $dbr->addQuotes( $this->getUserText() );
 802                         $excludeCond = "AND rev_user_text != $userText";
 803                 }
 804
 805                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 806
 807                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 808                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 809                         WHERE rev_page = $pageId
 810                         $excludeCond
 811                         AND $deletedBit = 0
 812                         GROUP BY rev_user, rev_user_text
 813                         ORDER BY timestamp DESC";
 814
 815                 if ( $limit > 0 ) {
 816                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 817                 }
 818
 819                 $sql .= ' ' . $this->getSelectOptions();
 820                 $res = $dbr->query( $sql, __METHOD__ );
 821
 822                 return new UserArrayFromResult( $res );
 823         }
 824
 825         /**
 826          * This is the default action of the index.php entry point: just view the
 827          * page of the given title.
 828          */
 829         public function view() {
 830                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 831                 global $wgUseFileCache, $wgUseETag;
 832
 833                 wfProfileIn( __METHOD__ );
 834
 835                 # Get variables from query string
 836                 $oldid = $this->getOldID();
 837                 $parserCache = ParserCache::singleton();
 838
 839                 $parserOptions = $this->getParserOptions();
 840                 # Render printable version, use printable version cache
 841                 if ( $wgOut->isPrintable() ) {
 842                         $parserOptions->setIsPrintable( true );
 843                         $parserOptions->setEditSection( false );
 844                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 845                         $parserOptions->setEditSection( false );
 846                 }
 847
 848                 # Try client and file cache
 849                 if ( $oldid === 0 && $this->checkTouched() ) {
 850                         if ( $wgUseETag ) {
 851                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 852                         }
 853
 854                         # Is it client cached?
 855                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 856                                 wfDebug( __METHOD__ . ": done 304\n" );
 857                                 wfProfileOut( __METHOD__ );
 858
 859                                 return;
 860                         # Try file cache
 861                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 862                                 wfDebug( __METHOD__ . ": done file cache\n" );
 863                                 # tell wgOut that output is taken care of
 864                                 $wgOut->disable();
 865                                 $this->viewUpdates();
 866                                 wfProfileOut( __METHOD__ );
 867
 868                                 return;
 869                         }
 870                 }
 871
 872                 # getOldID may want us to redirect somewhere else
 873                 if ( $this->mRedirectUrl ) {
 874                         $wgOut->redirect( $this->mRedirectUrl );
 875                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 876                         wfProfileOut( __METHOD__ );
 877
 878                         return;
 879                 }
 880
 881                 $wgOut->setArticleFlag( true );
 882                 # Set page title (may be overridden by DISPLAYTITLE)
 883                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 884
 885                 # If we got diff in the query, we want to see a diff page instead of the article.
 886                 if ( $wgRequest->getCheck( 'diff' ) ) {
 887                         wfDebug( __METHOD__ . ": showing diff page\n" );
 888                         $this->showDiffPage();
 889                         wfProfileOut( __METHOD__ );
 890
 891                         return;
 892                 }
 893
 894                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 895                         $parserOptions->setEditSection( false );
 896                 }
 897
 898                 # Should the parser cache be used?
 899                 $useParserCache = $this->useParserCache( $oldid );
 900                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 901                 if ( $wgUser->getStubThreshold() ) {
 902                         wfIncrStats( 'pcache_miss_stub' );
 903                 }
 904
 905                 $wasRedirected = $this->showRedirectedFromHeader();
 906                 $this->showNamespaceHeader();
 907
 908                 # Iterate through the possible ways of constructing the output text.
 909                 # Keep going until $outputDone is set, or we run out of things to do.
 910                 $pass = 0;
 911                 $outputDone = false;
 912                 $this->mParserOutput = false;
 913
 914                 while ( !$outputDone && ++$pass ) {
 915                         switch( $pass ) {
 916                                 case 1:
 917                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 918                                         break;
 919                                 case 2:
 920                                         # Try the parser cache
 921                                         if ( $useParserCache ) {
 922                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 923
 924                                                 if ( $this->mParserOutput !== false ) {
 925                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 926                                                         $wgOut->addParserOutput( $this->mParserOutput );
 927                                                         # Ensure that UI elements requiring revision ID have
 928                                                         # the correct version information.
 929                                                         $wgOut->setRevisionId( $this->mLatest );
 930                                                         $outputDone = true;
 931                                                 }
 932                                         }
 933                                         break;
 934                                 case 3:
 935                                         $text = $this->getContent();
 936                                         if ( $text === false || $this->getID() == 0 ) {
 937                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 938                                                 $this->showMissingArticle();
 939                                                 wfProfileOut( __METHOD__ );
 940                                                 return;
 941                                         }
 942
 943                                         # Another whitelist check in case oldid is altering the title
 944                                         if ( !$this->mTitle->userCanRead() ) {
 945                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 946                                                 $wgOut->loginToUse();
 947                                                 $wgOut->output();
 948                                                 $wgOut->disable();
 949                                                 wfProfileOut( __METHOD__ );
 950                                                 return;
 951                                         }
 952
 953                                         # Are we looking at an old revision
 954                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 955                                                 $this->setOldSubtitle( $oldid );
 956
 957                                                 if ( !$this->showDeletedRevisionHeader() ) {
 958                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 959                                                         wfProfileOut( __METHOD__ );
 960                                                         return;
 961                                                 }
 962
 963                                                 # If this "old" version is the current, then try the parser cache...
 964                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 965                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 966                                                         if ( $this->mParserOutput ) {
 967                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 968                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 969                                                                 $wgOut->setRevisionId( $this->mLatest );
 970                                                                 $outputDone = true;
 971                                                                 break;
 972                                                         }
 973                                                 }
 974                                         }
 975
 976                                         # Ensure that UI elements requiring revision ID have
 977                                         # the correct version information.
 978                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 979
 980                                         # Pages containing custom CSS or JavaScript get special treatment
 981                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 982                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 983                                                 $this->showCssOrJsPage();
 984                                                 $outputDone = true;
 985                                         } else {
 986                                                 $rt = Title::newFromRedirectArray( $text );
 987                                                 if ( $rt ) {
 988                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 989                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 990                                                         # Don't append the subtitle if this was an old revision
 991                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 992                                                         # Parse just to get categories, displaytitle, etc.
 993                                                         $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 994                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 995                                                         $outputDone = true;
 996                                                 }
 997                                         }
 998                                         break;
 999                                 case 4:
1000                                         # Run the parse, protected by a pool counter
1001                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1002
1003                                         $key = $parserCache->getKey( $this, $parserOptions );
1004                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1005
1006                                         if ( !$poolArticleView->execute() ) {
1007                                                 # Connection or timeout error
1008                                                 wfProfileOut( __METHOD__ );
1009                                                 return;
1010                                         } else {
1011                                                 $outputDone = true;
1012                                         }
1013                                         break;
1014                                 # Should be unreachable, but just in case...
1015                                 default:
1016                                         break 2;
1017                         }
1018                 }
1019
1020                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1021                 if ( $this->mParserOutput ) {
1022                         $titleText = $this->mParserOutput->getTitleText();
1023
1024                         if ( strval( $titleText ) !== '' ) {
1025                                 $wgOut->setPageTitle( $titleText );
1026                         }
1027                 }
1028
1029                 # For the main page, overwrite the <title> element with the con-
1030                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1031                 # that's not empty).
1032                 # This message always exists because it is in the i18n files
1033                 if ( $this->mTitle->equals( Title::newMainPage() )
1034                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
1035                 {
1036                         $wgOut->setHTMLTitle( $m );
1037                 }
1038
1039                 # Now that we've filled $this->mParserOutput, we know whether
1040                 # there are any __NOINDEX__ tags on the page
1041                 $policy = $this->getRobotPolicy( 'view' );
1042                 $wgOut->setIndexPolicy( $policy['index'] );
1043                 $wgOut->setFollowPolicy( $policy['follow'] );
1044
1045                 $this->showViewFooter();
1046                 $this->viewUpdates();
1047                 wfProfileOut( __METHOD__ );
1048         }
1049
1050         /**
1051          * Show a diff page according to current request variables. For use within
1052          * Article::view() only, other callers should use the DifferenceEngine class.
1053          */
1054         public function showDiffPage() {
1055                 global $wgRequest, $wgUser;
1056
1057                 $diff = $wgRequest->getVal( 'diff' );
1058                 $rcid = $wgRequest->getVal( 'rcid' );
1059                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1060                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1061                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1062                 $oldid = $this->getOldID();
1063
1064                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1065                 // DifferenceEngine directly fetched the revision:
1066                 $this->mRevIdFetched = $de->mNewid;
1067                 $de->showDiffPage( $diffOnly );
1068
1069                 // Needed to get the page's current revision
1070                 $this->loadPageData();
1071                 if ( $diff == 0 || $diff == $this->mLatest ) {
1072                         # Run view updates for current revision only
1073                         $this->viewUpdates();
1074                 }
1075         }
1076
1077         /**
1078          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1079          * Article::view() only.
1080          *
1081          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1082          * page views.
1083          */
1084         protected function showCssOrJsPage() {
1085                 global $wgOut;
1086
1087                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1088
1089                 // Give hooks a chance to customise the output
1090                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1091                         // Wrap the whole lot in a <pre> and don't parse
1092                         $m = array();
1093                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1094                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1095                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1096                         $wgOut->addHTML( "\n</pre>\n" );
1097                 }
1098         }
1099
1100         /**
1101          * Get the robot policy to be used for the current view
1102          * @param $action String the action= GET parameter
1103          * @return Array the policy that should be set
1104          * TODO: actions other than 'view'
1105          */
1106         public function getRobotPolicy( $action ) {
1107                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1108                 global $wgDefaultRobotPolicy, $wgRequest;
1109
1110                 $ns = $this->mTitle->getNamespace();
1111
1112                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1113                         # Don't index user and user talk pages for blocked users (bug 11443)
1114                         if ( !$this->mTitle->isSubpage() ) {
1115                                 $block = new Block();
1116                                 if ( $block->load( $this->mTitle->getText() ) ) {
1117                                         return array(
1118                                                 'index'  => 'noindex',
1119                                                 'follow' => 'nofollow'
1120                                         );
1121                                 }
1122                         }
1123                 }
1124
1125                 if ( $this->getID() === 0 || $this->getOldID() ) {
1126                         # Non-articles (special pages etc), and old revisions
1127                         return array(
1128                                 'index'  => 'noindex',
1129                                 'follow' => 'nofollow'
1130                         );
1131                 } elseif ( $wgOut->isPrintable() ) {
1132                         # Discourage indexing of printable versions, but encourage following
1133                         return array(
1134                                 'index'  => 'noindex',
1135                                 'follow' => 'follow'
1136                         );
1137                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1138                         # For ?curid=x urls, disallow indexing
1139                         return array(
1140                                 'index'  => 'noindex',
1141                                 'follow' => 'follow'
1142                         );
1143                 }
1144
1145                 # Otherwise, construct the policy based on the various config variables.
1146                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1147
1148                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1149                         # Honour customised robot policies for this namespace
1150                         $policy = array_merge(
1151                                 $policy,
1152                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1153                         );
1154                 }
1155                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1156                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1157                         # a final sanity check that we have really got the parser output.
1158                         $policy = array_merge(
1159                                 $policy,
1160                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1161                         );
1162                 }
1163
1164                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1165                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1166                         $policy = array_merge(
1167                                 $policy,
1168                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1169                         );
1170                 }
1171
1172                 return $policy;
1173         }
1174
1175         /**
1176          * Converts a String robot policy into an associative array, to allow
1177          * merging of several policies using array_merge().
1178          * @param $policy Mixed, returns empty array on null/false/'', transparent
1179          *            to already-converted arrays, converts String.
1180          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1181          */
1182         public static function formatRobotPolicy( $policy ) {
1183                 if ( is_array( $policy ) ) {
1184                         return $policy;
1185                 } elseif ( !$policy ) {
1186                         return array();
1187                 }
1188
1189                 $policy = explode( ',', $policy );
1190                 $policy = array_map( 'trim', $policy );
1191
1192                 $arr = array();
1193                 foreach ( $policy as $var ) {
1194                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1195                                 $arr['index'] = $var;
1196                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1197                                 $arr['follow'] = $var;
1198                         }
1199                 }
1200
1201                 return $arr;
1202         }
1203
1204         /**
1205          * If this request is a redirect view, send "redirected from" subtitle to
1206          * $wgOut. Returns true if the header was needed, false if this is not a
1207          * redirect view. Handles both local and remote redirects.
1208          *
1209          * @return boolean
1210          */
1211         public function showRedirectedFromHeader() {
1212                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1213
1214                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1215                 $sk = $wgUser->getSkin();
1216
1217                 if ( isset( $this->mRedirectedFrom ) ) {
1218                         // This is an internally redirected page view.
1219                         // We'll need a backlink to the source page for navigation.
1220                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1221                                 $redir = $sk->link(
1222                                         $this->mRedirectedFrom,
1223                                         null,
1224                                         array(),
1225                                         array( 'redirect' => 'no' ),
1226                                         array( 'known', 'noclasses' )
1227                                 );
1228
1229                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1230                                 $wgOut->setSubtitle( $s );
1231
1232                                 // Set the fragment if one was specified in the redirect
1233                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1234                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1235                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1236                                 }
1237
1238                                 // Add a <link rel="canonical"> tag
1239                                 $wgOut->addLink( array( 'rel' => 'canonical',
1240                                         'href' => $this->mTitle->getLocalURL() )
1241                                 );
1242
1243                                 return true;
1244                         }
1245                 } elseif ( $rdfrom ) {
1246                         // This is an externally redirected view, from some other wiki.
1247                         // If it was reported from a trusted site, supply a backlink.
1248                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1249                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1250                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1251                                 $wgOut->setSubtitle( $s );
1252
1253                                 return true;
1254                         }
1255                 }
1256
1257                 return false;
1258         }
1259
1260         /**
1261          * Show a header specific to the namespace currently being viewed, like
1262          * [[MediaWiki:Talkpagetext]]. For Article::view().
1263          */
1264         public function showNamespaceHeader() {
1265                 global $wgOut;
1266
1267                 if ( $this->mTitle->isTalkPage() ) {
1268                         $msg = wfMsgNoTrans( 'talkpageheader' );
1269                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1270                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1271                         }
1272                 }
1273         }
1274
1275         /**
1276          * Show the footer section of an ordinary page view
1277          */
1278         public function showViewFooter() {
1279                 global $wgOut, $wgUseTrackbacks;
1280
1281                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1282                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1283                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1284                 }
1285
1286                 # If we have been passed an &rcid= parameter, we want to give the user a
1287                 # chance to mark this new article as patrolled.
1288                 $this->showPatrolFooter();
1289
1290                 # Trackbacks
1291                 if ( $wgUseTrackbacks ) {
1292                         $this->addTrackbacks();
1293                 }
1294         }
1295
1296         /**
1297          * If patrol is possible, output a patrol UI box. This is called from the
1298          * footer section of ordinary page views. If patrol is not possible or not
1299          * desired, does nothing.
1300          */
1301         public function showPatrolFooter() {
1302                 global $wgOut, $wgRequest, $wgUser;
1303
1304                 $rcid = $wgRequest->getVal( 'rcid' );
1305
1306                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1307                         return;
1308                 }
1309
1310                 $sk = $wgUser->getSkin();
1311                 $token = $wgUser->editToken( $rcid );
1312
1313                 $wgOut->addHTML(
1314                         "<div class='patrollink'>" .
1315                                 wfMsgHtml(
1316                                         'markaspatrolledlink',
1317                                         $sk->link(
1318                                                 $this->mTitle,
1319                                                 wfMsgHtml( 'markaspatrolledtext' ),
1320                                                 array(),
1321                                                 array(
1322                                                         'action' => 'markpatrolled',
1323                                                         'rcid' => $rcid,
1324                                                         'token' => $token,
1325                                                 ),
1326                                                 array( 'known', 'noclasses' )
1327                                         )
1328                                 ) .
1329                         '</div>'
1330                 );
1331         }
1332
1333         /**
1334          * Show the error text for a missing article. For articles in the MediaWiki
1335          * namespace, show the default message text. To be called from Article::view().
1336          */
1337         public function showMissingArticle() {
1338                 global $wgOut, $wgRequest, $wgUser;
1339
1340                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1341                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1342                         $parts = explode( '/', $this->mTitle->getText() );
1343                         $rootPart = $parts[0];
1344                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1345                         $ip = User::isIP( $rootPart );
1346
1347                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1348                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1349                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1350                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1351                                 LogEventsList::showLogExtract(
1352                                         $wgOut,
1353                                         'block',
1354                                         $user->getUserPage()->getPrefixedText(),
1355                                         '',
1356                                         array(
1357                                                 'lim' => 1,
1358                                                 'showIfEmpty' => false,
1359                                                 'msgKey' => array(
1360                                                         'blocked-notice-logextract',
1361                                                         $user->getName() # Support GENDER in notice
1362                                                 )
1363                                         )
1364                                 );
1365                         }
1366                 }
1367
1368                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1369
1370                 # Show delete and move logs
1371                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1372                         array(  'lim' => 10,
1373                                 'conds' => array( "log_action != 'revision'" ),
1374                                 'showIfEmpty' => false,
1375                                 'msgKey' => array( 'moveddeleted-notice' ) )
1376                 );
1377
1378                 # Show error message
1379                 $oldid = $this->getOldID();
1380                 if ( $oldid ) {
1381                         $text = wfMsgNoTrans( 'missing-article',
1382                                 $this->mTitle->getPrefixedText(),
1383                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1384                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1385                         // Use the default message text
1386                         $text = $this->getContent();
1387                 } else {
1388                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1389                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1390                         $errors = array_merge( $createErrors, $editErrors );
1391
1392                         if ( !count( $errors ) ) {
1393                                 $text = wfMsgNoTrans( 'noarticletext' );
1394                         } else {
1395                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1396                         }
1397                 }
1398                 $text = "<div class='noarticletext'>\n$text\n</div>";
1399
1400                 if ( !$this->hasViewableContent() ) {
1401                         // If there's no backing content, send a 404 Not Found
1402                         // for better machine handling of broken links.
1403                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1404                 }
1405
1406                 $wgOut->addWikiText( $text );
1407         }
1408
1409         /**
1410          * If the revision requested for view is deleted, check permissions.
1411          * Send either an error message or a warning header to $wgOut.
1412          *
1413          * @return boolean true if the view is allowed, false if not.
1414          */
1415         public function showDeletedRevisionHeader() {
1416                 global $wgOut, $wgRequest;
1417
1418                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1419                         // Not deleted
1420                         return true;
1421                 }
1422
1423                 // If the user is not allowed to see it...
1424                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1425                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1426                                 'rev-deleted-text-permission' );
1427
1428                         return false;
1429                 // If the user needs to confirm that they want to see it...
1430                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1431                         # Give explanation and add a link to view the revision...
1432                         $oldid = intval( $this->getOldID() );
1433                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1434                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1435                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1436                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1437                                 array( $msg, $link ) );
1438
1439                         return false;
1440                 // We are allowed to see...
1441                 } else {
1442                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1443                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1444                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1445
1446                         return true;
1447                 }
1448         }
1449
1450         /**
1451          * Should the parser cache be used?
1452          *
1453          * @return boolean
1454          */
1455         public function useParserCache( $oldid ) {
1456                 global $wgUser, $wgEnableParserCache;
1457
1458                 return $wgEnableParserCache
1459                         && $wgUser->getStubThreshold() == 0
1460                         && $this->exists()
1461                         && empty( $oldid )
1462                         && !$this->mTitle->isCssOrJsPage()
1463                         && !$this->mTitle->isCssJsSubpage();
1464         }
1465
1466         /**
1467          * Execute the uncached parse for action=view
1468          */
1469         public function doViewParse() {
1470                 global $wgOut;
1471
1472                 $oldid = $this->getOldID();
1473                 $parserOptions = $this->getParserOptions();
1474
1475                 # Render printable version, use printable version cache
1476                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1477
1478                 # Don't show section-edit links on old revisions... this way lies madness.
1479                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->mTitle->quickUserCan( 'edit' ) ) {
1480                         $parserOptions->setEditSection( false );
1481                 }
1482
1483                 $useParserCache = $this->useParserCache( $oldid );
1484                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1485
1486                 return true;
1487         }
1488
1489         /**
1490          * Try to fetch an expired entry from the parser cache. If it is present,
1491          * output it and return true. If it is not present, output nothing and
1492          * return false. This is used as a callback function for
1493          * PoolCounter::executeProtected().
1494          *
1495          * @return boolean
1496          */
1497         public function tryDirtyCache() {
1498                 global $wgOut;
1499                 $parserCache = ParserCache::singleton();
1500                 $options = $this->getParserOptions();
1501
1502                 if ( $wgOut->isPrintable() ) {
1503                         $options->setIsPrintable( true );
1504                         $options->setEditSection( false );
1505                 }
1506
1507                 $output = $parserCache->getDirty( $this, $options );
1508
1509                 if ( $output ) {
1510                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1511                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1512                         $wgOut->setSquidMaxage( 0 );
1513                         $this->mParserOutput = $output;
1514                         $wgOut->addParserOutput( $output );
1515                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1516
1517                         return true;
1518                 } else {
1519                         wfDebugLog( 'dirty', "dirty missing\n" );
1520                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1521
1522                         return false;
1523                 }
1524         }
1525
1526         /**
1527          * View redirect
1528          *
1529          * @param $target Title object or Array of destination(s) to redirect
1530          * @param $appendSubtitle Boolean [optional]
1531          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1532          * @return string containing HMTL with redirect link
1533          */
1534         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1535                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1536
1537                 if ( !is_array( $target ) ) {
1538                         $target = array( $target );
1539                 }
1540
1541                 $imageDir = $wgContLang->getDir();
1542
1543                 if ( $appendSubtitle ) {
1544                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1545                 }
1546
1547                 $sk = $wgUser->getSkin();
1548                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1549                 $title = array_shift( $target );
1550
1551                 if ( $forceKnown ) {
1552                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1553                 } else {
1554                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1555                 }
1556
1557                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1558                 $alt = $wgContLang->isRTL() ? '←' : '→';
1559                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1560                 // FIXME: where this happens?
1561                 foreach ( $target as $rt ) {
1562                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1563                         if ( $forceKnown ) {
1564                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText() ) );
1565                         } else {
1566                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1567                         }
1568                 }
1569
1570                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1571                 return '<div class="redirectMsg">' .
1572                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1573                         '<span class="redirectText">' . $link . '</span></div>';
1574         }
1575
1576         /**
1577          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1578          */
1579         public function addTrackbacks() {
1580                 global $wgOut, $wgUser;
1581
1582                 $dbr = wfGetDB( DB_SLAVE );
1583                 $tbs = $dbr->select( 'trackbacks',
1584                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1585                         array( 'tb_page' => $this->getID() )
1586                 );
1587
1588                 if ( !$dbr->numRows( $tbs ) ) {
1589                         return;
1590                 }
1591
1592                 $tbtext = "";
1593                 foreach ( $tbs as $o ) {
1594                         $rmvtxt = "";
1595
1596                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1597                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1598                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1599                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1600                         }
1601
1602                         $tbtext .= "\n";
1603                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1604                                         $o->tb_title,
1605                                         $o->tb_url,
1606                                         $o->tb_ex,
1607                                         $o->tb_name,
1608                                         $rmvtxt );
1609                 }
1610
1611                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1612         }
1613
1614         /**
1615          * Removes trackback record for current article from trackbacks table
1616          */
1617         public function deletetrackback() {
1618                 global $wgUser, $wgRequest, $wgOut;
1619
1620                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1621                         $wgOut->addWikiMsg( 'sessionfailure' );
1622
1623                         return;
1624                 }
1625
1626                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1627
1628                 if ( count( $permission_errors ) ) {
1629                         $wgOut->showPermissionsErrorPage( $permission_errors );
1630
1631                         return;
1632                 }
1633
1634                 $db = wfGetDB( DB_MASTER );
1635                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1636
1637                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1638                 $this->mTitle->invalidateCache();
1639         }
1640
1641         /**
1642          * Handle action=render
1643          */
1644
1645         public function render() {
1646                 global $wgOut;
1647
1648                 $wgOut->setArticleBodyOnly( true );
1649                 $this->view();
1650         }
1651
1652         /**
1653          * Handle action=purge
1654          */
1655         public function purge() {
1656                 global $wgUser, $wgRequest, $wgOut;
1657
1658                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1659                         //FIXME: shouldn't this be in doPurge()?
1660                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1661                                 $this->doPurge();
1662                                 $this->view();
1663                         }
1664                 } else {
1665                         $formParams = array(
1666                                 'method' => 'post',
1667                                 'action' =>  $wgRequest->getRequestURL(),
1668                         );
1669
1670                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1671
1672                         $form  = Html::openElement( 'form', $formParams );
1673                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1674                         $form .= Html::closeElement( 'form' );
1675
1676                         $wgOut->addHTML( $form );
1677                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1678
1679                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1680                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1681                 }
1682         }
1683
1684         /**
1685          * Perform the actions of a page purging
1686          */
1687         public function doPurge() {
1688                 global $wgUseSquid;
1689
1690                 // Invalidate the cache
1691                 $this->mTitle->invalidateCache();
1692                 $this->clear();
1693
1694                 if ( $wgUseSquid ) {
1695                         // Commit the transaction before the purge is sent
1696                         $dbw = wfGetDB( DB_MASTER );
1697                         $dbw->commit();
1698
1699                         // Send purge
1700                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1701                         $update->doUpdate();
1702                 }
1703
1704                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1705                         global $wgMessageCache;
1706
1707                         if ( $this->getID() == 0 ) {
1708                                 $text = false;
1709                         } else {
1710                                 $text = $this->getRawText();
1711                         }
1712
1713                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1714                 }
1715         }
1716
1717         /**
1718          * Insert a new empty page record for this article.
1719          * This *must* be followed up by creating a revision
1720          * and running $this->updateRevisionOn( ... );
1721          * or else the record will be left in a funky state.
1722          * Best if all done inside a transaction.
1723          *
1724          * @param $dbw Database
1725          * @return int The newly created page_id key, or false if the title already existed
1726          * @private
1727          */
1728         public function insertOn( $dbw ) {
1729                 wfProfileIn( __METHOD__ );
1730
1731                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1732                 $dbw->insert( 'page', array(
1733                         'page_id'           => $page_id,
1734                         'page_namespace'    => $this->mTitle->getNamespace(),
1735                         'page_title'        => $this->mTitle->getDBkey(),
1736                         'page_counter'      => 0,
1737                         'page_restrictions' => '',
1738                         'page_is_redirect'  => 0, # Will set this shortly...
1739                         'page_is_new'       => 1,
1740                         'page_random'       => wfRandom(),
1741                         'page_touched'      => $dbw->timestamp(),
1742                         'page_latest'       => 0, # Fill this in shortly...
1743                         'page_len'          => 0, # Fill this in shortly...
1744                 ), __METHOD__, 'IGNORE' );
1745
1746                 $affected = $dbw->affectedRows();
1747
1748                 if ( $affected ) {
1749                         $newid = $dbw->insertId();
1750                         $this->mTitle->resetArticleId( $newid );
1751                 }
1752                 wfProfileOut( __METHOD__ );
1753
1754                 return $affected ? $newid : false;
1755         }
1756
1757         /**
1758          * Update the page record to point to a newly saved revision.
1759          *
1760          * @param $dbw DatabaseBase: object
1761          * @param $revision Revision: For ID number, and text used to set
1762                             length and redirect status fields
1763          * @param $lastRevision Integer: if given, will not overwrite the page field
1764          *                      when different from the currently set value.
1765          *                      Giving 0 indicates the new page flag should be set
1766          *                      on.
1767          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1768          *                           removing rows in redirect table.
1769          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1770          *                    Needed when $lastRevision has to be set to sth. !=0
1771          * @return bool true on success, false on failure
1772          * @private
1773          */
1774         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1775                 wfProfileIn( __METHOD__ );
1776
1777                 $text = $revision->getText();
1778                 $rt = Title::newFromRedirectRecurse( $text );
1779
1780                 $conditions = array( 'page_id' => $this->getId() );
1781
1782                 if ( !is_null( $lastRevision ) ) {
1783                         # An extra check against threads stepping on each other
1784                         $conditions['page_latest'] = $lastRevision;
1785                 }
1786
1787                 if ( !$setNewFlag ) {
1788                         $setNewFlag = ( $lastRevision === 0 );
1789                 }
1790
1791                 $dbw->update( 'page',
1792                         array( /* SET */
1793                                 'page_latest'      => $revision->getId(),
1794                                 'page_touched'     => $dbw->timestamp(),
1795                                 'page_is_new'      => $setNewFlag,
1796                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1797                                 'page_len'         => strlen( $text ),
1798                         ),
1799                         $conditions,
1800                         __METHOD__ );
1801
1802                 $result = $dbw->affectedRows() != 0;
1803                 if ( $result ) {
1804                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1805                 }
1806
1807                 wfProfileOut( __METHOD__ );
1808                 return $result;
1809         }
1810
1811         /**
1812          * Add row to the redirect table if this is a redirect, remove otherwise.
1813          *
1814          * @param $dbw Database
1815          * @param $redirectTitle a title object pointing to the redirect target,
1816          *                       or NULL if this is not a redirect
1817          * @param $lastRevIsRedirect If given, will optimize adding and
1818          *                           removing rows in redirect table.
1819          * @return bool true on success, false on failure
1820          * @private
1821          */
1822         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1823                 // Always update redirects (target link might have changed)
1824                 // Update/Insert if we don't know if the last revision was a redirect or not
1825                 // Delete if changing from redirect to non-redirect
1826                 $isRedirect = !is_null( $redirectTitle );
1827
1828                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1829                         wfProfileIn( __METHOD__ );
1830                         if ( $isRedirect ) {
1831                                 $this->insertRedirectEntry( $redirectTitle );
1832                         } else {
1833                                 // This is not a redirect, remove row from redirect table
1834                                 $where = array( 'rd_from' => $this->getId() );
1835                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1836                         }
1837
1838                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1839                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1840                         }
1841                         wfProfileOut( __METHOD__ );
1842
1843                         return ( $dbw->affectedRows() != 0 );
1844                 }
1845
1846                 return true;
1847         }
1848
1849         /**
1850          * If the given revision is newer than the currently set page_latest,
1851          * update the page record. Otherwise, do nothing.
1852          *
1853          * @param $dbw Database object
1854          * @param $revision Revision object
1855          * @return mixed
1856          */
1857         public function updateIfNewerOn( &$dbw, $revision ) {
1858                 wfProfileIn( __METHOD__ );
1859
1860                 $row = $dbw->selectRow(
1861                         array( 'revision', 'page' ),
1862                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1863                         array(
1864                                 'page_id' => $this->getId(),
1865                                 'page_latest=rev_id' ),
1866                         __METHOD__ );
1867
1868                 if ( $row ) {
1869                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1870                                 wfProfileOut( __METHOD__ );
1871                                 return false;
1872                         }
1873                         $prev = $row->rev_id;
1874                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1875                 } else {
1876                         # No or missing previous revision; mark the page as new
1877                         $prev = 0;
1878                         $lastRevIsRedirect = null;
1879                 }
1880
1881                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1882
1883                 wfProfileOut( __METHOD__ );
1884                 return $ret;
1885         }
1886
1887         /**
1888          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1889          * @param $text String: new text of the section
1890          * @param $summary String: new section's subject, only if $section is 'new'
1891          * @param $edittime String: revision timestamp or null to use the current revision
1892          * @return string Complete article text, or null if error
1893          */
1894         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1895                 wfProfileIn( __METHOD__ );
1896
1897                 if ( strval( $section ) == '' ) {
1898                         // Whole-page edit; let the whole text through
1899                 } else {
1900                         if ( is_null( $edittime ) ) {
1901                                 $rev = Revision::newFromTitle( $this->mTitle );
1902                         } else {
1903                                 $dbw = wfGetDB( DB_MASTER );
1904                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1905                         }
1906
1907                         if ( !$rev ) {
1908                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1909                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1910                                 return null;
1911                         }
1912
1913                         $oldtext = $rev->getText();
1914
1915                         if ( $section == 'new' ) {
1916                                 # Inserting a new section
1917                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1918                                 $text = strlen( trim( $oldtext ) ) > 0
1919                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1920                                                 : "{$subject}{$text}";
1921                         } else {
1922                                 # Replacing an existing section; roll out the big guns
1923                                 global $wgParser;
1924
1925                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1926                         }
1927                 }
1928
1929                 wfProfileOut( __METHOD__ );
1930                 return $text;
1931         }
1932
1933         /**
1934          * This function is not deprecated until somebody fixes the core not to use
1935          * it. Nevertheless, use Article::doEdit() instead.
1936          */
1937         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1938                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1939                         ( $isminor ? EDIT_MINOR : 0 ) |
1940                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1941                         ( $bot ? EDIT_FORCE_BOT : 0 );
1942
1943                 # If this is a comment, add the summary as headline
1944                 if ( $comment && $summary != "" ) {
1945                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1946                 }
1947                 $this->doEdit( $text, $summary, $flags );
1948
1949                 $dbw = wfGetDB( DB_MASTER );
1950                 if ( $watchthis ) {
1951                         if ( !$this->mTitle->userIsWatching() ) {
1952                                 $dbw->begin();
1953                                 $this->doWatch();
1954                                 $dbw->commit();
1955                         }
1956                 } else {
1957                         if ( $this->mTitle->userIsWatching() ) {
1958                                 $dbw->begin();
1959                                 $this->doUnwatch();
1960                                 $dbw->commit();
1961                         }
1962                 }
1963                 $this->doRedirect( $this->isRedirect( $text ) );
1964         }
1965
1966         /**
1967          * @deprecated use Article::doEdit()
1968          */
1969         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1970                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1971                         ( $minor ? EDIT_MINOR : 0 ) |
1972                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1973
1974                 $status = $this->doEdit( $text, $summary, $flags );
1975
1976                 if ( !$status->isOK() ) {
1977                         return false;
1978                 }
1979
1980                 $dbw = wfGetDB( DB_MASTER );
1981                 if ( $watchthis ) {
1982                         if ( !$this->mTitle->userIsWatching() ) {
1983                                 $dbw->begin();
1984                                 $this->doWatch();
1985                                 $dbw->commit();
1986                         }
1987                 } else {
1988                         if ( $this->mTitle->userIsWatching() ) {
1989                                 $dbw->begin();
1990                                 $this->doUnwatch();
1991                                 $dbw->commit();
1992                         }
1993                 }
1994
1995                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1996                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1997
1998                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1999                 return true;
2000         }
2001
2002         /**
2003          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
2004          * @param $flags Int
2005          * @return Int updated $flags
2006          */
2007         function checkFlags( $flags ) {
2008                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
2009                         if ( $this->mTitle->getArticleID() ) {
2010                                 $flags |= EDIT_UPDATE;
2011                         } else {
2012                                 $flags |= EDIT_NEW;
2013                         }
2014                 }
2015
2016                 return $flags;
2017         }
2018
2019         /**
2020          * Article::doEdit()
2021          *
2022          * Change an existing article or create a new article. Updates RC and all necessary caches,
2023          * optionally via the deferred update array.
2024          *
2025          * $wgUser must be set before calling this function.
2026          *
2027          * @param $text String: new text
2028          * @param $summary String: edit summary
2029          * @param $flags Integer bitfield:
2030          *      EDIT_NEW
2031          *          Article is known or assumed to be non-existent, create a new one
2032          *      EDIT_UPDATE
2033          *          Article is known or assumed to be pre-existing, update it
2034          *      EDIT_MINOR
2035          *          Mark this edit minor, if the user is allowed to do so
2036          *      EDIT_SUPPRESS_RC
2037          *          Do not log the change in recentchanges
2038          *      EDIT_FORCE_BOT
2039          *          Mark the edit a "bot" edit regardless of user rights
2040          *      EDIT_DEFER_UPDATES
2041          *          Defer some of the updates until the end of index.php
2042          *      EDIT_AUTOSUMMARY
2043          *          Fill in blank summaries with generated text where possible
2044          *
2045          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2046          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2047          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2048          * edit-already-exists error will be returned. These two conditions are also possible with
2049          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2050          *
2051          * @param $baseRevId the revision ID this edit was based off, if any
2052          * @param $user Optional user object, $wgUser will be used if not passed
2053          *
2054          * @return Status object. Possible errors:
2055          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2056          *     edit-gone-missing:       In update mode, but the article didn't exist
2057          *     edit-conflict:           In update mode, the article changed unexpectedly
2058          *     edit-no-change:          Warning that the text was the same as before
2059          *     edit-already-exists:     In creation mode, but the article already exists
2060          *
2061          *  Extensions may define additional errors.
2062          *
2063          *  $return->value will contain an associative array with members as follows:
2064          *     new:                     Boolean indicating if the function attempted to create a new article
2065          *     revision:                The revision object for the inserted revision, or null
2066          *
2067          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2068          */
2069         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2070                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2071
2072                 # Low-level sanity check
2073                 if ( $this->mTitle->getText() === '' ) {
2074                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2075                 }
2076
2077                 wfProfileIn( __METHOD__ );
2078
2079                 $user = is_null( $user ) ? $wgUser : $user;
2080                 $status = Status::newGood( array() );
2081
2082                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2083                 $this->loadPageData();
2084
2085                 $flags = $this->checkFlags( $flags );
2086
2087                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2088                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2089                 {
2090                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2091                         wfProfileOut( __METHOD__ );
2092
2093                         if ( $status->isOK() ) {
2094                                 $status->fatal( 'edit-hook-aborted' );
2095                         }
2096
2097                         return $status;
2098                 }
2099
2100                 # Silently ignore EDIT_MINOR if not allowed
2101                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2102                 $bot = $flags & EDIT_FORCE_BOT;
2103
2104                 $oldtext = $this->getRawText(); // current revision
2105                 $oldsize = strlen( $oldtext );
2106
2107                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2108                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2109                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2110                 }
2111
2112                 $editInfo = $this->prepareTextForEdit( $text );
2113                 $text = $editInfo->pst;
2114                 $newsize = strlen( $text );
2115
2116                 $dbw = wfGetDB( DB_MASTER );
2117                 $now = wfTimestampNow();
2118                 $this->mTimestamp = $now;
2119
2120                 if ( $flags & EDIT_UPDATE ) {
2121                         # Update article, but only if changed.
2122                         $status->value['new'] = false;
2123
2124                         # Make sure the revision is either completely inserted or not inserted at all
2125                         if ( !$wgDBtransactions ) {
2126                                 $userAbort = ignore_user_abort( true );
2127                         }
2128
2129                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2130
2131                         if ( $changed ) {
2132                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2133                                   - (int)$this->isCountable( $oldtext );
2134                                 $this->mTotalAdjustment = 0;
2135
2136                                 if ( !$this->mLatest ) {
2137                                         # Article gone missing
2138                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2139                                         $status->fatal( 'edit-gone-missing' );
2140
2141                                         wfProfileOut( __METHOD__ );
2142                                         return $status;
2143                                 }
2144
2145                                 $revision = new Revision( array(
2146                                         'page'       => $this->getId(),
2147                                         'comment'    => $summary,
2148                                         'minor_edit' => $isminor,
2149                                         'text'       => $text,
2150                                         'parent_id'  => $this->mLatest,
2151                                         'user'       => $user->getId(),
2152                                         'user_text'  => $user->getName(),
2153                                         'timestamp'  => $now
2154                                 ) );
2155
2156                                 $dbw->begin();
2157                                 $revisionId = $revision->insertOn( $dbw );
2158
2159                                 # Update page
2160                                 #
2161                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2162                                 # during the course of this function. This makes sure that EditPage can detect
2163                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2164                                 # before this function is called. A previous function used a separate query, this
2165                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2166                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2167
2168                                 if ( !$ok ) {
2169                                         /* Belated edit conflict! Run away!! */
2170                                         $status->fatal( 'edit-conflict' );
2171
2172                                         # Delete the invalid revision if the DB is not transactional
2173                                         if ( !$wgDBtransactions ) {
2174                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2175                                         }
2176
2177                                         $revisionId = 0;
2178                                         $dbw->rollback();
2179                                 } else {
2180                                         global $wgUseRCPatrol;
2181                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2182                                         # Update recentchanges
2183                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2184                                                 # Mark as patrolled if the user can do so
2185                                                 $patrolled = $wgUseRCPatrol && !count(
2186                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2187                                                 # Add RC row to the DB
2188                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2189                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2190                                                         $revisionId, $patrolled
2191                                                 );
2192
2193                                                 # Log auto-patrolled edits
2194                                                 if ( $patrolled ) {
2195                                                         PatrolLog::record( $rc, true );
2196                                                 }
2197                                         }
2198                                         $user->incEditCount();
2199                                         $dbw->commit();
2200                                 }
2201                         } else {
2202                                 $status->warning( 'edit-no-change' );
2203                                 $revision = null;
2204                                 // Keep the same revision ID, but do some updates on it
2205                                 $revisionId = $this->getRevIdFetched();
2206                                 // Update page_touched, this is usually implicit in the page update
2207                                 // Other cache updates are done in onArticleEdit()
2208                                 $this->mTitle->invalidateCache();
2209                         }
2210
2211                         if ( !$wgDBtransactions ) {
2212                                 ignore_user_abort( $userAbort );
2213                         }
2214
2215                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2216                         if ( !$status->isOK() ) {
2217                                 wfProfileOut( __METHOD__ );
2218                                 return $status;
2219                         }
2220
2221                         # Invalidate cache of this article and all pages using this article
2222                         # as a template. Partly deferred.
2223                         Article::onArticleEdit( $this->mTitle );
2224                         # Update links tables, site stats, etc.
2225                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2226                 } else {
2227                         # Create new article
2228                         $status->value['new'] = true;
2229
2230                         # Set statistics members
2231                         # We work out if it's countable after PST to avoid counter drift
2232                         # when articles are created with {{subst:}}
2233                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2234                         $this->mTotalAdjustment = 1;
2235
2236                         $dbw->begin();
2237
2238                         # Add the page record; stake our claim on this title!
2239                         # This will return false if the article already exists
2240                         $newid = $this->insertOn( $dbw );
2241
2242                         if ( $newid === false ) {
2243                                 $dbw->rollback();
2244                                 $status->fatal( 'edit-already-exists' );
2245
2246                                 wfProfileOut( __METHOD__ );
2247                                 return $status;
2248                         }
2249
2250                         # Save the revision text...
2251                         $revision = new Revision( array(
2252                                 'page'       => $newid,
2253                                 'comment'    => $summary,
2254                                 'minor_edit' => $isminor,
2255                                 'text'       => $text,
2256                                 'user'       => $user->getId(),
2257                                 'user_text'  => $user->getName(),
2258                                 'timestamp'  => $now
2259                         ) );
2260                         $revisionId = $revision->insertOn( $dbw );
2261
2262                         $this->mTitle->resetArticleID( $newid );
2263
2264                         # Update the page record with revision data
2265                         $this->updateRevisionOn( $dbw, $revision, 0 );
2266
2267                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2268
2269                         # Update recentchanges
2270                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2271                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2272
2273                                 # Mark as patrolled if the user can do so
2274                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
2275                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2276                                 # Add RC row to the DB
2277                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2278                                         '', strlen( $text ), $revisionId, $patrolled );
2279
2280                                 # Log auto-patrolled edits
2281                                 if ( $patrolled ) {
2282                                         PatrolLog::record( $rc, true );
2283                                 }
2284                         }
2285                         $user->incEditCount();
2286                         $dbw->commit();
2287
2288                         # Update links, etc.
2289                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2290
2291                         # Clear caches
2292                         Article::onArticleCreate( $this->mTitle );
2293
2294                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2295                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2296                 }
2297
2298                 # Do updates right now unless deferral was requested
2299                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2300                         wfDoUpdates();
2301                 }
2302
2303                 // Return the new revision (or null) to the caller
2304                 $status->value['revision'] = $revision;
2305
2306                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2307                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2308
2309                 wfProfileOut( __METHOD__ );
2310                 return $status;
2311         }
2312
2313         /**
2314          * @deprecated wrapper for doRedirect
2315          */
2316         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2317                 wfDeprecated( __METHOD__ );
2318                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2319         }
2320
2321         /**
2322          * Output a redirect back to the article.
2323          * This is typically used after an edit.
2324          *
2325          * @param $noRedir Boolean: add redirect=no
2326          * @param $sectionAnchor String: section to redirect to, including "#"
2327          * @param $extraQuery String: extra query params
2328          */
2329         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2330                 global $wgOut;
2331
2332                 if ( $noRedir ) {
2333                         $query = 'redirect=no';
2334                         if ( $extraQuery )
2335                                 $query .= "&$extraQuery";
2336                 } else {
2337                         $query = $extraQuery;
2338                 }
2339
2340                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2341         }
2342
2343         /**
2344          * Mark this particular edit/page as patrolled
2345          */
2346         public function markpatrolled() {
2347                 global $wgOut, $wgUser, $wgRequest;
2348
2349                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2350
2351                 # If we haven't been given an rc_id value, we can't do anything
2352                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2353
2354                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $rcid ) ) {
2355                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2356                         return;
2357                 }
2358
2359                 $rc = RecentChange::newFromId( $rcid );
2360
2361                 if ( is_null( $rc ) ) {
2362                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2363                         return;
2364                 }
2365
2366                 # It would be nice to see where the user had actually come from, but for now just guess
2367                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2368                 $return = SpecialPage::getTitleFor( $returnto );
2369
2370                 $errors = $rc->doMarkPatrolled();
2371
2372                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2373                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2374
2375                         return;
2376                 }
2377
2378                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2379                         // The hook itself has handled any output
2380                         return;
2381                 }
2382
2383                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2384                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2385                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2386                         $wgOut->returnToMain( false, $return );
2387
2388                         return;
2389                 }
2390
2391                 if ( !empty( $errors ) ) {
2392                         $wgOut->showPermissionsErrorPage( $errors );
2393
2394                         return;
2395                 }
2396
2397                 # Inform the user
2398                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2399                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2400                 $wgOut->returnToMain( false, $return );
2401         }
2402
2403         /**
2404          * User-interface handler for the "watch" action
2405          */
2406         public function watch() {
2407                 global $wgUser, $wgOut;
2408
2409                 if ( $wgUser->isAnon() ) {
2410                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2411                         return;
2412                 }
2413
2414                 if ( wfReadOnly() ) {
2415                         $wgOut->readOnlyPage();
2416                         return;
2417                 }
2418
2419                 if ( $this->doWatch() ) {
2420                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2421                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2422                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2423                 }
2424
2425                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2426         }
2427
2428         /**
2429          * Add this page to $wgUser's watchlist
2430          * @return bool true on successful watch operation
2431          */
2432         public function doWatch() {
2433                 global $wgUser;
2434
2435                 if ( $wgUser->isAnon() ) {
2436                         return false;
2437                 }
2438
2439                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2440                         $wgUser->addWatch( $this->mTitle );
2441                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2442                 }
2443
2444                 return false;
2445         }
2446
2447         /**
2448          * User interface handler for the "unwatch" action.
2449          */
2450         public function unwatch() {
2451                 global $wgUser, $wgOut;
2452
2453                 if ( $wgUser->isAnon() ) {
2454                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2455                         return;
2456                 }
2457
2458                 if ( wfReadOnly() ) {
2459                         $wgOut->readOnlyPage();
2460                         return;
2461                 }
2462
2463                 if ( $this->doUnwatch() ) {
2464                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2465                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2466                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2467                 }
2468
2469                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2470         }
2471
2472         /**
2473          * Stop watching a page
2474          * @return bool true on successful unwatch
2475          */
2476         public function doUnwatch() {
2477                 global $wgUser;
2478
2479                 if ( $wgUser->isAnon() ) {
2480                         return false;
2481                 }
2482
2483                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2484                         $wgUser->removeWatch( $this->mTitle );
2485                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2486                 }
2487
2488                 return false;
2489         }
2490
2491         /**
2492          * action=protect handler
2493          */
2494         public function protect() {
2495                 $form = new ProtectionForm( $this );
2496                 $form->execute();
2497         }
2498
2499         /**
2500          * action=unprotect handler (alias)
2501          */
2502         public function unprotect() {
2503                 $this->protect();
2504         }
2505
2506         /**
2507          * Update the article's restriction field, and leave a log entry.
2508          *
2509          * @param $limit Array: set of restriction keys
2510          * @param $reason String
2511          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2512          * @param $expiry Array: per restriction type expiration
2513          * @return bool true on success
2514          */
2515         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2516                 global $wgUser, $wgContLang;
2517
2518                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2519
2520                 $id = $this->mTitle->getArticleID();
2521
2522                 if ( $id <= 0 ) {
2523                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
2524                         return false;
2525                 }
2526
2527                 if ( wfReadOnly() ) {
2528                         wfDebug( "updateRestrictions failed: read-only\n" );
2529                         return false;
2530                 }
2531
2532                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2533                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2534                         return false;
2535                 }
2536
2537                 if ( !$cascade ) {
2538                         $cascade = false;
2539                 }
2540
2541                 // Take this opportunity to purge out expired restrictions
2542                 Title::purgeExpiredRestrictions();
2543
2544                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2545                 # we expect a single selection, but the schema allows otherwise.
2546                 $current = array();
2547                 $updated = Article::flattenRestrictions( $limit );
2548                 $changed = false;
2549
2550                 foreach ( $restrictionTypes as $action ) {
2551                         if ( isset( $expiry[$action] ) ) {
2552                                 # Get current restrictions on $action
2553                                 $aLimits = $this->mTitle->getRestrictions( $action );
2554                                 $current[$action] = implode( '', $aLimits );
2555                                 # Are any actual restrictions being dealt with here?
2556                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2557
2558                                 # If something changed, we need to log it. Checking $aRChanged
2559                                 # assures that "unprotecting" a page that is not protected does
2560                                 # not log just because the expiry was "changed".
2561                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2562                                         $changed = true;
2563                                 }
2564                         }
2565                 }
2566
2567                 $current = Article::flattenRestrictions( $current );
2568
2569                 $changed = ( $changed || $current != $updated );
2570                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2571                 $protect = ( $updated != '' );
2572
2573                 # If nothing's changed, do nothing
2574                 if ( $changed ) {
2575                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2576                                 $dbw = wfGetDB( DB_MASTER );
2577
2578                                 # Prepare a null revision to be added to the history
2579                                 $modified = $current != '' && $protect;
2580
2581                                 if ( $protect ) {
2582                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2583                                 } else {
2584                                         $comment_type = 'unprotectedarticle';
2585                                 }
2586
2587                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2588
2589                                 # Only restrictions with the 'protect' right can cascade...
2590                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2591                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2592
2593                                 # The schema allows multiple restrictions
2594                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2595                                         $cascade = false;
2596                                 }
2597
2598                                 $cascade_description = '';
2599
2600                                 if ( $cascade ) {
2601                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2602                                 }
2603
2604                                 if ( $reason ) {
2605                                         $comment .= ": $reason";
2606                                 }
2607
2608                                 $editComment = $comment;
2609                                 $encodedExpiry = array();
2610                                 $protect_description = '';
2611                                 foreach ( $limit as $action => $restrictions ) {
2612                                         if ( !isset( $expiry[$action] ) )
2613                                                 $expiry[$action] = Block::infinity();
2614
2615                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2616                                         if ( $restrictions != '' ) {
2617                                                 $protect_description .= "[$action=$restrictions] (";
2618                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2619                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2620                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2621                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2622                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2623                                                 } else {
2624                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2625                                                 }
2626
2627                                                 $protect_description .= ') ';
2628                                         }
2629                                 }
2630                                 $protect_description = trim( $protect_description );
2631
2632                                 if ( $protect_description && $protect ) {
2633                                         $editComment .= " ($protect_description)";
2634                                 }
2635
2636                                 if ( $cascade ) {
2637                                         $editComment .= "$cascade_description";
2638                                 }
2639
2640                                 # Update restrictions table
2641                                 foreach ( $limit as $action => $restrictions ) {
2642                                         if ( $restrictions != '' ) {
2643                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2644                                                         array( 'pr_page' => $id,
2645                                                                 'pr_type' => $action,
2646                                                                 'pr_level' => $restrictions,
2647                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2648                                                                 'pr_expiry' => $encodedExpiry[$action]
2649                                                         ),
2650                                                         __METHOD__
2651                                                 );
2652                                         } else {
2653                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2654                                                         'pr_type' => $action ), __METHOD__ );
2655                                         }
2656                                 }
2657
2658                                 # Insert a null revision
2659                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2660                                 $nullRevId = $nullRevision->insertOn( $dbw );
2661
2662                                 $latest = $this->getLatest();
2663                                 # Update page record
2664                                 $dbw->update( 'page',
2665                                         array( /* SET */
2666                                                 'page_touched' => $dbw->timestamp(),
2667                                                 'page_restrictions' => '',
2668                                                 'page_latest' => $nullRevId
2669                                         ), array( /* WHERE */
2670                                                 'page_id' => $id
2671                                         ), 'Article::protect'
2672                                 );
2673
2674                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2675                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2676
2677                                 # Update the protection log
2678                                 $log = new LogPage( 'protect' );
2679                                 if ( $protect ) {
2680                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2681                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2682                                 } else {
2683                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2684                                 }
2685                         } # End hook
2686                 } # End "changed" check
2687
2688                 return true;
2689         }
2690
2691         /**
2692          * Take an array of page restrictions and flatten it to a string
2693          * suitable for insertion into the page_restrictions field.
2694          * @param $limit Array
2695          * @return String
2696          */
2697         protected static function flattenRestrictions( $limit ) {
2698                 if ( !is_array( $limit ) ) {
2699                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2700                 }
2701
2702                 $bits = array();
2703                 ksort( $limit );
2704
2705                 foreach ( $limit as $action => $restrictions ) {
2706                         if ( $restrictions != '' ) {
2707                                 $bits[] = "$action=$restrictions";
2708                         }
2709                 }
2710
2711                 return implode( ':', $bits );
2712         }
2713
2714         /**
2715          * Auto-generates a deletion reason
2716          *
2717          * @param &$hasHistory Boolean: whether the page has a history
2718          * @return mixed String containing deletion reason or empty string, or boolean false
2719          *    if no revision occurred
2720          */
2721         public function generateReason( &$hasHistory ) {
2722                 global $wgContLang;
2723
2724                 $dbw = wfGetDB( DB_MASTER );
2725                 // Get the last revision
2726                 $rev = Revision::newFromTitle( $this->mTitle );
2727
2728                 if ( is_null( $rev ) ) {
2729                         return false;
2730                 }
2731
2732                 // Get the article's contents
2733                 $contents = $rev->getText();
2734                 $blank = false;
2735
2736                 // If the page is blank, use the text from the previous revision,
2737                 // which can only be blank if there's a move/import/protect dummy revision involved
2738                 if ( $contents == '' ) {
2739                         $prev = $rev->getPrevious();
2740
2741                         if ( $prev )    {
2742                                 $contents = $prev->getText();
2743                                 $blank = true;
2744                         }
2745                 }
2746
2747                 // Find out if there was only one contributor
2748                 // Only scan the last 20 revisions
2749                 $res = $dbw->select( 'revision', 'rev_user_text',
2750                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2751                         __METHOD__,
2752                         array( 'LIMIT' => 20 )
2753                 );
2754
2755                 if ( $res === false ) {
2756                         // This page has no revisions, which is very weird
2757                         return false;
2758                 }
2759
2760                 $hasHistory = ( $res->numRows() > 1 );
2761                 $row = $dbw->fetchObject( $res );
2762
2763                 if ( $row ) { // $row is false if the only contributor is hidden
2764                         $onlyAuthor = $row->rev_user_text;
2765                         // Try to find a second contributor
2766                         foreach ( $res as $row ) {
2767                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2768                                         $onlyAuthor = false;
2769                                         break;
2770                                 }
2771                         }
2772                 } else {
2773                         $onlyAuthor = false;
2774                 }
2775
2776                 // Generate the summary with a '$1' placeholder
2777                 if ( $blank ) {
2778                         // The current revision is blank and the one before is also
2779                         // blank. It's just not our lucky day
2780                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2781                 } else {
2782                         if ( $onlyAuthor ) {
2783                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2784                         } else {
2785                                 $reason = wfMsgForContent( 'excontent', '$1' );
2786                         }
2787                 }
2788
2789                 if ( $reason == '-' ) {
2790                         // Allow these UI messages to be blanked out cleanly
2791                         return '';
2792                 }
2793
2794                 // Replace newlines with spaces to prevent uglyness
2795                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2796                 // Calculate the maximum amount of chars to get
2797                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2798                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2799                 $contents = $wgContLang->truncate( $contents, $maxLength );
2800                 // Remove possible unfinished links
2801                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2802                 // Now replace the '$1' placeholder
2803                 $reason = str_replace( '$1', $contents, $reason );
2804
2805                 return $reason;
2806         }
2807
2808
2809         /*
2810          * UI entry point for page deletion
2811          */
2812         public function delete() {
2813                 global $wgUser, $wgOut, $wgRequest;
2814
2815                 $confirm = $wgRequest->wasPosted() &&
2816                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2817
2818                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2819                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2820
2821                 $reason = $this->DeleteReasonList;
2822
2823                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2824                         // Entry from drop down menu + additional comment
2825                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2826                 } elseif ( $reason == 'other' ) {
2827                         $reason = $this->DeleteReason;
2828                 }
2829
2830                 # Flag to hide all contents of the archived revisions
2831                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2832
2833                 # This code desperately needs to be totally rewritten
2834
2835                 # Read-only check...
2836                 if ( wfReadOnly() ) {
2837                         $wgOut->readOnlyPage();
2838
2839                         return;
2840                 }
2841
2842                 # Check permissions
2843                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2844
2845                 if ( count( $permission_errors ) > 0 ) {
2846                         $wgOut->showPermissionsErrorPage( $permission_errors );
2847
2848                         return;
2849                 }
2850
2851                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2852
2853                 # Better double-check that it hasn't been deleted yet!
2854                 $dbw = wfGetDB( DB_MASTER );
2855                 $conds = $this->mTitle->pageCond();
2856                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2857                 if ( $latest === false ) {
2858                         $wgOut->showFatalError(
2859                                 Html::rawElement(
2860                                         'div',
2861                                         array( 'class' => 'error mw-error-cannotdelete' ),
2862                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2863                                 )
2864                         );
2865                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2866                         LogEventsList::showLogExtract(
2867                                 $wgOut,
2868                                 'delete',
2869                                 $this->mTitle->getPrefixedText()
2870                         );
2871
2872                         return;
2873                 }
2874
2875                 # Hack for big sites
2876                 $bigHistory = $this->isBigDeletion();
2877                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2878                         global $wgLang, $wgDeleteRevisionsLimit;
2879
2880                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2881                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2882
2883                         return;
2884                 }
2885
2886                 if ( $confirm ) {
2887                         $this->doDelete( $reason, $suppress );
2888
2889                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2890                                 $this->doWatch();
2891                         } elseif ( $this->mTitle->userIsWatching() ) {
2892                                 $this->doUnwatch();
2893                         }
2894
2895                         return;
2896                 }
2897
2898                 // Generate deletion reason
2899                 $hasHistory = false;
2900                 if ( !$reason ) {
2901                         $reason = $this->generateReason( $hasHistory );
2902                 }
2903
2904                 // If the page has a history, insert a warning
2905                 if ( $hasHistory && !$confirm ) {
2906                         global $wgLang;
2907
2908                         $skin = $wgUser->getSkin();
2909                         $revisions = $this->estimateRevisionCount();
2910                         //FIXME: lego
2911                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2912                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2913                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2914                                 '</strong>'
2915                         );
2916
2917                         if ( $bigHistory ) {
2918                                 global $wgDeleteRevisionsLimit;
2919                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2920                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2921                         }
2922                 }
2923
2924                 return $this->confirmDelete( $reason );
2925         }
2926
2927         /**
2928          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2929          */
2930         public function isBigDeletion() {
2931                 global $wgDeleteRevisionsLimit;
2932
2933                 if ( $wgDeleteRevisionsLimit ) {
2934                         $revCount = $this->estimateRevisionCount();
2935
2936                         return $revCount > $wgDeleteRevisionsLimit;
2937                 }
2938
2939                 return false;
2940         }
2941
2942         /**
2943          * @return int approximate revision count
2944          */
2945         public function estimateRevisionCount() {
2946                 $dbr = wfGetDB( DB_SLAVE );
2947
2948                 // For an exact count...
2949                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2950                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2951                 return $dbr->estimateRowCount( 'revision', '*',
2952                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2953         }
2954
2955         /**
2956          * Get the last N authors
2957          * @param $num Integer: number of revisions to get
2958          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2959          * @return array Array of authors, duplicates not removed
2960          */
2961         public function getLastNAuthors( $num, $revLatest = 0 ) {
2962                 wfProfileIn( __METHOD__ );
2963                 // First try the slave
2964                 // If that doesn't have the latest revision, try the master
2965                 $continue = 2;
2966                 $db = wfGetDB( DB_SLAVE );
2967
2968                 do {
2969                         $res = $db->select( array( 'page', 'revision' ),
2970                                 array( 'rev_id', 'rev_user_text' ),
2971                                 array(
2972                                         'page_namespace' => $this->mTitle->getNamespace(),
2973                                         'page_title' => $this->mTitle->getDBkey(),
2974                                         'rev_page = page_id'
2975                                 ), __METHOD__, $this->getSelectOptions( array(
2976                                         'ORDER BY' => 'rev_timestamp DESC',
2977                                         'LIMIT' => $num
2978                                 ) )
2979                         );
2980
2981                         if ( !$res ) {
2982                                 wfProfileOut( __METHOD__ );
2983                                 return array();
2984                         }
2985
2986                         $row = $db->fetchObject( $res );
2987
2988                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2989                                 $db = wfGetDB( DB_MASTER );
2990                                 $continue--;
2991                         } else {
2992                                 $continue = 0;
2993                         }
2994                 } while ( $continue );
2995
2996                 $authors = array( $row->rev_user_text );
2997
2998                 foreach ( $res as $row ) {
2999                         $authors[] = $row->rev_user_text;
3000                 }
3001
3002                 wfProfileOut( __METHOD__ );
3003                 return $authors;
3004         }
3005
3006         /**
3007          * Output deletion confirmation dialog
3008          * FIXME: Move to another file?
3009          * @param $reason String: prefilled reason
3010          */
3011         public function confirmDelete( $reason ) {
3012                 global $wgOut, $wgUser;
3013
3014                 wfDebug( "Article::confirmDelete\n" );
3015
3016                 $deleteBackLink = $wgUser->getSkin()->linkKnown( $this->mTitle );
3017                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
3018                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3019                 $wgOut->addWikiMsg( 'confirmdeletetext' );
3020
3021                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
3022
3023                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
3024                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
3025                                         <td></td>
3026                                         <td class='mw-input'><strong>" .
3027                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
3028                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
3029                                         "</strong></td>
3030                                 </tr>";
3031                 } else {
3032                         $suppress = '';
3033                 }
3034                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3035
3036                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3037                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3038                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3039                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3040                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3041                         "<tr id=\"wpDeleteReasonListRow\">
3042                                 <td class='mw-label'>" .
3043                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3044                                 "</td>
3045                                 <td class='mw-input'>" .
3046                                         Xml::listDropDown( 'wpDeleteReasonList',
3047                                                 wfMsgForContent( 'deletereason-dropdown' ),
3048                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3049                                 "</td>
3050                         </tr>
3051                         <tr id=\"wpDeleteReasonRow\">
3052                                 <td class='mw-label'>" .
3053                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3054                                 "</td>
3055                                 <td class='mw-input'>" .
3056                                 Html::input( 'wpReason', $reason, 'text', array(
3057                                         'size' => '60',
3058                                         'maxlength' => '255',
3059                                         'tabindex' => '2',
3060                                         'id' => 'wpReason',
3061                                         'autofocus'
3062                                 ) ) .
3063                                 "</td>
3064                         </tr>";
3065
3066                 # Disallow watching if user is not logged in
3067                 if ( $wgUser->isLoggedIn() ) {
3068                         $form .= "
3069                         <tr>
3070                                 <td></td>
3071                                 <td class='mw-input'>" .
3072                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3073                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3074                                 "</td>
3075                         </tr>";
3076                 }
3077
3078                 $form .= "
3079                         $suppress
3080                         <tr>
3081                                 <td></td>
3082                                 <td class='mw-submit'>" .
3083                                         Xml::submitButton( wfMsg( 'deletepage' ),
3084                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3085                                 "</td>
3086                         </tr>" .
3087                         Xml::closeElement( 'table' ) .
3088                         Xml::closeElement( 'fieldset' ) .
3089                         Html::hidden( 'wpEditToken', $wgUser->editToken() ) .
3090                         Xml::closeElement( 'form' );
3091
3092                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
3093                                 $skin = $wgUser->getSkin();
3094                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3095                                 $link = $skin->link(
3096                                         $title,
3097                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3098                                         array(),
3099                                         array( 'action' => 'edit' )
3100                                 );
3101                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3102                         }
3103
3104                 $wgOut->addHTML( $form );
3105                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3106                 LogEventsList::showLogExtract( $wgOut, 'delete',
3107                         $this->mTitle->getPrefixedText()
3108                 );
3109         }
3110
3111         /**
3112          * Perform a deletion and output success or failure messages
3113          */
3114         public function doDelete( $reason, $suppress = false ) {
3115                 global $wgOut, $wgUser;
3116
3117                 $id = $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3118
3119                 $error = '';
3120                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3121                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
3122                                 $deleted = $this->mTitle->getPrefixedText();
3123
3124                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3125                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3126
3127                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3128
3129                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3130                                 $wgOut->returnToMain( false );
3131                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3132                         }
3133                 } else {
3134                         if ( $error == '' ) {
3135                                 $wgOut->showFatalError(
3136                                         Html::rawElement(
3137                                                 'div',
3138                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3139                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3140                                         )
3141                                 );
3142
3143                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3144
3145                                 LogEventsList::showLogExtract(
3146                                         $wgOut,
3147                                         'delete',
3148                                         $this->mTitle->getPrefixedText()
3149                                 );
3150                         } else {
3151                                 $wgOut->showFatalError( $error );
3152                         }
3153                 }
3154         }
3155
3156         /**
3157          * Back-end article deletion
3158          * Deletes the article with database consistency, writes logs, purges caches
3159          *
3160          * @param $reason string delete reason for deletion log
3161          * @param suppress bitfield
3162          *      Revision::DELETED_TEXT
3163          *      Revision::DELETED_COMMENT
3164          *      Revision::DELETED_USER
3165          *      Revision::DELETED_RESTRICTED
3166          * @param $id int article ID
3167          * @param $commit boolean defaults to true, triggers transaction end
3168          * @return boolean true if successful
3169          */
3170         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
3171                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3172
3173                 wfDebug( __METHOD__ . "\n" );
3174
3175                 $dbw = wfGetDB( DB_MASTER );
3176                 $t = $this->mTitle->getDBkey();
3177                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3178
3179                 if ( $t === '' || $id == 0 ) {
3180                         return false;
3181                 }
3182
3183                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3184                 array_push( $wgDeferredUpdateList, $u );
3185
3186                 // Bitfields to further suppress the content
3187                 if ( $suppress ) {
3188                         $bitfield = 0;
3189                         // This should be 15...
3190                         $bitfield |= Revision::DELETED_TEXT;
3191                         $bitfield |= Revision::DELETED_COMMENT;
3192                         $bitfield |= Revision::DELETED_USER;
3193                         $bitfield |= Revision::DELETED_RESTRICTED;
3194                 } else {
3195                         $bitfield = 'rev_deleted';
3196                 }
3197
3198                 $dbw->begin();
3199                 // For now, shunt the revision data into the archive table.
3200                 // Text is *not* removed from the text table; bulk storage
3201                 // is left intact to avoid breaking block-compression or
3202                 // immutable storage schemes.
3203                 //
3204                 // For backwards compatibility, note that some older archive
3205                 // table entries will have ar_text and ar_flags fields still.
3206                 //
3207                 // In the future, we may keep revisions and mark them with
3208                 // the rev_deleted field, which is reserved for this purpose.
3209                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3210                         array(
3211                                 'ar_namespace'  => 'page_namespace',
3212                                 'ar_title'      => 'page_title',
3213                                 'ar_comment'    => 'rev_comment',
3214                                 'ar_user'       => 'rev_user',
3215                                 'ar_user_text'  => 'rev_user_text',
3216                                 'ar_timestamp'  => 'rev_timestamp',
3217                                 'ar_minor_edit' => 'rev_minor_edit',
3218                                 'ar_rev_id'     => 'rev_id',
3219                                 'ar_text_id'    => 'rev_text_id',
3220                                 'ar_text'       => '\'\'', // Be explicit to appease
3221                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3222                                 'ar_len'        => 'rev_len',
3223                                 'ar_page_id'    => 'page_id',
3224                                 'ar_deleted'    => $bitfield
3225                         ), array(
3226                                 'page_id' => $id,
3227                                 'page_id = rev_page'
3228                         ), __METHOD__
3229                 );
3230
3231                 # Delete restrictions for it
3232                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3233
3234                 # Now that it's safely backed up, delete it
3235                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3236                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3237
3238                 if ( !$ok ) {
3239                         $dbw->rollback();
3240                         return false;
3241                 }
3242
3243                 # Fix category table counts
3244                 $cats = array();
3245                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3246
3247                 foreach ( $res as $row ) {
3248                         $cats [] = $row->cl_to;
3249                 }
3250
3251                 $this->updateCategoryCounts( array(), $cats );
3252
3253                 # If using cascading deletes, we can skip some explicit deletes
3254                 if ( !$dbw->cascadingDeletes() ) {
3255                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3256
3257                         if ( $wgUseTrackbacks )
3258                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3259
3260                         # Delete outgoing links
3261                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3262                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3263                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3264                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3265                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3266                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3267                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3268                 }
3269
3270                 # If using cleanup triggers, we can skip some manual deletes
3271                 if ( !$dbw->cleanupTriggers() ) {
3272                         # Clean up recentchanges entries...
3273                         $dbw->delete( 'recentchanges',
3274                                 array( 'rc_type != ' . RC_LOG,
3275                                         'rc_namespace' => $this->mTitle->getNamespace(),
3276                                         'rc_title' => $this->mTitle->getDBkey() ),
3277                                 __METHOD__ );
3278                         $dbw->delete( 'recentchanges',
3279                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3280                                 __METHOD__ );
3281                 }
3282
3283                 # Clear caches
3284                 Article::onArticleDelete( $this->mTitle );
3285
3286                 # Clear the cached article id so the interface doesn't act like we exist
3287                 $this->mTitle->resetArticleID( 0 );
3288
3289                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3290                 $logtype = $suppress ? 'suppress' : 'delete';
3291                 $log = new LogPage( $logtype );
3292
3293                 # Make sure logging got through
3294                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3295
3296                 if ( $commit ) {
3297                         $dbw->commit();
3298                 }
3299
3300                 return true;
3301         }
3302
3303         /**
3304          * Roll back the most recent consecutive set of edits to a page
3305          * from the same user; fails if there are no eligible edits to
3306          * roll back to, e.g. user is the sole contributor. This function
3307          * performs permissions checks on $wgUser, then calls commitRollback()
3308          * to do the dirty work
3309          *
3310          * @param $fromP String: Name of the user whose edits to rollback.
3311          * @param $summary String: Custom summary. Set to default summary if empty.
3312          * @param $token String: Rollback token.
3313          * @param $bot Boolean: If true, mark all reverted edits as bot.
3314          *
3315          * @param $resultDetails Array: contains result-specific array of additional values
3316          *    'alreadyrolled' : 'current' (rev)
3317          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3318          *
3319          * @return array of errors, each error formatted as
3320          *   array(messagekey, param1, param2, ...).
3321          * On success, the array is empty.  This array can also be passed to
3322          * OutputPage::showPermissionsErrorPage().
3323          */
3324         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3325                 global $wgUser;
3326
3327                 $resultDetails = null;
3328
3329                 # Check permissions
3330                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3331                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3332                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3333
3334                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3335                         $errors[] = array( 'sessionfailure' );
3336                 }
3337
3338                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3339                         $errors[] = array( 'actionthrottledtext' );
3340                 }
3341
3342                 # If there were errors, bail out now
3343                 if ( !empty( $errors ) ) {
3344                         return $errors;
3345                 }
3346
3347                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3348         }
3349
3350         /**
3351          * Backend implementation of doRollback(), please refer there for parameter
3352          * and return value documentation
3353          *
3354          * NOTE: This function does NOT check ANY permissions, it just commits the
3355          * rollback to the DB Therefore, you should only call this function direct-
3356          * ly if you want to use custom permissions checks. If you don't, use
3357          * doRollback() instead.
3358          */
3359         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3360                 global $wgUseRCPatrol, $wgUser, $wgLang;
3361
3362                 $dbw = wfGetDB( DB_MASTER );
3363
3364                 if ( wfReadOnly() ) {
3365                         return array( array( 'readonlytext' ) );
3366                 }
3367
3368                 # Get the last editor
3369                 $current = Revision::newFromTitle( $this->mTitle );
3370                 if ( is_null( $current ) ) {
3371                         # Something wrong... no page?
3372                         return array( array( 'notanarticle' ) );
3373                 }
3374
3375                 $from = str_replace( '_', ' ', $fromP );
3376                 # User name given should match up with the top revision.
3377                 # If the user was deleted then $from should be empty.
3378                 if ( $from != $current->getUserText() ) {
3379                         $resultDetails = array( 'current' => $current );
3380                         return array( array( 'alreadyrolled',
3381                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3382                                 htmlspecialchars( $fromP ),
3383                                 htmlspecialchars( $current->getUserText() )
3384                         ) );
3385                 }
3386
3387                 # Get the last edit not by this guy...
3388                 # Note: these may not be public values
3389                 $user = intval( $current->getRawUser() );
3390                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3391                 $s = $dbw->selectRow( 'revision',
3392                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3393                         array( 'rev_page' => $current->getPage(),
3394                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3395                         ), __METHOD__,
3396                         array( 'USE INDEX' => 'page_timestamp',
3397                                 'ORDER BY' => 'rev_timestamp DESC' )
3398                         );
3399                 if ( $s === false ) {
3400                         # No one else ever edited this page
3401                         return array( array( 'cantrollback' ) );
3402                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3403                         # Only admins can see this text
3404                         return array( array( 'notvisiblerev' ) );
3405                 }
3406
3407                 $set = array();
3408                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3409                         # Mark all reverted edits as bot
3410                         $set['rc_bot'] = 1;
3411                 }
3412
3413                 if ( $wgUseRCPatrol ) {
3414                         # Mark all reverted edits as patrolled
3415                         $set['rc_patrolled'] = 1;
3416                 }
3417
3418                 if ( count( $set ) ) {
3419                         $dbw->update( 'recentchanges', $set,
3420                                 array( /* WHERE */
3421                                         'rc_cur_id' => $current->getPage(),
3422                                         'rc_user_text' => $current->getUserText(),
3423                                         "rc_timestamp > '{$s->rev_timestamp}'",
3424                                 ), __METHOD__
3425                         );
3426                 }
3427
3428                 # Generate the edit summary if necessary
3429                 $target = Revision::newFromId( $s->rev_id );
3430                 if ( empty( $summary ) ) {
3431                         if ( $from == '' ) { // no public user name
3432                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3433                         } else {
3434                                 $summary = wfMsgForContent( 'revertpage' );
3435                         }
3436                 }
3437
3438                 # Allow the custom summary to use the same args as the default message
3439                 $args = array(
3440                         $target->getUserText(), $from, $s->rev_id,
3441                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3442                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3443                 );
3444                 $summary = wfMsgReplaceArgs( $summary, $args );
3445
3446                 # Save
3447                 $flags = EDIT_UPDATE;
3448
3449                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3450                         $flags |= EDIT_MINOR;
3451                 }
3452
3453                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) ) {
3454                         $flags |= EDIT_FORCE_BOT;
3455                 }
3456
3457                 # Actually store the edit
3458                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3459                 if ( !empty( $status->value['revision'] ) ) {
3460                         $revId = $status->value['revision']->getId();
3461                 } else {
3462                         $revId = false;
3463                 }
3464
3465                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3466
3467                 $resultDetails = array(
3468                         'summary' => $summary,
3469                         'current' => $current,
3470                         'target'  => $target,
3471                         'newid'   => $revId
3472                 );
3473
3474                 return array();
3475         }
3476
3477         /**
3478          * User interface for rollback operations
3479          */
3480         public function rollback() {
3481                 global $wgUser, $wgOut, $wgRequest;
3482
3483                 $details = null;
3484
3485                 $result = $this->doRollback(
3486                         $wgRequest->getVal( 'from' ),
3487                         $wgRequest->getText( 'summary' ),
3488                         $wgRequest->getVal( 'token' ),
3489                         $wgRequest->getBool( 'bot' ),
3490                         $details
3491                 );
3492
3493                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3494                         $wgOut->rateLimited();
3495                         return;
3496                 }
3497
3498                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3499                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3500                         $errArray = $result[0];
3501                         $errMsg = array_shift( $errArray );
3502                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3503
3504                         if ( isset( $details['current'] ) ) {
3505                                 $current = $details['current'];
3506
3507                                 if ( $current->getComment() != '' ) {
3508                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3509                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3510                                 }
3511                         }
3512
3513                         return;
3514                 }
3515
3516                 # Display permissions errors before read-only message -- there's no
3517                 # point in misleading the user into thinking the inability to rollback
3518                 # is only temporary.
3519                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3520                         # array_diff is completely broken for arrays of arrays, sigh.
3521                         # Remove any 'readonlytext' error manually.
3522                         $out = array();
3523                         foreach ( $result as $error ) {
3524                                 if ( $error != array( 'readonlytext' ) ) {
3525                                         $out [] = $error;
3526                                 }
3527                         }
3528                         $wgOut->showPermissionsErrorPage( $out );
3529
3530                         return;
3531                 }
3532
3533                 if ( $result == array( array( 'readonlytext' ) ) ) {
3534                         $wgOut->readOnlyPage();
3535
3536                         return;
3537                 }
3538
3539                 $current = $details['current'];
3540                 $target = $details['target'];
3541                 $newId = $details['newid'];
3542                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3543                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3544
3545                 if ( $current->getUserText() === '' ) {
3546                         $old = wfMsg( 'rev-deleted-user' );
3547                 } else {
3548                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3549                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3550                 }
3551
3552                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3553                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3554                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3555                 $wgOut->returnToMain( false, $this->mTitle );
3556
3557                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3558                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3559                         $de->showDiff( '', '' );
3560                 }
3561         }
3562
3563         /**
3564          * Do standard deferred updates after page view
3565          */
3566         public function viewUpdates() {
3567                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3568                 if ( wfReadOnly() ) {
3569                         return;
3570                 }
3571
3572                 # Don't update page view counters on views from bot users (bug 14044)
3573                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3574                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
3575                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
3576                 }
3577
3578                 # Update newtalk / watchlist notification status
3579                 $wgUser->clearNotification( $this->mTitle );
3580         }
3581
3582         /**
3583          * Prepare text which is about to be saved.
3584          * Returns a stdclass with source, pst and output members
3585          */
3586         public function prepareTextForEdit( $text, $revid = null ) {
3587                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3588                         // Already prepared
3589                         return $this->mPreparedEdit;
3590                 }
3591
3592                 global $wgParser;
3593
3594                 $edit = (object)array();
3595                 $edit->revid = $revid;
3596                 $edit->newText = $text;
3597                 $edit->pst = $this->preSaveTransform( $text );
3598                 $edit->popts = $this->getParserOptions( true );
3599                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3600                 $edit->oldText = $this->getContent();
3601
3602                 $this->mPreparedEdit = $edit;
3603
3604                 return $edit;
3605         }
3606
3607         /**
3608          * Do standard deferred updates after page edit.
3609          * Update links tables, site stats, search index and message cache.
3610          * Purges pages that include this page if the text was changed here.
3611          * Every 100th edit, prune the recent changes table.
3612          *
3613          * @private
3614          * @param $text String: New text of the article
3615          * @param $summary String: Edit summary
3616          * @param $minoredit Boolean: Minor edit
3617          * @param $timestamp_of_pagechange Timestamp associated with the page change
3618          * @param $newid Integer: rev_id value of the new revision
3619          * @param $changed Boolean: Whether or not the content actually changed
3620          */
3621         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3622                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3623
3624                 wfProfileIn( __METHOD__ );
3625
3626                 # Parse the text
3627                 # Be careful not to double-PST: $text is usually already PST-ed once
3628                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3629                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3630                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3631                 } else {
3632                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3633                         $editInfo = $this->mPreparedEdit;
3634                 }
3635
3636                 # Save it to the parser cache
3637                 if ( $wgEnableParserCache ) {
3638                         $parserCache = ParserCache::singleton();
3639                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3640                 }
3641
3642                 # Update the links tables
3643                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3644                 $u->doUpdate();
3645
3646                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3647
3648                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3649                         if ( 0 == mt_rand( 0, 99 ) ) {
3650                                 // Flush old entries from the `recentchanges` table; we do this on
3651                                 // random requests so as to avoid an increase in writes for no good reason
3652                                 global $wgRCMaxAge;
3653
3654                                 $dbw = wfGetDB( DB_MASTER );
3655                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3656                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3657                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3658
3659                                 $dbw->query( $sql );
3660                         }
3661                 }
3662
3663                 $id = $this->getID();
3664                 $title = $this->mTitle->getPrefixedDBkey();
3665                 $shortTitle = $this->mTitle->getDBkey();
3666
3667                 if ( 0 == $id ) {
3668                         wfProfileOut( __METHOD__ );
3669                         return;
3670                 }
3671
3672                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3673                 array_push( $wgDeferredUpdateList, $u );
3674                 $u = new SearchUpdate( $id, $title, $text );
3675                 array_push( $wgDeferredUpdateList, $u );
3676
3677                 # If this is another user's talk page, update newtalk
3678                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3679                 # load of user talk pages and piss people off, nor if it's a minor edit
3680                 # by a properly-flagged bot.
3681                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3682                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3683                 ) {
3684                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3685                                 $other = User::newFromName( $shortTitle, false );
3686                                 if ( !$other ) {
3687                                         wfDebug( __METHOD__ . ": invalid username\n" );
3688                                 } elseif ( User::isIP( $shortTitle ) ) {
3689                                         // An anonymous user
3690                                         $other->setNewtalk( true );
3691                                 } elseif ( $other->isLoggedIn() ) {
3692                                         $other->setNewtalk( true );
3693                                 } else {
3694                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3695                                 }
3696                         }
3697                 }
3698
3699                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3700                         $wgMessageCache->replace( $shortTitle, $text );
3701                 }
3702
3703                 wfProfileOut( __METHOD__ );
3704         }
3705
3706         /**
3707          * Perform article updates on a special page creation.
3708          *
3709          * @param $rev Revision object
3710          *
3711          * @todo This is a shitty interface function. Kill it and replace the
3712          * other shitty functions like editUpdates and such so it's not needed
3713          * anymore.
3714          */
3715         public function createUpdates( $rev ) {
3716                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3717                 $this->mTotalAdjustment = 1;
3718                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3719                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3720         }
3721
3722         /**
3723          * Generate the navigation links when browsing through an article revisions
3724          * It shows the information as:
3725          *   Revision as of \<date\>; view current revision
3726          *   \<- Previous version | Next Version -\>
3727          *
3728          * @param $oldid String: revision ID of this article revision
3729          */
3730         public function setOldSubtitle( $oldid = 0 ) {
3731                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3732
3733                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3734                         return;
3735                 }
3736
3737                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3738
3739                 # Cascade unhide param in links for easy deletion browsing
3740                 $extraParams = array();
3741                 if ( $wgRequest->getVal( 'unhide' ) ) {
3742                         $extraParams['unhide'] = 1;
3743                 }
3744
3745                 $revision = Revision::newFromId( $oldid );
3746
3747                 $current = ( $oldid == $this->mLatest );
3748                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3749                 $tddate = $wgLang->date( $this->mTimestamp, true );
3750                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3751                 $sk = $wgUser->getSkin();
3752                 $lnk = $current
3753                         ? wfMsgHtml( 'currentrevisionlink' )
3754                         : $sk->link(
3755                                 $this->mTitle,
3756                                 wfMsgHtml( 'currentrevisionlink' ),
3757                                 array(),
3758                                 $extraParams,
3759                                 array( 'known', 'noclasses' )
3760                         );
3761                 $curdiff = $current
3762                         ? wfMsgHtml( 'diff' )
3763                         : $sk->link(
3764                                 $this->mTitle,
3765                                 wfMsgHtml( 'diff' ),
3766                                 array(),
3767                                 array(
3768                                         'diff' => 'cur',
3769                                         'oldid' => $oldid
3770                                 ) + $extraParams,
3771                                 array( 'known', 'noclasses' )
3772                         );
3773                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3774                 $prevlink = $prev
3775                         ? $sk->link(
3776                                 $this->mTitle,
3777                                 wfMsgHtml( 'previousrevision' ),
3778                                 array(),
3779                                 array(
3780                                         'direction' => 'prev',
3781                                         'oldid' => $oldid
3782                                 ) + $extraParams,
3783                                 array( 'known', 'noclasses' )
3784                         )
3785                         : wfMsgHtml( 'previousrevision' );
3786                 $prevdiff = $prev
3787                         ? $sk->link(
3788                                 $this->mTitle,
3789                                 wfMsgHtml( 'diff' ),
3790                                 array(),
3791                                 array(
3792                                         'diff' => 'prev',
3793                                         'oldid' => $oldid
3794                                 ) + $extraParams,
3795                                 array( 'known', 'noclasses' )
3796                         )
3797                         : wfMsgHtml( 'diff' );
3798                 $nextlink = $current
3799                         ? wfMsgHtml( 'nextrevision' )
3800                         : $sk->link(
3801                                 $this->mTitle,
3802                                 wfMsgHtml( 'nextrevision' ),
3803                                 array(),
3804                                 array(
3805                                         'direction' => 'next',
3806                                         'oldid' => $oldid
3807                                 ) + $extraParams,
3808                                 array( 'known', 'noclasses' )
3809                         );
3810                 $nextdiff = $current
3811                         ? wfMsgHtml( 'diff' )
3812                         : $sk->link(
3813                                 $this->mTitle,
3814                                 wfMsgHtml( 'diff' ),
3815                                 array(),
3816                                 array(
3817                                         'diff' => 'next',
3818                                         'oldid' => $oldid
3819                                 ) + $extraParams,
3820                                 array( 'known', 'noclasses' )
3821                         );
3822
3823                 $cdel = '';
3824
3825                 // User can delete revisions or view deleted revisions...
3826                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3827                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3828                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3829                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3830                         } else {
3831                                 $query = array(
3832                                         'type'   => 'revision',
3833                                         'target' => $this->mTitle->getPrefixedDbkey(),
3834                                         'ids'    => $oldid
3835                                 );
3836                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3837                         }
3838                         $cdel .= ' ';
3839                 }
3840
3841                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3842                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3843
3844                 $m = wfMsg( 'revision-info-current' );
3845                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3846                         ? 'revision-info-current'
3847                         : 'revision-info';
3848
3849                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3850                         wfMsgExt(
3851                                 $infomsg,
3852                                 array( 'parseinline', 'replaceafter' ),
3853                                 $td,
3854                                 $userlinks,
3855                                 $revision->getID(),
3856                                 $tddate,
3857                                 $tdtime,
3858                                 $revision->getUser()
3859                         ) .
3860                         "</div>\n" .
3861                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3862                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3863
3864                 $wgOut->setSubtitle( $r );
3865         }
3866
3867         /**
3868          * This function is called right before saving the wikitext,
3869          * so we can do things like signatures and links-in-context.
3870          *
3871          * @param $text String article contents
3872          * @return string article contents with altered wikitext markup (signatures
3873          *      converted, {{subst:}}, templates, etc.)
3874          */
3875         public function preSaveTransform( $text ) {
3876                 global $wgParser, $wgUser;
3877
3878                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3879         }
3880
3881         /* Caching functions */
3882
3883         /**
3884          * checkLastModified returns true if it has taken care of all
3885          * output to the client that is necessary for this request.
3886          * (that is, it has sent a cached version of the page)
3887          *
3888          * @return boolean true if cached version send, false otherwise
3889          */
3890         protected function tryFileCache() {
3891                 static $called = false;
3892
3893                 if ( $called ) {
3894                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3895                         return false;
3896                 }
3897
3898                 $called = true;
3899                 if ( $this->isFileCacheable() ) {
3900                         $cache = new HTMLFileCache( $this->mTitle );
3901                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3902                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3903                                 $cache->loadFromFileCache();
3904                                 return true;
3905                         } else {
3906                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3907                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3908                         }
3909                 } else {
3910                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3911                 }
3912
3913                 return false;
3914         }
3915
3916         /**
3917          * Check if the page can be cached
3918          * @return bool
3919          */
3920         public function isFileCacheable() {
3921                 $cacheable = false;
3922
3923                 if ( HTMLFileCache::useFileCache() ) {
3924                         $cacheable = $this->getID() && !$this->mRedirectedFrom && !$this->mTitle->isRedirect();
3925                         // Extension may have reason to disable file caching on some pages.
3926                         if ( $cacheable ) {
3927                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3928                         }
3929                 }
3930
3931                 return $cacheable;
3932         }
3933
3934         /**
3935          * Loads page_touched and returns a value indicating if it should be used
3936          * @return boolean true if not a redirect
3937          */
3938         public function checkTouched() {
3939                 if ( !$this->mDataLoaded ) {
3940                         $this->loadPageData();
3941                 }
3942
3943                 return !$this->mIsRedirect;
3944         }
3945
3946         /**
3947          * Get the page_touched field
3948          * @return string containing GMT timestamp
3949          */
3950         public function getTouched() {
3951                 if ( !$this->mDataLoaded ) {
3952                         $this->loadPageData();
3953                 }
3954
3955                 return $this->mTouched;
3956         }
3957
3958         /**
3959          * Get the page_latest field
3960          * @return integer rev_id of current revision
3961          */
3962         public function getLatest() {
3963                 if ( !$this->mDataLoaded ) {
3964                         $this->loadPageData();
3965                 }
3966
3967                 return (int)$this->mLatest;
3968         }
3969
3970         /**
3971          * Edit an article without doing all that other stuff
3972          * The article must already exist; link tables etc
3973          * are not updated, caches are not flushed.
3974          *
3975          * @param $text String: text submitted
3976          * @param $comment String: comment submitted
3977          * @param $minor Boolean: whereas it's a minor modification
3978          */
3979         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3980                 wfProfileIn( __METHOD__ );
3981
3982                 $dbw = wfGetDB( DB_MASTER );
3983                 $revision = new Revision( array(
3984                         'page'       => $this->getId(),
3985                         'text'       => $text,
3986                         'comment'    => $comment,
3987                         'minor_edit' => $minor ? 1 : 0,
3988                         ) );
3989                 $revision->insertOn( $dbw );
3990                 $this->updateRevisionOn( $dbw, $revision );
3991
3992                 global $wgUser;
3993                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3994
3995                 wfProfileOut( __METHOD__ );
3996         }
3997
3998         /**#@+
3999          * The onArticle*() functions are supposed to be a kind of hooks
4000          * which should be called whenever any of the specified actions
4001          * are done.
4002          *
4003          * This is a good place to put code to clear caches, for instance.
4004          *
4005          * This is called on page move and undelete, as well as edit
4006          *
4007          * @param $title a title object
4008          */
4009         public static function onArticleCreate( $title ) {
4010                 # Update existence markers on article/talk tabs...
4011                 if ( $title->isTalkPage() ) {
4012                         $other = $title->getSubjectPage();
4013                 } else {
4014                         $other = $title->getTalkPage();
4015                 }
4016
4017                 $other->invalidateCache();
4018                 $other->purgeSquid();
4019
4020                 $title->touchLinks();
4021                 $title->purgeSquid();
4022                 $title->deleteTitleProtection();
4023         }
4024
4025         /**
4026          * Clears caches when article is deleted
4027          */
4028         public static function onArticleDelete( $title ) {
4029                 global $wgMessageCache;
4030
4031                 # Update existence markers on article/talk tabs...
4032                 if ( $title->isTalkPage() ) {
4033                         $other = $title->getSubjectPage();
4034                 } else {
4035                         $other = $title->getTalkPage();
4036                 }
4037
4038                 $other->invalidateCache();
4039                 $other->purgeSquid();
4040
4041                 $title->touchLinks();
4042                 $title->purgeSquid();
4043
4044                 # File cache
4045                 HTMLFileCache::clearFileCache( $title );
4046
4047                 # Messages
4048                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4049                         $wgMessageCache->replace( $title->getDBkey(), false );
4050                 }
4051
4052                 # Images
4053                 if ( $title->getNamespace() == NS_FILE ) {
4054                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4055                         $update->doUpdate();
4056                 }
4057
4058                 # User talk pages
4059                 if ( $title->getNamespace() == NS_USER_TALK ) {
4060                         $user = User::newFromName( $title->getText(), false );
4061                         $user->setNewtalk( false );
4062                 }
4063
4064                 # Image redirects
4065                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4066         }
4067
4068         /**
4069          * Purge caches on page update etc
4070          *
4071          * @param $title Title object
4072          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4073          */
4074         public static function onArticleEdit( $title ) {
4075                 global $wgDeferredUpdateList;
4076
4077                 // Invalidate caches of articles which include this page
4078                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4079
4080                 // Invalidate the caches of all pages which redirect here
4081                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4082
4083                 # Purge squid for this page only
4084                 $title->purgeSquid();
4085
4086                 # Clear file cache for this page only
4087                 HTMLFileCache::clearFileCache( $title );
4088         }
4089
4090         /**#@-*/
4091
4092         /**
4093          * Overriden by ImagePage class, only present here to avoid a fatal error
4094          * Called for ?action=revert
4095          */
4096         public function revert() {
4097                 global $wgOut;
4098                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4099         }
4100
4101         /**
4102          * Info about this page
4103          * Called for ?action=info when $wgAllowPageInfo is on.
4104          */
4105         public function info() {
4106                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4107
4108                 if ( !$wgAllowPageInfo ) {
4109                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4110                         return;
4111                 }
4112
4113                 $page = $this->mTitle->getSubjectPage();
4114
4115                 $wgOut->setPagetitle( $page->getPrefixedText() );
4116                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4117                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4118
4119                 if ( !$this->mTitle->exists() ) {
4120                         $wgOut->addHTML( '<div class="noarticletext">' );
4121                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4122                                 // This doesn't quite make sense; the user is asking for
4123                                 // information about the _page_, not the message... -- RC
4124                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
4125                         } else {
4126                                 $msg = $wgUser->isLoggedIn()
4127                                         ? 'noarticletext'
4128                                         : 'noarticletextanon';
4129                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4130                         }
4131
4132                         $wgOut->addHTML( '</div>' );
4133                 } else {
4134                         $dbr = wfGetDB( DB_SLAVE );
4135                         $wl_clause = array(
4136                                 'wl_title'     => $page->getDBkey(),
4137                                 'wl_namespace' => $page->getNamespace() );
4138                         $numwatchers = $dbr->selectField(
4139                                 'watchlist',
4140                                 'COUNT(*)',
4141                                 $wl_clause,
4142                                 __METHOD__,
4143                                 $this->getSelectOptions() );
4144
4145                         $pageInfo = $this->pageCountInfo( $page );
4146                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4147
4148
4149                         //FIXME: unescaped messages
4150                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4151                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4152
4153                         if ( $talkInfo ) {
4154                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4155                         }
4156
4157                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4158
4159                         if ( $talkInfo ) {
4160                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4161                         }
4162
4163                         $wgOut->addHTML( '</ul>' );
4164                 }
4165         }
4166
4167         /**
4168          * Return the total number of edits and number of unique editors
4169          * on a given page. If page does not exist, returns false.
4170          *
4171          * @param $title Title object
4172          * @return mixed array or boolean false
4173          */
4174         public function pageCountInfo( $title ) {
4175                 $id = $title->getArticleId();
4176
4177                 if ( $id == 0 ) {
4178                         return false;
4179                 }
4180
4181                 $dbr = wfGetDB( DB_SLAVE );
4182                 $rev_clause = array( 'rev_page' => $id );
4183                 $edits = $dbr->selectField(
4184                         'revision',
4185                         'COUNT(rev_page)',
4186                         $rev_clause,
4187                         __METHOD__,
4188                         $this->getSelectOptions()
4189                 );
4190                 $authors = $dbr->selectField(
4191                         'revision',
4192                         'COUNT(DISTINCT rev_user_text)',
4193                         $rev_clause,
4194                         __METHOD__,
4195                         $this->getSelectOptions()
4196                 );
4197
4198                 return array( 'edits' => $edits, 'authors' => $authors );
4199         }
4200
4201         /**
4202          * Return a list of templates used by this article.
4203          * Uses the templatelinks table
4204          *
4205          * @return Array of Title objects
4206          */
4207         public function getUsedTemplates() {
4208                 $result = array();
4209                 $id = $this->mTitle->getArticleID();
4210
4211                 if ( $id == 0 ) {
4212                         return array();
4213                 }
4214
4215                 $dbr = wfGetDB( DB_SLAVE );
4216                 $res = $dbr->select( array( 'templatelinks' ),
4217                         array( 'tl_namespace', 'tl_title' ),
4218                         array( 'tl_from' => $id ),
4219                         __METHOD__ );
4220
4221                 if ( $res !== false ) {
4222                         foreach ( $res as $row ) {
4223                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4224                         }
4225                 }
4226
4227                 return $result;
4228         }
4229
4230         /**
4231          * Returns a list of hidden categories this page is a member of.
4232          * Uses the page_props and categorylinks tables.
4233          *
4234          * @return Array of Title objects
4235          */
4236         public function getHiddenCategories() {
4237                 $result = array();
4238                 $id = $this->mTitle->getArticleID();
4239
4240                 if ( $id == 0 ) {
4241                         return array();
4242                 }
4243
4244                 $dbr = wfGetDB( DB_SLAVE );
4245                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4246                         array( 'cl_to' ),
4247                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4248                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4249                         __METHOD__ );
4250
4251                 if ( $res !== false ) {
4252                         foreach ( $res as $row ) {
4253                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4254                         }
4255                 }
4256
4257                 return $result;
4258         }
4259
4260         /**
4261         * Return an applicable autosummary if one exists for the given edit.
4262         * @param $oldtext String: the previous text of the page.
4263         * @param $newtext String: The submitted text of the page.
4264         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4265         * @return string An appropriate autosummary, or an empty string.
4266         */
4267         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4268                 global $wgContLang;
4269
4270                 # Decide what kind of autosummary is needed.
4271
4272                 # Redirect autosummaries
4273                 $ot = Title::newFromRedirect( $oldtext );
4274                 $rt = Title::newFromRedirect( $newtext );
4275
4276                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4277                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4278                 }
4279
4280                 # New page autosummaries
4281                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4282                         # If they're making a new article, give its text, truncated, in the summary.
4283
4284                         $truncatedtext = $wgContLang->truncate(
4285                                 str_replace( "\n", ' ', $newtext ),
4286                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4287
4288                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4289                 }
4290
4291                 # Blanking autosummaries
4292                 if ( $oldtext != '' && $newtext == '' ) {
4293                         return wfMsgForContent( 'autosumm-blank' );
4294                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4295                         # Removing more than 90% of the article
4296
4297                         $truncatedtext = $wgContLang->truncate(
4298                                 $newtext,
4299                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4300
4301                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4302                 }
4303
4304                 # If we reach this point, there's no applicable autosummary for our case, so our
4305                 # autosummary is empty.
4306                 return '';
4307         }
4308
4309         /**
4310          * Add the primary page-view wikitext to the output buffer
4311          * Saves the text into the parser cache if possible.
4312          * Updates templatelinks if it is out of date.
4313          *
4314          * @param $text String
4315          * @param $cache Boolean
4316          * @param $parserOptions mixed ParserOptions object, or boolean false
4317          */
4318         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4319                 global $wgOut;
4320
4321                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4322                 $wgOut->addParserOutput( $this->mParserOutput );
4323         }
4324
4325         /**
4326          * This does all the heavy lifting for outputWikitext, except it returns the parser
4327          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4328          * say, embedding thread pages within a discussion system (LiquidThreads)
4329          *
4330          * @param $text string
4331          * @param $cache boolean
4332          * @param $parserOptions parsing options, defaults to false
4333          * @return string containing parsed output
4334          */
4335         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4336                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4337
4338                 if ( !$parserOptions ) {
4339                         $parserOptions = $this->getParserOptions();
4340                 }
4341
4342                 $time = - wfTime();
4343                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4344                         $parserOptions, true, true, $this->getRevIdFetched() );
4345                 $time += wfTime();
4346
4347                 # Timing hack
4348                 if ( $time > 3 ) {
4349                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4350                                 $this->mTitle->getPrefixedDBkey() ) );
4351                 }
4352
4353                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4354                         $parserCache = ParserCache::singleton();
4355                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4356                 }
4357
4358                 // Make sure file cache is not used on uncacheable content.
4359                 // Output that has magic words in it can still use the parser cache
4360                 // (if enabled), though it will generally expire sooner.
4361                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4362                         $wgUseFileCache = false;
4363                 }
4364
4365                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4366
4367                 return $this->mParserOutput;
4368         }
4369
4370         /**
4371          * Get parser options suitable for rendering the primary article wikitext
4372          * @param $canonical boolean Determines that the generated must not depend on user preferences (see bug 14404)
4373          * @return mixed ParserOptions object or boolean false
4374          */
4375         public function getParserOptions( $canonical = false ) {
4376                 global $wgUser, $wgLanguageCode;
4377
4378                 if ( !$this->mParserOptions || $canonical ) {
4379                         $user = !$canonical ? $wgUser : new User;
4380                         $parserOptions = new ParserOptions( $user );
4381                         $parserOptions->setTidy( true );
4382                         $parserOptions->enableLimitReport();
4383
4384                         if ( $canonical ) {
4385                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
4386                                 return $parserOptions;
4387                         }
4388                         $this->mParserOptions = $parserOptions;
4389                 }
4390
4391                 // Clone to allow modifications of the return value without affecting
4392                 // the cache
4393                 return clone $this->mParserOptions;
4394         }
4395
4396         /**
4397          * Updates cascading protections
4398          *
4399          * @param $parserOutput mixed ParserOptions object, or boolean false
4400          **/
4401         protected function doCascadeProtectionUpdates( $parserOutput ) {
4402                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4403                         return;
4404                 }
4405
4406                 // templatelinks table may have become out of sync,
4407                 // especially if using variable-based transclusions.
4408                 // For paranoia, check if things have changed and if
4409                 // so apply updates to the database. This will ensure
4410                 // that cascaded protections apply as soon as the changes
4411                 // are visible.
4412
4413                 # Get templates from templatelinks
4414                 $id = $this->mTitle->getArticleID();
4415
4416                 $tlTemplates = array();
4417
4418                 $dbr = wfGetDB( DB_SLAVE );
4419                 $res = $dbr->select( array( 'templatelinks' ),
4420                         array( 'tl_namespace', 'tl_title' ),
4421                         array( 'tl_from' => $id ),
4422                         __METHOD__
4423                 );
4424
4425                 foreach ( $res as $row ) {
4426                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4427                 }
4428
4429                 # Get templates from parser output.
4430                 $poTemplates = array();
4431                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4432                         foreach ( $templates as $dbk => $id ) {
4433                                 $poTemplates["$ns:$dbk"] = true;
4434                         }
4435                 }
4436
4437                 # Get the diff
4438                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4439
4440                 if ( count( $templates_diff ) > 0 ) {
4441                         # Whee, link updates time.
4442                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4443                         $u->doUpdate();
4444                 }
4445         }
4446
4447         /**
4448          * Update all the appropriate counts in the category table, given that
4449          * we've added the categories $added and deleted the categories $deleted.
4450          *
4451          * @param $added array   The names of categories that were added
4452          * @param $deleted array The names of categories that were deleted
4453          */
4454         public function updateCategoryCounts( $added, $deleted ) {
4455                 $ns = $this->mTitle->getNamespace();
4456                 $dbw = wfGetDB( DB_MASTER );
4457
4458                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4459                 # exist, we might legitimately not create it, but it's simpler to just
4460                 # create it and then give it a negative value, since the value is bogus
4461                 # anyway.
4462                 #
4463                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4464                 $insertCats = array_merge( $added, $deleted );
4465                 if ( !$insertCats ) {
4466                         # Okay, nothing to do
4467                         return;
4468                 }
4469
4470                 $insertRows = array();
4471
4472                 foreach ( $insertCats as $cat ) {
4473                         $insertRows[] = array(
4474                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4475                                 'cat_title' => $cat
4476                         );
4477                 }
4478                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4479
4480                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4481                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4482
4483                 if ( $ns == NS_CATEGORY ) {
4484                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4485                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4486                 } elseif ( $ns == NS_FILE ) {
4487                         $addFields[]    = 'cat_files = cat_files + 1';
4488                         $removeFields[] = 'cat_files = cat_files - 1';
4489                 }
4490
4491                 if ( $added ) {
4492                         $dbw->update(
4493                                 'category',
4494                                 $addFields,
4495                                 array( 'cat_title' => $added ),
4496                                 __METHOD__
4497                         );
4498                 }
4499
4500                 if ( $deleted ) {
4501                         $dbw->update(
4502                                 'category',
4503                                 $removeFields,
4504                                 array( 'cat_title' => $deleted ),
4505                                 __METHOD__
4506                         );
4507                 }
4508         }
4509
4510         /**
4511          * Lightweight method to get the parser output for a page, checking the parser cache
4512          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4513          * consider, so it's not appropriate to use there.
4514          *
4515          * @since 1.16 (r52326) for LiquidThreads
4516          *
4517          * @param $oldid mixed integer Revision ID or null
4518          * @return ParserOutput
4519          */
4520         public function getParserOutput( $oldid = null ) {
4521                 global $wgEnableParserCache, $wgUser;
4522
4523                 // Should the parser cache be used?
4524                 $useParserCache = $wgEnableParserCache &&
4525                         $wgUser->getStubThreshold() == 0 &&
4526                         $this->exists() &&
4527                         $oldid === null;
4528
4529                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4530
4531                 if ( $wgUser->getStubThreshold() ) {
4532                         wfIncrStats( 'pcache_miss_stub' );
4533                 }
4534
4535                 $parserOutput = false;
4536                 if ( $useParserCache ) {
4537                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4538                 }
4539
4540                 if ( $parserOutput === false ) {
4541                         // Cache miss; parse and output it.
4542                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4543
4544                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4545                 } else {
4546                         return $parserOutput;
4547                 }
4548         }
4549
4550         // Deprecated methods
4551         /**
4552          * Get the database which should be used for reads
4553          *
4554          * @return Database
4555          * @deprecated - just call wfGetDB( DB_MASTER ) instead
4556          */
4557         function getDB() {
4558                 wfDeprecated( __METHOD__ );
4559                 return wfGetDB( DB_MASTER );
4560         }
4561
4562 }
4563
4564 class PoolWorkArticleView extends PoolCounterWork {
4565         private $mArticle;
4566
4567         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4568                 parent::__construct( 'ArticleView', $key );
4569                 $this->mArticle = $article;
4570                 $this->cacheable = $useParserCache;
4571                 $this->parserOptions = $parserOptions;
4572         }
4573
4574         function doWork() {
4575                 return $this->mArticle->doViewParse();
4576         }
4577
4578         function getCachedWork() {
4579                 global $wgOut;
4580
4581                 $parserCache = ParserCache::singleton();
4582                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4583
4584                 if ( $this->mArticle->mParserOutput !== false ) {
4585                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4586                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4587                         # Ensure that UI elements requiring revision ID have
4588                         # the correct version information.
4589                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4590                         return true;
4591                 }
4592                 return false;
4593         }
4594
4595         function fallback() {
4596                 return $this->mArticle->tryDirtyCache();
4597         }
4598
4599         function error( $status ) {
4600                 global $wgOut;
4601
4602                 $wgOut->clearHTML(); // for release() errors
4603                 $wgOut->enableClientCache( false );
4604                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4605
4606                 $errortext = $status->getWikiText( false, 'view-pool-error' );
4607                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4608
4609                 return false;
4610         }
4611 }