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
  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                 $oldid = $this->getOldID();
 405                 $this->mOldId = $oldid;
 406                 $this->fetchContent( $oldid );
 407
 408                 wfProfileOut( __METHOD__ );
 409         }
 410
 411         /**
 412          * Fetch a page record with the given conditions
 413          * @param $dbr Database object
 414          * @param $conditions Array
 415          * @return mixed Database result resource, or false on failure
 416          */
 417         protected function pageData( $dbr, $conditions ) {
 418                 $fields = array(
 419                                 'page_id',
 420                                 'page_namespace',
 421                                 'page_title',
 422                                 'page_restrictions',
 423                                 'page_counter',
 424                                 'page_is_redirect',
 425                                 'page_is_new',
 426                                 'page_random',
 427                                 'page_touched',
 428                                 'page_latest',
 429                                 'page_len',
 430                 );
 431
 432                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 433
 434                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 435
 436                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 437
 438                 return $row;
 439         }
 440
 441         /**
 442          * Fetch a page record matching the Title object's namespace and title
 443          * using a sanitized title string
 444          *
 445          * @param $dbr Database object
 446          * @param $title Title object
 447          * @return mixed Database result resource, or false on failure
 448          */
 449         public function pageDataFromTitle( $dbr, $title ) {
 450                 return $this->pageData( $dbr, array(
 451                         'page_namespace' => $title->getNamespace(),
 452                         'page_title'     => $title->getDBkey() ) );
 453         }
 454
 455         /**
 456          * Fetch a page record matching the requested ID
 457          *
 458          * @param $dbr Database
 459          * @param $id Integer
 460          */
 461         protected function pageDataFromId( $dbr, $id ) {
 462                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 463         }
 464
 465         /**
 466          * Set the general counter, title etc data loaded from
 467          * some source.
 468          *
 469          * @param $data Database row object or "fromdb"
 470          */
 471         public function loadPageData( $data = 'fromdb' ) {
 472                 if ( $data === 'fromdb' ) {
 473                         $dbr = wfGetDB( DB_MASTER );
 474                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 475                 }
 476
 477                 $lc = LinkCache::singleton();
 478
 479                 if ( $data ) {
 480                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 481
 482                         $this->mTitle->mArticleID = intval( $data->page_id );
 483
 484                         # Old-fashioned restrictions
 485                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 486
 487                         $this->mCounter     = intval( $data->page_counter );
 488                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 489                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 490                         $this->mLatest      = intval( $data->page_latest );
 491                 } else {
 492                         $lc->addBadLinkObj( $this->mTitle );
 493                         $this->mTitle->mArticleID = 0;
 494                 }
 495
 496                 $this->mDataLoaded = true;
 497         }
 498
 499         /**
 500          * Get text of an article from database
 501          * Does *NOT* follow redirects.
 502          *
 503          * @param $oldid Int: 0 for whatever the latest revision is
 504          * @return mixed string containing article contents, or false if null
 505          */
 506         function fetchContent( $oldid = 0 ) {
 507                 if ( $this->mContentLoaded ) {
 508                         return $this->mContent;
 509                 }
 510
 511                 $dbr = wfGetDB( DB_MASTER );
 512
 513                 # Pre-fill content with error message so that if something
 514                 # fails we'll have something telling us what we intended.
 515                 $t = $this->mTitle->getPrefixedText();
 516                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 517                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 518
 519                 if ( $oldid ) {
 520                         $revision = Revision::newFromId( $oldid );
 521                         if ( $revision === null ) {
 522                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 523                                 return false;
 524                         }
 525
 526                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 527
 528                         if ( !$data ) {
 529                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 530                                 return false;
 531                         }
 532
 533                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 534                         $this->loadPageData( $data );
 535                 } else {
 536                         if ( !$this->mDataLoaded ) {
 537                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 538
 539                                 if ( !$data ) {
 540                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 541                                         return false;
 542                                 }
 543
 544                                 $this->loadPageData( $data );
 545                         }
 546                         $revision = Revision::newFromId( $this->mLatest );
 547                         if (  $revision === null ) {
 548                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 549                                 return false;
 550                         }
 551                 }
 552
 553                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 554                 // We should instead work with the Revision object when we need it...
 555                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 556
 557                 $this->mUser      = $revision->getUser();
 558                 $this->mUserText  = $revision->getUserText();
 559                 $this->mComment   = $revision->getComment();
 560                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 561
 562                 $this->mRevIdFetched = $revision->getId();
 563                 $this->mContentLoaded = true;
 564                 $this->mRevision =& $revision;
 565
 566                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 567
 568                 return $this->mContent;
 569         }
 570
 571         /**
 572          * Read/write accessor to select FOR UPDATE
 573          *
 574          * @param $x Mixed: FIXME
 575          * @return mixed value of $x, or value stored in Article::mForUpdate
 576          */
 577         public function forUpdate( $x = null ) {
 578                 return wfSetVar( $this->mForUpdate, $x );
 579         }
 580
 581         /**
 582          * Get options for all SELECT statements
 583          *
 584          * @param $options Array: an optional options array which'll be appended to
 585          *                       the default
 586          * @return Array: options
 587          */
 588         protected function getSelectOptions( $options = '' ) {
 589                 if ( $this->mForUpdate ) {
 590                         if ( is_array( $options ) ) {
 591                                 $options[] = 'FOR UPDATE';
 592                         } else {
 593                                 $options = 'FOR UPDATE';
 594                         }
 595                 }
 596
 597                 return $options;
 598         }
 599
 600         /**
 601          * @return int Page ID
 602          */
 603         public function getID() {
 604                 return $this->mTitle->getArticleID();
 605         }
 606
 607         /**
 608          * @return bool Whether or not the page exists in the database
 609          */
 610         public function exists() {
 611                 return $this->getId() > 0;
 612         }
 613
 614         /**
 615          * Check if this page is something we're going to be showing
 616          * some sort of sensible content for. If we return false, page
 617          * views (plain action=view) will return an HTTP 404 response,
 618          * so spiders and robots can know they're following a bad link.
 619          *
 620          * @return bool
 621          */
 622         public function hasViewableContent() {
 623                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 624         }
 625
 626         /**
 627          * @return int The view count for the page
 628          */
 629         public function getCount() {
 630                 if ( -1 == $this->mCounter ) {
 631                         $id = $this->getID();
 632
 633                         if ( $id == 0 ) {
 634                                 $this->mCounter = 0;
 635                         } else {
 636                                 $dbr = wfGetDB( DB_SLAVE );
 637                                 $this->mCounter = $dbr->selectField( 'page',
 638                                         'page_counter',
 639                                         array( 'page_id' => $id ),
 640                                         __METHOD__,
 641                                         $this->getSelectOptions()
 642                                 );
 643                         }
 644                 }
 645
 646                 return $this->mCounter;
 647         }
 648
 649         /**
 650          * Determine whether a page would be suitable for being counted as an
 651          * article in the site_stats table based on the title & its content
 652          *
 653          * @param $text String: text to analyze
 654          * @return bool
 655          */
 656         public function isCountable( $text ) {
 657                 global $wgUseCommaCount;
 658
 659                 $token = $wgUseCommaCount ? ',' : '[[';
 660
 661                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 662         }
 663
 664         /**
 665          * Tests if the article text represents a redirect
 666          *
 667          * @param $text mixed string containing article contents, or boolean
 668          * @return bool
 669          */
 670         public function isRedirect( $text = false ) {
 671                 if ( $text === false ) {
 672                         if ( $this->mDataLoaded ) {
 673                                 return $this->mIsRedirect;
 674                         }
 675
 676                         // Apparently loadPageData was never called
 677                         $this->loadContent();
 678                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 679                 } else {
 680                         $titleObj = Title::newFromRedirect( $text );
 681                 }
 682
 683                 return $titleObj !== null;
 684         }
 685
 686         /**
 687          * Returns true if the currently-referenced revision is the current edit
 688          * to this page (and it exists).
 689          * @return bool
 690          */
 691         public function isCurrent() {
 692                 # If no oldid, this is the current version.
 693                 if ( $this->getOldID() == 0 ) {
 694                         return true;
 695                 }
 696
 697                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 698         }
 699
 700         /**
 701          * Loads everything except the text
 702          * This isn't necessary for all uses, so it's only done if needed.
 703          */
 704         protected function loadLastEdit() {
 705                 if ( -1 != $this->mUser ) {
 706                         return;
 707                 }
 708
 709                 # New or non-existent articles have no user information
 710                 $id = $this->getID();
 711                 if ( 0 == $id ) {
 712                         return;
 713                 }
 714
 715                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 716                 if ( !is_null( $this->mLastRevision ) ) {
 717                         $this->mUser      = $this->mLastRevision->getUser();
 718                         $this->mUserText  = $this->mLastRevision->getUserText();
 719                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 720                         $this->mComment   = $this->mLastRevision->getComment();
 721                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 722                         $this->mRevIdFetched = $this->mLastRevision->getId();
 723                 }
 724         }
 725
 726         /**
 727          * @return string GMT timestamp of last article revision
 728          **/
 729
 730         public function getTimestamp() {
 731                 // Check if the field has been filled by ParserCache::get()
 732                 if ( !$this->mTimestamp ) {
 733                         $this->loadLastEdit();
 734                 }
 735
 736                 return wfTimestamp( TS_MW, $this->mTimestamp );
 737         }
 738
 739         /**
 740          * @return int user ID for the user that made the last article revision
 741          */
 742         public function getUser() {
 743                 $this->loadLastEdit();
 744                 return $this->mUser;
 745         }
 746
 747         /**
 748          * @return string username of the user that made the last article revision
 749          */
 750         public function getUserText() {
 751                 $this->loadLastEdit();
 752                 return $this->mUserText;
 753         }
 754
 755         /**
 756          * @return string Comment stored for the last article revision
 757          */
 758         public function getComment() {
 759                 $this->loadLastEdit();
 760                 return $this->mComment;
 761         }
 762
 763         /**
 764          * Returns true if last revision was marked as "minor edit"
 765          *
 766          * @return boolean Minor edit indicator for the last article revision.
 767          */
 768         public function getMinorEdit() {
 769                 $this->loadLastEdit();
 770                 return $this->mMinorEdit;
 771         }
 772
 773         /**
 774          * Use this to fetch the rev ID used on page views
 775          *
 776          * @return int revision ID of last article revision
 777          */
 778         public function getRevIdFetched() {
 779                 $this->loadLastEdit();
 780                 return $this->mRevIdFetched;
 781         }
 782
 783         /**
 784          * FIXME: this does what?
 785          * @param $limit Integer: default 0.
 786          * @param $offset Integer: default 0.
 787          * @return UserArrayFromResult object with User objects of article contributors for requested range
 788          */
 789         public function getContributors( $limit = 0, $offset = 0 ) {
 790                 # FIXME: this is expensive; cache this info somewhere.
 791
 792                 $dbr = wfGetDB( DB_SLAVE );
 793                 $revTable = $dbr->tableName( 'revision' );
 794                 $userTable = $dbr->tableName( 'user' );
 795
 796                 $pageId = $this->getId();
 797
 798                 $user = $this->getUser();
 799
 800                 if ( $user ) {
 801                         $excludeCond = "AND rev_user != $user";
 802                 } else {
 803                         $userText = $dbr->addQuotes( $this->getUserText() );
 804                         $excludeCond = "AND rev_user_text != $userText";
 805                 }
 806
 807                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 808
 809                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 810                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 811                         WHERE rev_page = $pageId
 812                         $excludeCond
 813                         AND $deletedBit = 0
 814                         GROUP BY rev_user, rev_user_text
 815                         ORDER BY timestamp DESC";
 816
 817                 if ( $limit > 0 ) {
 818                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 819                 }
 820
 821                 $sql .= ' ' . $this->getSelectOptions();
 822                 $res = $dbr->query( $sql, __METHOD__ );
 823
 824                 return new UserArrayFromResult( $res );
 825         }
 826
 827         /**
 828          * This is the default action of the index.php entry point: just view the
 829          * page of the given title.
 830          */
 831         public function view() {
 832                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 833                 global $wgUseFileCache, $wgUseETag;
 834
 835                 wfProfileIn( __METHOD__ );
 836
 837                 # Get variables from query string
 838                 $oldid = $this->getOldID();
 839                 $parserCache = ParserCache::singleton();
 840
 841                 $parserOptions = $this->getParserOptions();
 842                 # Render printable version, use printable version cache
 843                 if ( $wgOut->isPrintable() ) {
 844                         $parserOptions->setIsPrintable( true );
 845                         $parserOptions->setEditSection( false );
 846                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 847                         $parserOptions->setEditSection( false );
 848                 }
 849
 850                 # Try client and file cache
 851                 if ( $oldid === 0 && $this->checkTouched() ) {
 852                         if ( $wgUseETag ) {
 853                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 854                         }
 855
 856                         # Is it client cached?
 857                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 858                                 wfDebug( __METHOD__ . ": done 304\n" );
 859                                 wfProfileOut( __METHOD__ );
 860
 861                                 return;
 862                         # Try file cache
 863                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 864                                 wfDebug( __METHOD__ . ": done file cache\n" );
 865                                 # tell wgOut that output is taken care of
 866                                 $wgOut->disable();
 867                                 $this->viewUpdates();
 868                                 wfProfileOut( __METHOD__ );
 869
 870                                 return;
 871                         }
 872                 }
 873
 874                 # getOldID may want us to redirect somewhere else
 875                 if ( $this->mRedirectUrl ) {
 876                         $wgOut->redirect( $this->mRedirectUrl );
 877                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 878                         wfProfileOut( __METHOD__ );
 879
 880                         return;
 881                 }
 882
 883                 $wgOut->setArticleFlag( true );
 884                 # Set page title (may be overridden by DISPLAYTITLE)
 885                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 886
 887                 # If we got diff in the query, we want to see a diff page instead of the article.
 888                 if ( $wgRequest->getCheck( 'diff' ) ) {
 889                         wfDebug( __METHOD__ . ": showing diff page\n" );
 890                         $this->showDiffPage();
 891                         wfProfileOut( __METHOD__ );
 892
 893                         return;
 894                 }
 895
 896                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 897                         $parserOptions->setEditSection( false );
 898                 }
 899
 900                 # Should the parser cache be used?
 901                 $useParserCache = $this->useParserCache( $oldid );
 902                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 903                 if ( $wgUser->getStubThreshold() ) {
 904                         wfIncrStats( 'pcache_miss_stub' );
 905                 }
 906
 907                 $wasRedirected = $this->showRedirectedFromHeader();
 908                 $this->showNamespaceHeader();
 909
 910                 # Iterate through the possible ways of constructing the output text.
 911                 # Keep going until $outputDone is set, or we run out of things to do.
 912                 $pass = 0;
 913                 $outputDone = false;
 914                 $this->mParserOutput = false;
 915
 916                 while ( !$outputDone && ++$pass ) {
 917                         switch( $pass ) {
 918                                 case 1:
 919                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 920                                         break;
 921                                 case 2:
 922                                         # Try the parser cache
 923                                         if ( $useParserCache ) {
 924                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 925
 926                                                 if ( $this->mParserOutput !== false ) {
 927                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 928                                                         $wgOut->addParserOutput( $this->mParserOutput );
 929                                                         # Ensure that UI elements requiring revision ID have
 930                                                         # the correct version information.
 931                                                         $wgOut->setRevisionId( $this->mLatest );
 932                                                         $outputDone = true;
 933                                                 }
 934                                         }
 935                                         break;
 936                                 case 3:
 937                                         $text = $this->getContent();
 938                                         if ( $text === false || $this->getID() == 0 ) {
 939                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 940                                                 $this->showMissingArticle();
 941                                                 wfProfileOut( __METHOD__ );
 942                                                 return;
 943                                         }
 944
 945                                         # Another whitelist check in case oldid is altering the title
 946                                         if ( !$this->mTitle->userCanRead() ) {
 947                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 948                                                 $wgOut->loginToUse();
 949                                                 $wgOut->output();
 950                                                 $wgOut->disable();
 951                                                 wfProfileOut( __METHOD__ );
 952                                                 return;
 953                                         }
 954
 955                                         # Are we looking at an old revision
 956                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 957                                                 $this->setOldSubtitle( $oldid );
 958
 959                                                 if ( !$this->showDeletedRevisionHeader() ) {
 960                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 961                                                         wfProfileOut( __METHOD__ );
 962                                                         return;
 963                                                 }
 964
 965                                                 # If this "old" version is the current, then try the parser cache...
 966                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 967                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 968                                                         if ( $this->mParserOutput ) {
 969                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 970                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 971                                                                 $wgOut->setRevisionId( $this->mLatest );
 972                                                                 $outputDone = true;
 973                                                                 break;
 974                                                         }
 975                                                 }
 976                                         }
 977
 978                                         # Ensure that UI elements requiring revision ID have
 979                                         # the correct version information.
 980                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 981
 982                                         # Pages containing custom CSS or JavaScript get special treatment
 983                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 984                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 985                                                 $this->showCssOrJsPage();
 986                                                 $outputDone = true;
 987                                         } else {
 988                                                 $rt = Title::newFromRedirectArray( $text );
 989                                                 if ( $rt ) {
 990                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 991                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 992                                                         # Don't append the subtitle if this was an old revision
 993                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 994                                                         # Parse just to get categories, displaytitle, etc.
 995                                                         $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 996                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 997                                                         $outputDone = true;
 998                                                 }
 999                                         }
1000                                         break;
1001                                 case 4:
1002                                         # Run the parse, protected by a pool counter
1003                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1004
1005                                         $this->checkTouched();
1006                                         $key = $parserCache->getKey( $this, $parserOptions );
1007                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1008
1009                                         if ( !$poolArticleView->execute() ) {
1010                                                 # Connection or timeout error
1011                                                 wfProfileOut( __METHOD__ );
1012                                                 return;
1013                                         } else {
1014                                                 $outputDone = true;
1015                                         }
1016                                         break;
1017                                 # Should be unreachable, but just in case...
1018                                 default:
1019                                         break 2;
1020                         }
1021                 }
1022
1023                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1024                 if ( $this->mParserOutput ) {
1025                         $titleText = $this->mParserOutput->getTitleText();
1026
1027                         if ( strval( $titleText ) !== '' ) {
1028                                 $wgOut->setPageTitle( $titleText );
1029                         }
1030                 }
1031
1032                 # For the main page, overwrite the <title> element with the con-
1033                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1034                 # that's not empty).
1035                 # This message always exists because it is in the i18n files
1036                 if ( $this->mTitle->equals( Title::newMainPage() )
1037                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
1038                 {
1039                         $wgOut->setHTMLTitle( $m );
1040                 }
1041
1042                 # Now that we've filled $this->mParserOutput, we know whether
1043                 # there are any __NOINDEX__ tags on the page
1044                 $policy = $this->getRobotPolicy( 'view' );
1045                 $wgOut->setIndexPolicy( $policy['index'] );
1046                 $wgOut->setFollowPolicy( $policy['follow'] );
1047
1048                 $this->showViewFooter();
1049                 $this->viewUpdates();
1050                 wfProfileOut( __METHOD__ );
1051         }
1052
1053         /**
1054          * Show a diff page according to current request variables. For use within
1055          * Article::view() only, other callers should use the DifferenceEngine class.
1056          */
1057         public function showDiffPage() {
1058                 global $wgRequest, $wgUser;
1059
1060                 $diff = $wgRequest->getVal( 'diff' );
1061                 $rcid = $wgRequest->getVal( 'rcid' );
1062                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1063                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1064                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1065                 $oldid = $this->getOldID();
1066
1067                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1068                 // DifferenceEngine directly fetched the revision:
1069                 $this->mRevIdFetched = $de->mNewid;
1070                 $de->showDiffPage( $diffOnly );
1071
1072                 // Needed to get the page's current revision
1073                 $this->loadPageData();
1074                 if ( $diff == 0 || $diff == $this->mLatest ) {
1075                         # Run view updates for current revision only
1076                         $this->viewUpdates();
1077                 }
1078         }
1079
1080         /**
1081          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1082          * Article::view() only.
1083          *
1084          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1085          * page views.
1086          */
1087         protected function showCssOrJsPage() {
1088                 global $wgOut;
1089
1090                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1091
1092                 // Give hooks a chance to customise the output
1093                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1094                         // Wrap the whole lot in a <pre> and don't parse
1095                         $m = array();
1096                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1097                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1098                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1099                         $wgOut->addHTML( "\n</pre>\n" );
1100                 }
1101         }
1102
1103         /**
1104          * Get the robot policy to be used for the current view
1105          * @param $action String the action= GET parameter
1106          * @return Array the policy that should be set
1107          * TODO: actions other than 'view'
1108          */
1109         public function getRobotPolicy( $action ) {
1110                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1111                 global $wgDefaultRobotPolicy, $wgRequest;
1112
1113                 $ns = $this->mTitle->getNamespace();
1114
1115                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1116                         # Don't index user and user talk pages for blocked users (bug 11443)
1117                         if ( !$this->mTitle->isSubpage() ) {
1118                                 $block = new Block();
1119                                 if ( $block->load( $this->mTitle->getText() ) ) {
1120                                         return array(
1121                                                 'index'  => 'noindex',
1122                                                 'follow' => 'nofollow'
1123                                         );
1124                                 }
1125                         }
1126                 }
1127
1128                 if ( $this->getID() === 0 || $this->getOldID() ) {
1129                         # Non-articles (special pages etc), and old revisions
1130                         return array(
1131                                 'index'  => 'noindex',
1132                                 'follow' => 'nofollow'
1133                         );
1134                 } elseif ( $wgOut->isPrintable() ) {
1135                         # Discourage indexing of printable versions, but encourage following
1136                         return array(
1137                                 'index'  => 'noindex',
1138                                 'follow' => 'follow'
1139                         );
1140                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1141                         # For ?curid=x urls, disallow indexing
1142                         return array(
1143                                 'index'  => 'noindex',
1144                                 'follow' => 'follow'
1145                         );
1146                 }
1147
1148                 # Otherwise, construct the policy based on the various config variables.
1149                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1150
1151                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1152                         # Honour customised robot policies for this namespace
1153                         $policy = array_merge(
1154                                 $policy,
1155                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1156                         );
1157                 }
1158                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1159                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1160                         # a final sanity check that we have really got the parser output.
1161                         $policy = array_merge(
1162                                 $policy,
1163                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1164                         );
1165                 }
1166
1167                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1168                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1169                         $policy = array_merge(
1170                                 $policy,
1171                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1172                         );
1173                 }
1174
1175                 return $policy;
1176         }
1177
1178         /**
1179          * Converts a String robot policy into an associative array, to allow
1180          * merging of several policies using array_merge().
1181          * @param $policy Mixed, returns empty array on null/false/'', transparent
1182          *            to already-converted arrays, converts String.
1183          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1184          */
1185         public static function formatRobotPolicy( $policy ) {
1186                 if ( is_array( $policy ) ) {
1187                         return $policy;
1188                 } elseif ( !$policy ) {
1189                         return array();
1190                 }
1191
1192                 $policy = explode( ',', $policy );
1193                 $policy = array_map( 'trim', $policy );
1194
1195                 $arr = array();
1196                 foreach ( $policy as $var ) {
1197                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1198                                 $arr['index'] = $var;
1199                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1200                                 $arr['follow'] = $var;
1201                         }
1202                 }
1203
1204                 return $arr;
1205         }
1206
1207         /**
1208          * If this request is a redirect view, send "redirected from" subtitle to
1209          * $wgOut. Returns true if the header was needed, false if this is not a
1210          * redirect view. Handles both local and remote redirects.
1211          *
1212          * @return boolean
1213          */
1214         public function showRedirectedFromHeader() {
1215                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1216
1217                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1218                 $sk = $wgUser->getSkin();
1219
1220                 if ( isset( $this->mRedirectedFrom ) ) {
1221                         // This is an internally redirected page view.
1222                         // We'll need a backlink to the source page for navigation.
1223                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1224                                 $redir = $sk->link(
1225                                         $this->mRedirectedFrom,
1226                                         null,
1227                                         array(),
1228                                         array( 'redirect' => 'no' ),
1229                                         array( 'known', 'noclasses' )
1230                                 );
1231
1232                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1233                                 $wgOut->setSubtitle( $s );
1234
1235                                 // Set the fragment if one was specified in the redirect
1236                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1237                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1238                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1239                                 }
1240
1241                                 // Add a <link rel="canonical"> tag
1242                                 $wgOut->addLink( array( 'rel' => 'canonical',
1243                                         'href' => $this->mTitle->getLocalURL() )
1244                                 );
1245
1246                                 return true;
1247                         }
1248                 } elseif ( $rdfrom ) {
1249                         // This is an externally redirected view, from some other wiki.
1250                         // If it was reported from a trusted site, supply a backlink.
1251                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1252                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1253                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1254                                 $wgOut->setSubtitle( $s );
1255
1256                                 return true;
1257                         }
1258                 }
1259
1260                 return false;
1261         }
1262
1263         /**
1264          * Show a header specific to the namespace currently being viewed, like
1265          * [[MediaWiki:Talkpagetext]]. For Article::view().
1266          */
1267         public function showNamespaceHeader() {
1268                 global $wgOut;
1269
1270                 if ( $this->mTitle->isTalkPage() ) {
1271                         $msg = wfMsgNoTrans( 'talkpageheader' );
1272                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1273                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1274                         }
1275                 }
1276         }
1277
1278         /**
1279          * Show the footer section of an ordinary page view
1280          */
1281         public function showViewFooter() {
1282                 global $wgOut, $wgUseTrackbacks;
1283
1284                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1285                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1286                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1287                 }
1288
1289                 # If we have been passed an &rcid= parameter, we want to give the user a
1290                 # chance to mark this new article as patrolled.
1291                 $this->showPatrolFooter();
1292
1293                 # Trackbacks
1294                 if ( $wgUseTrackbacks ) {
1295                         $this->addTrackbacks();
1296                 }
1297         }
1298
1299         /**
1300          * If patrol is possible, output a patrol UI box. This is called from the
1301          * footer section of ordinary page views. If patrol is not possible or not
1302          * desired, does nothing.
1303          */
1304         public function showPatrolFooter() {
1305                 global $wgOut, $wgRequest, $wgUser;
1306
1307                 $rcid = $wgRequest->getVal( 'rcid' );
1308
1309                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1310                         return;
1311                 }
1312
1313                 $sk = $wgUser->getSkin();
1314                 $token = $wgUser->editToken( $rcid );
1315
1316                 $wgOut->addHTML(
1317                         "<div class='patrollink'>" .
1318                                 wfMsgHtml(
1319                                         'markaspatrolledlink',
1320                                         $sk->link(
1321                                                 $this->mTitle,
1322                                                 wfMsgHtml( 'markaspatrolledtext' ),
1323                                                 array(),
1324                                                 array(
1325                                                         'action' => 'markpatrolled',
1326                                                         'rcid' => $rcid,
1327                                                         'token' => $token,
1328                                                 ),
1329                                                 array( 'known', 'noclasses' )
1330                                         )
1331                                 ) .
1332                         '</div>'
1333                 );
1334         }
1335
1336         /**
1337          * Show the error text for a missing article. For articles in the MediaWiki
1338          * namespace, show the default message text. To be called from Article::view().
1339          */
1340         public function showMissingArticle() {
1341                 global $wgOut, $wgRequest, $wgUser;
1342
1343                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1344                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1345                         $parts = explode( '/', $this->mTitle->getText() );
1346                         $rootPart = $parts[0];
1347                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1348                         $ip = User::isIP( $rootPart );
1349
1350                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1351                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1352                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1353                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1354                                 LogEventsList::showLogExtract(
1355                                         $wgOut,
1356                                         'block',
1357                                         $user->getUserPage()->getPrefixedText(),
1358                                         '',
1359                                         array(
1360                                                 'lim' => 1,
1361                                                 'showIfEmpty' => false,
1362                                                 'msgKey' => array(
1363                                                         'blocked-notice-logextract',
1364                                                         $user->getName() # Support GENDER in notice
1365                                                 )
1366                                         )
1367                                 );
1368                         }
1369                 }
1370
1371                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1372
1373                 # Show delete and move logs
1374                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1375                         array(  'lim' => 10,
1376                                 'conds' => array( "log_action != 'revision'" ),
1377                                 'showIfEmpty' => false,
1378                                 'msgKey' => array( 'moveddeleted-notice' ) )
1379                 );
1380
1381                 # Show error message
1382                 $oldid = $this->getOldID();
1383                 if ( $oldid ) {
1384                         $text = wfMsgNoTrans( 'missing-article',
1385                                 $this->mTitle->getPrefixedText(),
1386                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1387                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1388                         // Use the default message text
1389                         $text = $this->getContent();
1390                 } else {
1391                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1392                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1393                         $errors = array_merge( $createErrors, $editErrors );
1394
1395                         if ( !count( $errors ) ) {
1396                                 $text = wfMsgNoTrans( 'noarticletext' );
1397                         } else {
1398                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1399                         }
1400                 }
1401                 $text = "<div class='noarticletext'>\n$text\n</div>";
1402
1403                 if ( !$this->hasViewableContent() ) {
1404                         // If there's no backing content, send a 404 Not Found
1405                         // for better machine handling of broken links.
1406                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1407                 }
1408
1409                 $wgOut->addWikiText( $text );
1410         }
1411
1412         /**
1413          * If the revision requested for view is deleted, check permissions.
1414          * Send either an error message or a warning header to $wgOut.
1415          *
1416          * @return boolean true if the view is allowed, false if not.
1417          */
1418         public function showDeletedRevisionHeader() {
1419                 global $wgOut, $wgRequest;
1420
1421                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1422                         // Not deleted
1423                         return true;
1424                 }
1425
1426                 // If the user is not allowed to see it...
1427                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1428                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1429                                 'rev-deleted-text-permission' );
1430
1431                         return false;
1432                 // If the user needs to confirm that they want to see it...
1433                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1434                         # Give explanation and add a link to view the revision...
1435                         $oldid = intval( $this->getOldID() );
1436                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1437                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1438                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1439                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1440                                 array( $msg, $link ) );
1441
1442                         return false;
1443                 // We are allowed to see...
1444                 } else {
1445                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1446                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1447                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1448
1449                         return true;
1450                 }
1451         }
1452
1453         /**
1454          * Should the parser cache be used?
1455          *
1456          * @return boolean
1457          */
1458         public function useParserCache( $oldid ) {
1459                 global $wgUser, $wgEnableParserCache;
1460
1461                 return $wgEnableParserCache
1462                         && $wgUser->getStubThreshold() == 0
1463                         && $this->exists()
1464                         && empty( $oldid )
1465                         && !$this->mTitle->isCssOrJsPage()
1466                         && !$this->mTitle->isCssJsSubpage();
1467         }
1468
1469         /**
1470          * Execute the uncached parse for action=view
1471          */
1472         public function doViewParse() {
1473                 global $wgOut;
1474
1475                 $oldid = $this->getOldID();
1476                 $parserOptions = $this->getParserOptions();
1477
1478                 # Render printable version, use printable version cache
1479                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1480
1481                 # Don't show section-edit links on old revisions... this way lies madness.
1482                 if ( !$this->isCurrent() || $wgOut->isPrintable() ) {
1483                         $parserOptions->setEditSection( false );
1484                 }
1485
1486                 $useParserCache = $this->useParserCache( $oldid );
1487                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1488
1489                 return true;
1490         }
1491
1492         /**
1493          * Try to fetch an expired entry from the parser cache. If it is present,
1494          * output it and return true. If it is not present, output nothing and
1495          * return false. This is used as a callback function for
1496          * PoolCounter::executeProtected().
1497          *
1498          * @return boolean
1499          */
1500         public function tryDirtyCache() {
1501                 global $wgOut;
1502                 $parserCache = ParserCache::singleton();
1503                 $options = clone $this->getParserOptions();
1504
1505                 if ( $wgOut->isPrintable() ) {
1506                         $options->setIsPrintable( true );
1507                         $options->setEditSection( false );
1508                 }
1509
1510                 $output = $parserCache->getDirty( $this, $options );
1511
1512                 if ( $output ) {
1513                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1514                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1515                         $wgOut->setSquidMaxage( 0 );
1516                         $this->mParserOutput = $output;
1517                         $wgOut->addParserOutput( $output );
1518                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1519
1520                         return true;
1521                 } else {
1522                         wfDebugLog( 'dirty', "dirty missing\n" );
1523                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1524
1525                         return false;
1526                 }
1527         }
1528
1529         /**
1530          * View redirect
1531          *
1532          * @param $target Title object or Array of destination(s) to redirect
1533          * @param $appendSubtitle Boolean [optional]
1534          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1535          * @return string containing HMTL with redirect link
1536          */
1537         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1538                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1539
1540                 if ( !is_array( $target ) ) {
1541                         $target = array( $target );
1542                 }
1543
1544                 $imageDir = $wgContLang->getDir();
1545
1546                 if ( $appendSubtitle ) {
1547                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1548                 }
1549
1550                 $sk = $wgUser->getSkin();
1551                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1552                 $title = array_shift( $target );
1553
1554                 if ( $forceKnown ) {
1555                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1556                 } else {
1557                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1558                 }
1559
1560                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1561                 $alt = $wgContLang->isRTL() ? '←' : '→';
1562                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1563                 // FIXME: where this happens?
1564                 foreach ( $target as $rt ) {
1565                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1566                         if ( $forceKnown ) {
1567                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText() ) );
1568                         } else {
1569                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1570                         }
1571                 }
1572
1573                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1574                 return '<div class="redirectMsg">' .
1575                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1576                         '<span class="redirectText">' . $link . '</span></div>';
1577         }
1578
1579         /**
1580          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1581          */
1582         public function addTrackbacks() {
1583                 global $wgOut, $wgUser;
1584
1585                 $dbr = wfGetDB( DB_SLAVE );
1586                 $tbs = $dbr->select( 'trackbacks',
1587                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1588                         array( 'tb_page' => $this->getID() )
1589                 );
1590
1591                 if ( !$dbr->numRows( $tbs ) ) {
1592                         return;
1593                 }
1594
1595                 $tbtext = "";
1596                 foreach ( $tbs as $o ) {
1597                         $rmvtxt = "";
1598
1599                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1600                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1601                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1602                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1603                         }
1604
1605                         $tbtext .= "\n";
1606                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1607                                         $o->tb_title,
1608                                         $o->tb_url,
1609                                         $o->tb_ex,
1610                                         $o->tb_name,
1611                                         $rmvtxt );
1612                 }
1613
1614                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1615         }
1616
1617         /**
1618          * Removes trackback record for current article from trackbacks table
1619          */
1620         public function deletetrackback() {
1621                 global $wgUser, $wgRequest, $wgOut;
1622
1623                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1624                         $wgOut->addWikiMsg( 'sessionfailure' );
1625
1626                         return;
1627                 }
1628
1629                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1630
1631                 if ( count( $permission_errors ) ) {
1632                         $wgOut->showPermissionsErrorPage( $permission_errors );
1633
1634                         return;
1635                 }
1636
1637                 $db = wfGetDB( DB_MASTER );
1638                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1639
1640                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1641                 $this->mTitle->invalidateCache();
1642         }
1643
1644         /**
1645          * Handle action=render
1646          */
1647
1648         public function render() {
1649                 global $wgOut;
1650
1651                 $wgOut->setArticleBodyOnly( true );
1652                 $this->view();
1653         }
1654
1655         /**
1656          * Handle action=purge
1657          */
1658         public function purge() {
1659                 global $wgUser, $wgRequest, $wgOut;
1660
1661                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1662                         //FIXME: shouldn't this be in doPurge()?
1663                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1664                                 $this->doPurge();
1665                                 $this->view();
1666                         }
1667                 } else {
1668                         $formParams = array(
1669                                 'method' => 'post',
1670                                 'action' =>  $wgRequest->getRequestURL(),
1671                         );
1672
1673                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1674
1675                         $form  = Html::openElement( 'form', $formParams );
1676                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1677                         $form .= Html::closeElement( 'form' );
1678
1679                         $wgOut->addHTML( $form );
1680                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1681
1682                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1683                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1684                 }
1685         }
1686
1687         /**
1688          * Perform the actions of a page purging
1689          */
1690         public function doPurge() {
1691                 global $wgUseSquid;
1692
1693                 // Invalidate the cache
1694                 $this->mTitle->invalidateCache();
1695
1696                 if ( $wgUseSquid ) {
1697                         // Commit the transaction before the purge is sent
1698                         $dbw = wfGetDB( DB_MASTER );
1699                         $dbw->commit();
1700
1701                         // Send purge
1702                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1703                         $update->doUpdate();
1704                 }
1705
1706                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1707                         global $wgMessageCache;
1708
1709                         if ( $this->getID() == 0 ) {
1710                                 $text = false;
1711                         } else {
1712                                 $text = $this->getRawText();
1713                         }
1714
1715                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1716                 }
1717         }
1718
1719         /**
1720          * Insert a new empty page record for this article.
1721          * This *must* be followed up by creating a revision
1722          * and running $this->updateRevisionOn( ... );
1723          * or else the record will be left in a funky state.
1724          * Best if all done inside a transaction.
1725          *
1726          * @param $dbw Database
1727          * @return int The newly created page_id key, or false if the title already existed
1728          * @private
1729          */
1730         public function insertOn( $dbw ) {
1731                 wfProfileIn( __METHOD__ );
1732
1733                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1734                 $dbw->insert( 'page', array(
1735                         'page_id'           => $page_id,
1736                         'page_namespace'    => $this->mTitle->getNamespace(),
1737                         'page_title'        => $this->mTitle->getDBkey(),
1738                         'page_counter'      => 0,
1739                         'page_restrictions' => '',
1740                         'page_is_redirect'  => 0, # Will set this shortly...
1741                         'page_is_new'       => 1,
1742                         'page_random'       => wfRandom(),
1743                         'page_touched'      => $dbw->timestamp(),
1744                         'page_latest'       => 0, # Fill this in shortly...
1745                         'page_len'          => 0, # Fill this in shortly...
1746                 ), __METHOD__, 'IGNORE' );
1747
1748                 $affected = $dbw->affectedRows();
1749
1750                 if ( $affected ) {
1751                         $newid = $dbw->insertId();
1752                         $this->mTitle->resetArticleId( $newid );
1753                 }
1754                 wfProfileOut( __METHOD__ );
1755
1756                 return $affected ? $newid : false;
1757         }
1758
1759         /**
1760          * Update the page record to point to a newly saved revision.
1761          *
1762          * @param $dbw DatabaseBase: object
1763          * @param $revision Revision: For ID number, and text used to set
1764                             length and redirect status fields
1765          * @param $lastRevision Integer: if given, will not overwrite the page field
1766          *                      when different from the currently set value.
1767          *                      Giving 0 indicates the new page flag should be set
1768          *                      on.
1769          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1770          *                           removing rows in redirect table.
1771          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1772          *                    Needed when $lastRevision has to be set to sth. !=0
1773          * @return bool true on success, false on failure
1774          * @private
1775          */
1776         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1777                 wfProfileIn( __METHOD__ );
1778
1779                 $text = $revision->getText();
1780                 $rt = Title::newFromRedirectRecurse( $text );
1781
1782                 $conditions = array( 'page_id' => $this->getId() );
1783
1784                 if ( !is_null( $lastRevision ) ) {
1785                         # An extra check against threads stepping on each other
1786                         $conditions['page_latest'] = $lastRevision;
1787                 }
1788
1789                 if ( !$setNewFlag ) {
1790                         $setNewFlag = ( $lastRevision === 0 );
1791                 }
1792
1793                 $dbw->update( 'page',
1794                         array( /* SET */
1795                                 'page_latest'      => $revision->getId(),
1796                                 'page_touched'     => $dbw->timestamp(),
1797                                 'page_is_new'      => $setNewFlag,
1798                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1799                                 'page_len'         => strlen( $text ),
1800                         ),
1801                         $conditions,
1802                         __METHOD__ );
1803
1804                 $result = $dbw->affectedRows() != 0;
1805                 if ( $result ) {
1806                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1807                 }
1808
1809                 wfProfileOut( __METHOD__ );
1810                 return $result;
1811         }
1812
1813         /**
1814          * Add row to the redirect table if this is a redirect, remove otherwise.
1815          *
1816          * @param $dbw Database
1817          * @param $redirectTitle a title object pointing to the redirect target,
1818          *                       or NULL if this is not a redirect
1819          * @param $lastRevIsRedirect If given, will optimize adding and
1820          *                           removing rows in redirect table.
1821          * @return bool true on success, false on failure
1822          * @private
1823          */
1824         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1825                 // Always update redirects (target link might have changed)
1826                 // Update/Insert if we don't know if the last revision was a redirect or not
1827                 // Delete if changing from redirect to non-redirect
1828                 $isRedirect = !is_null( $redirectTitle );
1829
1830                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1831                         wfProfileIn( __METHOD__ );
1832                         if ( $isRedirect ) {
1833                                 $this->insertRedirectEntry( $redirectTitle );
1834                         } else {
1835                                 // This is not a redirect, remove row from redirect table
1836                                 $where = array( 'rd_from' => $this->getId() );
1837                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1838                         }
1839
1840                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1841                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1842                         }
1843                         wfProfileOut( __METHOD__ );
1844
1845                         return ( $dbw->affectedRows() != 0 );
1846                 }
1847
1848                 return true;
1849         }
1850
1851         /**
1852          * If the given revision is newer than the currently set page_latest,
1853          * update the page record. Otherwise, do nothing.
1854          *
1855          * @param $dbw Database object
1856          * @param $revision Revision object
1857          * @return mixed
1858          */
1859         public function updateIfNewerOn( &$dbw, $revision ) {
1860                 wfProfileIn( __METHOD__ );
1861
1862                 $row = $dbw->selectRow(
1863                         array( 'revision', 'page' ),
1864                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1865                         array(
1866                                 'page_id' => $this->getId(),
1867                                 'page_latest=rev_id' ),
1868                         __METHOD__ );
1869
1870                 if ( $row ) {
1871                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1872                                 wfProfileOut( __METHOD__ );
1873                                 return false;
1874                         }
1875                         $prev = $row->rev_id;
1876                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1877                 } else {
1878                         # No or missing previous revision; mark the page as new
1879                         $prev = 0;
1880                         $lastRevIsRedirect = null;
1881                 }
1882
1883                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1884
1885                 wfProfileOut( __METHOD__ );
1886                 return $ret;
1887         }
1888
1889         /**
1890          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1891          * @param $text String: new text of the section
1892          * @param $summary String: new section's subject, only if $section is 'new'
1893          * @param $edittime String: revision timestamp or null to use the current revision
1894          * @return string Complete article text, or null if error
1895          */
1896         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1897                 wfProfileIn( __METHOD__ );
1898
1899                 if ( strval( $section ) == '' ) {
1900                         // Whole-page edit; let the whole text through
1901                 } else {
1902                         if ( is_null( $edittime ) ) {
1903                                 $rev = Revision::newFromTitle( $this->mTitle );
1904                         } else {
1905                                 $dbw = wfGetDB( DB_MASTER );
1906                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1907                         }
1908
1909                         if ( !$rev ) {
1910                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1911                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1912                                 return null;
1913                         }
1914
1915                         $oldtext = $rev->getText();
1916
1917                         if ( $section == 'new' ) {
1918                                 # Inserting a new section
1919                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1920                                 $text = strlen( trim( $oldtext ) ) > 0
1921                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1922                                                 : "{$subject}{$text}";
1923                         } else {
1924                                 # Replacing an existing section; roll out the big guns
1925                                 global $wgParser;
1926
1927                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1928                         }
1929                 }
1930
1931                 wfProfileOut( __METHOD__ );
1932                 return $text;
1933         }
1934
1935         /**
1936          * This function is not deprecated until somebody fixes the core not to use
1937          * it. Nevertheless, use Article::doEdit() instead.
1938          */
1939         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1940                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1941                         ( $isminor ? EDIT_MINOR : 0 ) |
1942                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1943                         ( $bot ? EDIT_FORCE_BOT : 0 );
1944
1945                 # If this is a comment, add the summary as headline
1946                 if ( $comment && $summary != "" ) {
1947                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1948                 }
1949                 $this->doEdit( $text, $summary, $flags );
1950
1951                 $dbw = wfGetDB( DB_MASTER );
1952                 if ( $watchthis ) {
1953                         if ( !$this->mTitle->userIsWatching() ) {
1954                                 $dbw->begin();
1955                                 $this->doWatch();
1956                                 $dbw->commit();
1957                         }
1958                 } else {
1959                         if ( $this->mTitle->userIsWatching() ) {
1960                                 $dbw->begin();
1961                                 $this->doUnwatch();
1962                                 $dbw->commit();
1963                         }
1964                 }
1965                 $this->doRedirect( $this->isRedirect( $text ) );
1966         }
1967
1968         /**
1969          * @deprecated use Article::doEdit()
1970          */
1971         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1972                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1973                         ( $minor ? EDIT_MINOR : 0 ) |
1974                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1975
1976                 $status = $this->doEdit( $text, $summary, $flags );
1977
1978                 if ( !$status->isOK() ) {
1979                         return false;
1980                 }
1981
1982                 $dbw = wfGetDB( DB_MASTER );
1983                 if ( $watchthis ) {
1984                         if ( !$this->mTitle->userIsWatching() ) {
1985                                 $dbw->begin();
1986                                 $this->doWatch();
1987                                 $dbw->commit();
1988                         }
1989                 } else {
1990                         if ( $this->mTitle->userIsWatching() ) {
1991                                 $dbw->begin();
1992                                 $this->doUnwatch();
1993                                 $dbw->commit();
1994                         }
1995                 }
1996
1997                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1998                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1999
2000                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
2001                 return true;
2002         }
2003
2004         /**
2005          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
2006          * @param $flags Int
2007          * @return Int updated $flags
2008          */
2009         function checkFlags( $flags ) {
2010                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
2011                         if ( $this->mTitle->getArticleID() ) {
2012                                 $flags |= EDIT_UPDATE;
2013                         } else {
2014                                 $flags |= EDIT_NEW;
2015                         }
2016                 }
2017
2018                 return $flags;
2019         }
2020
2021         /**
2022          * Article::doEdit()
2023          *
2024          * Change an existing article or create a new article. Updates RC and all necessary caches,
2025          * optionally via the deferred update array.
2026          *
2027          * $wgUser must be set before calling this function.
2028          *
2029          * @param $text String: new text
2030          * @param $summary String: edit summary
2031          * @param $flags Integer bitfield:
2032          *      EDIT_NEW
2033          *          Article is known or assumed to be non-existent, create a new one
2034          *      EDIT_UPDATE
2035          *          Article is known or assumed to be pre-existing, update it
2036          *      EDIT_MINOR
2037          *          Mark this edit minor, if the user is allowed to do so
2038          *      EDIT_SUPPRESS_RC
2039          *          Do not log the change in recentchanges
2040          *      EDIT_FORCE_BOT
2041          *          Mark the edit a "bot" edit regardless of user rights
2042          *      EDIT_DEFER_UPDATES
2043          *          Defer some of the updates until the end of index.php
2044          *      EDIT_AUTOSUMMARY
2045          *          Fill in blank summaries with generated text where possible
2046          *
2047          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2048          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2049          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2050          * edit-already-exists error will be returned. These two conditions are also possible with
2051          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2052          *
2053          * @param $baseRevId the revision ID this edit was based off, if any
2054          * @param $user Optional user object, $wgUser will be used if not passed
2055          *
2056          * @return Status object. Possible errors:
2057          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2058          *     edit-gone-missing:       In update mode, but the article didn't exist
2059          *     edit-conflict:           In update mode, the article changed unexpectedly
2060          *     edit-no-change:          Warning that the text was the same as before
2061          *     edit-already-exists:     In creation mode, but the article already exists
2062          *
2063          *  Extensions may define additional errors.
2064          *
2065          *  $return->value will contain an associative array with members as follows:
2066          *     new:                     Boolean indicating if the function attempted to create a new article
2067          *     revision:                The revision object for the inserted revision, or null
2068          *
2069          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2070          */
2071         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2072                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2073
2074                 # Low-level sanity check
2075                 if ( $this->mTitle->getText() === '' ) {
2076                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2077                 }
2078
2079                 wfProfileIn( __METHOD__ );
2080
2081                 $user = is_null( $user ) ? $wgUser : $user;
2082                 $status = Status::newGood( array() );
2083
2084                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2085                 $this->loadPageData();
2086
2087                 $flags = $this->checkFlags( $flags );
2088
2089                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2090                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2091                 {
2092                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2093                         wfProfileOut( __METHOD__ );
2094
2095                         if ( $status->isOK() ) {
2096                                 $status->fatal( 'edit-hook-aborted' );
2097                         }
2098
2099                         return $status;
2100                 }
2101
2102                 # Silently ignore EDIT_MINOR if not allowed
2103                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2104                 $bot = $flags & EDIT_FORCE_BOT;
2105
2106                 $oldtext = $this->getRawText(); // current revision
2107                 $oldsize = strlen( $oldtext );
2108
2109                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2110                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2111                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2112                 }
2113
2114                 $editInfo = $this->prepareTextForEdit( $text );
2115                 $text = $editInfo->pst;
2116                 $newsize = strlen( $text );
2117
2118                 $dbw = wfGetDB( DB_MASTER );
2119                 $now = wfTimestampNow();
2120                 $this->mTimestamp = $now;
2121
2122                 if ( $flags & EDIT_UPDATE ) {
2123                         # Update article, but only if changed.
2124                         $status->value['new'] = false;
2125
2126                         # Make sure the revision is either completely inserted or not inserted at all
2127                         if ( !$wgDBtransactions ) {
2128                                 $userAbort = ignore_user_abort( true );
2129                         }
2130
2131                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2132
2133                         if ( $changed ) {
2134                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2135                                   - (int)$this->isCountable( $oldtext );
2136                                 $this->mTotalAdjustment = 0;
2137
2138                                 if ( !$this->mLatest ) {
2139                                         # Article gone missing
2140                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2141                                         $status->fatal( 'edit-gone-missing' );
2142
2143                                         wfProfileOut( __METHOD__ );
2144                                         return $status;
2145                                 }
2146
2147                                 $revision = new Revision( array(
2148                                         'page'       => $this->getId(),
2149                                         'comment'    => $summary,
2150                                         'minor_edit' => $isminor,
2151                                         'text'       => $text,
2152                                         'parent_id'  => $this->mLatest,
2153                                         'user'       => $user->getId(),
2154                                         'user_text'  => $user->getName(),
2155                                         'timestamp'  => $now
2156                                 ) );
2157
2158                                 $dbw->begin();
2159                                 $revisionId = $revision->insertOn( $dbw );
2160
2161                                 # Update page
2162                                 #
2163                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2164                                 # during the course of this function. This makes sure that EditPage can detect
2165                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2166                                 # before this function is called. A previous function used a separate query, this
2167                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2168                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2169
2170                                 if ( !$ok ) {
2171                                         /* Belated edit conflict! Run away!! */
2172                                         $status->fatal( 'edit-conflict' );
2173
2174                                         # Delete the invalid revision if the DB is not transactional
2175                                         if ( !$wgDBtransactions ) {
2176                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2177                                         }
2178
2179                                         $revisionId = 0;
2180                                         $dbw->rollback();
2181                                 } else {
2182                                         global $wgUseRCPatrol;
2183                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2184                                         # Update recentchanges
2185                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2186                                                 # Mark as patrolled if the user can do so
2187                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2188                                                 # Add RC row to the DB
2189                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2190                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2191                                                         $revisionId, $patrolled
2192                                                 );
2193
2194                                                 # Log auto-patrolled edits
2195                                                 if ( $patrolled ) {
2196                                                         PatrolLog::record( $rc, true );
2197                                                 }
2198                                         }
2199                                         $user->incEditCount();
2200                                         $dbw->commit();
2201                                 }
2202                         } else {
2203                                 $status->warning( 'edit-no-change' );
2204                                 $revision = null;
2205                                 // Keep the same revision ID, but do some updates on it
2206                                 $revisionId = $this->getRevIdFetched();
2207                                 // Update page_touched, this is usually implicit in the page update
2208                                 // Other cache updates are done in onArticleEdit()
2209                                 $this->mTitle->invalidateCache();
2210                         }
2211
2212                         if ( !$wgDBtransactions ) {
2213                                 ignore_user_abort( $userAbort );
2214                         }
2215
2216                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2217                         if ( !$status->isOK() ) {
2218                                 wfProfileOut( __METHOD__ );
2219                                 return $status;
2220                         }
2221
2222                         # Invalidate cache of this article and all pages using this article
2223                         # as a template. Partly deferred.
2224                         Article::onArticleEdit( $this->mTitle );
2225                         # Update links tables, site stats, etc.
2226                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2227                 } else {
2228                         # Create new article
2229                         $status->value['new'] = true;
2230
2231                         # Set statistics members
2232                         # We work out if it's countable after PST to avoid counter drift
2233                         # when articles are created with {{subst:}}
2234                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2235                         $this->mTotalAdjustment = 1;
2236
2237                         $dbw->begin();
2238
2239                         # Add the page record; stake our claim on this title!
2240                         # This will return false if the article already exists
2241                         $newid = $this->insertOn( $dbw );
2242
2243                         if ( $newid === false ) {
2244                                 $dbw->rollback();
2245                                 $status->fatal( 'edit-already-exists' );
2246
2247                                 wfProfileOut( __METHOD__ );
2248                                 return $status;
2249                         }
2250
2251                         # Save the revision text...
2252                         $revision = new Revision( array(
2253                                 'page'       => $newid,
2254                                 'comment'    => $summary,
2255                                 'minor_edit' => $isminor,
2256                                 'text'       => $text,
2257                                 'user'       => $user->getId(),
2258                                 'user_text'  => $user->getName(),
2259                                 'timestamp'  => $now
2260                         ) );
2261                         $revisionId = $revision->insertOn( $dbw );
2262
2263                         $this->mTitle->resetArticleID( $newid );
2264
2265                         # Update the page record with revision data
2266                         $this->updateRevisionOn( $dbw, $revision, 0 );
2267
2268                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2269
2270                         # Update recentchanges
2271                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2272                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2273
2274                                 # Mark as patrolled if the user can do so
2275                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
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                         Article::incViewCount( $this->getID() );
3575                         $u = new SiteStatsUpdate( 1, 0, 0 );
3576                         array_push( $wgDeferredUpdateList, $u );
3577                 }
3578
3579                 # Update newtalk / watchlist notification status
3580                 $wgUser->clearNotification( $this->mTitle );
3581         }
3582
3583         /**
3584          * Prepare text which is about to be saved.
3585          * Returns a stdclass with source, pst and output members
3586          */
3587         public function prepareTextForEdit( $text, $revid = null ) {
3588                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3589                         // Already prepared
3590                         return $this->mPreparedEdit;
3591                 }
3592
3593                 global $wgParser;
3594
3595                 $edit = (object)array();
3596                 $edit->revid = $revid;
3597                 $edit->newText = $text;
3598                 $edit->pst = $this->preSaveTransform( $text );
3599                 $edit->popts = clone $this->getParserOptions();
3600                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3601                 $edit->oldText = $this->getContent();
3602
3603                 $this->mPreparedEdit = $edit;
3604
3605                 return $edit;
3606         }
3607
3608         /**
3609          * Do standard deferred updates after page edit.
3610          * Update links tables, site stats, search index and message cache.
3611          * Purges pages that include this page if the text was changed here.
3612          * Every 100th edit, prune the recent changes table.
3613          *
3614          * @private
3615          * @param $text String: New text of the article
3616          * @param $summary String: Edit summary
3617          * @param $minoredit Boolean: Minor edit
3618          * @param $timestamp_of_pagechange Timestamp associated with the page change
3619          * @param $newid Integer: rev_id value of the new revision
3620          * @param $changed Boolean: Whether or not the content actually changed
3621          */
3622         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3623                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3624
3625                 wfProfileIn( __METHOD__ );
3626
3627                 # Parse the text
3628                 # Be careful not to double-PST: $text is usually already PST-ed once
3629                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3630                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3631                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3632                 } else {
3633                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3634                         $editInfo = $this->mPreparedEdit;
3635                 }
3636
3637                 # Save it to the parser cache
3638                 if ( $wgEnableParserCache ) {
3639                         $parserCache = ParserCache::singleton();
3640                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3641                 }
3642
3643                 # Update the links tables
3644                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3645                 $u->doUpdate();
3646
3647                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3648
3649                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3650                         if ( 0 == mt_rand( 0, 99 ) ) {
3651                                 // Flush old entries from the `recentchanges` table; we do this on
3652                                 // random requests so as to avoid an increase in writes for no good reason
3653                                 global $wgRCMaxAge;
3654
3655                                 $dbw = wfGetDB( DB_MASTER );
3656                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3657                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3658                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3659
3660                                 $dbw->query( $sql );
3661                         }
3662                 }
3663
3664                 $id = $this->getID();
3665                 $title = $this->mTitle->getPrefixedDBkey();
3666                 $shortTitle = $this->mTitle->getDBkey();
3667
3668                 if ( 0 == $id ) {
3669                         wfProfileOut( __METHOD__ );
3670                         return;
3671                 }
3672
3673                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3674                 array_push( $wgDeferredUpdateList, $u );
3675                 $u = new SearchUpdate( $id, $title, $text );
3676                 array_push( $wgDeferredUpdateList, $u );
3677
3678                 # If this is another user's talk page, update newtalk
3679                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3680                 # load of user talk pages and piss people off, nor if it's a minor edit
3681                 # by a properly-flagged bot.
3682                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3683                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3684                 ) {
3685                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3686                                 $other = User::newFromName( $shortTitle, false );
3687                                 if ( !$other ) {
3688                                         wfDebug( __METHOD__ . ": invalid username\n" );
3689                                 } elseif ( User::isIP( $shortTitle ) ) {
3690                                         // An anonymous user
3691                                         $other->setNewtalk( true );
3692                                 } elseif ( $other->isLoggedIn() ) {
3693                                         $other->setNewtalk( true );
3694                                 } else {
3695                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3696                                 }
3697                         }
3698                 }
3699
3700                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3701                         $wgMessageCache->replace( $shortTitle, $text );
3702                 }
3703
3704                 wfProfileOut( __METHOD__ );
3705         }
3706
3707         /**
3708          * Perform article updates on a special page creation.
3709          *
3710          * @param $rev Revision object
3711          *
3712          * @todo This is a shitty interface function. Kill it and replace the
3713          * other shitty functions like editUpdates and such so it's not needed
3714          * anymore.
3715          */
3716         public function createUpdates( $rev ) {
3717                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3718                 $this->mTotalAdjustment = 1;
3719                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3720                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3721         }
3722
3723         /**
3724          * Generate the navigation links when browsing through an article revisions
3725          * It shows the information as:
3726          *   Revision as of \<date\>; view current revision
3727          *   \<- Previous version | Next Version -\>
3728          *
3729          * @param $oldid String: revision ID of this article revision
3730          */
3731         public function setOldSubtitle( $oldid = 0 ) {
3732                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3733
3734                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3735                         return;
3736                 }
3737
3738                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3739
3740                 # Cascade unhide param in links for easy deletion browsing
3741                 $extraParams = array();
3742                 if ( $wgRequest->getVal( 'unhide' ) ) {
3743                         $extraParams['unhide'] = 1;
3744                 }
3745
3746                 $revision = Revision::newFromId( $oldid );
3747
3748                 $current = ( $oldid == $this->mLatest );
3749                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3750                 $tddate = $wgLang->date( $this->mTimestamp, true );
3751                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3752                 $sk = $wgUser->getSkin();
3753                 $lnk = $current
3754                         ? wfMsgHtml( 'currentrevisionlink' )
3755                         : $sk->link(
3756                                 $this->mTitle,
3757                                 wfMsgHtml( 'currentrevisionlink' ),
3758                                 array(),
3759                                 $extraParams,
3760                                 array( 'known', 'noclasses' )
3761                         );
3762                 $curdiff = $current
3763                         ? wfMsgHtml( 'diff' )
3764                         : $sk->link(
3765                                 $this->mTitle,
3766                                 wfMsgHtml( 'diff' ),
3767                                 array(),
3768                                 array(
3769                                         'diff' => 'cur',
3770                                         'oldid' => $oldid
3771                                 ) + $extraParams,
3772                                 array( 'known', 'noclasses' )
3773                         );
3774                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3775                 $prevlink = $prev
3776                         ? $sk->link(
3777                                 $this->mTitle,
3778                                 wfMsgHtml( 'previousrevision' ),
3779                                 array(),
3780                                 array(
3781                                         'direction' => 'prev',
3782                                         'oldid' => $oldid
3783                                 ) + $extraParams,
3784                                 array( 'known', 'noclasses' )
3785                         )
3786                         : wfMsgHtml( 'previousrevision' );
3787                 $prevdiff = $prev
3788                         ? $sk->link(
3789                                 $this->mTitle,
3790                                 wfMsgHtml( 'diff' ),
3791                                 array(),
3792                                 array(
3793                                         'diff' => 'prev',
3794                                         'oldid' => $oldid
3795                                 ) + $extraParams,
3796                                 array( 'known', 'noclasses' )
3797                         )
3798                         : wfMsgHtml( 'diff' );
3799                 $nextlink = $current
3800                         ? wfMsgHtml( 'nextrevision' )
3801                         : $sk->link(
3802                                 $this->mTitle,
3803                                 wfMsgHtml( 'nextrevision' ),
3804                                 array(),
3805                                 array(
3806                                         'direction' => 'next',
3807                                         'oldid' => $oldid
3808                                 ) + $extraParams,
3809                                 array( 'known', 'noclasses' )
3810                         );
3811                 $nextdiff = $current
3812                         ? wfMsgHtml( 'diff' )
3813                         : $sk->link(
3814                                 $this->mTitle,
3815                                 wfMsgHtml( 'diff' ),
3816                                 array(),
3817                                 array(
3818                                         'diff' => 'next',
3819                                         'oldid' => $oldid
3820                                 ) + $extraParams,
3821                                 array( 'known', 'noclasses' )
3822                         );
3823
3824                 $cdel = '';
3825
3826                 // User can delete revisions or view deleted revisions...
3827                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3828                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3829                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3830                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3831                         } else {
3832                                 $query = array(
3833                                         'type'   => 'revision',
3834                                         'target' => $this->mTitle->getPrefixedDbkey(),
3835                                         'ids'    => $oldid
3836                                 );
3837                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3838                         }
3839                         $cdel .= ' ';
3840                 }
3841
3842                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3843                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3844
3845                 $m = wfMsg( 'revision-info-current' );
3846                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3847                         ? 'revision-info-current'
3848                         : 'revision-info';
3849
3850                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3851                         wfMsgExt(
3852                                 $infomsg,
3853                                 array( 'parseinline', 'replaceafter' ),
3854                                 $td,
3855                                 $userlinks,
3856                                 $revision->getID(),
3857                                 $tddate,
3858                                 $tdtime,
3859                                 $revision->getUser()
3860                         ) .
3861                         "</div>\n" .
3862                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3863                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3864
3865                 $wgOut->setSubtitle( $r );
3866         }
3867
3868         /**
3869          * This function is called right before saving the wikitext,
3870          * so we can do things like signatures and links-in-context.
3871          *
3872          * @param $text String article contents
3873          * @return string article contents with altered wikitext markup (signatures
3874          *      converted, {{subst:}}, templates, etc.)
3875          */
3876         public function preSaveTransform( $text ) {
3877                 global $wgParser, $wgUser;
3878
3879                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3880         }
3881
3882         /* Caching functions */
3883
3884         /**
3885          * checkLastModified returns true if it has taken care of all
3886          * output to the client that is necessary for this request.
3887          * (that is, it has sent a cached version of the page)
3888          *
3889          * @return boolean true if cached version send, false otherwise
3890          */
3891         protected function tryFileCache() {
3892                 static $called = false;
3893
3894                 if ( $called ) {
3895                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3896                         return false;
3897                 }
3898
3899                 $called = true;
3900                 if ( $this->isFileCacheable() ) {
3901                         $cache = new HTMLFileCache( $this->mTitle );
3902                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3903                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3904                                 $cache->loadFromFileCache();
3905                                 return true;
3906                         } else {
3907                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3908                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3909                         }
3910                 } else {
3911                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3912                 }
3913
3914                 return false;
3915         }
3916
3917         /**
3918          * Check if the page can be cached
3919          * @return bool
3920          */
3921         public function isFileCacheable() {
3922                 $cacheable = false;
3923
3924                 if ( HTMLFileCache::useFileCache() ) {
3925                         $cacheable = $this->getID() && !$this->mRedirectedFrom && !$this->mTitle->isRedirect();
3926                         // Extension may have reason to disable file caching on some pages.
3927                         if ( $cacheable ) {
3928                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3929                         }
3930                 }
3931
3932                 return $cacheable;
3933         }
3934
3935         /**
3936          * Loads page_touched and returns a value indicating if it should be used
3937          * @return boolean true if not a redirect
3938          */
3939         public function checkTouched() {
3940                 if ( !$this->mDataLoaded ) {
3941                         $this->loadPageData();
3942                 }
3943
3944                 return !$this->mIsRedirect;
3945         }
3946
3947         /**
3948          * Get the page_touched field
3949          * @return string containing GMT timestamp
3950          */
3951         public function getTouched() {
3952                 if ( !$this->mDataLoaded ) {
3953                         $this->loadPageData();
3954                 }
3955
3956                 return $this->mTouched;
3957         }
3958
3959         /**
3960          * Get the page_latest field
3961          * @return integer rev_id of current revision
3962          */
3963         public function getLatest() {
3964                 if ( !$this->mDataLoaded ) {
3965                         $this->loadPageData();
3966                 }
3967
3968                 return (int)$this->mLatest;
3969         }
3970
3971         /**
3972          * Edit an article without doing all that other stuff
3973          * The article must already exist; link tables etc
3974          * are not updated, caches are not flushed.
3975          *
3976          * @param $text String: text submitted
3977          * @param $comment String: comment submitted
3978          * @param $minor Boolean: whereas it's a minor modification
3979          */
3980         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3981                 wfProfileIn( __METHOD__ );
3982
3983                 $dbw = wfGetDB( DB_MASTER );
3984                 $revision = new Revision( array(
3985                         'page'       => $this->getId(),
3986                         'text'       => $text,
3987                         'comment'    => $comment,
3988                         'minor_edit' => $minor ? 1 : 0,
3989                         ) );
3990                 $revision->insertOn( $dbw );
3991                 $this->updateRevisionOn( $dbw, $revision );
3992
3993                 global $wgUser;
3994                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3995
3996                 wfProfileOut( __METHOD__ );
3997         }
3998
3999         /**
4000          * Used to increment the view counter
4001          *
4002          * @param $id Integer: article id
4003          */
4004         public static function incViewCount( $id ) {
4005                 $id = intval( $id );
4006
4007                 global $wgHitcounterUpdateFreq;
4008
4009                 $dbw = wfGetDB( DB_MASTER );
4010                 $pageTable = $dbw->tableName( 'page' );
4011                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
4012                 $acchitsTable = $dbw->tableName( 'acchits' );
4013                 $dbType = $dbw->getType();
4014
4015                 if ( $wgHitcounterUpdateFreq <= 1 || $dbType == 'sqlite' ) {
4016                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
4017
4018                         return;
4019                 }
4020
4021                 # Not important enough to warrant an error page in case of failure
4022                 $oldignore = $dbw->ignoreErrors( true );
4023
4024                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
4025
4026                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
4027                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
4028                         # Most of the time (or on SQL errors), skip row count check
4029                         $dbw->ignoreErrors( $oldignore );
4030
4031                         return;
4032                 }
4033
4034                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
4035                 $row = $dbw->fetchObject( $res );
4036                 $rown = intval( $row->n );
4037
4038                 if ( $rown >= $wgHitcounterUpdateFreq ) {
4039                         wfProfileIn( 'Article::incViewCount-collect' );
4040                         $old_user_abort = ignore_user_abort( true );
4041
4042                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
4043                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
4044                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
4045                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
4046                                 'GROUP BY hc_id', __METHOD__ );
4047                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
4048                         $dbw->unlockTables( __METHOD__ );
4049
4050                         if ( $dbType == 'mysql' ) {
4051                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
4052                                         'WHERE page_id = hc_id', __METHOD__ );
4053                         } else {
4054                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
4055                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
4056                         }
4057                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
4058
4059                         ignore_user_abort( $old_user_abort );
4060                         wfProfileOut( 'Article::incViewCount-collect' );
4061                 }
4062
4063                 $dbw->ignoreErrors( $oldignore );
4064         }
4065
4066         /**#@+
4067          * The onArticle*() functions are supposed to be a kind of hooks
4068          * which should be called whenever any of the specified actions
4069          * are done.
4070          *
4071          * This is a good place to put code to clear caches, for instance.
4072          *
4073          * This is called on page move and undelete, as well as edit
4074          *
4075          * @param $title a title object
4076          */
4077         public static function onArticleCreate( $title ) {
4078                 # Update existence markers on article/talk tabs...
4079                 if ( $title->isTalkPage() ) {
4080                         $other = $title->getSubjectPage();
4081                 } else {
4082                         $other = $title->getTalkPage();
4083                 }
4084
4085                 $other->invalidateCache();
4086                 $other->purgeSquid();
4087
4088                 $title->touchLinks();
4089                 $title->purgeSquid();
4090                 $title->deleteTitleProtection();
4091         }
4092
4093         /**
4094          * Clears caches when article is deleted
4095          */
4096         public static function onArticleDelete( $title ) {
4097                 global $wgMessageCache;
4098
4099                 # Update existence markers on article/talk tabs...
4100                 if ( $title->isTalkPage() ) {
4101                         $other = $title->getSubjectPage();
4102                 } else {
4103                         $other = $title->getTalkPage();
4104                 }
4105
4106                 $other->invalidateCache();
4107                 $other->purgeSquid();
4108
4109                 $title->touchLinks();
4110                 $title->purgeSquid();
4111
4112                 # File cache
4113                 HTMLFileCache::clearFileCache( $title );
4114
4115                 # Messages
4116                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4117                         $wgMessageCache->replace( $title->getDBkey(), false );
4118                 }
4119
4120                 # Images
4121                 if ( $title->getNamespace() == NS_FILE ) {
4122                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4123                         $update->doUpdate();
4124                 }
4125
4126                 # User talk pages
4127                 if ( $title->getNamespace() == NS_USER_TALK ) {
4128                         $user = User::newFromName( $title->getText(), false );
4129                         $user->setNewtalk( false );
4130                 }
4131
4132                 # Image redirects
4133                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4134         }
4135
4136         /**
4137          * Purge caches on page update etc
4138          *
4139          * @param $title Title object
4140          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4141          */
4142         public static function onArticleEdit( $title ) {
4143                 global $wgDeferredUpdateList;
4144
4145                 // Invalidate caches of articles which include this page
4146                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4147
4148                 // Invalidate the caches of all pages which redirect here
4149                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4150
4151                 # Purge squid for this page only
4152                 $title->purgeSquid();
4153
4154                 # Clear file cache for this page only
4155                 HTMLFileCache::clearFileCache( $title );
4156         }
4157
4158         /**#@-*/
4159
4160         /**
4161          * Overriden by ImagePage class, only present here to avoid a fatal error
4162          * Called for ?action=revert
4163          */
4164         public function revert() {
4165                 global $wgOut;
4166                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4167         }
4168
4169         /**
4170          * Info about this page
4171          * Called for ?action=info when $wgAllowPageInfo is on.
4172          */
4173         public function info() {
4174                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4175
4176                 if ( !$wgAllowPageInfo ) {
4177                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4178                         return;
4179                 }
4180
4181                 $page = $this->mTitle->getSubjectPage();
4182
4183                 $wgOut->setPagetitle( $page->getPrefixedText() );
4184                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4185                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4186
4187                 if ( !$this->mTitle->exists() ) {
4188                         $wgOut->addHTML( '<div class="noarticletext">' );
4189                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4190                                 // This doesn't quite make sense; the user is asking for
4191                                 // information about the _page_, not the message... -- RC
4192                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
4193                         } else {
4194                                 $msg = $wgUser->isLoggedIn()
4195                                         ? 'noarticletext'
4196                                         : 'noarticletextanon';
4197                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4198                         }
4199
4200                         $wgOut->addHTML( '</div>' );
4201                 } else {
4202                         $dbr = wfGetDB( DB_SLAVE );
4203                         $wl_clause = array(
4204                                 'wl_title'     => $page->getDBkey(),
4205                                 'wl_namespace' => $page->getNamespace() );
4206                         $numwatchers = $dbr->selectField(
4207                                 'watchlist',
4208                                 'COUNT(*)',
4209                                 $wl_clause,
4210                                 __METHOD__,
4211                                 $this->getSelectOptions() );
4212
4213                         $pageInfo = $this->pageCountInfo( $page );
4214                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4215
4216
4217                         //FIXME: unescaped messages
4218                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4219                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4220
4221                         if ( $talkInfo ) {
4222                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4223                         }
4224
4225                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4226
4227                         if ( $talkInfo ) {
4228                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4229                         }
4230
4231                         $wgOut->addHTML( '</ul>' );
4232                 }
4233         }
4234
4235         /**
4236          * Return the total number of edits and number of unique editors
4237          * on a given page. If page does not exist, returns false.
4238          *
4239          * @param $title Title object
4240          * @return mixed array or boolean false
4241          */
4242         public function pageCountInfo( $title ) {
4243                 $id = $title->getArticleId();
4244
4245                 if ( $id == 0 ) {
4246                         return false;
4247                 }
4248
4249                 $dbr = wfGetDB( DB_SLAVE );
4250                 $rev_clause = array( 'rev_page' => $id );
4251                 $edits = $dbr->selectField(
4252                         'revision',
4253                         'COUNT(rev_page)',
4254                         $rev_clause,
4255                         __METHOD__,
4256                         $this->getSelectOptions()
4257                 );
4258                 $authors = $dbr->selectField(
4259                         'revision',
4260                         'COUNT(DISTINCT rev_user_text)',
4261                         $rev_clause,
4262                         __METHOD__,
4263                         $this->getSelectOptions()
4264                 );
4265
4266                 return array( 'edits' => $edits, 'authors' => $authors );
4267         }
4268
4269         /**
4270          * Return a list of templates used by this article.
4271          * Uses the templatelinks table
4272          *
4273          * @return Array of Title objects
4274          */
4275         public function getUsedTemplates() {
4276                 $result = array();
4277                 $id = $this->mTitle->getArticleID();
4278
4279                 if ( $id == 0 ) {
4280                         return array();
4281                 }
4282
4283                 $dbr = wfGetDB( DB_SLAVE );
4284                 $res = $dbr->select( array( 'templatelinks' ),
4285                         array( 'tl_namespace', 'tl_title' ),
4286                         array( 'tl_from' => $id ),
4287                         __METHOD__ );
4288
4289                 if ( $res !== false ) {
4290                         foreach ( $res as $row ) {
4291                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4292                         }
4293                 }
4294
4295                 return $result;
4296         }
4297
4298         /**
4299          * Returns a list of hidden categories this page is a member of.
4300          * Uses the page_props and categorylinks tables.
4301          *
4302          * @return Array of Title objects
4303          */
4304         public function getHiddenCategories() {
4305                 $result = array();
4306                 $id = $this->mTitle->getArticleID();
4307
4308                 if ( $id == 0 ) {
4309                         return array();
4310                 }
4311
4312                 $dbr = wfGetDB( DB_SLAVE );
4313                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4314                         array( 'cl_to' ),
4315                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4316                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4317                         __METHOD__ );
4318
4319                 if ( $res !== false ) {
4320                         foreach ( $res as $row ) {
4321                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4322                         }
4323                 }
4324
4325                 return $result;
4326         }
4327
4328         /**
4329         * Return an applicable autosummary if one exists for the given edit.
4330         * @param $oldtext String: the previous text of the page.
4331         * @param $newtext String: The submitted text of the page.
4332         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4333         * @return string An appropriate autosummary, or an empty string.
4334         */
4335         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4336                 global $wgContLang;
4337
4338                 # Decide what kind of autosummary is needed.
4339
4340                 # Redirect autosummaries
4341                 $ot = Title::newFromRedirect( $oldtext );
4342                 $rt = Title::newFromRedirect( $newtext );
4343
4344                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4345                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4346                 }
4347
4348                 # New page autosummaries
4349                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4350                         # If they're making a new article, give its text, truncated, in the summary.
4351
4352                         $truncatedtext = $wgContLang->truncate(
4353                                 str_replace( "\n", ' ', $newtext ),
4354                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4355
4356                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4357                 }
4358
4359                 # Blanking autosummaries
4360                 if ( $oldtext != '' && $newtext == '' ) {
4361                         return wfMsgForContent( 'autosumm-blank' );
4362                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4363                         # Removing more than 90% of the article
4364
4365                         $truncatedtext = $wgContLang->truncate(
4366                                 $newtext,
4367                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4368
4369                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4370                 }
4371
4372                 # If we reach this point, there's no applicable autosummary for our case, so our
4373                 # autosummary is empty.
4374                 return '';
4375         }
4376
4377         /**
4378          * Add the primary page-view wikitext to the output buffer
4379          * Saves the text into the parser cache if possible.
4380          * Updates templatelinks if it is out of date.
4381          *
4382          * @param $text String
4383          * @param $cache Boolean
4384          * @param $parserOptions mixed ParserOptions object, or boolean false
4385          */
4386         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4387                 global $wgOut;
4388
4389                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4390                 $wgOut->addParserOutput( $this->mParserOutput );
4391         }
4392
4393         /**
4394          * This does all the heavy lifting for outputWikitext, except it returns the parser
4395          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4396          * say, embedding thread pages within a discussion system (LiquidThreads)
4397          *
4398          * @param $text string
4399          * @param $cache boolean
4400          * @param $parserOptions parsing options, defaults to false
4401          * @return string containing parsed output
4402          */
4403         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4404                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4405
4406                 if ( !$parserOptions ) {
4407                         $parserOptions = clone $this->getParserOptions();
4408                 }
4409
4410                 $time = - wfTime();
4411                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4412                         $parserOptions, true, true, $this->getRevIdFetched() );
4413                 $time += wfTime();
4414
4415                 # Timing hack
4416                 if ( $time > 3 ) {
4417                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4418                                 $this->mTitle->getPrefixedDBkey() ) );
4419                 }
4420
4421                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4422                         $parserCache = ParserCache::singleton();
4423                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4424                 }
4425
4426                 // Make sure file cache is not used on uncacheable content.
4427                 // Output that has magic words in it can still use the parser cache
4428                 // (if enabled), though it will generally expire sooner.
4429                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4430                         $wgUseFileCache = false;
4431                 }
4432
4433                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4434
4435                 return $this->mParserOutput;
4436         }
4437
4438         /**
4439          * Get parser options suitable for rendering the primary article wikitext
4440          * @return mixed ParserOptions object or boolean false
4441          */
4442         public function getParserOptions() {
4443                 global $wgUser;
4444
4445                 if ( !$this->mParserOptions ) {
4446                         $this->mParserOptions = new ParserOptions( $wgUser );
4447                         $this->mParserOptions->setTidy( true );
4448                         $this->mParserOptions->enableLimitReport();
4449                 }
4450
4451                 // Clone to allow modifications of the return value without affecting
4452                 // the cache
4453                 return clone $this->mParserOptions;
4454         }
4455
4456         /**
4457          * Updates cascading protections
4458          *
4459          * @param $parserOutput mixed ParserOptions object, or boolean false
4460          **/
4461         protected function doCascadeProtectionUpdates( $parserOutput ) {
4462                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4463                         return;
4464                 }
4465
4466                 // templatelinks table may have become out of sync,
4467                 // especially if using variable-based transclusions.
4468                 // For paranoia, check if things have changed and if
4469                 // so apply updates to the database. This will ensure
4470                 // that cascaded protections apply as soon as the changes
4471                 // are visible.
4472
4473                 # Get templates from templatelinks
4474                 $id = $this->mTitle->getArticleID();
4475
4476                 $tlTemplates = array();
4477
4478                 $dbr = wfGetDB( DB_SLAVE );
4479                 $res = $dbr->select( array( 'templatelinks' ),
4480                         array( 'tl_namespace', 'tl_title' ),
4481                         array( 'tl_from' => $id ),
4482                         __METHOD__
4483                 );
4484
4485                 foreach ( $res as $row ) {
4486                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4487                 }
4488
4489                 # Get templates from parser output.
4490                 $poTemplates = array();
4491                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4492                         foreach ( $templates as $dbk => $id ) {
4493                                 $poTemplates["$ns:$dbk"] = true;
4494                         }
4495                 }
4496
4497                 # Get the diff
4498                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4499
4500                 if ( count( $templates_diff ) > 0 ) {
4501                         # Whee, link updates time.
4502                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4503                         $u->doUpdate();
4504                 }
4505         }
4506
4507         /**
4508          * Update all the appropriate counts in the category table, given that
4509          * we've added the categories $added and deleted the categories $deleted.
4510          *
4511          * @param $added array   The names of categories that were added
4512          * @param $deleted array The names of categories that were deleted
4513          */
4514         public function updateCategoryCounts( $added, $deleted ) {
4515                 $ns = $this->mTitle->getNamespace();
4516                 $dbw = wfGetDB( DB_MASTER );
4517
4518                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4519                 # exist, we might legitimately not create it, but it's simpler to just
4520                 # create it and then give it a negative value, since the value is bogus
4521                 # anyway.
4522                 #
4523                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4524                 $insertCats = array_merge( $added, $deleted );
4525                 if ( !$insertCats ) {
4526                         # Okay, nothing to do
4527                         return;
4528                 }
4529
4530                 $insertRows = array();
4531
4532                 foreach ( $insertCats as $cat ) {
4533                         $insertRows[] = array(
4534                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4535                                 'cat_title' => $cat
4536                         );
4537                 }
4538                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4539
4540                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4541                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4542
4543                 if ( $ns == NS_CATEGORY ) {
4544                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4545                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4546                 } elseif ( $ns == NS_FILE ) {
4547                         $addFields[]    = 'cat_files = cat_files + 1';
4548                         $removeFields[] = 'cat_files = cat_files - 1';
4549                 }
4550
4551                 if ( $added ) {
4552                         $dbw->update(
4553                                 'category',
4554                                 $addFields,
4555                                 array( 'cat_title' => $added ),
4556                                 __METHOD__
4557                         );
4558                 }
4559
4560                 if ( $deleted ) {
4561                         $dbw->update(
4562                                 'category',
4563                                 $removeFields,
4564                                 array( 'cat_title' => $deleted ),
4565                                 __METHOD__
4566                         );
4567                 }
4568         }
4569
4570         /**
4571          * Lightweight method to get the parser output for a page, checking the parser cache
4572          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4573          * consider, so it's not appropriate to use there.
4574          *
4575          * @since 1.16 (r52326) for LiquidThreads
4576          *
4577          * @param $oldid mixed integer Revision ID or null
4578          */
4579         public function getParserOutput( $oldid = null ) {
4580                 global $wgEnableParserCache, $wgUser;
4581
4582                 // Should the parser cache be used?
4583                 $useParserCache = $wgEnableParserCache &&
4584                         $wgUser->getStubThreshold() == 0 &&
4585                         $this->exists() &&
4586                         $oldid === null;
4587
4588                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4589
4590                 if ( $wgUser->getStubThreshold() ) {
4591                         wfIncrStats( 'pcache_miss_stub' );
4592                 }
4593
4594                 $parserOutput = false;
4595                 if ( $useParserCache ) {
4596                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4597                 }
4598
4599                 if ( $parserOutput === false ) {
4600                         // Cache miss; parse and output it.
4601                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4602
4603                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4604                 } else {
4605                         return $parserOutput;
4606                 }
4607         }
4608
4609         // Deprecated methods
4610         /**
4611          * Get the database which should be used for reads
4612          *
4613          * @return Database
4614          * @deprecated - just call wfGetDB( DB_MASTER ) instead
4615          */
4616         function getDB() {
4617                 wfDeprecated( __METHOD__ );
4618                 return wfGetDB( DB_MASTER );
4619         }
4620
4621 }
4622
4623 class PoolWorkArticleView extends PoolCounterWork {
4624         private $mArticle;
4625
4626         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4627                 parent::__construct( 'ArticleView', $key );
4628                 $this->mArticle = $article;
4629                 $this->cacheable = $useParserCache;
4630                 $this->parserOptions = $parserOptions;
4631         }
4632
4633         function doWork() {
4634                 return $this->mArticle->doViewParse();
4635         }
4636
4637         function getCachedWork() {
4638                 global $wgOut;
4639
4640                 $parserCache = ParserCache::singleton();
4641                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4642
4643                 if ( $this->mArticle->mParserOutput !== false ) {
4644                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4645                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4646                         # Ensure that UI elements requiring revision ID have
4647                         # the correct version information.
4648                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4649                         return true;
4650                 }
4651                 return false;
4652         }
4653
4654         function fallback() {
4655                 return $this->mArticle->tryDirtyCache();
4656         }
4657
4658         function error( $status ) {
4659                 global $wgOut;
4660
4661                 $wgOut->clearHTML(); // for release() errors
4662                 $wgOut->enableClientCache( false );
4663                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4664
4665                 $errortext = $status->getWikiText( false, 'view-pool-error' );
4666                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4667
4668                 return false;
4669         }
4670 }