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 is 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 if ( $rt = Title::newFromRedirectArray( $text ) ) {
 988                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 989                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 990                                                 # Don't append the subtitle if this was an old revision
 991                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 992                                                 # Parse just to get categories, displaytitle, etc.
 993                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 994                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 995                                                 $outputDone = true;
 996                                         }
 997                                         break;
 998                                 case 4:
 999                                         # Run the parse, protected by a pool counter
1000                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1001
1002                                         $this->checkTouched();
1003                                         $key = $parserCache->getKey( $this, $parserOptions );
1004                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1005
1006                                         if ( !$poolArticleView->execute() ) {
1007                                                 # Connection or timeout error
1008                                                 wfProfileOut( __METHOD__ );
1009                                                 return;
1010                                         } else {
1011                                                 $outputDone = true;
1012                                         }
1013                                         break;
1014                                 # Should be unreachable, but just in case...
1015                                 default:
1016                                         break 2;
1017                         }
1018                 }
1019
1020                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1021                 if ( $this->mParserOutput ) {
1022                         $titleText = $this->mParserOutput->getTitleText();
1023
1024                         if ( strval( $titleText ) !== '' ) {
1025                                 $wgOut->setPageTitle( $titleText );
1026                         }
1027                 }
1028
1029                 # For the main page, overwrite the <title> element with the con-
1030                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1031                 # that's not empty).
1032                 # This message always exists because it is in the i18n files
1033                 if ( $this->mTitle->equals( Title::newMainPage() )
1034                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
1035                 {
1036                         $wgOut->setHTMLTitle( $m );
1037                 }
1038
1039                 # Now that we've filled $this->mParserOutput, we know whether
1040                 # there are any __NOINDEX__ tags on the page
1041                 $policy = $this->getRobotPolicy( 'view' );
1042                 $wgOut->setIndexPolicy( $policy['index'] );
1043                 $wgOut->setFollowPolicy( $policy['follow'] );
1044
1045                 $this->showViewFooter();
1046                 $this->viewUpdates();
1047                 wfProfileOut( __METHOD__ );
1048         }
1049
1050         /**
1051          * Show a diff page according to current request variables. For use within
1052          * Article::view() only, other callers should use the DifferenceEngine class.
1053          */
1054         public function showDiffPage() {
1055                 global $wgRequest, $wgUser;
1056
1057                 $diff = $wgRequest->getVal( 'diff' );
1058                 $rcid = $wgRequest->getVal( 'rcid' );
1059                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1060                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1061                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1062                 $oldid = $this->getOldID();
1063
1064                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1065                 // DifferenceEngine directly fetched the revision:
1066                 $this->mRevIdFetched = $de->mNewid;
1067                 $de->showDiffPage( $diffOnly );
1068
1069                 // Needed to get the page's current revision
1070                 $this->loadPageData();
1071                 if ( $diff == 0 || $diff == $this->mLatest ) {
1072                         # Run view updates for current revision only
1073                         $this->viewUpdates();
1074                 }
1075         }
1076
1077         /**
1078          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1079          * Article::view() only.
1080          *
1081          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1082          * page views.
1083          */
1084         protected function showCssOrJsPage() {
1085                 global $wgOut;
1086
1087                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1088
1089                 // Give hooks a chance to customise the output
1090                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1091                         // Wrap the whole lot in a <pre> and don't parse
1092                         $m = array();
1093                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1094                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1095                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1096                         $wgOut->addHTML( "\n</pre>\n" );
1097                 }
1098         }
1099
1100         /**
1101          * Get the robot policy to be used for the current view
1102          * @param $action String the action= GET parameter
1103          * @return Array the policy that should be set
1104          * TODO: actions other than 'view'
1105          */
1106         public function getRobotPolicy( $action ) {
1107                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1108                 global $wgDefaultRobotPolicy, $wgRequest;
1109
1110                 $ns = $this->mTitle->getNamespace();
1111
1112                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1113                         # Don't index user and user talk pages for blocked users (bug 11443)
1114                         if ( !$this->mTitle->isSubpage() ) {
1115                                 $block = new Block();
1116                                 if ( $block->load( $this->mTitle->getText() ) ) {
1117                                         return array(
1118                                                 'index'  => 'noindex',
1119                                                 'follow' => 'nofollow'
1120                                         );
1121                                 }
1122                         }
1123                 }
1124
1125                 if ( $this->getID() === 0 || $this->getOldID() ) {
1126                         # Non-articles (special pages etc), and old revisions
1127                         return array(
1128                                 'index'  => 'noindex',
1129                                 'follow' => 'nofollow'
1130                         );
1131                 } elseif ( $wgOut->isPrintable() ) {
1132                         # Discourage indexing of printable versions, but encourage following
1133                         return array(
1134                                 'index'  => 'noindex',
1135                                 'follow' => 'follow'
1136                         );
1137                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1138                         # For ?curid=x urls, disallow indexing
1139                         return array(
1140                                 'index'  => 'noindex',
1141                                 'follow' => 'follow'
1142                         );
1143                 }
1144
1145                 # Otherwise, construct the policy based on the various config variables.
1146                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1147
1148                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1149                         # Honour customised robot policies for this namespace
1150                         $policy = array_merge(
1151                                 $policy,
1152                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1153                         );
1154                 }
1155                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1156                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1157                         # a final sanity check that we have really got the parser output.
1158                         $policy = array_merge(
1159                                 $policy,
1160                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1161                         );
1162                 }
1163
1164                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1165                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1166                         $policy = array_merge(
1167                                 $policy,
1168                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1169                         );
1170                 }
1171
1172                 return $policy;
1173         }
1174
1175         /**
1176          * Converts a String robot policy into an associative array, to allow
1177          * merging of several policies using array_merge().
1178          * @param $policy Mixed, returns empty array on null/false/'', transparent
1179          *            to already-converted arrays, converts String.
1180          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1181          */
1182         public static function formatRobotPolicy( $policy ) {
1183                 if ( is_array( $policy ) ) {
1184                         return $policy;
1185                 } elseif ( !$policy ) {
1186                         return array();
1187                 }
1188
1189                 $policy = explode( ',', $policy );
1190                 $policy = array_map( 'trim', $policy );
1191
1192                 $arr = array();
1193                 foreach ( $policy as $var ) {
1194                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1195                                 $arr['index'] = $var;
1196                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1197                                 $arr['follow'] = $var;
1198                         }
1199                 }
1200
1201                 return $arr;
1202         }
1203
1204         /**
1205          * If this request is a redirect view, send "redirected from" subtitle to
1206          * $wgOut. Returns true if the header was needed, false if this is not a
1207          * redirect view. Handles both local and remote redirects.
1208          *
1209          * @return boolean
1210          */
1211         public function showRedirectedFromHeader() {
1212                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1213
1214                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1215                 $sk = $wgUser->getSkin();
1216
1217                 if ( isset( $this->mRedirectedFrom ) ) {
1218                         // This is an internally redirected page view.
1219                         // We'll need a backlink to the source page for navigation.
1220                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1221                                 $redir = $sk->link(
1222                                         $this->mRedirectedFrom,
1223                                         null,
1224                                         array(),
1225                                         array( 'redirect' => 'no' ),
1226                                         array( 'known', 'noclasses' )
1227                                 );
1228
1229                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1230                                 $wgOut->setSubtitle( $s );
1231
1232                                 // Set the fragment if one was specified in the redirect
1233                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1234                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1235                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1236                                 }
1237
1238                                 // Add a <link rel="canonical"> tag
1239                                 $wgOut->addLink( array( 'rel' => 'canonical',
1240                                         'href' => $this->mTitle->getLocalURL() )
1241                                 );
1242
1243                                 return true;
1244                         }
1245                 } elseif ( $rdfrom ) {
1246                         // This is an externally redirected view, from some other wiki.
1247                         // If it was reported from a trusted site, supply a backlink.
1248                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1249                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1250                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1251                                 $wgOut->setSubtitle( $s );
1252
1253                                 return true;
1254                         }
1255                 }
1256
1257                 return false;
1258         }
1259
1260         /**
1261          * Show a header specific to the namespace currently being viewed, like
1262          * [[MediaWiki:Talkpagetext]]. For Article::view().
1263          */
1264         public function showNamespaceHeader() {
1265                 global $wgOut;
1266
1267                 if ( $this->mTitle->isTalkPage() ) {
1268                         $msg = wfMsgNoTrans( 'talkpageheader' );
1269                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1270                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1271                         }
1272                 }
1273         }
1274
1275         /**
1276          * Show the footer section of an ordinary page view
1277          */
1278         public function showViewFooter() {
1279                 global $wgOut, $wgUseTrackbacks;
1280
1281                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1282                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1283                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1284                 }
1285
1286                 # If we have been passed an &rcid= parameter, we want to give the user a
1287                 # chance to mark this new article as patrolled.
1288                 $this->showPatrolFooter();
1289
1290                 # Trackbacks
1291                 if ( $wgUseTrackbacks ) {
1292                         $this->addTrackbacks();
1293                 }
1294         }
1295
1296         /**
1297          * If patrol is possible, output a patrol UI box. This is called from the
1298          * footer section of ordinary page views. If patrol is not possible or not
1299          * desired, does nothing.
1300          */
1301         public function showPatrolFooter() {
1302                 global $wgOut, $wgRequest, $wgUser;
1303
1304                 $rcid = $wgRequest->getVal( 'rcid' );
1305
1306                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1307                         return;
1308                 }
1309
1310                 $sk = $wgUser->getSkin();
1311                 $token = $wgUser->editToken();
1312
1313                 $wgOut->addHTML(
1314                         "<div class='patrollink'>" .
1315                                 wfMsgHtml(
1316                                         'markaspatrolledlink',
1317                                         $sk->link(
1318                                                 $this->mTitle,
1319                                                 wfMsgHtml( 'markaspatrolledtext' ),
1320                                                 array(),
1321                                                 array(
1322                                                         'action' => 'markpatrolled',
1323                                                         'rcid' => $rcid,
1324                                                         'token' => $token,
1325                                                 ),
1326                                                 array( 'known', 'noclasses' )
1327                                         )
1328                                 ) .
1329                         '</div>'
1330                 );
1331         }
1332
1333         /**
1334          * Show the error text for a missing article. For articles in the MediaWiki
1335          * namespace, show the default message text. To be called from Article::view().
1336          */
1337         public function showMissingArticle() {
1338                 global $wgOut, $wgRequest, $wgUser;
1339
1340                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1341                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1342                         $parts = explode( '/', $this->mTitle->getText() );
1343                         $rootPart = $parts[0];
1344                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1345                         $ip = User::isIP( $rootPart );
1346
1347                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1348                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1349                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1350                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1351                                 LogEventsList::showLogExtract(
1352                                         $wgOut,
1353                                         'block',
1354                                         $user->getUserPage()->getPrefixedText(),
1355                                         '',
1356                                         array(
1357                                                 'lim' => 1,
1358                                                 'showIfEmpty' => false,
1359                                                 'msgKey' => array(
1360                                                         'blocked-notice-logextract',
1361                                                         $user->getName() # Support GENDER in notice
1362                                                 )
1363                                         )
1364                                 );
1365                         }
1366                 }
1367
1368                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1369
1370                 # Show delete and move logs
1371                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1372                         array(  'lim' => 10,
1373                                 'conds' => array( "log_action != 'revision'" ),
1374                                 'showIfEmpty' => false,
1375                                 'msgKey' => array( 'moveddeleted-notice' ) )
1376                 );
1377
1378                 # Show error message
1379                 $oldid = $this->getOldID();
1380                 if ( $oldid ) {
1381                         $text = wfMsgNoTrans( 'missing-article',
1382                                 $this->mTitle->getPrefixedText(),
1383                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1384                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1385                         // Use the default message text
1386                         $text = $this->getContent();
1387                 } else {
1388                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1389                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1390                         $errors = array_merge( $createErrors, $editErrors );
1391
1392                         if ( !count( $errors ) ) {
1393                                 $text = wfMsgNoTrans( 'noarticletext' );
1394                         } else {
1395                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1396                         }
1397                 }
1398                 $text = "<div class='noarticletext'>\n$text\n</div>";
1399
1400                 if ( !$this->hasViewableContent() ) {
1401                         // If there's no backing content, send a 404 Not Found
1402                         // for better machine handling of broken links.
1403                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1404                 }
1405
1406                 $wgOut->addWikiText( $text );
1407         }
1408
1409         /**
1410          * If the revision requested for view is deleted, check permissions.
1411          * Send either an error message or a warning header to $wgOut.
1412          *
1413          * @return boolean true if the view is allowed, false if not.
1414          */
1415         public function showDeletedRevisionHeader() {
1416                 global $wgOut, $wgRequest;
1417
1418                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1419                         // Not deleted
1420                         return true;
1421                 }
1422
1423                 // If the user is not allowed to see it...
1424                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1425                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1426                                 'rev-deleted-text-permission' );
1427
1428                         return false;
1429                 // If the user needs to confirm that they want to see it...
1430                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1431                         # Give explanation and add a link to view the revision...
1432                         $oldid = intval( $this->getOldID() );
1433                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1434                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1435                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1436                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1437                                 array( $msg, $link ) );
1438
1439                         return false;
1440                 // We are allowed to see...
1441                 } else {
1442                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1443                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1444                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1445
1446                         return true;
1447                 }
1448         }
1449
1450         /**
1451          * Should the parser cache be used?
1452          *
1453          * @return boolean
1454          */
1455         public function useParserCache( $oldid ) {
1456                 global $wgUser, $wgEnableParserCache;
1457
1458                 return $wgEnableParserCache
1459                         && $wgUser->getStubThreshold() == 0
1460                         && $this->exists()
1461                         && empty( $oldid )
1462                         && !$this->mTitle->isCssOrJsPage()
1463                         && !$this->mTitle->isCssJsSubpage();
1464         }
1465
1466         /**
1467          * Execute the uncached parse for action=view
1468          */
1469         public function doViewParse() {
1470                 global $wgOut;
1471
1472                 $oldid = $this->getOldID();
1473                 $useParserCache = $this->useParserCache( $oldid );
1474                 $parserOptions = $this->getParserOptions();
1475
1476                 # Render printable version, use printable version cache
1477                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1478
1479                 # Don't show section-edit links on old revisions... this way lies madness.
1480                 if ( !$this->isCurrent() || $wgOut->isPrintable() ) {
1481                         $parserOptions->setEditSection( false );
1482                 }
1483
1484                 $useParserCache = $this->useParserCache( $oldid );
1485                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1486
1487                 return true;
1488         }
1489
1490         /**
1491          * Try to fetch an expired entry from the parser cache. If it is present,
1492          * output it and return true. If it is not present, output nothing and
1493          * return false. This is used as a callback function for
1494          * PoolCounter::executeProtected().
1495          *
1496          * @return boolean
1497          */
1498         public function tryDirtyCache() {
1499                 global $wgOut;
1500                 $parserCache = ParserCache::singleton();
1501                 $options = clone $this->getParserOptions();
1502
1503                 if ( $wgOut->isPrintable() ) {
1504                         $options->setIsPrintable( true );
1505                         $options->setEditSection( false );
1506                 }
1507
1508                 $output = $parserCache->getDirty( $this, $options );
1509
1510                 if ( $output ) {
1511                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1512                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1513                         $wgOut->setSquidMaxage( 0 );
1514                         $this->mParserOutput = $output;
1515                         $wgOut->addParserOutput( $output );
1516                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1517
1518                         return true;
1519                 } else {
1520                         wfDebugLog( 'dirty', "dirty missing\n" );
1521                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1522
1523                         return false;
1524                 }
1525         }
1526
1527         /**
1528          * View redirect
1529          *
1530          * @param $target Title object or Array of destination(s) to redirect
1531          * @param $appendSubtitle Boolean [optional]
1532          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1533          * @return string containing HMTL with redirect link
1534          */
1535         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1536                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1537
1538                 if ( !is_array( $target ) ) {
1539                         $target = array( $target );
1540                 }
1541
1542                 $imageDir = $wgContLang->getDir();
1543
1544                 if ( $appendSubtitle ) {
1545                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1546                 }
1547
1548                 $sk = $wgUser->getSkin();
1549                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1550                 $title = array_shift( $target );
1551
1552                 if ( $forceKnown ) {
1553                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1554                 } else {
1555                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1556                 }
1557
1558                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1559                 $alt = $wgContLang->isRTL() ? '←' : '→';
1560                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1561                 // FIXME: where this happens?
1562                 foreach ( $target as $rt ) {
1563                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1564                         if ( $forceKnown ) {
1565                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText() ) );
1566                         } else {
1567                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1568                         }
1569                 }
1570
1571                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1572                 return Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1573                         '<span class="redirectText">' . $link . '</span>';
1574         }
1575
1576         /**
1577          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1578          */
1579         public function addTrackbacks() {
1580                 global $wgOut, $wgUser;
1581
1582                 $dbr = wfGetDB( DB_SLAVE );
1583                 $tbs = $dbr->select( 'trackbacks',
1584                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1585                         array( 'tb_page' => $this->getID() )
1586                 );
1587
1588                 if ( !$dbr->numRows( $tbs ) ) {
1589                         return;
1590                 }
1591
1592                 $tbtext = "";
1593                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1594                         $rmvtxt = "";
1595
1596                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1597                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1598                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1599                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1600                         }
1601
1602                         $tbtext .= "\n";
1603                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1604                                         $o->tb_title,
1605                                         $o->tb_url,
1606                                         $o->tb_ex,
1607                                         $o->tb_name,
1608                                         $rmvtxt );
1609                 }
1610
1611                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1612         }
1613
1614         /**
1615          * Removes trackback record for current article from trackbacks table
1616          */
1617         public function deletetrackback() {
1618                 global $wgUser, $wgRequest, $wgOut;
1619
1620                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1621                         $wgOut->addWikiMsg( 'sessionfailure' );
1622
1623                         return;
1624                 }
1625
1626                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1627
1628                 if ( count( $permission_errors ) ) {
1629                         $wgOut->showPermissionsErrorPage( $permission_errors );
1630
1631                         return;
1632                 }
1633
1634                 $db = wfGetDB( DB_MASTER );
1635                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1636
1637                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1638                 $this->mTitle->invalidateCache();
1639         }
1640
1641         /**
1642          * Handle action=render
1643          */
1644
1645         public function render() {
1646                 global $wgOut;
1647
1648                 $wgOut->setArticleBodyOnly( true );
1649                 $this->view();
1650         }
1651
1652         /**
1653          * Handle action=purge
1654          */
1655         public function purge() {
1656                 global $wgUser, $wgRequest, $wgOut;
1657
1658                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1659                         //FIXME: shouldn't this be in doPurge()?
1660                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1661                                 $this->doPurge();
1662                                 $this->view();
1663                         }
1664                 } else {
1665                         $formParams = array(
1666                                 'method' => 'post',
1667                                 'action' =>  $wgRequest->getRequestURL(),
1668                         );
1669
1670                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1671
1672                         $form  = Html::openElement( 'form', $formParams );
1673                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1674                         $form .= Html::closeElement( 'form' );
1675
1676                         $wgOut->addHTML( $form );
1677                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1678
1679                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1680                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1681                 }
1682         }
1683
1684         /**
1685          * Perform the actions of a page purging
1686          */
1687         public function doPurge() {
1688                 global $wgUseSquid;
1689
1690                 // Invalidate the cache
1691                 $this->mTitle->invalidateCache();
1692
1693                 if ( $wgUseSquid ) {
1694                         // Commit the transaction before the purge is sent
1695                         $dbw = wfGetDB( DB_MASTER );
1696                         $dbw->commit();
1697
1698                         // Send purge
1699                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1700                         $update->doUpdate();
1701                 }
1702
1703                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1704                         global $wgMessageCache;
1705
1706                         if ( $this->getID() == 0 ) {
1707                                 $text = false;
1708                         } else {
1709                                 $text = $this->getRawText();
1710                         }
1711
1712                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1713                 }
1714         }
1715
1716         /**
1717          * Insert a new empty page record for this article.
1718          * This *must* be followed up by creating a revision
1719          * and running $this->updateRevisionOn( ... );
1720          * or else the record will be left in a funky state.
1721          * Best if all done inside a transaction.
1722          *
1723          * @param $dbw Database
1724          * @return int The newly created page_id key, or false if the title already existed
1725          * @private
1726          */
1727         public function insertOn( $dbw ) {
1728                 wfProfileIn( __METHOD__ );
1729
1730                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1731                 $dbw->insert( 'page', array(
1732                         'page_id'           => $page_id,
1733                         'page_namespace'    => $this->mTitle->getNamespace(),
1734                         'page_title'        => $this->mTitle->getDBkey(),
1735                         'page_counter'      => 0,
1736                         'page_restrictions' => '',
1737                         'page_is_redirect'  => 0, # Will set this shortly...
1738                         'page_is_new'       => 1,
1739                         'page_random'       => wfRandom(),
1740                         'page_touched'      => $dbw->timestamp(),
1741                         'page_latest'       => 0, # Fill this in shortly...
1742                         'page_len'          => 0, # Fill this in shortly...
1743                 ), __METHOD__, 'IGNORE' );
1744
1745                 $affected = $dbw->affectedRows();
1746
1747                 if ( $affected ) {
1748                         $newid = $dbw->insertId();
1749                         $this->mTitle->resetArticleId( $newid );
1750                 }
1751                 wfProfileOut( __METHOD__ );
1752
1753                 return $affected ? $newid : false;
1754         }
1755
1756         /**
1757          * Update the page record to point to a newly saved revision.
1758          *
1759          * @param $dbw Database object
1760          * @param $revision Revision: For ID number, and text used to set
1761                             length and redirect status fields
1762          * @param $lastRevision Integer: if given, will not overwrite the page field
1763          *                      when different from the currently set value.
1764          *                      Giving 0 indicates the new page flag should be set
1765          *                      on.
1766          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1767          *                           removing rows in redirect table.
1768          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1769          *                    Needed when $lastRevision has to be set to sth. !=0
1770          * @return bool true on success, false on failure
1771          * @private
1772          */
1773         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1774                 wfProfileIn( __METHOD__ );
1775
1776                 $text = $revision->getText();
1777                 $rt = Title::newFromRedirectRecurse( $text );
1778
1779                 $conditions = array( 'page_id' => $this->getId() );
1780
1781                 if ( !is_null( $lastRevision ) ) {
1782                         # An extra check against threads stepping on each other
1783                         $conditions['page_latest'] = $lastRevision;
1784                 }
1785
1786                 if ( !$setNewFlag ) {
1787                         $setNewFlag = ( $lastRevision === 0 );
1788                 }
1789
1790                 $dbw->update( 'page',
1791                         array( /* SET */
1792                                 'page_latest'      => $revision->getId(),
1793                                 'page_touched'     => $dbw->timestamp(),
1794                                 'page_is_new'      => $setNewFlag,
1795                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1796                                 'page_len'         => strlen( $text ),
1797                         ),
1798                         $conditions,
1799                         __METHOD__ );
1800
1801                 $result = $dbw->affectedRows() != 0;
1802                 if ( $result ) {
1803                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1804                 }
1805
1806                 wfProfileOut( __METHOD__ );
1807                 return $result;
1808         }
1809
1810         /**
1811          * Add row to the redirect table if this is a redirect, remove otherwise.
1812          *
1813          * @param $dbw Database
1814          * @param $redirectTitle a title object pointing to the redirect target,
1815          *                       or NULL if this is not a redirect
1816          * @param $lastRevIsRedirect If given, will optimize adding and
1817          *                           removing rows in redirect table.
1818          * @return bool true on success, false on failure
1819          * @private
1820          */
1821         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1822                 // Always update redirects (target link might have changed)
1823                 // Update/Insert if we don't know if the last revision was a redirect or not
1824                 // Delete if changing from redirect to non-redirect
1825                 $isRedirect = !is_null( $redirectTitle );
1826
1827                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1828                         wfProfileIn( __METHOD__ );
1829                         if ( $isRedirect ) {
1830                                 $this->insertRedirectEntry( $redirectTitle );
1831                         } else {
1832                                 // This is not a redirect, remove row from redirect table
1833                                 $where = array( 'rd_from' => $this->getId() );
1834                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1835                         }
1836
1837                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1838                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1839                         }
1840                         wfProfileOut( __METHOD__ );
1841
1842                         return ( $dbw->affectedRows() != 0 );
1843                 }
1844
1845                 return true;
1846         }
1847
1848         /**
1849          * If the given revision is newer than the currently set page_latest,
1850          * update the page record. Otherwise, do nothing.
1851          *
1852          * @param $dbw Database object
1853          * @param $revision Revision object
1854          * @return mixed
1855          */
1856         public function updateIfNewerOn( &$dbw, $revision ) {
1857                 wfProfileIn( __METHOD__ );
1858
1859                 $row = $dbw->selectRow(
1860                         array( 'revision', 'page' ),
1861                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1862                         array(
1863                                 'page_id' => $this->getId(),
1864                                 'page_latest=rev_id' ),
1865                         __METHOD__ );
1866
1867                 if ( $row ) {
1868                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1869                                 wfProfileOut( __METHOD__ );
1870                                 return false;
1871                         }
1872                         $prev = $row->rev_id;
1873                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1874                 } else {
1875                         # No or missing previous revision; mark the page as new
1876                         $prev = 0;
1877                         $lastRevIsRedirect = null;
1878                 }
1879
1880                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1881
1882                 wfProfileOut( __METHOD__ );
1883                 return $ret;
1884         }
1885
1886         /**
1887          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1888          * @param $text String: new text of the section
1889          * @param $summary String: new section's subject, only if $section is 'new'
1890          * @param $edittime String: revision timestamp or null to use the current revision
1891          * @return string Complete article text, or null if error
1892          */
1893         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1894                 wfProfileIn( __METHOD__ );
1895
1896                 if ( strval( $section ) == '' ) {
1897                         // Whole-page edit; let the whole text through
1898                 } else {
1899                         if ( is_null( $edittime ) ) {
1900                                 $rev = Revision::newFromTitle( $this->mTitle );
1901                         } else {
1902                                 $dbw = wfGetDB( DB_MASTER );
1903                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1904                         }
1905
1906                         if ( !$rev ) {
1907                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1908                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1909                                 return null;
1910                         }
1911
1912                         $oldtext = $rev->getText();
1913
1914                         if ( $section == 'new' ) {
1915                                 # Inserting a new section
1916                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1917                                 $text = strlen( trim( $oldtext ) ) > 0
1918                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1919                                                 : "{$subject}{$text}";
1920                         } else {
1921                                 # Replacing an existing section; roll out the big guns
1922                                 global $wgParser;
1923
1924                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1925                         }
1926                 }
1927
1928                 wfProfileOut( __METHOD__ );
1929                 return $text;
1930         }
1931
1932         /**
1933          * This function is not deprecated until somebody fixes the core not to use
1934          * it. Nevertheless, use Article::doEdit() instead.
1935          */
1936         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1937                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1938                         ( $isminor ? EDIT_MINOR : 0 ) |
1939                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1940                         ( $bot ? EDIT_FORCE_BOT : 0 );
1941
1942                 # If this is a comment, add the summary as headline
1943                 if ( $comment && $summary != "" ) {
1944                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1945                 }
1946                 $this->doEdit( $text, $summary, $flags );
1947
1948                 $dbw = wfGetDB( DB_MASTER );
1949                 if ( $watchthis ) {
1950                         if ( !$this->mTitle->userIsWatching() ) {
1951                                 $dbw->begin();
1952                                 $this->doWatch();
1953                                 $dbw->commit();
1954                         }
1955                 } else {
1956                         if ( $this->mTitle->userIsWatching() ) {
1957                                 $dbw->begin();
1958                                 $this->doUnwatch();
1959                                 $dbw->commit();
1960                         }
1961                 }
1962                 $this->doRedirect( $this->isRedirect( $text ) );
1963         }
1964
1965         /**
1966          * @deprecated use Article::doEdit()
1967          */
1968         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1969                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1970                         ( $minor ? EDIT_MINOR : 0 ) |
1971                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1972
1973                 $status = $this->doEdit( $text, $summary, $flags );
1974
1975                 if ( !$status->isOK() ) {
1976                         return false;
1977                 }
1978
1979                 $dbw = wfGetDB( DB_MASTER );
1980                 if ( $watchthis ) {
1981                         if ( !$this->mTitle->userIsWatching() ) {
1982                                 $dbw->begin();
1983                                 $this->doWatch();
1984                                 $dbw->commit();
1985                         }
1986                 } else {
1987                         if ( $this->mTitle->userIsWatching() ) {
1988                                 $dbw->begin();
1989                                 $this->doUnwatch();
1990                                 $dbw->commit();
1991                         }
1992                 }
1993
1994                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1995                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1996
1997                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1998                 return true;
1999         }
2000
2001         /**
2002          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
2003          * @param $flags Int
2004          * @return Int updated $flags
2005          */
2006         function checkFlags( $flags ) {
2007                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
2008                         if ( $this->mTitle->getArticleID() ) {
2009                                 $flags |= EDIT_UPDATE;
2010                         } else {
2011                                 $flags |= EDIT_NEW;
2012                         }
2013                 }
2014
2015                 return $flags;
2016         }
2017
2018         /**
2019          * Article::doEdit()
2020          *
2021          * Change an existing article or create a new article. Updates RC and all necessary caches,
2022          * optionally via the deferred update array.
2023          *
2024          * $wgUser must be set before calling this function.
2025          *
2026          * @param $text String: new text
2027          * @param $summary String: edit summary
2028          * @param $flags Integer bitfield:
2029          *      EDIT_NEW
2030          *          Article is known or assumed to be non-existent, create a new one
2031          *      EDIT_UPDATE
2032          *          Article is known or assumed to be pre-existing, update it
2033          *      EDIT_MINOR
2034          *          Mark this edit minor, if the user is allowed to do so
2035          *      EDIT_SUPPRESS_RC
2036          *          Do not log the change in recentchanges
2037          *      EDIT_FORCE_BOT
2038          *          Mark the edit a "bot" edit regardless of user rights
2039          *      EDIT_DEFER_UPDATES
2040          *          Defer some of the updates until the end of index.php
2041          *      EDIT_AUTOSUMMARY
2042          *          Fill in blank summaries with generated text where possible
2043          *
2044          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2045          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2046          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2047          * edit-already-exists error will be returned. These two conditions are also possible with
2048          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2049          *
2050          * @param $baseRevId the revision ID this edit was based off, if any
2051          * @param $user Optional user object, $wgUser will be used if not passed
2052          *
2053          * @return Status object. Possible errors:
2054          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2055          *     edit-gone-missing:       In update mode, but the article didn't exist
2056          *     edit-conflict:           In update mode, the article changed unexpectedly
2057          *     edit-no-change:          Warning that the text was the same as before
2058          *     edit-already-exists:     In creation mode, but the article already exists
2059          *
2060          *  Extensions may define additional errors.
2061          *
2062          *  $return->value will contain an associative array with members as follows:
2063          *     new:                     Boolean indicating if the function attempted to create a new article
2064          *     revision:                The revision object for the inserted revision, or null
2065          *
2066          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2067          */
2068         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2069                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2070
2071                 # Low-level sanity check
2072                 if ( $this->mTitle->getText() === '' ) {
2073                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2074                 }
2075
2076                 wfProfileIn( __METHOD__ );
2077
2078                 $user = is_null( $user ) ? $wgUser : $user;
2079                 $status = Status::newGood( array() );
2080
2081                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2082                 $this->loadPageData();
2083
2084                 $flags = $this->checkFlags( $flags );
2085
2086                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2087                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2088                 {
2089                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2090                         wfProfileOut( __METHOD__ );
2091
2092                         if ( $status->isOK() ) {
2093                                 $status->fatal( 'edit-hook-aborted' );
2094                         }
2095
2096                         return $status;
2097                 }
2098
2099                 # Silently ignore EDIT_MINOR if not allowed
2100                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2101                 $bot = $flags & EDIT_FORCE_BOT;
2102
2103                 $oldtext = $this->getRawText(); // current revision
2104                 $oldsize = strlen( $oldtext );
2105
2106                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2107                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2108                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2109                 }
2110
2111                 $editInfo = $this->prepareTextForEdit( $text );
2112                 $text = $editInfo->pst;
2113                 $newsize = strlen( $text );
2114
2115                 $dbw = wfGetDB( DB_MASTER );
2116                 $now = wfTimestampNow();
2117                 $this->mTimestamp = $now;
2118
2119                 if ( $flags & EDIT_UPDATE ) {
2120                         # Update article, but only if changed.
2121                         $status->value['new'] = false;
2122
2123                         # Make sure the revision is either completely inserted or not inserted at all
2124                         if ( !$wgDBtransactions ) {
2125                                 $userAbort = ignore_user_abort( true );
2126                         }
2127
2128                         $revisionId = 0;
2129
2130                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2131
2132                         if ( $changed ) {
2133                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2134                                   - (int)$this->isCountable( $oldtext );
2135                                 $this->mTotalAdjustment = 0;
2136
2137                                 if ( !$this->mLatest ) {
2138                                         # Article gone missing
2139                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2140                                         $status->fatal( 'edit-gone-missing' );
2141
2142                                         wfProfileOut( __METHOD__ );
2143                                         return $status;
2144                                 }
2145
2146                                 $revision = new Revision( array(
2147                                         'page'       => $this->getId(),
2148                                         'comment'    => $summary,
2149                                         'minor_edit' => $isminor,
2150                                         'text'       => $text,
2151                                         'parent_id'  => $this->mLatest,
2152                                         'user'       => $user->getId(),
2153                                         'user_text'  => $user->getName(),
2154                                 ) );
2155
2156                                 $dbw->begin();
2157                                 $revisionId = $revision->insertOn( $dbw );
2158
2159                                 # Update page
2160                                 #
2161                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2162                                 # during the course of this function. This makes sure that EditPage can detect
2163                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2164                                 # before this function is called. A previous function used a separate query, this
2165                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2166                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2167
2168                                 if ( !$ok ) {
2169                                         /* Belated edit conflict! Run away!! */
2170                                         $status->fatal( 'edit-conflict' );
2171
2172                                         # Delete the invalid revision if the DB is not transactional
2173                                         if ( !$wgDBtransactions ) {
2174                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2175                                         }
2176
2177                                         $revisionId = 0;
2178                                         $dbw->rollback();
2179                                 } else {
2180                                         global $wgUseRCPatrol;
2181                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2182                                         # Update recentchanges
2183                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2184                                                 # Mark as patrolled if the user can do so
2185                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2186                                                 # Add RC row to the DB
2187                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2188                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2189                                                         $revisionId, $patrolled
2190                                                 );
2191
2192                                                 # Log auto-patrolled edits
2193                                                 if ( $patrolled ) {
2194                                                         PatrolLog::record( $rc, true );
2195                                                 }
2196                                         }
2197                                         $user->incEditCount();
2198                                         $dbw->commit();
2199                                 }
2200                         } else {
2201                                 $status->warning( 'edit-no-change' );
2202                                 $revision = null;
2203                                 // Keep the same revision ID, but do some updates on it
2204                                 $revisionId = $this->getRevIdFetched();
2205                                 // Update page_touched, this is usually implicit in the page update
2206                                 // Other cache updates are done in onArticleEdit()
2207                                 $this->mTitle->invalidateCache();
2208                         }
2209
2210                         if ( !$wgDBtransactions ) {
2211                                 ignore_user_abort( $userAbort );
2212                         }
2213
2214                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2215                         if ( !$status->isOK() ) {
2216                                 wfProfileOut( __METHOD__ );
2217                                 return $status;
2218                         }
2219
2220                         # Invalidate cache of this article and all pages using this article
2221                         # as a template. Partly deferred.
2222                         Article::onArticleEdit( $this->mTitle );
2223                         # Update links tables, site stats, etc.
2224                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2225                 } else {
2226                         # Create new article
2227                         $status->value['new'] = true;
2228
2229                         # Set statistics members
2230                         # We work out if it's countable after PST to avoid counter drift
2231                         # when articles are created with {{subst:}}
2232                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2233                         $this->mTotalAdjustment = 1;
2234
2235                         $dbw->begin();
2236
2237                         # Add the page record; stake our claim on this title!
2238                         # This will return false if the article already exists
2239                         $newid = $this->insertOn( $dbw );
2240
2241                         if ( $newid === false ) {
2242                                 $dbw->rollback();
2243                                 $status->fatal( 'edit-already-exists' );
2244
2245                                 wfProfileOut( __METHOD__ );
2246                                 return $status;
2247                         }
2248
2249                         # Save the revision text...
2250                         $revision = new Revision( array(
2251                                 'page'       => $newid,
2252                                 'comment'    => $summary,
2253                                 'minor_edit' => $isminor,
2254                                 'text'       => $text,
2255                                 'user'       => $user->getId(),
2256                                 'user_text'  => $user->getName(),
2257                                 ) );
2258                         $revisionId = $revision->insertOn( $dbw );
2259
2260                         $this->mTitle->resetArticleID( $newid );
2261
2262                         # Update the page record with revision data
2263                         $this->updateRevisionOn( $dbw, $revision, 0 );
2264
2265                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2266
2267                         # Update recentchanges
2268                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2269                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2270
2271                                 # Mark as patrolled if the user can do so
2272                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2273                                 # Add RC row to the DB
2274                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2275                                         '', strlen( $text ), $revisionId, $patrolled );
2276
2277                                 # Log auto-patrolled edits
2278                                 if ( $patrolled ) {
2279                                         PatrolLog::record( $rc, true );
2280                                 }
2281                         }
2282                         $user->incEditCount();
2283                         $dbw->commit();
2284
2285                         # Update links, etc.
2286                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2287
2288                         # Clear caches
2289                         Article::onArticleCreate( $this->mTitle );
2290
2291                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2292                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2293                 }
2294
2295                 # Do updates right now unless deferral was requested
2296                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2297                         wfDoUpdates();
2298                 }
2299
2300                 // Return the new revision (or null) to the caller
2301                 $status->value['revision'] = $revision;
2302
2303                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2304                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2305
2306                 wfProfileOut( __METHOD__ );
2307                 return $status;
2308         }
2309
2310         /**
2311          * @deprecated wrapper for doRedirect
2312          */
2313         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2314                 wfDeprecated( __METHOD__ );
2315                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2316         }
2317
2318         /**
2319          * Output a redirect back to the article.
2320          * This is typically used after an edit.
2321          *
2322          * @param $noRedir Boolean: add redirect=no
2323          * @param $sectionAnchor String: section to redirect to, including "#"
2324          * @param $extraQuery String: extra query params
2325          */
2326         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2327                 global $wgOut;
2328
2329                 if ( $noRedir ) {
2330                         $query = 'redirect=no';
2331                         if ( $extraQuery )
2332                                 $query .= "&$extraQuery";
2333                 } else {
2334                         $query = $extraQuery;
2335                 }
2336
2337                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2338         }
2339
2340         /**
2341          * Mark this particular edit/page as patrolled
2342          */
2343         public function markpatrolled() {
2344                 global $wgOut, $wgUser, $wgRequest;
2345
2346                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2347
2348                 # If we haven't been given an rc_id value, we can't do anything
2349                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2350
2351                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
2352                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2353                         return;
2354                 }
2355
2356                 $rc = RecentChange::newFromId( $rcid );
2357
2358                 if ( is_null( $rc ) ) {
2359                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2360                         return;
2361                 }
2362
2363                 # It would be nice to see where the user had actually come from, but for now just guess
2364                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2365                 $return = SpecialPage::getTitleFor( $returnto );
2366
2367                 $errors = $rc->doMarkPatrolled();
2368
2369                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2370                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2371
2372                         return;
2373                 }
2374
2375                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2376                         // The hook itself has handled any output
2377                         return;
2378                 }
2379
2380                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2381                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2382                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2383                         $wgOut->returnToMain( false, $return );
2384
2385                         return;
2386                 }
2387
2388                 if ( !empty( $errors ) ) {
2389                         $wgOut->showPermissionsErrorPage( $errors );
2390
2391                         return;
2392                 }
2393
2394                 # Inform the user
2395                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2396                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2397                 $wgOut->returnToMain( false, $return );
2398         }
2399
2400         /**
2401          * User-interface handler for the "watch" action
2402          */
2403         public function watch() {
2404                 global $wgUser, $wgOut;
2405
2406                 if ( $wgUser->isAnon() ) {
2407                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2408                         return;
2409                 }
2410
2411                 if ( wfReadOnly() ) {
2412                         $wgOut->readOnlyPage();
2413                         return;
2414                 }
2415
2416                 if ( $this->doWatch() ) {
2417                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2418                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2419                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2420                 }
2421
2422                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2423         }
2424
2425         /**
2426          * Add this page to $wgUser's watchlist
2427          * @return bool true on successful watch operation
2428          */
2429         public function doWatch() {
2430                 global $wgUser;
2431
2432                 if ( $wgUser->isAnon() ) {
2433                         return false;
2434                 }
2435
2436                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2437                         $wgUser->addWatch( $this->mTitle );
2438                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2439                 }
2440
2441                 return false;
2442         }
2443
2444         /**
2445          * User interface handler for the "unwatch" action.
2446          */
2447         public function unwatch() {
2448                 global $wgUser, $wgOut;
2449
2450                 if ( $wgUser->isAnon() ) {
2451                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2452                         return;
2453                 }
2454
2455                 if ( wfReadOnly() ) {
2456                         $wgOut->readOnlyPage();
2457                         return;
2458                 }
2459
2460                 if ( $this->doUnwatch() ) {
2461                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2462                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2463                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2464                 }
2465
2466                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2467         }
2468
2469         /**
2470          * Stop watching a page
2471          * @return bool true on successful unwatch
2472          */
2473         public function doUnwatch() {
2474                 global $wgUser;
2475
2476                 if ( $wgUser->isAnon() ) {
2477                         return false;
2478                 }
2479
2480                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2481                         $wgUser->removeWatch( $this->mTitle );
2482                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2483                 }
2484
2485                 return false;
2486         }
2487
2488         /**
2489          * action=protect handler
2490          */
2491         public function protect() {
2492                 $form = new ProtectionForm( $this );
2493                 $form->execute();
2494         }
2495
2496         /**
2497          * action=unprotect handler (alias)
2498          */
2499         public function unprotect() {
2500                 $this->protect();
2501         }
2502
2503         /**
2504          * Update the article's restriction field, and leave a log entry.
2505          *
2506          * @param $limit Array: set of restriction keys
2507          * @param $reason String
2508          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2509          * @param $expiry Array: per restriction type expiration
2510          * @return bool true on success
2511          */
2512         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2513                 global $wgUser, $wgContLang;
2514
2515                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2516
2517                 $id = $this->mTitle->getArticleID();
2518
2519                 if ( $id <= 0 ) {
2520                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2521                         return false;
2522                 }
2523
2524                 if ( wfReadOnly() ) {
2525                         wfDebug( "updateRestrictions failed: read-only\n" );
2526                         return false;
2527                 }
2528
2529                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2530                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2531                         return false;
2532                 }
2533
2534                 if ( !$cascade ) {
2535                         $cascade = false;
2536                 }
2537
2538                 // Take this opportunity to purge out expired restrictions
2539                 Title::purgeExpiredRestrictions();
2540
2541                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2542                 # we expect a single selection, but the schema allows otherwise.
2543                 $current = array();
2544                 $updated = Article::flattenRestrictions( $limit );
2545                 $changed = false;
2546
2547                 foreach ( $restrictionTypes as $action ) {
2548                         if ( isset( $expiry[$action] ) ) {
2549                                 # Get current restrictions on $action
2550                                 $aLimits = $this->mTitle->getRestrictions( $action );
2551                                 $current[$action] = implode( '', $aLimits );
2552                                 # Are any actual restrictions being dealt with here?
2553                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2554
2555                                 # If something changed, we need to log it. Checking $aRChanged
2556                                 # assures that "unprotecting" a page that is not protected does
2557                                 # not log just because the expiry was "changed".
2558                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2559                                         $changed = true;
2560                                 }
2561                         }
2562                 }
2563
2564                 $current = Article::flattenRestrictions( $current );
2565
2566                 $changed = ( $changed || $current != $updated );
2567                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2568                 $protect = ( $updated != '' );
2569
2570                 # If nothing's changed, do nothing
2571                 if ( $changed ) {
2572                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2573                                 $dbw = wfGetDB( DB_MASTER );
2574
2575                                 # Prepare a null revision to be added to the history
2576                                 $modified = $current != '' && $protect;
2577
2578                                 if ( $protect ) {
2579                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2580                                 } else {
2581                                         $comment_type = 'unprotectedarticle';
2582                                 }
2583
2584                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2585
2586                                 # Only restrictions with the 'protect' right can cascade...
2587                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2588                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2589
2590                                 # The schema allows multiple restrictions
2591                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2592                                         $cascade = false;
2593                                 }
2594
2595                                 $cascade_description = '';
2596
2597                                 if ( $cascade ) {
2598                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2599                                 }
2600
2601                                 if ( $reason ) {
2602                                         $comment .= ": $reason";
2603                                 }
2604
2605                                 $editComment = $comment;
2606                                 $encodedExpiry = array();
2607                                 $protect_description = '';
2608                                 foreach ( $limit as $action => $restrictions ) {
2609                                         if ( !isset( $expiry[$action] ) )
2610                                                 $expiry[$action] = 'infinite';
2611
2612                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2613                                         if ( $restrictions != '' ) {
2614                                                 $protect_description .= "[$action=$restrictions] (";
2615                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2616                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2617                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2618                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2619                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2620                                                 } else {
2621                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2622                                                 }
2623
2624                                                 $protect_description .= ') ';
2625                                         }
2626                                 }
2627                                 $protect_description = trim( $protect_description );
2628
2629                                 if ( $protect_description && $protect ) {
2630                                         $editComment .= " ($protect_description)";
2631                                 }
2632
2633                                 if ( $cascade ) {
2634                                         $editComment .= "$cascade_description";
2635                                 }
2636
2637                                 # Update restrictions table
2638                                 foreach ( $limit as $action => $restrictions ) {
2639                                         if ( $restrictions != '' ) {
2640                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2641                                                         array( 'pr_page' => $id,
2642                                                                 'pr_type' => $action,
2643                                                                 'pr_level' => $restrictions,
2644                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2645                                                                 'pr_expiry' => $encodedExpiry[$action]
2646                                                         ),
2647                                                         __METHOD__
2648                                                 );
2649                                         } else {
2650                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2651                                                         'pr_type' => $action ), __METHOD__ );
2652                                         }
2653                                 }
2654
2655                                 # Insert a null revision
2656                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2657                                 $nullRevId = $nullRevision->insertOn( $dbw );
2658
2659                                 $latest = $this->getLatest();
2660                                 # Update page record
2661                                 $dbw->update( 'page',
2662                                         array( /* SET */
2663                                                 'page_touched' => $dbw->timestamp(),
2664                                                 'page_restrictions' => '',
2665                                                 'page_latest' => $nullRevId
2666                                         ), array( /* WHERE */
2667                                                 'page_id' => $id
2668                                         ), 'Article::protect'
2669                                 );
2670
2671                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2672                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2673
2674                                 # Update the protection log
2675                                 $log = new LogPage( 'protect' );
2676                                 if ( $protect ) {
2677                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2678                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2679                                 } else {
2680                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2681                                 }
2682                         } # End hook
2683                 } # End "changed" check
2684
2685                 return true;
2686         }
2687
2688         /**
2689          * Take an array of page restrictions and flatten it to a string
2690          * suitable for insertion into the page_restrictions field.
2691          * @param $limit Array
2692          * @return String
2693          */
2694         protected static function flattenRestrictions( $limit ) {
2695                 if ( !is_array( $limit ) ) {
2696                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2697                 }
2698
2699                 $bits = array();
2700                 ksort( $limit );
2701
2702                 foreach ( $limit as $action => $restrictions ) {
2703                         if ( $restrictions != '' ) {
2704                                 $bits[] = "$action=$restrictions";
2705                         }
2706                 }
2707
2708                 return implode( ':', $bits );
2709         }
2710
2711         /**
2712          * Auto-generates a deletion reason
2713          *
2714          * @param &$hasHistory Boolean: whether the page has a history
2715          * @return mixed String containing deletion reason or empty string, or boolean false
2716          *    if no revision occurred
2717          */
2718         public function generateReason( &$hasHistory ) {
2719                 global $wgContLang;
2720
2721                 $dbw = wfGetDB( DB_MASTER );
2722                 // Get the last revision
2723                 $rev = Revision::newFromTitle( $this->mTitle );
2724
2725                 if ( is_null( $rev ) ) {
2726                         return false;
2727                 }
2728
2729                 // Get the article's contents
2730                 $contents = $rev->getText();
2731                 $blank = false;
2732
2733                 // If the page is blank, use the text from the previous revision,
2734                 // which can only be blank if there's a move/import/protect dummy revision involved
2735                 if ( $contents == '' ) {
2736                         $prev = $rev->getPrevious();
2737
2738                         if ( $prev )    {
2739                                 $contents = $prev->getText();
2740                                 $blank = true;
2741                         }
2742                 }
2743
2744                 // Find out if there was only one contributor
2745                 // Only scan the last 20 revisions
2746                 $res = $dbw->select( 'revision', 'rev_user_text',
2747                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2748                         __METHOD__,
2749                         array( 'LIMIT' => 20 )
2750                 );
2751
2752                 if ( $res === false ) {
2753                         // This page has no revisions, which is very weird
2754                         return false;
2755                 }
2756
2757                 $hasHistory = ( $res->numRows() > 1 );
2758                 $row = $dbw->fetchObject( $res );
2759
2760                 if ( $row ) { // $row is false if the only contributor is hidden
2761                         $onlyAuthor = $row->rev_user_text;
2762                         // Try to find a second contributor
2763                         foreach ( $res as $row ) {
2764                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2765                                         $onlyAuthor = false;
2766                                         break;
2767                                 }
2768                         }
2769                 } else {
2770                         $onlyAuthor = false;
2771                 }
2772
2773                 // Generate the summary with a '$1' placeholder
2774                 if ( $blank ) {
2775                         // The current revision is blank and the one before is also
2776                         // blank. It's just not our lucky day
2777                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2778                 } else {
2779                         if ( $onlyAuthor ) {
2780                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2781                         } else {
2782                                 $reason = wfMsgForContent( 'excontent', '$1' );
2783                         }
2784                 }
2785
2786                 if ( $reason == '-' ) {
2787                         // Allow these UI messages to be blanked out cleanly
2788                         return '';
2789                 }
2790
2791                 // Replace newlines with spaces to prevent uglyness
2792                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2793                 // Calculate the maximum amount of chars to get
2794                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2795                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2796                 $contents = $wgContLang->truncate( $contents, $maxLength );
2797                 // Remove possible unfinished links
2798                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2799                 // Now replace the '$1' placeholder
2800                 $reason = str_replace( '$1', $contents, $reason );
2801
2802                 return $reason;
2803         }
2804
2805
2806         /*
2807          * UI entry point for page deletion
2808          */
2809         public function delete() {
2810                 global $wgUser, $wgOut, $wgRequest;
2811
2812                 $confirm = $wgRequest->wasPosted() &&
2813                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2814
2815                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2816                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2817
2818                 $reason = $this->DeleteReasonList;
2819
2820                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2821                         // Entry from drop down menu + additional comment
2822                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2823                 } elseif ( $reason == 'other' ) {
2824                         $reason = $this->DeleteReason;
2825                 }
2826
2827                 # Flag to hide all contents of the archived revisions
2828                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2829
2830                 # This code desperately needs to be totally rewritten
2831
2832                 # Read-only check...
2833                 if ( wfReadOnly() ) {
2834                         $wgOut->readOnlyPage();
2835
2836                         return;
2837                 }
2838
2839                 # Check permissions
2840                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2841
2842                 if ( count( $permission_errors ) > 0 ) {
2843                         $wgOut->showPermissionsErrorPage( $permission_errors );
2844
2845                         return;
2846                 }
2847
2848                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2849
2850                 # Better double-check that it hasn't been deleted yet!
2851                 $dbw = wfGetDB( DB_MASTER );
2852                 $conds = $this->mTitle->pageCond();
2853                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2854                 if ( $latest === false ) {
2855                         $wgOut->showFatalError(
2856                                 Html::rawElement(
2857                                         'div',
2858                                         array( 'class' => 'error mw-error-cannotdelete' ),
2859                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2860                                 )
2861                         );
2862                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2863                         LogEventsList::showLogExtract(
2864                                 $wgOut,
2865                                 'delete',
2866                                 $this->mTitle->getPrefixedText()
2867                         );
2868
2869                         return;
2870                 }
2871
2872                 # Hack for big sites
2873                 $bigHistory = $this->isBigDeletion();
2874                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2875                         global $wgLang, $wgDeleteRevisionsLimit;
2876
2877                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2878                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2879
2880                         return;
2881                 }
2882
2883                 if ( $confirm ) {
2884                         $this->doDelete( $reason, $suppress );
2885
2886                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2887                                 $this->doWatch();
2888                         } elseif ( $this->mTitle->userIsWatching() ) {
2889                                 $this->doUnwatch();
2890                         }
2891
2892                         return;
2893                 }
2894
2895                 // Generate deletion reason
2896                 $hasHistory = false;
2897                 if ( !$reason ) {
2898                         $reason = $this->generateReason( $hasHistory );
2899                 }
2900
2901                 // If the page has a history, insert a warning
2902                 if ( $hasHistory && !$confirm ) {
2903                         global $wgLang;
2904
2905                         $skin = $wgUser->getSkin();
2906                         $revisions = $this->estimateRevisionCount();
2907                         //FIXME: lego
2908                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2909                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2910                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2911                                 '</strong>'
2912                         );
2913
2914                         if ( $bigHistory ) {
2915                                 global $wgDeleteRevisionsLimit;
2916                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2917                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2918                         }
2919                 }
2920
2921                 return $this->confirmDelete( $reason );
2922         }
2923
2924         /**
2925          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2926          */
2927         public function isBigDeletion() {
2928                 global $wgDeleteRevisionsLimit;
2929
2930                 if ( $wgDeleteRevisionsLimit ) {
2931                         $revCount = $this->estimateRevisionCount();
2932
2933                         return $revCount > $wgDeleteRevisionsLimit;
2934                 }
2935
2936                 return false;
2937         }
2938
2939         /**
2940          * @return int approximate revision count
2941          */
2942         public function estimateRevisionCount() {
2943                 $dbr = wfGetDB( DB_SLAVE );
2944
2945                 // For an exact count...
2946                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2947                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2948                 return $dbr->estimateRowCount( 'revision', '*',
2949                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2950         }
2951
2952         /**
2953          * Get the last N authors
2954          * @param $num Integer: number of revisions to get
2955          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2956          * @return array Array of authors, duplicates not removed
2957          */
2958         public function getLastNAuthors( $num, $revLatest = 0 ) {
2959                 wfProfileIn( __METHOD__ );
2960                 // First try the slave
2961                 // If that doesn't have the latest revision, try the master
2962                 $continue = 2;
2963                 $db = wfGetDB( DB_SLAVE );
2964
2965                 do {
2966                         $res = $db->select( array( 'page', 'revision' ),
2967                                 array( 'rev_id', 'rev_user_text' ),
2968                                 array(
2969                                         'page_namespace' => $this->mTitle->getNamespace(),
2970                                         'page_title' => $this->mTitle->getDBkey(),
2971                                         'rev_page = page_id'
2972                                 ), __METHOD__, $this->getSelectOptions( array(
2973                                         'ORDER BY' => 'rev_timestamp DESC',
2974                                         'LIMIT' => $num
2975                                 ) )
2976                         );
2977
2978                         if ( !$res ) {
2979                                 wfProfileOut( __METHOD__ );
2980                                 return array();
2981                         }
2982
2983                         $row = $db->fetchObject( $res );
2984
2985                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2986                                 $db = wfGetDB( DB_MASTER );
2987                                 $continue--;
2988                         } else {
2989                                 $continue = 0;
2990                         }
2991                 } while ( $continue );
2992
2993                 $authors = array( $row->rev_user_text );
2994
2995                 while ( $row = $db->fetchObject( $res ) ) {
2996                         $authors[] = $row->rev_user_text;
2997                 }
2998
2999                 wfProfileOut( __METHOD__ );
3000                 return $authors;
3001         }
3002
3003         /**
3004          * Output deletion confirmation dialog
3005          * FIXME: Move to another file?
3006          * @param $reason String: prefilled reason
3007          */
3008         public function confirmDelete( $reason ) {
3009                 global $wgOut, $wgUser;
3010
3011                 wfDebug( "Article::confirmDelete\n" );
3012
3013                 $deleteBackLink = $wgUser->getSkin()->linkKnown( $this->mTitle );
3014                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
3015                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3016                 $wgOut->addWikiMsg( 'confirmdeletetext' );
3017
3018                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
3019
3020                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
3021                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
3022                                         <td></td>
3023                                         <td class='mw-input'><strong>" .
3024                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
3025                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
3026                                         "</strong></td>
3027                                 </tr>";
3028                 } else {
3029                         $suppress = '';
3030                 }
3031                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3032
3033                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3034                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3035                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3036                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3037                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3038                         "<tr id=\"wpDeleteReasonListRow\">
3039                                 <td class='mw-label'>" .
3040                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3041                                 "</td>
3042                                 <td class='mw-input'>" .
3043                                         Xml::listDropDown( 'wpDeleteReasonList',
3044                                                 wfMsgForContent( 'deletereason-dropdown' ),
3045                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3046                                 "</td>
3047                         </tr>
3048                         <tr id=\"wpDeleteReasonRow\">
3049                                 <td class='mw-label'>" .
3050                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3051                                 "</td>
3052                                 <td class='mw-input'>" .
3053                                 Html::input( 'wpReason', $reason, 'text', array(
3054                                         'size' => '60',
3055                                         'maxlength' => '255',
3056                                         'tabindex' => '2',
3057                                         'id' => 'wpReason',
3058                                         'autofocus'
3059                                 ) ) .
3060                                 "</td>
3061                         </tr>";
3062
3063                 # Disallow watching if user is not logged in
3064                 if ( $wgUser->isLoggedIn() ) {
3065                         $form .= "
3066                         <tr>
3067                                 <td></td>
3068                                 <td class='mw-input'>" .
3069                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3070                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3071                                 "</td>
3072                         </tr>";
3073                 }
3074
3075                 $form .= "
3076                         $suppress
3077                         <tr>
3078                                 <td></td>
3079                                 <td class='mw-submit'>" .
3080                                         Xml::submitButton( wfMsg( 'deletepage' ),
3081                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3082                                 "</td>
3083                         </tr>" .
3084                         Xml::closeElement( 'table' ) .
3085                         Xml::closeElement( 'fieldset' ) .
3086                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
3087                         Xml::closeElement( 'form' );
3088
3089                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
3090                                 $skin = $wgUser->getSkin();
3091                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3092                                 $link = $skin->link(
3093                                         $title,
3094                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3095                                         array(),
3096                                         array( 'action' => 'edit' )
3097                                 );
3098                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3099                         }
3100
3101                 $wgOut->addHTML( $form );
3102                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3103                 LogEventsList::showLogExtract( $wgOut, 'delete',
3104                         $this->mTitle->getPrefixedText()
3105                 );
3106         }
3107
3108         /**
3109          * Perform a deletion and output success or failure messages
3110          */
3111         public function doDelete( $reason, $suppress = false ) {
3112                 global $wgOut, $wgUser;
3113
3114                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3115
3116                 $error = '';
3117                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3118                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
3119                                 $deleted = $this->mTitle->getPrefixedText();
3120
3121                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3122                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3123
3124                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3125
3126                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3127                                 $wgOut->returnToMain( false );
3128                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3129                         }
3130                 } else {
3131                         if ( $error == '' ) {
3132                                 $wgOut->showFatalError(
3133                                         Html::rawElement(
3134                                                 'div',
3135                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3136                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3137                                         )
3138                                 );
3139
3140                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3141
3142                                 LogEventsList::showLogExtract(
3143                                         $wgOut,
3144                                         'delete',
3145                                         $this->mTitle->getPrefixedText()
3146                                 );
3147                         } else {
3148                                 $wgOut->showFatalError( $error );
3149                         }
3150                 }
3151         }
3152
3153         /**
3154          * Back-end article deletion
3155          * Deletes the article with database consistency, writes logs, purges caches
3156          *
3157          * @param $reason string delete reason for deletion log
3158          * @param suppress bitfield
3159          *      Revision::DELETED_TEXT
3160          *      Revision::DELETED_COMMENT
3161          *      Revision::DELETED_USER
3162          *      Revision::DELETED_RESTRICTED
3163          * @param $id int article ID
3164          * @param $commit boolean defaults to true, triggers transaction end
3165          * @return boolean true if successful
3166          */
3167         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
3168                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3169
3170                 wfDebug( __METHOD__ . "\n" );
3171
3172                 $dbw = wfGetDB( DB_MASTER );
3173                 $t = $this->mTitle->getDBkey();
3174                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3175
3176                 if ( $t === '' || $id == 0 ) {
3177                         return false;
3178                 }
3179
3180                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3181                 array_push( $wgDeferredUpdateList, $u );
3182
3183                 // Bitfields to further suppress the content
3184                 if ( $suppress ) {
3185                         $bitfield = 0;
3186                         // This should be 15...
3187                         $bitfield |= Revision::DELETED_TEXT;
3188                         $bitfield |= Revision::DELETED_COMMENT;
3189                         $bitfield |= Revision::DELETED_USER;
3190                         $bitfield |= Revision::DELETED_RESTRICTED;
3191                 } else {
3192                         $bitfield = 'rev_deleted';
3193                 }
3194
3195                 $dbw->begin();
3196                 // For now, shunt the revision data into the archive table.
3197                 // Text is *not* removed from the text table; bulk storage
3198                 // is left intact to avoid breaking block-compression or
3199                 // immutable storage schemes.
3200                 //
3201                 // For backwards compatibility, note that some older archive
3202                 // table entries will have ar_text and ar_flags fields still.
3203                 //
3204                 // In the future, we may keep revisions and mark them with
3205                 // the rev_deleted field, which is reserved for this purpose.
3206                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3207                         array(
3208                                 'ar_namespace'  => 'page_namespace',
3209                                 'ar_title'      => 'page_title',
3210                                 'ar_comment'    => 'rev_comment',
3211                                 'ar_user'       => 'rev_user',
3212                                 'ar_user_text'  => 'rev_user_text',
3213                                 'ar_timestamp'  => 'rev_timestamp',
3214                                 'ar_minor_edit' => 'rev_minor_edit',
3215                                 'ar_rev_id'     => 'rev_id',
3216                                 'ar_text_id'    => 'rev_text_id',
3217                                 'ar_text'       => '\'\'', // Be explicit to appease
3218                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3219                                 'ar_len'        => 'rev_len',
3220                                 'ar_page_id'    => 'page_id',
3221                                 'ar_deleted'    => $bitfield
3222                         ), array(
3223                                 'page_id' => $id,
3224                                 'page_id = rev_page'
3225                         ), __METHOD__
3226                 );
3227
3228                 # Delete restrictions for it
3229                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3230
3231                 # Now that it's safely backed up, delete it
3232                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3233                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3234
3235                 if ( !$ok ) {
3236                         $dbw->rollback();
3237                         return false;
3238                 }
3239
3240                 # Fix category table counts
3241                 $cats = array();
3242                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3243
3244                 foreach ( $res as $row ) {
3245                         $cats [] = $row->cl_to;
3246                 }
3247
3248                 $this->updateCategoryCounts( array(), $cats );
3249
3250                 # If using cascading deletes, we can skip some explicit deletes
3251                 if ( !$dbw->cascadingDeletes() ) {
3252                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3253
3254                         if ( $wgUseTrackbacks )
3255                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3256
3257                         # Delete outgoing links
3258                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3259                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3260                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3261                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3262                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3263                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3264                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3265                 }
3266
3267                 # If using cleanup triggers, we can skip some manual deletes
3268                 if ( !$dbw->cleanupTriggers() ) {
3269                         # Clean up recentchanges entries...
3270                         $dbw->delete( 'recentchanges',
3271                                 array( 'rc_type != ' . RC_LOG,
3272                                         'rc_namespace' => $this->mTitle->getNamespace(),
3273                                         'rc_title' => $this->mTitle->getDBkey() ),
3274                                 __METHOD__ );
3275                         $dbw->delete( 'recentchanges',
3276                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3277                                 __METHOD__ );
3278                 }
3279
3280                 # Clear caches
3281                 Article::onArticleDelete( $this->mTitle );
3282
3283                 # Clear the cached article id so the interface doesn't act like we exist
3284                 $this->mTitle->resetArticleID( 0 );
3285
3286                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3287                 $logtype = $suppress ? 'suppress' : 'delete';
3288                 $log = new LogPage( $logtype );
3289
3290                 # Make sure logging got through
3291                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3292
3293                 if ( $commit ) {
3294                         $dbw->commit();
3295                 }
3296
3297                 return true;
3298         }
3299
3300         /**
3301          * Roll back the most recent consecutive set of edits to a page
3302          * from the same user; fails if there are no eligible edits to
3303          * roll back to, e.g. user is the sole contributor. This function
3304          * performs permissions checks on $wgUser, then calls commitRollback()
3305          * to do the dirty work
3306          *
3307          * @param $fromP String: Name of the user whose edits to rollback.
3308          * @param $summary String: Custom summary. Set to default summary if empty.
3309          * @param $token String: Rollback token.
3310          * @param $bot Boolean: If true, mark all reverted edits as bot.
3311          *
3312          * @param $resultDetails Array: contains result-specific array of additional values
3313          *    'alreadyrolled' : 'current' (rev)
3314          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3315          *
3316          * @return array of errors, each error formatted as
3317          *   array(messagekey, param1, param2, ...).
3318          * On success, the array is empty.  This array can also be passed to
3319          * OutputPage::showPermissionsErrorPage().
3320          */
3321         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3322                 global $wgUser;
3323
3324                 $resultDetails = null;
3325
3326                 # Check permissions
3327                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3328                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3329                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3330
3331                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3332                         $errors[] = array( 'sessionfailure' );
3333                 }
3334
3335                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3336                         $errors[] = array( 'actionthrottledtext' );
3337                 }
3338
3339                 # If there were errors, bail out now
3340                 if ( !empty( $errors ) ) {
3341                         return $errors;
3342                 }
3343
3344                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3345         }
3346
3347         /**
3348          * Backend implementation of doRollback(), please refer there for parameter
3349          * and return value documentation
3350          *
3351          * NOTE: This function does NOT check ANY permissions, it just commits the
3352          * rollback to the DB Therefore, you should only call this function direct-
3353          * ly if you want to use custom permissions checks. If you don't, use
3354          * doRollback() instead.
3355          */
3356         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3357                 global $wgUseRCPatrol, $wgUser, $wgLang;
3358
3359                 $dbw = wfGetDB( DB_MASTER );
3360
3361                 if ( wfReadOnly() ) {
3362                         return array( array( 'readonlytext' ) );
3363                 }
3364
3365                 # Get the last editor
3366                 $current = Revision::newFromTitle( $this->mTitle );
3367                 if ( is_null( $current ) ) {
3368                         # Something wrong... no page?
3369                         return array( array( 'notanarticle' ) );
3370                 }
3371
3372                 $from = str_replace( '_', ' ', $fromP );
3373                 # User name given should match up with the top revision.
3374                 # If the user was deleted then $from should be empty.
3375                 if ( $from != $current->getUserText() ) {
3376                         $resultDetails = array( 'current' => $current );
3377                         return array( array( 'alreadyrolled',
3378                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3379                                 htmlspecialchars( $fromP ),
3380                                 htmlspecialchars( $current->getUserText() )
3381                         ) );
3382                 }
3383
3384                 # Get the last edit not by this guy...
3385                 # Note: these may not be public values
3386                 $user = intval( $current->getRawUser() );
3387                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3388                 $s = $dbw->selectRow( 'revision',
3389                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3390                         array( 'rev_page' => $current->getPage(),
3391                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3392                         ), __METHOD__,
3393                         array( 'USE INDEX' => 'page_timestamp',
3394                                 'ORDER BY' => 'rev_timestamp DESC' )
3395                         );
3396                 if ( $s === false ) {
3397                         # No one else ever edited this page
3398                         return array( array( 'cantrollback' ) );
3399                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3400                         # Only admins can see this text
3401                         return array( array( 'notvisiblerev' ) );
3402                 }
3403
3404                 $set = array();
3405                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3406                         # Mark all reverted edits as bot
3407                         $set['rc_bot'] = 1;
3408                 }
3409
3410                 if ( $wgUseRCPatrol ) {
3411                         # Mark all reverted edits as patrolled
3412                         $set['rc_patrolled'] = 1;
3413                 }
3414
3415                 if ( count( $set ) ) {
3416                         $dbw->update( 'recentchanges', $set,
3417                                 array( /* WHERE */
3418                                         'rc_cur_id' => $current->getPage(),
3419                                         'rc_user_text' => $current->getUserText(),
3420                                         "rc_timestamp > '{$s->rev_timestamp}'",
3421                                 ), __METHOD__
3422                         );
3423                 }
3424
3425                 # Generate the edit summary if necessary
3426                 $target = Revision::newFromId( $s->rev_id );
3427                 if ( empty( $summary ) ) {
3428                         if ( $from == '' ) { // no public user name
3429                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3430                         } else {
3431                                 $summary = wfMsgForContent( 'revertpage' );
3432                         }
3433                 }
3434
3435                 # Allow the custom summary to use the same args as the default message
3436                 $args = array(
3437                         $target->getUserText(), $from, $s->rev_id,
3438                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3439                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3440                 );
3441                 $summary = wfMsgReplaceArgs( $summary, $args );
3442
3443                 # Save
3444                 $flags = EDIT_UPDATE;
3445
3446                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3447                         $flags |= EDIT_MINOR;
3448                 }
3449
3450                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) ) {
3451                         $flags |= EDIT_FORCE_BOT;
3452                 }
3453
3454                 # Actually store the edit
3455                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3456                 if ( !empty( $status->value['revision'] ) ) {
3457                         $revId = $status->value['revision']->getId();
3458                 } else {
3459                         $revId = false;
3460                 }
3461
3462                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3463
3464                 $resultDetails = array(
3465                         'summary' => $summary,
3466                         'current' => $current,
3467                         'target'  => $target,
3468                         'newid'   => $revId
3469                 );
3470
3471                 return array();
3472         }
3473
3474         /**
3475          * User interface for rollback operations
3476          */
3477         public function rollback() {
3478                 global $wgUser, $wgOut, $wgRequest;
3479
3480                 $details = null;
3481
3482                 $result = $this->doRollback(
3483                         $wgRequest->getVal( 'from' ),
3484                         $wgRequest->getText( 'summary' ),
3485                         $wgRequest->getVal( 'token' ),
3486                         $wgRequest->getBool( 'bot' ),
3487                         $details
3488                 );
3489
3490                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3491                         $wgOut->rateLimited();
3492                         return;
3493                 }
3494
3495                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3496                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3497                         $errArray = $result[0];
3498                         $errMsg = array_shift( $errArray );
3499                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3500
3501                         if ( isset( $details['current'] ) ) {
3502                                 $current = $details['current'];
3503
3504                                 if ( $current->getComment() != '' ) {
3505                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3506                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3507                                 }
3508                         }
3509
3510                         return;
3511                 }
3512
3513                 # Display permissions errors before read-only message -- there's no
3514                 # point in misleading the user into thinking the inability to rollback
3515                 # is only temporary.
3516                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3517                         # array_diff is completely broken for arrays of arrays, sigh.
3518                         # Remove any 'readonlytext' error manually.
3519                         $out = array();
3520                         foreach ( $result as $error ) {
3521                                 if ( $error != array( 'readonlytext' ) ) {
3522                                         $out [] = $error;
3523                                 }
3524                         }
3525                         $wgOut->showPermissionsErrorPage( $out );
3526
3527                         return;
3528                 }
3529
3530                 if ( $result == array( array( 'readonlytext' ) ) ) {
3531                         $wgOut->readOnlyPage();
3532
3533                         return;
3534                 }
3535
3536                 $current = $details['current'];
3537                 $target = $details['target'];
3538                 $newId = $details['newid'];
3539                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3540                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3541
3542                 if ( $current->getUserText() === '' ) {
3543                         $old = wfMsg( 'rev-deleted-user' );
3544                 } else {
3545                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3546                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3547                 }
3548
3549                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3550                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3551                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3552                 $wgOut->returnToMain( false, $this->mTitle );
3553
3554                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3555                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3556                         $de->showDiff( '', '' );
3557                 }
3558         }
3559
3560         /**
3561          * Do standard deferred updates after page view
3562          */
3563         public function viewUpdates() {
3564                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3565                 if ( wfReadOnly() ) {
3566                         return;
3567                 }
3568
3569                 # Don't update page view counters on views from bot users (bug 14044)
3570                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3571                         Article::incViewCount( $this->getID() );
3572                         $u = new SiteStatsUpdate( 1, 0, 0 );
3573                         array_push( $wgDeferredUpdateList, $u );
3574                 }
3575
3576                 # Update newtalk / watchlist notification status
3577                 $wgUser->clearNotification( $this->mTitle );
3578         }
3579
3580         /**
3581          * Prepare text which is about to be saved.
3582          * Returns a stdclass with source, pst and output members
3583          */
3584         public function prepareTextForEdit( $text, $revid = null ) {
3585                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3586                         // Already prepared
3587                         return $this->mPreparedEdit;
3588                 }
3589
3590                 global $wgParser;
3591
3592                 $edit = (object)array();
3593                 $edit->revid = $revid;
3594                 $edit->newText = $text;
3595                 $edit->pst = $this->preSaveTransform( $text );
3596                 $edit->popts = clone $this->getParserOptions();
3597                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3598                 $edit->oldText = $this->getContent();
3599
3600                 $this->mPreparedEdit = $edit;
3601
3602                 return $edit;
3603         }
3604
3605         /**
3606          * Do standard deferred updates after page edit.
3607          * Update links tables, site stats, search index and message cache.
3608          * Purges pages that include this page if the text was changed here.
3609          * Every 100th edit, prune the recent changes table.
3610          *
3611          * @private
3612          * @param $text New text of the article
3613          * @param $summary Edit summary
3614          * @param $minoredit Minor edit
3615          * @param $timestamp_of_pagechange Timestamp associated with the page change
3616          * @param $newid rev_id value of the new revision
3617          * @param $changed Whether or not the content actually changed
3618          */
3619         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3620                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3621
3622                 wfProfileIn( __METHOD__ );
3623
3624                 # Parse the text
3625                 # Be careful not to double-PST: $text is usually already PST-ed once
3626                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3627                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3628                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3629                 } else {
3630                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3631                         $editInfo = $this->mPreparedEdit;
3632                 }
3633
3634                 # Save it to the parser cache
3635                 if ( $wgEnableParserCache ) {
3636                         $parserCache = ParserCache::singleton();
3637                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3638                 }
3639
3640                 # Update the links tables
3641                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3642                 $u->doUpdate();
3643
3644                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3645
3646                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3647                         if ( 0 == mt_rand( 0, 99 ) ) {
3648                                 // Flush old entries from the `recentchanges` table; we do this on
3649                                 // random requests so as to avoid an increase in writes for no good reason
3650                                 global $wgRCMaxAge;
3651
3652                                 $dbw = wfGetDB( DB_MASTER );
3653                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3654                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3655                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3656
3657                                 $dbw->query( $sql );
3658                         }
3659                 }
3660
3661                 $id = $this->getID();
3662                 $title = $this->mTitle->getPrefixedDBkey();
3663                 $shortTitle = $this->mTitle->getDBkey();
3664
3665                 if ( 0 == $id ) {
3666                         wfProfileOut( __METHOD__ );
3667                         return;
3668                 }
3669
3670                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3671                 array_push( $wgDeferredUpdateList, $u );
3672                 $u = new SearchUpdate( $id, $title, $text );
3673                 array_push( $wgDeferredUpdateList, $u );
3674
3675                 # If this is another user's talk page, update newtalk
3676                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3677                 # load of user talk pages and piss people off, nor if it's a minor edit
3678                 # by a properly-flagged bot.
3679                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3680                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3681                 ) {
3682                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3683                                 $other = User::newFromName( $shortTitle, false );
3684                                 if ( !$other ) {
3685                                         wfDebug( __METHOD__ . ": invalid username\n" );
3686                                 } elseif ( User::isIP( $shortTitle ) ) {
3687                                         // An anonymous user
3688                                         $other->setNewtalk( true );
3689                                 } elseif ( $other->isLoggedIn() ) {
3690                                         $other->setNewtalk( true );
3691                                 } else {
3692                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3693                                 }
3694                         }
3695                 }
3696
3697                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3698                         $wgMessageCache->replace( $shortTitle, $text );
3699                 }
3700
3701                 wfProfileOut( __METHOD__ );
3702         }
3703
3704         /**
3705          * Perform article updates on a special page creation.
3706          *
3707          * @param $rev Revision object
3708          *
3709          * @todo This is a shitty interface function. Kill it and replace the
3710          * other shitty functions like editUpdates and such so it's not needed
3711          * anymore.
3712          */
3713         public function createUpdates( $rev ) {
3714                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3715                 $this->mTotalAdjustment = 1;
3716                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3717                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3718         }
3719
3720         /**
3721          * Generate the navigation links when browsing through an article revisions
3722          * It shows the information as:
3723          *   Revision as of \<date\>; view current revision
3724          *   \<- Previous version | Next Version -\>
3725          *
3726          * @param $oldid String: revision ID of this article revision
3727          */
3728         public function setOldSubtitle( $oldid = 0 ) {
3729                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3730
3731                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3732                         return;
3733                 }
3734
3735                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3736
3737                 # Cascade unhide param in links for easy deletion browsing
3738                 $extraParams = array();
3739                 if ( $wgRequest->getVal( 'unhide' ) ) {
3740                         $extraParams['unhide'] = 1;
3741                 }
3742
3743                 $revision = Revision::newFromId( $oldid );
3744
3745                 $current = ( $oldid == $this->mLatest );
3746                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3747                 $tddate = $wgLang->date( $this->mTimestamp, true );
3748                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3749                 $sk = $wgUser->getSkin();
3750                 $lnk = $current
3751                         ? wfMsgHtml( 'currentrevisionlink' )
3752                         : $sk->link(
3753                                 $this->mTitle,
3754                                 wfMsgHtml( 'currentrevisionlink' ),
3755                                 array(),
3756                                 $extraParams,
3757                                 array( 'known', 'noclasses' )
3758                         );
3759                 $curdiff = $current
3760                         ? wfMsgHtml( 'diff' )
3761                         : $sk->link(
3762                                 $this->mTitle,
3763                                 wfMsgHtml( 'diff' ),
3764                                 array(),
3765                                 array(
3766                                         'diff' => 'cur',
3767                                         'oldid' => $oldid
3768                                 ) + $extraParams,
3769                                 array( 'known', 'noclasses' )
3770                         );
3771                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3772                 $prevlink = $prev
3773                         ? $sk->link(
3774                                 $this->mTitle,
3775                                 wfMsgHtml( 'previousrevision' ),
3776                                 array(),
3777                                 array(
3778                                         'direction' => 'prev',
3779                                         'oldid' => $oldid
3780                                 ) + $extraParams,
3781                                 array( 'known', 'noclasses' )
3782                         )
3783                         : wfMsgHtml( 'previousrevision' );
3784                 $prevdiff = $prev
3785                         ? $sk->link(
3786                                 $this->mTitle,
3787                                 wfMsgHtml( 'diff' ),
3788                                 array(),
3789                                 array(
3790                                         'diff' => 'prev',
3791                                         'oldid' => $oldid
3792                                 ) + $extraParams,
3793                                 array( 'known', 'noclasses' )
3794                         )
3795                         : wfMsgHtml( 'diff' );
3796                 $nextlink = $current
3797                         ? wfMsgHtml( 'nextrevision' )
3798                         : $sk->link(
3799                                 $this->mTitle,
3800                                 wfMsgHtml( 'nextrevision' ),
3801                                 array(),
3802                                 array(
3803                                         'direction' => 'next',
3804                                         'oldid' => $oldid
3805                                 ) + $extraParams,
3806                                 array( 'known', 'noclasses' )
3807                         );
3808                 $nextdiff = $current
3809                         ? wfMsgHtml( 'diff' )
3810                         : $sk->link(
3811                                 $this->mTitle,
3812                                 wfMsgHtml( 'diff' ),
3813                                 array(),
3814                                 array(
3815                                         'diff' => 'next',
3816                                         'oldid' => $oldid
3817                                 ) + $extraParams,
3818                                 array( 'known', 'noclasses' )
3819                         );
3820
3821                 $cdel = '';
3822
3823                 // User can delete revisions or view deleted revisions...
3824                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3825                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3826                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3827                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3828                         } else {
3829                                 $query = array(
3830                                         'type'   => 'revision',
3831                                         'target' => $this->mTitle->getPrefixedDbkey(),
3832                                         'ids'    => $oldid
3833                                 );
3834                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3835                         }
3836                         $cdel .= ' ';
3837                 }
3838
3839                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3840                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3841
3842                 $m = wfMsg( 'revision-info-current' );
3843                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3844                         ? 'revision-info-current'
3845                         : 'revision-info';
3846
3847                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3848                         wfMsgExt(
3849                                 $infomsg,
3850                                 array( 'parseinline', 'replaceafter' ),
3851                                 $td,
3852                                 $userlinks,
3853                                 $revision->getID(),
3854                                 $tddate,
3855                                 $tdtime,
3856                                 $revision->getUser()
3857                         ) .
3858                         "</div>\n" .
3859                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3860                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3861
3862                 $wgOut->setSubtitle( $r );
3863         }
3864
3865         /**
3866          * This function is called right before saving the wikitext,
3867          * so we can do things like signatures and links-in-context.
3868          *
3869          * @param $text String article contents
3870          * @return string article contents with altered wikitext markup (signatures
3871          *      converted, {{subst:}}, templates, etc.)
3872          */
3873         public function preSaveTransform( $text ) {
3874                 global $wgParser, $wgUser;
3875
3876                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3877         }
3878
3879         /* Caching functions */
3880
3881         /**
3882          * checkLastModified returns true if it has taken care of all
3883          * output to the client that is necessary for this request.
3884          * (that is, it has sent a cached version of the page)
3885          *
3886          * @return boolean true if cached version send, false otherwise
3887          */
3888         protected function tryFileCache() {
3889                 static $called = false;
3890
3891                 if ( $called ) {
3892                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3893                         return false;
3894                 }
3895
3896                 $called = true;
3897                 if ( $this->isFileCacheable() ) {
3898                         $cache = new HTMLFileCache( $this->mTitle );
3899                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3900                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3901                                 $cache->loadFromFileCache();
3902                                 return true;
3903                         } else {
3904                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3905                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3906                         }
3907                 } else {
3908                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3909                 }
3910
3911                 return false;
3912         }
3913
3914         /**
3915          * Check if the page can be cached
3916          * @return bool
3917          */
3918         public function isFileCacheable() {
3919                 $cacheable = false;
3920
3921                 if ( HTMLFileCache::useFileCache() ) {
3922                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3923                         // Extension may have reason to disable file caching on some pages.
3924                         if ( $cacheable ) {
3925                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3926                         }
3927                 }
3928
3929                 return $cacheable;
3930         }
3931
3932         /**
3933          * Loads page_touched and returns a value indicating if it should be used
3934          * @return boolean true if not a redirect
3935          */
3936         public function checkTouched() {
3937                 if ( !$this->mDataLoaded ) {
3938                         $this->loadPageData();
3939                 }
3940
3941                 return !$this->mIsRedirect;
3942         }
3943
3944         /**
3945          * Get the page_touched field
3946          * @return string containing GMT timestamp
3947          */
3948         public function getTouched() {
3949                 if ( !$this->mDataLoaded ) {
3950                         $this->loadPageData();
3951                 }
3952
3953                 return $this->mTouched;
3954         }
3955
3956         /**
3957          * Get the page_latest field
3958          * @return integer rev_id of current revision
3959          */
3960         public function getLatest() {
3961                 if ( !$this->mDataLoaded ) {
3962                         $this->loadPageData();
3963                 }
3964
3965                 return (int)$this->mLatest;
3966         }
3967
3968         /**
3969          * Edit an article without doing all that other stuff
3970          * The article must already exist; link tables etc
3971          * are not updated, caches are not flushed.
3972          *
3973          * @param $text String: text submitted
3974          * @param $comment String: comment submitted
3975          * @param $minor Boolean: whereas it's a minor modification
3976          */
3977         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3978                 wfProfileIn( __METHOD__ );
3979
3980                 $dbw = wfGetDB( DB_MASTER );
3981                 $revision = new Revision( array(
3982                         'page'       => $this->getId(),
3983                         'text'       => $text,
3984                         'comment'    => $comment,
3985                         'minor_edit' => $minor ? 1 : 0,
3986                         ) );
3987                 $revision->insertOn( $dbw );
3988                 $this->updateRevisionOn( $dbw, $revision );
3989
3990                 global $wgUser;
3991                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3992
3993                 wfProfileOut( __METHOD__ );
3994         }
3995
3996         /**
3997          * Used to increment the view counter
3998          *
3999          * @param $id Integer: article id
4000          */
4001         public static function incViewCount( $id ) {
4002                 $id = intval( $id );
4003
4004                 global $wgHitcounterUpdateFreq;
4005
4006                 $dbw = wfGetDB( DB_MASTER );
4007                 $pageTable = $dbw->tableName( 'page' );
4008                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
4009                 $acchitsTable = $dbw->tableName( 'acchits' );
4010                 $dbType = $dbw->getType();
4011
4012                 if ( $wgHitcounterUpdateFreq <= 1 || $dbType == 'sqlite' ) {
4013                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
4014
4015                         return;
4016                 }
4017
4018                 # Not important enough to warrant an error page in case of failure
4019                 $oldignore = $dbw->ignoreErrors( true );
4020
4021                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
4022
4023                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
4024                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
4025                         # Most of the time (or on SQL errors), skip row count check
4026                         $dbw->ignoreErrors( $oldignore );
4027
4028                         return;
4029                 }
4030
4031                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
4032                 $row = $dbw->fetchObject( $res );
4033                 $rown = intval( $row->n );
4034
4035                 if ( $rown >= $wgHitcounterUpdateFreq ) {
4036                         wfProfileIn( 'Article::incViewCount-collect' );
4037                         $old_user_abort = ignore_user_abort( true );
4038
4039                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
4040                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
4041                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
4042                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
4043                                 'GROUP BY hc_id', __METHOD__ );
4044                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
4045                         $dbw->unlockTables( __METHOD__ );
4046
4047                         if ( $dbType == 'mysql' ) {
4048                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
4049                                         'WHERE page_id = hc_id', __METHOD__ );
4050                         } else {
4051                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
4052                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
4053                         }
4054                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
4055
4056                         ignore_user_abort( $old_user_abort );
4057                         wfProfileOut( 'Article::incViewCount-collect' );
4058                 }
4059
4060                 $dbw->ignoreErrors( $oldignore );
4061         }
4062
4063         /**#@+
4064          * The onArticle*() functions are supposed to be a kind of hooks
4065          * which should be called whenever any of the specified actions
4066          * are done.
4067          *
4068          * This is a good place to put code to clear caches, for instance.
4069          *
4070          * This is called on page move and undelete, as well as edit
4071          *
4072          * @param $title a title object
4073          */
4074         public static function onArticleCreate( $title ) {
4075                 # Update existence markers on article/talk tabs...
4076                 if ( $title->isTalkPage() ) {
4077                         $other = $title->getSubjectPage();
4078                 } else {
4079                         $other = $title->getTalkPage();
4080                 }
4081
4082                 $other->invalidateCache();
4083                 $other->purgeSquid();
4084
4085                 $title->touchLinks();
4086                 $title->purgeSquid();
4087                 $title->deleteTitleProtection();
4088         }
4089
4090         /**
4091          * Clears caches when article is deleted
4092          */
4093         public static function onArticleDelete( $title ) {
4094                 global $wgMessageCache;
4095
4096                 # Update existence markers on article/talk tabs...
4097                 if ( $title->isTalkPage() ) {
4098                         $other = $title->getSubjectPage();
4099                 } else {
4100                         $other = $title->getTalkPage();
4101                 }
4102
4103                 $other->invalidateCache();
4104                 $other->purgeSquid();
4105
4106                 $title->touchLinks();
4107                 $title->purgeSquid();
4108
4109                 # File cache
4110                 HTMLFileCache::clearFileCache( $title );
4111
4112                 # Messages
4113                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4114                         $wgMessageCache->replace( $title->getDBkey(), false );
4115                 }
4116
4117                 # Images
4118                 if ( $title->getNamespace() == NS_FILE ) {
4119                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4120                         $update->doUpdate();
4121                 }
4122
4123                 # User talk pages
4124                 if ( $title->getNamespace() == NS_USER_TALK ) {
4125                         $user = User::newFromName( $title->getText(), false );
4126                         $user->setNewtalk( false );
4127                 }
4128
4129                 # Image redirects
4130                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4131         }
4132
4133         /**
4134          * Purge caches on page update etc
4135          *
4136          * @param $title Title object
4137          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4138          */
4139         public static function onArticleEdit( $title ) {
4140                 global $wgDeferredUpdateList;
4141
4142                 // Invalidate caches of articles which include this page
4143                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4144
4145                 // Invalidate the caches of all pages which redirect here
4146                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4147
4148                 # Purge squid for this page only
4149                 $title->purgeSquid();
4150
4151                 # Clear file cache for this page only
4152                 HTMLFileCache::clearFileCache( $title );
4153         }
4154
4155         /**#@-*/
4156
4157         /**
4158          * Overriden by ImagePage class, only present here to avoid a fatal error
4159          * Called for ?action=revert
4160          */
4161         public function revert() {
4162                 global $wgOut;
4163                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4164         }
4165
4166         /**
4167          * Info about this page
4168          * Called for ?action=info when $wgAllowPageInfo is on.
4169          */
4170         public function info() {
4171                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4172
4173                 if ( !$wgAllowPageInfo ) {
4174                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4175                         return;
4176                 }
4177
4178                 $page = $this->mTitle->getSubjectPage();
4179
4180                 $wgOut->setPagetitle( $page->getPrefixedText() );
4181                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4182                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4183
4184                 if ( !$this->mTitle->exists() ) {
4185                         $wgOut->addHTML( '<div class="noarticletext">' );
4186                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4187                                 // This doesn't quite make sense; the user is asking for
4188                                 // information about the _page_, not the message... -- RC
4189                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
4190                         } else {
4191                                 $msg = $wgUser->isLoggedIn()
4192                                         ? 'noarticletext'
4193                                         : 'noarticletextanon';
4194                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4195                         }
4196
4197                         $wgOut->addHTML( '</div>' );
4198                 } else {
4199                         $dbr = wfGetDB( DB_SLAVE );
4200                         $wl_clause = array(
4201                                 'wl_title'     => $page->getDBkey(),
4202                                 'wl_namespace' => $page->getNamespace() );
4203                         $numwatchers = $dbr->selectField(
4204                                 'watchlist',
4205                                 'COUNT(*)',
4206                                 $wl_clause,
4207                                 __METHOD__,
4208                                 $this->getSelectOptions() );
4209
4210                         $pageInfo = $this->pageCountInfo( $page );
4211                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4212
4213
4214                         //FIXME: unescaped messages
4215                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4216                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4217
4218                         if ( $talkInfo ) {
4219                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4220                         }
4221
4222                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4223
4224                         if ( $talkInfo ) {
4225                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4226                         }
4227
4228                         $wgOut->addHTML( '</ul>' );
4229                 }
4230         }
4231
4232         /**
4233          * Return the total number of edits and number of unique editors
4234          * on a given page. If page does not exist, returns false.
4235          *
4236          * @param $title Title object
4237          * @return mixed array or boolean false
4238          */
4239         public function pageCountInfo( $title ) {
4240                 $id = $title->getArticleId();
4241
4242                 if ( $id == 0 ) {
4243                         return false;
4244                 }
4245
4246                 $dbr = wfGetDB( DB_SLAVE );
4247                 $rev_clause = array( 'rev_page' => $id );
4248                 $edits = $dbr->selectField(
4249                         'revision',
4250                         'COUNT(rev_page)',
4251                         $rev_clause,
4252                         __METHOD__,
4253                         $this->getSelectOptions()
4254                 );
4255                 $authors = $dbr->selectField(
4256                         'revision',
4257                         'COUNT(DISTINCT rev_user_text)',
4258                         $rev_clause,
4259                         __METHOD__,
4260                         $this->getSelectOptions()
4261                 );
4262
4263                 return array( 'edits' => $edits, 'authors' => $authors );
4264         }
4265
4266         /**
4267          * Return a list of templates used by this article.
4268          * Uses the templatelinks table
4269          *
4270          * @return Array of Title objects
4271          */
4272         public function getUsedTemplates() {
4273                 $result = array();
4274                 $id = $this->mTitle->getArticleID();
4275
4276                 if ( $id == 0 ) {
4277                         return array();
4278                 }
4279
4280                 $dbr = wfGetDB( DB_SLAVE );
4281                 $res = $dbr->select( array( 'templatelinks' ),
4282                         array( 'tl_namespace', 'tl_title' ),
4283                         array( 'tl_from' => $id ),
4284                         __METHOD__ );
4285
4286                 if ( $res !== false ) {
4287                         foreach ( $res as $row ) {
4288                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4289                         }
4290                 }
4291
4292                 return $result;
4293         }
4294
4295         /**
4296          * Returns a list of hidden categories this page is a member of.
4297          * Uses the page_props and categorylinks tables.
4298          *
4299          * @return Array of Title objects
4300          */
4301         public function getHiddenCategories() {
4302                 $result = array();
4303                 $id = $this->mTitle->getArticleID();
4304
4305                 if ( $id == 0 ) {
4306                         return array();
4307                 }
4308
4309                 $dbr = wfGetDB( DB_SLAVE );
4310                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4311                         array( 'cl_to' ),
4312                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4313                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4314                         __METHOD__ );
4315
4316                 if ( $res !== false ) {
4317                         foreach ( $res as $row ) {
4318                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4319                         }
4320                 }
4321
4322                 return $result;
4323         }
4324
4325         /**
4326         * Return an applicable autosummary if one exists for the given edit.
4327         * @param $oldtext String: the previous text of the page.
4328         * @param $newtext String: The submitted text of the page.
4329         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4330         * @return string An appropriate autosummary, or an empty string.
4331         */
4332         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4333                 global $wgContLang;
4334
4335                 # Decide what kind of autosummary is needed.
4336
4337                 # Redirect autosummaries
4338                 $ot = Title::newFromRedirect( $oldtext );
4339                 $rt = Title::newFromRedirect( $newtext );
4340
4341                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4342                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4343                 }
4344
4345                 # New page autosummaries
4346                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4347                         # If they're making a new article, give its text, truncated, in the summary.
4348
4349                         $truncatedtext = $wgContLang->truncate(
4350                                 str_replace( "\n", ' ', $newtext ),
4351                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4352
4353                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4354                 }
4355
4356                 # Blanking autosummaries
4357                 if ( $oldtext != '' && $newtext == '' ) {
4358                         return wfMsgForContent( 'autosumm-blank' );
4359                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4360                         # Removing more than 90% of the article
4361
4362                         $truncatedtext = $wgContLang->truncate(
4363                                 $newtext,
4364                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4365
4366                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4367                 }
4368
4369                 # If we reach this point, there's no applicable autosummary for our case, so our
4370                 # autosummary is empty.
4371                 return '';
4372         }
4373
4374         /**
4375          * Add the primary page-view wikitext to the output buffer
4376          * Saves the text into the parser cache if possible.
4377          * Updates templatelinks if it is out of date.
4378          *
4379          * @param $text String
4380          * @param $cache Boolean
4381          * @param $parserOptions mixed ParserOptions object, or boolean false
4382          */
4383         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4384                 global $wgOut;
4385
4386                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4387                 $wgOut->addParserOutput( $this->mParserOutput );
4388         }
4389
4390         /**
4391          * This does all the heavy lifting for outputWikitext, except it returns the parser
4392          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4393          * say, embedding thread pages within a discussion system (LiquidThreads)
4394          *
4395          * @param $text string
4396          * @param $cache boolean
4397          * @param $parserOptions parsing options, defaults to false
4398          * @return string containing parsed output
4399          */
4400         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4401                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4402
4403                 if ( !$parserOptions ) {
4404                         $parserOptions = clone $this->getParserOptions();
4405                 }
4406
4407                 $time = - wfTime();
4408                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4409                         $parserOptions, true, true, $this->getRevIdFetched() );
4410                 $time += wfTime();
4411
4412                 # Timing hack
4413                 if ( $time > 3 ) {
4414                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4415                                 $this->mTitle->getPrefixedDBkey() ) );
4416                 }
4417
4418                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4419                         $parserCache = ParserCache::singleton();
4420                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4421                 }
4422
4423                 // Make sure file cache is not used on uncacheable content.
4424                 // Output that has magic words in it can still use the parser cache
4425                 // (if enabled), though it will generally expire sooner.
4426                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4427                         $wgUseFileCache = false;
4428                 }
4429
4430                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4431
4432                 return $this->mParserOutput;
4433         }
4434
4435         /**
4436          * Get parser options suitable for rendering the primary article wikitext
4437          * @return mixed ParserOptions object or boolean false
4438          */
4439         public function getParserOptions() {
4440                 global $wgUser;
4441
4442                 if ( !$this->mParserOptions ) {
4443                         $this->mParserOptions = new ParserOptions( $wgUser );
4444                         $this->mParserOptions->setTidy( true );
4445                         $this->mParserOptions->enableLimitReport();
4446                 }
4447
4448                 // Clone to allow modifications of the return value without affecting
4449                 // the cache
4450                 return clone $this->mParserOptions;
4451         }
4452
4453         /**
4454          * Updates cascading protections
4455          *
4456          * @param $parserOutput mixed ParserOptions object, or boolean false
4457          **/
4458
4459         protected function doCascadeProtectionUpdates( $parserOutput ) {
4460                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4461                         return;
4462                 }
4463
4464                 // templatelinks table may have become out of sync,
4465                 // especially if using variable-based transclusions.
4466                 // For paranoia, check if things have changed and if
4467                 // so apply updates to the database. This will ensure
4468                 // that cascaded protections apply as soon as the changes
4469                 // are visible.
4470
4471                 # Get templates from templatelinks
4472                 $id = $this->mTitle->getArticleID();
4473
4474                 $tlTemplates = array();
4475
4476                 $dbr = wfGetDB( DB_SLAVE );
4477                 $res = $dbr->select( array( 'templatelinks' ),
4478                         array( 'tl_namespace', 'tl_title' ),
4479                         array( 'tl_from' => $id ),
4480                         __METHOD__
4481                 );
4482
4483                 foreach ( $res as $row ) {
4484                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4485                 }
4486
4487                 # Get templates from parser output.
4488                 $poTemplates = array();
4489                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4490                         foreach ( $templates as $dbk => $id ) {
4491                                 $poTemplates["$ns:$dbk"] = true;
4492                         }
4493                 }
4494
4495                 # Get the diff
4496                 # Note that we simulate array_diff_key in PHP <5.0.x
4497                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4498
4499                 if ( count( $templates_diff ) > 0 ) {
4500                         # Whee, link updates time.
4501                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4502                         $u->doUpdate();
4503                 }
4504         }
4505
4506         /**
4507          * Update all the appropriate counts in the category table, given that
4508          * we've added the categories $added and deleted the categories $deleted.
4509          *
4510          * @param $added array   The names of categories that were added
4511          * @param $deleted array The names of categories that were deleted
4512          */
4513         public function updateCategoryCounts( $added, $deleted ) {
4514                 $ns = $this->mTitle->getNamespace();
4515                 $dbw = wfGetDB( DB_MASTER );
4516
4517                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4518                 # exist, we might legitimately not create it, but it's simpler to just
4519                 # create it and then give it a negative value, since the value is bogus
4520                 # anyway.
4521                 #
4522                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4523                 $insertCats = array_merge( $added, $deleted );
4524                 if ( !$insertCats ) {
4525                         # Okay, nothing to do
4526                         return;
4527                 }
4528
4529                 $insertRows = array();
4530
4531                 foreach ( $insertCats as $cat ) {
4532                         $insertRows[] = array(
4533                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4534                                 'cat_title' => $cat
4535                         );
4536                 }
4537                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4538
4539                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4540                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4541
4542                 if ( $ns == NS_CATEGORY ) {
4543                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4544                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4545                 } elseif ( $ns == NS_FILE ) {
4546                         $addFields[]    = 'cat_files = cat_files + 1';
4547                         $removeFields[] = 'cat_files = cat_files - 1';
4548                 }
4549
4550                 if ( $added ) {
4551                         $dbw->update(
4552                                 'category',
4553                                 $addFields,
4554                                 array( 'cat_title' => $added ),
4555                                 __METHOD__
4556                         );
4557                 }
4558
4559                 if ( $deleted ) {
4560                         $dbw->update(
4561                                 'category',
4562                                 $removeFields,
4563                                 array( 'cat_title' => $deleted ),
4564                                 __METHOD__
4565                         );
4566                 }
4567         }
4568
4569         /**
4570          * Lightweight method to get the parser output for a page, checking the parser cache
4571          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4572          * consider, so it's not appropriate to use there.
4573          *
4574          * @since 1.16 (r52326) for LiquidThreads
4575          *
4576          * @param $oldid mixed integer Revision ID or null
4577          */
4578         public function getParserOutput( $oldid = null ) {
4579                 global $wgEnableParserCache, $wgUser;
4580
4581                 // Should the parser cache be used?
4582                 $useParserCache = $wgEnableParserCache &&
4583                         $wgUser->getStubThreshold() == 0 &&
4584                         $this->exists() &&
4585                         $oldid === null;
4586
4587                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4588
4589                 if ( $wgUser->getStubThreshold() ) {
4590                         wfIncrStats( 'pcache_miss_stub' );
4591                 }
4592
4593                 $parserOutput = false;
4594                 if ( $useParserCache ) {
4595                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4596                 }
4597
4598                 if ( $parserOutput === false ) {
4599                         // Cache miss; parse and output it.
4600                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4601
4602                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4603                 } else {
4604                         return $parserOutput;
4605                 }
4606         }
4607
4608         // Deprecated methods
4609         /**
4610          * Get the database which should be used for reads
4611          *
4612          * @return Database
4613          * @deprecated - just call wfGetDB( DB_MASTER ) instead
4614          */
4615         function getDB() {
4616                 wfDeprecated( __METHOD__ );
4617                 return wfGetDB( DB_MASTER );
4618         }
4619
4620 }
4621
4622 class PoolWorkArticleView extends PoolCounterWork {
4623         private $mArticle;
4624
4625         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4626                 parent::__construct( __CLASS__, $key );
4627                 $this->mArticle = $article;
4628                 $this->cacheable = $useParserCache;
4629                 $this->parserOptions = $parserOptions;
4630         }
4631
4632         function doWork() {
4633                 return $this->mArticle->doViewParse();
4634         }
4635
4636         function getCachedWork() {
4637                 global $wgOut;
4638
4639                 $parserCache = ParserCache::singleton();
4640                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4641
4642                 if ( $this->mArticle->mParserOutput !== false ) {
4643                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4644                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4645                         # Ensure that UI elements requiring revision ID have
4646                         # the correct version information.
4647                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4648                         return true;
4649                 }
4650                 return false;
4651         }
4652
4653         function fallback() {
4654                 return $this->mArticle->tryDirtyCache();
4655         }
4656
4657         function error( $status ) {
4658                 global $wgOut;
4659
4660                 $wgOut->clearHTML(); // for release() errors
4661                 $wgOut->enableClientCache( false );
4662                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4663
4664                 if ( $status instanceof Status ) {
4665                         $errortext = $status->getWikiText( false, 'view-pool-error' );
4666                 } else {
4667                         $errortext = wfMsgNoTrans( 'view-pool-error', '' );
4668                 }
4669                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4670
4671                 return false;
4672         }
4673 }