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                                 $wgMessageCache->loadAllMessages( $lang );
 264                                 $text = wfMsgGetKey( $message, false, $lang, false );
 265
 266                                 if ( wfEmptyMsg( $message, $text ) )
 267                                         $text = '';
 268                         } else {
 269                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 270                         }
 271                         wfProfileOut( __METHOD__ );
 272
 273                         return $text;
 274                 } else {
 275                         $this->loadContent();
 276                         wfProfileOut( __METHOD__ );
 277
 278                         return $this->mContent;
 279                 }
 280         }
 281
 282         /**
 283          * Get the text of the current revision. No side-effects...
 284          *
 285          * @return Return the text of the current revision
 286          */
 287         public function getRawText() {
 288                 // Check process cache for current revision
 289                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 290                         return $this->mContent;
 291                 }
 292
 293                 $rev = Revision::newFromTitle( $this->mTitle );
 294                 $text = $rev ? $rev->getRawText() : false;
 295
 296                 return $text;
 297         }
 298
 299         /**
 300          * This function returns the text of a section, specified by a number ($section).
 301          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 302          * the first section before any such heading (section 0).
 303          *
 304          * If a section contains subsections, these are also returned.
 305          *
 306          * @param $text String: text to look in
 307          * @param $section Integer: section number
 308          * @return string text of the requested section
 309          * @deprecated
 310          */
 311         public function getSection( $text, $section ) {
 312                 global $wgParser;
 313                 return $wgParser->getSection( $text, $section );
 314         }
 315
 316         /**
 317          * Get the text that needs to be saved in order to undo all revisions
 318          * between $undo and $undoafter. Revisions must belong to the same page,
 319          * must exist and must not be deleted
 320          * @param $undo Revision
 321          * @param $undoafter Revision Must be an earlier revision than $undo
 322          * @return mixed string on success, false on failure
 323          */
 324         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 325                 $undo_text = $undo->getText();
 326                 $undoafter_text = $undoafter->getText();
 327                 $cur_text = $this->getContent();
 328
 329                 if ( $cur_text == $undo_text ) {
 330                         # No use doing a merge if it's just a straight revert.
 331                         return $undoafter_text;
 332                 }
 333
 334                 $undone_text = '';
 335
 336                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 337                         return false;
 338                 }
 339
 340                 return $undone_text;
 341         }
 342
 343         /**
 344          * @return int The oldid of the article that is to be shown, 0 for the
 345          *             current revision
 346          */
 347         public function getOldID() {
 348                 if ( is_null( $this->mOldId ) ) {
 349                         $this->mOldId = $this->getOldIDFromRequest();
 350                 }
 351
 352                 return $this->mOldId;
 353         }
 354
 355         /**
 356          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 357          *
 358          * @return int The old id for the request
 359          */
 360         public function getOldIDFromRequest() {
 361                 global $wgRequest;
 362
 363                 $this->mRedirectUrl = false;
 364
 365                 $oldid = $wgRequest->getVal( 'oldid' );
 366
 367                 if ( isset( $oldid ) ) {
 368                         $oldid = intval( $oldid );
 369                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 370                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 371                                 if ( $nextid ) {
 372                                         $oldid = $nextid;
 373                                 } else {
 374                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 375                                 }
 376                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 377                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 378                                 if ( $previd ) {
 379                                         $oldid = $previd;
 380                                 }
 381                         }
 382                 }
 383
 384                 if ( !$oldid ) {
 385                         $oldid = 0;
 386                 }
 387
 388                 return $oldid;
 389         }
 390
 391         /**
 392          * Load the revision (including text) into this object
 393          */
 394         function loadContent() {
 395                 if ( $this->mContentLoaded ) {
 396                         return;
 397                 }
 398
 399                 wfProfileIn( __METHOD__ );
 400
 401                 $oldid = $this->getOldID();
 402                 $this->mOldId = $oldid;
 403                 $this->fetchContent( $oldid );
 404
 405                 wfProfileOut( __METHOD__ );
 406         }
 407
 408         /**
 409          * Fetch a page record with the given conditions
 410          * @param $dbr Database object
 411          * @param $conditions Array
 412          * @return mixed Database result resource, or false on failure
 413          */
 414         protected function pageData( $dbr, $conditions ) {
 415                 $fields = array(
 416                                 'page_id',
 417                                 'page_namespace',
 418                                 'page_title',
 419                                 'page_restrictions',
 420                                 'page_counter',
 421                                 'page_is_redirect',
 422                                 'page_is_new',
 423                                 'page_random',
 424                                 'page_touched',
 425                                 'page_latest',
 426                                 'page_len',
 427                 );
 428
 429                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 430
 431                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 432
 433                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 434
 435                 return $row;
 436         }
 437
 438         /**
 439          * Fetch a page record matching the Title object's namespace and title
 440          * using a sanitized title string
 441          *
 442          * @param $dbr Database object
 443          * @param $title Title object
 444          * @return mixed Database result resource, or false on failure
 445          */
 446         public function pageDataFromTitle( $dbr, $title ) {
 447                 return $this->pageData( $dbr, array(
 448                         'page_namespace' => $title->getNamespace(),
 449                         'page_title'     => $title->getDBkey() ) );
 450         }
 451
 452         /**
 453          * Fetch a page record matching the requested ID
 454          *
 455          * @param $dbr Database
 456          * @param $id Integer
 457          */
 458         protected function pageDataFromId( $dbr, $id ) {
 459                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 460         }
 461
 462         /**
 463          * Set the general counter, title etc data loaded from
 464          * some source.
 465          *
 466          * @param $data Database row object or "fromdb"
 467          */
 468         public function loadPageData( $data = 'fromdb' ) {
 469                 if ( $data === 'fromdb' ) {
 470                         $dbr = wfGetDB( DB_MASTER );
 471                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 472                 }
 473
 474                 $lc = LinkCache::singleton();
 475
 476                 if ( $data ) {
 477                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 478
 479                         $this->mTitle->mArticleID = intval( $data->page_id );
 480
 481                         # Old-fashioned restrictions
 482                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 483
 484                         $this->mCounter     = intval( $data->page_counter );
 485                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 486                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 487                         $this->mLatest      = intval( $data->page_latest );
 488                 } else {
 489                         $lc->addBadLinkObj( $this->mTitle );
 490                         $this->mTitle->mArticleID = 0;
 491                 }
 492
 493                 $this->mDataLoaded = true;
 494         }
 495
 496         /**
 497          * Get text of an article from database
 498          * Does *NOT* follow redirects.
 499          *
 500          * @param $oldid Int: 0 for whatever the latest revision is
 501          * @return mixed string containing article contents, or false if null
 502          */
 503         function fetchContent( $oldid = 0 ) {
 504                 if ( $this->mContentLoaded ) {
 505                         return $this->mContent;
 506                 }
 507
 508                 $dbr = wfGetDB( DB_MASTER );
 509
 510                 # Pre-fill content with error message so that if something
 511                 # fails we'll have something telling us what we intended.
 512                 $t = $this->mTitle->getPrefixedText();
 513                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 514                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 515
 516                 if ( $oldid ) {
 517                         $revision = Revision::newFromId( $oldid );
 518                         if ( $revision === null ) {
 519                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 520                                 return false;
 521                         }
 522
 523                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 524
 525                         if ( !$data ) {
 526                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 527                                 return false;
 528                         }
 529
 530                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 531                         $this->loadPageData( $data );
 532                 } else {
 533                         if ( !$this->mDataLoaded ) {
 534                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 535
 536                                 if ( !$data ) {
 537                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 538                                         return false;
 539                                 }
 540
 541                                 $this->loadPageData( $data );
 542                         }
 543                         $revision = Revision::newFromId( $this->mLatest );
 544                         if (  $revision === null ) {
 545                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 546                                 return false;
 547                         }
 548                 }
 549
 550                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 551                 // We should instead work with the Revision object when we need it...
 552                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 553
 554                 $this->mUser      = $revision->getUser();
 555                 $this->mUserText  = $revision->getUserText();
 556                 $this->mComment   = $revision->getComment();
 557                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 558
 559                 $this->mRevIdFetched = $revision->getId();
 560                 $this->mContentLoaded = true;
 561                 $this->mRevision =& $revision;
 562
 563                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 564
 565                 return $this->mContent;
 566         }
 567
 568         /**
 569          * Read/write accessor to select FOR UPDATE
 570          *
 571          * @param $x Mixed: FIXME
 572          * @return mixed value of $x, or value stored in Article::mForUpdate
 573          */
 574         public function forUpdate( $x = null ) {
 575                 return wfSetVar( $this->mForUpdate, $x );
 576         }
 577
 578         /**
 579          * Get options for all SELECT statements
 580          *
 581          * @param $options Array: an optional options array which'll be appended to
 582          *                       the default
 583          * @return Array: options
 584          */
 585         protected function getSelectOptions( $options = '' ) {
 586                 if ( $this->mForUpdate ) {
 587                         if ( is_array( $options ) ) {
 588                                 $options[] = 'FOR UPDATE';
 589                         } else {
 590                                 $options = 'FOR UPDATE';
 591                         }
 592                 }
 593
 594                 return $options;
 595         }
 596
 597         /**
 598          * @return int Page ID
 599          */
 600         public function getID() {
 601                 return $this->mTitle->getArticleID();
 602         }
 603
 604         /**
 605          * @return bool Whether or not the page exists in the database
 606          */
 607         public function exists() {
 608                 return $this->getId() > 0;
 609         }
 610
 611         /**
 612          * Check if this page is something we're going to be showing
 613          * some sort of sensible content for. If we return false, page
 614          * views (plain action=view) will return an HTTP 404 response,
 615          * so spiders and robots can know they're following a bad link.
 616          *
 617          * @return bool
 618          */
 619         public function hasViewableContent() {
 620                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 621         }
 622
 623         /**
 624          * @return int The view count for the page
 625          */
 626         public function getCount() {
 627                 if ( -1 == $this->mCounter ) {
 628                         $id = $this->getID();
 629
 630                         if ( $id == 0 ) {
 631                                 $this->mCounter = 0;
 632                         } else {
 633                                 $dbr = wfGetDB( DB_SLAVE );
 634                                 $this->mCounter = $dbr->selectField( 'page',
 635                                         'page_counter',
 636                                         array( 'page_id' => $id ),
 637                                         __METHOD__,
 638                                         $this->getSelectOptions()
 639                                 );
 640                         }
 641                 }
 642
 643                 return $this->mCounter;
 644         }
 645
 646         /**
 647          * Determine whether a page would be suitable for being counted as an
 648          * article in the site_stats table based on the title & its content
 649          *
 650          * @param $text String: text to analyze
 651          * @return bool
 652          */
 653         public function isCountable( $text ) {
 654                 global $wgUseCommaCount;
 655
 656                 $token = $wgUseCommaCount ? ',' : '[[';
 657
 658                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 659         }
 660
 661         /**
 662          * Tests if the article text represents a redirect
 663          *
 664          * @param $text mixed string containing article contents, or boolean
 665          * @return bool
 666          */
 667         public function isRedirect( $text = false ) {
 668                 if ( $text === false ) {
 669                         if ( $this->mDataLoaded ) {
 670                                 return $this->mIsRedirect;
 671                         }
 672
 673                         // Apparently loadPageData was never called
 674                         $this->loadContent();
 675                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 676                 } else {
 677                         $titleObj = Title::newFromRedirect( $text );
 678                 }
 679
 680                 return $titleObj !== null;
 681         }
 682
 683         /**
 684          * Returns true if the currently-referenced revision is the current edit
 685          * to this page (and it exists).
 686          * @return bool
 687          */
 688         public function isCurrent() {
 689                 # If no oldid, this is the current version.
 690                 if ( $this->getOldID() == 0 ) {
 691                         return true;
 692                 }
 693
 694                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 695         }
 696
 697         /**
 698          * Loads everything except the text
 699          * This isn't necessary for all uses, so it's only done if needed.
 700          */
 701         protected function loadLastEdit() {
 702                 if ( -1 != $this->mUser ) {
 703                         return;
 704                 }
 705
 706                 # New or non-existent articles have no user information
 707                 $id = $this->getID();
 708                 if ( 0 == $id ) {
 709                         return;
 710                 }
 711
 712                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 713                 if ( !is_null( $this->mLastRevision ) ) {
 714                         $this->mUser      = $this->mLastRevision->getUser();
 715                         $this->mUserText  = $this->mLastRevision->getUserText();
 716                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 717                         $this->mComment   = $this->mLastRevision->getComment();
 718                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 719                         $this->mRevIdFetched = $this->mLastRevision->getId();
 720                 }
 721         }
 722
 723         /**
 724          * @return string GMT timestamp of last article revision
 725          **/
 726
 727         public function getTimestamp() {
 728                 // Check if the field has been filled by ParserCache::get()
 729                 if ( !$this->mTimestamp ) {
 730                         $this->loadLastEdit();
 731                 }
 732
 733                 return wfTimestamp( TS_MW, $this->mTimestamp );
 734         }
 735
 736         /**
 737          * @return int user ID for the user that made the last article revision
 738          */
 739         public function getUser() {
 740                 $this->loadLastEdit();
 741                 return $this->mUser;
 742         }
 743
 744         /**
 745          * @return string username of the user that made the last article revision
 746          */
 747         public function getUserText() {
 748                 $this->loadLastEdit();
 749                 return $this->mUserText;
 750         }
 751
 752         /**
 753          * @return string Comment stored for the last article revision
 754          */
 755         public function getComment() {
 756                 $this->loadLastEdit();
 757                 return $this->mComment;
 758         }
 759
 760         /**
 761          * Returns true if last revision was marked as "minor edit"
 762          *
 763          * @return boolean Minor edit indicator for the last article revision.
 764          */
 765         public function getMinorEdit() {
 766                 $this->loadLastEdit();
 767                 return $this->mMinorEdit;
 768         }
 769
 770         /**
 771          * Use this to fetch the rev ID used on page views
 772          *
 773          * @return int revision ID of last article revision
 774          */
 775         public function getRevIdFetched() {
 776                 $this->loadLastEdit();
 777                 return $this->mRevIdFetched;
 778         }
 779
 780         /**
 781          * FIXME: this does what?
 782          * @param $limit Integer: default 0.
 783          * @param $offset Integer: default 0.
 784          * @return UserArrayFromResult object with User objects of article contributors for requested range
 785          */
 786         public function getContributors( $limit = 0, $offset = 0 ) {
 787                 # FIXME: this is expensive; cache this info somewhere.
 788
 789                 $dbr = wfGetDB( DB_SLAVE );
 790                 $revTable = $dbr->tableName( 'revision' );
 791                 $userTable = $dbr->tableName( 'user' );
 792
 793                 $pageId = $this->getId();
 794
 795                 $user = $this->getUser();
 796
 797                 if ( $user ) {
 798                         $excludeCond = "AND rev_user != $user";
 799                 } else {
 800                         $userText = $dbr->addQuotes( $this->getUserText() );
 801                         $excludeCond = "AND rev_user_text != $userText";
 802                 }
 803
 804                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 805
 806                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 807                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 808                         WHERE rev_page = $pageId
 809                         $excludeCond
 810                         AND $deletedBit = 0
 811                         GROUP BY rev_user, rev_user_text
 812                         ORDER BY timestamp DESC";
 813
 814                 if ( $limit > 0 ) {
 815                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 816                 }
 817
 818                 $sql .= ' ' . $this->getSelectOptions();
 819                 $res = $dbr->query( $sql, __METHOD__ );
 820
 821                 return new UserArrayFromResult( $res );
 822         }
 823
 824         /**
 825          * This is the default action of the index.php entry point: just view the
 826          * page of the given title.
 827          */
 828         public function view() {
 829                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 830                 global $wgUseFileCache;
 831
 832                 wfProfileIn( __METHOD__ );
 833
 834                 # Get variables from query string
 835                 $oldid = $this->getOldID();
 836                 $parserCache = ParserCache::singleton();
 837
 838                 $parserOptions = clone $this->getParserOptions();
 839                 # Render printable version, use printable version cache
 840                 if ( $wgOut->isPrintable() ) {
 841                         $parserOptions->setIsPrintable( true );
 842                 }
 843
 844                 # Try client and file cache
 845                 if ( $oldid === 0 && $this->checkTouched() ) {
 846                         global $wgUseETag;
 847
 848                         if ( $wgUseETag ) {
 849                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 850                         }
 851
 852                         # Is is client cached?
 853                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 854                                 wfDebug( __METHOD__ . ": done 304\n" );
 855                                 wfProfileOut( __METHOD__ );
 856
 857                                 return;
 858                         # Try file cache
 859                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 860                                 wfDebug( __METHOD__ . ": done file cache\n" );
 861                                 # tell wgOut that output is taken care of
 862                                 $wgOut->disable();
 863                                 $this->viewUpdates();
 864                                 wfProfileOut( __METHOD__ );
 865
 866                                 return;
 867                         }
 868                 }
 869
 870                 # getOldID may want us to redirect somewhere else
 871                 if ( $this->mRedirectUrl ) {
 872                         $wgOut->redirect( $this->mRedirectUrl );
 873                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 874                         wfProfileOut( __METHOD__ );
 875
 876                         return;
 877                 }
 878
 879                 $wgOut->setArticleFlag( true );
 880                 # Set page title (may be overridden by DISPLAYTITLE)
 881                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 882
 883                 # If we got diff in the query, we want to see a diff page instead of the article.
 884                 if ( $wgRequest->getCheck( 'diff' ) ) {
 885                         wfDebug( __METHOD__ . ": showing diff page\n" );
 886                         $this->showDiffPage();
 887                         wfProfileOut( __METHOD__ );
 888
 889                         return;
 890                 }
 891
 892                 # Should the parser cache be used?
 893                 $useParserCache = $this->useParserCache( $oldid );
 894                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 895                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 896                         wfIncrStats( 'pcache_miss_stub' );
 897                 }
 898
 899                 $wasRedirected = $this->showRedirectedFromHeader();
 900                 $this->showNamespaceHeader();
 901
 902                 # Iterate through the possible ways of constructing the output text.
 903                 # Keep going until $outputDone is set, or we run out of things to do.
 904                 $pass = 0;
 905                 $outputDone = false;
 906                 $this->mParserOutput = false;
 907
 908                 while ( !$outputDone && ++$pass ) {
 909                         switch( $pass ) {
 910                                 case 1:
 911                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 912                                         break;
 913                                 case 2:
 914                                         # Try the parser cache
 915                                         if ( $useParserCache ) {
 916                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 917
 918                                                 if ( $this->mParserOutput !== false ) {
 919                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 920                                                         $wgOut->addParserOutput( $this->mParserOutput );
 921                                                         # Ensure that UI elements requiring revision ID have
 922                                                         # the correct version information.
 923                                                         $wgOut->setRevisionId( $this->mLatest );
 924                                                         $outputDone = true;
 925                                                 }
 926                                         }
 927                                         break;
 928                                 case 3:
 929                                         $text = $this->getContent();
 930                                         if ( $text === false || $this->getID() == 0 ) {
 931                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 932                                                 $this->showMissingArticle();
 933                                                 wfProfileOut( __METHOD__ );
 934                                                 return;
 935                                         }
 936
 937                                         # Another whitelist check in case oldid is altering the title
 938                                         if ( !$this->mTitle->userCanRead() ) {
 939                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 940                                                 $wgOut->loginToUse();
 941                                                 $wgOut->output();
 942                                                 $wgOut->disable();
 943                                                 wfProfileOut( __METHOD__ );
 944                                                 return;
 945                                         }
 946
 947                                         # Are we looking at an old revision
 948                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 949                                                 $this->setOldSubtitle( $oldid );
 950
 951                                                 if ( !$this->showDeletedRevisionHeader() ) {
 952                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 953                                                         wfProfileOut( __METHOD__ );
 954                                                         return;
 955                                                 }
 956
 957                                                 # If this "old" version is the current, then try the parser cache...
 958                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 959                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 960                                                         if ( $this->mParserOutput ) {
 961                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 962                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 963                                                                 $wgOut->setRevisionId( $this->mLatest );
 964                                                                 $this->showViewFooter();
 965                                                                 $this->viewUpdates();
 966                                                                 wfProfileOut( __METHOD__ );
 967                                                                 return;
 968                                                         }
 969                                                 }
 970                                         }
 971
 972                                         # Ensure that UI elements requiring revision ID have
 973                                         # the correct version information.
 974                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 975
 976                                         # Pages containing custom CSS or JavaScript get special treatment
 977                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 978                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 979                                                 $this->showCssOrJsPage();
 980                                                 $outputDone = true;
 981                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 982                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 983                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 984                                                 # Don't append the subtitle if this was an old revision
 985                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 986                                                 # Parse just to get categories, displaytitle, etc.
 987                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 988                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 989                                                 $outputDone = true;
 990                                         }
 991                                         break;
 992                                 case 4:
 993                                         # Run the parse, protected by a pool counter
 994                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 995                                         $key = $parserCache->getKey( $this, $parserOptions );
 996                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 997                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 998                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 999
1000                                         if ( !$status->isOK() ) {
1001                                                 # Connection or timeout error
1002                                                 $this->showPoolError( $status );
1003                                                 wfProfileOut( __METHOD__ );
1004                                                 return;
1005                                         } else {
1006                                                 $outputDone = true;
1007                                         }
1008                                         break;
1009                                 # Should be unreachable, but just in case...
1010                                 default:
1011                                         break 2;
1012                         }
1013                 }
1014
1015                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1016                 if ( $this->mParserOutput ) {
1017                         $titleText = $this->mParserOutput->getTitleText();
1018
1019                         if ( strval( $titleText ) !== '' ) {
1020                                 $wgOut->setPageTitle( $titleText );
1021                         }
1022                 }
1023
1024                 # For the main page, overwrite the <title> element with the con-
1025                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1026                 # that's not empty).
1027                 # This message always exists because it is in the i18n files
1028                 if ( $this->mTitle->equals( Title::newMainPage() )
1029                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
1030                 {
1031                         $wgOut->setHTMLTitle( $m );
1032                 }
1033
1034                 # Now that we've filled $this->mParserOutput, we know whether
1035                 # there are any __NOINDEX__ tags on the page
1036                 $policy = $this->getRobotPolicy( 'view' );
1037                 $wgOut->setIndexPolicy( $policy['index'] );
1038                 $wgOut->setFollowPolicy( $policy['follow'] );
1039
1040                 $this->showViewFooter();
1041                 $this->viewUpdates();
1042                 wfProfileOut( __METHOD__ );
1043         }
1044
1045         /**
1046          * Show a diff page according to current request variables. For use within
1047          * Article::view() only, other callers should use the DifferenceEngine class.
1048          */
1049         public function showDiffPage() {
1050                 global $wgRequest, $wgUser;
1051
1052                 $diff = $wgRequest->getVal( 'diff' );
1053                 $rcid = $wgRequest->getVal( 'rcid' );
1054                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1055                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1056                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1057                 $oldid = $this->getOldID();
1058
1059                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1060                 // DifferenceEngine directly fetched the revision:
1061                 $this->mRevIdFetched = $de->mNewid;
1062                 $de->showDiffPage( $diffOnly );
1063
1064                 // Needed to get the page's current revision
1065                 $this->loadPageData();
1066                 if ( $diff == 0 || $diff == $this->mLatest ) {
1067                         # Run view updates for current revision only
1068                         $this->viewUpdates();
1069                 }
1070         }
1071
1072         /**
1073          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1074          * Article::view() only.
1075          *
1076          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1077          * page views.
1078          */
1079         public function showCssOrJsPage() {
1080                 global $wgOut;
1081
1082                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1083
1084                 // Give hooks a chance to customise the output
1085                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1086                         // Wrap the whole lot in a <pre> and don't parse
1087                         $m = array();
1088                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1089                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1090                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1091                         $wgOut->addHTML( "\n</pre>\n" );
1092                 }
1093         }
1094
1095         /**
1096          * Get the robot policy to be used for the current action=view request.
1097          * @return String the policy that should be set
1098          * @deprecated use getRobotPolicy() instead, which returns an associative
1099          *    array
1100          */
1101         public function getRobotPolicyForView() {
1102                 wfDeprecated( __METHOD__ );
1103                 $policy = $this->getRobotPolicy( 'view' );
1104
1105                 return $policy['index'] . ',' . $policy['follow'];
1106         }
1107
1108         /**
1109          * Get the robot policy to be used for the current view
1110          * @param $action String the action= GET parameter
1111          * @return Array the policy that should be set
1112          * TODO: actions other than 'view'
1113          */
1114         public function getRobotPolicy( $action ) {
1115                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1116                 global $wgDefaultRobotPolicy, $wgRequest;
1117
1118                 $ns = $this->mTitle->getNamespace();
1119
1120                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1121                         # Don't index user and user talk pages for blocked users (bug 11443)
1122                         if ( !$this->mTitle->isSubpage() ) {
1123                                 $block = new Block();
1124                                 if ( $block->load( $this->mTitle->getText() ) ) {
1125                                         return array(
1126                                                 'index'  => 'noindex',
1127                                                 'follow' => 'nofollow'
1128                                         );
1129                                 }
1130                         }
1131                 }
1132
1133                 if ( $this->getID() === 0 || $this->getOldID() ) {
1134                         # Non-articles (special pages etc), and old revisions
1135                         return array(
1136                                 'index'  => 'noindex',
1137                                 'follow' => 'nofollow'
1138                         );
1139                 } elseif ( $wgOut->isPrintable() ) {
1140                         # Discourage indexing of printable versions, but encourage following
1141                         return array(
1142                                 'index'  => 'noindex',
1143                                 'follow' => 'follow'
1144                         );
1145                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1146                         # For ?curid=x urls, disallow indexing
1147                         return array(
1148                                 'index'  => 'noindex',
1149                                 'follow' => 'follow'
1150                         );
1151                 }
1152
1153                 # Otherwise, construct the policy based on the various config variables.
1154                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1155
1156                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1157                         # Honour customised robot policies for this namespace
1158                         $policy = array_merge(
1159                                 $policy,
1160                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1161                         );
1162                 }
1163                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1164                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1165                         # a final sanity check that we have really got the parser output.
1166                         $policy = array_merge(
1167                                 $policy,
1168                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1169                         );
1170                 }
1171
1172                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1173                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1174                         $policy = array_merge(
1175                                 $policy,
1176                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1177                         );
1178                 }
1179
1180                 return $policy;
1181         }
1182
1183         /**
1184          * Converts a String robot policy into an associative array, to allow
1185          * merging of several policies using array_merge().
1186          * @param $policy Mixed, returns empty array on null/false/'', transparent
1187          *            to already-converted arrays, converts String.
1188          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1189          */
1190         public static function formatRobotPolicy( $policy ) {
1191                 if ( is_array( $policy ) ) {
1192                         return $policy;
1193                 } elseif ( !$policy ) {
1194                         return array();
1195                 }
1196
1197                 $policy = explode( ',', $policy );
1198                 $policy = array_map( 'trim', $policy );
1199
1200                 $arr = array();
1201                 foreach ( $policy as $var ) {
1202                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1203                                 $arr['index'] = $var;
1204                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1205                                 $arr['follow'] = $var;
1206                         }
1207                 }
1208
1209                 return $arr;
1210         }
1211
1212         /**
1213          * If this request is a redirect view, send "redirected from" subtitle to
1214          * $wgOut. Returns true if the header was needed, false if this is not a
1215          * redirect view. Handles both local and remote redirects.
1216          *
1217          * @return boolean
1218          */
1219         public function showRedirectedFromHeader() {
1220                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1221
1222                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1223                 $sk = $wgUser->getSkin();
1224
1225                 if ( isset( $this->mRedirectedFrom ) ) {
1226                         // This is an internally redirected page view.
1227                         // We'll need a backlink to the source page for navigation.
1228                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1229                                 $redir = $sk->link(
1230                                         $this->mRedirectedFrom,
1231                                         null,
1232                                         array(),
1233                                         array( 'redirect' => 'no' ),
1234                                         array( 'known', 'noclasses' )
1235                                 );
1236
1237                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1238                                 $wgOut->setSubtitle( $s );
1239
1240                                 // Set the fragment if one was specified in the redirect
1241                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1242                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1243                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1244                                 }
1245
1246                                 // Add a <link rel="canonical"> tag
1247                                 $wgOut->addLink( array( 'rel' => 'canonical',
1248                                         'href' => $this->mTitle->getLocalURL() )
1249                                 );
1250
1251                                 return true;
1252                         }
1253                 } elseif ( $rdfrom ) {
1254                         // This is an externally redirected view, from some other wiki.
1255                         // If it was reported from a trusted site, supply a backlink.
1256                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1257                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1258                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1259                                 $wgOut->setSubtitle( $s );
1260
1261                                 return true;
1262                         }
1263                 }
1264
1265                 return false;
1266         }
1267
1268         /**
1269          * Show a header specific to the namespace currently being viewed, like
1270          * [[MediaWiki:Talkpagetext]]. For Article::view().
1271          */
1272         public function showNamespaceHeader() {
1273                 global $wgOut;
1274
1275                 if ( $this->mTitle->isTalkPage() ) {
1276                         $msg = wfMsgNoTrans( 'talkpageheader' );
1277                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1278                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1279                         }
1280                 }
1281         }
1282
1283         /**
1284          * Show the footer section of an ordinary page view
1285          */
1286         public function showViewFooter() {
1287                 global $wgOut, $wgUseTrackbacks;
1288
1289                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1290                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1291                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1292                 }
1293
1294                 # If we have been passed an &rcid= parameter, we want to give the user a
1295                 # chance to mark this new article as patrolled.
1296                 $this->showPatrolFooter();
1297
1298                 # Trackbacks
1299                 if ( $wgUseTrackbacks ) {
1300                         $this->addTrackbacks();
1301                 }
1302         }
1303
1304         /**
1305          * If patrol is possible, output a patrol UI box. This is called from the
1306          * footer section of ordinary page views. If patrol is not possible or not
1307          * desired, does nothing.
1308          */
1309         public function showPatrolFooter() {
1310                 global $wgOut, $wgRequest, $wgUser;
1311
1312                 $rcid = $wgRequest->getVal( 'rcid' );
1313
1314                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1315                         return;
1316                 }
1317
1318                 $sk = $wgUser->getSkin();
1319
1320                 $wgOut->addHTML(
1321                         "<div class='patrollink'>" .
1322                                 wfMsgHtml(
1323                                         'markaspatrolledlink',
1324                                         $sk->link(
1325                                                 $this->mTitle,
1326                                                 wfMsgHtml( 'markaspatrolledtext' ),
1327                                                 array(),
1328                                                 array(
1329                                                         'action' => 'markpatrolled',
1330                                                         'rcid' => $rcid
1331                                                 ),
1332                                                 array( 'known', 'noclasses' )
1333                                         )
1334                                 ) .
1335                         '</div>'
1336                 );
1337         }
1338
1339         /**
1340          * Show the error text for a missing article. For articles in the MediaWiki
1341          * namespace, show the default message text. To be called from Article::view().
1342          */
1343         public function showMissingArticle() {
1344                 global $wgOut, $wgRequest, $wgUser;
1345
1346                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1347                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1348                         $parts = explode( '/', $this->mTitle->getText() );
1349                         $rootPart = $parts[0];
1350                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1351                         $ip = User::isIP( $rootPart );
1352
1353                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1354                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1355                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1356                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1357                                 LogEventsList::showLogExtract(
1358                                         $wgOut,
1359                                         'block',
1360                                         $user->getUserPage()->getPrefixedText(),
1361                                         '',
1362                                         array(
1363                                                 'lim' => 1,
1364                                                 'showIfEmpty' => false,
1365                                                 'msgKey' => array(
1366                                                         'blocked-notice-logextract',
1367                                                         $user->getName() # Support GENDER in notice
1368                                                 )
1369                                         )
1370                                 );
1371                         }
1372                 }
1373
1374                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1375
1376                 # Show delete and move logs
1377                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1378                         array(  'lim' => 10,
1379                                 'conds' => array( "log_action != 'revision'" ),
1380                                 'showIfEmpty' => false,
1381                                 'msgKey' => array( 'moveddeleted-notice' ) )
1382                 );
1383
1384                 # Show error message
1385                 $oldid = $this->getOldID();
1386                 if ( $oldid ) {
1387                         $text = wfMsgNoTrans( 'missing-article',
1388                                 $this->mTitle->getPrefixedText(),
1389                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1390                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1391                         // Use the default message text
1392                         $text = $this->getContent();
1393                 } else {
1394                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1395                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1396                         $errors = array_merge( $createErrors, $editErrors );
1397
1398                         if ( !count( $errors ) ) {
1399                                 $text = wfMsgNoTrans( 'noarticletext' );
1400                         } else {
1401                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1402                         }
1403                 }
1404                 $text = "<div class='noarticletext'>\n$text\n</div>";
1405
1406                 if ( !$this->hasViewableContent() ) {
1407                         // If there's no backing content, send a 404 Not Found
1408                         // for better machine handling of broken links.
1409                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1410                 }
1411
1412                 $wgOut->addWikiText( $text );
1413         }
1414
1415         /**
1416          * If the revision requested for view is deleted, check permissions.
1417          * Send either an error message or a warning header to $wgOut.
1418          *
1419          * @return boolean true if the view is allowed, false if not.
1420          */
1421         public function showDeletedRevisionHeader() {
1422                 global $wgOut, $wgRequest;
1423
1424                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1425                         // Not deleted
1426                         return true;
1427                 }
1428
1429                 // If the user is not allowed to see it...
1430                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1431                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1432                                 'rev-deleted-text-permission' );
1433
1434                         return false;
1435                 // If the user needs to confirm that they want to see it...
1436                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1437                         # Give explanation and add a link to view the revision...
1438                         $oldid = intval( $this->getOldID() );
1439                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1440                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1441                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1442                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1443                                 array( $msg, $link ) );
1444
1445                         return false;
1446                 // We are allowed to see...
1447                 } else {
1448                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1449                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1450                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1451
1452                         return true;
1453                 }
1454         }
1455
1456         /**
1457          * Should the parser cache be used?
1458          *
1459          * @return boolean
1460          */
1461         public function useParserCache( $oldid ) {
1462                 global $wgUser, $wgEnableParserCache;
1463
1464                 return $wgEnableParserCache
1465                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1466                         && $this->exists()
1467                         && empty( $oldid )
1468                         && !$this->mTitle->isCssOrJsPage()
1469                         && !$this->mTitle->isCssJsSubpage();
1470         }
1471
1472         /**
1473          * Execute the uncached parse for action=view
1474          */
1475         public function doViewParse() {
1476                 global $wgOut;
1477
1478                 $oldid = $this->getOldID();
1479                 $useParserCache = $this->useParserCache( $oldid );
1480                 $parserOptions = clone $this->getParserOptions();
1481
1482                 # Render printable version, use printable version cache
1483                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1484
1485                 # Don't show section-edit links on old revisions... this way lies madness.
1486                 $parserOptions->setEditSection( $this->isCurrent() );
1487                 $useParserCache = $this->useParserCache( $oldid );
1488                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1489         }
1490
1491         /**
1492          * Try to fetch an expired entry from the parser cache. If it is present,
1493          * output it and return true. If it is not present, output nothing and
1494          * return false. This is used as a callback function for
1495          * PoolCounter::executeProtected().
1496          *
1497          * @return boolean
1498          */
1499         public function tryDirtyCache() {
1500
1501                 global $wgOut;
1502                 $parserCache = ParserCache::singleton();
1503                 $options = $this->getParserOptions();
1504                 $options->setIsPrintable( $wgOut->isPrintable() );
1505                 $output = $parserCache->getDirty( $this, $options );
1506
1507                 if ( $output ) {
1508                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1509                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1510                         $wgOut->setSquidMaxage( 0 );
1511                         $this->mParserOutput = $output;
1512                         $wgOut->addParserOutput( $output );
1513                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1514
1515                         return true;
1516                 } else {
1517                         wfDebugLog( 'dirty', "dirty missing\n" );
1518                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1519
1520                         return false;
1521                 }
1522         }
1523
1524         /**
1525          * Show an error page for an error from the pool counter.
1526          * @param $status Status
1527          */
1528         public function showPoolError( $status ) {
1529                 global $wgOut;
1530
1531                 $wgOut->clearHTML(); // for release() errors
1532                 $wgOut->enableClientCache( false );
1533                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1534                 $wgOut->addWikiText(
1535                         '<div class="errorbox">' .
1536                         $status->getWikiText( false, 'view-pool-error' ) .
1537                         '</div>'
1538                 );
1539         }
1540
1541         /**
1542          * View redirect
1543          *
1544          * @param $target Title object or Array of destination(s) to redirect
1545          * @param $appendSubtitle Boolean [optional]
1546          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1547          * @return string containing HMTL with redirect link
1548          */
1549         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1550                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1551
1552                 if ( !is_array( $target ) ) {
1553                         $target = array( $target );
1554                 }
1555
1556                 $imageDir = $wgContLang->getDir();
1557
1558                 if ( $appendSubtitle ) {
1559                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1560                 }
1561
1562                 $sk = $wgUser->getSkin();
1563                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1564                 $title = array_shift( $target );
1565
1566                 if ( $forceKnown ) {
1567                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1568                 } else {
1569                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1570                 }
1571
1572                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1573                 $alt = $wgContLang->isRTL() ? '←' : '→';
1574                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1575                 // FIXME: where this happens?
1576                 foreach ( $target as $rt ) {
1577                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1578                         if ( $forceKnown ) {
1579                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText() ) );
1580                         } else {
1581                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1582                         }
1583                 }
1584
1585                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1586                 return Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1587                         '<span class="redirectText">' . $link . '</span>';
1588         }
1589
1590         /**
1591          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1592          */
1593         public function addTrackbacks() {
1594                 global $wgOut, $wgUser;
1595
1596                 $dbr = wfGetDB( DB_SLAVE );
1597                 $tbs = $dbr->select( 'trackbacks',
1598                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1599                         array( 'tb_page' => $this->getID() )
1600                 );
1601
1602                 if ( !$dbr->numRows( $tbs ) ) {
1603                         return;
1604                 }
1605
1606                 $tbtext = "";
1607                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1608                         $rmvtxt = "";
1609
1610                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1611                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1612                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1613                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1614                         }
1615
1616                         $tbtext .= "\n";
1617                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1618                                         $o->tb_title,
1619                                         $o->tb_url,
1620                                         $o->tb_ex,
1621                                         $o->tb_name,
1622                                         $rmvtxt );
1623                 }
1624
1625                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1626         }
1627
1628         /**
1629          * Removes trackback record for current article from trackbacks table
1630          */
1631         public function deletetrackback() {
1632                 global $wgUser, $wgRequest, $wgOut;
1633
1634                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1635                         $wgOut->addWikiMsg( 'sessionfailure' );
1636
1637                         return;
1638                 }
1639
1640                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1641
1642                 if ( count( $permission_errors ) ) {
1643                         $wgOut->showPermissionsErrorPage( $permission_errors );
1644
1645                         return;
1646                 }
1647
1648                 $db = wfGetDB( DB_MASTER );
1649                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1650
1651                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1652                 $this->mTitle->invalidateCache();
1653         }
1654
1655         /**
1656          * Handle action=render
1657          */
1658
1659         public function render() {
1660                 global $wgOut;
1661
1662                 $wgOut->setArticleBodyOnly( true );
1663                 $this->view();
1664         }
1665
1666         /**
1667          * Handle action=purge
1668          */
1669         public function purge() {
1670                 global $wgUser, $wgRequest, $wgOut;
1671
1672                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1673                         //FIXME: shouldn't this be in doPurge()?
1674                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1675                                 $this->doPurge();
1676                                 $this->view();
1677                         }
1678                 } else {
1679                         $formParams = array(
1680                                 'method' => 'post',
1681                                 'action' =>  $wgRequest->getRequestURL(),
1682                         );
1683
1684                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1685
1686                         $form  = Html::openElement( 'form', $formParams );
1687                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1688                         $form .= Html::closeElement( 'form' );
1689
1690                         $wgOut->addHTML( $form );
1691                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1692
1693                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1694                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1695                 }
1696         }
1697
1698         /**
1699          * Perform the actions of a page purging
1700          */
1701         public function doPurge() {
1702                 global $wgUseSquid;
1703
1704                 // Invalidate the cache
1705                 $this->mTitle->invalidateCache();
1706
1707                 if ( $wgUseSquid ) {
1708                         // Commit the transaction before the purge is sent
1709                         $dbw = wfGetDB( DB_MASTER );
1710                         $dbw->commit();
1711
1712                         // Send purge
1713                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1714                         $update->doUpdate();
1715                 }
1716
1717                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1718                         global $wgMessageCache;
1719
1720                         if ( $this->getID() == 0 ) {
1721                                 $text = false;
1722                         } else {
1723                                 $text = $this->getRawText();
1724                         }
1725
1726                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1727                 }
1728         }
1729
1730         /**
1731          * Insert a new empty page record for this article.
1732          * This *must* be followed up by creating a revision
1733          * and running $this->updateRevisionOn( ... );
1734          * or else the record will be left in a funky state.
1735          * Best if all done inside a transaction.
1736          *
1737          * @param $dbw Database
1738          * @return int The newly created page_id key, or false if the title already existed
1739          * @private
1740          */
1741         public function insertOn( $dbw ) {
1742                 wfProfileIn( __METHOD__ );
1743
1744                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1745                 $dbw->insert( 'page', array(
1746                         'page_id'           => $page_id,
1747                         'page_namespace'    => $this->mTitle->getNamespace(),
1748                         'page_title'        => $this->mTitle->getDBkey(),
1749                         'page_counter'      => 0,
1750                         'page_restrictions' => '',
1751                         'page_is_redirect'  => 0, # Will set this shortly...
1752                         'page_is_new'       => 1,
1753                         'page_random'       => wfRandom(),
1754                         'page_touched'      => $dbw->timestamp(),
1755                         'page_latest'       => 0, # Fill this in shortly...
1756                         'page_len'          => 0, # Fill this in shortly...
1757                 ), __METHOD__, 'IGNORE' );
1758
1759                 $affected = $dbw->affectedRows();
1760
1761                 if ( $affected ) {
1762                         $newid = $dbw->insertId();
1763                         $this->mTitle->resetArticleId( $newid );
1764                 }
1765                 wfProfileOut( __METHOD__ );
1766
1767                 return $affected ? $newid : false;
1768         }
1769
1770         /**
1771          * Update the page record to point to a newly saved revision.
1772          *
1773          * @param $dbw Database object
1774          * @param $revision Revision: For ID number, and text used to set
1775                             length and redirect status fields
1776          * @param $lastRevision Integer: if given, will not overwrite the page field
1777          *                      when different from the currently set value.
1778          *                      Giving 0 indicates the new page flag should be set
1779          *                      on.
1780          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1781          *                           removing rows in redirect table.
1782          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1783          *                    Needed when $lastRevision has to be set to sth. !=0
1784          * @return bool true on success, false on failure
1785          * @private
1786          */
1787         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1788                 wfProfileIn( __METHOD__ );
1789
1790                 $text = $revision->getText();
1791                 $rt = Title::newFromRedirectRecurse( $text );
1792
1793                 $conditions = array( 'page_id' => $this->getId() );
1794
1795                 if ( !is_null( $lastRevision ) ) {
1796                         # An extra check against threads stepping on each other
1797                         $conditions['page_latest'] = $lastRevision;
1798                 }
1799
1800                 if ( !$setNewFlag ) {
1801                         $setNewFlag = ( $lastRevision === 0 );
1802                 }
1803
1804                 $dbw->update( 'page',
1805                         array( /* SET */
1806                                 'page_latest'      => $revision->getId(),
1807                                 'page_touched'     => $dbw->timestamp(),
1808                                 'page_is_new'      => $setNewFlag,
1809                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1810                                 'page_len'         => strlen( $text ),
1811                         ),
1812                         $conditions,
1813                         __METHOD__ );
1814
1815                 $result = $dbw->affectedRows() != 0;
1816                 if ( $result ) {
1817                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1818                 }
1819
1820                 wfProfileOut( __METHOD__ );
1821                 return $result;
1822         }
1823
1824         /**
1825          * Add row to the redirect table if this is a redirect, remove otherwise.
1826          *
1827          * @param $dbw Database
1828          * @param $redirectTitle a title object pointing to the redirect target,
1829          *                       or NULL if this is not a redirect
1830          * @param $lastRevIsRedirect If given, will optimize adding and
1831          *                           removing rows in redirect table.
1832          * @return bool true on success, false on failure
1833          * @private
1834          */
1835         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1836                 // Always update redirects (target link might have changed)
1837                 // Update/Insert if we don't know if the last revision was a redirect or not
1838                 // Delete if changing from redirect to non-redirect
1839                 $isRedirect = !is_null( $redirectTitle );
1840
1841                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1842                         wfProfileIn( __METHOD__ );
1843                         if ( $isRedirect ) {
1844                                 $this->insertRedirectEntry( $redirectTitle );
1845                         } else {
1846                                 // This is not a redirect, remove row from redirect table
1847                                 $where = array( 'rd_from' => $this->getId() );
1848                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1849                         }
1850
1851                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1852                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1853                         }
1854                         wfProfileOut( __METHOD__ );
1855
1856                         return ( $dbw->affectedRows() != 0 );
1857                 }
1858
1859                 return true;
1860         }
1861
1862         /**
1863          * If the given revision is newer than the currently set page_latest,
1864          * update the page record. Otherwise, do nothing.
1865          *
1866          * @param $dbw Database object
1867          * @param $revision Revision object
1868          * @return mixed
1869          */
1870         public function updateIfNewerOn( &$dbw, $revision ) {
1871                 wfProfileIn( __METHOD__ );
1872
1873                 $row = $dbw->selectRow(
1874                         array( 'revision', 'page' ),
1875                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1876                         array(
1877                                 'page_id' => $this->getId(),
1878                                 'page_latest=rev_id' ),
1879                         __METHOD__ );
1880
1881                 if ( $row ) {
1882                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1883                                 wfProfileOut( __METHOD__ );
1884                                 return false;
1885                         }
1886                         $prev = $row->rev_id;
1887                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1888                 } else {
1889                         # No or missing previous revision; mark the page as new
1890                         $prev = 0;
1891                         $lastRevIsRedirect = null;
1892                 }
1893
1894                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1895
1896                 wfProfileOut( __METHOD__ );
1897                 return $ret;
1898         }
1899
1900         /**
1901          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1902          * @param $text String: new text of the section
1903          * @param $summary String: new section's subject, only if $section is 'new'
1904          * @param $edittime String: revision timestamp or null to use the current revision
1905          * @return string Complete article text, or null if error
1906          */
1907         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1908                 wfProfileIn( __METHOD__ );
1909
1910                 if ( strval( $section ) == '' ) {
1911                         // Whole-page edit; let the whole text through
1912                 } else {
1913                         if ( is_null( $edittime ) ) {
1914                                 $rev = Revision::newFromTitle( $this->mTitle );
1915                         } else {
1916                                 $dbw = wfGetDB( DB_MASTER );
1917                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1918                         }
1919
1920                         if ( !$rev ) {
1921                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1922                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1923                                 return null;
1924                         }
1925
1926                         $oldtext = $rev->getText();
1927
1928                         if ( $section == 'new' ) {
1929                                 # Inserting a new section
1930                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1931                                 $text = strlen( trim( $oldtext ) ) > 0
1932                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1933                                                 : "{$subject}{$text}";
1934                         } else {
1935                                 # Replacing an existing section; roll out the big guns
1936                                 global $wgParser;
1937
1938                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1939                         }
1940                 }
1941
1942                 wfProfileOut( __METHOD__ );
1943                 return $text;
1944         }
1945
1946         /**
1947          * @deprecated use Article::doEdit()
1948          */
1949         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1950                 wfDeprecated( __METHOD__ );
1951                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1952                         ( $isminor ? EDIT_MINOR : 0 ) |
1953                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1954                         ( $bot ? EDIT_FORCE_BOT : 0 );
1955
1956                 $this->doEdit( $text, $summary, $flags, false, null, $watchthis, $comment, '', true );
1957         }
1958
1959         /**
1960          * @deprecated use Article::doEdit()
1961          */
1962         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1963                 wfDeprecated( __METHOD__ );
1964                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1965                         ( $minor ? EDIT_MINOR : 0 ) |
1966                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1967
1968                 $status = $this->doEdit( $text, $summary, $flags, false, null, $watchthis, false, $sectionanchor, true );
1969
1970                 if ( !$status->isOK() ) {
1971                         return false;
1972                 }
1973
1974                 return true;
1975         }
1976
1977         /**
1978          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1979          * @param $flags Int
1980          * @return Int updated $flags
1981          */
1982         function checkFlags( $flags ) {
1983                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1984                         if ( $this->mTitle->getArticleID() ) {
1985                                 $flags |= EDIT_UPDATE;
1986                         } else {
1987                                 $flags |= EDIT_NEW;
1988                         }
1989                 }
1990
1991                 return $flags;
1992         }
1993
1994         /**
1995          * Article::doEdit()
1996          *
1997          * Change an existing article or create a new article. Updates RC and all necessary caches,
1998          * optionally via the deferred update array.
1999          *
2000          * $wgUser must be set before calling this function.
2001          *
2002          * @param $text String: new text
2003          * @param $summary String: edit summary
2004          * @param $flags Integer bitfield:
2005          *      EDIT_NEW
2006          *          Article is known or assumed to be non-existent, create a new one
2007          *      EDIT_UPDATE
2008          *          Article is known or assumed to be pre-existing, update it
2009          *      EDIT_MINOR
2010          *          Mark this edit minor, if the user is allowed to do so
2011          *      EDIT_SUPPRESS_RC
2012          *          Do not log the change in recentchanges
2013          *      EDIT_FORCE_BOT
2014          *          Mark the edit a "bot" edit regardless of user rights
2015          *      EDIT_DEFER_UPDATES
2016          *          Defer some of the updates until the end of index.php
2017          *      EDIT_AUTOSUMMARY
2018          *          Fill in blank summaries with generated text where possible
2019          *
2020          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2021          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2022          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2023          * edit-already-exists error will be returned. These two conditions are also possible with
2024          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2025          *
2026          * @param $baseRevId the revision ID this edit was based off, if any
2027          * @param $user Optional user object, $wgUser will be used if not passed
2028          * @param $watchthis Watch the page if true, unwatch the page if false, do nothing if null
2029          * @param $comment Boolean: whether the edit is a new section
2030          * @param $sectionanchor The section anchor for the page; used for redirecting the user back to the page
2031          *              after the edit is successfully committed
2032          * @param $redirect If true, redirect the user back to the page after the edit is successfully committed
2033          *
2034          * @return Status object. Possible errors:
2035          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2036          *     edit-gone-missing:       In update mode, but the article didn't exist
2037          *     edit-conflict:           In update mode, the article changed unexpectedly
2038          *     edit-no-change:          Warning that the text was the same as before
2039          *     edit-already-exists:     In creation mode, but the article already exists
2040          *
2041          *  Extensions may define additional errors.
2042          *
2043          *  $return->value will contain an associative array with members as follows:
2044          *     new:                     Boolean indicating if the function attempted to create a new article
2045          *     revision:                The revision object for the inserted revision, or null
2046          *
2047          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2048          */
2049         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null , $watchthis = null,
2050                         $comment = false, $sectionanchor = '', $redirect = false) {
2051                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2052
2053                 # Low-level sanity check
2054                 if ( $this->mTitle->getText() === '' ) {
2055                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2056                 }
2057
2058                 wfProfileIn( __METHOD__ );
2059
2060                 $user = is_null( $user ) ? $wgUser : $user;
2061                 $status = Status::newGood( array() );
2062
2063                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2064                 $this->loadPageData();
2065
2066                 $flags = $this->checkFlags( $flags );
2067
2068                 # If this is a comment, add the summary as headline
2069                 if ( $comment && $summary != "" ) {
2070                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
2071                 }
2072
2073                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2074                         $flags & EDIT_MINOR, &$watchthis, null, &$flags, &$status) ) )
2075                 {
2076                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2077                         wfProfileOut( __METHOD__ );
2078
2079                         if ( $status->isOK() ) {
2080                                 $status->fatal( 'edit-hook-aborted' );
2081                         }
2082
2083                         return $status;
2084                 }
2085
2086                 # Silently ignore EDIT_MINOR if not allowed
2087                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2088                 $bot = $flags & EDIT_FORCE_BOT;
2089
2090                 $oldtext = $this->getRawText(); // current revision
2091                 $oldsize = strlen( $oldtext );
2092
2093                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2094                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2095                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2096                 }
2097
2098                 $editInfo = $this->prepareTextForEdit( $text );
2099                 $text = $editInfo->pst;
2100                 $newsize = strlen( $text );
2101
2102                 $dbw = wfGetDB( DB_MASTER );
2103                 $now = wfTimestampNow();
2104                 $this->mTimestamp = $now;
2105
2106                 if ( $flags & EDIT_UPDATE ) {
2107                         # Update article, but only if changed.
2108                         $status->value['new'] = false;
2109
2110                         # Make sure the revision is either completely inserted or not inserted at all
2111                         if ( !$wgDBtransactions ) {
2112                                 $userAbort = ignore_user_abort( true );
2113                         }
2114
2115                         $revisionId = 0;
2116
2117                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2118
2119                         if ( $changed ) {
2120                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2121                                   - (int)$this->isCountable( $oldtext );
2122                                 $this->mTotalAdjustment = 0;
2123
2124                                 if ( !$this->mLatest ) {
2125                                         # Article gone missing
2126                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2127                                         $status->fatal( 'edit-gone-missing' );
2128
2129                                         wfProfileOut( __METHOD__ );
2130                                         return $status;
2131                                 }
2132
2133                                 $revision = new Revision( array(
2134                                         'page'       => $this->getId(),
2135                                         'comment'    => $summary,
2136                                         'minor_edit' => $isminor,
2137                                         'text'       => $text,
2138                                         'parent_id'  => $this->mLatest,
2139                                         'user'       => $user->getId(),
2140                                         'user_text'  => $user->getName(),
2141                                 ) );
2142
2143                                 $dbw->begin();
2144                                 $revisionId = $revision->insertOn( $dbw );
2145
2146                                 # Update page
2147                                 #
2148                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2149                                 # during the course of this function. This makes sure that EditPage can detect
2150                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2151                                 # before this function is called. A previous function used a separate query, this
2152                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2153                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2154
2155                                 if ( !$ok ) {
2156                                         /* Belated edit conflict! Run away!! */
2157                                         $status->fatal( 'edit-conflict' );
2158
2159                                         # Delete the invalid revision if the DB is not transactional
2160                                         if ( !$wgDBtransactions ) {
2161                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2162                                         }
2163
2164                                         $revisionId = 0;
2165                                         $dbw->rollback();
2166                                 } else {
2167                                         global $wgUseRCPatrol;
2168                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2169                                         # Update recentchanges
2170                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2171                                                 # Mark as patrolled if the user can do so
2172                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2173                                                 # Add RC row to the DB
2174                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2175                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2176                                                         $revisionId, $patrolled
2177                                                 );
2178
2179                                                 # Log auto-patrolled edits
2180                                                 if ( $patrolled ) {
2181                                                         PatrolLog::record( $rc, true );
2182                                                 }
2183                                         }
2184                                         $user->incEditCount();
2185                                         $dbw->commit();
2186                                 }
2187                         } else {
2188                                 $status->warning( 'edit-no-change' );
2189                                 $revision = null;
2190                                 // Keep the same revision ID, but do some updates on it
2191                                 $revisionId = $this->getRevIdFetched();
2192                                 // Update page_touched, this is usually implicit in the page update
2193                                 // Other cache updates are done in onArticleEdit()
2194                                 $this->mTitle->invalidateCache();
2195                         }
2196
2197                         if ( !$wgDBtransactions ) {
2198                                 ignore_user_abort( $userAbort );
2199                         }
2200
2201                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2202                         if ( !$status->isOK() ) {
2203                                 wfProfileOut( __METHOD__ );
2204                                 return $status;
2205                         }
2206
2207                         # Invalidate cache of this article and all pages using this article
2208                         # as a template. Partly deferred.
2209                         Article::onArticleEdit( $this->mTitle );
2210                         # Update links tables, site stats, etc.
2211                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2212                 } else {
2213                         # Create new article
2214                         $status->value['new'] = true;
2215
2216                         # Set statistics members
2217                         # We work out if it's countable after PST to avoid counter drift
2218                         # when articles are created with {{subst:}}
2219                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2220                         $this->mTotalAdjustment = 1;
2221
2222                         $dbw->begin();
2223
2224                         # Add the page record; stake our claim on this title!
2225                         # This will return false if the article already exists
2226                         $newid = $this->insertOn( $dbw );
2227
2228                         if ( $newid === false ) {
2229                                 $dbw->rollback();
2230                                 $status->fatal( 'edit-already-exists' );
2231
2232                                 wfProfileOut( __METHOD__ );
2233                                 return $status;
2234                         }
2235
2236                         # Save the revision text...
2237                         $revision = new Revision( array(
2238                                 'page'       => $newid,
2239                                 'comment'    => $summary,
2240                                 'minor_edit' => $isminor,
2241                                 'text'       => $text,
2242                                 'user'       => $user->getId(),
2243                                 'user_text'  => $user->getName(),
2244                                 ) );
2245                         $revisionId = $revision->insertOn( $dbw );
2246
2247                         $this->mTitle->resetArticleID( $newid );
2248
2249                         # Update the page record with revision data
2250                         $this->updateRevisionOn( $dbw, $revision, 0 );
2251
2252                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2253
2254                         # Update recentchanges
2255                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2256                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2257
2258                                 # Mark as patrolled if the user can do so
2259                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2260                                 # Add RC row to the DB
2261                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2262                                         '', strlen( $text ), $revisionId, $patrolled );
2263
2264                                 # Log auto-patrolled edits
2265                                 if ( $patrolled ) {
2266                                         PatrolLog::record( $rc, true );
2267                                 }
2268                         }
2269                         $user->incEditCount();
2270                         $dbw->commit();
2271
2272                         # Update links, etc.
2273                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2274
2275                         # Clear caches
2276                         Article::onArticleCreate( $this->mTitle );
2277
2278                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2279                                 $flags & EDIT_MINOR, &$watchthis, null, &$flags, $revision ) );
2280                 }
2281
2282                 # Do updates right now unless deferral was requested
2283                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2284                         wfDoUpdates();
2285                 }
2286
2287                 // Return the new revision (or null) to the caller
2288                 $status->value['revision'] = $revision;
2289
2290                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2291                         $flags & EDIT_MINOR, &$watchthis, null, &$flags, $revision, &$status, $baseRevId,
2292                         &$redirect) );
2293
2294                 # Watch or unwatch the page
2295                 if ( $watchthis === true ) {
2296                         if ( !$this->mTitle->userIsWatching() ) {
2297                                 $dbw->begin();
2298                                 $this->doWatch();
2299                                 $dbw->commit();
2300                         }
2301                 } elseif ( $watchthis === false ) {
2302                         if ( $this->mTitle->userIsWatching() ) {
2303                                 $dbw->begin();
2304                                 $this->doUnwatch();
2305                                 $dbw->commit();
2306                         }
2307                 }
2308
2309                 # Give extensions a chance to modify URL query on update
2310                 $extraQuery = '';
2311
2312                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
2313
2314                 if ( $redirect ) {
2315                         if ( $sectionanchor || $extraQuery ) {
2316                                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
2317                         } else {
2318                                 $this->doRedirect( $this->isRedirect( $text ) );
2319                         }
2320                 }
2321
2322                 wfProfileOut( __METHOD__ );
2323
2324                 return $status;
2325         }
2326
2327         /**
2328          * @deprecated wrapper for doRedirect
2329          */
2330         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2331                 wfDeprecated( __METHOD__ );
2332                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2333         }
2334
2335         /**
2336          * Output a redirect back to the article.
2337          * This is typically used after an edit.
2338          *
2339          * @param $noRedir Boolean: add redirect=no
2340          * @param $sectionAnchor String: section to redirect to, including "#"
2341          * @param $extraQuery String: extra query params
2342          */
2343         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2344                 global $wgOut;
2345
2346                 if ( $noRedir ) {
2347                         $query = 'redirect=no';
2348                         if ( $extraQuery )
2349                                 $query .= "&$extraQuery";
2350                 } else {
2351                         $query = $extraQuery;
2352                 }
2353
2354                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2355         }
2356
2357         /**
2358          * Mark this particular edit/page as patrolled
2359          */
2360         public function markpatrolled() {
2361                 global $wgOut, $wgRequest;
2362
2363                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2364
2365                 # If we haven't been given an rc_id value, we can't do anything
2366                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2367                 $rc = RecentChange::newFromId( $rcid );
2368
2369                 if ( is_null( $rc ) ) {
2370                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2371                         return;
2372                 }
2373
2374                 # It would be nice to see where the user had actually come from, but for now just guess
2375                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2376                 $return = SpecialPage::getTitleFor( $returnto );
2377
2378                 $errors = $rc->doMarkPatrolled();
2379
2380                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2381                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2382
2383                         return;
2384                 }
2385
2386                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2387                         // The hook itself has handled any output
2388                         return;
2389                 }
2390
2391                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2392                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2393                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2394                         $wgOut->returnToMain( false, $return );
2395
2396                         return;
2397                 }
2398
2399                 if ( !empty( $errors ) ) {
2400                         $wgOut->showPermissionsErrorPage( $errors );
2401
2402                         return;
2403                 }
2404
2405                 # Inform the user
2406                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2407                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2408                 $wgOut->returnToMain( false, $return );
2409         }
2410
2411         /**
2412          * User-interface handler for the "watch" action
2413          */
2414         public function watch() {
2415                 global $wgUser, $wgOut;
2416
2417                 if ( $wgUser->isAnon() ) {
2418                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2419                         return;
2420                 }
2421
2422                 if ( wfReadOnly() ) {
2423                         $wgOut->readOnlyPage();
2424                         return;
2425                 }
2426
2427                 if ( $this->doWatch() ) {
2428                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2429                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2430                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2431                 }
2432
2433                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2434         }
2435
2436         /**
2437          * Add this page to $wgUser's watchlist
2438          * @return bool true on successful watch operation
2439          */
2440         public function doWatch() {
2441                 global $wgUser;
2442
2443                 if ( $wgUser->isAnon() ) {
2444                         return false;
2445                 }
2446
2447                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2448                         $wgUser->addWatch( $this->mTitle );
2449                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2450                 }
2451
2452                 return false;
2453         }
2454
2455         /**
2456          * User interface handler for the "unwatch" action.
2457          */
2458         public function unwatch() {
2459                 global $wgUser, $wgOut;
2460
2461                 if ( $wgUser->isAnon() ) {
2462                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2463                         return;
2464                 }
2465
2466                 if ( wfReadOnly() ) {
2467                         $wgOut->readOnlyPage();
2468                         return;
2469                 }
2470
2471                 if ( $this->doUnwatch() ) {
2472                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2473                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2474                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2475                 }
2476
2477                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2478         }
2479
2480         /**
2481          * Stop watching a page
2482          * @return bool true on successful unwatch
2483          */
2484         public function doUnwatch() {
2485                 global $wgUser;
2486
2487                 if ( $wgUser->isAnon() ) {
2488                         return false;
2489                 }
2490
2491                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2492                         $wgUser->removeWatch( $this->mTitle );
2493                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2494                 }
2495
2496                 return false;
2497         }
2498
2499         /**
2500          * action=protect handler
2501          */
2502         public function protect() {
2503                 $form = new ProtectionForm( $this );
2504                 $form->execute();
2505         }
2506
2507         /**
2508          * action=unprotect handler (alias)
2509          */
2510         public function unprotect() {
2511                 $this->protect();
2512         }
2513
2514         /**
2515          * Update the article's restriction field, and leave a log entry.
2516          *
2517          * @param $limit Array: set of restriction keys
2518          * @param $reason String
2519          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2520          * @param $expiry Array: per restriction type expiration
2521          * @return bool true on success
2522          */
2523         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2524                 global $wgUser, $wgContLang;
2525
2526                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2527
2528                 $id = $this->mTitle->getArticleID();
2529
2530                 if ( $id <= 0 ) {
2531                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2532                         return false;
2533                 }
2534
2535                 if ( wfReadOnly() ) {
2536                         wfDebug( "updateRestrictions failed: read-only\n" );
2537                         return false;
2538                 }
2539
2540                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2541                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2542                         return false;
2543                 }
2544
2545                 if ( !$cascade ) {
2546                         $cascade = false;
2547                 }
2548
2549                 // Take this opportunity to purge out expired restrictions
2550                 Title::purgeExpiredRestrictions();
2551
2552                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2553                 # we expect a single selection, but the schema allows otherwise.
2554                 $current = array();
2555                 $updated = Article::flattenRestrictions( $limit );
2556                 $changed = false;
2557
2558                 foreach ( $restrictionTypes as $action ) {
2559                         if ( isset( $expiry[$action] ) ) {
2560                                 # Get current restrictions on $action
2561                                 $aLimits = $this->mTitle->getRestrictions( $action );
2562                                 $current[$action] = implode( '', $aLimits );
2563                                 # Are any actual restrictions being dealt with here?
2564                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2565
2566                                 # If something changed, we need to log it. Checking $aRChanged
2567                                 # assures that "unprotecting" a page that is not protected does
2568                                 # not log just because the expiry was "changed".
2569                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2570                                         $changed = true;
2571                                 }
2572                         }
2573                 }
2574
2575                 $current = Article::flattenRestrictions( $current );
2576
2577                 $changed = ( $changed || $current != $updated );
2578                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2579                 $protect = ( $updated != '' );
2580
2581                 # If nothing's changed, do nothing
2582                 if ( $changed ) {
2583                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2584                                 $dbw = wfGetDB( DB_MASTER );
2585
2586                                 # Prepare a null revision to be added to the history
2587                                 $modified = $current != '' && $protect;
2588
2589                                 if ( $protect ) {
2590                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2591                                 } else {
2592                                         $comment_type = 'unprotectedarticle';
2593                                 }
2594
2595                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2596
2597                                 # Only restrictions with the 'protect' right can cascade...
2598                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2599                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2600
2601                                 # The schema allows multiple restrictions
2602                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2603                                         $cascade = false;
2604                                 }
2605
2606                                 $cascade_description = '';
2607
2608                                 if ( $cascade ) {
2609                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2610                                 }
2611
2612                                 if ( $reason ) {
2613                                         $comment .= ": $reason";
2614                                 }
2615
2616                                 $editComment = $comment;
2617                                 $encodedExpiry = array();
2618                                 $protect_description = '';
2619                                 foreach ( $limit as $action => $restrictions ) {
2620                                         if ( !isset( $expiry[$action] ) )
2621                                                 $expiry[$action] = 'infinite';
2622
2623                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2624                                         if ( $restrictions != '' ) {
2625                                                 $protect_description .= "[$action=$restrictions] (";
2626                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2627                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2628                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2629                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2630                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2631                                                 } else {
2632                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2633                                                 }
2634
2635                                                 $protect_description .= ') ';
2636                                         }
2637                                 }
2638                                 $protect_description = trim( $protect_description );
2639
2640                                 if ( $protect_description && $protect ) {
2641                                         $editComment .= " ($protect_description)";
2642                                 }
2643
2644                                 if ( $cascade ) {
2645                                         $editComment .= "$cascade_description";
2646                                 }
2647
2648                                 # Update restrictions table
2649                                 foreach ( $limit as $action => $restrictions ) {
2650                                         if ( $restrictions != '' ) {
2651                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2652                                                         array( 'pr_page' => $id,
2653                                                                 'pr_type' => $action,
2654                                                                 'pr_level' => $restrictions,
2655                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2656                                                                 'pr_expiry' => $encodedExpiry[$action]
2657                                                         ),
2658                                                         __METHOD__
2659                                                 );
2660                                         } else {
2661                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2662                                                         'pr_type' => $action ), __METHOD__ );
2663                                         }
2664                                 }
2665
2666                                 # Insert a null revision
2667                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2668                                 $nullRevId = $nullRevision->insertOn( $dbw );
2669
2670                                 $latest = $this->getLatest();
2671                                 # Update page record
2672                                 $dbw->update( 'page',
2673                                         array( /* SET */
2674                                                 'page_touched' => $dbw->timestamp(),
2675                                                 'page_restrictions' => '',
2676                                                 'page_latest' => $nullRevId
2677                                         ), array( /* WHERE */
2678                                                 'page_id' => $id
2679                                         ), 'Article::protect'
2680                                 );
2681
2682                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2683                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2684
2685                                 # Update the protection log
2686                                 $log = new LogPage( 'protect' );
2687                                 if ( $protect ) {
2688                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2689                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2690                                 } else {
2691                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2692                                 }
2693                         } # End hook
2694                 } # End "changed" check
2695
2696                 return true;
2697         }
2698
2699         /**
2700          * Take an array of page restrictions and flatten it to a string
2701          * suitable for insertion into the page_restrictions field.
2702          * @param $limit Array
2703          * @return String
2704          */
2705         protected static function flattenRestrictions( $limit ) {
2706                 if ( !is_array( $limit ) ) {
2707                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2708                 }
2709
2710                 $bits = array();
2711                 ksort( $limit );
2712
2713                 foreach ( $limit as $action => $restrictions ) {
2714                         if ( $restrictions != '' ) {
2715                                 $bits[] = "$action=$restrictions";
2716                         }
2717                 }
2718
2719                 return implode( ':', $bits );
2720         }
2721
2722         /**
2723          * Auto-generates a deletion reason
2724          *
2725          * @param &$hasHistory Boolean: whether the page has a history
2726          * @return mixed String containing deletion reason or empty string, or boolean false
2727          *    if no revision occurred
2728          */
2729         public function generateReason( &$hasHistory ) {
2730                 global $wgContLang;
2731
2732                 $dbw = wfGetDB( DB_MASTER );
2733                 // Get the last revision
2734                 $rev = Revision::newFromTitle( $this->mTitle );
2735
2736                 if ( is_null( $rev ) ) {
2737                         return false;
2738                 }
2739
2740                 // Get the article's contents
2741                 $contents = $rev->getText();
2742                 $blank = false;
2743
2744                 // If the page is blank, use the text from the previous revision,
2745                 // which can only be blank if there's a move/import/protect dummy revision involved
2746                 if ( $contents == '' ) {
2747                         $prev = $rev->getPrevious();
2748
2749                         if ( $prev )    {
2750                                 $contents = $prev->getText();
2751                                 $blank = true;
2752                         }
2753                 }
2754
2755                 // Find out if there was only one contributor
2756                 // Only scan the last 20 revisions
2757                 $res = $dbw->select( 'revision', 'rev_user_text',
2758                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2759                         __METHOD__,
2760                         array( 'LIMIT' => 20 )
2761                 );
2762
2763                 if ( $res === false ) {
2764                         // This page has no revisions, which is very weird
2765                         return false;
2766                 }
2767
2768                 $hasHistory = ( $res->numRows() > 1 );
2769                 $row = $dbw->fetchObject( $res );
2770
2771                 if ( $row ) { // $row is false if the only contributor is hidden
2772                         $onlyAuthor = $row->rev_user_text;
2773                         // Try to find a second contributor
2774                         foreach ( $res as $row ) {
2775                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2776                                         $onlyAuthor = false;
2777                                         break;
2778                                 }
2779                         }
2780                 } else {
2781                         $onlyAuthor = false;
2782                 }
2783
2784                 $dbw->freeResult( $res );
2785
2786                 // Generate the summary with a '$1' placeholder
2787                 if ( $blank ) {
2788                         // The current revision is blank and the one before is also
2789                         // blank. It's just not our lucky day
2790                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2791                 } else {
2792                         if ( $onlyAuthor ) {
2793                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2794                         } else {
2795                                 $reason = wfMsgForContent( 'excontent', '$1' );
2796                         }
2797                 }
2798
2799                 if ( $reason == '-' ) {
2800                         // Allow these UI messages to be blanked out cleanly
2801                         return '';
2802                 }
2803
2804                 // Replace newlines with spaces to prevent uglyness
2805                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2806                 // Calculate the maximum amount of chars to get
2807                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2808                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2809                 $contents = $wgContLang->truncate( $contents, $maxLength );
2810                 // Remove possible unfinished links
2811                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2812                 // Now replace the '$1' placeholder
2813                 $reason = str_replace( '$1', $contents, $reason );
2814
2815                 return $reason;
2816         }
2817
2818
2819         /*
2820          * UI entry point for page deletion
2821          */
2822         public function delete() {
2823                 global $wgUser, $wgOut, $wgRequest;
2824
2825                 $confirm = $wgRequest->wasPosted() &&
2826                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2827
2828                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2829                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2830
2831                 $reason = $this->DeleteReasonList;
2832
2833                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2834                         // Entry from drop down menu + additional comment
2835                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2836                 } elseif ( $reason == 'other' ) {
2837                         $reason = $this->DeleteReason;
2838                 }
2839
2840                 # Flag to hide all contents of the archived revisions
2841                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2842
2843                 # This code desperately needs to be totally rewritten
2844
2845                 # Read-only check...
2846                 if ( wfReadOnly() ) {
2847                         $wgOut->readOnlyPage();
2848
2849                         return;
2850                 }
2851
2852                 # Check permissions
2853                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2854
2855                 if ( count( $permission_errors ) > 0 ) {
2856                         $wgOut->showPermissionsErrorPage( $permission_errors );
2857
2858                         return;
2859                 }
2860
2861                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2862
2863                 # Better double-check that it hasn't been deleted yet!
2864                 $dbw = wfGetDB( DB_MASTER );
2865                 $conds = $this->mTitle->pageCond();
2866                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2867                 if ( $latest === false ) {
2868                         $wgOut->showFatalError(
2869                                 Html::rawElement(
2870                                         'div',
2871                                         array( 'class' => 'error mw-error-cannotdelete' ),
2872                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2873                                 )
2874                         );
2875                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2876                         LogEventsList::showLogExtract(
2877                                 $wgOut,
2878                                 'delete',
2879                                 $this->mTitle->getPrefixedText()
2880                         );
2881
2882                         return;
2883                 }
2884
2885                 # Hack for big sites
2886                 $bigHistory = $this->isBigDeletion();
2887                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2888                         global $wgLang, $wgDeleteRevisionsLimit;
2889
2890                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2891                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2892
2893                         return;
2894                 }
2895
2896                 if ( $confirm ) {
2897                         $this->doDelete( $reason, $suppress );
2898
2899                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2900                                 $this->doWatch();
2901                         } elseif ( $this->mTitle->userIsWatching() ) {
2902                                 $this->doUnwatch();
2903                         }
2904
2905                         return;
2906                 }
2907
2908                 // Generate deletion reason
2909                 $hasHistory = false;
2910                 if ( !$reason ) {
2911                         $reason = $this->generateReason( $hasHistory );
2912                 }
2913
2914                 // If the page has a history, insert a warning
2915                 if ( $hasHistory && !$confirm ) {
2916                         global $wgLang;
2917
2918                         $skin = $wgUser->getSkin();
2919                         $revisions = $this->estimateRevisionCount();
2920                         //FIXME: lego
2921                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2922                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2923                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2924                                 '</strong>'
2925                         );
2926
2927                         if ( $bigHistory ) {
2928                                 global $wgDeleteRevisionsLimit;
2929                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2930                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2931                         }
2932                 }
2933
2934                 return $this->confirmDelete( $reason );
2935         }
2936
2937         /**
2938          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2939          */
2940         public function isBigDeletion() {
2941                 global $wgDeleteRevisionsLimit;
2942
2943                 if ( $wgDeleteRevisionsLimit ) {
2944                         $revCount = $this->estimateRevisionCount();
2945
2946                         return $revCount > $wgDeleteRevisionsLimit;
2947                 }
2948
2949                 return false;
2950         }
2951
2952         /**
2953          * @return int approximate revision count
2954          */
2955         public function estimateRevisionCount() {
2956                 $dbr = wfGetDB( DB_SLAVE );
2957
2958                 // For an exact count...
2959                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2960                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2961                 return $dbr->estimateRowCount( 'revision', '*',
2962                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2963         }
2964
2965         /**
2966          * Get the last N authors
2967          * @param $num Integer: number of revisions to get
2968          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2969          * @return array Array of authors, duplicates not removed
2970          */
2971         public function getLastNAuthors( $num, $revLatest = 0 ) {
2972                 wfProfileIn( __METHOD__ );
2973                 // First try the slave
2974                 // If that doesn't have the latest revision, try the master
2975                 $continue = 2;
2976                 $db = wfGetDB( DB_SLAVE );
2977
2978                 do {
2979                         $res = $db->select( array( 'page', 'revision' ),
2980                                 array( 'rev_id', 'rev_user_text' ),
2981                                 array(
2982                                         'page_namespace' => $this->mTitle->getNamespace(),
2983                                         'page_title' => $this->mTitle->getDBkey(),
2984                                         'rev_page = page_id'
2985                                 ), __METHOD__, $this->getSelectOptions( array(
2986                                         'ORDER BY' => 'rev_timestamp DESC',
2987                                         'LIMIT' => $num
2988                                 ) )
2989                         );
2990
2991                         if ( !$res ) {
2992                                 wfProfileOut( __METHOD__ );
2993                                 return array();
2994                         }
2995
2996                         $row = $db->fetchObject( $res );
2997
2998                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2999                                 $db = wfGetDB( DB_MASTER );
3000                                 $continue--;
3001                         } else {
3002                                 $continue = 0;
3003                         }
3004                 } while ( $continue );
3005
3006                 $authors = array( $row->rev_user_text );
3007
3008                 while ( $row = $db->fetchObject( $res ) ) {
3009                         $authors[] = $row->rev_user_text;
3010                 }
3011
3012                 wfProfileOut( __METHOD__ );
3013                 return $authors;
3014         }
3015
3016         /**
3017          * Output deletion confirmation dialog
3018          * FIXME: Move to another file?
3019          * @param $reason String: prefilled reason
3020          */
3021         public function confirmDelete( $reason ) {
3022                 global $wgOut, $wgUser;
3023
3024                 wfDebug( "Article::confirmDelete\n" );
3025
3026                 $deleteBackLink = $wgUser->getSkin()->linkKnown( $this->mTitle );
3027                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
3028                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3029                 $wgOut->addWikiMsg( 'confirmdeletetext' );
3030
3031                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
3032
3033                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
3034                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
3035                                         <td></td>
3036                                         <td class='mw-input'><strong>" .
3037                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
3038                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
3039                                         "</strong></td>
3040                                 </tr>";
3041                 } else {
3042                         $suppress = '';
3043                 }
3044                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3045
3046                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3047                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3048                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3049                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3050                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3051                         "<tr id=\"wpDeleteReasonListRow\">
3052                                 <td class='mw-label'>" .
3053                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3054                                 "</td>
3055                                 <td class='mw-input'>" .
3056                                         Xml::listDropDown( 'wpDeleteReasonList',
3057                                                 wfMsgForContent( 'deletereason-dropdown' ),
3058                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3059                                 "</td>
3060                         </tr>
3061                         <tr id=\"wpDeleteReasonRow\">
3062                                 <td class='mw-label'>" .
3063                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3064                                 "</td>
3065                                 <td class='mw-input'>" .
3066                                 Html::input( 'wpReason', $reason, 'text', array(
3067                                         'size' => '60',
3068                                         'maxlength' => '255',
3069                                         'tabindex' => '2',
3070                                         'id' => 'wpReason',
3071                                         'autofocus'
3072                                 ) ) .
3073                                 "</td>
3074                         </tr>";
3075
3076                 # Disallow watching if user is not logged in
3077                 if ( $wgUser->isLoggedIn() ) {
3078                         $form .= "
3079                         <tr>
3080                                 <td></td>
3081                                 <td class='mw-input'>" .
3082                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3083                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3084                                 "</td>
3085                         </tr>";
3086                 }
3087
3088                 $form .= "
3089                         $suppress
3090                         <tr>
3091                                 <td></td>
3092                                 <td class='mw-submit'>" .
3093                                         Xml::submitButton( wfMsg( 'deletepage' ),
3094                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3095                                 "</td>
3096                         </tr>" .
3097                         Xml::closeElement( 'table' ) .
3098                         Xml::closeElement( 'fieldset' ) .
3099                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
3100                         Xml::closeElement( 'form' );
3101
3102                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
3103                                 $skin = $wgUser->getSkin();
3104                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3105                                 $link = $skin->link(
3106                                         $title,
3107                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3108                                         array(),
3109                                         array( 'action' => 'edit' )
3110                                 );
3111                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3112                         }
3113
3114                 $wgOut->addHTML( $form );
3115                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3116                 LogEventsList::showLogExtract( $wgOut, 'delete',
3117                         $this->mTitle->getPrefixedText()
3118                 );
3119         }
3120
3121         /**
3122          * Perform a deletion and output success or failure messages
3123          */
3124         public function doDelete( $reason, $suppress = false ) {
3125                 global $wgOut, $wgUser;
3126
3127                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3128
3129                 $error = '';
3130                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3131                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
3132                                 $deleted = $this->mTitle->getPrefixedText();
3133
3134                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3135                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3136
3137                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3138
3139                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3140                                 $wgOut->returnToMain( false );
3141                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3142                         }
3143                 } else {
3144                         if ( $error == '' ) {
3145                                 $wgOut->showFatalError(
3146                                         Html::rawElement(
3147                                                 'div',
3148                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3149                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3150                                         )
3151                                 );
3152
3153                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3154
3155                                 LogEventsList::showLogExtract(
3156                                         $wgOut,
3157                                         'delete',
3158                                         $this->mTitle->getPrefixedText()
3159                                 );
3160                         } else {
3161                                 $wgOut->showFatalError( $error );
3162                         }
3163                 }
3164         }
3165
3166         /**
3167          * Back-end article deletion
3168          * Deletes the article with database consistency, writes logs, purges caches
3169          *
3170          * @param $reason string delete reason for deletion log
3171          * @param suppress bitfield
3172          *      Revision::DELETED_TEXT
3173          *      Revision::DELETED_COMMENT
3174          *      Revision::DELETED_USER
3175          *      Revision::DELETED_RESTRICTED
3176          * @param $id int article ID
3177          * @param $commit boolean defaults to true, triggers transaction end
3178          * @return boolean true if successful
3179          */
3180         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
3181                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3182
3183                 wfDebug( __METHOD__ . "\n" );
3184
3185                 $dbw = wfGetDB( DB_MASTER );
3186                 $ns = $this->mTitle->getNamespace();
3187                 $t = $this->mTitle->getDBkey();
3188                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3189
3190                 if ( $t === '' || $id == 0 ) {
3191                         return false;
3192                 }
3193
3194                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3195                 array_push( $wgDeferredUpdateList, $u );
3196
3197                 // Bitfields to further suppress the content
3198                 if ( $suppress ) {
3199                         $bitfield = 0;
3200                         // This should be 15...
3201                         $bitfield |= Revision::DELETED_TEXT;
3202                         $bitfield |= Revision::DELETED_COMMENT;
3203                         $bitfield |= Revision::DELETED_USER;
3204                         $bitfield |= Revision::DELETED_RESTRICTED;
3205                 } else {
3206                         $bitfield = 'rev_deleted';
3207                 }
3208
3209                 $dbw->begin();
3210                 // For now, shunt the revision data into the archive table.
3211                 // Text is *not* removed from the text table; bulk storage
3212                 // is left intact to avoid breaking block-compression or
3213                 // immutable storage schemes.
3214                 //
3215                 // For backwards compatibility, note that some older archive
3216                 // table entries will have ar_text and ar_flags fields still.
3217                 //
3218                 // In the future, we may keep revisions and mark them with
3219                 // the rev_deleted field, which is reserved for this purpose.
3220                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3221                         array(
3222                                 'ar_namespace'  => 'page_namespace',
3223                                 'ar_title'      => 'page_title',
3224                                 'ar_comment'    => 'rev_comment',
3225                                 'ar_user'       => 'rev_user',
3226                                 'ar_user_text'  => 'rev_user_text',
3227                                 'ar_timestamp'  => 'rev_timestamp',
3228                                 'ar_minor_edit' => 'rev_minor_edit',
3229                                 'ar_rev_id'     => 'rev_id',
3230                                 'ar_text_id'    => 'rev_text_id',
3231                                 'ar_text'       => '\'\'', // Be explicit to appease
3232                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3233                                 'ar_len'        => 'rev_len',
3234                                 'ar_page_id'    => 'page_id',
3235                                 'ar_deleted'    => $bitfield
3236                         ), array(
3237                                 'page_id' => $id,
3238                                 'page_id = rev_page'
3239                         ), __METHOD__
3240                 );
3241
3242                 # Delete restrictions for it
3243                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3244
3245                 # Now that it's safely backed up, delete it
3246                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3247                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3248
3249                 if ( !$ok ) {
3250                         $dbw->rollback();
3251                         return false;
3252                 }
3253
3254                 # Fix category table counts
3255                 $cats = array();
3256                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3257
3258                 foreach ( $res as $row ) {
3259                         $cats [] = $row->cl_to;
3260                 }
3261
3262                 $this->updateCategoryCounts( array(), $cats );
3263
3264                 # If using cascading deletes, we can skip some explicit deletes
3265                 if ( !$dbw->cascadingDeletes() ) {
3266                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3267
3268                         if ( $wgUseTrackbacks )
3269                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3270
3271                         # Delete outgoing links
3272                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3273                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3274                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3275                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3276                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3277                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3278                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3279                 }
3280
3281                 # If using cleanup triggers, we can skip some manual deletes
3282                 if ( !$dbw->cleanupTriggers() ) {
3283                         # Clean up recentchanges entries...
3284                         $dbw->delete( 'recentchanges',
3285                                 array( 'rc_type != ' . RC_LOG,
3286                                         'rc_namespace' => $this->mTitle->getNamespace(),
3287                                         'rc_title' => $this->mTitle->getDBkey() ),
3288                                 __METHOD__ );
3289                         $dbw->delete( 'recentchanges',
3290                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3291                                 __METHOD__ );
3292                 }
3293
3294                 # Clear caches
3295                 Article::onArticleDelete( $this->mTitle );
3296
3297                 # Clear the cached article id so the interface doesn't act like we exist
3298                 $this->mTitle->resetArticleID( 0 );
3299
3300                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3301                 $logtype = $suppress ? 'suppress' : 'delete';
3302                 $log = new LogPage( $logtype );
3303
3304                 # Make sure logging got through
3305                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3306
3307                 if ( $commit ) {
3308                         $dbw->commit();
3309                 }
3310
3311                 return true;
3312         }
3313
3314         /**
3315          * Roll back the most recent consecutive set of edits to a page
3316          * from the same user; fails if there are no eligible edits to
3317          * roll back to, e.g. user is the sole contributor. This function
3318          * performs permissions checks on $wgUser, then calls commitRollback()
3319          * to do the dirty work
3320          *
3321          * @param $fromP String: Name of the user whose edits to rollback.
3322          * @param $summary String: Custom summary. Set to default summary if empty.
3323          * @param $token String: Rollback token.
3324          * @param $bot Boolean: If true, mark all reverted edits as bot.
3325          *
3326          * @param $resultDetails Array: contains result-specific array of additional values
3327          *    'alreadyrolled' : 'current' (rev)
3328          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3329          *
3330          * @return array of errors, each error formatted as
3331          *   array(messagekey, param1, param2, ...).
3332          * On success, the array is empty.  This array can also be passed to
3333          * OutputPage::showPermissionsErrorPage().
3334          */
3335         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3336                 global $wgUser;
3337
3338                 $resultDetails = null;
3339
3340                 # Check permissions
3341                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3342                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3343                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3344
3345                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3346                         $errors[] = array( 'sessionfailure' );
3347                 }
3348
3349                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3350                         $errors[] = array( 'actionthrottledtext' );
3351                 }
3352
3353                 # If there were errors, bail out now
3354                 if ( !empty( $errors ) ) {
3355                         return $errors;
3356                 }
3357
3358                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3359         }
3360
3361         /**
3362          * Backend implementation of doRollback(), please refer there for parameter
3363          * and return value documentation
3364          *
3365          * NOTE: This function does NOT check ANY permissions, it just commits the
3366          * rollback to the DB Therefore, you should only call this function direct-
3367          * ly if you want to use custom permissions checks. If you don't, use
3368          * doRollback() instead.
3369          */
3370         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3371                 global $wgUseRCPatrol, $wgUser, $wgLang;
3372
3373                 $dbw = wfGetDB( DB_MASTER );
3374
3375                 if ( wfReadOnly() ) {
3376                         return array( array( 'readonlytext' ) );
3377                 }
3378
3379                 # Get the last editor
3380                 $current = Revision::newFromTitle( $this->mTitle );
3381                 if ( is_null( $current ) ) {
3382                         # Something wrong... no page?
3383                         return array( array( 'notanarticle' ) );
3384                 }
3385
3386                 $from = str_replace( '_', ' ', $fromP );
3387                 # User name given should match up with the top revision.
3388                 # If the user was deleted then $from should be empty.
3389                 if ( $from != $current->getUserText() ) {
3390                         $resultDetails = array( 'current' => $current );
3391                         return array( array( 'alreadyrolled',
3392                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3393                                 htmlspecialchars( $fromP ),
3394                                 htmlspecialchars( $current->getUserText() )
3395                         ) );
3396                 }
3397
3398                 # Get the last edit not by this guy...
3399                 # Note: these may not be public values
3400                 $user = intval( $current->getRawUser() );
3401                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3402                 $s = $dbw->selectRow( 'revision',
3403                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3404                         array( 'rev_page' => $current->getPage(),
3405                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3406                         ), __METHOD__,
3407                         array( 'USE INDEX' => 'page_timestamp',
3408                                 'ORDER BY' => 'rev_timestamp DESC' )
3409                         );
3410                 if ( $s === false ) {
3411                         # No one else ever edited this page
3412                         return array( array( 'cantrollback' ) );
3413                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3414                         # Only admins can see this text
3415                         return array( array( 'notvisiblerev' ) );
3416                 }
3417
3418                 $set = array();
3419                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3420                         # Mark all reverted edits as bot
3421                         $set['rc_bot'] = 1;
3422                 }
3423
3424                 if ( $wgUseRCPatrol ) {
3425                         # Mark all reverted edits as patrolled
3426                         $set['rc_patrolled'] = 1;
3427                 }
3428
3429                 if ( count( $set ) ) {
3430                         $dbw->update( 'recentchanges', $set,
3431                                 array( /* WHERE */
3432                                         'rc_cur_id' => $current->getPage(),
3433                                         'rc_user_text' => $current->getUserText(),
3434                                         "rc_timestamp > '{$s->rev_timestamp}'",
3435                                 ), __METHOD__
3436                         );
3437                 }
3438
3439                 # Generate the edit summary if necessary
3440                 $target = Revision::newFromId( $s->rev_id );
3441                 if ( empty( $summary ) ) {
3442                         if ( $from == '' ) { // no public user name
3443                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3444                         } else {
3445                                 $summary = wfMsgForContent( 'revertpage' );
3446                         }
3447                 }
3448
3449                 # Allow the custom summary to use the same args as the default message
3450                 $args = array(
3451                         $target->getUserText(), $from, $s->rev_id,
3452                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3453                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3454                 );
3455                 $summary = wfMsgReplaceArgs( $summary, $args );
3456
3457                 # Save
3458                 $flags = EDIT_UPDATE;
3459
3460                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3461                         $flags |= EDIT_MINOR;
3462                 }
3463
3464                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) ) {
3465                         $flags |= EDIT_FORCE_BOT;
3466                 }
3467
3468                 # Actually store the edit
3469                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3470                 if ( !empty( $status->value['revision'] ) ) {
3471                         $revId = $status->value['revision']->getId();
3472                 } else {
3473                         $revId = false;
3474                 }
3475
3476                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3477
3478                 $resultDetails = array(
3479                         'summary' => $summary,
3480                         'current' => $current,
3481                         'target'  => $target,
3482                         'newid'   => $revId
3483                 );
3484
3485                 return array();
3486         }
3487
3488         /**
3489          * User interface for rollback operations
3490          */
3491         public function rollback() {
3492                 global $wgUser, $wgOut, $wgRequest;
3493
3494                 $details = null;
3495
3496                 $result = $this->doRollback(
3497                         $wgRequest->getVal( 'from' ),
3498                         $wgRequest->getText( 'summary' ),
3499                         $wgRequest->getVal( 'token' ),
3500                         $wgRequest->getBool( 'bot' ),
3501                         $details
3502                 );
3503
3504                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3505                         $wgOut->rateLimited();
3506                         return;
3507                 }
3508
3509                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3510                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3511                         $errArray = $result[0];
3512                         $errMsg = array_shift( $errArray );
3513                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3514
3515                         if ( isset( $details['current'] ) ) {
3516                                 $current = $details['current'];
3517
3518                                 if ( $current->getComment() != '' ) {
3519                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3520                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3521                                 }
3522                         }
3523
3524                         return;
3525                 }
3526
3527                 # Display permissions errors before read-only message -- there's no
3528                 # point in misleading the user into thinking the inability to rollback
3529                 # is only temporary.
3530                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3531                         # array_diff is completely broken for arrays of arrays, sigh.
3532                         # Remove any 'readonlytext' error manually.
3533                         $out = array();
3534                         foreach ( $result as $error ) {
3535                                 if ( $error != array( 'readonlytext' ) ) {
3536                                         $out [] = $error;
3537                                 }
3538                         }
3539                         $wgOut->showPermissionsErrorPage( $out );
3540
3541                         return;
3542                 }
3543
3544                 if ( $result == array( array( 'readonlytext' ) ) ) {
3545                         $wgOut->readOnlyPage();
3546
3547                         return;
3548                 }
3549
3550                 $current = $details['current'];
3551                 $target = $details['target'];
3552                 $newId = $details['newid'];
3553                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3554                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3555
3556                 if ( $current->getUserText() === '' ) {
3557                         $old = wfMsg( 'rev-deleted-user' );
3558                 } else {
3559                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3560                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3561                 }
3562
3563                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3564                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3565                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3566                 $wgOut->returnToMain( false, $this->mTitle );
3567
3568                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3569                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3570                         $de->showDiff( '', '' );
3571                 }
3572         }
3573
3574         /**
3575          * Do standard deferred updates after page view
3576          */
3577         public function viewUpdates() {
3578                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3579                 if ( wfReadOnly() ) {
3580                         return;
3581                 }
3582
3583                 # Don't update page view counters on views from bot users (bug 14044)
3584                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3585                         Article::incViewCount( $this->getID() );
3586                         $u = new SiteStatsUpdate( 1, 0, 0 );
3587                         array_push( $wgDeferredUpdateList, $u );
3588                 }
3589
3590                 # Update newtalk / watchlist notification status
3591                 $wgUser->clearNotification( $this->mTitle );
3592         }
3593
3594         /**
3595          * Prepare text which is about to be saved.
3596          * Returns a stdclass with source, pst and output members
3597          */
3598         public function prepareTextForEdit( $text, $revid = null ) {
3599                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3600                         // Already prepared
3601                         return $this->mPreparedEdit;
3602                 }
3603
3604                 global $wgParser;
3605
3606                 $edit = (object)array();
3607                 $edit->revid = $revid;
3608                 $edit->newText = $text;
3609                 $edit->pst = $this->preSaveTransform( $text );
3610                 $options = $this->getParserOptions();
3611                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3612                 $edit->oldText = $this->getContent();
3613
3614                 $this->mPreparedEdit = $edit;
3615
3616                 return $edit;
3617         }
3618
3619         /**
3620          * Do standard deferred updates after page edit.
3621          * Update links tables, site stats, search index and message cache.
3622          * Purges pages that include this page if the text was changed here.
3623          * Every 100th edit, prune the recent changes table.
3624          *
3625          * @private
3626          * @param $text New text of the article
3627          * @param $summary Edit summary
3628          * @param $minoredit Minor edit
3629          * @param $timestamp_of_pagechange Timestamp associated with the page change
3630          * @param $newid rev_id value of the new revision
3631          * @param $changed Whether or not the content actually changed
3632          */
3633         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3634                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3635
3636                 wfProfileIn( __METHOD__ );
3637
3638                 # Parse the text
3639                 # Be careful not to double-PST: $text is usually already PST-ed once
3640                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3641                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3642                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3643                 } else {
3644                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3645                         $editInfo = $this->mPreparedEdit;
3646                 }
3647
3648                 # Save it to the parser cache
3649                 if ( $wgEnableParserCache ) {
3650                         $popts = $this->getParserOptions();
3651                         $parserCache = ParserCache::singleton();
3652                         $parserCache->save( $editInfo->output, $this, $popts );
3653                 }
3654
3655                 # Update the links tables
3656                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3657                 $u->doUpdate();
3658
3659                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3660
3661                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3662                         if ( 0 == mt_rand( 0, 99 ) ) {
3663                                 // Flush old entries from the `recentchanges` table; we do this on
3664                                 // random requests so as to avoid an increase in writes for no good reason
3665                                 global $wgRCMaxAge;
3666
3667                                 $dbw = wfGetDB( DB_MASTER );
3668                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3669                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3670                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3671
3672                                 $dbw->query( $sql );
3673                         }
3674                 }
3675
3676                 $id = $this->getID();
3677                 $title = $this->mTitle->getPrefixedDBkey();
3678                 $shortTitle = $this->mTitle->getDBkey();
3679
3680                 if ( 0 == $id ) {
3681                         wfProfileOut( __METHOD__ );
3682                         return;
3683                 }
3684
3685                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3686                 array_push( $wgDeferredUpdateList, $u );
3687                 $u = new SearchUpdate( $id, $title, $text );
3688                 array_push( $wgDeferredUpdateList, $u );
3689
3690                 # If this is another user's talk page, update newtalk
3691                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3692                 # load of user talk pages and piss people off, nor if it's a minor edit
3693                 # by a properly-flagged bot.
3694                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3695                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3696                 ) {
3697                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3698                                 $other = User::newFromName( $shortTitle, false );
3699                                 if ( !$other ) {
3700                                         wfDebug( __METHOD__ . ": invalid username\n" );
3701                                 } elseif ( User::isIP( $shortTitle ) ) {
3702                                         // An anonymous user
3703                                         $other->setNewtalk( true );
3704                                 } elseif ( $other->isLoggedIn() ) {
3705                                         $other->setNewtalk( true );
3706                                 } else {
3707                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3708                                 }
3709                         }
3710                 }
3711
3712                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3713                         $wgMessageCache->replace( $shortTitle, $text );
3714                 }
3715
3716                 wfProfileOut( __METHOD__ );
3717         }
3718
3719         /**
3720          * Perform article updates on a special page creation.
3721          *
3722          * @param $rev Revision object
3723          *
3724          * @todo This is a shitty interface function. Kill it and replace the
3725          * other shitty functions like editUpdates and such so it's not needed
3726          * anymore.
3727          */
3728         public function createUpdates( $rev ) {
3729                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3730                 $this->mTotalAdjustment = 1;
3731                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3732                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3733         }
3734
3735         /**
3736          * Generate the navigation links when browsing through an article revisions
3737          * It shows the information as:
3738          *   Revision as of \<date\>; view current revision
3739          *   \<- Previous version | Next Version -\>
3740          *
3741          * @param $oldid String: revision ID of this article revision
3742          */
3743         public function setOldSubtitle( $oldid = 0 ) {
3744                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3745
3746                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3747                         return;
3748                 }
3749
3750                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3751
3752                 # Cascade unhide param in links for easy deletion browsing
3753                 $extraParams = array();
3754                 if ( $wgRequest->getVal( 'unhide' ) ) {
3755                         $extraParams['unhide'] = 1;
3756                 }
3757
3758                 $revision = Revision::newFromId( $oldid );
3759
3760                 $current = ( $oldid == $this->mLatest );
3761                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3762                 $tddate = $wgLang->date( $this->mTimestamp, true );
3763                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3764                 $sk = $wgUser->getSkin();
3765                 $lnk = $current
3766                         ? wfMsgHtml( 'currentrevisionlink' )
3767                         : $sk->link(
3768                                 $this->mTitle,
3769                                 wfMsgHtml( 'currentrevisionlink' ),
3770                                 array(),
3771                                 $extraParams,
3772                                 array( 'known', 'noclasses' )
3773                         );
3774                 $curdiff = $current
3775                         ? wfMsgHtml( 'diff' )
3776                         : $sk->link(
3777                                 $this->mTitle,
3778                                 wfMsgHtml( 'diff' ),
3779                                 array(),
3780                                 array(
3781                                         'diff' => 'cur',
3782                                         'oldid' => $oldid
3783                                 ) + $extraParams,
3784                                 array( 'known', 'noclasses' )
3785                         );
3786                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3787                 $prevlink = $prev
3788                         ? $sk->link(
3789                                 $this->mTitle,
3790                                 wfMsgHtml( 'previousrevision' ),
3791                                 array(),
3792                                 array(
3793                                         'direction' => 'prev',
3794                                         'oldid' => $oldid
3795                                 ) + $extraParams,
3796                                 array( 'known', 'noclasses' )
3797                         )
3798                         : wfMsgHtml( 'previousrevision' );
3799                 $prevdiff = $prev
3800                         ? $sk->link(
3801                                 $this->mTitle,
3802                                 wfMsgHtml( 'diff' ),
3803                                 array(),
3804                                 array(
3805                                         'diff' => 'prev',
3806                                         'oldid' => $oldid
3807                                 ) + $extraParams,
3808                                 array( 'known', 'noclasses' )
3809                         )
3810                         : wfMsgHtml( 'diff' );
3811                 $nextlink = $current
3812                         ? wfMsgHtml( 'nextrevision' )
3813                         : $sk->link(
3814                                 $this->mTitle,
3815                                 wfMsgHtml( 'nextrevision' ),
3816                                 array(),
3817                                 array(
3818                                         'direction' => 'next',
3819                                         'oldid' => $oldid
3820                                 ) + $extraParams,
3821                                 array( 'known', 'noclasses' )
3822                         );
3823                 $nextdiff = $current
3824                         ? wfMsgHtml( 'diff' )
3825                         : $sk->link(
3826                                 $this->mTitle,
3827                                 wfMsgHtml( 'diff' ),
3828                                 array(),
3829                                 array(
3830                                         'diff' => 'next',
3831                                         'oldid' => $oldid
3832                                 ) + $extraParams,
3833                                 array( 'known', 'noclasses' )
3834                         );
3835
3836                 $cdel = '';
3837
3838                 // User can delete revisions or view deleted revisions...
3839                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3840                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3841                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3842                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3843                         } else {
3844                                 $query = array(
3845                                         'type'   => 'revision',
3846                                         'target' => $this->mTitle->getPrefixedDbkey(),
3847                                         'ids'    => $oldid
3848                                 );
3849                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3850                         }
3851                         $cdel .= ' ';
3852                 }
3853
3854                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3855                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3856
3857                 $m = wfMsg( 'revision-info-current' );
3858                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3859                         ? 'revision-info-current'
3860                         : 'revision-info';
3861
3862                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3863                         wfMsgExt(
3864                                 $infomsg,
3865                                 array( 'parseinline', 'replaceafter' ),
3866                                 $td,
3867                                 $userlinks,
3868                                 $revision->getID(),
3869                                 $tddate,
3870                                 $tdtime,
3871                                 $revision->getUser()
3872                         ) .
3873                         "</div>\n" .
3874                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3875                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3876
3877                 $wgOut->setSubtitle( $r );
3878         }
3879
3880         /**
3881          * This function is called right before saving the wikitext,
3882          * so we can do things like signatures and links-in-context.
3883          *
3884          * @param $text String article contents
3885          * @return string article contents with altered wikitext markup (signatures
3886          *      converted, {{subst:}}, templates, etc.)
3887          */
3888         public function preSaveTransform( $text ) {
3889                 global $wgParser, $wgUser;
3890
3891                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3892         }
3893
3894         /* Caching functions */
3895
3896         /**
3897          * checkLastModified returns true if it has taken care of all
3898          * output to the client that is necessary for this request.
3899          * (that is, it has sent a cached version of the page)
3900          *
3901          * @return boolean true if cached version send, false otherwise
3902          */
3903         protected function tryFileCache() {
3904                 static $called = false;
3905
3906                 if ( $called ) {
3907                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3908                         return false;
3909                 }
3910
3911                 $called = true;
3912                 if ( $this->isFileCacheable() ) {
3913                         $cache = new HTMLFileCache( $this->mTitle );
3914                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3915                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3916                                 $cache->loadFromFileCache();
3917                                 return true;
3918                         } else {
3919                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3920                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3921                         }
3922                 } else {
3923                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3924                 }
3925
3926                 return false;
3927         }
3928
3929         /**
3930          * Check if the page can be cached
3931          * @return bool
3932          */
3933         public function isFileCacheable() {
3934                 $cacheable = false;
3935
3936                 if ( HTMLFileCache::useFileCache() ) {
3937                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3938                         // Extension may have reason to disable file caching on some pages.
3939                         if ( $cacheable ) {
3940                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3941                         }
3942                 }
3943
3944                 return $cacheable;
3945         }
3946
3947         /**
3948          * Loads page_touched and returns a value indicating if it should be used
3949          * @return boolean true if not a redirect
3950          */
3951         public function checkTouched() {
3952                 if ( !$this->mDataLoaded ) {
3953                         $this->loadPageData();
3954                 }
3955
3956                 return !$this->mIsRedirect;
3957         }
3958
3959         /**
3960          * Get the page_touched field
3961          * @return string containing GMT timestamp
3962          */
3963         public function getTouched() {
3964                 if ( !$this->mDataLoaded ) {
3965                         $this->loadPageData();
3966                 }
3967
3968                 return $this->mTouched;
3969         }
3970
3971         /**
3972          * Get the page_latest field
3973          * @return integer rev_id of current revision
3974          */
3975         public function getLatest() {
3976                 if ( !$this->mDataLoaded ) {
3977                         $this->loadPageData();
3978                 }
3979
3980                 return (int)$this->mLatest;
3981         }
3982
3983         /**
3984          * Edit an article without doing all that other stuff
3985          * The article must already exist; link tables etc
3986          * are not updated, caches are not flushed.
3987          *
3988          * @param $text String: text submitted
3989          * @param $comment String: comment submitted
3990          * @param $minor Boolean: whereas it's a minor modification
3991          */
3992         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3993                 wfProfileIn( __METHOD__ );
3994
3995                 $dbw = wfGetDB( DB_MASTER );
3996                 $revision = new Revision( array(
3997                         'page'       => $this->getId(),
3998                         'text'       => $text,
3999                         'comment'    => $comment,
4000                         'minor_edit' => $minor ? 1 : 0,
4001                         ) );
4002                 $revision->insertOn( $dbw );
4003                 $this->updateRevisionOn( $dbw, $revision );
4004
4005                 global $wgUser;
4006                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
4007
4008                 wfProfileOut( __METHOD__ );
4009         }
4010
4011         /**
4012          * Used to increment the view counter
4013          *
4014          * @param $id Integer: article id
4015          */
4016         public static function incViewCount( $id ) {
4017                 $id = intval( $id );
4018
4019                 global $wgHitcounterUpdateFreq;
4020
4021                 $dbw = wfGetDB( DB_MASTER );
4022                 $pageTable = $dbw->tableName( 'page' );
4023                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
4024                 $acchitsTable = $dbw->tableName( 'acchits' );
4025                 $dbType = $dbw->getType();
4026
4027                 if ( $wgHitcounterUpdateFreq <= 1 || $dbType == 'sqlite' ) {
4028                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
4029
4030                         return;
4031                 }
4032
4033                 # Not important enough to warrant an error page in case of failure
4034                 $oldignore = $dbw->ignoreErrors( true );
4035
4036                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
4037
4038                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
4039                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
4040                         # Most of the time (or on SQL errors), skip row count check
4041                         $dbw->ignoreErrors( $oldignore );
4042
4043                         return;
4044                 }
4045
4046                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
4047                 $row = $dbw->fetchObject( $res );
4048                 $rown = intval( $row->n );
4049
4050                 if ( $rown >= $wgHitcounterUpdateFreq ) {
4051                         wfProfileIn( 'Article::incViewCount-collect' );
4052                         $old_user_abort = ignore_user_abort( true );
4053
4054                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
4055                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
4056                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
4057                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
4058                                 'GROUP BY hc_id', __METHOD__ );
4059                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
4060                         $dbw->unlockTables( __METHOD__ );
4061
4062                         if ( $dbType == 'mysql' ) {
4063                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
4064                                         'WHERE page_id = hc_id', __METHOD__ );
4065                         } else {
4066                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
4067                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
4068                         }
4069                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
4070
4071                         ignore_user_abort( $old_user_abort );
4072                         wfProfileOut( 'Article::incViewCount-collect' );
4073                 }
4074
4075                 $dbw->ignoreErrors( $oldignore );
4076         }
4077
4078         /**#@+
4079          * The onArticle*() functions are supposed to be a kind of hooks
4080          * which should be called whenever any of the specified actions
4081          * are done.
4082          *
4083          * This is a good place to put code to clear caches, for instance.
4084          *
4085          * This is called on page move and undelete, as well as edit
4086          *
4087          * @param $title a title object
4088          */
4089         public static function onArticleCreate( $title ) {
4090                 # Update existence markers on article/talk tabs...
4091                 if ( $title->isTalkPage() ) {
4092                         $other = $title->getSubjectPage();
4093                 } else {
4094                         $other = $title->getTalkPage();
4095                 }
4096
4097                 $other->invalidateCache();
4098                 $other->purgeSquid();
4099
4100                 $title->touchLinks();
4101                 $title->purgeSquid();
4102                 $title->deleteTitleProtection();
4103         }
4104
4105         /**
4106          * Clears caches when article is deleted
4107          */
4108         public static function onArticleDelete( $title ) {
4109                 global $wgMessageCache;
4110
4111                 # Update existence markers on article/talk tabs...
4112                 if ( $title->isTalkPage() ) {
4113                         $other = $title->getSubjectPage();
4114                 } else {
4115                         $other = $title->getTalkPage();
4116                 }
4117
4118                 $other->invalidateCache();
4119                 $other->purgeSquid();
4120
4121                 $title->touchLinks();
4122                 $title->purgeSquid();
4123
4124                 # File cache
4125                 HTMLFileCache::clearFileCache( $title );
4126
4127                 # Messages
4128                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4129                         $wgMessageCache->replace( $title->getDBkey(), false );
4130                 }
4131
4132                 # Images
4133                 if ( $title->getNamespace() == NS_FILE ) {
4134                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4135                         $update->doUpdate();
4136                 }
4137
4138                 # User talk pages
4139                 if ( $title->getNamespace() == NS_USER_TALK ) {
4140                         $user = User::newFromName( $title->getText(), false );
4141                         $user->setNewtalk( false );
4142                 }
4143
4144                 # Image redirects
4145                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4146         }
4147
4148         /**
4149          * Purge caches on page update etc
4150          *
4151          * @param $title Title object
4152          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4153          */
4154         public static function onArticleEdit( $title ) {
4155                 global $wgDeferredUpdateList;
4156
4157                 // Invalidate caches of articles which include this page
4158                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4159
4160                 // Invalidate the caches of all pages which redirect here
4161                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4162
4163                 # Purge squid for this page only
4164                 $title->purgeSquid();
4165
4166                 # Clear file cache for this page only
4167                 HTMLFileCache::clearFileCache( $title );
4168         }
4169
4170         /**#@-*/
4171
4172         /**
4173          * Overriden by ImagePage class, only present here to avoid a fatal error
4174          * Called for ?action=revert
4175          */
4176         public function revert() {
4177                 global $wgOut;
4178                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4179         }
4180
4181         /**
4182          * Info about this page
4183          * Called for ?action=info when $wgAllowPageInfo is on.
4184          */
4185         public function info() {
4186                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4187
4188                 if ( !$wgAllowPageInfo ) {
4189                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4190                         return;
4191                 }
4192
4193                 $page = $this->mTitle->getSubjectPage();
4194
4195                 $wgOut->setPagetitle( $page->getPrefixedText() );
4196                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4197                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4198
4199                 if ( !$this->mTitle->exists() ) {
4200                         $wgOut->addHTML( '<div class="noarticletext">' );
4201                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4202                                 // This doesn't quite make sense; the user is asking for
4203                                 // information about the _page_, not the message... -- RC
4204                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
4205                         } else {
4206                                 $msg = $wgUser->isLoggedIn()
4207                                         ? 'noarticletext'
4208                                         : 'noarticletextanon';
4209                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4210                         }
4211
4212                         $wgOut->addHTML( '</div>' );
4213                 } else {
4214                         $dbr = wfGetDB( DB_SLAVE );
4215                         $wl_clause = array(
4216                                 'wl_title'     => $page->getDBkey(),
4217                                 'wl_namespace' => $page->getNamespace() );
4218                         $numwatchers = $dbr->selectField(
4219                                 'watchlist',
4220                                 'COUNT(*)',
4221                                 $wl_clause,
4222                                 __METHOD__,
4223                                 $this->getSelectOptions() );
4224
4225                         $pageInfo = $this->pageCountInfo( $page );
4226                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4227
4228
4229                         //FIXME: unescaped messages
4230                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4231                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4232
4233                         if ( $talkInfo ) {
4234                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4235                         }
4236
4237                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4238
4239                         if ( $talkInfo ) {
4240                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4241                         }
4242
4243                         $wgOut->addHTML( '</ul>' );
4244                 }
4245         }
4246
4247         /**
4248          * Return the total number of edits and number of unique editors
4249          * on a given page. If page does not exist, returns false.
4250          *
4251          * @param $title Title object
4252          * @return mixed array or boolean false
4253          */
4254         public function pageCountInfo( $title ) {
4255                 $id = $title->getArticleId();
4256
4257                 if ( $id == 0 ) {
4258                         return false;
4259                 }
4260
4261                 $dbr = wfGetDB( DB_SLAVE );
4262                 $rev_clause = array( 'rev_page' => $id );
4263                 $edits = $dbr->selectField(
4264                         'revision',
4265                         'COUNT(rev_page)',
4266                         $rev_clause,
4267                         __METHOD__,
4268                         $this->getSelectOptions()
4269                 );
4270                 $authors = $dbr->selectField(
4271                         'revision',
4272                         'COUNT(DISTINCT rev_user_text)',
4273                         $rev_clause,
4274                         __METHOD__,
4275                         $this->getSelectOptions()
4276                 );
4277
4278                 return array( 'edits' => $edits, 'authors' => $authors );
4279         }
4280
4281         /**
4282          * Return a list of templates used by this article.
4283          * Uses the templatelinks table
4284          *
4285          * @return Array of Title objects
4286          */
4287         public function getUsedTemplates() {
4288                 $result = array();
4289                 $id = $this->mTitle->getArticleID();
4290
4291                 if ( $id == 0 ) {
4292                         return array();
4293                 }
4294
4295                 $dbr = wfGetDB( DB_SLAVE );
4296                 $res = $dbr->select( array( 'templatelinks' ),
4297                         array( 'tl_namespace', 'tl_title' ),
4298                         array( 'tl_from' => $id ),
4299                         __METHOD__ );
4300
4301                 if ( $res !== false ) {
4302                         foreach ( $res as $row ) {
4303                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4304                         }
4305                 }
4306
4307                 $dbr->freeResult( $res );
4308
4309                 return $result;
4310         }
4311
4312         /**
4313          * Returns a list of hidden categories this page is a member of.
4314          * Uses the page_props and categorylinks tables.
4315          *
4316          * @return Array of Title objects
4317          */
4318         public function getHiddenCategories() {
4319                 $result = array();
4320                 $id = $this->mTitle->getArticleID();
4321
4322                 if ( $id == 0 ) {
4323                         return array();
4324                 }
4325
4326                 $dbr = wfGetDB( DB_SLAVE );
4327                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4328                         array( 'cl_to' ),
4329                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4330                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4331                         __METHOD__ );
4332
4333                 if ( $res !== false ) {
4334                         foreach ( $res as $row ) {
4335                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4336                         }
4337                 }
4338
4339                 $dbr->freeResult( $res );
4340
4341                 return $result;
4342         }
4343
4344         /**
4345         * Return an applicable autosummary if one exists for the given edit.
4346         * @param $oldtext String: the previous text of the page.
4347         * @param $newtext String: The submitted text of the page.
4348         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4349         * @return string An appropriate autosummary, or an empty string.
4350         */
4351         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4352                 global $wgContLang;
4353
4354                 # Decide what kind of autosummary is needed.
4355
4356                 # Redirect autosummaries
4357                 $ot = Title::newFromRedirect( $oldtext );
4358                 $rt = Title::newFromRedirect( $newtext );
4359
4360                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4361                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4362                 }
4363
4364                 # New page autosummaries
4365                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4366                         # If they're making a new article, give its text, truncated, in the summary.
4367
4368                         $truncatedtext = $wgContLang->truncate(
4369                                 str_replace( "\n", ' ', $newtext ),
4370                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4371
4372                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4373                 }
4374
4375                 # Blanking autosummaries
4376                 if ( $oldtext != '' && $newtext == '' ) {
4377                         return wfMsgForContent( 'autosumm-blank' );
4378                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4379                         # Removing more than 90% of the article
4380
4381                         $truncatedtext = $wgContLang->truncate(
4382                                 $newtext,
4383                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4384
4385                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4386                 }
4387
4388                 # If we reach this point, there's no applicable autosummary for our case, so our
4389                 # autosummary is empty.
4390                 return '';
4391         }
4392
4393         /**
4394          * Add the primary page-view wikitext to the output buffer
4395          * Saves the text into the parser cache if possible.
4396          * Updates templatelinks if it is out of date.
4397          *
4398          * @param $text String
4399          * @param $cache Boolean
4400          * @param $parserOptions mixed ParserOptions object, or boolean false
4401          */
4402         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4403                 global $wgOut;
4404
4405                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4406                 $wgOut->addParserOutput( $this->mParserOutput );
4407         }
4408
4409         /**
4410          * This does all the heavy lifting for outputWikitext, except it returns the parser
4411          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4412          * say, embedding thread pages within a discussion system (LiquidThreads)
4413          *
4414          * @param $text string
4415          * @param $cache boolean
4416          * @param $parserOptions parsing options, defaults to false
4417          * @return string containing parsed output
4418          */
4419         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4420                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4421
4422                 if ( !$parserOptions ) {
4423                         $parserOptions = $this->getParserOptions();
4424                 }
4425
4426                 $time = - wfTime();
4427                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4428                         $parserOptions, true, true, $this->getRevIdFetched() );
4429                 $time += wfTime();
4430
4431                 # Timing hack
4432                 if ( $time > 3 ) {
4433                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4434                                 $this->mTitle->getPrefixedDBkey() ) );
4435                 }
4436
4437                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4438                         $parserCache = ParserCache::singleton();
4439                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4440                 }
4441
4442                 // Make sure file cache is not used on uncacheable content.
4443                 // Output that has magic words in it can still use the parser cache
4444                 // (if enabled), though it will generally expire sooner.
4445                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4446                         $wgUseFileCache = false;
4447                 }
4448
4449                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4450
4451                 return $this->mParserOutput;
4452         }
4453
4454         /**
4455          * Get parser options suitable for rendering the primary article wikitext
4456          * @return mixed ParserOptions object or boolean false
4457          */
4458         public function getParserOptions() {
4459                 global $wgUser;
4460
4461                 if ( !$this->mParserOptions ) {
4462                         $this->mParserOptions = new ParserOptions( $wgUser );
4463                         $this->mParserOptions->setTidy( true );
4464                         $this->mParserOptions->enableLimitReport();
4465                 }
4466
4467                 return $this->mParserOptions;
4468         }
4469
4470         /**
4471          * Updates cascading protections
4472          *
4473          * @param $parserOutput mixed ParserOptions object, or boolean false
4474          **/
4475
4476         protected function doCascadeProtectionUpdates( $parserOutput ) {
4477                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4478                         return;
4479                 }
4480
4481                 // templatelinks table may have become out of sync,
4482                 // especially if using variable-based transclusions.
4483                 // For paranoia, check if things have changed and if
4484                 // so apply updates to the database. This will ensure
4485                 // that cascaded protections apply as soon as the changes
4486                 // are visible.
4487
4488                 # Get templates from templatelinks
4489                 $id = $this->mTitle->getArticleID();
4490
4491                 $tlTemplates = array();
4492
4493                 $dbr = wfGetDB( DB_SLAVE );
4494                 $res = $dbr->select( array( 'templatelinks' ),
4495                         array( 'tl_namespace', 'tl_title' ),
4496                         array( 'tl_from' => $id ),
4497                         __METHOD__
4498                 );
4499
4500                 foreach ( $res as $row ) {
4501                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4502                 }
4503
4504                 # Get templates from parser output.
4505                 $poTemplates = array();
4506                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4507                         foreach ( $templates as $dbk => $id ) {
4508                                 $poTemplates["$ns:$dbk"] = true;
4509                         }
4510                 }
4511
4512                 # Get the diff
4513                 # Note that we simulate array_diff_key in PHP <5.0.x
4514                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4515
4516                 if ( count( $templates_diff ) > 0 ) {
4517                         # Whee, link updates time.
4518                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4519                         $u->doUpdate();
4520                 }
4521         }
4522
4523         /**
4524          * Update all the appropriate counts in the category table, given that
4525          * we've added the categories $added and deleted the categories $deleted.
4526          *
4527          * @param $added array   The names of categories that were added
4528          * @param $deleted array The names of categories that were deleted
4529          */
4530         public function updateCategoryCounts( $added, $deleted ) {
4531                 $ns = $this->mTitle->getNamespace();
4532                 $dbw = wfGetDB( DB_MASTER );
4533
4534                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4535                 # exist, we might legitimately not create it, but it's simpler to just
4536                 # create it and then give it a negative value, since the value is bogus
4537                 # anyway.
4538                 #
4539                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4540                 $insertCats = array_merge( $added, $deleted );
4541                 if ( !$insertCats ) {
4542                         # Okay, nothing to do
4543                         return;
4544                 }
4545
4546                 $insertRows = array();
4547
4548                 foreach ( $insertCats as $cat ) {
4549                         $insertRows[] = array(
4550                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4551                                 'cat_title' => $cat
4552                         );
4553                 }
4554                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4555
4556                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4557                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4558
4559                 if ( $ns == NS_CATEGORY ) {
4560                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4561                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4562                 } elseif ( $ns == NS_FILE ) {
4563                         $addFields[]    = 'cat_files = cat_files + 1';
4564                         $removeFields[] = 'cat_files = cat_files - 1';
4565                 }
4566
4567                 if ( $added ) {
4568                         $dbw->update(
4569                                 'category',
4570                                 $addFields,
4571                                 array( 'cat_title' => $added ),
4572                                 __METHOD__
4573                         );
4574                 }
4575
4576                 if ( $deleted ) {
4577                         $dbw->update(
4578                                 'category',
4579                                 $removeFields,
4580                                 array( 'cat_title' => $deleted ),
4581                                 __METHOD__
4582                         );
4583                 }
4584         }
4585
4586         /**
4587          * Lightweight method to get the parser output for a page, checking the parser cache
4588          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4589          * consider, so it's not appropriate to use there.
4590          *
4591          * @param $oldid mixed integer Revision ID or null
4592          */
4593         public function getParserOutput( $oldid = null ) {
4594                 global $wgEnableParserCache, $wgUser;
4595
4596                 // Should the parser cache be used?
4597                 $useParserCache = $wgEnableParserCache &&
4598                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4599                         $this->exists() &&
4600                         $oldid === null;
4601
4602                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4603
4604                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4605                         wfIncrStats( 'pcache_miss_stub' );
4606                 }
4607
4608                 $parserOutput = false;
4609                 if ( $useParserCache ) {
4610                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4611                 }
4612
4613                 if ( $parserOutput === false ) {
4614                         // Cache miss; parse and output it.
4615                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4616
4617                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4618                 } else {
4619                         return $parserOutput;
4620                 }
4621         }
4622
4623         // Deprecated methods
4624         /**
4625          * Get the database which should be used for reads
4626          *
4627          * @return Database
4628          * @deprecated - just call wfGetDB( DB_MASTER ) instead
4629          */
4630         function getDB() {
4631                 wfDeprecated( __METHOD__ );
4632                 return wfGetDB( DB_MASTER );
4633         }
4634
4635 }