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                 $this->mTitle =& $title;
  55                 $this->mOldId = $oldId;
  56         }
  57
  58         /**
  59          * Constructor from an article article
  60          * @param $id The article ID to load
  61          */
  62         public static function newFromID( $id ) {
  63                 $t = Title::newFromID( $id );
  64                 # FIXME: doesn't inherit right
  65                 return $t == null ? null : new self( $t );
  66                 # return $t == null ? null : new static( $t ); // PHP 5.3
  67         }
  68
  69         /**
  70          * Tell the page view functions that this view was redirected
  71          * from another page on the wiki.
  72          * @param $from Title object.
  73          */
  74         public function setRedirectedFrom( Title $from ) {
  75                 $this->mRedirectedFrom = $from;
  76         }
  77
  78         /**
  79          * If this page is a redirect, get its target
  80          *
  81          * The target will be fetched from the redirect table if possible.
  82          * If this page doesn't have an entry there, call insertRedirect()
  83          * @return mixed Title object, or null if this page is not a redirect
  84          */
  85         public function getRedirectTarget() {
  86                 if ( !$this->mTitle || !$this->mTitle->isRedirect() )
  87                         return null;
  88                 if ( !is_null( $this->mRedirectTarget ) )
  89                         return $this->mRedirectTarget;
  90                 # Query the redirect table
  91                 $dbr = wfGetDB( DB_SLAVE );
  92                 $row = $dbr->selectRow( 'redirect',
  93                         array( 'rd_namespace', 'rd_title' ),
  94                         array( 'rd_from' => $this->getID() ),
  95                         __METHOD__
  96                 );
  97                 if ( $row ) {
  98                         return $this->mRedirectTarget = Title::makeTitle( $row->rd_namespace, $row->rd_title );
  99                 }
 100                 # This page doesn't have an entry in the redirect table
 101                 return $this->mRedirectTarget = $this->insertRedirect();
 102         }
 103
 104         /**
 105          * Insert an entry for this page into the redirect table.
 106          *
 107          * Don't call this function directly unless you know what you're doing.
 108          * @return Title object
 109          */
 110         public function insertRedirect() {
 111                 $retval = Title::newFromRedirect( $this->getContent() );
 112                 if ( !$retval ) {
 113                         return null;
 114                 }
 115                 $dbw = wfGetDB( DB_MASTER );
 116                 $dbw->replace( 'redirect', array( 'rd_from' ),
 117                         array(
 118                                 'rd_from' => $this->getID(),
 119                                 'rd_namespace' => $retval->getNamespace(),
 120                                 'rd_title' => $retval->getDBkey()
 121                         ),
 122                         __METHOD__
 123                 );
 124                 return $retval;
 125         }
 126
 127         /**
 128          * Get the Title object this page redirects to
 129          *
 130          * @return mixed false, Title of in-wiki target, or string with URL
 131          */
 132         public function followRedirect() {
 133                 $text = $this->getContent();
 134                 return $this->followRedirectText( $text );
 135         }
 136
 137         /**
 138          * Get the Title object this text redirects to
 139          *
 140          * @param $text string article content containing redirect info
 141          * @return mixed false, Title of in-wiki target, or string with URL
 142          */
 143         public function followRedirectText( $text ) {
 144                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 145                 # process if title object is valid and not special:userlogout
 146                 if ( $rt ) {
 147                         if ( $rt->getInterwiki() != '' ) {
 148                                 if ( $rt->isLocal() ) {
 149                                         // Offsite wikis need an HTTP redirect.
 150                                         //
 151                                         // This can be hard to reverse and may produce loops,
 152                                         // so they may be disabled in the site configuration.
 153                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 154                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 155                                 }
 156                         } else {
 157                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 158                                         // Gotta handle redirects to special pages differently:
 159                                         // Fill the HTTP response "Location" header and ignore
 160                                         // the rest of the page we're on.
 161                                         //
 162                                         // This can be hard to reverse, so they may be disabled.
 163                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 164                                                 // rolleyes
 165                                         } else {
 166                                                 return $rt->getFullURL();
 167                                         }
 168                                 }
 169                                 return $rt;
 170                         }
 171                 }
 172                 // No or invalid redirect
 173                 return false;
 174         }
 175
 176         /**
 177          * get the title object of the article
 178          * @return Title object of current title
 179          */
 180         public function getTitle() {
 181                 return $this->mTitle;
 182         }
 183
 184         /**
 185          * Clear the object
 186          * @private
 187          */
 188         public function clear() {
 189                 $this->mDataLoaded    = false;
 190                 $this->mContentLoaded = false;
 191
 192                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 193                 $this->mRedirectedFrom = null; # Title object if set
 194                 $this->mRedirectTarget = null; # Title object if set
 195                 $this->mUserText =
 196                 $this->mTimestamp = $this->mComment = '';
 197                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 198                 $this->mTouched = '19700101000000';
 199                 $this->mForUpdate = false;
 200                 $this->mIsRedirect = false;
 201                 $this->mRevIdFetched = 0;
 202                 $this->mRedirectUrl = false;
 203                 $this->mLatest = false;
 204                 $this->mPreparedEdit = false;
 205         }
 206
 207         /**
 208          * Note that getContent/loadContent do not follow redirects anymore.
 209          * If you need to fetch redirectable content easily, try
 210          * the shortcut in Article::followContent()
 211          *
 212          * @return Return the text of this revision
 213          */
 214         public function getContent() {
 215                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 216                 wfProfileIn( __METHOD__ );
 217                 if ( $this->getID() === 0 ) {
 218                         # If this is a MediaWiki:x message, then load the messages
 219                         # and return the message value for x.
 220                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 221                                 # If this is a system message, get the default text.
 222                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 223                                 $wgMessageCache->loadAllMessages( $lang );
 224                                 $text = wfMsgGetKey( $message, false, $lang, false );
 225                                 if ( wfEmptyMsg( $message, $text ) )
 226                                         $text = '';
 227                         } else {
 228                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 229                         }
 230                         wfProfileOut( __METHOD__ );
 231                         return $text;
 232                 } else {
 233                         $this->loadContent();
 234                         wfProfileOut( __METHOD__ );
 235                         return $this->mContent;
 236                 }
 237         }
 238
 239         /**
 240          * Get the text of the current revision. No side-effects...
 241          *
 242          * @return Return the text of the current revision
 243          */
 244         public function getRawText() {
 245                 // Check process cache for current revision
 246                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 247                         return $this->mContent;
 248                 }
 249                 $rev = Revision::newFromTitle( $this->mTitle );
 250                 $text = $rev ? $rev->getRawText() : false;
 251                 return $text;
 252         }
 253
 254         /**
 255          * This function returns the text of a section, specified by a number ($section).
 256          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 257          * the first section before any such heading (section 0).
 258          *
 259          * If a section contains subsections, these are also returned.
 260          *
 261          * @param $text String: text to look in
 262          * @param $section Integer: section number
 263          * @return string text of the requested section
 264          * @deprecated
 265          */
 266         public function getSection( $text, $section ) {
 267                 global $wgParser;
 268                 return $wgParser->getSection( $text, $section );
 269         }
 270
 271         /**
 272          * Get the text that needs to be saved in order to undo all revisions
 273          * between $undo and $undoafter. Revisions must belong to the same page,
 274          * must exist and must not be deleted
 275          * @param $undo Revision
 276          * @param $undoafter Revision Must be an earlier revision than $undo
 277          * @return mixed string on success, false on failure
 278          */
 279         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 280                 $undo_text = $undo->getText();
 281                 $undoafter_text = $undoafter->getText();
 282                 $cur_text = $this->getContent();
 283                 if ( $cur_text == $undo_text ) {
 284                         # No use doing a merge if it's just a straight revert.
 285                         return $undoafter_text;
 286                 }
 287                 $undone_text = '';
 288                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 289                         return false;
 290                 return $undone_text;
 291         }
 292
 293         /**
 294          * @return int The oldid of the article that is to be shown, 0 for the
 295          *             current revision
 296          */
 297         public function getOldID() {
 298                 if ( is_null( $this->mOldId ) ) {
 299                         $this->mOldId = $this->getOldIDFromRequest();
 300                 }
 301                 return $this->mOldId;
 302         }
 303
 304         /**
 305          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 306          *
 307          * @return int The old id for the request
 308          */
 309         public function getOldIDFromRequest() {
 310                 global $wgRequest;
 311                 $this->mRedirectUrl = false;
 312                 $oldid = $wgRequest->getVal( 'oldid' );
 313                 if ( isset( $oldid ) ) {
 314                         $oldid = intval( $oldid );
 315                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 316                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 317                                 if ( $nextid  ) {
 318                                         $oldid = $nextid;
 319                                 } else {
 320                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 321                                 }
 322                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 323                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 324                                 if ( $previd ) {
 325                                         $oldid = $previd;
 326                                 }
 327                         }
 328                 }
 329                 if ( !$oldid ) {
 330                         $oldid = 0;
 331                 }
 332                 return $oldid;
 333         }
 334
 335         /**
 336          * Load the revision (including text) into this object
 337          */
 338         function loadContent() {
 339                 if ( $this->mContentLoaded ) return;
 340                 wfProfileIn( __METHOD__ );
 341                 # Query variables :P
 342                 $oldid = $this->getOldID();
 343                 # Pre-fill content with error message so that if something
 344                 # fails we'll have something telling us what we intended.
 345                 $this->mOldId = $oldid;
 346                 $this->fetchContent( $oldid );
 347                 wfProfileOut( __METHOD__ );
 348         }
 349
 350
 351         /**
 352          * Fetch a page record with the given conditions
 353          * @param $dbr Database object
 354          * @param $conditions Array
 355          * @return mixed Database result resource, or false on failure
 356          */
 357         protected function pageData( $dbr, $conditions ) {
 358                 $fields = array(
 359                                 'page_id',
 360                                 'page_namespace',
 361                                 'page_title',
 362                                 'page_restrictions',
 363                                 'page_counter',
 364                                 'page_is_redirect',
 365                                 'page_is_new',
 366                                 'page_random',
 367                                 'page_touched',
 368                                 'page_latest',
 369                                 'page_len',
 370                 );
 371                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 372                 $row = $dbr->selectRow(
 373                         'page',
 374                         $fields,
 375                         $conditions,
 376                         __METHOD__
 377                 );
 378                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 379                 return $row ;
 380         }
 381
 382         /**
 383          * Fetch a page record matching the Title object's namespace and title
 384          * using a sanitized title string
 385          *
 386          * @param $dbr Database object
 387          * @param $title Title object
 388          * @return mixed Database result resource, or false on failure
 389          */
 390         public function pageDataFromTitle( $dbr, $title ) {
 391                 return $this->pageData( $dbr, array(
 392                         'page_namespace' => $title->getNamespace(),
 393                         'page_title'     => $title->getDBkey() ) );
 394         }
 395
 396         /**
 397          * Fetch a page record matching the requested ID
 398          *
 399          * @param $dbr Database
 400          * @param $id Integer
 401          */
 402         protected function pageDataFromId( $dbr, $id ) {
 403                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 404         }
 405
 406         /**
 407          * Set the general counter, title etc data loaded from
 408          * some source.
 409          *
 410          * @param $data Database row object or "fromdb"
 411          */
 412         public function loadPageData( $data = 'fromdb' ) {
 413                 if ( $data === 'fromdb' ) {
 414                         $dbr = wfGetDB( DB_MASTER );
 415                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 416                 }
 417
 418                 $lc = LinkCache::singleton();
 419                 if ( $data ) {
 420                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 421
 422                         $this->mTitle->mArticleID = intval( $data->page_id );
 423
 424                         # Old-fashioned restrictions
 425                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 426
 427                         $this->mCounter     = intval( $data->page_counter );
 428                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 429                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 430                         $this->mLatest      = intval( $data->page_latest );
 431                 } else {
 432                         if ( is_object( $this->mTitle ) ) {
 433                                 $lc->addBadLinkObj( $this->mTitle );
 434                         }
 435                         $this->mTitle->mArticleID = 0;
 436                 }
 437
 438                 $this->mDataLoaded  = true;
 439         }
 440
 441         /**
 442          * Get text of an article from database
 443          * Does *NOT* follow redirects.
 444          *
 445          * @param $oldid Int: 0 for whatever the latest revision is
 446          * @return mixed string containing article contents, or false if null
 447          */
 448         function fetchContent( $oldid = 0 ) {
 449                 if ( $this->mContentLoaded ) {
 450                         return $this->mContent;
 451                 }
 452
 453                 $dbr = wfGetDB( DB_MASTER );
 454
 455                 # Pre-fill content with error message so that if something
 456                 # fails we'll have something telling us what we intended.
 457                 $t = $this->mTitle->getPrefixedText();
 458                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 459                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 460
 461                 if ( $oldid ) {
 462                         $revision = Revision::newFromId( $oldid );
 463                         if ( is_null( $revision ) ) {
 464                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 465                                 return false;
 466                         }
 467                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 468                         if ( !$data ) {
 469                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 470                                 return false;
 471                         }
 472                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 473                         $this->loadPageData( $data );
 474                 } else {
 475                         if ( !$this->mDataLoaded ) {
 476                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 477                                 if ( !$data ) {
 478                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 479                                         return false;
 480                                 }
 481                                 $this->loadPageData( $data );
 482                         }
 483                         $revision = Revision::newFromId( $this->mLatest );
 484                         if ( is_null( $revision ) ) {
 485                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 486                                 return false;
 487                         }
 488                 }
 489
 490                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 491                 // We should instead work with the Revision object when we need it...
 492                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 493
 494                 $this->mUser      = $revision->getUser();
 495                 $this->mUserText  = $revision->getUserText();
 496                 $this->mComment   = $revision->getComment();
 497                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 498
 499                 $this->mRevIdFetched = $revision->getId();
 500                 $this->mContentLoaded = true;
 501                 $this->mRevision =& $revision;
 502
 503                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 504
 505                 return $this->mContent;
 506         }
 507
 508         /**
 509          * Read/write accessor to select FOR UPDATE
 510          *
 511          * @param $x Mixed: FIXME
 512          * @return mixed value of $x, or value stored in Article::mForUpdate
 513          */
 514         public function forUpdate( $x = null ) {
 515                 return wfSetVar( $this->mForUpdate, $x );
 516         }
 517
 518         /**
 519          * Get the database which should be used for reads
 520          *
 521          * @return Database
 522          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 523          */
 524         function getDB() {
 525                 wfDeprecated( __METHOD__ );
 526                 return wfGetDB( DB_MASTER );
 527         }
 528
 529         /**
 530          * Get options for all SELECT statements
 531          *
 532          * @param $options Array: an optional options array which'll be appended to
 533          *                       the default
 534          * @return Array: options
 535          */
 536         protected function getSelectOptions( $options = '' ) {
 537                 if ( $this->mForUpdate ) {
 538                         if ( is_array( $options ) ) {
 539                                 $options[] = 'FOR UPDATE';
 540                         } else {
 541                                 $options = 'FOR UPDATE';
 542                         }
 543                 }
 544                 return $options;
 545         }
 546
 547         /**
 548          * @return int Page ID
 549          */
 550         public function getID() {
 551                 if ( $this->mTitle ) {
 552                         return $this->mTitle->getArticleID();
 553                 } else {
 554                         return 0;
 555                 }
 556         }
 557
 558         /**
 559          * @return bool Whether or not the page exists in the database
 560          */
 561         public function exists() {
 562                 return $this->getId() > 0;
 563         }
 564
 565         /**
 566          * Check if this page is something we're going to be showing
 567          * some sort of sensible content for. If we return false, page
 568          * views (plain action=view) will return an HTTP 404 response,
 569          * so spiders and robots can know they're following a bad link.
 570          *
 571          * @return bool
 572          */
 573         public function hasViewableContent() {
 574                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 575         }
 576
 577         /**
 578          * @return int The view count for the page
 579          */
 580         public function getCount() {
 581                 if ( -1 == $this->mCounter ) {
 582                         $id = $this->getID();
 583                         if ( $id == 0 ) {
 584                                 $this->mCounter = 0;
 585                         } else {
 586                                 $dbr = wfGetDB( DB_SLAVE );
 587                                 $this->mCounter = $dbr->selectField( 'page',
 588                                         'page_counter',
 589                                         array( 'page_id' => $id ),
 590                                         __METHOD__,
 591                                         $this->getSelectOptions()
 592                                 );
 593                         }
 594                 }
 595                 return $this->mCounter;
 596         }
 597
 598         /**
 599          * Determine whether a page  would be suitable for being counted as an
 600          * article in the site_stats table based on the title & its content
 601          *
 602          * @param $text String: text to analyze
 603          * @return bool
 604          */
 605         public function isCountable( $text ) {
 606                 global $wgUseCommaCount;
 607
 608                 $token = $wgUseCommaCount ? ',' : '[[';
 609                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 610         }
 611
 612         /**
 613          * Tests if the article text represents a redirect
 614          *
 615          * @param $text mixed string containing article contents, or boolean
 616          * @return bool
 617          */
 618         public function isRedirect( $text = false ) {
 619                 if ( $text === false ) {
 620                         if ( $this->mDataLoaded ) {
 621                                 return $this->mIsRedirect;
 622                         }
 623                         // Apparently loadPageData was never called
 624                         $this->loadContent();
 625                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 626                 } else {
 627                         $titleObj = Title::newFromRedirect( $text );
 628                 }
 629                 return $titleObj !== null;
 630         }
 631
 632         /**
 633          * Returns true if the currently-referenced revision is the current edit
 634          * to this page (and it exists).
 635          * @return bool
 636          */
 637         public function isCurrent() {
 638                 # If no oldid, this is the current version.
 639                 if ( $this->getOldID() == 0 ) {
 640                         return true;
 641                 }
 642                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 643         }
 644
 645         /**
 646          * Loads everything except the text
 647          * This isn't necessary for all uses, so it's only done if needed.
 648          */
 649         protected function loadLastEdit() {
 650                 if ( -1 != $this->mUser )
 651                         return;
 652
 653                 # New or non-existent articles have no user information
 654                 $id = $this->getID();
 655                 if ( 0 == $id ) return;
 656
 657                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 658                 if ( !is_null( $this->mLastRevision ) ) {
 659                         $this->mUser      = $this->mLastRevision->getUser();
 660                         $this->mUserText  = $this->mLastRevision->getUserText();
 661                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 662                         $this->mComment   = $this->mLastRevision->getComment();
 663                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 664                         $this->mRevIdFetched = $this->mLastRevision->getId();
 665                 }
 666         }
 667
 668         /**
 669          * @return string GMT timestamp of last article revision
 670          **/
 671
 672         public function getTimestamp() {
 673                 // Check if the field has been filled by ParserCache::get()
 674                 if ( !$this->mTimestamp ) {
 675                         $this->loadLastEdit();
 676                 }
 677                 return wfTimestamp( TS_MW, $this->mTimestamp );
 678         }
 679
 680         /**
 681          * @return int user ID for the user that made the last article revision
 682          */
 683         public function getUser() {
 684                 $this->loadLastEdit();
 685                 return $this->mUser;
 686         }
 687
 688         /**
 689          * @return string username of the user that made the last article revision
 690          */
 691         public function getUserText() {
 692                 $this->loadLastEdit();
 693                 return $this->mUserText;
 694         }
 695
 696         /**
 697          * @return string Comment stored for the last article revision
 698          */
 699         public function getComment() {
 700                 $this->loadLastEdit();
 701                 return $this->mComment;
 702         }
 703
 704         /**
 705          * Returns true if last revision was marked as "minor edit"
 706          *
 707          * @return boolean Minor edit indicator for the last article revision.
 708          */
 709         public function getMinorEdit() {
 710                 $this->loadLastEdit();
 711                 return $this->mMinorEdit;
 712         }
 713
 714         /**
 715          * Use this to fetch the rev ID used on page views
 716          *
 717          * @return int revision ID of last article revision
 718          */
 719         public function getRevIdFetched() {
 720                 $this->loadLastEdit();
 721                 return $this->mRevIdFetched;
 722         }
 723
 724         /**
 725          * @param $limit Integer: default 0.
 726          * @param $offset Integer: default 0.
 727          * @return UserArrayFromResult object with User objects of article contributors for requested range
 728          */
 729         public function getContributors( $limit = 0, $offset = 0 ) {
 730                 # XXX: this is expensive; cache this info somewhere.
 731
 732                 $dbr = wfGetDB( DB_SLAVE );
 733                 $revTable = $dbr->tableName( 'revision' );
 734                 $userTable = $dbr->tableName( 'user' );
 735
 736                 $pageId = $this->getId();
 737
 738                 $user = $this->getUser();
 739                 if ( $user ) {
 740                         $excludeCond = "AND rev_user != $user";
 741                 } else {
 742                         $userText = $dbr->addQuotes( $this->getUserText() );
 743                         $excludeCond = "AND rev_user_text != $userText";
 744                 }
 745
 746                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 747
 748                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 749                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 750                         WHERE rev_page = $pageId
 751                         $excludeCond
 752                         AND $deletedBit = 0
 753                         GROUP BY rev_user, rev_user_text
 754                         ORDER BY timestamp DESC";
 755
 756                 if ( $limit > 0 )
 757                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 758
 759                 $sql .= ' ' . $this->getSelectOptions();
 760                 $res = $dbr->query( $sql, __METHOD__ );
 761
 762                 return new UserArrayFromResult( $res );
 763         }
 764
 765         /**
 766          * This is the default action of the index.php entry point: just view the
 767          * page of the given title.
 768          */
 769         public function view() {
 770                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 771                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 772                 global $wgUseTrackbacks, $wgUseFileCache;
 773
 774                 wfProfileIn( __METHOD__ );
 775
 776                 # Get variables from query string
 777                 $oldid = $this->getOldID();
 778                 $parserCache = ParserCache::singleton();
 779
 780                 $parserOptions = clone $this->getParserOptions();
 781                 # Render printable version, use printable version cache
 782                 if ( $wgOut->isPrintable() ) {
 783                         $parserOptions->setIsPrintable( true );
 784                 }
 785
 786                 # Try client and file cache
 787                 if ( $oldid === 0 && $this->checkTouched() ) {
 788                         global $wgUseETag;
 789                         if ( $wgUseETag ) {
 790                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 791                         }
 792                         # Is is client cached?
 793                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 794                                 wfDebug( __METHOD__ . ": done 304\n" );
 795                                 wfProfileOut( __METHOD__ );
 796                                 return;
 797                         # Try file cache
 798                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 799                                 wfDebug( __METHOD__ . ": done file cache\n" );
 800                                 # tell wgOut that output is taken care of
 801                                 $wgOut->disable();
 802                                 $this->viewUpdates();
 803                                 wfProfileOut( __METHOD__ );
 804                                 return;
 805                         }
 806                 }
 807
 808                 $sk = $wgUser->getSkin();
 809
 810                 # getOldID may want us to redirect somewhere else
 811                 if ( $this->mRedirectUrl ) {
 812                         $wgOut->redirect( $this->mRedirectUrl );
 813                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 814                         wfProfileOut( __METHOD__ );
 815                         return;
 816                 }
 817
 818                 $wgOut->setArticleFlag( true );
 819                 # Set page title (may be overridden by DISPLAYTITLE)
 820                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 821
 822                 # If we got diff in the query, we want to see a diff page instead of the article.
 823                 if ( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 824                         wfDebug( __METHOD__ . ": showing diff page\n" );
 825                         $this->showDiffPage();
 826                         wfProfileOut( __METHOD__ );
 827                         return;
 828                 }
 829
 830                 # Should the parser cache be used?
 831                 $useParserCache = $this->useParserCache( $oldid );
 832                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 833                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 834                         wfIncrStats( 'pcache_miss_stub' );
 835                 }
 836
 837                 # For the main page, overwrite the <title> element with the con-
 838                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 839                 # that's not empty).
 840                 if ( $this->mTitle->equals( Title::newMainPage() )
 841                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
 842                 {
 843                         $wgOut->setHTMLTitle( $m );
 844                 }
 845
 846                 $wasRedirected = $this->showRedirectedFromHeader();
 847                 $this->showNamespaceHeader();
 848
 849                 # Iterate through the possible ways of constructing the output text.
 850                 # Keep going until $outputDone is set, or we run out of things to do.
 851                 $pass = 0;
 852                 $outputDone = false;
 853                 while ( !$outputDone && ++$pass ) {
 854                         switch( $pass ) {
 855                                 case 1:
 856                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 857                                         break;
 858
 859                                 case 2:
 860                                         # Try the parser cache
 861                                         if ( $useParserCache ) {
 862                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 863                                                 if ( $this->mParserOutput !== false ) {
 864                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 865                                                         $wgOut->addParserOutput( $this->mParserOutput );
 866                                                         # Ensure that UI elements requiring revision ID have
 867                                                         # the correct version information.
 868                                                         $wgOut->setRevisionId( $this->mLatest );
 869                                                         $outputDone = true;
 870                                                 }
 871                                         }
 872                                         break;
 873
 874                                 case 3:
 875                                         $text = $this->getContent();
 876                                         if ( $text === false || $this->getID() == 0 ) {
 877                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 878                                                 $this->showMissingArticle();
 879                                                 wfProfileOut( __METHOD__ );
 880                                                 return;
 881                                         }
 882
 883                                         # Another whitelist check in case oldid is altering the title
 884                                         if ( !$this->mTitle->userCanRead() ) {
 885                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 886                                                 $wgOut->loginToUse();
 887                                                 $wgOut->output();
 888                                                 $wgOut->disable();
 889                                                 wfProfileOut( __METHOD__ );
 890                                                 return;
 891                                         }
 892
 893                                         # Are we looking at an old revision
 894                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 895                                                 $this->setOldSubtitle( $oldid );
 896                                                 if ( !$this->showDeletedRevisionHeader() ) {
 897                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 898                                                         wfProfileOut( __METHOD__ );
 899                                                         return;
 900                                                 }
 901                                                 # If this "old" version is the current, then try the parser cache...
 902                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 903                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 904                                                         if ( $this->mParserOutput ) {
 905                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 906                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 907                                                                 $wgOut->setRevisionId( $this->mLatest );
 908                                                                 $this->showViewFooter();
 909                                                                 $this->viewUpdates();
 910                                                                 wfProfileOut( __METHOD__ );
 911                                                                 return;
 912                                                         }
 913                                                 }
 914                                         }
 915
 916                                         # Ensure that UI elements requiring revision ID have
 917                                         # the correct version information.
 918                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 919
 920                                         # Pages containing custom CSS or JavaScript get special treatment
 921                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 922                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 923                                                 $this->showCssOrJsPage();
 924                                                 $outputDone = true;
 925                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 926                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 927                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 928                                                 # Don't append the subtitle if this was an old revision
 929                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 930                                                 # Parse just to get categories, displaytitle, etc.
 931                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 932                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 933                                                 $outputDone = true;
 934                                         }
 935                                         break;
 936
 937                                 case 4:
 938                                         # Run the parse, protected by a pool counter
 939                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 940                                         $key = $parserCache->getKey( $this, $parserOptions );
 941                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 942                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 943                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 944
 945                                         if ( !$status->isOK() ) {
 946                                                 # Connection or timeout error
 947                                                 $this->showPoolError( $status );
 948                                                 wfProfileOut( __METHOD__ );
 949                                                 return;
 950                                         } else {
 951                                                 $outputDone = true;
 952                                         }
 953                                         break;
 954
 955                                 # Should be unreachable, but just in case...
 956                                 default:
 957                                         break 2;
 958                         }
 959                 }
 960
 961                 # Now that we've filled $this->mParserOutput, we know whether
 962                 # there are any __NOINDEX__ tags on the page
 963                 $policy = $this->getRobotPolicy( 'view' );
 964                 $wgOut->setIndexPolicy( $policy['index'] );
 965                 $wgOut->setFollowPolicy( $policy['follow'] );
 966
 967                 $this->showViewFooter();
 968                 $this->viewUpdates();
 969                 wfProfileOut( __METHOD__ );
 970         }
 971
 972         /**
 973          * Show a diff page according to current request variables. For use within
 974          * Article::view() only, other callers should use the DifferenceEngine class.
 975          */
 976         public function showDiffPage() {
 977                 global $wgOut, $wgRequest, $wgUser;
 978
 979                 $diff = $wgRequest->getVal( 'diff' );
 980                 $rcid = $wgRequest->getVal( 'rcid' );
 981                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 982                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 983                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 984                 $oldid = $this->getOldID();
 985
 986                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
 987                 // DifferenceEngine directly fetched the revision:
 988                 $this->mRevIdFetched = $de->mNewid;
 989                 $de->showDiffPage( $diffOnly );
 990
 991                 // Needed to get the page's current revision
 992                 $this->loadPageData();
 993                 if ( $diff == 0 || $diff == $this->mLatest ) {
 994                         # Run view updates for current revision only
 995                         $this->viewUpdates();
 996                 }
 997         }
 998
 999         /**
1000          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1001          * Article::view() only.
1002          *
1003          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1004          * page views.
1005          */
1006         public function showCssOrJsPage() {
1007                 global $wgOut;
1008                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
1009                 // Give hooks a chance to customise the output
1010                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1011                         // Wrap the whole lot in a <pre> and don't parse
1012                         $m = array();
1013                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1014                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1015                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1016                         $wgOut->addHTML( "\n</pre>\n" );
1017                 }
1018         }
1019
1020         /**
1021          * Get the robot policy to be used for the current action=view request.
1022          * @return String the policy that should be set
1023          * @deprecated use getRobotPolicy() instead, which returns an associative
1024          *    array
1025          */
1026         public function getRobotPolicyForView() {
1027                 wfDeprecated( __FUNC__ );
1028                 $policy = $this->getRobotPolicy( 'view' );
1029                 return $policy['index'] . ',' . $policy['follow'];
1030         }
1031
1032         /**
1033          * Get the robot policy to be used for the current view
1034          * @param $action String the action= GET parameter
1035          * @return Array the policy that should be set
1036          * TODO: actions other than 'view'
1037          */
1038         public function getRobotPolicy( $action ) {
1039
1040                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1041                 global $wgDefaultRobotPolicy, $wgRequest;
1042
1043                 $ns = $this->mTitle->getNamespace();
1044                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1045                         # Don't index user and user talk pages for blocked users (bug 11443)
1046                         if ( !$this->mTitle->isSubpage() ) {
1047                                 $block = new Block();
1048                                 if ( $block->load( $this->mTitle->getText() ) ) {
1049                                         return array( 'index'  => 'noindex',
1050                                                       'follow' => 'nofollow' );
1051                                 }
1052                         }
1053                 }
1054
1055                 if ( $this->getID() === 0 || $this->getOldID() ) {
1056                         # Non-articles (special pages etc), and old revisions
1057                         return array( 'index'  => 'noindex',
1058                                       'follow' => 'nofollow' );
1059                 } elseif ( $wgOut->isPrintable() ) {
1060                         # Discourage indexing of printable versions, but encourage following
1061                         return array( 'index'  => 'noindex',
1062                                       'follow' => 'follow' );
1063                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1064                         # For ?curid=x urls, disallow indexing
1065                         return array( 'index'  => 'noindex',
1066                                       'follow' => 'follow' );
1067                 }
1068
1069                 # Otherwise, construct the policy based on the various config variables.
1070                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1071
1072                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1073                         # Honour customised robot policies for this namespace
1074                         $policy = array_merge( $policy,
1075                                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] ) );
1076                 }
1077                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1078                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1079                         # a final sanity check that we have really got the parser output.
1080                         $policy = array_merge( $policy,
1081                                                array( 'index' => $this->mParserOutput->getIndexPolicy() ) );
1082                 }
1083
1084                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1085                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1086                         $policy = array_merge( $policy,
1087                                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) );
1088                 }
1089
1090                 return $policy;
1091
1092         }
1093
1094         /**
1095          * Converts a String robot policy into an associative array, to allow
1096          * merging of several policies using array_merge().
1097          * @param $policy Mixed, returns empty array on null/false/'', transparent
1098          *            to already-converted arrays, converts String.
1099          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1100          */
1101         public static function formatRobotPolicy( $policy ) {
1102                 if ( is_array( $policy ) ) {
1103                         return $policy;
1104                 } elseif ( !$policy ) {
1105                         return array();
1106                 }
1107
1108                 $policy = explode( ',', $policy );
1109                 $policy = array_map( 'trim', $policy );
1110
1111                 $arr = array();
1112                 foreach ( $policy as $var ) {
1113                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1114                                 $arr['index'] = $var;
1115                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1116                                 $arr['follow'] = $var;
1117                         }
1118                 }
1119                 return $arr;
1120         }
1121
1122         /**
1123          * If this request is a redirect view, send "redirected from" subtitle to
1124          * $wgOut. Returns true if the header was needed, false if this is not a
1125          * redirect view. Handles both local and remote redirects.
1126          *
1127          * @return boolean
1128          */
1129         public function showRedirectedFromHeader() {
1130                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1131
1132                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1133                 $sk = $wgUser->getSkin();
1134                 if ( isset( $this->mRedirectedFrom ) ) {
1135                         // This is an internally redirected page view.
1136                         // We'll need a backlink to the source page for navigation.
1137                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1138                                 $redir = $sk->link(
1139                                         $this->mRedirectedFrom,
1140                                         null,
1141                                         array(),
1142                                         array( 'redirect' => 'no' ),
1143                                         array( 'known', 'noclasses' )
1144                                 );
1145                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1146                                 $wgOut->setSubtitle( $s );
1147
1148                                 // Set the fragment if one was specified in the redirect
1149                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1150                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1151                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1152                                 }
1153
1154                                 // Add a <link rel="canonical"> tag
1155                                 $wgOut->addLink( array( 'rel' => 'canonical',
1156                                         'href' => $this->mTitle->getLocalURL() )
1157                                 );
1158                                 return true;
1159                         }
1160                 } elseif ( $rdfrom ) {
1161                         // This is an externally redirected view, from some other wiki.
1162                         // If it was reported from a trusted site, supply a backlink.
1163                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1164                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1165                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1166                                 $wgOut->setSubtitle( $s );
1167                                 return true;
1168                         }
1169                 }
1170                 return false;
1171         }
1172
1173         /**
1174          * Show a header specific to the namespace currently being viewed, like
1175          * [[MediaWiki:Talkpagetext]]. For Article::view().
1176          */
1177         public function showNamespaceHeader() {
1178                 global $wgOut;
1179                 if ( $this->mTitle->isTalkPage() ) {
1180                         $msg = wfMsgNoTrans( 'talkpageheader' );
1181                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1182                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
1183                         }
1184                 }
1185         }
1186
1187         /**
1188          * Show the footer section of an ordinary page view
1189          */
1190         public function showViewFooter() {
1191                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1192                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1193                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1194                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1195                 }
1196
1197                 # If we have been passed an &rcid= parameter, we want to give the user a
1198                 # chance to mark this new article as patrolled.
1199                 $this->showPatrolFooter();
1200
1201                 # Trackbacks
1202                 if ( $wgUseTrackbacks ) {
1203                         $this->addTrackbacks();
1204                 }
1205         }
1206
1207         /**
1208          * If patrol is possible, output a patrol UI box. This is called from the
1209          * footer section of ordinary page views. If patrol is not possible or not
1210          * desired, does nothing.
1211          */
1212         public function showPatrolFooter() {
1213                 global $wgOut, $wgRequest, $wgUser;
1214                 $rcid = $wgRequest->getVal( 'rcid' );
1215
1216                 if ( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1217                         return;
1218                 }
1219
1220                 $sk = $wgUser->getSkin();
1221
1222                 $wgOut->addHTML(
1223                         "<div class='patrollink'>" .
1224                                 wfMsgHtml(
1225                                         'markaspatrolledlink',
1226                                         $sk->link(
1227                                                 $this->mTitle,
1228                                                 wfMsgHtml( 'markaspatrolledtext' ),
1229                                                 array(),
1230                                                 array(
1231                                                         'action' => 'markpatrolled',
1232                                                         'rcid' => $rcid
1233                                                 ),
1234                                                 array( 'known', 'noclasses' )
1235                                         )
1236                                 ) .
1237                         '</div>'
1238                 );
1239         }
1240
1241         /**
1242          * Show the error text for a missing article. For articles in the MediaWiki
1243          * namespace, show the default message text. To be called from Article::view().
1244          */
1245         public function showMissingArticle() {
1246                 global $wgOut, $wgRequest, $wgUser;
1247
1248                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1249                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1250                         $parts = explode( '/', $this->mTitle->getText() );
1251                         $rootPart = $parts[0];
1252                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1253                         $ip = User::isIP( $rootPart );
1254                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1255                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1</div>",
1256                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1257                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1258                                 LogEventsList::showLogExtract(
1259                                         $wgOut,
1260                                         'block',
1261                                         $user->getUserPage()->getPrefixedText(),
1262                                         '',
1263                                         array(
1264                                                 'lim' => 1,
1265                                                 'showIfEmpty' => false,
1266                                                 'msgKey' => array(
1267                                                         'blocked-notice-logextract',
1268                                                         $user->getName() # Support GENDER in notice
1269                                                 )
1270                                         )
1271                                 );
1272                         }
1273                 }
1274                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1275                 # Show delete and move logs
1276                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1277                         array(  'lim' => 10,
1278                                 'conds' => array( "log_action != 'revision'" ),
1279                                 'showIfEmpty' => false,
1280                                 'msgKey' => array( 'moveddeleted-notice' ) )
1281                 );
1282
1283                 # Show error message
1284                 $oldid = $this->getOldID();
1285                 if ( $oldid ) {
1286                         $text = wfMsgNoTrans( 'missing-article',
1287                                 $this->mTitle->getPrefixedText(),
1288                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1289                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1290                         // Use the default message text
1291                         $text = $this->getContent();
1292                 } else {
1293                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1294                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1295                         $errors = array_merge( $createErrors, $editErrors );
1296
1297                         if ( !count( $errors ) )
1298                                 $text = wfMsgNoTrans( 'noarticletext' );
1299                         else
1300                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1301                 }
1302                 $text = "<div class='noarticletext'>\n$text\n</div>";
1303                 if ( !$this->hasViewableContent() ) {
1304                         // If there's no backing content, send a 404 Not Found
1305                         // for better machine handling of broken links.
1306                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1307                 }
1308                 $wgOut->addWikiText( $text );
1309         }
1310
1311         /**
1312          * If the revision requested for view is deleted, check permissions.
1313          * Send either an error message or a warning header to $wgOut.
1314          *
1315          * @return boolean true if the view is allowed, false if not.
1316          */
1317         public function showDeletedRevisionHeader() {
1318                 global $wgOut, $wgRequest;
1319                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1320                         // Not deleted
1321                         return true;
1322                 }
1323                 // If the user is not allowed to see it...
1324                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1325                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1326                                 'rev-deleted-text-permission' );
1327                         return false;
1328                 // If the user needs to confirm that they want to see it...
1329                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1330                         # Give explanation and add a link to view the revision...
1331                         $oldid = intval( $this->getOldID() );
1332                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1333                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1334                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1335                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1336                                 array( $msg, $link ) );
1337                         return false;
1338                 // We are allowed to see...
1339                 } else {
1340                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1341                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1342                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
1343                         return true;
1344                 }
1345         }
1346
1347         /**
1348          * Should the parser cache be used?
1349          *
1350          * @return boolean
1351          */
1352         public function useParserCache( $oldid ) {
1353                 global $wgUser, $wgEnableParserCache;
1354
1355                 return $wgEnableParserCache
1356                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1357                         && $this->exists()
1358                         && empty( $oldid )
1359                         && !$this->mTitle->isCssOrJsPage()
1360                         && !$this->mTitle->isCssJsSubpage();
1361         }
1362
1363         /**
1364          * Execute the uncached parse for action=view
1365          */
1366         public function doViewParse() {
1367                 global $wgOut;
1368                 $oldid = $this->getOldID();
1369                 $useParserCache = $this->useParserCache( $oldid );
1370                 $parserOptions = clone $this->getParserOptions();
1371                 # Render printable version, use printable version cache
1372                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1373                 # Don't show section-edit links on old revisions... this way lies madness.
1374                 $parserOptions->setEditSection( $this->isCurrent() );
1375                 $useParserCache = $this->useParserCache( $oldid );
1376                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1377         }
1378
1379         /**
1380          * Try to fetch an expired entry from the parser cache. If it is present,
1381          * output it and return true. If it is not present, output nothing and
1382          * return false. This is used as a callback function for
1383          * PoolCounter::executeProtected().
1384          *
1385          * @return boolean
1386          */
1387         public function tryDirtyCache() {
1388                 global $wgOut;
1389                 $parserCache = ParserCache::singleton();
1390                 $options = $this->getParserOptions();
1391                 $options->setIsPrintable( $wgOut->isPrintable() );
1392                 $output = $parserCache->getDirty( $this, $options );
1393                 if ( $output ) {
1394                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1395                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1396                         $wgOut->setSquidMaxage( 0 );
1397                         $this->mParserOutput = $output;
1398                         $wgOut->addParserOutput( $output );
1399                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1400                         return true;
1401                 } else {
1402                         wfDebugLog( 'dirty', "dirty missing\n" );
1403                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1404                         return false;
1405                 }
1406         }
1407
1408         /**
1409          * Show an error page for an error from the pool counter.
1410          * @param $status Status
1411          */
1412         public function showPoolError( $status ) {
1413                 global $wgOut;
1414                 $wgOut->clearHTML(); // for release() errors
1415                 $wgOut->enableClientCache( false );
1416                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1417                 $wgOut->addWikiText(
1418                         '<div class="errorbox">' .
1419                         $status->getWikiText( false, 'view-pool-error' ) .
1420                         '</div>'
1421                 );
1422         }
1423
1424         /**
1425          * View redirect
1426          *
1427          * @param $target Title object or Array of destination(s) to redirect
1428          * @param $appendSubtitle Boolean [optional]
1429          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1430          * @return string containing HMTL with redirect link
1431          */
1432         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1433                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1434                 # Display redirect
1435                 if ( !is_array( $target ) ) {
1436                         $target = array( $target );
1437                 }
1438                 $imageDir = $wgContLang->getDir();
1439                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1440                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1441                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1442
1443                 if ( $appendSubtitle ) {
1444                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1445                 }
1446                 $sk = $wgUser->getSkin();
1447                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1448                 $title = array_shift( $target );
1449                 if ( $forceKnown ) {
1450                         $link = $sk->link(
1451                                 $title,
1452                                 htmlspecialchars( $title->getFullText() ),
1453                                 array(),
1454                                 array(),
1455                                 array( 'known', 'noclasses' )
1456                         );
1457                 } else {
1458                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1459                 }
1460                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1461                 foreach ( $target as $rt ) {
1462                         if ( $forceKnown ) {
1463                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1464                                         . $sk->link(
1465                                                 $rt,
1466                                                 htmlspecialchars( $rt->getFullText() ),
1467                                                 array(),
1468                                                 array(),
1469                                                 array( 'known', 'noclasses' )
1470                                         );
1471                         } else {
1472                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1473                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1474                         }
1475                 }
1476                 return '<img src="' . $imageUrl . '" alt="#REDIRECT " />' .
1477                         '<span class="redirectText">' . $link . '</span>';
1478
1479         }
1480
1481         /**
1482          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1483          */
1484         public function addTrackbacks() {
1485                 global $wgOut, $wgUser;
1486                 $dbr = wfGetDB( DB_SLAVE );
1487                 $tbs = $dbr->select( 'trackbacks',
1488                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1489                         array( 'tb_page' => $this->getID() )
1490                 );
1491                 if ( !$dbr->numRows( $tbs ) ) return;
1492
1493                 $tbtext = "";
1494                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1495                         $rmvtxt = "";
1496                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1497                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1498                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1499                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1500                         }
1501                         $tbtext .= "\n";
1502                         $tbtext .= wfMsg( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1503                                         $o->tb_title,
1504                                         $o->tb_url,
1505                                         $o->tb_ex,
1506                                         $o->tb_name,
1507                                         $rmvtxt );
1508                 }
1509                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1510                 $this->mTitle->invalidateCache();
1511         }
1512
1513         /**
1514          * Removes trackback record for current article from trackbacks table
1515          */
1516         public function deletetrackback() {
1517                 global $wgUser, $wgRequest, $wgOut;
1518                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1519                         $wgOut->addWikiMsg( 'sessionfailure' );
1520                         return;
1521                 }
1522
1523                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1524                 if ( count( $permission_errors ) ) {
1525                         $wgOut->showPermissionsErrorPage( $permission_errors );
1526                         return;
1527                 }
1528
1529                 $db = wfGetDB( DB_MASTER );
1530                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1531
1532                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1533                 $this->mTitle->invalidateCache();
1534         }
1535
1536         /**
1537          * Handle action=render
1538          */
1539
1540         public function render() {
1541                 global $wgOut;
1542                 $wgOut->setArticleBodyOnly( true );
1543                 $this->view();
1544         }
1545
1546         /**
1547          * Handle action=purge
1548          */
1549         public function purge() {
1550                 global $wgUser, $wgRequest, $wgOut;
1551                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1552                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1553                                 $this->doPurge();
1554                                 $this->view();
1555                         }
1556                 } else {
1557                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1558                         $button = wfMsgExt( 'confirm_purge_button', array( 'escapenoentities' ) );
1559                         $form = "<form method=\"post\" action=\"$action\">\n" .
1560                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1561                                         "</form>\n";
1562                         $top = wfMsgExt( 'confirm-purge-top', array( 'parse' ) );
1563                         $bottom = wfMsgExt( 'confirm-purge-bottom', array( 'parse' ) );
1564                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1565                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1566                         $wgOut->addHTML( $top . $form . $bottom );
1567                 }
1568         }
1569
1570         /**
1571          * Perform the actions of a page purging
1572          */
1573         public function doPurge() {
1574                 global $wgUseSquid;
1575                 // Invalidate the cache
1576                 $this->mTitle->invalidateCache();
1577
1578                 if ( $wgUseSquid ) {
1579                         // Commit the transaction before the purge is sent
1580                         $dbw = wfGetDB( DB_MASTER );
1581                         $dbw->commit();
1582
1583                         // Send purge
1584                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1585                         $update->doUpdate();
1586                 }
1587                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1588                         global $wgMessageCache;
1589                         if ( $this->getID() == 0 ) {
1590                                 $text = false;
1591                         } else {
1592                                 $text = $this->getRawText();
1593                         }
1594                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1595                 }
1596         }
1597
1598         /**
1599          * Insert a new empty page record for this article.
1600          * This *must* be followed up by creating a revision
1601          * and running $this->updateToLatest( $rev_id );
1602          * or else the record will be left in a funky state.
1603          * Best if all done inside a transaction.
1604          *
1605          * @param $dbw Database
1606          * @return int The newly created page_id key, or false if the title already existed
1607          * @private
1608          */
1609         public function insertOn( $dbw ) {
1610                 wfProfileIn( __METHOD__ );
1611
1612                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1613                 $dbw->insert( 'page', array(
1614                         'page_id'           => $page_id,
1615                         'page_namespace'    => $this->mTitle->getNamespace(),
1616                         'page_title'        => $this->mTitle->getDBkey(),
1617                         'page_counter'      => 0,
1618                         'page_restrictions' => '',
1619                         'page_is_redirect'  => 0, # Will set this shortly...
1620                         'page_is_new'       => 1,
1621                         'page_random'       => wfRandom(),
1622                         'page_touched'      => $dbw->timestamp(),
1623                         'page_latest'       => 0, # Fill this in shortly...
1624                         'page_len'          => 0, # Fill this in shortly...
1625                 ), __METHOD__, 'IGNORE' );
1626
1627                 $affected = $dbw->affectedRows();
1628                 if ( $affected ) {
1629                         $newid = $dbw->insertId();
1630                         $this->mTitle->resetArticleId( $newid );
1631                 }
1632                 wfProfileOut( __METHOD__ );
1633                 return $affected ? $newid : false;
1634         }
1635
1636         /**
1637          * Update the page record to point to a newly saved revision.
1638          *
1639          * @param $dbw Database object
1640          * @param $revision Revision: For ID number, and text used to set
1641                             length and redirect status fields
1642          * @param $lastRevision Integer: if given, will not overwrite the page field
1643          *                      when different from the currently set value.
1644          *                      Giving 0 indicates the new page flag should be set
1645          *                      on.
1646          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1647          *                           removing rows in redirect table.
1648          * @return bool true on success, false on failure
1649          * @private
1650          */
1651         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1652                 wfProfileIn( __METHOD__ );
1653
1654                 $text = $revision->getText();
1655                 $rt = Title::newFromRedirect( $text );
1656
1657                 $conditions = array( 'page_id' => $this->getId() );
1658                 if ( !is_null( $lastRevision ) ) {
1659                         # An extra check against threads stepping on each other
1660                         $conditions['page_latest'] = $lastRevision;
1661                 }
1662
1663                 $dbw->update( 'page',
1664                         array( /* SET */
1665                                 'page_latest'      => $revision->getId(),
1666                                 'page_touched'     => $dbw->timestamp(),
1667                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1668                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1669                                 'page_len'         => strlen( $text ),
1670                         ),
1671                         $conditions,
1672                         __METHOD__ );
1673
1674                 $result = $dbw->affectedRows() != 0;
1675                 if ( $result ) {
1676                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1677                 }
1678
1679                 wfProfileOut( __METHOD__ );
1680                 return $result;
1681         }
1682
1683         /**
1684          * Add row to the redirect table if this is a redirect, remove otherwise.
1685          *
1686          * @param $dbw Database
1687          * @param $redirectTitle a title object pointing to the redirect target,
1688          *                       or NULL if this is not a redirect
1689          * @param $lastRevIsRedirect If given, will optimize adding and
1690          *                           removing rows in redirect table.
1691          * @return bool true on success, false on failure
1692          * @private
1693          */
1694         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1695                 // Always update redirects (target link might have changed)
1696                 // Update/Insert if we don't know if the last revision was a redirect or not
1697                 // Delete if changing from redirect to non-redirect
1698                 $isRedirect = !is_null( $redirectTitle );
1699                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1700                         wfProfileIn( __METHOD__ );
1701                         if ( $isRedirect ) {
1702                                 // This title is a redirect, Add/Update row in the redirect table
1703                                 $set = array( /* SET */
1704                                         'rd_namespace' => $redirectTitle->getNamespace(),
1705                                         'rd_title'     => $redirectTitle->getDBkey(),
1706                                         'rd_from'      => $this->getId(),
1707                                 );
1708                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1709                         } else {
1710                                 // This is not a redirect, remove row from redirect table
1711                                 $where = array( 'rd_from' => $this->getId() );
1712                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1713                         }
1714                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1715                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1716                         }
1717                         wfProfileOut( __METHOD__ );
1718                         return ( $dbw->affectedRows() != 0 );
1719                 }
1720                 return true;
1721         }
1722
1723         /**
1724          * If the given revision is newer than the currently set page_latest,
1725          * update the page record. Otherwise, do nothing.
1726          *
1727          * @param $dbw Database object
1728          * @param $revision Revision object
1729          * @return mixed
1730          */
1731         public function updateIfNewerOn( &$dbw, $revision ) {
1732                 wfProfileIn( __METHOD__ );
1733                 $row = $dbw->selectRow(
1734                         array( 'revision', 'page' ),
1735                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1736                         array(
1737                                 'page_id' => $this->getId(),
1738                                 'page_latest=rev_id' ),
1739                         __METHOD__ );
1740                 if ( $row ) {
1741                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1742                                 wfProfileOut( __METHOD__ );
1743                                 return false;
1744                         }
1745                         $prev = $row->rev_id;
1746                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1747                 } else {
1748                         # No or missing previous revision; mark the page as new
1749                         $prev = 0;
1750                         $lastRevIsRedirect = null;
1751                 }
1752                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1753                 wfProfileOut( __METHOD__ );
1754                 return $ret;
1755         }
1756
1757         /**
1758          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1759          * @return string Complete article text, or null if error
1760          */
1761         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1762                 wfProfileIn( __METHOD__ );
1763                 if ( strval( $section ) == '' ) {
1764                         // Whole-page edit; let the whole text through
1765                 } else {
1766                         if ( is_null( $edittime ) ) {
1767                                 $rev = Revision::newFromTitle( $this->mTitle );
1768                         } else {
1769                                 $dbw = wfGetDB( DB_MASTER );
1770                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1771                         }
1772                         if ( !$rev ) {
1773                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1774                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1775                                 return null;
1776                         }
1777                         $oldtext = $rev->getText();
1778
1779                         if ( $section == 'new' ) {
1780                                 # Inserting a new section
1781                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1782                                 $text = strlen( trim( $oldtext ) ) > 0
1783                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1784                                                 : "{$subject}{$text}";
1785                         } else {
1786                                 # Replacing an existing section; roll out the big guns
1787                                 global $wgParser;
1788                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1789                         }
1790                 }
1791                 wfProfileOut( __METHOD__ );
1792                 return $text;
1793         }
1794
1795         /**
1796          * This function is not deprecated until somebody fixes the core not to use
1797          * it. Nevertheless, use Article::doEdit() instead.
1798          */
1799         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1800                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1801                         ( $isminor ? EDIT_MINOR : 0 ) |
1802                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1803                         ( $bot ? EDIT_FORCE_BOT : 0 );
1804
1805                 # If this is a comment, add the summary as headline
1806                 if ( $comment && $summary != "" ) {
1807                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1808                 }
1809
1810                 $this->doEdit( $text, $summary, $flags );
1811
1812                 $dbw = wfGetDB( DB_MASTER );
1813                 if ( $watchthis ) {
1814                         if ( !$this->mTitle->userIsWatching() ) {
1815                                 $dbw->begin();
1816                                 $this->doWatch();
1817                                 $dbw->commit();
1818                         }
1819                 } else {
1820                         if ( $this->mTitle->userIsWatching() ) {
1821                                 $dbw->begin();
1822                                 $this->doUnwatch();
1823                                 $dbw->commit();
1824                         }
1825                 }
1826                 $this->doRedirect( $this->isRedirect( $text ) );
1827         }
1828
1829         /**
1830          * @deprecated use Article::doEdit()
1831          */
1832         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1833                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1834                         ( $minor ? EDIT_MINOR : 0 ) |
1835                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1836
1837                 $status = $this->doEdit( $text, $summary, $flags );
1838                 if ( !$status->isOK() ) {
1839                         return false;
1840                 }
1841
1842                 $dbw = wfGetDB( DB_MASTER );
1843                 if ( $watchthis ) {
1844                         if ( !$this->mTitle->userIsWatching() ) {
1845                                 $dbw->begin();
1846                                 $this->doWatch();
1847                                 $dbw->commit();
1848                         }
1849                 } else {
1850                         if ( $this->mTitle->userIsWatching() ) {
1851                                 $dbw->begin();
1852                                 $this->doUnwatch();
1853                                 $dbw->commit();
1854                         }
1855                 }
1856
1857                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1858                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1859
1860                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1861                 return true;
1862         }
1863
1864         /**
1865          * Article::doEdit()
1866          *
1867          * Change an existing article or create a new article. Updates RC and all necessary caches,
1868          * optionally via the deferred update array.
1869          *
1870          * $wgUser must be set before calling this function.
1871          *
1872          * @param $text String: new text
1873          * @param $summary String: edit summary
1874          * @param $flags Integer bitfield:
1875          *      EDIT_NEW
1876          *          Article is known or assumed to be non-existent, create a new one
1877          *      EDIT_UPDATE
1878          *          Article is known or assumed to be pre-existing, update it
1879          *      EDIT_MINOR
1880          *          Mark this edit minor, if the user is allowed to do so
1881          *      EDIT_SUPPRESS_RC
1882          *          Do not log the change in recentchanges
1883          *      EDIT_FORCE_BOT
1884          *          Mark the edit a "bot" edit regardless of user rights
1885          *      EDIT_DEFER_UPDATES
1886          *          Defer some of the updates until the end of index.php
1887          *      EDIT_AUTOSUMMARY
1888          *          Fill in blank summaries with generated text where possible
1889          *
1890          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1891          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1892          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1893          * edit-already-exists error will be returned. These two conditions are also possible with
1894          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1895          *
1896          * @param $baseRevId the revision ID this edit was based off, if any
1897          * @param $user Optional user object, $wgUser will be used if not passed
1898          *
1899          * @return Status object. Possible errors:
1900          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1901          *     edit-gone-missing:       In update mode, but the article didn't exist
1902          *     edit-conflict:           In update mode, the article changed unexpectedly
1903          *     edit-no-change:          Warning that the text was the same as before
1904          *     edit-already-exists:     In creation mode, but the article already exists
1905          *
1906          *  Extensions may define additional errors.
1907          *
1908          *  $return->value will contain an associative array with members as follows:
1909          *     new:                     Boolean indicating if the function attempted to create a new article
1910          *     revision:                The revision object for the inserted revision, or null
1911          *
1912          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1913          */
1914         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1915                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1916
1917                 # Low-level sanity check
1918                 if ( $this->mTitle->getText() == '' ) {
1919                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1920                 }
1921
1922                 wfProfileIn( __METHOD__ );
1923
1924                 $user = is_null( $user ) ? $wgUser : $user;
1925                 $status = Status::newGood( array() );
1926
1927                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1928                 $this->loadPageData();
1929
1930                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1931                         $aid = $this->mTitle->getArticleID();
1932                         if ( $aid ) {
1933                                 $flags |= EDIT_UPDATE;
1934                         } else {
1935                                 $flags |= EDIT_NEW;
1936                         }
1937                 }
1938
1939                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1940                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1941                 {
1942                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1943                         wfProfileOut( __METHOD__ );
1944                         if ( $status->isOK() ) {
1945                                 $status->fatal( 'edit-hook-aborted' );
1946                         }
1947                         return $status;
1948                 }
1949
1950                 # Silently ignore EDIT_MINOR if not allowed
1951                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1952                 $bot = $flags & EDIT_FORCE_BOT;
1953
1954                 $oldtext = $this->getRawText(); // current revision
1955                 $oldsize = strlen( $oldtext );
1956
1957                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1958                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1959                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1960                 }
1961
1962                 $editInfo = $this->prepareTextForEdit( $text );
1963                 $text = $editInfo->pst;
1964                 $newsize = strlen( $text );
1965
1966                 $dbw = wfGetDB( DB_MASTER );
1967                 $now = wfTimestampNow();
1968                 $this->mTimestamp = $now;
1969
1970                 if ( $flags & EDIT_UPDATE ) {
1971                         # Update article, but only if changed.
1972                         $status->value['new'] = false;
1973                         # Make sure the revision is either completely inserted or not inserted at all
1974                         if ( !$wgDBtransactions ) {
1975                                 $userAbort = ignore_user_abort( true );
1976                         }
1977
1978                         $revisionId = 0;
1979
1980                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1981
1982                         if ( $changed ) {
1983                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1984                                   - (int)$this->isCountable( $oldtext );
1985                                 $this->mTotalAdjustment = 0;
1986
1987                                 if ( !$this->mLatest ) {
1988                                         # Article gone missing
1989                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1990                                         $status->fatal( 'edit-gone-missing' );
1991                                         wfProfileOut( __METHOD__ );
1992                                         return $status;
1993                                 }
1994
1995                                 $revision = new Revision( array(
1996                                         'page'       => $this->getId(),
1997                                         'comment'    => $summary,
1998                                         'minor_edit' => $isminor,
1999                                         'text'       => $text,
2000                                         'parent_id'  => $this->mLatest,
2001                                         'user'       => $user->getId(),
2002                                         'user_text'  => $user->getName(),
2003                                         ) );
2004
2005                                 $dbw->begin();
2006                                 $revisionId = $revision->insertOn( $dbw );
2007
2008                                 # Update page
2009                                 #
2010                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2011                                 # during the course of this function. This makes sure that EditPage can detect
2012                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2013                                 # before this function is called. A previous function used a separate query, this
2014                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2015                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2016
2017                                 if ( !$ok ) {
2018                                         /* Belated edit conflict! Run away!! */
2019                                         $status->fatal( 'edit-conflict' );
2020                                         # Delete the invalid revision if the DB is not transactional
2021                                         if ( !$wgDBtransactions ) {
2022                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2023                                         }
2024                                         $revisionId = 0;
2025                                         $dbw->rollback();
2026                                 } else {
2027                                         global $wgUseRCPatrol;
2028                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2029                                         # Update recentchanges
2030                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2031                                                 # Mark as patrolled if the user can do so
2032                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2033                                                 # Add RC row to the DB
2034                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2035                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2036                                                         $revisionId, $patrolled
2037                                                 );
2038                                                 # Log auto-patrolled edits
2039                                                 if ( $patrolled ) {
2040                                                         PatrolLog::record( $rc, true );
2041                                                 }
2042                                         }
2043                                         $user->incEditCount();
2044                                         $dbw->commit();
2045                                 }
2046                         } else {
2047                                 $status->warning( 'edit-no-change' );
2048                                 $revision = null;
2049                                 // Keep the same revision ID, but do some updates on it
2050                                 $revisionId = $this->getRevIdFetched();
2051                                 // Update page_touched, this is usually implicit in the page update
2052                                 // Other cache updates are done in onArticleEdit()
2053                                 $this->mTitle->invalidateCache();
2054                         }
2055
2056                         if ( !$wgDBtransactions ) {
2057                                 ignore_user_abort( $userAbort );
2058                         }
2059                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2060                         if ( !$status->isOK() ) {
2061                                 wfProfileOut( __METHOD__ );
2062                                 return $status;
2063                         }
2064
2065                         # Invalidate cache of this article and all pages using this article
2066                         # as a template. Partly deferred.
2067                         Article::onArticleEdit( $this->mTitle );
2068                         # Update links tables, site stats, etc.
2069                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2070                 } else {
2071                         # Create new article
2072                         $status->value['new'] = true;
2073
2074                         # Set statistics members
2075                         # We work out if it's countable after PST to avoid counter drift
2076                         # when articles are created with {{subst:}}
2077                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2078                         $this->mTotalAdjustment = 1;
2079
2080                         $dbw->begin();
2081
2082                         # Add the page record; stake our claim on this title!
2083                         # This will return false if the article already exists
2084                         $newid = $this->insertOn( $dbw );
2085
2086                         if ( $newid === false ) {
2087                                 $dbw->rollback();
2088                                 $status->fatal( 'edit-already-exists' );
2089                                 wfProfileOut( __METHOD__ );
2090                                 return $status;
2091                         }
2092
2093                         # Save the revision text...
2094                         $revision = new Revision( array(
2095                                 'page'       => $newid,
2096                                 'comment'    => $summary,
2097                                 'minor_edit' => $isminor,
2098                                 'text'       => $text,
2099                                 'user'       => $user->getId(),
2100                                 'user_text'  => $user->getName(),
2101                                 ) );
2102                         $revisionId = $revision->insertOn( $dbw );
2103
2104                         $this->mTitle->resetArticleID( $newid );
2105
2106                         # Update the page record with revision data
2107                         $this->updateRevisionOn( $dbw, $revision, 0 );
2108
2109                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2110                         # Update recentchanges
2111                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2112                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2113                                 # Mark as patrolled if the user can do so
2114                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2115                                 # Add RC row to the DB
2116                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2117                                         '', strlen( $text ), $revisionId, $patrolled );
2118                                 # Log auto-patrolled edits
2119                                 if ( $patrolled ) {
2120                                         PatrolLog::record( $rc, true );
2121                                 }
2122                         }
2123                         $user->incEditCount();
2124                         $dbw->commit();
2125
2126                         # Update links, etc.
2127                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2128
2129                         # Clear caches
2130                         Article::onArticleCreate( $this->mTitle );
2131
2132                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2133                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2134                 }
2135
2136                 # Do updates right now unless deferral was requested
2137                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2138                         wfDoUpdates();
2139                 }
2140
2141                 // Return the new revision (or null) to the caller
2142                 $status->value['revision'] = $revision;
2143
2144                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2145                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2146
2147                 wfProfileOut( __METHOD__ );
2148                 return $status;
2149         }
2150
2151         /**
2152          * @deprecated wrapper for doRedirect
2153          */
2154         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2155                 wfDeprecated( __METHOD__ );
2156                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2157         }
2158
2159         /**
2160          * Output a redirect back to the article.
2161          * This is typically used after an edit.
2162          *
2163          * @param $noRedir Boolean: add redirect=no
2164          * @param $sectionAnchor String: section to redirect to, including "#"
2165          * @param $extraQuery String: extra query params
2166          */
2167         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2168                 global $wgOut;
2169                 if ( $noRedir ) {
2170                         $query = 'redirect=no';
2171                         if ( $extraQuery )
2172                                 $query .= "&$query";
2173                 } else {
2174                         $query = $extraQuery;
2175                 }
2176                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2177         }
2178
2179         /**
2180          * Mark this particular edit/page as patrolled
2181          */
2182         public function markpatrolled() {
2183                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2184                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2185
2186                 # If we haven't been given an rc_id value, we can't do anything
2187                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2188                 $rc = RecentChange::newFromId( $rcid );
2189                 if ( is_null( $rc ) ) {
2190                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2191                         return;
2192                 }
2193
2194                 # It would be nice to see where the user had actually come from, but for now just guess
2195                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2196                 $return = SpecialPage::getTitleFor( $returnto );
2197
2198                 $dbw = wfGetDB( DB_MASTER );
2199                 $errors = $rc->doMarkPatrolled();
2200
2201                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2202                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2203                         return;
2204                 }
2205
2206                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2207                         // The hook itself has handled any output
2208                         return;
2209                 }
2210
2211                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2212                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2213                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2214                         $wgOut->returnToMain( false, $return );
2215                         return;
2216                 }
2217
2218                 if ( !empty( $errors ) ) {
2219                         $wgOut->showPermissionsErrorPage( $errors );
2220                         return;
2221                 }
2222
2223                 # Inform the user
2224                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2225                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2226                 $wgOut->returnToMain( false, $return );
2227         }
2228
2229         /**
2230          * User-interface handler for the "watch" action
2231          */
2232         public function watch() {
2233                 global $wgUser, $wgOut;
2234                 if ( $wgUser->isAnon() ) {
2235                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2236                         return;
2237                 }
2238                 if ( wfReadOnly() ) {
2239                         $wgOut->readOnlyPage();
2240                         return;
2241                 }
2242                 if ( $this->doWatch() ) {
2243                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2244                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2245                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2246                 }
2247                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2248         }
2249
2250         /**
2251          * Add this page to $wgUser's watchlist
2252          * @return bool true on successful watch operation
2253          */
2254         public function doWatch() {
2255                 global $wgUser;
2256                 if ( $wgUser->isAnon() ) {
2257                         return false;
2258                 }
2259                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2260                         $wgUser->addWatch( $this->mTitle );
2261                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2262                 }
2263                 return false;
2264         }
2265
2266         /**
2267          * User interface handler for the "unwatch" action.
2268          */
2269         public function unwatch() {
2270                 global $wgUser, $wgOut;
2271                 if ( $wgUser->isAnon() ) {
2272                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2273                         return;
2274                 }
2275                 if ( wfReadOnly() ) {
2276                         $wgOut->readOnlyPage();
2277                         return;
2278                 }
2279                 if ( $this->doUnwatch() ) {
2280                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2281                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2282                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2283                 }
2284                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2285         }
2286
2287         /**
2288          * Stop watching a page
2289          * @return bool true on successful unwatch
2290          */
2291         public function doUnwatch() {
2292                 global $wgUser;
2293                 if ( $wgUser->isAnon() ) {
2294                         return false;
2295                 }
2296                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2297                         $wgUser->removeWatch( $this->mTitle );
2298                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2299                 }
2300                 return false;
2301         }
2302
2303         /**
2304          * action=protect handler
2305          */
2306         public function protect() {
2307                 $form = new ProtectionForm( $this );
2308                 $form->execute();
2309         }
2310
2311         /**
2312          * action=unprotect handler (alias)
2313          */
2314         public function unprotect() {
2315                 $this->protect();
2316         }
2317
2318         /**
2319          * Update the article's restriction field, and leave a log entry.
2320          *
2321          * @param $limit Array: set of restriction keys
2322          * @param $reason String
2323          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2324          * @param $expiry Array: per restriction type expiration
2325          * @return bool true on success
2326          */
2327         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2328                 global $wgUser, $wgContLang;
2329
2330                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2331
2332                 $id = $this->mTitle->getArticleID();
2333                 if ( $id <= 0 ) {
2334                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2335                         return false;
2336                 }
2337
2338                 if ( wfReadOnly() ) {
2339                         wfDebug( "updateRestrictions failed: read-only\n" );
2340                         return false;
2341                 }
2342
2343                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2344                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2345                         return false;
2346                 }
2347
2348                 if ( !$cascade ) {
2349                         $cascade = false;
2350                 }
2351
2352                 // Take this opportunity to purge out expired restrictions
2353                 Title::purgeExpiredRestrictions();
2354
2355                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2356                 # we expect a single selection, but the schema allows otherwise.
2357                 $current = array();
2358                 $updated = Article::flattenRestrictions( $limit );
2359                 $changed = false;
2360                 foreach ( $restrictionTypes as $action ) {
2361                         if ( isset( $expiry[$action] ) ) {
2362                                 # Get current restrictions on $action
2363                                 $aLimits = $this->mTitle->getRestrictions( $action );
2364                                 $current[$action] = implode( '', $aLimits );
2365                                 # Are any actual restrictions being dealt with here?
2366                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2367                                 # If something changed, we need to log it. Checking $aRChanged
2368                                 # assures that "unprotecting" a page that is not protected does
2369                                 # not log just because the expiry was "changed".
2370                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2371                                         $changed = true;
2372                                 }
2373                         }
2374                 }
2375
2376                 $current = Article::flattenRestrictions( $current );
2377
2378                 $changed = ( $changed || $current != $updated );
2379                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2380                 $protect = ( $updated != '' );
2381
2382                 # If nothing's changed, do nothing
2383                 if ( $changed ) {
2384                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2385
2386                                 $dbw = wfGetDB( DB_MASTER );
2387
2388                                 # Prepare a null revision to be added to the history
2389                                 $modified = $current != '' && $protect;
2390                                 if ( $protect ) {
2391                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2392                                 } else {
2393                                         $comment_type = 'unprotectedarticle';
2394                                 }
2395                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2396
2397                                 # Only restrictions with the 'protect' right can cascade...
2398                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2399                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2400                                 # The schema allows multiple restrictions
2401                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) )
2402                                         $cascade = false;
2403                                 $cascade_description = '';
2404                                 if ( $cascade ) {
2405                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2406                                 }
2407
2408                                 if ( $reason )
2409                                         $comment .= ": $reason";
2410
2411                                 $editComment = $comment;
2412                                 $encodedExpiry = array();
2413                                 $protect_description = '';
2414                                 foreach ( $limit as $action => $restrictions  ) {
2415                                         if ( !isset( $expiry[$action] ) )
2416                                                 $expiry[$action] = 'infinite';
2417
2418                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2419                                         if ( $restrictions != '' ) {
2420                                                 $protect_description .= "[$action=$restrictions] (";
2421                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2422                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2423                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2424                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2425                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2426                                                 } else {
2427                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2428                                                 }
2429                                                 $protect_description .= ') ';
2430                                         }
2431                                 }
2432                                 $protect_description = trim( $protect_description );
2433
2434                                 if ( $protect_description && $protect )
2435                                         $editComment .= " ($protect_description)";
2436                                 if ( $cascade )
2437                                         $editComment .= "$cascade_description";
2438                                 # Update restrictions table
2439                                 foreach ( $limit as $action => $restrictions ) {
2440                                         if ( $restrictions != '' ) {
2441                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2442                                                         array( 'pr_page' => $id,
2443                                                                 'pr_type' => $action,
2444                                                                 'pr_level' => $restrictions,
2445                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2446                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2447                                         } else {
2448                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2449                                                         'pr_type' => $action ), __METHOD__ );
2450                                         }
2451                                 }
2452
2453                                 # Insert a null revision
2454                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2455                                 $nullRevId = $nullRevision->insertOn( $dbw );
2456
2457                                 $latest = $this->getLatest();
2458                                 # Update page record
2459                                 $dbw->update( 'page',
2460                                         array( /* SET */
2461                                                 'page_touched' => $dbw->timestamp(),
2462                                                 'page_restrictions' => '',
2463                                                 'page_latest' => $nullRevId
2464                                         ), array( /* WHERE */
2465                                                 'page_id' => $id
2466                                         ), 'Article::protect'
2467                                 );
2468
2469                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2470                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2471
2472                                 # Update the protection log
2473                                 $log = new LogPage( 'protect' );
2474                                 if ( $protect ) {
2475                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2476                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2477                                 } else {
2478                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2479                                 }
2480
2481                         } # End hook
2482                 } # End "changed" check
2483
2484                 return true;
2485         }
2486
2487         /**
2488          * Take an array of page restrictions and flatten it to a string
2489          * suitable for insertion into the page_restrictions field.
2490          * @param $limit Array
2491          * @return String
2492          */
2493         protected static function flattenRestrictions( $limit ) {
2494                 if ( !is_array( $limit ) ) {
2495                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2496                 }
2497                 $bits = array();
2498                 ksort( $limit );
2499                 foreach ( $limit as $action => $restrictions ) {
2500                         if ( $restrictions != '' ) {
2501                                 $bits[] = "$action=$restrictions";
2502                         }
2503                 }
2504                 return implode( ':', $bits );
2505         }
2506
2507         /**
2508          * Auto-generates a deletion reason
2509          *
2510          * @param &$hasHistory Boolean: whether the page has a history
2511          * @return mixed String containing deletion reason or empty string, or boolean false
2512          *    if no revision occurred
2513          */
2514         public function generateReason( &$hasHistory ) {
2515                 global $wgContLang;
2516                 $dbw = wfGetDB( DB_MASTER );
2517                 // Get the last revision
2518                 $rev = Revision::newFromTitle( $this->mTitle );
2519                 if ( is_null( $rev ) )
2520                         return false;
2521
2522                 // Get the article's contents
2523                 $contents = $rev->getText();
2524                 $blank = false;
2525                 // If the page is blank, use the text from the previous revision,
2526                 // which can only be blank if there's a move/import/protect dummy revision involved
2527                 if ( $contents == '' ) {
2528                         $prev = $rev->getPrevious();
2529                         if ( $prev )    {
2530                                 $contents = $prev->getText();
2531                                 $blank = true;
2532                         }
2533                 }
2534
2535                 // Find out if there was only one contributor
2536                 // Only scan the last 20 revisions
2537                 $res = $dbw->select( 'revision', 'rev_user_text',
2538                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2539                         __METHOD__,
2540                         array( 'LIMIT' => 20 )
2541                 );
2542                 if ( $res === false )
2543                         // This page has no revisions, which is very weird
2544                         return false;
2545
2546                 $hasHistory = ( $res->numRows() > 1 );
2547                 $row = $dbw->fetchObject( $res );
2548                 if ( $row ) { // $row is false if the only contributor is hidden
2549                         $onlyAuthor = $row->rev_user_text;
2550                         // Try to find a second contributor
2551                         foreach ( $res as $row ) {
2552                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2553                                         $onlyAuthor = false;
2554                                         break;
2555                                 }
2556                         }
2557                 } else {
2558                         $onlyAuthor = false;
2559                 }
2560                 $dbw->freeResult( $res );
2561
2562                 // Generate the summary with a '$1' placeholder
2563                 if ( $blank ) {
2564                         // The current revision is blank and the one before is also
2565                         // blank. It's just not our lucky day
2566                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2567                 } else {
2568                         if ( $onlyAuthor )
2569                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2570                         else
2571                                 $reason = wfMsgForContent( 'excontent', '$1' );
2572                 }
2573
2574                 if ( $reason == '-' ) {
2575                         // Allow these UI messages to be blanked out cleanly
2576                         return '';
2577                 }
2578
2579                 // Replace newlines with spaces to prevent uglyness
2580                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2581                 // Calculate the maximum amount of chars to get
2582                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2583                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2584                 $contents = $wgContLang->truncate( $contents, $maxLength );
2585                 // Remove possible unfinished links
2586                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2587                 // Now replace the '$1' placeholder
2588                 $reason = str_replace( '$1', $contents, $reason );
2589                 return $reason;
2590         }
2591
2592
2593         /*
2594          * UI entry point for page deletion
2595          */
2596         public function delete() {
2597                 global $wgUser, $wgOut, $wgRequest;
2598
2599                 $confirm = $wgRequest->wasPosted() &&
2600                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2601
2602                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2603                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2604
2605                 $reason = $this->DeleteReasonList;
2606
2607                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2608                         // Entry from drop down menu + additional comment
2609                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2610                 } elseif ( $reason == 'other' ) {
2611                         $reason = $this->DeleteReason;
2612                 }
2613                 # Flag to hide all contents of the archived revisions
2614                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2615
2616                 # This code desperately needs to be totally rewritten
2617
2618                 # Read-only check...
2619                 if ( wfReadOnly() ) {
2620                         $wgOut->readOnlyPage();
2621                         return;
2622                 }
2623
2624                 # Check permissions
2625                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2626
2627                 if ( count( $permission_errors ) > 0 ) {
2628                         $wgOut->showPermissionsErrorPage( $permission_errors );
2629                         return;
2630                 }
2631
2632                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2633
2634                 # Better double-check that it hasn't been deleted yet!
2635                 $dbw = wfGetDB( DB_MASTER );
2636                 $conds = $this->mTitle->pageCond();
2637                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2638                 if ( $latest === false ) {
2639                         $wgOut->showFatalError(
2640                                 Html::rawElement(
2641                                         'div',
2642                                         array( 'class' => 'error mw-error-cannotdelete' ),
2643                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2644                                 )
2645                         );
2646                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2647                         LogEventsList::showLogExtract(
2648                                 $wgOut,
2649                                 'delete',
2650                                 $this->mTitle->getPrefixedText()
2651                         );
2652                         return;
2653                 }
2654
2655                 # Hack for big sites
2656                 $bigHistory = $this->isBigDeletion();
2657                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2658                         global $wgLang, $wgDeleteRevisionsLimit;
2659                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2660                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2661                         return;
2662                 }
2663
2664                 if ( $confirm ) {
2665                         $this->doDelete( $reason, $suppress );
2666                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2667                                 $this->doWatch();
2668                         } elseif ( $this->mTitle->userIsWatching() ) {
2669                                 $this->doUnwatch();
2670                         }
2671                         return;
2672                 }
2673
2674                 // Generate deletion reason
2675                 $hasHistory = false;
2676                 if ( !$reason ) $reason = $this->generateReason( $hasHistory );
2677
2678                 // If the page has a history, insert a warning
2679                 if ( $hasHistory && !$confirm ) {
2680                         global $wgLang;
2681                         $skin = $wgUser->getSkin();
2682                         $revisions = $this->estimateRevisionCount();
2683                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2684                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2685                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2686                                 '</strong>'
2687                         );
2688                         if ( $bigHistory ) {
2689                                 global $wgDeleteRevisionsLimit;
2690                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2691                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2692                         }
2693                 }
2694
2695                 return $this->confirmDelete( $reason );
2696         }
2697
2698         /**
2699          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2700          */
2701         public function isBigDeletion() {
2702                 global $wgDeleteRevisionsLimit;
2703                 if ( $wgDeleteRevisionsLimit ) {
2704                         $revCount = $this->estimateRevisionCount();
2705                         return $revCount > $wgDeleteRevisionsLimit;
2706                 }
2707                 return false;
2708         }
2709
2710         /**
2711          * @return int approximate revision count
2712          */
2713         public function estimateRevisionCount() {
2714                 $dbr = wfGetDB( DB_SLAVE );
2715                 // For an exact count...
2716                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2717                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2718                 return $dbr->estimateRowCount( 'revision', '*',
2719                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2720         }
2721
2722         /**
2723          * Get the last N authors
2724          * @param $num Integer: number of revisions to get
2725          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2726          * @return array Array of authors, duplicates not removed
2727          */
2728         public function getLastNAuthors( $num, $revLatest = 0 ) {
2729                 wfProfileIn( __METHOD__ );
2730                 // First try the slave
2731                 // If that doesn't have the latest revision, try the master
2732                 $continue = 2;
2733                 $db = wfGetDB( DB_SLAVE );
2734                 do {
2735                         $res = $db->select( array( 'page', 'revision' ),
2736                                 array( 'rev_id', 'rev_user_text' ),
2737                                 array(
2738                                         'page_namespace' => $this->mTitle->getNamespace(),
2739                                         'page_title' => $this->mTitle->getDBkey(),
2740                                         'rev_page = page_id'
2741                                 ), __METHOD__, $this->getSelectOptions( array(
2742                                         'ORDER BY' => 'rev_timestamp DESC',
2743                                         'LIMIT' => $num
2744                                 ) )
2745                         );
2746                         if ( !$res ) {
2747                                 wfProfileOut( __METHOD__ );
2748                                 return array();
2749                         }
2750                         $row = $db->fetchObject( $res );
2751                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2752                                 $db = wfGetDB( DB_MASTER );
2753                                 $continue--;
2754                         } else {
2755                                 $continue = 0;
2756                         }
2757                 } while ( $continue );
2758
2759                 $authors = array( $row->rev_user_text );
2760                 while ( $row = $db->fetchObject( $res ) ) {
2761                         $authors[] = $row->rev_user_text;
2762                 }
2763                 wfProfileOut( __METHOD__ );
2764                 return $authors;
2765         }
2766
2767         /**
2768          * Output deletion confirmation dialog
2769          * @param $reason String: prefilled reason
2770          */
2771         public function confirmDelete( $reason ) {
2772                 global $wgOut, $wgUser;
2773
2774                 wfDebug( "Article::confirmDelete\n" );
2775
2776                 $deleteBackLink = $wgUser->getSkin()->link(
2777                         $this->mTitle,
2778                         null,
2779                         array(),
2780                         array(),
2781                         array( 'known', 'noclasses' )
2782                 );
2783                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2784                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2785                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2786
2787                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2788
2789                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
2790                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2791                                         <td></td>
2792                                         <td class='mw-input'><strong>" .
2793                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2794                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2795                                         "</strong></td>
2796                                 </tr>";
2797                 } else {
2798                         $suppress = '';
2799                 }
2800                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2801
2802                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2803                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2804                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2805                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2806                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2807                         "<tr id=\"wpDeleteReasonListRow\">
2808                                 <td class='mw-label'>" .
2809                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2810                                 "</td>
2811                                 <td class='mw-input'>" .
2812                                         Xml::listDropDown( 'wpDeleteReasonList',
2813                                                 wfMsgForContent( 'deletereason-dropdown' ),
2814                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2815                                 "</td>
2816                         </tr>
2817                         <tr id=\"wpDeleteReasonRow\">
2818                                 <td class='mw-label'>" .
2819                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2820                                 "</td>
2821                                 <td class='mw-input'>" .
2822                                 Html::input( 'wpReason', $reason, 'text', array(
2823                                         'size' => '60',
2824                                         'maxlength' => '255',
2825                                         'tabindex' => '2',
2826                                         'id' => 'wpReason',
2827                                         'autofocus'
2828                                 ) ) .
2829                                 "</td>
2830                         </tr>";
2831                 # Dissalow watching is user is not logged in
2832                 if ( $wgUser->isLoggedIn() ) {
2833                         $form .= "
2834                         <tr>
2835                                 <td></td>
2836                                 <td class='mw-input'>" .
2837                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2838                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2839                                 "</td>
2840                         </tr>";
2841                 }
2842                 $form .= "
2843                         $suppress
2844                         <tr>
2845                                 <td></td>
2846                                 <td class='mw-submit'>" .
2847                                         Xml::submitButton( wfMsg( 'deletepage' ),
2848                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2849                                 "</td>
2850                         </tr>" .
2851                         Xml::closeElement( 'table' ) .
2852                         Xml::closeElement( 'fieldset' ) .
2853                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2854                         Xml::closeElement( 'form' );
2855
2856                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2857                                 $skin = $wgUser->getSkin();
2858                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2859                                 $link = $skin->link(
2860                                         $title,
2861                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2862                                         array(),
2863                                         array( 'action' => 'edit' )
2864                                 );
2865                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2866                         }
2867
2868                 $wgOut->addHTML( $form );
2869                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2870                 LogEventsList::showLogExtract(
2871                         $wgOut,
2872                         'delete',
2873                         $this->mTitle->getPrefixedText()
2874                 );
2875         }
2876
2877         /**
2878          * Perform a deletion and output success or failure messages
2879          */
2880         public function doDelete( $reason, $suppress = false ) {
2881                 global $wgOut, $wgUser;
2882                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2883
2884                 $error = '';
2885                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
2886                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2887                                 $deleted = $this->mTitle->getPrefixedText();
2888
2889                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2890                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2891
2892                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2893
2894                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2895                                 $wgOut->returnToMain( false );
2896                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
2897                         }
2898                 } else {
2899                         if ( $error == '' ) {
2900                                 $wgOut->showFatalError(
2901                                         Html::rawElement(
2902                                                 'div',
2903                                                 array( 'class' => 'error mw-error-cannotdelete' ),
2904                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2905                                         )
2906                                 );
2907                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2908                                 LogEventsList::showLogExtract(
2909                                         $wgOut,
2910                                         'delete',
2911                                         $this->mTitle->getPrefixedText()
2912                                 );
2913                         } else {
2914                                 $wgOut->showFatalError( $error );
2915                         }
2916                 }
2917         }
2918
2919         /**
2920          * Back-end article deletion
2921          * Deletes the article with database consistency, writes logs, purges caches
2922          *
2923          * @param $reason string delete reason for deletion log
2924          * @param suppress bitfield
2925          *      Revision::DELETED_TEXT
2926          *      Revision::DELETED_COMMENT
2927          *      Revision::DELETED_USER
2928          *      Revision::DELETED_RESTRICTED
2929          * @param $id int article ID
2930          * @param $commit boolean defaults to true, triggers transaction end
2931          * @return boolean true if successful
2932          */
2933         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
2934                 global $wgUseSquid, $wgDeferredUpdateList;
2935                 global $wgUseTrackbacks;
2936
2937                 wfDebug( __METHOD__ . "\n" );
2938
2939                 $dbw = wfGetDB( DB_MASTER );
2940                 $ns = $this->mTitle->getNamespace();
2941                 $t = $this->mTitle->getDBkey();
2942                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2943
2944                 if ( $t == '' || $id == 0 ) {
2945                         return false;
2946                 }
2947
2948                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
2949                 array_push( $wgDeferredUpdateList, $u );
2950
2951                 // Bitfields to further suppress the content
2952                 if ( $suppress ) {
2953                         $bitfield = 0;
2954                         // This should be 15...
2955                         $bitfield |= Revision::DELETED_TEXT;
2956                         $bitfield |= Revision::DELETED_COMMENT;
2957                         $bitfield |= Revision::DELETED_USER;
2958                         $bitfield |= Revision::DELETED_RESTRICTED;
2959                 } else {
2960                         $bitfield = 'rev_deleted';
2961                 }
2962
2963                 $dbw->begin();
2964                 // For now, shunt the revision data into the archive table.
2965                 // Text is *not* removed from the text table; bulk storage
2966                 // is left intact to avoid breaking block-compression or
2967                 // immutable storage schemes.
2968                 //
2969                 // For backwards compatibility, note that some older archive
2970                 // table entries will have ar_text and ar_flags fields still.
2971                 //
2972                 // In the future, we may keep revisions and mark them with
2973                 // the rev_deleted field, which is reserved for this purpose.
2974                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2975                         array(
2976                                 'ar_namespace'  => 'page_namespace',
2977                                 'ar_title'      => 'page_title',
2978                                 'ar_comment'    => 'rev_comment',
2979                                 'ar_user'       => 'rev_user',
2980                                 'ar_user_text'  => 'rev_user_text',
2981                                 'ar_timestamp'  => 'rev_timestamp',
2982                                 'ar_minor_edit' => 'rev_minor_edit',
2983                                 'ar_rev_id'     => 'rev_id',
2984                                 'ar_text_id'    => 'rev_text_id',
2985                                 'ar_text'       => '\'\'', // Be explicit to appease
2986                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2987                                 'ar_len'        => 'rev_len',
2988                                 'ar_page_id'    => 'page_id',
2989                                 'ar_deleted'    => $bitfield
2990                         ), array(
2991                                 'page_id' => $id,
2992                                 'page_id = rev_page'
2993                         ), __METHOD__
2994                 );
2995
2996                 # Delete restrictions for it
2997                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2998
2999                 # Now that it's safely backed up, delete it
3000                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3001                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3002                 if ( !$ok ) {
3003                         $dbw->rollback();
3004                         return false;
3005                 }
3006
3007                 # Fix category table counts
3008                 $cats = array();
3009                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3010                 foreach ( $res as $row ) {
3011                         $cats [] = $row->cl_to;
3012                 }
3013                 $this->updateCategoryCounts( array(), $cats );
3014
3015                 # If using cascading deletes, we can skip some explicit deletes
3016                 if ( !$dbw->cascadingDeletes() ) {
3017                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3018
3019                         if ( $wgUseTrackbacks )
3020                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3021
3022                         # Delete outgoing links
3023                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3024                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3025                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3026                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3027                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3028                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3029                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3030                 }
3031
3032                 # If using cleanup triggers, we can skip some manual deletes
3033                 if ( !$dbw->cleanupTriggers() ) {
3034                         # Clean up recentchanges entries...
3035                         $dbw->delete( 'recentchanges',
3036                                 array( 'rc_type != ' . RC_LOG,
3037                                         'rc_namespace' => $this->mTitle->getNamespace(),
3038                                         'rc_title' => $this->mTitle->getDBkey() ),
3039                                 __METHOD__ );
3040                         $dbw->delete( 'recentchanges',
3041                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3042                                 __METHOD__ );
3043                 }
3044
3045                 # Clear caches
3046                 Article::onArticleDelete( $this->mTitle );
3047
3048                 # Clear the cached article id so the interface doesn't act like we exist
3049                 $this->mTitle->resetArticleID( 0 );
3050
3051                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3052                 $logtype = $suppress ? 'suppress' : 'delete';
3053                 $log = new LogPage( $logtype );
3054
3055                 # Make sure logging got through
3056                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3057
3058                 if ( $commit ) {
3059                         $dbw->commit();
3060                 }
3061
3062                 return true;
3063         }
3064
3065         /**
3066          * Roll back the most recent consecutive set of edits to a page
3067          * from the same user; fails if there are no eligible edits to
3068          * roll back to, e.g. user is the sole contributor. This function
3069          * performs permissions checks on $wgUser, then calls commitRollback()
3070          * to do the dirty work
3071          *
3072          * @param $fromP String: Name of the user whose edits to rollback.
3073          * @param $summary String: Custom summary. Set to default summary if empty.
3074          * @param $token String: Rollback token.
3075          * @param $bot Boolean: If true, mark all reverted edits as bot.
3076          *
3077          * @param $resultDetails Array: contains result-specific array of additional values
3078          *    'alreadyrolled' : 'current' (rev)
3079          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3080          *
3081          * @return array of errors, each error formatted as
3082          *   array(messagekey, param1, param2, ...).
3083          * On success, the array is empty.  This array can also be passed to
3084          * OutputPage::showPermissionsErrorPage().
3085          */
3086         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3087                 global $wgUser;
3088                 $resultDetails = null;
3089
3090                 # Check permissions
3091                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3092                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3093                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3094
3095                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
3096                         $errors[] = array( 'sessionfailure' );
3097
3098                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3099                         $errors[] = array( 'actionthrottledtext' );
3100                 }
3101                 # If there were errors, bail out now
3102                 if ( !empty( $errors ) )
3103                         return $errors;
3104
3105                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3106         }
3107
3108         /**
3109          * Backend implementation of doRollback(), please refer there for parameter
3110          * and return value documentation
3111          *
3112          * NOTE: This function does NOT check ANY permissions, it just commits the
3113          * rollback to the DB Therefore, you should only call this function direct-
3114          * ly if you want to use custom permissions checks. If you don't, use
3115          * doRollback() instead.
3116          */
3117         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3118                 global $wgUseRCPatrol, $wgUser, $wgLang;
3119                 $dbw = wfGetDB( DB_MASTER );
3120
3121                 if ( wfReadOnly() ) {
3122                         return array( array( 'readonlytext' ) );
3123                 }
3124
3125                 # Get the last editor
3126                 $current = Revision::newFromTitle( $this->mTitle );
3127                 if ( is_null( $current ) ) {
3128                         # Something wrong... no page?
3129                         return array( array( 'notanarticle' ) );
3130                 }
3131
3132                 $from = str_replace( '_', ' ', $fromP );
3133                 # User name given should match up with the top revision.
3134                 # If the user was deleted then $from should be empty.
3135                 if ( $from != $current->getUserText() ) {
3136                         $resultDetails = array( 'current' => $current );
3137                         return array( array( 'alreadyrolled',
3138                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3139                                 htmlspecialchars( $fromP ),
3140                                 htmlspecialchars( $current->getUserText() )
3141                         ) );
3142                 }
3143
3144                 # Get the last edit not by this guy...
3145                 # Note: these may not be public values
3146                 $user = intval( $current->getRawUser() );
3147                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3148                 $s = $dbw->selectRow( 'revision',
3149                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3150                         array( 'rev_page' => $current->getPage(),
3151                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3152                         ), __METHOD__,
3153                         array( 'USE INDEX' => 'page_timestamp',
3154                                 'ORDER BY'  => 'rev_timestamp DESC' )
3155                         );
3156                 if ( $s === false ) {
3157                         # No one else ever edited this page
3158                         return array( array( 'cantrollback' ) );
3159                 } else if ( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3160                         # Only admins can see this text
3161                         return array( array( 'notvisiblerev' ) );
3162                 }
3163
3164                 $set = array();
3165                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3166                         # Mark all reverted edits as bot
3167                         $set['rc_bot'] = 1;
3168                 }
3169                 if ( $wgUseRCPatrol ) {
3170                         # Mark all reverted edits as patrolled
3171                         $set['rc_patrolled'] = 1;
3172                 }
3173
3174                 if ( count( $set ) ) {
3175                         $dbw->update( 'recentchanges', $set,
3176                                 array( /* WHERE */
3177                                         'rc_cur_id' => $current->getPage(),
3178                                         'rc_user_text' => $current->getUserText(),
3179                                         "rc_timestamp > '{$s->rev_timestamp}'",
3180                                 ), __METHOD__
3181                         );
3182                 }
3183
3184                 # Generate the edit summary if necessary
3185                 $target = Revision::newFromId( $s->rev_id );
3186                 if ( empty( $summary ) ) {
3187                         if ( $from == '' ) { // no public user name
3188                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3189                         } else {
3190                                 $summary = wfMsgForContent( 'revertpage' );
3191                         }
3192                 }
3193
3194                 # Allow the custom summary to use the same args as the default message
3195                 $args = array(
3196                         $target->getUserText(), $from, $s->rev_id,
3197                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3198                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3199                 );
3200                 $summary = wfMsgReplaceArgs( $summary, $args );
3201
3202                 # Save
3203                 $flags = EDIT_UPDATE;
3204
3205                 if ( $wgUser->isAllowed( 'minoredit' ) )
3206                         $flags |= EDIT_MINOR;
3207
3208                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) )
3209                         $flags |= EDIT_FORCE_BOT;
3210                 # Actually store the edit
3211                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3212                 if ( !empty( $status->value['revision'] ) ) {
3213                         $revId = $status->value['revision']->getId();
3214                 } else {
3215                         $revId = false;
3216                 }
3217
3218                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3219
3220                 $resultDetails = array(
3221                         'summary' => $summary,
3222                         'current' => $current,
3223                         'target'  => $target,
3224                         'newid'   => $revId
3225                 );
3226                 return array();
3227         }
3228
3229         /**
3230          * User interface for rollback operations
3231          */
3232         public function rollback() {
3233                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3234                 $details = null;
3235
3236                 $result = $this->doRollback(
3237                         $wgRequest->getVal( 'from' ),
3238                         $wgRequest->getText( 'summary' ),
3239                         $wgRequest->getVal( 'token' ),
3240                         $wgRequest->getBool( 'bot' ),
3241                         $details
3242                 );
3243
3244                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3245                         $wgOut->rateLimited();
3246                         return;
3247                 }
3248                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3249                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3250                         $errArray = $result[0];
3251                         $errMsg = array_shift( $errArray );
3252                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3253                         if ( isset( $details['current'] ) ) {
3254                                 $current = $details['current'];
3255                                 if ( $current->getComment() != '' ) {
3256                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3257                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3258                                 }
3259                         }
3260                         return;
3261                 }
3262                 # Display permissions errors before read-only message -- there's no
3263                 # point in misleading the user into thinking the inability to rollback
3264                 # is only temporary.
3265                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3266                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3267                         # move any 'readonlytext' error manually.
3268                         $out = array();
3269                         foreach ( $result as $error ) {
3270                                 if ( $error != array( 'readonlytext' ) ) {
3271                                         $out [] = $error;
3272                                 }
3273                         }
3274                         $wgOut->showPermissionsErrorPage( $out );
3275                         return;
3276                 }
3277                 if ( $result == array( array( 'readonlytext' ) ) ) {
3278                         $wgOut->readOnlyPage();
3279                         return;
3280                 }
3281
3282                 $current = $details['current'];
3283                 $target = $details['target'];
3284                 $newId = $details['newid'];
3285                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3286                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3287                 if ( $current->getUserText() === '' ) {
3288                         $old = wfMsg( 'rev-deleted-user' );
3289                 } else {
3290                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3291                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3292                 }
3293                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3294                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3295                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3296                 $wgOut->returnToMain( false, $this->mTitle );
3297
3298                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3299                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3300                         $de->showDiff( '', '' );
3301                 }
3302         }
3303
3304
3305         /**
3306          * Do standard deferred updates after page view
3307          */
3308         public function viewUpdates() {
3309                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3310                 if ( wfReadOnly() ) {
3311                         return;
3312                 }
3313                 # Don't update page view counters on views from bot users (bug 14044)
3314                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3315                         Article::incViewCount( $this->getID() );
3316                         $u = new SiteStatsUpdate( 1, 0, 0 );
3317                         array_push( $wgDeferredUpdateList, $u );
3318                 }
3319                 # Update newtalk / watchlist notification status
3320                 $wgUser->clearNotification( $this->mTitle );
3321         }
3322
3323         /**
3324          * Prepare text which is about to be saved.
3325          * Returns a stdclass with source, pst and output members
3326          */
3327         public function prepareTextForEdit( $text, $revid = null ) {
3328                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3329                         // Already prepared
3330                         return $this->mPreparedEdit;
3331                 }
3332                 global $wgParser;
3333                 $edit = (object)array();
3334                 $edit->revid = $revid;
3335                 $edit->newText = $text;
3336                 $edit->pst = $this->preSaveTransform( $text );
3337                 $options = $this->getParserOptions();
3338                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3339                 $edit->oldText = $this->getContent();
3340                 $this->mPreparedEdit = $edit;
3341                 return $edit;
3342         }
3343
3344         /**
3345          * Do standard deferred updates after page edit.
3346          * Update links tables, site stats, search index and message cache.
3347          * Purges pages that include this page if the text was changed here.
3348          * Every 100th edit, prune the recent changes table.
3349          *
3350          * @private
3351          * @param $text New text of the article
3352          * @param $summary Edit summary
3353          * @param $minoredit Minor edit
3354          * @param $timestamp_of_pagechange Timestamp associated with the page change
3355          * @param $newid rev_id value of the new revision
3356          * @param $changed Whether or not the content actually changed
3357          */
3358         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3359                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3360
3361                 wfProfileIn( __METHOD__ );
3362
3363                 # Parse the text
3364                 # Be careful not to double-PST: $text is usually already PST-ed once
3365                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3366                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3367                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3368                 } else {
3369                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3370                         $editInfo = $this->mPreparedEdit;
3371                 }
3372
3373                 # Save it to the parser cache
3374                 if ( $wgEnableParserCache ) {
3375                         $popts = $this->getParserOptions();
3376                         $parserCache = ParserCache::singleton();
3377                         $parserCache->save( $editInfo->output, $this, $popts );
3378                 }
3379
3380                 # Update the links tables
3381                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3382                 $u->doUpdate();
3383
3384                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3385
3386                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3387                         if ( 0 == mt_rand( 0, 99 ) ) {
3388                                 // Flush old entries from the `recentchanges` table; we do this on
3389                                 // random requests so as to avoid an increase in writes for no good reason
3390                                 global $wgRCMaxAge;
3391                                 $dbw = wfGetDB( DB_MASTER );
3392                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3393                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3394                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3395                                 $dbw->query( $sql );
3396                         }
3397                 }
3398
3399                 $id = $this->getID();
3400                 $title = $this->mTitle->getPrefixedDBkey();
3401                 $shortTitle = $this->mTitle->getDBkey();
3402
3403                 if ( 0 == $id ) {
3404                         wfProfileOut( __METHOD__ );
3405                         return;
3406                 }
3407
3408                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3409                 array_push( $wgDeferredUpdateList, $u );
3410                 $u = new SearchUpdate( $id, $title, $text );
3411                 array_push( $wgDeferredUpdateList, $u );
3412
3413                 # If this is another user's talk page, update newtalk
3414                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3415                 # load of user talk pages and piss people off, nor if it's a minor edit
3416                 # by a properly-flagged bot.
3417                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3418                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3419                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3420                                 $other = User::newFromName( $shortTitle, false );
3421                                 if ( !$other ) {
3422                                         wfDebug( __METHOD__ . ": invalid username\n" );
3423                                 } elseif ( User::isIP( $shortTitle ) ) {
3424                                         // An anonymous user
3425                                         $other->setNewtalk( true );
3426                                 } elseif ( $other->isLoggedIn() ) {
3427                                         $other->setNewtalk( true );
3428                                 } else {
3429                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3430                                 }
3431                         }
3432                 }
3433
3434                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3435                         $wgMessageCache->replace( $shortTitle, $text );
3436                 }
3437
3438                 wfProfileOut( __METHOD__ );
3439         }
3440
3441         /**
3442          * Perform article updates on a special page creation.
3443          *
3444          * @param $rev Revision object
3445          *
3446          * @todo This is a shitty interface function. Kill it and replace the
3447          * other shitty functions like editUpdates and such so it's not needed
3448          * anymore.
3449          */
3450         public function createUpdates( $rev ) {
3451                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3452                 $this->mTotalAdjustment = 1;
3453                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3454                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3455         }
3456
3457         /**
3458          * Generate the navigation links when browsing through an article revisions
3459          * It shows the information as:
3460          *   Revision as of \<date\>; view current revision
3461          *   \<- Previous version | Next Version -\>
3462          *
3463          * @param $oldid String: revision ID of this article revision
3464          */
3465         public function setOldSubtitle( $oldid = 0 ) {
3466                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3467
3468                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3469                         return;
3470                 }
3471
3472                 $unhide = $wgRequest->getInt( 'unhide' ) == 1 &&
3473                         $wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $oldid );
3474                 # Cascade unhide param in links for easy deletion browsing
3475                 $extraParams = array();
3476                 if ( $wgRequest->getVal( 'unhide' ) ) {
3477                         $extraParams['unhide'] = 1;
3478                 }
3479                 $revision = Revision::newFromId( $oldid );
3480
3481                 $current = ( $oldid == $this->mLatest );
3482                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3483                 $tddate = $wgLang->date( $this->mTimestamp, true );
3484                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3485                 $sk = $wgUser->getSkin();
3486                 $lnk = $current
3487                         ? wfMsgHtml( 'currentrevisionlink' )
3488                         : $sk->link(
3489                                 $this->mTitle,
3490                                 wfMsgHtml( 'currentrevisionlink' ),
3491                                 array(),
3492                                 $extraParams,
3493                                 array( 'known', 'noclasses' )
3494                         );
3495                 $curdiff = $current
3496                         ? wfMsgHtml( 'diff' )
3497                         : $sk->link(
3498                                 $this->mTitle,
3499                                 wfMsgHtml( 'diff' ),
3500                                 array(),
3501                                 array(
3502                                         'diff' => 'cur',
3503                                         'oldid' => $oldid
3504                                 ) + $extraParams,
3505                                 array( 'known', 'noclasses' )
3506                         );
3507                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3508                 $prevlink = $prev
3509                         ? $sk->link(
3510                                 $this->mTitle,
3511                                 wfMsgHtml( 'previousrevision' ),
3512                                 array(),
3513                                 array(
3514                                         'direction' => 'prev',
3515                                         'oldid' => $oldid
3516                                 ) + $extraParams,
3517                                 array( 'known', 'noclasses' )
3518                         )
3519                         : wfMsgHtml( 'previousrevision' );
3520                 $prevdiff = $prev
3521                         ? $sk->link(
3522                                 $this->mTitle,
3523                                 wfMsgHtml( 'diff' ),
3524                                 array(),
3525                                 array(
3526                                         'diff' => 'prev',
3527                                         'oldid' => $oldid
3528                                 ) + $extraParams,
3529                                 array( 'known', 'noclasses' )
3530                         )
3531                         : wfMsgHtml( 'diff' );
3532                 $nextlink = $current
3533                         ? wfMsgHtml( 'nextrevision' )
3534                         : $sk->link(
3535                                 $this->mTitle,
3536                                 wfMsgHtml( 'nextrevision' ),
3537                                 array(),
3538                                 array(
3539                                         'direction' => 'next',
3540                                         'oldid' => $oldid
3541                                 ) + $extraParams,
3542                                 array( 'known', 'noclasses' )
3543                         );
3544                 $nextdiff = $current
3545                         ? wfMsgHtml( 'diff' )
3546                         : $sk->link(
3547                                 $this->mTitle,
3548                                 wfMsgHtml( 'diff' ),
3549                                 array(),
3550                                 array(
3551                                         'diff' => 'next',
3552                                         'oldid' => $oldid
3553                                 ) + $extraParams,
3554                                 array( 'known', 'noclasses' )
3555                         );
3556
3557                 $cdel = '';
3558                 // User can delete revisions or view deleted revisions...
3559                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3560                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3561                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3562                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3563                         } else {
3564                                 $query = array(
3565                                         'type'   => 'revision',
3566                                         'target' => $this->mTitle->getPrefixedDbkey(),
3567                                         'ids'    => $oldid
3568                                 );
3569                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3570                         }
3571                         $cdel .= ' ';
3572                 }
3573
3574                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3575                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3576
3577                 $m = wfMsg( 'revision-info-current' );
3578                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3579                         ? 'revision-info-current'
3580                         : 'revision-info';
3581
3582                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3583                         wfMsgExt(
3584                                 $infomsg,
3585                                 array( 'parseinline', 'replaceafter' ),
3586                                 $td,
3587                                 $userlinks,
3588                                 $revision->getID(),
3589                                 $tddate,
3590                                 $tdtime,
3591                                 $revision->getUser()
3592                         ) .
3593                         "</div>\n" .
3594                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3595                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3596                 $wgOut->setSubtitle( $r );
3597         }
3598
3599         /**
3600          * This function is called right before saving the wikitext,
3601          * so we can do things like signatures and links-in-context.
3602          *
3603          * @param $text String article contents
3604          * @return string article contents with altered wikitext markup (signatures
3605          *      converted, {{subst:}}, templates, etc.)
3606          */
3607         public function preSaveTransform( $text ) {
3608                 global $wgParser, $wgUser;
3609                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3610         }
3611
3612         /* Caching functions */
3613
3614         /**
3615          * checkLastModified returns true if it has taken care of all
3616          * output to the client that is necessary for this request.
3617          * (that is, it has sent a cached version of the page)
3618          *
3619          * @return boolean true if cached version send, false otherwise
3620          */
3621         protected function tryFileCache() {
3622                 static $called = false;
3623                 if ( $called ) {
3624                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3625                         return false;
3626                 }
3627                 $called = true;
3628                 if ( $this->isFileCacheable() ) {
3629                         $cache = new HTMLFileCache( $this->mTitle );
3630                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3631                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3632                                 $cache->loadFromFileCache();
3633                                 return true;
3634                         } else {
3635                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3636                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3637                         }
3638                 } else {
3639                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3640                 }
3641                 return false;
3642         }
3643
3644         /**
3645          * Check if the page can be cached
3646          * @return bool
3647          */
3648         public function isFileCacheable() {
3649                 $cacheable = false;
3650                 if ( HTMLFileCache::useFileCache() ) {
3651                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3652                         // Extension may have reason to disable file caching on some pages.
3653                         if ( $cacheable ) {
3654                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3655                         }
3656                 }
3657                 return $cacheable;
3658         }
3659
3660         /**
3661          * Loads page_touched and returns a value indicating if it should be used
3662          * @return boolean true if not a redirect
3663          */
3664         public function checkTouched() {
3665                 if ( !$this->mDataLoaded ) {
3666                         $this->loadPageData();
3667                 }
3668                 return !$this->mIsRedirect;
3669         }
3670
3671         /**
3672          * Get the page_touched field
3673          * @return string containing GMT timestamp
3674          */
3675         public function getTouched() {
3676                 # Ensure that page data has been loaded
3677                 if ( !$this->mDataLoaded ) {
3678                         $this->loadPageData();
3679                 }
3680                 return $this->mTouched;
3681         }
3682
3683         /**
3684          * Get the page_latest field
3685          * @return integer rev_id of current revision
3686          */
3687         public function getLatest() {
3688                 if ( !$this->mDataLoaded ) {
3689                         $this->loadPageData();
3690                 }
3691                 return (int)$this->mLatest;
3692         }
3693
3694         /**
3695          * Edit an article without doing all that other stuff
3696          * The article must already exist; link tables etc
3697          * are not updated, caches are not flushed.
3698          *
3699          * @param $text String: text submitted
3700          * @param $comment String: comment submitted
3701          * @param $minor Boolean: whereas it's a minor modification
3702          */
3703         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3704                 wfProfileIn( __METHOD__ );
3705
3706                 $dbw = wfGetDB( DB_MASTER );
3707                 $revision = new Revision( array(
3708                         'page'       => $this->getId(),
3709                         'text'       => $text,
3710                         'comment'    => $comment,
3711                         'minor_edit' => $minor ? 1 : 0,
3712                         ) );
3713                 $revision->insertOn( $dbw );
3714                 $this->updateRevisionOn( $dbw, $revision );
3715
3716                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3717
3718                 wfProfileOut( __METHOD__ );
3719         }
3720
3721         /**
3722          * Used to increment the view counter
3723          *
3724          * @param $id Integer: article id
3725          */
3726         public static function incViewCount( $id ) {
3727                 $id = intval( $id );
3728                 global $wgHitcounterUpdateFreq;
3729
3730                 $dbw = wfGetDB( DB_MASTER );
3731                 $pageTable = $dbw->tableName( 'page' );
3732                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3733                 $acchitsTable = $dbw->tableName( 'acchits' );
3734
3735                 if ( $wgHitcounterUpdateFreq <= 1 ) {
3736                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3737                         return;
3738                 }
3739
3740                 # Not important enough to warrant an error page in case of failure
3741                 $oldignore = $dbw->ignoreErrors( true );
3742
3743                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3744
3745                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
3746                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
3747                         # Most of the time (or on SQL errors), skip row count check
3748                         $dbw->ignoreErrors( $oldignore );
3749                         return;
3750                 }
3751
3752                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
3753                 $row = $dbw->fetchObject( $res );
3754                 $rown = intval( $row->n );
3755                 if ( $rown >= $wgHitcounterUpdateFreq ) {
3756                         wfProfileIn( 'Article::incViewCount-collect' );
3757                         $old_user_abort = ignore_user_abort( true );
3758
3759                         $dbType = $dbw->getType();
3760                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
3761                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
3762                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
3763                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
3764                                 'GROUP BY hc_id', __METHOD__ );
3765                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
3766                         $dbw->unlockTables( __METHOD__ );
3767                         if ( $dbType == 'mysql' ) {
3768                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
3769                                         'WHERE page_id = hc_id', __METHOD__ );
3770                         }
3771                         else {
3772                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
3773                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
3774                         }
3775                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
3776
3777                         ignore_user_abort( $old_user_abort );
3778                         wfProfileOut( 'Article::incViewCount-collect' );
3779                 }
3780                 $dbw->ignoreErrors( $oldignore );
3781         }
3782
3783         /**#@+
3784          * The onArticle*() functions are supposed to be a kind of hooks
3785          * which should be called whenever any of the specified actions
3786          * are done.
3787          *
3788          * This is a good place to put code to clear caches, for instance.
3789          *
3790          * This is called on page move and undelete, as well as edit
3791          *
3792          * @param $title a title object
3793          */
3794         public static function onArticleCreate( $title ) {
3795                 # Update existence markers on article/talk tabs...
3796                 if ( $title->isTalkPage() ) {
3797                         $other = $title->getSubjectPage();
3798                 } else {
3799                         $other = $title->getTalkPage();
3800                 }
3801                 $other->invalidateCache();
3802                 $other->purgeSquid();
3803
3804                 $title->touchLinks();
3805                 $title->purgeSquid();
3806                 $title->deleteTitleProtection();
3807         }
3808
3809         /**
3810          * Clears caches when article is deleted
3811          */
3812         public static function onArticleDelete( $title ) {
3813                 global $wgMessageCache;
3814                 # Update existence markers on article/talk tabs...
3815                 if ( $title->isTalkPage() ) {
3816                         $other = $title->getSubjectPage();
3817                 } else {
3818                         $other = $title->getTalkPage();
3819                 }
3820                 $other->invalidateCache();
3821                 $other->purgeSquid();
3822
3823                 $title->touchLinks();
3824                 $title->purgeSquid();
3825
3826                 # File cache
3827                 HTMLFileCache::clearFileCache( $title );
3828
3829                 # Messages
3830                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3831                         $wgMessageCache->replace( $title->getDBkey(), false );
3832                 }
3833                 # Images
3834                 if ( $title->getNamespace() == NS_FILE ) {
3835                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3836                         $update->doUpdate();
3837                 }
3838                 # User talk pages
3839                 if ( $title->getNamespace() == NS_USER_TALK ) {
3840                         $user = User::newFromName( $title->getText(), false );
3841                         $user->setNewtalk( false );
3842                 }
3843                 # Image redirects
3844                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3845         }
3846
3847         /**
3848          * Purge caches on page update etc
3849          *
3850          * @param $title Title object
3851          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3852          */
3853         public static function onArticleEdit( $title ) {
3854                 global $wgDeferredUpdateList;
3855
3856                 // Invalidate caches of articles which include this page
3857                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3858
3859                 // Invalidate the caches of all pages which redirect here
3860                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3861
3862                 # Purge squid for this page only
3863                 $title->purgeSquid();
3864
3865                 # Clear file cache for this page only
3866                 HTMLFileCache::clearFileCache( $title );
3867         }
3868
3869         /**#@-*/
3870
3871         /**
3872          * Overriden by ImagePage class, only present here to avoid a fatal error
3873          * Called for ?action=revert
3874          */
3875         public function revert() {
3876                 global $wgOut;
3877                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3878         }
3879
3880         /**
3881          * Info about this page
3882          * Called for ?action=info when $wgAllowPageInfo is on.
3883          */
3884         public function info() {
3885                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3886
3887                 if ( !$wgAllowPageInfo ) {
3888                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3889                         return;
3890                 }
3891
3892                 $page = $this->mTitle->getSubjectPage();
3893
3894                 $wgOut->setPagetitle( $page->getPrefixedText() );
3895                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3896                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3897
3898                 if ( !$this->mTitle->exists() ) {
3899                         $wgOut->addHTML( '<div class="noarticletext">' );
3900                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3901                                 // This doesn't quite make sense; the user is asking for
3902                                 // information about the _page_, not the message... -- RC
3903                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3904                         } else {
3905                                 $msg = $wgUser->isLoggedIn()
3906                                         ? 'noarticletext'
3907                                         : 'noarticletextanon';
3908                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3909                         }
3910                         $wgOut->addHTML( '</div>' );
3911                 } else {
3912                         $dbr = wfGetDB( DB_SLAVE );
3913                         $wl_clause = array(
3914                                 'wl_title'     => $page->getDBkey(),
3915                                 'wl_namespace' => $page->getNamespace() );
3916                         $numwatchers = $dbr->selectField(
3917                                 'watchlist',
3918                                 'COUNT(*)',
3919                                 $wl_clause,
3920                                 __METHOD__,
3921                                 $this->getSelectOptions() );
3922
3923                         $pageInfo = $this->pageCountInfo( $page );
3924                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3925
3926                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3927                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
3928                         if ( $talkInfo ) {
3929                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
3930                         }
3931                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3932                         if ( $talkInfo ) {
3933                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3934                         }
3935                         $wgOut->addHTML( '</ul>' );
3936                 }
3937         }
3938
3939         /**
3940          * Return the total number of edits and number of unique editors
3941          * on a given page. If page does not exist, returns false.
3942          *
3943          * @param $title Title object
3944          * @return mixed array or boolean false
3945          */
3946         public function pageCountInfo( $title ) {
3947                 $id = $title->getArticleId();
3948                 if ( $id == 0 ) {
3949                         return false;
3950                 }
3951                 $dbr = wfGetDB( DB_SLAVE );
3952                 $rev_clause = array( 'rev_page' => $id );
3953                 $edits = $dbr->selectField(
3954                         'revision',
3955                         'COUNT(rev_page)',
3956                         $rev_clause,
3957                         __METHOD__,
3958                         $this->getSelectOptions()
3959                 );
3960                 $authors = $dbr->selectField(
3961                         'revision',
3962                         'COUNT(DISTINCT rev_user_text)',
3963                         $rev_clause,
3964                         __METHOD__,
3965                         $this->getSelectOptions()
3966                 );
3967                 return array( 'edits' => $edits, 'authors' => $authors );
3968         }
3969
3970         /**
3971          * Return a list of templates used by this article.
3972          * Uses the templatelinks table
3973          *
3974          * @return Array of Title objects
3975          */
3976         public function getUsedTemplates() {
3977                 $result = array();
3978                 $id = $this->mTitle->getArticleID();
3979                 if ( $id == 0 ) {
3980                         return array();
3981                 }
3982                 $dbr = wfGetDB( DB_SLAVE );
3983                 $res = $dbr->select( array( 'templatelinks' ),
3984                         array( 'tl_namespace', 'tl_title' ),
3985                         array( 'tl_from' => $id ),
3986                         __METHOD__ );
3987                 if ( $res !== false ) {
3988                         foreach ( $res as $row ) {
3989                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3990                         }
3991                 }
3992                 $dbr->freeResult( $res );
3993                 return $result;
3994         }
3995
3996         /**
3997          * Returns a list of hidden categories this page is a member of.
3998          * Uses the page_props and categorylinks tables.
3999          *
4000          * @return Array of Title objects
4001          */
4002         public function getHiddenCategories() {
4003                 $result = array();
4004                 $id = $this->mTitle->getArticleID();
4005                 if ( $id == 0 ) {
4006                         return array();
4007                 }
4008                 $dbr = wfGetDB( DB_SLAVE );
4009                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4010                         array( 'cl_to' ),
4011                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4012                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4013                         __METHOD__ );
4014                 if ( $res !== false ) {
4015                         foreach ( $res as $row ) {
4016                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4017                         }
4018                 }
4019                 $dbr->freeResult( $res );
4020                 return $result;
4021         }
4022
4023         /**
4024         * Return an applicable autosummary if one exists for the given edit.
4025         * @param $oldtext String: the previous text of the page.
4026         * @param $newtext String: The submitted text of the page.
4027         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4028         * @return string An appropriate autosummary, or an empty string.
4029         */
4030         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4031                 # Decide what kind of autosummary is needed.
4032
4033                 # Redirect autosummaries
4034                 $ot = Title::newFromRedirect( $oldtext );
4035                 $rt = Title::newFromRedirect( $newtext );
4036                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4037                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4038                 }
4039
4040                 # New page autosummaries
4041                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4042                         # If they're making a new article, give its text, truncated, in the summary.
4043                         global $wgContLang;
4044                         $truncatedtext = $wgContLang->truncate(
4045                                 str_replace( "\n", ' ', $newtext ),
4046                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4047                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4048                 }
4049
4050                 # Blanking autosummaries
4051                 if ( $oldtext != '' && $newtext == '' ) {
4052                         return wfMsgForContent( 'autosumm-blank' );
4053                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4054                         # Removing more than 90% of the article
4055                         global $wgContLang;
4056                         $truncatedtext = $wgContLang->truncate(
4057                                 $newtext,
4058                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4059                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4060                 }
4061
4062                 # If we reach this point, there's no applicable autosummary for our case, so our
4063                 # autosummary is empty.
4064                 return '';
4065         }
4066
4067         /**
4068          * Add the primary page-view wikitext to the output buffer
4069          * Saves the text into the parser cache if possible.
4070          * Updates templatelinks if it is out of date.
4071          *
4072          * @param $text String
4073          * @param $cache Boolean
4074          * @param $parserOptions mixed ParserOptions object, or boolean false
4075          */
4076         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4077                 global $wgOut;
4078
4079                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4080                 $wgOut->addParserOutput( $this->mParserOutput );
4081         }
4082
4083         /**
4084          * This does all the heavy lifting for outputWikitext, except it returns the parser
4085          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4086          * say, embedding thread pages within a discussion system (LiquidThreads)
4087          *
4088          * @param $text string
4089          * @param $cache boolean
4090          * @param $parserOptions parsing options, defaults to false
4091          * @return string containing parsed output
4092          */
4093         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4094                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
4095
4096                 if ( !$parserOptions ) {
4097                         $parserOptions = $this->getParserOptions();
4098                 }
4099
4100                 $time = - wfTime();
4101                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4102                         $parserOptions, true, true, $this->getRevIdFetched() );
4103                 $time += wfTime();
4104
4105                 # Timing hack
4106                 if ( $time > 3 ) {
4107                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4108                                 $this->mTitle->getPrefixedDBkey() ) );
4109                 }
4110
4111                 if ( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
4112                         $parserCache = ParserCache::singleton();
4113                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4114                 }
4115                 // Make sure file cache is not used on uncacheable content.
4116                 // Output that has magic words in it can still use the parser cache
4117                 // (if enabled), though it will generally expire sooner.
4118                 if ( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
4119                         $wgUseFileCache = false;
4120                 }
4121                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4122                 return $this->mParserOutput;
4123         }
4124
4125         /**
4126          * Get parser options suitable for rendering the primary article wikitext
4127          * @return mixed ParserOptions object or boolean false
4128          */
4129         public function getParserOptions() {
4130                 global $wgUser;
4131                 if ( !$this->mParserOptions ) {
4132                         $this->mParserOptions = new ParserOptions( $wgUser );
4133                         $this->mParserOptions->setTidy( true );
4134                         $this->mParserOptions->enableLimitReport();
4135                 }
4136                 return $this->mParserOptions;
4137         }
4138
4139         /**
4140          * Updates cascading protections
4141          *
4142          * @param $parserOutput mixed ParserOptions object, or boolean false
4143          **/
4144
4145         protected function doCascadeProtectionUpdates( $parserOutput ) {
4146                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4147                         return;
4148                 }
4149
4150                 // templatelinks table may have become out of sync,
4151                 // especially if using variable-based transclusions.
4152                 // For paranoia, check if things have changed and if
4153                 // so apply updates to the database. This will ensure
4154                 // that cascaded protections apply as soon as the changes
4155                 // are visible.
4156
4157                 # Get templates from templatelinks
4158                 $id = $this->mTitle->getArticleID();
4159
4160                 $tlTemplates = array();
4161
4162                 $dbr = wfGetDB( DB_SLAVE );
4163                 $res = $dbr->select( array( 'templatelinks' ),
4164                         array( 'tl_namespace', 'tl_title' ),
4165                         array( 'tl_from' => $id ),
4166                         __METHOD__ );
4167
4168                 global $wgContLang;
4169                 foreach ( $res as $row ) {
4170                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4171                 }
4172
4173                 # Get templates from parser output.
4174                 $poTemplates = array();
4175                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4176                         foreach ( $templates as $dbk => $id ) {
4177                                 $poTemplates["$ns:$dbk"] = true;
4178                         }
4179                 }
4180
4181                 # Get the diff
4182                 # Note that we simulate array_diff_key in PHP <5.0.x
4183                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4184
4185                 if ( count( $templates_diff ) > 0 ) {
4186                         # Whee, link updates time.
4187                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4188                         $u->doUpdate();
4189                 }
4190         }
4191
4192         /**
4193          * Update all the appropriate counts in the category table, given that
4194          * we've added the categories $added and deleted the categories $deleted.
4195          *
4196          * @param $added array   The names of categories that were added
4197          * @param $deleted array The names of categories that were deleted
4198          */
4199         public function updateCategoryCounts( $added, $deleted ) {
4200                 $ns = $this->mTitle->getNamespace();
4201                 $dbw = wfGetDB( DB_MASTER );
4202
4203                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4204                 # exist, we might legitimately not create it, but it's simpler to just
4205                 # create it and then give it a negative value, since the value is bogus
4206                 # anyway.
4207                 #
4208                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4209                 $insertCats = array_merge( $added, $deleted );
4210                 if ( !$insertCats ) {
4211                         # Okay, nothing to do
4212                         return;
4213                 }
4214                 $insertRows = array();
4215                 foreach ( $insertCats as $cat ) {
4216                         $insertRows[] = array(
4217                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4218                                 'cat_title' => $cat
4219                         );
4220                 }
4221                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4222
4223                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4224                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4225                 if ( $ns == NS_CATEGORY ) {
4226                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4227                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4228                 } elseif ( $ns == NS_FILE ) {
4229                         $addFields[]    = 'cat_files = cat_files + 1';
4230                         $removeFields[] = 'cat_files = cat_files - 1';
4231                 }
4232
4233                 if ( $added ) {
4234                         $dbw->update(
4235                                 'category',
4236                                 $addFields,
4237                                 array( 'cat_title' => $added ),
4238                                 __METHOD__
4239                         );
4240                 }
4241                 if ( $deleted ) {
4242                         $dbw->update(
4243                                 'category',
4244                                 $removeFields,
4245                                 array( 'cat_title' => $deleted ),
4246                                 __METHOD__
4247                         );
4248                 }
4249         }
4250
4251         /**
4252          * Lightweight method to get the parser output for a page, checking the parser cache
4253          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4254          * consider, so it's not appropriate to use there.
4255          *
4256          * @param $oldid mixed integer Revision ID or null
4257          */
4258         public function getParserOutput( $oldid = null ) {
4259                 global $wgEnableParserCache, $wgUser, $wgOut;
4260
4261                 // Should the parser cache be used?
4262                 $useParserCache = $wgEnableParserCache &&
4263                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4264                           $this->exists() &&
4265                           $oldid === null;
4266
4267                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4268                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4269                         wfIncrStats( 'pcache_miss_stub' );
4270                 }
4271
4272                 $parserOutput = false;
4273                 if ( $useParserCache ) {
4274                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4275                 }
4276
4277                 if ( $parserOutput === false ) {
4278                         // Cache miss; parse and output it.
4279                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4280
4281                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4282                 } else {
4283                         return $parserOutput;
4284                 }
4285         }
4286 }