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                 # getOldID may want us to redirect somewhere else
 809                 if ( $this->mRedirectUrl ) {
 810                         $wgOut->redirect( $this->mRedirectUrl );
 811                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 812                         wfProfileOut( __METHOD__ );
 813                         return;
 814                 }
 815
 816                 $wgOut->setArticleFlag( true );
 817                 # Set page title (may be overridden by DISPLAYTITLE)
 818                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 819
 820                 # If we got diff in the query, we want to see a diff page instead of the article.
 821                 if ( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 822                         wfDebug( __METHOD__ . ": showing diff page\n" );
 823                         $this->showDiffPage();
 824                         wfProfileOut( __METHOD__ );
 825                         return;
 826                 }
 827
 828                 # Should the parser cache be used?
 829                 $useParserCache = $this->useParserCache( $oldid );
 830                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 831                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 832                         wfIncrStats( 'pcache_miss_stub' );
 833                 }
 834
 835                 # For the main page, overwrite the <title> element with the con-
 836                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 837                 # that's not empty).
 838                 if ( $this->mTitle->equals( Title::newMainPage() )
 839                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
 840                 {
 841                         $wgOut->setHTMLTitle( $m );
 842                 }
 843
 844                 $wasRedirected = $this->showRedirectedFromHeader();
 845                 $this->showNamespaceHeader();
 846
 847                 # Iterate through the possible ways of constructing the output text.
 848                 # Keep going until $outputDone is set, or we run out of things to do.
 849                 $pass = 0;
 850                 $outputDone = false;
 851                 while ( !$outputDone && ++$pass ) {
 852                         switch( $pass ) {
 853                                 case 1:
 854                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 855                                         break;
 856
 857                                 case 2:
 858                                         # Try the parser cache
 859                                         if ( $useParserCache ) {
 860                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 861                                                 if ( $this->mParserOutput !== false ) {
 862                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 863                                                         $wgOut->addParserOutput( $this->mParserOutput );
 864                                                         # Ensure that UI elements requiring revision ID have
 865                                                         # the correct version information.
 866                                                         $wgOut->setRevisionId( $this->mLatest );
 867                                                         $outputDone = true;
 868                                                 }
 869                                         }
 870                                         break;
 871
 872                                 case 3:
 873                                         $text = $this->getContent();
 874                                         if ( $text === false || $this->getID() == 0 ) {
 875                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 876                                                 $this->showMissingArticle();
 877                                                 wfProfileOut( __METHOD__ );
 878                                                 return;
 879                                         }
 880
 881                                         # Another whitelist check in case oldid is altering the title
 882                                         if ( !$this->mTitle->userCanRead() ) {
 883                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 884                                                 $wgOut->loginToUse();
 885                                                 $wgOut->output();
 886                                                 $wgOut->disable();
 887                                                 wfProfileOut( __METHOD__ );
 888                                                 return;
 889                                         }
 890
 891                                         # Are we looking at an old revision
 892                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 893                                                 $this->setOldSubtitle( $oldid );
 894                                                 if ( !$this->showDeletedRevisionHeader() ) {
 895                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 896                                                         wfProfileOut( __METHOD__ );
 897                                                         return;
 898                                                 }
 899                                                 # If this "old" version is the current, then try the parser cache...
 900                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 901                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 902                                                         if ( $this->mParserOutput ) {
 903                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 904                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 905                                                                 $wgOut->setRevisionId( $this->mLatest );
 906                                                                 $this->showViewFooter();
 907                                                                 $this->viewUpdates();
 908                                                                 wfProfileOut( __METHOD__ );
 909                                                                 return;
 910                                                         }
 911                                                 }
 912                                         }
 913
 914                                         # Ensure that UI elements requiring revision ID have
 915                                         # the correct version information.
 916                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 917
 918                                         # Pages containing custom CSS or JavaScript get special treatment
 919                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 920                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 921                                                 $this->showCssOrJsPage();
 922                                                 $outputDone = true;
 923                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 924                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 925                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 926                                                 # Don't append the subtitle if this was an old revision
 927                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 928                                                 # Parse just to get categories, displaytitle, etc.
 929                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 930                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 931                                                 $outputDone = true;
 932                                         }
 933                                         break;
 934
 935                                 case 4:
 936                                         # Run the parse, protected by a pool counter
 937                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 938                                         $key = $parserCache->getKey( $this, $parserOptions );
 939                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 940                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 941                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 942
 943                                         if ( !$status->isOK() ) {
 944                                                 # Connection or timeout error
 945                                                 $this->showPoolError( $status );
 946                                                 wfProfileOut( __METHOD__ );
 947                                                 return;
 948                                         } else {
 949                                                 $outputDone = true;
 950                                         }
 951                                         break;
 952
 953                                 # Should be unreachable, but just in case...
 954                                 default:
 955                                         break 2;
 956                         }
 957                 }
 958
 959                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 960                 $titleText = $this->mParserOutput->getTitleText();
 961                 if ( strval( $titleText ) !== '' ) {
 962                         $wgOut->setPageTitle( $titleText );
 963                 }
 964
 965                 # Now that we've filled $this->mParserOutput, we know whether
 966                 # there are any __NOINDEX__ tags on the page
 967                 $policy = $this->getRobotPolicy( 'view' );
 968                 $wgOut->setIndexPolicy( $policy['index'] );
 969                 $wgOut->setFollowPolicy( $policy['follow'] );
 970
 971                 $this->showViewFooter();
 972                 $this->viewUpdates();
 973                 wfProfileOut( __METHOD__ );
 974         }
 975
 976         /**
 977          * Show a diff page according to current request variables. For use within
 978          * Article::view() only, other callers should use the DifferenceEngine class.
 979          */
 980         public function showDiffPage() {
 981                 global $wgOut, $wgRequest, $wgUser;
 982
 983                 $diff = $wgRequest->getVal( 'diff' );
 984                 $rcid = $wgRequest->getVal( 'rcid' );
 985                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 986                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 987                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 988                 $oldid = $this->getOldID();
 989
 990                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
 991                 // DifferenceEngine directly fetched the revision:
 992                 $this->mRevIdFetched = $de->mNewid;
 993                 $de->showDiffPage( $diffOnly );
 994
 995                 // Needed to get the page's current revision
 996                 $this->loadPageData();
 997                 if ( $diff == 0 || $diff == $this->mLatest ) {
 998                         # Run view updates for current revision only
 999                         $this->viewUpdates();
1000                 }
1001         }
1002
1003         /**
1004          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1005          * Article::view() only.
1006          *
1007          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1008          * page views.
1009          */
1010         public function showCssOrJsPage() {
1011                 global $wgOut;
1012                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
1013                 // Give hooks a chance to customise the output
1014                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1015                         // Wrap the whole lot in a <pre> and don't parse
1016                         $m = array();
1017                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1018                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1019                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1020                         $wgOut->addHTML( "\n</pre>\n" );
1021                 }
1022         }
1023
1024         /**
1025          * Get the robot policy to be used for the current action=view request.
1026          * @return String the policy that should be set
1027          * @deprecated use getRobotPolicy() instead, which returns an associative
1028          *    array
1029          */
1030         public function getRobotPolicyForView() {
1031                 wfDeprecated( __METHOD__ );
1032                 $policy = $this->getRobotPolicy( 'view' );
1033                 return $policy['index'] . ',' . $policy['follow'];
1034         }
1035
1036         /**
1037          * Get the robot policy to be used for the current view
1038          * @param $action String the action= GET parameter
1039          * @return Array the policy that should be set
1040          * TODO: actions other than 'view'
1041          */
1042         public function getRobotPolicy( $action ) {
1043
1044                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1045                 global $wgDefaultRobotPolicy, $wgRequest;
1046
1047                 $ns = $this->mTitle->getNamespace();
1048                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1049                         # Don't index user and user talk pages for blocked users (bug 11443)
1050                         if ( !$this->mTitle->isSubpage() ) {
1051                                 $block = new Block();
1052                                 if ( $block->load( $this->mTitle->getText() ) ) {
1053                                         return array( 'index'  => 'noindex',
1054                                                       'follow' => 'nofollow' );
1055                                 }
1056                         }
1057                 }
1058
1059                 if ( $this->getID() === 0 || $this->getOldID() ) {
1060                         # Non-articles (special pages etc), and old revisions
1061                         return array( 'index'  => 'noindex',
1062                                       'follow' => 'nofollow' );
1063                 } elseif ( $wgOut->isPrintable() ) {
1064                         # Discourage indexing of printable versions, but encourage following
1065                         return array( 'index'  => 'noindex',
1066                                       'follow' => 'follow' );
1067                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1068                         # For ?curid=x urls, disallow indexing
1069                         return array( 'index'  => 'noindex',
1070                                       'follow' => 'follow' );
1071                 }
1072
1073                 # Otherwise, construct the policy based on the various config variables.
1074                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1075
1076                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1077                         # Honour customised robot policies for this namespace
1078                         $policy = array_merge( $policy,
1079                                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] ) );
1080                 }
1081                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1082                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1083                         # a final sanity check that we have really got the parser output.
1084                         $policy = array_merge( $policy,
1085                                                array( 'index' => $this->mParserOutput->getIndexPolicy() ) );
1086                 }
1087
1088                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1089                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1090                         $policy = array_merge( $policy,
1091                                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) );
1092                 }
1093
1094                 return $policy;
1095
1096         }
1097
1098         /**
1099          * Converts a String robot policy into an associative array, to allow
1100          * merging of several policies using array_merge().
1101          * @param $policy Mixed, returns empty array on null/false/'', transparent
1102          *            to already-converted arrays, converts String.
1103          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1104          */
1105         public static function formatRobotPolicy( $policy ) {
1106                 if ( is_array( $policy ) ) {
1107                         return $policy;
1108                 } elseif ( !$policy ) {
1109                         return array();
1110                 }
1111
1112                 $policy = explode( ',', $policy );
1113                 $policy = array_map( 'trim', $policy );
1114
1115                 $arr = array();
1116                 foreach ( $policy as $var ) {
1117                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1118                                 $arr['index'] = $var;
1119                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1120                                 $arr['follow'] = $var;
1121                         }
1122                 }
1123                 return $arr;
1124         }
1125
1126         /**
1127          * If this request is a redirect view, send "redirected from" subtitle to
1128          * $wgOut. Returns true if the header was needed, false if this is not a
1129          * redirect view. Handles both local and remote redirects.
1130          *
1131          * @return boolean
1132          */
1133         public function showRedirectedFromHeader() {
1134                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1135
1136                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1137                 $sk = $wgUser->getSkin();
1138                 if ( isset( $this->mRedirectedFrom ) ) {
1139                         // This is an internally redirected page view.
1140                         // We'll need a backlink to the source page for navigation.
1141                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1142                                 $redir = $sk->link(
1143                                         $this->mRedirectedFrom,
1144                                         null,
1145                                         array(),
1146                                         array( 'redirect' => 'no' ),
1147                                         array( 'known', 'noclasses' )
1148                                 );
1149                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1150                                 $wgOut->setSubtitle( $s );
1151
1152                                 // Set the fragment if one was specified in the redirect
1153                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1154                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1155                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1156                                 }
1157
1158                                 // Add a <link rel="canonical"> tag
1159                                 $wgOut->addLink( array( 'rel' => 'canonical',
1160                                         'href' => $this->mTitle->getLocalURL() )
1161                                 );
1162                                 return true;
1163                         }
1164                 } elseif ( $rdfrom ) {
1165                         // This is an externally redirected view, from some other wiki.
1166                         // If it was reported from a trusted site, supply a backlink.
1167                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1168                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1169                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1170                                 $wgOut->setSubtitle( $s );
1171                                 return true;
1172                         }
1173                 }
1174                 return false;
1175         }
1176
1177         /**
1178          * Show a header specific to the namespace currently being viewed, like
1179          * [[MediaWiki:Talkpagetext]]. For Article::view().
1180          */
1181         public function showNamespaceHeader() {
1182                 global $wgOut;
1183                 if ( $this->mTitle->isTalkPage() ) {
1184                         $msg = wfMsgNoTrans( 'talkpageheader' );
1185                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1186                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
1187                         }
1188                 }
1189         }
1190
1191         /**
1192          * Show the footer section of an ordinary page view
1193          */
1194         public function showViewFooter() {
1195                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1196                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1197                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1198                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1199                 }
1200
1201                 # If we have been passed an &rcid= parameter, we want to give the user a
1202                 # chance to mark this new article as patrolled.
1203                 $this->showPatrolFooter();
1204
1205                 # Trackbacks
1206                 if ( $wgUseTrackbacks ) {
1207                         $this->addTrackbacks();
1208                 }
1209         }
1210
1211         /**
1212          * If patrol is possible, output a patrol UI box. This is called from the
1213          * footer section of ordinary page views. If patrol is not possible or not
1214          * desired, does nothing.
1215          */
1216         public function showPatrolFooter() {
1217                 global $wgOut, $wgRequest, $wgUser;
1218                 $rcid = $wgRequest->getVal( 'rcid' );
1219
1220                 if ( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1221                         return;
1222                 }
1223
1224                 $sk = $wgUser->getSkin();
1225
1226                 $wgOut->addHTML(
1227                         "<div class='patrollink'>" .
1228                                 wfMsgHtml(
1229                                         'markaspatrolledlink',
1230                                         $sk->link(
1231                                                 $this->mTitle,
1232                                                 wfMsgHtml( 'markaspatrolledtext' ),
1233                                                 array(),
1234                                                 array(
1235                                                         'action' => 'markpatrolled',
1236                                                         'rcid' => $rcid
1237                                                 ),
1238                                                 array( 'known', 'noclasses' )
1239                                         )
1240                                 ) .
1241                         '</div>'
1242                 );
1243         }
1244
1245         /**
1246          * Show the error text for a missing article. For articles in the MediaWiki
1247          * namespace, show the default message text. To be called from Article::view().
1248          */
1249         public function showMissingArticle() {
1250                 global $wgOut, $wgRequest, $wgUser;
1251
1252                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1253                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1254                         $parts = explode( '/', $this->mTitle->getText() );
1255                         $rootPart = $parts[0];
1256                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1257                         $ip = User::isIP( $rootPart );
1258                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1259                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1</div>",
1260                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1261                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1262                                 LogEventsList::showLogExtract(
1263                                         $wgOut,
1264                                         'block',
1265                                         $user->getUserPage()->getPrefixedText(),
1266                                         '',
1267                                         array(
1268                                                 'lim' => 1,
1269                                                 'showIfEmpty' => false,
1270                                                 'msgKey' => array(
1271                                                         'blocked-notice-logextract',
1272                                                         $user->getName() # Support GENDER in notice
1273                                                 )
1274                                         )
1275                                 );
1276                         }
1277                 }
1278                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1279                 # Show delete and move logs
1280                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1281                         array(  'lim' => 10,
1282                                 'conds' => array( "log_action != 'revision'" ),
1283                                 'showIfEmpty' => false,
1284                                 'msgKey' => array( 'moveddeleted-notice' ) )
1285                 );
1286
1287                 # Show error message
1288                 $oldid = $this->getOldID();
1289                 if ( $oldid ) {
1290                         $text = wfMsgNoTrans( 'missing-article',
1291                                 $this->mTitle->getPrefixedText(),
1292                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1293                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1294                         // Use the default message text
1295                         $text = $this->getContent();
1296                 } else {
1297                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1298                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1299                         $errors = array_merge( $createErrors, $editErrors );
1300
1301                         if ( !count( $errors ) )
1302                                 $text = wfMsgNoTrans( 'noarticletext' );
1303                         else
1304                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1305                 }
1306                 $text = "<div class='noarticletext'>\n$text\n</div>";
1307                 if ( !$this->hasViewableContent() ) {
1308                         // If there's no backing content, send a 404 Not Found
1309                         // for better machine handling of broken links.
1310                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1311                 }
1312                 $wgOut->addWikiText( $text );
1313         }
1314
1315         /**
1316          * If the revision requested for view is deleted, check permissions.
1317          * Send either an error message or a warning header to $wgOut.
1318          *
1319          * @return boolean true if the view is allowed, false if not.
1320          */
1321         public function showDeletedRevisionHeader() {
1322                 global $wgOut, $wgRequest;
1323                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1324                         // Not deleted
1325                         return true;
1326                 }
1327                 // If the user is not allowed to see it...
1328                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1329                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1330                                 'rev-deleted-text-permission' );
1331                         return false;
1332                 // If the user needs to confirm that they want to see it...
1333                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1334                         # Give explanation and add a link to view the revision...
1335                         $oldid = intval( $this->getOldID() );
1336                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1337                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1338                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1339                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1340                                 array( $msg, $link ) );
1341                         return false;
1342                 // We are allowed to see...
1343                 } else {
1344                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1345                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1346                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
1347                         return true;
1348                 }
1349         }
1350
1351         /**
1352          * Should the parser cache be used?
1353          *
1354          * @return boolean
1355          */
1356         public function useParserCache( $oldid ) {
1357                 global $wgUser, $wgEnableParserCache;
1358
1359                 return $wgEnableParserCache
1360                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1361                         && $this->exists()
1362                         && empty( $oldid )
1363                         && !$this->mTitle->isCssOrJsPage()
1364                         && !$this->mTitle->isCssJsSubpage();
1365         }
1366
1367         /**
1368          * Execute the uncached parse for action=view
1369          */
1370         public function doViewParse() {
1371                 global $wgOut;
1372                 $oldid = $this->getOldID();
1373                 $useParserCache = $this->useParserCache( $oldid );
1374                 $parserOptions = clone $this->getParserOptions();
1375                 # Render printable version, use printable version cache
1376                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1377                 # Don't show section-edit links on old revisions... this way lies madness.
1378                 $parserOptions->setEditSection( $this->isCurrent() );
1379                 $useParserCache = $this->useParserCache( $oldid );
1380                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1381         }
1382
1383         /**
1384          * Try to fetch an expired entry from the parser cache. If it is present,
1385          * output it and return true. If it is not present, output nothing and
1386          * return false. This is used as a callback function for
1387          * PoolCounter::executeProtected().
1388          *
1389          * @return boolean
1390          */
1391         public function tryDirtyCache() {
1392                 global $wgOut;
1393                 $parserCache = ParserCache::singleton();
1394                 $options = $this->getParserOptions();
1395                 $options->setIsPrintable( $wgOut->isPrintable() );
1396                 $output = $parserCache->getDirty( $this, $options );
1397                 if ( $output ) {
1398                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1399                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1400                         $wgOut->setSquidMaxage( 0 );
1401                         $this->mParserOutput = $output;
1402                         $wgOut->addParserOutput( $output );
1403                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1404                         return true;
1405                 } else {
1406                         wfDebugLog( 'dirty', "dirty missing\n" );
1407                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1408                         return false;
1409                 }
1410         }
1411
1412         /**
1413          * Show an error page for an error from the pool counter.
1414          * @param $status Status
1415          */
1416         public function showPoolError( $status ) {
1417                 global $wgOut;
1418                 $wgOut->clearHTML(); // for release() errors
1419                 $wgOut->enableClientCache( false );
1420                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1421                 $wgOut->addWikiText(
1422                         '<div class="errorbox">' .
1423                         $status->getWikiText( false, 'view-pool-error' ) .
1424                         '</div>'
1425                 );
1426         }
1427
1428         /**
1429          * View redirect
1430          *
1431          * @param $target Title object or Array of destination(s) to redirect
1432          * @param $appendSubtitle Boolean [optional]
1433          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1434          * @return string containing HMTL with redirect link
1435          */
1436         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1437                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1438                 # Display redirect
1439                 if ( !is_array( $target ) ) {
1440                         $target = array( $target );
1441                 }
1442                 $imageDir = $wgContLang->getDir();
1443                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1444                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1445                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1446
1447                 if ( $appendSubtitle ) {
1448                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1449                 }
1450                 $sk = $wgUser->getSkin();
1451                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1452                 $title = array_shift( $target );
1453                 if ( $forceKnown ) {
1454                         $link = $sk->link(
1455                                 $title,
1456                                 htmlspecialchars( $title->getFullText() ),
1457                                 array(),
1458                                 array(),
1459                                 array( 'known', 'noclasses' )
1460                         );
1461                 } else {
1462                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1463                 }
1464                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1465                 foreach ( $target as $rt ) {
1466                         if ( $forceKnown ) {
1467                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1468                                         . $sk->link(
1469                                                 $rt,
1470                                                 htmlspecialchars( $rt->getFullText() ),
1471                                                 array(),
1472                                                 array(),
1473                                                 array( 'known', 'noclasses' )
1474                                         );
1475                         } else {
1476                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1477                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1478                         }
1479                 }
1480                 return '<img src="' . $imageUrl . '" alt="#REDIRECT " />' .
1481                         '<span class="redirectText">' . $link . '</span>';
1482
1483         }
1484
1485         /**
1486          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1487          */
1488         public function addTrackbacks() {
1489                 global $wgOut, $wgUser;
1490                 $dbr = wfGetDB( DB_SLAVE );
1491                 $tbs = $dbr->select( 'trackbacks',
1492                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1493                         array( 'tb_page' => $this->getID() )
1494                 );
1495                 if ( !$dbr->numRows( $tbs ) ) return;
1496
1497                 $tbtext = "";
1498                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1499                         $rmvtxt = "";
1500                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1501                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1502                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1503                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1504                         }
1505                         $tbtext .= "\n";
1506                         $tbtext .= wfMsg( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1507                                         $o->tb_title,
1508                                         $o->tb_url,
1509                                         $o->tb_ex,
1510                                         $o->tb_name,
1511                                         $rmvtxt );
1512                 }
1513                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1514         }
1515
1516         /**
1517          * Removes trackback record for current article from trackbacks table
1518          */
1519         public function deletetrackback() {
1520                 global $wgUser, $wgRequest, $wgOut;
1521                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1522                         $wgOut->addWikiMsg( 'sessionfailure' );
1523                         return;
1524                 }
1525
1526                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1527                 if ( count( $permission_errors ) ) {
1528                         $wgOut->showPermissionsErrorPage( $permission_errors );
1529                         return;
1530                 }
1531
1532                 $db = wfGetDB( DB_MASTER );
1533                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1534
1535                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1536                 $this->mTitle->invalidateCache();
1537         }
1538
1539         /**
1540          * Handle action=render
1541          */
1542
1543         public function render() {
1544                 global $wgOut;
1545                 $wgOut->setArticleBodyOnly( true );
1546                 $this->view();
1547         }
1548
1549         /**
1550          * Handle action=purge
1551          */
1552         public function purge() {
1553                 global $wgUser, $wgRequest, $wgOut;
1554                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1555                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1556                                 $this->doPurge();
1557                                 $this->view();
1558                         }
1559                 } else {
1560                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1561                         $button = wfMsgExt( 'confirm_purge_button', array( 'escapenoentities' ) );
1562                         $form = "<form method=\"post\" action=\"$action\">\n" .
1563                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1564                                         "</form>\n";
1565                         $top = wfMsgExt( 'confirm-purge-top', array( 'parse' ) );
1566                         $bottom = wfMsgExt( 'confirm-purge-bottom', array( 'parse' ) );
1567                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1568                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1569                         $wgOut->addHTML( $top . $form . $bottom );
1570                 }
1571         }
1572
1573         /**
1574          * Perform the actions of a page purging
1575          */
1576         public function doPurge() {
1577                 global $wgUseSquid;
1578                 // Invalidate the cache
1579                 $this->mTitle->invalidateCache();
1580
1581                 if ( $wgUseSquid ) {
1582                         // Commit the transaction before the purge is sent
1583                         $dbw = wfGetDB( DB_MASTER );
1584                         $dbw->commit();
1585
1586                         // Send purge
1587                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1588                         $update->doUpdate();
1589                 }
1590                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1591                         global $wgMessageCache;
1592                         if ( $this->getID() == 0 ) {
1593                                 $text = false;
1594                         } else {
1595                                 $text = $this->getRawText();
1596                         }
1597                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1598                 }
1599         }
1600
1601         /**
1602          * Insert a new empty page record for this article.
1603          * This *must* be followed up by creating a revision
1604          * and running $this->updateToLatest( $rev_id );
1605          * or else the record will be left in a funky state.
1606          * Best if all done inside a transaction.
1607          *
1608          * @param $dbw Database
1609          * @return int The newly created page_id key, or false if the title already existed
1610          * @private
1611          */
1612         public function insertOn( $dbw ) {
1613                 wfProfileIn( __METHOD__ );
1614
1615                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1616                 $dbw->insert( 'page', array(
1617                         'page_id'           => $page_id,
1618                         'page_namespace'    => $this->mTitle->getNamespace(),
1619                         'page_title'        => $this->mTitle->getDBkey(),
1620                         'page_counter'      => 0,
1621                         'page_restrictions' => '',
1622                         'page_is_redirect'  => 0, # Will set this shortly...
1623                         'page_is_new'       => 1,
1624                         'page_random'       => wfRandom(),
1625                         'page_touched'      => $dbw->timestamp(),
1626                         'page_latest'       => 0, # Fill this in shortly...
1627                         'page_len'          => 0, # Fill this in shortly...
1628                 ), __METHOD__, 'IGNORE' );
1629
1630                 $affected = $dbw->affectedRows();
1631                 if ( $affected ) {
1632                         $newid = $dbw->insertId();
1633                         $this->mTitle->resetArticleId( $newid );
1634                 }
1635                 wfProfileOut( __METHOD__ );
1636                 return $affected ? $newid : false;
1637         }
1638
1639         /**
1640          * Update the page record to point to a newly saved revision.
1641          *
1642          * @param $dbw Database object
1643          * @param $revision Revision: For ID number, and text used to set
1644                             length and redirect status fields
1645          * @param $lastRevision Integer: if given, will not overwrite the page field
1646          *                      when different from the currently set value.
1647          *                      Giving 0 indicates the new page flag should be set
1648          *                      on.
1649          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1650          *                           removing rows in redirect table.
1651          * @return bool true on success, false on failure
1652          * @private
1653          */
1654         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1655                 wfProfileIn( __METHOD__ );
1656
1657                 $text = $revision->getText();
1658                 $rt = Title::newFromRedirect( $text );
1659
1660                 $conditions = array( 'page_id' => $this->getId() );
1661                 if ( !is_null( $lastRevision ) ) {
1662                         # An extra check against threads stepping on each other
1663                         $conditions['page_latest'] = $lastRevision;
1664                 }
1665
1666                 $dbw->update( 'page',
1667                         array( /* SET */
1668                                 'page_latest'      => $revision->getId(),
1669                                 'page_touched'     => $dbw->timestamp(),
1670                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1671                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1672                                 'page_len'         => strlen( $text ),
1673                         ),
1674                         $conditions,
1675                         __METHOD__ );
1676
1677                 $result = $dbw->affectedRows() != 0;
1678                 if ( $result ) {
1679                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1680                 }
1681
1682                 wfProfileOut( __METHOD__ );
1683                 return $result;
1684         }
1685
1686         /**
1687          * Add row to the redirect table if this is a redirect, remove otherwise.
1688          *
1689          * @param $dbw Database
1690          * @param $redirectTitle a title object pointing to the redirect target,
1691          *                       or NULL if this is not a redirect
1692          * @param $lastRevIsRedirect If given, will optimize adding and
1693          *                           removing rows in redirect table.
1694          * @return bool true on success, false on failure
1695          * @private
1696          */
1697         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1698                 // Always update redirects (target link might have changed)
1699                 // Update/Insert if we don't know if the last revision was a redirect or not
1700                 // Delete if changing from redirect to non-redirect
1701                 $isRedirect = !is_null( $redirectTitle );
1702                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1703                         wfProfileIn( __METHOD__ );
1704                         if ( $isRedirect ) {
1705                                 // This title is a redirect, Add/Update row in the redirect table
1706                                 $set = array( /* SET */
1707                                         'rd_namespace' => $redirectTitle->getNamespace(),
1708                                         'rd_title'     => $redirectTitle->getDBkey(),
1709                                         'rd_from'      => $this->getId(),
1710                                 );
1711                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1712                         } else {
1713                                 // This is not a redirect, remove row from redirect table
1714                                 $where = array( 'rd_from' => $this->getId() );
1715                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1716                         }
1717                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1718                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1719                         }
1720                         wfProfileOut( __METHOD__ );
1721                         return ( $dbw->affectedRows() != 0 );
1722                 }
1723                 return true;
1724         }
1725
1726         /**
1727          * If the given revision is newer than the currently set page_latest,
1728          * update the page record. Otherwise, do nothing.
1729          *
1730          * @param $dbw Database object
1731          * @param $revision Revision object
1732          * @return mixed
1733          */
1734         public function updateIfNewerOn( &$dbw, $revision ) {
1735                 wfProfileIn( __METHOD__ );
1736                 $row = $dbw->selectRow(
1737                         array( 'revision', 'page' ),
1738                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1739                         array(
1740                                 'page_id' => $this->getId(),
1741                                 'page_latest=rev_id' ),
1742                         __METHOD__ );
1743                 if ( $row ) {
1744                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1745                                 wfProfileOut( __METHOD__ );
1746                                 return false;
1747                         }
1748                         $prev = $row->rev_id;
1749                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1750                 } else {
1751                         # No or missing previous revision; mark the page as new
1752                         $prev = 0;
1753                         $lastRevIsRedirect = null;
1754                 }
1755                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1756                 wfProfileOut( __METHOD__ );
1757                 return $ret;
1758         }
1759
1760         /**
1761          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1762          * @return string Complete article text, or null if error
1763          */
1764         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1765                 wfProfileIn( __METHOD__ );
1766                 if ( strval( $section ) == '' ) {
1767                         // Whole-page edit; let the whole text through
1768                 } else {
1769                         if ( is_null( $edittime ) ) {
1770                                 $rev = Revision::newFromTitle( $this->mTitle );
1771                         } else {
1772                                 $dbw = wfGetDB( DB_MASTER );
1773                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1774                         }
1775                         if ( !$rev ) {
1776                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1777                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1778                                 return null;
1779                         }
1780                         $oldtext = $rev->getText();
1781
1782                         if ( $section == 'new' ) {
1783                                 # Inserting a new section
1784                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1785                                 $text = strlen( trim( $oldtext ) ) > 0
1786                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1787                                                 : "{$subject}{$text}";
1788                         } else {
1789                                 # Replacing an existing section; roll out the big guns
1790                                 global $wgParser;
1791                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1792                         }
1793                 }
1794                 wfProfileOut( __METHOD__ );
1795                 return $text;
1796         }
1797
1798         /**
1799          * This function is not deprecated until somebody fixes the core not to use
1800          * it. Nevertheless, use Article::doEdit() instead.
1801          */
1802         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1803                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1804                         ( $isminor ? EDIT_MINOR : 0 ) |
1805                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1806                         ( $bot ? EDIT_FORCE_BOT : 0 );
1807
1808                 # If this is a comment, add the summary as headline
1809                 if ( $comment && $summary != "" ) {
1810                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1811                 }
1812
1813                 $this->doEdit( $text, $summary, $flags );
1814
1815                 $dbw = wfGetDB( DB_MASTER );
1816                 if ( $watchthis ) {
1817                         if ( !$this->mTitle->userIsWatching() ) {
1818                                 $dbw->begin();
1819                                 $this->doWatch();
1820                                 $dbw->commit();
1821                         }
1822                 } else {
1823                         if ( $this->mTitle->userIsWatching() ) {
1824                                 $dbw->begin();
1825                                 $this->doUnwatch();
1826                                 $dbw->commit();
1827                         }
1828                 }
1829                 $this->doRedirect( $this->isRedirect( $text ) );
1830         }
1831
1832         /**
1833          * @deprecated use Article::doEdit()
1834          */
1835         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1836                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1837                         ( $minor ? EDIT_MINOR : 0 ) |
1838                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1839
1840                 $status = $this->doEdit( $text, $summary, $flags );
1841                 if ( !$status->isOK() ) {
1842                         return false;
1843                 }
1844
1845                 $dbw = wfGetDB( DB_MASTER );
1846                 if ( $watchthis ) {
1847                         if ( !$this->mTitle->userIsWatching() ) {
1848                                 $dbw->begin();
1849                                 $this->doWatch();
1850                                 $dbw->commit();
1851                         }
1852                 } else {
1853                         if ( $this->mTitle->userIsWatching() ) {
1854                                 $dbw->begin();
1855                                 $this->doUnwatch();
1856                                 $dbw->commit();
1857                         }
1858                 }
1859
1860                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1861                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1862
1863                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1864                 return true;
1865         }
1866
1867         /**
1868          * Article::doEdit()
1869          *
1870          * Change an existing article or create a new article. Updates RC and all necessary caches,
1871          * optionally via the deferred update array.
1872          *
1873          * $wgUser must be set before calling this function.
1874          *
1875          * @param $text String: new text
1876          * @param $summary String: edit summary
1877          * @param $flags Integer bitfield:
1878          *      EDIT_NEW
1879          *          Article is known or assumed to be non-existent, create a new one
1880          *      EDIT_UPDATE
1881          *          Article is known or assumed to be pre-existing, update it
1882          *      EDIT_MINOR
1883          *          Mark this edit minor, if the user is allowed to do so
1884          *      EDIT_SUPPRESS_RC
1885          *          Do not log the change in recentchanges
1886          *      EDIT_FORCE_BOT
1887          *          Mark the edit a "bot" edit regardless of user rights
1888          *      EDIT_DEFER_UPDATES
1889          *          Defer some of the updates until the end of index.php
1890          *      EDIT_AUTOSUMMARY
1891          *          Fill in blank summaries with generated text where possible
1892          *
1893          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1894          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1895          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1896          * edit-already-exists error will be returned. These two conditions are also possible with
1897          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1898          *
1899          * @param $baseRevId the revision ID this edit was based off, if any
1900          * @param $user Optional user object, $wgUser will be used if not passed
1901          *
1902          * @return Status object. Possible errors:
1903          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1904          *     edit-gone-missing:       In update mode, but the article didn't exist
1905          *     edit-conflict:           In update mode, the article changed unexpectedly
1906          *     edit-no-change:          Warning that the text was the same as before
1907          *     edit-already-exists:     In creation mode, but the article already exists
1908          *
1909          *  Extensions may define additional errors.
1910          *
1911          *  $return->value will contain an associative array with members as follows:
1912          *     new:                     Boolean indicating if the function attempted to create a new article
1913          *     revision:                The revision object for the inserted revision, or null
1914          *
1915          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1916          */
1917         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1918                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1919
1920                 # Low-level sanity check
1921                 if ( $this->mTitle->getText() == '' ) {
1922                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1923                 }
1924
1925                 wfProfileIn( __METHOD__ );
1926
1927                 $user = is_null( $user ) ? $wgUser : $user;
1928                 $status = Status::newGood( array() );
1929
1930                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1931                 $this->loadPageData();
1932
1933                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1934                         $aid = $this->mTitle->getArticleID();
1935                         if ( $aid ) {
1936                                 $flags |= EDIT_UPDATE;
1937                         } else {
1938                                 $flags |= EDIT_NEW;
1939                         }
1940                 }
1941
1942                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1943                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1944                 {
1945                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1946                         wfProfileOut( __METHOD__ );
1947                         if ( $status->isOK() ) {
1948                                 $status->fatal( 'edit-hook-aborted' );
1949                         }
1950                         return $status;
1951                 }
1952
1953                 # Silently ignore EDIT_MINOR if not allowed
1954                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1955                 $bot = $flags & EDIT_FORCE_BOT;
1956
1957                 $oldtext = $this->getRawText(); // current revision
1958                 $oldsize = strlen( $oldtext );
1959
1960                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1961                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1962                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1963                 }
1964
1965                 $editInfo = $this->prepareTextForEdit( $text );
1966                 $text = $editInfo->pst;
1967                 $newsize = strlen( $text );
1968
1969                 $dbw = wfGetDB( DB_MASTER );
1970                 $now = wfTimestampNow();
1971                 $this->mTimestamp = $now;
1972
1973                 if ( $flags & EDIT_UPDATE ) {
1974                         # Update article, but only if changed.
1975                         $status->value['new'] = false;
1976                         # Make sure the revision is either completely inserted or not inserted at all
1977                         if ( !$wgDBtransactions ) {
1978                                 $userAbort = ignore_user_abort( true );
1979                         }
1980
1981                         $revisionId = 0;
1982
1983                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1984
1985                         if ( $changed ) {
1986                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1987                                   - (int)$this->isCountable( $oldtext );
1988                                 $this->mTotalAdjustment = 0;
1989
1990                                 if ( !$this->mLatest ) {
1991                                         # Article gone missing
1992                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1993                                         $status->fatal( 'edit-gone-missing' );
1994                                         wfProfileOut( __METHOD__ );
1995                                         return $status;
1996                                 }
1997
1998                                 $revision = new Revision( array(
1999                                         'page'       => $this->getId(),
2000                                         'comment'    => $summary,
2001                                         'minor_edit' => $isminor,
2002                                         'text'       => $text,
2003                                         'parent_id'  => $this->mLatest,
2004                                         'user'       => $user->getId(),
2005                                         'user_text'  => $user->getName(),
2006                                         ) );
2007
2008                                 $dbw->begin();
2009                                 $revisionId = $revision->insertOn( $dbw );
2010
2011                                 # Update page
2012                                 #
2013                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2014                                 # during the course of this function. This makes sure that EditPage can detect
2015                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2016                                 # before this function is called. A previous function used a separate query, this
2017                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2018                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2019
2020                                 if ( !$ok ) {
2021                                         /* Belated edit conflict! Run away!! */
2022                                         $status->fatal( 'edit-conflict' );
2023                                         # Delete the invalid revision if the DB is not transactional
2024                                         if ( !$wgDBtransactions ) {
2025                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2026                                         }
2027                                         $revisionId = 0;
2028                                         $dbw->rollback();
2029                                 } else {
2030                                         global $wgUseRCPatrol;
2031                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2032                                         # Update recentchanges
2033                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2034                                                 # Mark as patrolled if the user can do so
2035                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2036                                                 # Add RC row to the DB
2037                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2038                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2039                                                         $revisionId, $patrolled
2040                                                 );
2041                                                 # Log auto-patrolled edits
2042                                                 if ( $patrolled ) {
2043                                                         PatrolLog::record( $rc, true );
2044                                                 }
2045                                         }
2046                                         $user->incEditCount();
2047                                         $dbw->commit();
2048                                 }
2049                         } else {
2050                                 $status->warning( 'edit-no-change' );
2051                                 $revision = null;
2052                                 // Keep the same revision ID, but do some updates on it
2053                                 $revisionId = $this->getRevIdFetched();
2054                                 // Update page_touched, this is usually implicit in the page update
2055                                 // Other cache updates are done in onArticleEdit()
2056                                 $this->mTitle->invalidateCache();
2057                         }
2058
2059                         if ( !$wgDBtransactions ) {
2060                                 ignore_user_abort( $userAbort );
2061                         }
2062                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2063                         if ( !$status->isOK() ) {
2064                                 wfProfileOut( __METHOD__ );
2065                                 return $status;
2066                         }
2067
2068                         # Invalidate cache of this article and all pages using this article
2069                         # as a template. Partly deferred.
2070                         Article::onArticleEdit( $this->mTitle );
2071                         # Update links tables, site stats, etc.
2072                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2073                 } else {
2074                         # Create new article
2075                         $status->value['new'] = true;
2076
2077                         # Set statistics members
2078                         # We work out if it's countable after PST to avoid counter drift
2079                         # when articles are created with {{subst:}}
2080                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2081                         $this->mTotalAdjustment = 1;
2082
2083                         $dbw->begin();
2084
2085                         # Add the page record; stake our claim on this title!
2086                         # This will return false if the article already exists
2087                         $newid = $this->insertOn( $dbw );
2088
2089                         if ( $newid === false ) {
2090                                 $dbw->rollback();
2091                                 $status->fatal( 'edit-already-exists' );
2092                                 wfProfileOut( __METHOD__ );
2093                                 return $status;
2094                         }
2095
2096                         # Save the revision text...
2097                         $revision = new Revision( array(
2098                                 'page'       => $newid,
2099                                 'comment'    => $summary,
2100                                 'minor_edit' => $isminor,
2101                                 'text'       => $text,
2102                                 'user'       => $user->getId(),
2103                                 'user_text'  => $user->getName(),
2104                                 ) );
2105                         $revisionId = $revision->insertOn( $dbw );
2106
2107                         $this->mTitle->resetArticleID( $newid );
2108
2109                         # Update the page record with revision data
2110                         $this->updateRevisionOn( $dbw, $revision, 0 );
2111
2112                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2113                         # Update recentchanges
2114                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2115                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2116                                 # Mark as patrolled if the user can do so
2117                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2118                                 # Add RC row to the DB
2119                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2120                                         '', strlen( $text ), $revisionId, $patrolled );
2121                                 # Log auto-patrolled edits
2122                                 if ( $patrolled ) {
2123                                         PatrolLog::record( $rc, true );
2124                                 }
2125                         }
2126                         $user->incEditCount();
2127                         $dbw->commit();
2128
2129                         # Update links, etc.
2130                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2131
2132                         # Clear caches
2133                         Article::onArticleCreate( $this->mTitle );
2134
2135                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2136                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2137                 }
2138
2139                 # Do updates right now unless deferral was requested
2140                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2141                         wfDoUpdates();
2142                 }
2143
2144                 // Return the new revision (or null) to the caller
2145                 $status->value['revision'] = $revision;
2146
2147                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2148                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2149
2150                 wfProfileOut( __METHOD__ );
2151                 return $status;
2152         }
2153
2154         /**
2155          * @deprecated wrapper for doRedirect
2156          */
2157         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2158                 wfDeprecated( __METHOD__ );
2159                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2160         }
2161
2162         /**
2163          * Output a redirect back to the article.
2164          * This is typically used after an edit.
2165          *
2166          * @param $noRedir Boolean: add redirect=no
2167          * @param $sectionAnchor String: section to redirect to, including "#"
2168          * @param $extraQuery String: extra query params
2169          */
2170         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2171                 global $wgOut;
2172                 if ( $noRedir ) {
2173                         $query = 'redirect=no';
2174                         if ( $extraQuery )
2175                                 $query .= "&$query";
2176                 } else {
2177                         $query = $extraQuery;
2178                 }
2179                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2180         }
2181
2182         /**
2183          * Mark this particular edit/page as patrolled
2184          */
2185         public function markpatrolled() {
2186                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2187                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2188
2189                 # If we haven't been given an rc_id value, we can't do anything
2190                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2191                 $rc = RecentChange::newFromId( $rcid );
2192                 if ( is_null( $rc ) ) {
2193                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2194                         return;
2195                 }
2196
2197                 # It would be nice to see where the user had actually come from, but for now just guess
2198                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2199                 $return = SpecialPage::getTitleFor( $returnto );
2200
2201                 $dbw = wfGetDB( DB_MASTER );
2202                 $errors = $rc->doMarkPatrolled();
2203
2204                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2205                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2206                         return;
2207                 }
2208
2209                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2210                         // The hook itself has handled any output
2211                         return;
2212                 }
2213
2214                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2215                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2216                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2217                         $wgOut->returnToMain( false, $return );
2218                         return;
2219                 }
2220
2221                 if ( !empty( $errors ) ) {
2222                         $wgOut->showPermissionsErrorPage( $errors );
2223                         return;
2224                 }
2225
2226                 # Inform the user
2227                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2228                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2229                 $wgOut->returnToMain( false, $return );
2230         }
2231
2232         /**
2233          * User-interface handler for the "watch" action
2234          */
2235         public function watch() {
2236                 global $wgUser, $wgOut;
2237                 if ( $wgUser->isAnon() ) {
2238                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2239                         return;
2240                 }
2241                 if ( wfReadOnly() ) {
2242                         $wgOut->readOnlyPage();
2243                         return;
2244                 }
2245                 if ( $this->doWatch() ) {
2246                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2247                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2248                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2249                 }
2250                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2251         }
2252
2253         /**
2254          * Add this page to $wgUser's watchlist
2255          * @return bool true on successful watch operation
2256          */
2257         public function doWatch() {
2258                 global $wgUser;
2259                 if ( $wgUser->isAnon() ) {
2260                         return false;
2261                 }
2262                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2263                         $wgUser->addWatch( $this->mTitle );
2264                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2265                 }
2266                 return false;
2267         }
2268
2269         /**
2270          * User interface handler for the "unwatch" action.
2271          */
2272         public function unwatch() {
2273                 global $wgUser, $wgOut;
2274                 if ( $wgUser->isAnon() ) {
2275                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2276                         return;
2277                 }
2278                 if ( wfReadOnly() ) {
2279                         $wgOut->readOnlyPage();
2280                         return;
2281                 }
2282                 if ( $this->doUnwatch() ) {
2283                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2284                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2285                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2286                 }
2287                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2288         }
2289
2290         /**
2291          * Stop watching a page
2292          * @return bool true on successful unwatch
2293          */
2294         public function doUnwatch() {
2295                 global $wgUser;
2296                 if ( $wgUser->isAnon() ) {
2297                         return false;
2298                 }
2299                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2300                         $wgUser->removeWatch( $this->mTitle );
2301                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2302                 }
2303                 return false;
2304         }
2305
2306         /**
2307          * action=protect handler
2308          */
2309         public function protect() {
2310                 $form = new ProtectionForm( $this );
2311                 $form->execute();
2312         }
2313
2314         /**
2315          * action=unprotect handler (alias)
2316          */
2317         public function unprotect() {
2318                 $this->protect();
2319         }
2320
2321         /**
2322          * Update the article's restriction field, and leave a log entry.
2323          *
2324          * @param $limit Array: set of restriction keys
2325          * @param $reason String
2326          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2327          * @param $expiry Array: per restriction type expiration
2328          * @return bool true on success
2329          */
2330         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2331                 global $wgUser, $wgContLang;
2332
2333                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2334
2335                 $id = $this->mTitle->getArticleID();
2336                 if ( $id <= 0 ) {
2337                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2338                         return false;
2339                 }
2340
2341                 if ( wfReadOnly() ) {
2342                         wfDebug( "updateRestrictions failed: read-only\n" );
2343                         return false;
2344                 }
2345
2346                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2347                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2348                         return false;
2349                 }
2350
2351                 if ( !$cascade ) {
2352                         $cascade = false;
2353                 }
2354
2355                 // Take this opportunity to purge out expired restrictions
2356                 Title::purgeExpiredRestrictions();
2357
2358                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2359                 # we expect a single selection, but the schema allows otherwise.
2360                 $current = array();
2361                 $updated = Article::flattenRestrictions( $limit );
2362                 $changed = false;
2363                 foreach ( $restrictionTypes as $action ) {
2364                         if ( isset( $expiry[$action] ) ) {
2365                                 # Get current restrictions on $action
2366                                 $aLimits = $this->mTitle->getRestrictions( $action );
2367                                 $current[$action] = implode( '', $aLimits );
2368                                 # Are any actual restrictions being dealt with here?
2369                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2370                                 # If something changed, we need to log it. Checking $aRChanged
2371                                 # assures that "unprotecting" a page that is not protected does
2372                                 # not log just because the expiry was "changed".
2373                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2374                                         $changed = true;
2375                                 }
2376                         }
2377                 }
2378
2379                 $current = Article::flattenRestrictions( $current );
2380
2381                 $changed = ( $changed || $current != $updated );
2382                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2383                 $protect = ( $updated != '' );
2384
2385                 # If nothing's changed, do nothing
2386                 if ( $changed ) {
2387                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2388
2389                                 $dbw = wfGetDB( DB_MASTER );
2390
2391                                 # Prepare a null revision to be added to the history
2392                                 $modified = $current != '' && $protect;
2393                                 if ( $protect ) {
2394                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2395                                 } else {
2396                                         $comment_type = 'unprotectedarticle';
2397                                 }
2398                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2399
2400                                 # Only restrictions with the 'protect' right can cascade...
2401                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2402                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2403                                 # The schema allows multiple restrictions
2404                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) )
2405                                         $cascade = false;
2406                                 $cascade_description = '';
2407                                 if ( $cascade ) {
2408                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2409                                 }
2410
2411                                 if ( $reason )
2412                                         $comment .= ": $reason";
2413
2414                                 $editComment = $comment;
2415                                 $encodedExpiry = array();
2416                                 $protect_description = '';
2417                                 foreach ( $limit as $action => $restrictions  ) {
2418                                         if ( !isset( $expiry[$action] ) )
2419                                                 $expiry[$action] = 'infinite';
2420
2421                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2422                                         if ( $restrictions != '' ) {
2423                                                 $protect_description .= "[$action=$restrictions] (";
2424                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2425                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2426                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2427                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2428                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2429                                                 } else {
2430                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2431                                                 }
2432                                                 $protect_description .= ') ';
2433                                         }
2434                                 }
2435                                 $protect_description = trim( $protect_description );
2436
2437                                 if ( $protect_description && $protect )
2438                                         $editComment .= " ($protect_description)";
2439                                 if ( $cascade )
2440                                         $editComment .= "$cascade_description";
2441                                 # Update restrictions table
2442                                 foreach ( $limit as $action => $restrictions ) {
2443                                         if ( $restrictions != '' ) {
2444                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2445                                                         array( 'pr_page' => $id,
2446                                                                 'pr_type' => $action,
2447                                                                 'pr_level' => $restrictions,
2448                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2449                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2450                                         } else {
2451                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2452                                                         'pr_type' => $action ), __METHOD__ );
2453                                         }
2454                                 }
2455
2456                                 # Insert a null revision
2457                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2458                                 $nullRevId = $nullRevision->insertOn( $dbw );
2459
2460                                 $latest = $this->getLatest();
2461                                 # Update page record
2462                                 $dbw->update( 'page',
2463                                         array( /* SET */
2464                                                 'page_touched' => $dbw->timestamp(),
2465                                                 'page_restrictions' => '',
2466                                                 'page_latest' => $nullRevId
2467                                         ), array( /* WHERE */
2468                                                 'page_id' => $id
2469                                         ), 'Article::protect'
2470                                 );
2471
2472                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2473                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2474
2475                                 # Update the protection log
2476                                 $log = new LogPage( 'protect' );
2477                                 if ( $protect ) {
2478                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2479                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2480                                 } else {
2481                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2482                                 }
2483
2484                         } # End hook
2485                 } # End "changed" check
2486
2487                 return true;
2488         }
2489
2490         /**
2491          * Take an array of page restrictions and flatten it to a string
2492          * suitable for insertion into the page_restrictions field.
2493          * @param $limit Array
2494          * @return String
2495          */
2496         protected static function flattenRestrictions( $limit ) {
2497                 if ( !is_array( $limit ) ) {
2498                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2499                 }
2500                 $bits = array();
2501                 ksort( $limit );
2502                 foreach ( $limit as $action => $restrictions ) {
2503                         if ( $restrictions != '' ) {
2504                                 $bits[] = "$action=$restrictions";
2505                         }
2506                 }
2507                 return implode( ':', $bits );
2508         }
2509
2510         /**
2511          * Auto-generates a deletion reason
2512          *
2513          * @param &$hasHistory Boolean: whether the page has a history
2514          * @return mixed String containing deletion reason or empty string, or boolean false
2515          *    if no revision occurred
2516          */
2517         public function generateReason( &$hasHistory ) {
2518                 global $wgContLang;
2519                 $dbw = wfGetDB( DB_MASTER );
2520                 // Get the last revision
2521                 $rev = Revision::newFromTitle( $this->mTitle );
2522                 if ( is_null( $rev ) )
2523                         return false;
2524
2525                 // Get the article's contents
2526                 $contents = $rev->getText();
2527                 $blank = false;
2528                 // If the page is blank, use the text from the previous revision,
2529                 // which can only be blank if there's a move/import/protect dummy revision involved
2530                 if ( $contents == '' ) {
2531                         $prev = $rev->getPrevious();
2532                         if ( $prev )    {
2533                                 $contents = $prev->getText();
2534                                 $blank = true;
2535                         }
2536                 }
2537
2538                 // Find out if there was only one contributor
2539                 // Only scan the last 20 revisions
2540                 $res = $dbw->select( 'revision', 'rev_user_text',
2541                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2542                         __METHOD__,
2543                         array( 'LIMIT' => 20 )
2544                 );
2545                 if ( $res === false )
2546                         // This page has no revisions, which is very weird
2547                         return false;
2548
2549                 $hasHistory = ( $res->numRows() > 1 );
2550                 $row = $dbw->fetchObject( $res );
2551                 if ( $row ) { // $row is false if the only contributor is hidden
2552                         $onlyAuthor = $row->rev_user_text;
2553                         // Try to find a second contributor
2554                         foreach ( $res as $row ) {
2555                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2556                                         $onlyAuthor = false;
2557                                         break;
2558                                 }
2559                         }
2560                 } else {
2561                         $onlyAuthor = false;
2562                 }
2563                 $dbw->freeResult( $res );
2564
2565                 // Generate the summary with a '$1' placeholder
2566                 if ( $blank ) {
2567                         // The current revision is blank and the one before is also
2568                         // blank. It's just not our lucky day
2569                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2570                 } else {
2571                         if ( $onlyAuthor )
2572                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2573                         else
2574                                 $reason = wfMsgForContent( 'excontent', '$1' );
2575                 }
2576
2577                 if ( $reason == '-' ) {
2578                         // Allow these UI messages to be blanked out cleanly
2579                         return '';
2580                 }
2581
2582                 // Replace newlines with spaces to prevent uglyness
2583                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2584                 // Calculate the maximum amount of chars to get
2585                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2586                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2587                 $contents = $wgContLang->truncate( $contents, $maxLength );
2588                 // Remove possible unfinished links
2589                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2590                 // Now replace the '$1' placeholder
2591                 $reason = str_replace( '$1', $contents, $reason );
2592                 return $reason;
2593         }
2594
2595
2596         /*
2597          * UI entry point for page deletion
2598          */
2599         public function delete() {
2600                 global $wgUser, $wgOut, $wgRequest;
2601
2602                 $confirm = $wgRequest->wasPosted() &&
2603                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2604
2605                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2606                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2607
2608                 $reason = $this->DeleteReasonList;
2609
2610                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2611                         // Entry from drop down menu + additional comment
2612                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2613                 } elseif ( $reason == 'other' ) {
2614                         $reason = $this->DeleteReason;
2615                 }
2616                 # Flag to hide all contents of the archived revisions
2617                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2618
2619                 # This code desperately needs to be totally rewritten
2620
2621                 # Read-only check...
2622                 if ( wfReadOnly() ) {
2623                         $wgOut->readOnlyPage();
2624                         return;
2625                 }
2626
2627                 # Check permissions
2628                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2629
2630                 if ( count( $permission_errors ) > 0 ) {
2631                         $wgOut->showPermissionsErrorPage( $permission_errors );
2632                         return;
2633                 }
2634
2635                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2636
2637                 # Better double-check that it hasn't been deleted yet!
2638                 $dbw = wfGetDB( DB_MASTER );
2639                 $conds = $this->mTitle->pageCond();
2640                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2641                 if ( $latest === false ) {
2642                         $wgOut->showFatalError(
2643                                 Html::rawElement(
2644                                         'div',
2645                                         array( 'class' => 'error mw-error-cannotdelete' ),
2646                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2647                                 )
2648                         );
2649                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2650                         LogEventsList::showLogExtract(
2651                                 $wgOut,
2652                                 'delete',
2653                                 $this->mTitle->getPrefixedText()
2654                         );
2655                         return;
2656                 }
2657
2658                 # Hack for big sites
2659                 $bigHistory = $this->isBigDeletion();
2660                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2661                         global $wgLang, $wgDeleteRevisionsLimit;
2662                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2663                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2664                         return;
2665                 }
2666
2667                 if ( $confirm ) {
2668                         $this->doDelete( $reason, $suppress );
2669                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2670                                 $this->doWatch();
2671                         } elseif ( $this->mTitle->userIsWatching() ) {
2672                                 $this->doUnwatch();
2673                         }
2674                         return;
2675                 }
2676
2677                 // Generate deletion reason
2678                 $hasHistory = false;
2679                 if ( !$reason ) $reason = $this->generateReason( $hasHistory );
2680
2681                 // If the page has a history, insert a warning
2682                 if ( $hasHistory && !$confirm ) {
2683                         global $wgLang;
2684                         $skin = $wgUser->getSkin();
2685                         $revisions = $this->estimateRevisionCount();
2686                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2687                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2688                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2689                                 '</strong>'
2690                         );
2691                         if ( $bigHistory ) {
2692                                 global $wgDeleteRevisionsLimit;
2693                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2694                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2695                         }
2696                 }
2697
2698                 return $this->confirmDelete( $reason );
2699         }
2700
2701         /**
2702          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2703          */
2704         public function isBigDeletion() {
2705                 global $wgDeleteRevisionsLimit;
2706                 if ( $wgDeleteRevisionsLimit ) {
2707                         $revCount = $this->estimateRevisionCount();
2708                         return $revCount > $wgDeleteRevisionsLimit;
2709                 }
2710                 return false;
2711         }
2712
2713         /**
2714          * @return int approximate revision count
2715          */
2716         public function estimateRevisionCount() {
2717                 $dbr = wfGetDB( DB_SLAVE );
2718                 // For an exact count...
2719                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2720                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2721                 return $dbr->estimateRowCount( 'revision', '*',
2722                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2723         }
2724
2725         /**
2726          * Get the last N authors
2727          * @param $num Integer: number of revisions to get
2728          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2729          * @return array Array of authors, duplicates not removed
2730          */
2731         public function getLastNAuthors( $num, $revLatest = 0 ) {
2732                 wfProfileIn( __METHOD__ );
2733                 // First try the slave
2734                 // If that doesn't have the latest revision, try the master
2735                 $continue = 2;
2736                 $db = wfGetDB( DB_SLAVE );
2737                 do {
2738                         $res = $db->select( array( 'page', 'revision' ),
2739                                 array( 'rev_id', 'rev_user_text' ),
2740                                 array(
2741                                         'page_namespace' => $this->mTitle->getNamespace(),
2742                                         'page_title' => $this->mTitle->getDBkey(),
2743                                         'rev_page = page_id'
2744                                 ), __METHOD__, $this->getSelectOptions( array(
2745                                         'ORDER BY' => 'rev_timestamp DESC',
2746                                         'LIMIT' => $num
2747                                 ) )
2748                         );
2749                         if ( !$res ) {
2750                                 wfProfileOut( __METHOD__ );
2751                                 return array();
2752                         }
2753                         $row = $db->fetchObject( $res );
2754                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2755                                 $db = wfGetDB( DB_MASTER );
2756                                 $continue--;
2757                         } else {
2758                                 $continue = 0;
2759                         }
2760                 } while ( $continue );
2761
2762                 $authors = array( $row->rev_user_text );
2763                 while ( $row = $db->fetchObject( $res ) ) {
2764                         $authors[] = $row->rev_user_text;
2765                 }
2766                 wfProfileOut( __METHOD__ );
2767                 return $authors;
2768         }
2769
2770         /**
2771          * Output deletion confirmation dialog
2772          * @param $reason String: prefilled reason
2773          */
2774         public function confirmDelete( $reason ) {
2775                 global $wgOut, $wgUser;
2776
2777                 wfDebug( "Article::confirmDelete\n" );
2778
2779                 $deleteBackLink = $wgUser->getSkin()->link(
2780                         $this->mTitle,
2781                         null,
2782                         array(),
2783                         array(),
2784                         array( 'known', 'noclasses' )
2785                 );
2786                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2787                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2788                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2789
2790                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2791
2792                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
2793                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2794                                         <td></td>
2795                                         <td class='mw-input'><strong>" .
2796                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2797                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2798                                         "</strong></td>
2799                                 </tr>";
2800                 } else {
2801                         $suppress = '';
2802                 }
2803                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2804
2805                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2806                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2807                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2808                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2809                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2810                         "<tr id=\"wpDeleteReasonListRow\">
2811                                 <td class='mw-label'>" .
2812                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2813                                 "</td>
2814                                 <td class='mw-input'>" .
2815                                         Xml::listDropDown( 'wpDeleteReasonList',
2816                                                 wfMsgForContent( 'deletereason-dropdown' ),
2817                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2818                                 "</td>
2819                         </tr>
2820                         <tr id=\"wpDeleteReasonRow\">
2821                                 <td class='mw-label'>" .
2822                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2823                                 "</td>
2824                                 <td class='mw-input'>" .
2825                                 Html::input( 'wpReason', $reason, 'text', array(
2826                                         'size' => '60',
2827                                         'maxlength' => '255',
2828                                         'tabindex' => '2',
2829                                         'id' => 'wpReason',
2830                                         'autofocus'
2831                                 ) ) .
2832                                 "</td>
2833                         </tr>";
2834                 # Dissalow watching is user is not logged in
2835                 if ( $wgUser->isLoggedIn() ) {
2836                         $form .= "
2837                         <tr>
2838                                 <td></td>
2839                                 <td class='mw-input'>" .
2840                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2841                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2842                                 "</td>
2843                         </tr>";
2844                 }
2845                 $form .= "
2846                         $suppress
2847                         <tr>
2848                                 <td></td>
2849                                 <td class='mw-submit'>" .
2850                                         Xml::submitButton( wfMsg( 'deletepage' ),
2851                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2852                                 "</td>
2853                         </tr>" .
2854                         Xml::closeElement( 'table' ) .
2855                         Xml::closeElement( 'fieldset' ) .
2856                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2857                         Xml::closeElement( 'form' );
2858
2859                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2860                                 $skin = $wgUser->getSkin();
2861                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2862                                 $link = $skin->link(
2863                                         $title,
2864                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2865                                         array(),
2866                                         array( 'action' => 'edit' )
2867                                 );
2868                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2869                         }
2870
2871                 $wgOut->addHTML( $form );
2872                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2873                 LogEventsList::showLogExtract(
2874                         $wgOut,
2875                         'delete',
2876                         $this->mTitle->getPrefixedText()
2877                 );
2878         }
2879
2880         /**
2881          * Perform a deletion and output success or failure messages
2882          */
2883         public function doDelete( $reason, $suppress = false ) {
2884                 global $wgOut, $wgUser;
2885                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2886
2887                 $error = '';
2888                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
2889                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2890                                 $deleted = $this->mTitle->getPrefixedText();
2891
2892                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2893                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2894
2895                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2896
2897                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2898                                 $wgOut->returnToMain( false );
2899                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
2900                         }
2901                 } else {
2902                         if ( $error == '' ) {
2903                                 $wgOut->showFatalError(
2904                                         Html::rawElement(
2905                                                 'div',
2906                                                 array( 'class' => 'error mw-error-cannotdelete' ),
2907                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2908                                         )
2909                                 );
2910                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2911                                 LogEventsList::showLogExtract(
2912                                         $wgOut,
2913                                         'delete',
2914                                         $this->mTitle->getPrefixedText()
2915                                 );
2916                         } else {
2917                                 $wgOut->showFatalError( $error );
2918                         }
2919                 }
2920         }
2921
2922         /**
2923          * Back-end article deletion
2924          * Deletes the article with database consistency, writes logs, purges caches
2925          *
2926          * @param $reason string delete reason for deletion log
2927          * @param suppress bitfield
2928          *      Revision::DELETED_TEXT
2929          *      Revision::DELETED_COMMENT
2930          *      Revision::DELETED_USER
2931          *      Revision::DELETED_RESTRICTED
2932          * @param $id int article ID
2933          * @param $commit boolean defaults to true, triggers transaction end
2934          * @return boolean true if successful
2935          */
2936         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
2937                 global $wgUseSquid, $wgDeferredUpdateList;
2938                 global $wgUseTrackbacks;
2939
2940                 wfDebug( __METHOD__ . "\n" );
2941
2942                 $dbw = wfGetDB( DB_MASTER );
2943                 $ns = $this->mTitle->getNamespace();
2944                 $t = $this->mTitle->getDBkey();
2945                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2946
2947                 if ( $t == '' || $id == 0 ) {
2948                         return false;
2949                 }
2950
2951                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
2952                 array_push( $wgDeferredUpdateList, $u );
2953
2954                 // Bitfields to further suppress the content
2955                 if ( $suppress ) {
2956                         $bitfield = 0;
2957                         // This should be 15...
2958                         $bitfield |= Revision::DELETED_TEXT;
2959                         $bitfield |= Revision::DELETED_COMMENT;
2960                         $bitfield |= Revision::DELETED_USER;
2961                         $bitfield |= Revision::DELETED_RESTRICTED;
2962                 } else {
2963                         $bitfield = 'rev_deleted';
2964                 }
2965
2966                 $dbw->begin();
2967                 // For now, shunt the revision data into the archive table.
2968                 // Text is *not* removed from the text table; bulk storage
2969                 // is left intact to avoid breaking block-compression or
2970                 // immutable storage schemes.
2971                 //
2972                 // For backwards compatibility, note that some older archive
2973                 // table entries will have ar_text and ar_flags fields still.
2974                 //
2975                 // In the future, we may keep revisions and mark them with
2976                 // the rev_deleted field, which is reserved for this purpose.
2977                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2978                         array(
2979                                 'ar_namespace'  => 'page_namespace',
2980                                 'ar_title'      => 'page_title',
2981                                 'ar_comment'    => 'rev_comment',
2982                                 'ar_user'       => 'rev_user',
2983                                 'ar_user_text'  => 'rev_user_text',
2984                                 'ar_timestamp'  => 'rev_timestamp',
2985                                 'ar_minor_edit' => 'rev_minor_edit',
2986                                 'ar_rev_id'     => 'rev_id',
2987                                 'ar_text_id'    => 'rev_text_id',
2988                                 'ar_text'       => '\'\'', // Be explicit to appease
2989                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2990                                 'ar_len'        => 'rev_len',
2991                                 'ar_page_id'    => 'page_id',
2992                                 'ar_deleted'    => $bitfield
2993                         ), array(
2994                                 'page_id' => $id,
2995                                 'page_id = rev_page'
2996                         ), __METHOD__
2997                 );
2998
2999                 # Delete restrictions for it
3000                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3001
3002                 # Now that it's safely backed up, delete it
3003                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3004                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3005                 if ( !$ok ) {
3006                         $dbw->rollback();
3007                         return false;
3008                 }
3009
3010                 # Fix category table counts
3011                 $cats = array();
3012                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3013                 foreach ( $res as $row ) {
3014                         $cats [] = $row->cl_to;
3015                 }
3016                 $this->updateCategoryCounts( array(), $cats );
3017
3018                 # If using cascading deletes, we can skip some explicit deletes
3019                 if ( !$dbw->cascadingDeletes() ) {
3020                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3021
3022                         if ( $wgUseTrackbacks )
3023                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3024
3025                         # Delete outgoing links
3026                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3027                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3028                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3029                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3030                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3031                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3032                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3033                 }
3034
3035                 # If using cleanup triggers, we can skip some manual deletes
3036                 if ( !$dbw->cleanupTriggers() ) {
3037                         # Clean up recentchanges entries...
3038                         $dbw->delete( 'recentchanges',
3039                                 array( 'rc_type != ' . RC_LOG,
3040                                         'rc_namespace' => $this->mTitle->getNamespace(),
3041                                         'rc_title' => $this->mTitle->getDBkey() ),
3042                                 __METHOD__ );
3043                         $dbw->delete( 'recentchanges',
3044                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3045                                 __METHOD__ );
3046                 }
3047
3048                 # Clear caches
3049                 Article::onArticleDelete( $this->mTitle );
3050
3051                 # Clear the cached article id so the interface doesn't act like we exist
3052                 $this->mTitle->resetArticleID( 0 );
3053
3054                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3055                 $logtype = $suppress ? 'suppress' : 'delete';
3056                 $log = new LogPage( $logtype );
3057
3058                 # Make sure logging got through
3059                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3060
3061                 if ( $commit ) {
3062                         $dbw->commit();
3063                 }
3064
3065                 return true;
3066         }
3067
3068         /**
3069          * Roll back the most recent consecutive set of edits to a page
3070          * from the same user; fails if there are no eligible edits to
3071          * roll back to, e.g. user is the sole contributor. This function
3072          * performs permissions checks on $wgUser, then calls commitRollback()
3073          * to do the dirty work
3074          *
3075          * @param $fromP String: Name of the user whose edits to rollback.
3076          * @param $summary String: Custom summary. Set to default summary if empty.
3077          * @param $token String: Rollback token.
3078          * @param $bot Boolean: If true, mark all reverted edits as bot.
3079          *
3080          * @param $resultDetails Array: contains result-specific array of additional values
3081          *    'alreadyrolled' : 'current' (rev)
3082          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3083          *
3084          * @return array of errors, each error formatted as
3085          *   array(messagekey, param1, param2, ...).
3086          * On success, the array is empty.  This array can also be passed to
3087          * OutputPage::showPermissionsErrorPage().
3088          */
3089         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3090                 global $wgUser;
3091                 $resultDetails = null;
3092
3093                 # Check permissions
3094                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3095                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3096                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3097
3098                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
3099                         $errors[] = array( 'sessionfailure' );
3100
3101                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3102                         $errors[] = array( 'actionthrottledtext' );
3103                 }
3104                 # If there were errors, bail out now
3105                 if ( !empty( $errors ) )
3106                         return $errors;
3107
3108                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3109         }
3110
3111         /**
3112          * Backend implementation of doRollback(), please refer there for parameter
3113          * and return value documentation
3114          *
3115          * NOTE: This function does NOT check ANY permissions, it just commits the
3116          * rollback to the DB Therefore, you should only call this function direct-
3117          * ly if you want to use custom permissions checks. If you don't, use
3118          * doRollback() instead.
3119          */
3120         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3121                 global $wgUseRCPatrol, $wgUser, $wgLang;
3122                 $dbw = wfGetDB( DB_MASTER );
3123
3124                 if ( wfReadOnly() ) {
3125                         return array( array( 'readonlytext' ) );
3126                 }
3127
3128                 # Get the last editor
3129                 $current = Revision::newFromTitle( $this->mTitle );
3130                 if ( is_null( $current ) ) {
3131                         # Something wrong... no page?
3132                         return array( array( 'notanarticle' ) );
3133                 }
3134
3135                 $from = str_replace( '_', ' ', $fromP );
3136                 # User name given should match up with the top revision.
3137                 # If the user was deleted then $from should be empty.
3138                 if ( $from != $current->getUserText() ) {
3139                         $resultDetails = array( 'current' => $current );
3140                         return array( array( 'alreadyrolled',
3141                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3142                                 htmlspecialchars( $fromP ),
3143                                 htmlspecialchars( $current->getUserText() )
3144                         ) );
3145                 }
3146
3147                 # Get the last edit not by this guy...
3148                 # Note: these may not be public values
3149                 $user = intval( $current->getRawUser() );
3150                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3151                 $s = $dbw->selectRow( 'revision',
3152                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3153                         array( 'rev_page' => $current->getPage(),
3154                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3155                         ), __METHOD__,
3156                         array( 'USE INDEX' => 'page_timestamp',
3157                                 'ORDER BY'  => 'rev_timestamp DESC' )
3158                         );
3159                 if ( $s === false ) {
3160                         # No one else ever edited this page
3161                         return array( array( 'cantrollback' ) );
3162                 } else if ( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3163                         # Only admins can see this text
3164                         return array( array( 'notvisiblerev' ) );
3165                 }
3166
3167                 $set = array();
3168                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3169                         # Mark all reverted edits as bot
3170                         $set['rc_bot'] = 1;
3171                 }
3172                 if ( $wgUseRCPatrol ) {
3173                         # Mark all reverted edits as patrolled
3174                         $set['rc_patrolled'] = 1;
3175                 }
3176
3177                 if ( count( $set ) ) {
3178                         $dbw->update( 'recentchanges', $set,
3179                                 array( /* WHERE */
3180                                         'rc_cur_id' => $current->getPage(),
3181                                         'rc_user_text' => $current->getUserText(),
3182                                         "rc_timestamp > '{$s->rev_timestamp}'",
3183                                 ), __METHOD__
3184                         );
3185                 }
3186
3187                 # Generate the edit summary if necessary
3188                 $target = Revision::newFromId( $s->rev_id );
3189                 if ( empty( $summary ) ) {
3190                         if ( $from == '' ) { // no public user name
3191                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3192                         } else {
3193                                 $summary = wfMsgForContent( 'revertpage' );
3194                         }
3195                 }
3196
3197                 # Allow the custom summary to use the same args as the default message
3198                 $args = array(
3199                         $target->getUserText(), $from, $s->rev_id,
3200                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3201                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3202                 );
3203                 $summary = wfMsgReplaceArgs( $summary, $args );
3204
3205                 # Save
3206                 $flags = EDIT_UPDATE;
3207
3208                 if ( $wgUser->isAllowed( 'minoredit' ) )
3209                         $flags |= EDIT_MINOR;
3210
3211                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) )
3212                         $flags |= EDIT_FORCE_BOT;
3213                 # Actually store the edit
3214                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3215                 if ( !empty( $status->value['revision'] ) ) {
3216                         $revId = $status->value['revision']->getId();
3217                 } else {
3218                         $revId = false;
3219                 }
3220
3221                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3222
3223                 $resultDetails = array(
3224                         'summary' => $summary,
3225                         'current' => $current,
3226                         'target'  => $target,
3227                         'newid'   => $revId
3228                 );
3229                 return array();
3230         }
3231
3232         /**
3233          * User interface for rollback operations
3234          */
3235         public function rollback() {
3236                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3237                 $details = null;
3238
3239                 $result = $this->doRollback(
3240                         $wgRequest->getVal( 'from' ),
3241                         $wgRequest->getText( 'summary' ),
3242                         $wgRequest->getVal( 'token' ),
3243                         $wgRequest->getBool( 'bot' ),
3244                         $details
3245                 );
3246
3247                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3248                         $wgOut->rateLimited();
3249                         return;
3250                 }
3251                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3252                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3253                         $errArray = $result[0];
3254                         $errMsg = array_shift( $errArray );
3255                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3256                         if ( isset( $details['current'] ) ) {
3257                                 $current = $details['current'];
3258                                 if ( $current->getComment() != '' ) {
3259                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3260                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3261                                 }
3262                         }
3263                         return;
3264                 }
3265                 # Display permissions errors before read-only message -- there's no
3266                 # point in misleading the user into thinking the inability to rollback
3267                 # is only temporary.
3268                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3269                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3270                         # move any 'readonlytext' error manually.
3271                         $out = array();
3272                         foreach ( $result as $error ) {
3273                                 if ( $error != array( 'readonlytext' ) ) {
3274                                         $out [] = $error;
3275                                 }
3276                         }
3277                         $wgOut->showPermissionsErrorPage( $out );
3278                         return;
3279                 }
3280                 if ( $result == array( array( 'readonlytext' ) ) ) {
3281                         $wgOut->readOnlyPage();
3282                         return;
3283                 }
3284
3285                 $current = $details['current'];
3286                 $target = $details['target'];
3287                 $newId = $details['newid'];
3288                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3289                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3290                 if ( $current->getUserText() === '' ) {
3291                         $old = wfMsg( 'rev-deleted-user' );
3292                 } else {
3293                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3294                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3295                 }
3296                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3297                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3298                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3299                 $wgOut->returnToMain( false, $this->mTitle );
3300
3301                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3302                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3303                         $de->showDiff( '', '' );
3304                 }
3305         }
3306
3307
3308         /**
3309          * Do standard deferred updates after page view
3310          */
3311         public function viewUpdates() {
3312                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3313                 if ( wfReadOnly() ) {
3314                         return;
3315                 }
3316                 # Don't update page view counters on views from bot users (bug 14044)
3317                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3318                         Article::incViewCount( $this->getID() );
3319                         $u = new SiteStatsUpdate( 1, 0, 0 );
3320                         array_push( $wgDeferredUpdateList, $u );
3321                 }
3322                 # Update newtalk / watchlist notification status
3323                 $wgUser->clearNotification( $this->mTitle );
3324         }
3325
3326         /**
3327          * Prepare text which is about to be saved.
3328          * Returns a stdclass with source, pst and output members
3329          */
3330         public function prepareTextForEdit( $text, $revid = null ) {
3331                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3332                         // Already prepared
3333                         return $this->mPreparedEdit;
3334                 }
3335                 global $wgParser;
3336                 $edit = (object)array();
3337                 $edit->revid = $revid;
3338                 $edit->newText = $text;
3339                 $edit->pst = $this->preSaveTransform( $text );
3340                 $options = $this->getParserOptions();
3341                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3342                 $edit->oldText = $this->getContent();
3343                 $this->mPreparedEdit = $edit;
3344                 return $edit;
3345         }
3346
3347         /**
3348          * Do standard deferred updates after page edit.
3349          * Update links tables, site stats, search index and message cache.
3350          * Purges pages that include this page if the text was changed here.
3351          * Every 100th edit, prune the recent changes table.
3352          *
3353          * @private
3354          * @param $text New text of the article
3355          * @param $summary Edit summary
3356          * @param $minoredit Minor edit
3357          * @param $timestamp_of_pagechange Timestamp associated with the page change
3358          * @param $newid rev_id value of the new revision
3359          * @param $changed Whether or not the content actually changed
3360          */
3361         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3362                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3363
3364                 wfProfileIn( __METHOD__ );
3365
3366                 # Parse the text
3367                 # Be careful not to double-PST: $text is usually already PST-ed once
3368                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3369                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3370                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3371                 } else {
3372                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3373                         $editInfo = $this->mPreparedEdit;
3374                 }
3375
3376                 # Save it to the parser cache
3377                 if ( $wgEnableParserCache ) {
3378                         $popts = $this->getParserOptions();
3379                         $parserCache = ParserCache::singleton();
3380                         $parserCache->save( $editInfo->output, $this, $popts );
3381                 }
3382
3383                 # Update the links tables
3384                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3385                 $u->doUpdate();
3386
3387                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3388
3389                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3390                         if ( 0 == mt_rand( 0, 99 ) ) {
3391                                 // Flush old entries from the `recentchanges` table; we do this on
3392                                 // random requests so as to avoid an increase in writes for no good reason
3393                                 global $wgRCMaxAge;
3394                                 $dbw = wfGetDB( DB_MASTER );
3395                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3396                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3397                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3398                                 $dbw->query( $sql );
3399                         }
3400                 }
3401
3402                 $id = $this->getID();
3403                 $title = $this->mTitle->getPrefixedDBkey();
3404                 $shortTitle = $this->mTitle->getDBkey();
3405
3406                 if ( 0 == $id ) {
3407                         wfProfileOut( __METHOD__ );
3408                         return;
3409                 }
3410
3411                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3412                 array_push( $wgDeferredUpdateList, $u );
3413                 $u = new SearchUpdate( $id, $title, $text );
3414                 array_push( $wgDeferredUpdateList, $u );
3415
3416                 # If this is another user's talk page, update newtalk
3417                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3418                 # load of user talk pages and piss people off, nor if it's a minor edit
3419                 # by a properly-flagged bot.
3420                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3421                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3422                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3423                                 $other = User::newFromName( $shortTitle, false );
3424                                 if ( !$other ) {
3425                                         wfDebug( __METHOD__ . ": invalid username\n" );
3426                                 } elseif ( User::isIP( $shortTitle ) ) {
3427                                         // An anonymous user
3428                                         $other->setNewtalk( true );
3429                                 } elseif ( $other->isLoggedIn() ) {
3430                                         $other->setNewtalk( true );
3431                                 } else {
3432                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3433                                 }
3434                         }
3435                 }
3436
3437                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3438                         $wgMessageCache->replace( $shortTitle, $text );
3439                 }
3440
3441                 wfProfileOut( __METHOD__ );
3442         }
3443
3444         /**
3445          * Perform article updates on a special page creation.
3446          *
3447          * @param $rev Revision object
3448          *
3449          * @todo This is a shitty interface function. Kill it and replace the
3450          * other shitty functions like editUpdates and such so it's not needed
3451          * anymore.
3452          */
3453         public function createUpdates( $rev ) {
3454                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3455                 $this->mTotalAdjustment = 1;
3456                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3457                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3458         }
3459
3460         /**
3461          * Generate the navigation links when browsing through an article revisions
3462          * It shows the information as:
3463          *   Revision as of \<date\>; view current revision
3464          *   \<- Previous version | Next Version -\>
3465          *
3466          * @param $oldid String: revision ID of this article revision
3467          */
3468         public function setOldSubtitle( $oldid = 0 ) {
3469                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3470
3471                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3472                         return;
3473                 }
3474
3475                 $unhide = $wgRequest->getInt( 'unhide' ) == 1 &&
3476                         $wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $oldid );
3477                 # Cascade unhide param in links for easy deletion browsing
3478                 $extraParams = array();
3479                 if ( $wgRequest->getVal( 'unhide' ) ) {
3480                         $extraParams['unhide'] = 1;
3481                 }
3482                 $revision = Revision::newFromId( $oldid );
3483
3484                 $current = ( $oldid == $this->mLatest );
3485                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3486                 $tddate = $wgLang->date( $this->mTimestamp, true );
3487                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3488                 $sk = $wgUser->getSkin();
3489                 $lnk = $current
3490                         ? wfMsgHtml( 'currentrevisionlink' )
3491                         : $sk->link(
3492                                 $this->mTitle,
3493                                 wfMsgHtml( 'currentrevisionlink' ),
3494                                 array(),
3495                                 $extraParams,
3496                                 array( 'known', 'noclasses' )
3497                         );
3498                 $curdiff = $current
3499                         ? wfMsgHtml( 'diff' )
3500                         : $sk->link(
3501                                 $this->mTitle,
3502                                 wfMsgHtml( 'diff' ),
3503                                 array(),
3504                                 array(
3505                                         'diff' => 'cur',
3506                                         'oldid' => $oldid
3507                                 ) + $extraParams,
3508                                 array( 'known', 'noclasses' )
3509                         );
3510                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3511                 $prevlink = $prev
3512                         ? $sk->link(
3513                                 $this->mTitle,
3514                                 wfMsgHtml( 'previousrevision' ),
3515                                 array(),
3516                                 array(
3517                                         'direction' => 'prev',
3518                                         'oldid' => $oldid
3519                                 ) + $extraParams,
3520                                 array( 'known', 'noclasses' )
3521                         )
3522                         : wfMsgHtml( 'previousrevision' );
3523                 $prevdiff = $prev
3524                         ? $sk->link(
3525                                 $this->mTitle,
3526                                 wfMsgHtml( 'diff' ),
3527                                 array(),
3528                                 array(
3529                                         'diff' => 'prev',
3530                                         'oldid' => $oldid
3531                                 ) + $extraParams,
3532                                 array( 'known', 'noclasses' )
3533                         )
3534                         : wfMsgHtml( 'diff' );
3535                 $nextlink = $current
3536                         ? wfMsgHtml( 'nextrevision' )
3537                         : $sk->link(
3538                                 $this->mTitle,
3539                                 wfMsgHtml( 'nextrevision' ),
3540                                 array(),
3541                                 array(
3542                                         'direction' => 'next',
3543                                         'oldid' => $oldid
3544                                 ) + $extraParams,
3545                                 array( 'known', 'noclasses' )
3546                         );
3547                 $nextdiff = $current
3548                         ? wfMsgHtml( 'diff' )
3549                         : $sk->link(
3550                                 $this->mTitle,
3551                                 wfMsgHtml( 'diff' ),
3552                                 array(),
3553                                 array(
3554                                         'diff' => 'next',
3555                                         'oldid' => $oldid
3556                                 ) + $extraParams,
3557                                 array( 'known', 'noclasses' )
3558                         );
3559
3560                 $cdel = '';
3561                 // User can delete revisions or view deleted revisions...
3562                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3563                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3564                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3565                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3566                         } else {
3567                                 $query = array(
3568                                         'type'   => 'revision',
3569                                         'target' => $this->mTitle->getPrefixedDbkey(),
3570                                         'ids'    => $oldid
3571                                 );
3572                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3573                         }
3574                         $cdel .= ' ';
3575                 }
3576
3577                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3578                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3579
3580                 $m = wfMsg( 'revision-info-current' );
3581                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3582                         ? 'revision-info-current'
3583                         : 'revision-info';
3584
3585                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3586                         wfMsgExt(
3587                                 $infomsg,
3588                                 array( 'parseinline', 'replaceafter' ),
3589                                 $td,
3590                                 $userlinks,
3591                                 $revision->getID(),
3592                                 $tddate,
3593                                 $tdtime,
3594                                 $revision->getUser()
3595                         ) .
3596                         "</div>\n" .
3597                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3598                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3599                 $wgOut->setSubtitle( $r );
3600         }
3601
3602         /**
3603          * This function is called right before saving the wikitext,
3604          * so we can do things like signatures and links-in-context.
3605          *
3606          * @param $text String article contents
3607          * @return string article contents with altered wikitext markup (signatures
3608          *      converted, {{subst:}}, templates, etc.)
3609          */
3610         public function preSaveTransform( $text ) {
3611                 global $wgParser, $wgUser;
3612                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3613         }
3614
3615         /* Caching functions */
3616
3617         /**
3618          * checkLastModified returns true if it has taken care of all
3619          * output to the client that is necessary for this request.
3620          * (that is, it has sent a cached version of the page)
3621          *
3622          * @return boolean true if cached version send, false otherwise
3623          */
3624         protected function tryFileCache() {
3625                 static $called = false;
3626                 if ( $called ) {
3627                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3628                         return false;
3629                 }
3630                 $called = true;
3631                 if ( $this->isFileCacheable() ) {
3632                         $cache = new HTMLFileCache( $this->mTitle );
3633                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3634                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3635                                 $cache->loadFromFileCache();
3636                                 return true;
3637                         } else {
3638                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3639                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3640                         }
3641                 } else {
3642                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3643                 }
3644                 return false;
3645         }
3646
3647         /**
3648          * Check if the page can be cached
3649          * @return bool
3650          */
3651         public function isFileCacheable() {
3652                 $cacheable = false;
3653                 if ( HTMLFileCache::useFileCache() ) {
3654                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3655                         // Extension may have reason to disable file caching on some pages.
3656                         if ( $cacheable ) {
3657                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3658                         }
3659                 }
3660                 return $cacheable;
3661         }
3662
3663         /**
3664          * Loads page_touched and returns a value indicating if it should be used
3665          * @return boolean true if not a redirect
3666          */
3667         public function checkTouched() {
3668                 if ( !$this->mDataLoaded ) {
3669                         $this->loadPageData();
3670                 }
3671                 return !$this->mIsRedirect;
3672         }
3673
3674         /**
3675          * Get the page_touched field
3676          * @return string containing GMT timestamp
3677          */
3678         public function getTouched() {
3679                 # Ensure that page data has been loaded
3680                 if ( !$this->mDataLoaded ) {
3681                         $this->loadPageData();
3682                 }
3683                 return $this->mTouched;
3684         }
3685
3686         /**
3687          * Get the page_latest field
3688          * @return integer rev_id of current revision
3689          */
3690         public function getLatest() {
3691                 if ( !$this->mDataLoaded ) {
3692                         $this->loadPageData();
3693                 }
3694                 return (int)$this->mLatest;
3695         }
3696
3697         /**
3698          * Edit an article without doing all that other stuff
3699          * The article must already exist; link tables etc
3700          * are not updated, caches are not flushed.
3701          *
3702          * @param $text String: text submitted
3703          * @param $comment String: comment submitted
3704          * @param $minor Boolean: whereas it's a minor modification
3705          */
3706         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3707                 wfProfileIn( __METHOD__ );
3708
3709                 $dbw = wfGetDB( DB_MASTER );
3710                 $revision = new Revision( array(
3711                         'page'       => $this->getId(),
3712                         'text'       => $text,
3713                         'comment'    => $comment,
3714                         'minor_edit' => $minor ? 1 : 0,
3715                         ) );
3716                 $revision->insertOn( $dbw );
3717                 $this->updateRevisionOn( $dbw, $revision );
3718
3719                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3720
3721                 wfProfileOut( __METHOD__ );
3722         }
3723
3724         /**
3725          * Used to increment the view counter
3726          *
3727          * @param $id Integer: article id
3728          */
3729         public static function incViewCount( $id ) {
3730                 $id = intval( $id );
3731                 global $wgHitcounterUpdateFreq;
3732
3733                 $dbw = wfGetDB( DB_MASTER );
3734                 $pageTable = $dbw->tableName( 'page' );
3735                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3736                 $acchitsTable = $dbw->tableName( 'acchits' );
3737
3738                 if ( $wgHitcounterUpdateFreq <= 1 ) {
3739                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3740                         return;
3741                 }
3742
3743                 # Not important enough to warrant an error page in case of failure
3744                 $oldignore = $dbw->ignoreErrors( true );
3745
3746                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3747
3748                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
3749                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
3750                         # Most of the time (or on SQL errors), skip row count check
3751                         $dbw->ignoreErrors( $oldignore );
3752                         return;
3753                 }
3754
3755                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
3756                 $row = $dbw->fetchObject( $res );
3757                 $rown = intval( $row->n );
3758                 if ( $rown >= $wgHitcounterUpdateFreq ) {
3759                         wfProfileIn( 'Article::incViewCount-collect' );
3760                         $old_user_abort = ignore_user_abort( true );
3761
3762                         $dbType = $dbw->getType();
3763                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
3764                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
3765                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
3766                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
3767                                 'GROUP BY hc_id', __METHOD__ );
3768                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
3769                         $dbw->unlockTables( __METHOD__ );
3770                         if ( $dbType == 'mysql' ) {
3771                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
3772                                         'WHERE page_id = hc_id', __METHOD__ );
3773                         }
3774                         else {
3775                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
3776                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
3777                         }
3778                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
3779
3780                         ignore_user_abort( $old_user_abort );
3781                         wfProfileOut( 'Article::incViewCount-collect' );
3782                 }
3783                 $dbw->ignoreErrors( $oldignore );
3784         }
3785
3786         /**#@+
3787          * The onArticle*() functions are supposed to be a kind of hooks
3788          * which should be called whenever any of the specified actions
3789          * are done.
3790          *
3791          * This is a good place to put code to clear caches, for instance.
3792          *
3793          * This is called on page move and undelete, as well as edit
3794          *
3795          * @param $title a title object
3796          */
3797         public static function onArticleCreate( $title ) {
3798                 # Update existence markers on article/talk tabs...
3799                 if ( $title->isTalkPage() ) {
3800                         $other = $title->getSubjectPage();
3801                 } else {
3802                         $other = $title->getTalkPage();
3803                 }
3804                 $other->invalidateCache();
3805                 $other->purgeSquid();
3806
3807                 $title->touchLinks();
3808                 $title->purgeSquid();
3809                 $title->deleteTitleProtection();
3810         }
3811
3812         /**
3813          * Clears caches when article is deleted
3814          */
3815         public static function onArticleDelete( $title ) {
3816                 global $wgMessageCache;
3817                 # Update existence markers on article/talk tabs...
3818                 if ( $title->isTalkPage() ) {
3819                         $other = $title->getSubjectPage();
3820                 } else {
3821                         $other = $title->getTalkPage();
3822                 }
3823                 $other->invalidateCache();
3824                 $other->purgeSquid();
3825
3826                 $title->touchLinks();
3827                 $title->purgeSquid();
3828
3829                 # File cache
3830                 HTMLFileCache::clearFileCache( $title );
3831
3832                 # Messages
3833                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3834                         $wgMessageCache->replace( $title->getDBkey(), false );
3835                 }
3836                 # Images
3837                 if ( $title->getNamespace() == NS_FILE ) {
3838                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3839                         $update->doUpdate();
3840                 }
3841                 # User talk pages
3842                 if ( $title->getNamespace() == NS_USER_TALK ) {
3843                         $user = User::newFromName( $title->getText(), false );
3844                         $user->setNewtalk( false );
3845                 }
3846                 # Image redirects
3847                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3848         }
3849
3850         /**
3851          * Purge caches on page update etc
3852          *
3853          * @param $title Title object
3854          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3855          */
3856         public static function onArticleEdit( $title ) {
3857                 global $wgDeferredUpdateList;
3858
3859                 // Invalidate caches of articles which include this page
3860                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3861
3862                 // Invalidate the caches of all pages which redirect here
3863                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3864
3865                 # Purge squid for this page only
3866                 $title->purgeSquid();
3867
3868                 # Clear file cache for this page only
3869                 HTMLFileCache::clearFileCache( $title );
3870         }
3871
3872         /**#@-*/
3873
3874         /**
3875          * Overriden by ImagePage class, only present here to avoid a fatal error
3876          * Called for ?action=revert
3877          */
3878         public function revert() {
3879                 global $wgOut;
3880                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3881         }
3882
3883         /**
3884          * Info about this page
3885          * Called for ?action=info when $wgAllowPageInfo is on.
3886          */
3887         public function info() {
3888                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3889
3890                 if ( !$wgAllowPageInfo ) {
3891                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3892                         return;
3893                 }
3894
3895                 $page = $this->mTitle->getSubjectPage();
3896
3897                 $wgOut->setPagetitle( $page->getPrefixedText() );
3898                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3899                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3900
3901                 if ( !$this->mTitle->exists() ) {
3902                         $wgOut->addHTML( '<div class="noarticletext">' );
3903                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3904                                 // This doesn't quite make sense; the user is asking for
3905                                 // information about the _page_, not the message... -- RC
3906                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3907                         } else {
3908                                 $msg = $wgUser->isLoggedIn()
3909                                         ? 'noarticletext'
3910                                         : 'noarticletextanon';
3911                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3912                         }
3913                         $wgOut->addHTML( '</div>' );
3914                 } else {
3915                         $dbr = wfGetDB( DB_SLAVE );
3916                         $wl_clause = array(
3917                                 'wl_title'     => $page->getDBkey(),
3918                                 'wl_namespace' => $page->getNamespace() );
3919                         $numwatchers = $dbr->selectField(
3920                                 'watchlist',
3921                                 'COUNT(*)',
3922                                 $wl_clause,
3923                                 __METHOD__,
3924                                 $this->getSelectOptions() );
3925
3926                         $pageInfo = $this->pageCountInfo( $page );
3927                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3928
3929                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3930                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
3931                         if ( $talkInfo ) {
3932                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
3933                         }
3934                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3935                         if ( $talkInfo ) {
3936                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3937                         }
3938                         $wgOut->addHTML( '</ul>' );
3939                 }
3940         }
3941
3942         /**
3943          * Return the total number of edits and number of unique editors
3944          * on a given page. If page does not exist, returns false.
3945          *
3946          * @param $title Title object
3947          * @return mixed array or boolean false
3948          */
3949         public function pageCountInfo( $title ) {
3950                 $id = $title->getArticleId();
3951                 if ( $id == 0 ) {
3952                         return false;
3953                 }
3954                 $dbr = wfGetDB( DB_SLAVE );
3955                 $rev_clause = array( 'rev_page' => $id );
3956                 $edits = $dbr->selectField(
3957                         'revision',
3958                         'COUNT(rev_page)',
3959                         $rev_clause,
3960                         __METHOD__,
3961                         $this->getSelectOptions()
3962                 );
3963                 $authors = $dbr->selectField(
3964                         'revision',
3965                         'COUNT(DISTINCT rev_user_text)',
3966                         $rev_clause,
3967                         __METHOD__,
3968                         $this->getSelectOptions()
3969                 );
3970                 return array( 'edits' => $edits, 'authors' => $authors );
3971         }
3972
3973         /**
3974          * Return a list of templates used by this article.
3975          * Uses the templatelinks table
3976          *
3977          * @return Array of Title objects
3978          */
3979         public function getUsedTemplates() {
3980                 $result = array();
3981                 $id = $this->mTitle->getArticleID();
3982                 if ( $id == 0 ) {
3983                         return array();
3984                 }
3985                 $dbr = wfGetDB( DB_SLAVE );
3986                 $res = $dbr->select( array( 'templatelinks' ),
3987                         array( 'tl_namespace', 'tl_title' ),
3988                         array( 'tl_from' => $id ),
3989                         __METHOD__ );
3990                 if ( $res !== false ) {
3991                         foreach ( $res as $row ) {
3992                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3993                         }
3994                 }
3995                 $dbr->freeResult( $res );
3996                 return $result;
3997         }
3998
3999         /**
4000          * Returns a list of hidden categories this page is a member of.
4001          * Uses the page_props and categorylinks tables.
4002          *
4003          * @return Array of Title objects
4004          */
4005         public function getHiddenCategories() {
4006                 $result = array();
4007                 $id = $this->mTitle->getArticleID();
4008                 if ( $id == 0 ) {
4009                         return array();
4010                 }
4011                 $dbr = wfGetDB( DB_SLAVE );
4012                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4013                         array( 'cl_to' ),
4014                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4015                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4016                         __METHOD__ );
4017                 if ( $res !== false ) {
4018                         foreach ( $res as $row ) {
4019                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4020                         }
4021                 }
4022                 $dbr->freeResult( $res );
4023                 return $result;
4024         }
4025
4026         /**
4027         * Return an applicable autosummary if one exists for the given edit.
4028         * @param $oldtext String: the previous text of the page.
4029         * @param $newtext String: The submitted text of the page.
4030         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4031         * @return string An appropriate autosummary, or an empty string.
4032         */
4033         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4034                 # Decide what kind of autosummary is needed.
4035
4036                 # Redirect autosummaries
4037                 $ot = Title::newFromRedirect( $oldtext );
4038                 $rt = Title::newFromRedirect( $newtext );
4039                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4040                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4041                 }
4042
4043                 # New page autosummaries
4044                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4045                         # If they're making a new article, give its text, truncated, in the summary.
4046                         global $wgContLang;
4047                         $truncatedtext = $wgContLang->truncate(
4048                                 str_replace( "\n", ' ', $newtext ),
4049                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4050                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4051                 }
4052
4053                 # Blanking autosummaries
4054                 if ( $oldtext != '' && $newtext == '' ) {
4055                         return wfMsgForContent( 'autosumm-blank' );
4056                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4057                         # Removing more than 90% of the article
4058                         global $wgContLang;
4059                         $truncatedtext = $wgContLang->truncate(
4060                                 $newtext,
4061                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4062                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4063                 }
4064
4065                 # If we reach this point, there's no applicable autosummary for our case, so our
4066                 # autosummary is empty.
4067                 return '';
4068         }
4069
4070         /**
4071          * Add the primary page-view wikitext to the output buffer
4072          * Saves the text into the parser cache if possible.
4073          * Updates templatelinks if it is out of date.
4074          *
4075          * @param $text String
4076          * @param $cache Boolean
4077          * @param $parserOptions mixed ParserOptions object, or boolean false
4078          */
4079         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4080                 global $wgOut;
4081
4082                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4083                 $wgOut->addParserOutput( $this->mParserOutput );
4084         }
4085
4086         /**
4087          * This does all the heavy lifting for outputWikitext, except it returns the parser
4088          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4089          * say, embedding thread pages within a discussion system (LiquidThreads)
4090          *
4091          * @param $text string
4092          * @param $cache boolean
4093          * @param $parserOptions parsing options, defaults to false
4094          * @return string containing parsed output
4095          */
4096         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4097                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
4098
4099                 if ( !$parserOptions ) {
4100                         $parserOptions = $this->getParserOptions();
4101                 }
4102
4103                 $time = - wfTime();
4104                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4105                         $parserOptions, true, true, $this->getRevIdFetched() );
4106                 $time += wfTime();
4107
4108                 # Timing hack
4109                 if ( $time > 3 ) {
4110                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4111                                 $this->mTitle->getPrefixedDBkey() ) );
4112                 }
4113
4114                 if ( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
4115                         $parserCache = ParserCache::singleton();
4116                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4117                 }
4118                 // Make sure file cache is not used on uncacheable content.
4119                 // Output that has magic words in it can still use the parser cache
4120                 // (if enabled), though it will generally expire sooner.
4121                 if ( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
4122                         $wgUseFileCache = false;
4123                 }
4124                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4125                 return $this->mParserOutput;
4126         }
4127
4128         /**
4129          * Get parser options suitable for rendering the primary article wikitext
4130          * @return mixed ParserOptions object or boolean false
4131          */
4132         public function getParserOptions() {
4133                 global $wgUser;
4134                 if ( !$this->mParserOptions ) {
4135                         $this->mParserOptions = new ParserOptions( $wgUser );
4136                         $this->mParserOptions->setTidy( true );
4137                         $this->mParserOptions->enableLimitReport();
4138                 }
4139                 return $this->mParserOptions;
4140         }
4141
4142         /**
4143          * Updates cascading protections
4144          *
4145          * @param $parserOutput mixed ParserOptions object, or boolean false
4146          **/
4147
4148         protected function doCascadeProtectionUpdates( $parserOutput ) {
4149                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4150                         return;
4151                 }
4152
4153                 // templatelinks table may have become out of sync,
4154                 // especially if using variable-based transclusions.
4155                 // For paranoia, check if things have changed and if
4156                 // so apply updates to the database. This will ensure
4157                 // that cascaded protections apply as soon as the changes
4158                 // are visible.
4159
4160                 # Get templates from templatelinks
4161                 $id = $this->mTitle->getArticleID();
4162
4163                 $tlTemplates = array();
4164
4165                 $dbr = wfGetDB( DB_SLAVE );
4166                 $res = $dbr->select( array( 'templatelinks' ),
4167                         array( 'tl_namespace', 'tl_title' ),
4168                         array( 'tl_from' => $id ),
4169                         __METHOD__ );
4170
4171                 global $wgContLang;
4172                 foreach ( $res as $row ) {
4173                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4174                 }
4175
4176                 # Get templates from parser output.
4177                 $poTemplates = array();
4178                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4179                         foreach ( $templates as $dbk => $id ) {
4180                                 $poTemplates["$ns:$dbk"] = true;
4181                         }
4182                 }
4183
4184                 # Get the diff
4185                 # Note that we simulate array_diff_key in PHP <5.0.x
4186                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4187
4188                 if ( count( $templates_diff ) > 0 ) {
4189                         # Whee, link updates time.
4190                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4191                         $u->doUpdate();
4192                 }
4193         }
4194
4195         /**
4196          * Update all the appropriate counts in the category table, given that
4197          * we've added the categories $added and deleted the categories $deleted.
4198          *
4199          * @param $added array   The names of categories that were added
4200          * @param $deleted array The names of categories that were deleted
4201          */
4202         public function updateCategoryCounts( $added, $deleted ) {
4203                 $ns = $this->mTitle->getNamespace();
4204                 $dbw = wfGetDB( DB_MASTER );
4205
4206                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4207                 # exist, we might legitimately not create it, but it's simpler to just
4208                 # create it and then give it a negative value, since the value is bogus
4209                 # anyway.
4210                 #
4211                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4212                 $insertCats = array_merge( $added, $deleted );
4213                 if ( !$insertCats ) {
4214                         # Okay, nothing to do
4215                         return;
4216                 }
4217                 $insertRows = array();
4218                 foreach ( $insertCats as $cat ) {
4219                         $insertRows[] = array(
4220                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4221                                 'cat_title' => $cat
4222                         );
4223                 }
4224                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4225
4226                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4227                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4228                 if ( $ns == NS_CATEGORY ) {
4229                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4230                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4231                 } elseif ( $ns == NS_FILE ) {
4232                         $addFields[]    = 'cat_files = cat_files + 1';
4233                         $removeFields[] = 'cat_files = cat_files - 1';
4234                 }
4235
4236                 if ( $added ) {
4237                         $dbw->update(
4238                                 'category',
4239                                 $addFields,
4240                                 array( 'cat_title' => $added ),
4241                                 __METHOD__
4242                         );
4243                 }
4244                 if ( $deleted ) {
4245                         $dbw->update(
4246                                 'category',
4247                                 $removeFields,
4248                                 array( 'cat_title' => $deleted ),
4249                                 __METHOD__
4250                         );
4251                 }
4252         }
4253
4254         /**
4255          * Lightweight method to get the parser output for a page, checking the parser cache
4256          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4257          * consider, so it's not appropriate to use there.
4258          *
4259          * @param $oldid mixed integer Revision ID or null
4260          */
4261         public function getParserOutput( $oldid = null ) {
4262                 global $wgEnableParserCache, $wgUser, $wgOut;
4263
4264                 // Should the parser cache be used?
4265                 $useParserCache = $wgEnableParserCache &&
4266                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4267                           $this->exists() &&
4268                           $oldid === null;
4269
4270                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4271                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4272                         wfIncrStats( 'pcache_miss_stub' );
4273                 }
4274
4275                 $parserOutput = false;
4276                 if ( $useParserCache ) {
4277                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4278                 }
4279
4280                 if ( $parserOutput === false ) {
4281                         // Cache miss; parse and output it.
4282                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4283
4284                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4285                 } else {
4286                         return $parserOutput;
4287                 }
4288         }
4289 }