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 $mDataLoaded = false;         // !<
  25         var $mForUpdate = false;          // !<
  26         var $mGoodAdjustment = 0;         // !<
  27         var $mIsRedirect = false;         // !<
  28         var $mLatest = false;             // !<
  29         var $mMinorEdit;                  // !<
  30         var $mOldId;                      // !<
  31         var $mPreparedEdit = false;       // !< Title object if set
  32         var $mRedirectedFrom = null;      // !< Title object if set
  33         var $mRedirectTarget = null;      // !< Title object if set
  34         var $mRedirectUrl = false;        // !<
  35         var $mRevIdFetched = 0;           // !<
  36         var $mRevision = null;            // !< Revision object if set
  37         var $mTimestamp = '';             // !<
  38         var $mTitle;                      // !< Title object
  39         var $mTotalAdjustment = 0;        // !<
  40         var $mTouched = '19700101000000'; // !<
  41         var $mUser = -1;                  // !< Not loaded
  42         var $mUserText = '';              // !< username from Revision if set
  43         var $mParserOptions;              // !< ParserOptions object for $wgUser articles
  44         var $mParserOutput;               // !< ParserCache object if set
  45         /**@}}*/
  46
  47         /**
  48          * Constructor and clear the article
  49          * @param $title Reference to a Title object.
  50          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  51          */
  52         public function __construct( Title $title, $oldId = null ) {
  53                 // FIXME: does the reference play any role here?
  54                 $this->mTitle =& $title;
  55                 $this->mOldId = $oldId;
  56         }
  57
  58         /**
  59          * Constructor from an page id
  60          * @param $id Int 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->isRedirect() ) {
  87                         return null;
  88                 }
  89
  90                 if ( $this->mRedirectTarget !== null ) {
  91                         return $this->mRedirectTarget;
  92                 }
  93
  94                 # Query the redirect table
  95                 $dbr = wfGetDB( DB_SLAVE );
  96                 $row = $dbr->selectRow( 'redirect',
  97                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  98                         array( 'rd_from' => $this->getID() ),
  99                         __METHOD__
 100                 );
 101
 102                 // rd_fragment and rd_interwiki were added later, populate them if empty
 103                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 104                         return $this->mRedirectTarget = Title::makeTitle(
 105                                 $row->rd_namespace, $row->rd_title,
 106                                 $row->rd_fragment, $row->rd_interwiki );
 107                 }
 108
 109                 # This page doesn't have an entry in the redirect table
 110                 return $this->mRedirectTarget = $this->insertRedirect();
 111         }
 112
 113         /**
 114          * Insert an entry for this page into the redirect table.
 115          *
 116          * Don't call this function directly unless you know what you're doing.
 117          * @return Title object or null if not a redirect
 118          */
 119         public function insertRedirect() {
 120                 // recurse through to only get the final target
 121                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 122                 if ( !$retval ) {
 123                         return null;
 124                 }
 125                 $this->insertRedirectEntry( $retval );
 126                 return $retval;
 127         }
 128
 129         /**
 130          * Insert or update the redirect table entry for this page to indicate
 131          * it redirects to $rt .
 132          * @param $rt Title redirect target
 133          */
 134         public function insertRedirectEntry( $rt ) {
 135                 $dbw = wfGetDB( DB_MASTER );
 136                 $dbw->replace( 'redirect', array( 'rd_from' ),
 137                         array(
 138                                 'rd_from' => $this->getID(),
 139                                 'rd_namespace' => $rt->getNamespace(),
 140                                 'rd_title' => $rt->getDBkey(),
 141                                 'rd_fragment' => $rt->getFragment(),
 142                                 'rd_interwiki' => $rt->getInterwiki(),
 143                         ),
 144                         __METHOD__
 145                 );
 146         }
 147
 148         /**
 149          * Get the Title object or URL this page redirects to
 150          *
 151          * @return mixed false, Title of in-wiki target, or string with URL
 152          */
 153         public function followRedirect() {
 154                 return $this->getRedirectURL( $this->getRedirectTarget() );
 155         }
 156
 157         /**
 158          * Get the Title object this text redirects to
 159          *
 160          * @param $text string article content containing redirect info
 161          * @return mixed false, Title of in-wiki target, or string with URL
 162          * @deprecated @since 1.17
 163          */
 164         public function followRedirectText( $text ) {
 165                 // recurse through to only get the final target
 166                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 167         }
 168
 169         /**
 170          * Get the Title object or URL to use for a redirect. We use Title
 171          * objects for same-wiki, non-special redirects and URLs for everything
 172          * else.
 173          * @param $rt Title Redirect target
 174          * @return mixed false, Title object of local target, or string with URL
 175          */
 176         public function getRedirectURL( $rt ) {
 177                 if ( $rt ) {
 178                         if ( $rt->getInterwiki() != '' ) {
 179                                 if ( $rt->isLocal() ) {
 180                                         // Offsite wikis need an HTTP redirect.
 181                                         //
 182                                         // This can be hard to reverse and may produce loops,
 183                                         // so they may be disabled in the site configuration.
 184                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 185                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 186                                 }
 187                         } else {
 188                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 189                                         // Gotta handle redirects to special pages differently:
 190                                         // Fill the HTTP response "Location" header and ignore
 191                                         // the rest of the page we're on.
 192                                         //
 193                                         // This can be hard to reverse, so they may be disabled.
 194                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 195                                                 // rolleyes
 196                                         } else {
 197                                                 return $rt->getFullURL();
 198                                         }
 199                                 }
 200
 201                                 return $rt;
 202                         }
 203                 }
 204
 205                 // No or invalid redirect
 206                 return false;
 207         }
 208
 209         /**
 210          * Get the title object of the article
 211          * @return Title object of this page
 212          */
 213         public function getTitle() {
 214                 return $this->mTitle;
 215         }
 216
 217         /**
 218          * Clear the object
 219          * FIXME: shouldn't this be public?
 220          * @private
 221          */
 222         public function clear() {
 223                 $this->mDataLoaded    = false;
 224                 $this->mContentLoaded = false;
 225
 226                 $this->mUser = $this->mCounter = -1; # Not loaded
 227                 $this->mRedirectedFrom = null; # Title object if set
 228                 $this->mRedirectTarget = null; # Title object if set
 229                 $this->mUserText =
 230                 $this->mTimestamp = $this->mComment = '';
 231                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 232                 $this->mTouched = '19700101000000';
 233                 $this->mForUpdate = false;
 234                 $this->mIsRedirect = false;
 235                 $this->mRevIdFetched = 0;
 236                 $this->mRedirectUrl = false;
 237                 $this->mLatest = false;
 238                 $this->mPreparedEdit = false;
 239         }
 240
 241         /**
 242          * Note that getContent/loadContent do not follow redirects anymore.
 243          * If you need to fetch redirectable content easily, try
 244          * the shortcut in Article::followRedirect()
 245          *
 246          * This function has side effects! Do not use this function if you
 247          * only want the real revision text if any.
 248          *
 249          * @return Return the text of this revision
 250          */
 251         public function getContent() {
 252                 global $wgUser;
 253
 254                 wfProfileIn( __METHOD__ );
 255
 256                 if ( $this->getID() === 0 ) {
 257                         # If this is a MediaWiki:x message, then load the messages
 258                         # and return the message value for x.
 259                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 260                                 $text = $this->mTitle->getDefaultMessageText();
 261                                 if ( $text === false ) {
 262                                         $text = '';
 263                                 }
 264                         } else {
 265                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 266                         }
 267                         wfProfileOut( __METHOD__ );
 268
 269                         return $text;
 270                 } else {
 271                         $this->loadContent();
 272                         wfProfileOut( __METHOD__ );
 273
 274                         return $this->mContent;
 275                 }
 276         }
 277
 278         /**
 279          * Get the text of the current revision. No side-effects...
 280          *
 281          * @return Return the text of the current revision
 282          */
 283         public function getRawText() {
 284                 // Check process cache for current revision
 285                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 286                         return $this->mContent;
 287                 }
 288
 289                 $rev = Revision::newFromTitle( $this->mTitle );
 290                 $text = $rev ? $rev->getRawText() : false;
 291
 292                 return $text;
 293         }
 294
 295         /**
 296          * This function returns the text of a section, specified by a number ($section).
 297          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 298          * the first section before any such heading (section 0).
 299          *
 300          * If a section contains subsections, these are also returned.
 301          *
 302          * @param $text String: text to look in
 303          * @param $section Integer: section number
 304          * @return string text of the requested section
 305          * @deprecated
 306          */
 307         public function getSection( $text, $section ) {
 308                 global $wgParser;
 309                 return $wgParser->getSection( $text, $section );
 310         }
 311
 312         /**
 313          * Get the text that needs to be saved in order to undo all revisions
 314          * between $undo and $undoafter. Revisions must belong to the same page,
 315          * must exist and must not be deleted
 316          * @param $undo Revision
 317          * @param $undoafter Revision Must be an earlier revision than $undo
 318          * @return mixed string on success, false on failure
 319          */
 320         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 321                 $currentRev = Revision::newFromTitle( $this->mTitle );
 322                 if ( !$currentRev ) {
 323                         return false; // no page
 324                 }
 325                 $undo_text = $undo->getText();
 326                 $undoafter_text = $undoafter->getText();
 327                 $cur_text = $currentRev->getText();
 328
 329                 if ( $cur_text == $undo_text ) {
 330                         # No use doing a merge if it's just a straight revert.
 331                         return $undoafter_text;
 332                 }
 333
 334                 $undone_text = '';
 335
 336                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 337                         return false;
 338                 }
 339
 340                 return $undone_text;
 341         }
 342
 343         /**
 344          * @return int The oldid of the article that is to be shown, 0 for the
 345          *             current revision
 346          */
 347         public function getOldID() {
 348                 if ( is_null( $this->mOldId ) ) {
 349                         $this->mOldId = $this->getOldIDFromRequest();
 350                 }
 351
 352                 return $this->mOldId;
 353         }
 354
 355         /**
 356          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 357          *
 358          * @return int The old id for the request
 359          */
 360         public function getOldIDFromRequest() {
 361                 global $wgRequest;
 362
 363                 $this->mRedirectUrl = false;
 364
 365                 $oldid = $wgRequest->getVal( 'oldid' );
 366
 367                 if ( isset( $oldid ) ) {
 368                         $oldid = intval( $oldid );
 369                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 370                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 371                                 if ( $nextid ) {
 372                                         $oldid = $nextid;
 373                                 } else {
 374                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 375                                 }
 376                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 377                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 378                                 if ( $previd ) {
 379                                         $oldid = $previd;
 380                                 }
 381                         }
 382                 }
 383
 384                 if ( !$oldid ) {
 385                         $oldid = 0;
 386                 }
 387
 388                 return $oldid;
 389         }
 390
 391         /**
 392          * Load the revision (including text) into this object
 393          */
 394         function loadContent() {
 395                 if ( $this->mContentLoaded ) {
 396                         return;
 397                 }
 398
 399                 wfProfileIn( __METHOD__ );
 400
 401                 $this->fetchContent( $this->getOldID() );
 402
 403                 wfProfileOut( __METHOD__ );
 404         }
 405
 406         /**
 407          * Fetch a page record with the given conditions
 408          * @param $dbr Database object
 409          * @param $conditions Array
 410          * @return mixed Database result resource, or false on failure
 411          */
 412         protected function pageData( $dbr, $conditions ) {
 413                 $fields = array(
 414                                 'page_id',
 415                                 'page_namespace',
 416                                 'page_title',
 417                                 'page_restrictions',
 418                                 'page_counter',
 419                                 'page_is_redirect',
 420                                 'page_is_new',
 421                                 'page_random',
 422                                 'page_touched',
 423                                 'page_latest',
 424                                 'page_len',
 425                 );
 426
 427                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 428
 429                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 430
 431                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 432
 433                 return $row;
 434         }
 435
 436         /**
 437          * Fetch a page record matching the Title object's namespace and title
 438          * using a sanitized title string
 439          *
 440          * @param $dbr Database object
 441          * @param $title Title object
 442          * @return mixed Database result resource, or false on failure
 443          */
 444         public function pageDataFromTitle( $dbr, $title ) {
 445                 return $this->pageData( $dbr, array(
 446                         'page_namespace' => $title->getNamespace(),
 447                         'page_title'     => $title->getDBkey() ) );
 448         }
 449
 450         /**
 451          * Fetch a page record matching the requested ID
 452          *
 453          * @param $dbr Database
 454          * @param $id Integer
 455          */
 456         protected function pageDataFromId( $dbr, $id ) {
 457                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 458         }
 459
 460         /**
 461          * Set the general counter, title etc data loaded from
 462          * some source.
 463          *
 464          * @param $data Database row object or "fromdb"
 465          */
 466         public function loadPageData( $data = 'fromdb' ) {
 467                 if ( $data === 'fromdb' ) {
 468                         $dbr = wfGetDB( DB_SLAVE );
 469                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 470                 }
 471
 472                 $lc = LinkCache::singleton();
 473
 474                 if ( $data ) {
 475                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 476
 477                         $this->mTitle->mArticleID = intval( $data->page_id );
 478
 479                         # Old-fashioned restrictions
 480                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 481
 482                         $this->mCounter     = intval( $data->page_counter );
 483                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 484                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 485                         $this->mLatest      = intval( $data->page_latest );
 486                 } else {
 487                         $lc->addBadLinkObj( $this->mTitle );
 488                         $this->mTitle->mArticleID = 0;
 489                 }
 490
 491                 $this->mDataLoaded = true;
 492         }
 493
 494         /**
 495          * Get text of an article from database
 496          * Does *NOT* follow redirects.
 497          *
 498          * @param $oldid Int: 0 for whatever the latest revision is
 499          * @return mixed string containing article contents, or false if null
 500          */
 501         function fetchContent( $oldid = 0 ) {
 502                 if ( $this->mContentLoaded ) {
 503                         return $this->mContent;
 504                 }
 505
 506                 # Pre-fill content with error message so that if something
 507                 # fails we'll have something telling us what we intended.
 508                 $t = $this->mTitle->getPrefixedText();
 509                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 510                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 511
 512                 if ( $oldid ) {
 513                         $revision = Revision::newFromId( $oldid );
 514                         if ( $revision === null ) {
 515                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 516                                 return false;
 517                         }
 518
 519                         if ( !$this->mDataLoaded || $this->getID() != $revision->getPage() ) {
 520                                 $data = $this->pageDataFromId( wfGetDB( DB_SLAVE ), $revision->getPage() );
 521
 522                                 if ( !$data ) {
 523                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 524                                         return false;
 525                                 }
 526
 527                                 $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 528                                 $this->loadPageData( $data );
 529                         }
 530                 } else {
 531                         if ( !$this->mDataLoaded ) {
 532                                 $this->loadPageData();
 533                         }
 534
 535                         if ( $this->mLatest === false ) {
 536                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 537                                 return false;
 538                         }
 539
 540                         $revision = Revision::newFromId( $this->mLatest );
 541                         if ( $revision === null ) {
 542                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 543                                 return false;
 544                         }
 545                 }
 546
 547                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 548                 // We should instead work with the Revision object when we need it...
 549                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 550
 551                 if ( $revision->getId() == $this->mLatest ) {
 552                         $this->setLastEdit( $revision );
 553                 }
 554
 555                 $this->mRevIdFetched = $revision->getId();
 556                 $this->mContentLoaded = true;
 557                 $this->mRevision =& $revision;
 558
 559                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 560
 561                 return $this->mContent;
 562         }
 563
 564         /**
 565          * Read/write accessor to select FOR UPDATE
 566          *
 567          * @param $x Mixed: FIXME
 568          * @return mixed value of $x, or value stored in Article::mForUpdate
 569          */
 570         public function forUpdate( $x = null ) {
 571                 return wfSetVar( $this->mForUpdate, $x );
 572         }
 573
 574         /**
 575          * Get options for all SELECT statements
 576          *
 577          * @param $options Array: an optional options array which'll be appended to
 578          *                       the default
 579          * @return Array: options
 580          */
 581         protected function getSelectOptions( $options = '' ) {
 582                 if ( $this->mForUpdate ) {
 583                         if ( is_array( $options ) ) {
 584                                 $options[] = 'FOR UPDATE';
 585                         } else {
 586                                 $options = 'FOR UPDATE';
 587                         }
 588                 }
 589
 590                 return $options;
 591         }
 592
 593         /**
 594          * @return int Page ID
 595          */
 596         public function getID() {
 597                 return $this->mTitle->getArticleID();
 598         }
 599
 600         /**
 601          * @return bool Whether or not the page exists in the database
 602          */
 603         public function exists() {
 604                 return $this->getId() > 0;
 605         }
 606
 607         /**
 608          * Check if this page is something we're going to be showing
 609          * some sort of sensible content for. If we return false, page
 610          * views (plain action=view) will return an HTTP 404 response,
 611          * so spiders and robots can know they're following a bad link.
 612          *
 613          * @return bool
 614          */
 615         public function hasViewableContent() {
 616                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 617         }
 618
 619         /**
 620          * @return int The view count for the page
 621          */
 622         public function getCount() {
 623                 if ( -1 == $this->mCounter ) {
 624                         $id = $this->getID();
 625
 626                         if ( $id == 0 ) {
 627                                 $this->mCounter = 0;
 628                         } else {
 629                                 $dbr = wfGetDB( DB_SLAVE );
 630                                 $this->mCounter = $dbr->selectField( 'page',
 631                                         'page_counter',
 632                                         array( 'page_id' => $id ),
 633                                         __METHOD__,
 634                                         $this->getSelectOptions()
 635                                 );
 636                         }
 637                 }
 638
 639                 return $this->mCounter;
 640         }
 641
 642         /**
 643          * Determine whether a page would be suitable for being counted as an
 644          * article in the site_stats table based on the title & its content
 645          *
 646          * @param $text String: text to analyze
 647          * @return bool
 648          */
 649         public function isCountable( $text ) {
 650                 global $wgUseCommaCount;
 651
 652                 $token = $wgUseCommaCount ? ',' : '[[';
 653
 654                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 655         }
 656
 657         /**
 658          * Tests if the article text represents a redirect
 659          *
 660          * @param $text mixed string containing article contents, or boolean
 661          * @return bool
 662          */
 663         public function isRedirect( $text = false ) {
 664                 if ( $text === false ) {
 665                         if ( !$this->mDataLoaded ) {
 666                                 $this->loadPageData();
 667                         }
 668
 669                         return (bool)$this->mIsRedirect;
 670                 } else {
 671                         return Title::newFromRedirect( $text ) !== null;
 672                 }
 673         }
 674
 675         /**
 676          * Returns true if the currently-referenced revision is the current edit
 677          * to this page (and it exists).
 678          * @return bool
 679          */
 680         public function isCurrent() {
 681                 # If no oldid, this is the current version.
 682                 if ( $this->getOldID() == 0 ) {
 683                         return true;
 684                 }
 685
 686                 return $this->exists() && $this->mRevision && $this->mRevision->isCurrent();
 687         }
 688
 689         /**
 690          * Loads everything except the text
 691          * This isn't necessary for all uses, so it's only done if needed.
 692          */
 693         protected function loadLastEdit() {
 694                 if ( -1 != $this->mUser ) {
 695                         return;
 696                 }
 697
 698                 # New or non-existent articles have no user information
 699                 $id = $this->getID();
 700                 if ( 0 == $id ) {
 701                         return;
 702                 }
 703
 704                 $revision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 705                 if ( !is_null( $revision ) ) {
 706                         $this->setLastEdit( $revision );
 707                 }
 708         }
 709
 710         /**
 711          * Set the latest revision
 712          */
 713         protected function setLastEdit( Revision $revision ) {
 714                 $this->mLastRevision = $revision;
 715                 $this->mUser = $revision->getUser();
 716                 $this->mUserText = $revision->getUserText();
 717                 $this->mTimestamp = $revision->getTimestamp();
 718                 $this->mComment = $revision->getComment();
 719                 $this->mMinorEdit = $revision->isMinor();
 720         }
 721
 722         /**
 723          * @return string GMT timestamp of last article revision
 724          */
 725         public function getTimestamp() {
 726                 // Check if the field has been filled by ParserCache::get()
 727                 if ( !$this->mTimestamp ) {
 728                         $this->loadLastEdit();
 729                 }
 730
 731                 return wfTimestamp( TS_MW, $this->mTimestamp );
 732         }
 733
 734         /**
 735          * @return int user ID for the user that made the last article revision
 736          */
 737         public function getUser() {
 738                 $this->loadLastEdit();
 739                 return $this->mUser;
 740         }
 741
 742         /**
 743          * @return string username of the user that made the last article revision
 744          */
 745         public function getUserText() {
 746                 $this->loadLastEdit();
 747                 return $this->mUserText;
 748         }
 749
 750         /**
 751          * @return string Comment stored for the last article revision
 752          */
 753         public function getComment() {
 754                 $this->loadLastEdit();
 755                 return $this->mComment;
 756         }
 757
 758         /**
 759          * Returns true if last revision was marked as "minor edit"
 760          *
 761          * @return boolean Minor edit indicator for the last article revision.
 762          */
 763         public function getMinorEdit() {
 764                 $this->loadLastEdit();
 765                 return $this->mMinorEdit;
 766         }
 767
 768         /**
 769          * Use this to fetch the rev ID used on page views
 770          *
 771          * @return int revision ID of last article revision
 772          */
 773         public function getRevIdFetched() {
 774                 if ( $this->mRevIdFetched ) {
 775                         return $this->mRevIdFetched;
 776                 } else {
 777                         return $this->getLatest();
 778                 }
 779         }
 780
 781         /**
 782          * FIXME: this does what?
 783          * @param $limit Integer: default 0.
 784          * @param $offset Integer: default 0.
 785          * @return UserArrayFromResult object with User objects of article contributors for requested range
 786          */
 787         public function getContributors( $limit = 0, $offset = 0 ) {
 788                 # FIXME: this is expensive; cache this info somewhere.
 789
 790                 $dbr = wfGetDB( DB_SLAVE );
 791                 $revTable = $dbr->tableName( 'revision' );
 792                 $userTable = $dbr->tableName( 'user' );
 793
 794                 $pageId = $this->getId();
 795
 796                 $user = $this->getUser();
 797
 798                 if ( $user ) {
 799                         $excludeCond = "AND rev_user != $user";
 800                 } else {
 801                         $userText = $dbr->addQuotes( $this->getUserText() );
 802                         $excludeCond = "AND rev_user_text != $userText";
 803                 }
 804
 805                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 806
 807                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 808                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 809                         WHERE rev_page = $pageId
 810                         $excludeCond
 811                         AND $deletedBit = 0
 812                         GROUP BY rev_user, rev_user_text
 813                         ORDER BY timestamp DESC";
 814
 815                 if ( $limit > 0 ) {
 816                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 817                 }
 818
 819                 $sql .= ' ' . $this->getSelectOptions();
 820                 $res = $dbr->query( $sql, __METHOD__ );
 821
 822                 return new UserArrayFromResult( $res );
 823         }
 824
 825         /**
 826          * This is the default action of the index.php entry point: just view the
 827          * page of the given title.
 828          */
 829         public function view() {
 830                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 831                 global $wgUseFileCache, $wgUseETag;
 832
 833                 wfProfileIn( __METHOD__ );
 834
 835                 # Get variables from query string
 836                 $oldid = $this->getOldID();
 837                 $parserCache = ParserCache::singleton();
 838
 839                 $parserOptions = $this->getParserOptions();
 840                 # Render printable version, use printable version cache
 841                 if ( $wgOut->isPrintable() ) {
 842                         $parserOptions->setIsPrintable( true );
 843                         $parserOptions->setEditSection( false );
 844                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 845                         $parserOptions->setEditSection( false );
 846                 }
 847
 848                 # Try client and file cache
 849                 if ( $oldid === 0 && $this->checkTouched() ) {
 850                         if ( $wgUseETag ) {
 851                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 852                         }
 853
 854                         # Is it client cached?
 855                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 856                                 wfDebug( __METHOD__ . ": done 304\n" );
 857                                 wfProfileOut( __METHOD__ );
 858
 859                                 return;
 860                         # Try file cache
 861                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 862                                 wfDebug( __METHOD__ . ": done file cache\n" );
 863                                 # tell wgOut that output is taken care of
 864                                 $wgOut->disable();
 865                                 $this->viewUpdates();
 866                                 wfProfileOut( __METHOD__ );
 867
 868                                 return;
 869                         }
 870                 }
 871
 872                 # getOldID may want us to redirect somewhere else
 873                 if ( $this->mRedirectUrl ) {
 874                         $wgOut->redirect( $this->mRedirectUrl );
 875                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 876                         wfProfileOut( __METHOD__ );
 877
 878                         return;
 879                 }
 880
 881                 $wgOut->setArticleFlag( true );
 882                 # Set page title (may be overridden by DISPLAYTITLE)
 883                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 884
 885                 # If we got diff in the query, we want to see a diff page instead of the article.
 886                 if ( $wgRequest->getCheck( 'diff' ) ) {
 887                         wfDebug( __METHOD__ . ": showing diff page\n" );
 888                         $this->showDiffPage();
 889                         wfProfileOut( __METHOD__ );
 890
 891                         return;
 892                 }
 893
 894                 # Allow frames by default
 895                 $wgOut->allowClickjacking();
 896
 897                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 898                         $parserOptions->setEditSection( false );
 899                 }
 900
 901                 # Should the parser cache be used?
 902                 $useParserCache = $this->useParserCache( $oldid );
 903                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 904                 if ( $wgUser->getStubThreshold() ) {
 905                         wfIncrStats( 'pcache_miss_stub' );
 906                 }
 907
 908                 $wasRedirected = $this->showRedirectedFromHeader();
 909                 $this->showNamespaceHeader();
 910
 911                 # Iterate through the possible ways of constructing the output text.
 912                 # Keep going until $outputDone is set, or we run out of things to do.
 913                 $pass = 0;
 914                 $outputDone = false;
 915                 $this->mParserOutput = false;
 916
 917                 while ( !$outputDone && ++$pass ) {
 918                         switch( $pass ) {
 919                                 case 1:
 920                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 921                                         break;
 922                                 case 2:
 923                                         # Try the parser cache
 924                                         if ( $useParserCache ) {
 925                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 926
 927                                                 if ( $this->mParserOutput !== false ) {
 928                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 929                                                         $wgOut->addParserOutput( $this->mParserOutput );
 930                                                         # Ensure that UI elements requiring revision ID have
 931                                                         # the correct version information.
 932                                                         $wgOut->setRevisionId( $this->mLatest );
 933                                                         $outputDone = true;
 934                                                 }
 935                                         }
 936                                         break;
 937                                 case 3:
 938                                         $text = $this->getContent();
 939                                         if ( $text === false || $this->getID() == 0 ) {
 940                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 941                                                 $this->showMissingArticle();
 942                                                 wfProfileOut( __METHOD__ );
 943                                                 return;
 944                                         }
 945
 946                                         # Another whitelist check in case oldid is altering the title
 947                                         if ( !$this->mTitle->userCanRead() ) {
 948                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 949                                                 $wgOut->loginToUse();
 950                                                 $wgOut->output();
 951                                                 $wgOut->disable();
 952                                                 wfProfileOut( __METHOD__ );
 953                                                 return;
 954                                         }
 955
 956                                         # Are we looking at an old revision
 957                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 958                                                 $this->setOldSubtitle( $oldid );
 959
 960                                                 if ( !$this->showDeletedRevisionHeader() ) {
 961                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 962                                                         wfProfileOut( __METHOD__ );
 963                                                         return;
 964                                                 }
 965
 966                                                 # If this "old" version is the current, then try the parser cache...
 967                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 968                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 969                                                         if ( $this->mParserOutput ) {
 970                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 971                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 972                                                                 $wgOut->setRevisionId( $this->mLatest );
 973                                                                 $outputDone = true;
 974                                                                 break;
 975                                                         }
 976                                                 }
 977                                         }
 978
 979                                         # Ensure that UI elements requiring revision ID have
 980                                         # the correct version information.
 981                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 982
 983                                         # Pages containing custom CSS or JavaScript get special treatment
 984                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 985                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 986                                                 $this->showCssOrJsPage();
 987                                                 $outputDone = true;
 988                                         } else {
 989                                                 $rt = Title::newFromRedirectArray( $text );
 990                                                 if ( $rt ) {
 991                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 992                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 993                                                         # Don't append the subtitle if this was an old revision
 994                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 995                                                         # Parse just to get categories, displaytitle, etc.
 996                                                         $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 997                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 998                                                         $outputDone = true;
 999                                                 }
1000                                         }
1001                                         break;
1002                                 case 4:
1003                                         # Run the parse, protected by a pool counter
1004                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1005
1006                                         $key = $parserCache->getKey( $this, $parserOptions );
1007                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1008
1009                                         if ( !$poolArticleView->execute() ) {
1010                                                 # Connection or timeout error
1011                                                 wfProfileOut( __METHOD__ );
1012                                                 return;
1013                                         } else {
1014                                                 $outputDone = true;
1015                                         }
1016                                         break;
1017                                 # Should be unreachable, but just in case...
1018                                 default:
1019                                         break 2;
1020                         }
1021                 }
1022
1023                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1024                 if ( $this->mParserOutput ) {
1025                         $titleText = $this->mParserOutput->getTitleText();
1026
1027                         if ( strval( $titleText ) !== '' ) {
1028                                 $wgOut->setPageTitle( $titleText );
1029                         }
1030                 }
1031
1032                 # For the main page, overwrite the <title> element with the con-
1033                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1034                 # that's not empty).
1035                 # This message always exists because it is in the i18n files
1036                 if ( $this->mTitle->equals( Title::newMainPage() ) ) {
1037                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
1038                         if ( !$msg->isDisabled() ) {
1039                                 $wgOut->setHTMLTitle( $msg->title( $this->mTitle )->text() );
1040                         }
1041                 }
1042
1043                 # Now that we've filled $this->mParserOutput, we know whether
1044                 # there are any __NOINDEX__ tags on the page
1045                 $policy = $this->getRobotPolicy( 'view' );
1046                 $wgOut->setIndexPolicy( $policy['index'] );
1047                 $wgOut->setFollowPolicy( $policy['follow'] );
1048
1049                 $this->showViewFooter();
1050                 $this->viewUpdates();
1051                 wfProfileOut( __METHOD__ );
1052         }
1053
1054         /**
1055          * Show a diff page according to current request variables. For use within
1056          * Article::view() only, other callers should use the DifferenceEngine class.
1057          */
1058         public function showDiffPage() {
1059                 global $wgRequest, $wgUser;
1060
1061                 $diff = $wgRequest->getVal( 'diff' );
1062                 $rcid = $wgRequest->getVal( 'rcid' );
1063                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1064                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1065                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1066                 $oldid = $this->getOldID();
1067
1068                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1069                 // DifferenceEngine directly fetched the revision:
1070                 $this->mRevIdFetched = $de->mNewid;
1071                 $de->showDiffPage( $diffOnly );
1072
1073                 // Needed to get the page's current revision
1074                 $this->loadPageData();
1075                 if ( $diff == 0 || $diff == $this->mLatest ) {
1076                         # Run view updates for current revision only
1077                         $this->viewUpdates();
1078                 }
1079         }
1080
1081         /**
1082          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1083          * Article::view() only.
1084          *
1085          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1086          * page views.
1087          */
1088         protected function showCssOrJsPage() {
1089                 global $wgOut;
1090
1091                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1092
1093                 // Give hooks a chance to customise the output
1094                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1095                         // Wrap the whole lot in a <pre> and don't parse
1096                         $m = array();
1097                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1098                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1099                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1100                         $wgOut->addHTML( "\n</pre>\n" );
1101                 }
1102         }
1103
1104         /**
1105          * Get the robot policy to be used for the current view
1106          * @param $action String the action= GET parameter
1107          * @return Array the policy that should be set
1108          * TODO: actions other than 'view'
1109          */
1110         public function getRobotPolicy( $action ) {
1111                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1112                 global $wgDefaultRobotPolicy, $wgRequest;
1113
1114                 $ns = $this->mTitle->getNamespace();
1115
1116                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1117                         # Don't index user and user talk pages for blocked users (bug 11443)
1118                         if ( !$this->mTitle->isSubpage() ) {
1119                                 $block = new Block();
1120                                 if ( $block->load( $this->mTitle->getText() ) ) {
1121                                         return array(
1122                                                 'index'  => 'noindex',
1123                                                 'follow' => 'nofollow'
1124                                         );
1125                                 }
1126                         }
1127                 }
1128
1129                 if ( $this->getID() === 0 || $this->getOldID() ) {
1130                         # Non-articles (special pages etc), and old revisions
1131                         return array(
1132                                 'index'  => 'noindex',
1133                                 'follow' => 'nofollow'
1134                         );
1135                 } elseif ( $wgOut->isPrintable() ) {
1136                         # Discourage indexing of printable versions, but encourage following
1137                         return array(
1138                                 'index'  => 'noindex',
1139                                 'follow' => 'follow'
1140                         );
1141                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1142                         # For ?curid=x urls, disallow indexing
1143                         return array(
1144                                 'index'  => 'noindex',
1145                                 'follow' => 'follow'
1146                         );
1147                 }
1148
1149                 # Otherwise, construct the policy based on the various config variables.
1150                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1151
1152                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1153                         # Honour customised robot policies for this namespace
1154                         $policy = array_merge(
1155                                 $policy,
1156                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1157                         );
1158                 }
1159                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1160                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1161                         # a final sanity check that we have really got the parser output.
1162                         $policy = array_merge(
1163                                 $policy,
1164                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1165                         );
1166                 }
1167
1168                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1169                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1170                         $policy = array_merge(
1171                                 $policy,
1172                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1173                         );
1174                 }
1175
1176                 return $policy;
1177         }
1178
1179         /**
1180          * Converts a String robot policy into an associative array, to allow
1181          * merging of several policies using array_merge().
1182          * @param $policy Mixed, returns empty array on null/false/'', transparent
1183          *            to already-converted arrays, converts String.
1184          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1185          */
1186         public static function formatRobotPolicy( $policy ) {
1187                 if ( is_array( $policy ) ) {
1188                         return $policy;
1189                 } elseif ( !$policy ) {
1190                         return array();
1191                 }
1192
1193                 $policy = explode( ',', $policy );
1194                 $policy = array_map( 'trim', $policy );
1195
1196                 $arr = array();
1197                 foreach ( $policy as $var ) {
1198                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1199                                 $arr['index'] = $var;
1200                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1201                                 $arr['follow'] = $var;
1202                         }
1203                 }
1204
1205                 return $arr;
1206         }
1207
1208         /**
1209          * If this request is a redirect view, send "redirected from" subtitle to
1210          * $wgOut. Returns true if the header was needed, false if this is not a
1211          * redirect view. Handles both local and remote redirects.
1212          *
1213          * @return boolean
1214          */
1215         public function showRedirectedFromHeader() {
1216                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1217
1218                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1219
1220                 if ( isset( $this->mRedirectedFrom ) ) {
1221                         // This is an internally redirected page view.
1222                         // We'll need a backlink to the source page for navigation.
1223                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1224                                 $redir = $wgUser->getSkin()->link(
1225                                         $this->mRedirectedFrom,
1226                                         null,
1227                                         array(),
1228                                         array( 'redirect' => 'no' ),
1229                                         array( 'known', 'noclasses' )
1230                                 );
1231
1232                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1233                                 $wgOut->setSubtitle( $s );
1234
1235                                 // Set the fragment if one was specified in the redirect
1236                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1237                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1238                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1239                                 }
1240
1241                                 // Add a <link rel="canonical"> tag
1242                                 $wgOut->addLink( array( 'rel' => 'canonical',
1243                                         'href' => $this->mTitle->getLocalURL() )
1244                                 );
1245
1246                                 return true;
1247                         }
1248                 } elseif ( $rdfrom ) {
1249                         // This is an externally redirected view, from some other wiki.
1250                         // If it was reported from a trusted site, supply a backlink.
1251                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1252                                 $redir = $wgUser->getSkin()->makeExternalLink( $rdfrom, $rdfrom );
1253                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1254                                 $wgOut->setSubtitle( $s );
1255
1256                                 return true;
1257                         }
1258                 }
1259
1260                 return false;
1261         }
1262
1263         /**
1264          * Show a header specific to the namespace currently being viewed, like
1265          * [[MediaWiki:Talkpagetext]]. For Article::view().
1266          */
1267         public function showNamespaceHeader() {
1268                 global $wgOut;
1269
1270                 if ( $this->mTitle->isTalkPage() ) {
1271                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1272                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1273                         }
1274                 }
1275         }
1276
1277         /**
1278          * Show the footer section of an ordinary page view
1279          */
1280         public function showViewFooter() {
1281                 global $wgOut, $wgUseTrackbacks;
1282
1283                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1284                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1285                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1286                 }
1287
1288                 # If we have been passed an &rcid= parameter, we want to give the user a
1289                 # chance to mark this new article as patrolled.
1290                 $this->showPatrolFooter();
1291
1292                 # Trackbacks
1293                 if ( $wgUseTrackbacks ) {
1294                         $this->addTrackbacks();
1295                 }
1296
1297                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
1298
1299         }
1300
1301         /**
1302          * If patrol is possible, output a patrol UI box. This is called from the
1303          * footer section of ordinary page views. If patrol is not possible or not
1304          * desired, does nothing.
1305          */
1306         public function showPatrolFooter() {
1307                 global $wgOut, $wgRequest, $wgUser;
1308
1309                 $rcid = $wgRequest->getVal( 'rcid' );
1310
1311                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1312                         return;
1313                 }
1314
1315                 $sk = $wgUser->getSkin();
1316                 $token = $wgUser->editToken( $rcid );
1317                 $wgOut->preventClickjacking();
1318
1319                 $wgOut->addHTML(
1320                         "<div class='patrollink'>" .
1321                                 wfMsgHtml(
1322                                         'markaspatrolledlink',
1323                                         $sk->link(
1324                                                 $this->mTitle,
1325                                                 wfMsgHtml( 'markaspatrolledtext' ),
1326                                                 array(),
1327                                                 array(
1328                                                         'action' => 'markpatrolled',
1329                                                         'rcid' => $rcid,
1330                                                         'token' => $token,
1331                                                 ),
1332                                                 array( 'known', 'noclasses' )
1333                                         )
1334                                 ) .
1335                         '</div>'
1336                 );
1337         }
1338
1339         /**
1340          * Show the error text for a missing article. For articles in the MediaWiki
1341          * namespace, show the default message text. To be called from Article::view().
1342          */
1343         public function showMissingArticle() {
1344                 global $wgOut, $wgRequest, $wgUser;
1345
1346                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1347                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1348                         $parts = explode( '/', $this->mTitle->getText() );
1349                         $rootPart = $parts[0];
1350                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1351                         $ip = User::isIP( $rootPart );
1352
1353                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1354                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1355                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1356                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1357                                 LogEventsList::showLogExtract(
1358                                         $wgOut,
1359                                         'block',
1360                                         $user->getUserPage()->getPrefixedText(),
1361                                         '',
1362                                         array(
1363                                                 'lim' => 1,
1364                                                 'showIfEmpty' => false,
1365                                                 'msgKey' => array(
1366                                                         'blocked-notice-logextract',
1367                                                         $user->getName() # Support GENDER in notice
1368                                                 )
1369                                         )
1370                                 );
1371                         }
1372                 }
1373
1374                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1375
1376                 # Show delete and move logs
1377                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1378                         array(  'lim' => 10,
1379                                 'conds' => array( "log_action != 'revision'" ),
1380                                 'showIfEmpty' => false,
1381                                 'msgKey' => array( 'moveddeleted-notice' ) )
1382                 );
1383
1384                 # Show error message
1385                 $oldid = $this->getOldID();
1386                 if ( $oldid ) {
1387                         $text = wfMsgNoTrans( 'missing-article',
1388                                 $this->mTitle->getPrefixedText(),
1389                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1390                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1391                         // Use the default message text
1392                         $text = $this->mTitle->getDefaultMessageText();
1393                 } else {
1394                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1395                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1396                         $errors = array_merge( $createErrors, $editErrors );
1397
1398                         if ( !count( $errors ) ) {
1399                                 $text = wfMsgNoTrans( 'noarticletext' );
1400                         } else {
1401                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1402                         }
1403                 }
1404                 $text = "<div class='noarticletext'>\n$text\n</div>";
1405
1406                 if ( !$this->hasViewableContent() ) {
1407                         // If there's no backing content, send a 404 Not Found
1408                         // for better machine handling of broken links.
1409                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1410                 }
1411
1412                 $wgOut->addWikiText( $text );
1413         }
1414
1415         /**
1416          * If the revision requested for view is deleted, check permissions.
1417          * Send either an error message or a warning header to $wgOut.
1418          *
1419          * @return boolean true if the view is allowed, false if not.
1420          */
1421         public function showDeletedRevisionHeader() {
1422                 global $wgOut, $wgRequest;
1423
1424                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1425                         // Not deleted
1426                         return true;
1427                 }
1428
1429                 // If the user is not allowed to see it...
1430                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1431                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1432                                 'rev-deleted-text-permission' );
1433
1434                         return false;
1435                 // If the user needs to confirm that they want to see it...
1436                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1437                         # Give explanation and add a link to view the revision...
1438                         $oldid = intval( $this->getOldID() );
1439                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1440                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1441                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1442                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1443                                 array( $msg, $link ) );
1444
1445                         return false;
1446                 // We are allowed to see...
1447                 } else {
1448                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1449                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1450                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1451
1452                         return true;
1453                 }
1454         }
1455
1456         /**
1457          * Should the parser cache be used?
1458          *
1459          * @return boolean
1460          */
1461         public function useParserCache( $oldid ) {
1462                 global $wgUser, $wgEnableParserCache;
1463
1464                 return $wgEnableParserCache
1465                         && $wgUser->getStubThreshold() == 0
1466                         && $this->exists()
1467                         && empty( $oldid )
1468                         && !$this->mTitle->isCssOrJsPage()
1469                         && !$this->mTitle->isCssJsSubpage();
1470         }
1471
1472         /**
1473          * Execute the uncached parse for action=view
1474          */
1475         public function doViewParse() {
1476                 global $wgOut;
1477
1478                 $oldid = $this->getOldID();
1479                 $parserOptions = $this->getParserOptions();
1480
1481                 # Render printable version, use printable version cache
1482                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1483
1484                 # Don't show section-edit links on old revisions... this way lies madness.
1485                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->mTitle->quickUserCan( 'edit' ) ) {
1486                         $parserOptions->setEditSection( false );
1487                 }
1488
1489                 $useParserCache = $this->useParserCache( $oldid );
1490                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1491
1492                 return true;
1493         }
1494
1495         /**
1496          * Try to fetch an expired entry from the parser cache. If it is present,
1497          * output it and return true. If it is not present, output nothing and
1498          * return false. This is used as a callback function for
1499          * PoolCounter::executeProtected().
1500          *
1501          * @return boolean
1502          */
1503         public function tryDirtyCache() {
1504                 global $wgOut;
1505                 $parserCache = ParserCache::singleton();
1506                 $options = $this->getParserOptions();
1507
1508                 if ( $wgOut->isPrintable() ) {
1509                         $options->setIsPrintable( true );
1510                         $options->setEditSection( false );
1511                 }
1512
1513                 $output = $parserCache->getDirty( $this, $options );
1514
1515                 if ( $output ) {
1516                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1517                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1518                         $wgOut->setSquidMaxage( 0 );
1519                         $this->mParserOutput = $output;
1520                         $wgOut->addParserOutput( $output );
1521                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1522
1523                         return true;
1524                 } else {
1525                         wfDebugLog( 'dirty', "dirty missing\n" );
1526                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1527
1528                         return false;
1529                 }
1530         }
1531
1532         /**
1533          * View redirect
1534          *
1535          * @param $target Title|Array of destination(s) to redirect
1536          * @param $appendSubtitle Boolean [optional]
1537          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1538          * @return string containing HMTL with redirect link
1539          */
1540         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1541                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1542
1543                 if ( !is_array( $target ) ) {
1544                         $target = array( $target );
1545                 }
1546
1547                 $imageDir = $wgContLang->getDir();
1548
1549                 if ( $appendSubtitle ) {
1550                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1551                 }
1552
1553                 $sk = $wgUser->getSkin();
1554                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1555                 $title = array_shift( $target );
1556
1557                 if ( $forceKnown ) {
1558                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1559                 } else {
1560                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1561                 }
1562
1563                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1564                 $alt = $wgContLang->isRTL() ? '←' : '→';
1565                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1566                 foreach ( $target as $rt ) {
1567                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1568                         if ( $forceKnown ) {
1569                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1570                         } else {
1571                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1572                         }
1573                 }
1574
1575                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1576                 return '<div class="redirectMsg">' .
1577                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1578                         '<span class="redirectText">' . $link . '</span></div>';
1579         }
1580
1581         /**
1582          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1583          */
1584         public function addTrackbacks() {
1585                 global $wgOut, $wgUser;
1586
1587                 $dbr = wfGetDB( DB_SLAVE );
1588                 $tbs = $dbr->select( 'trackbacks',
1589                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1590                         array( 'tb_page' => $this->getID() )
1591                 );
1592
1593                 if ( !$dbr->numRows( $tbs ) ) {
1594                         return;
1595                 }
1596
1597                 $wgOut->preventClickjacking();
1598
1599                 $tbtext = "";
1600                 foreach ( $tbs as $o ) {
1601                         $rmvtxt = "";
1602
1603                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1604                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1605                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1606                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1607                         }
1608
1609                         $tbtext .= "\n";
1610                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1611                                         $o->tb_title,
1612                                         $o->tb_url,
1613                                         $o->tb_ex,
1614                                         $o->tb_name,
1615                                         $rmvtxt );
1616                 }
1617
1618                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1619         }
1620
1621         /**
1622          * Removes trackback record for current article from trackbacks table
1623          */
1624         public function deletetrackback() {
1625                 global $wgUser, $wgRequest, $wgOut;
1626
1627                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1628                         $wgOut->addWikiMsg( 'sessionfailure' );
1629
1630                         return;
1631                 }
1632
1633                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1634
1635                 if ( count( $permission_errors ) ) {
1636                         $wgOut->showPermissionsErrorPage( $permission_errors );
1637
1638                         return;
1639                 }
1640
1641                 $db = wfGetDB( DB_MASTER );
1642                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1643
1644                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1645                 $this->mTitle->invalidateCache();
1646         }
1647
1648         /**
1649          * Handle action=render
1650          */
1651
1652         public function render() {
1653                 global $wgOut;
1654
1655                 $wgOut->setArticleBodyOnly( true );
1656                 $this->view();
1657         }
1658
1659         /**
1660          * Handle action=purge
1661          */
1662         public function purge() {
1663                 global $wgUser, $wgRequest, $wgOut;
1664
1665                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1666                         //FIXME: shouldn't this be in doPurge()?
1667                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1668                                 $this->doPurge();
1669                                 $this->view();
1670                         }
1671                 } else {
1672                         $formParams = array(
1673                                 'method' => 'post',
1674                                 'action' =>  $wgRequest->getRequestURL(),
1675                         );
1676
1677                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1678
1679                         $form  = Html::openElement( 'form', $formParams );
1680                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1681                         $form .= Html::closeElement( 'form' );
1682
1683                         $wgOut->addHTML( $form );
1684                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1685
1686                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1687                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1688                 }
1689         }
1690
1691         /**
1692          * Perform the actions of a page purging
1693          */
1694         public function doPurge() {
1695                 global $wgUseSquid;
1696
1697                 // Invalidate the cache
1698                 $this->mTitle->invalidateCache();
1699                 $this->clear();
1700
1701                 if ( $wgUseSquid ) {
1702                         // Commit the transaction before the purge is sent
1703                         $dbw = wfGetDB( DB_MASTER );
1704                         $dbw->commit();
1705
1706                         // Send purge
1707                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1708                         $update->doUpdate();
1709                 }
1710
1711                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1712                         if ( $this->getID() == 0 ) {
1713                                 $text = false;
1714                         } else {
1715                                 $text = $this->getRawText();
1716                         }
1717
1718                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1719                 }
1720         }
1721
1722         /**
1723          * Insert a new empty page record for this article.
1724          * This *must* be followed up by creating a revision
1725          * and running $this->updateRevisionOn( ... );
1726          * or else the record will be left in a funky state.
1727          * Best if all done inside a transaction.
1728          *
1729          * @param $dbw Database
1730          * @return int The newly created page_id key, or false if the title already existed
1731          * @private
1732          */
1733         public function insertOn( $dbw ) {
1734                 wfProfileIn( __METHOD__ );
1735
1736                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1737                 $dbw->insert( 'page', array(
1738                         'page_id'           => $page_id,
1739                         'page_namespace'    => $this->mTitle->getNamespace(),
1740                         'page_title'        => $this->mTitle->getDBkey(),
1741                         'page_counter'      => 0,
1742                         'page_restrictions' => '',
1743                         'page_is_redirect'  => 0, # Will set this shortly...
1744                         'page_is_new'       => 1,
1745                         'page_random'       => wfRandom(),
1746                         'page_touched'      => $dbw->timestamp(),
1747                         'page_latest'       => 0, # Fill this in shortly...
1748                         'page_len'          => 0, # Fill this in shortly...
1749                 ), __METHOD__, 'IGNORE' );
1750
1751                 $affected = $dbw->affectedRows();
1752
1753                 if ( $affected ) {
1754                         $newid = $dbw->insertId();
1755                         $this->mTitle->resetArticleID( $newid );
1756                 }
1757                 wfProfileOut( __METHOD__ );
1758
1759                 return $affected ? $newid : false;
1760         }
1761
1762         /**
1763          * Update the page record to point to a newly saved revision.
1764          *
1765          * @param $dbw DatabaseBase: object
1766          * @param $revision Revision: For ID number, and text used to set
1767                                                 length and redirect status fields
1768          * @param $lastRevision Integer: if given, will not overwrite the page field
1769          *                      when different from the currently set value.
1770          *                      Giving 0 indicates the new page flag should be set
1771          *                      on.
1772          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1773          *                           removing rows in redirect table.
1774          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1775          *                    Needed when $lastRevision has to be set to sth. !=0
1776          * @return bool true on success, false on failure
1777          * @private
1778          */
1779         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1780                 wfProfileIn( __METHOD__ );
1781
1782                 $text = $revision->getText();
1783                 $rt = Title::newFromRedirectRecurse( $text );
1784
1785                 $conditions = array( 'page_id' => $this->getId() );
1786
1787                 if ( !is_null( $lastRevision ) ) {
1788                         # An extra check against threads stepping on each other
1789                         $conditions['page_latest'] = $lastRevision;
1790                 }
1791
1792                 if ( !$setNewFlag ) {
1793                         $setNewFlag = ( $lastRevision === 0 );
1794                 }
1795
1796                 $dbw->update( 'page',
1797                         array( /* SET */
1798                                 'page_latest'      => $revision->getId(),
1799                                 'page_touched'     => $dbw->timestamp(),
1800                                 'page_is_new'      => $setNewFlag,
1801                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1802                                 'page_len'         => strlen( $text ),
1803                         ),
1804                         $conditions,
1805                         __METHOD__ );
1806
1807                 $result = $dbw->affectedRows() != 0;
1808                 if ( $result ) {
1809                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1810                 }
1811
1812                 wfProfileOut( __METHOD__ );
1813                 return $result;
1814         }
1815
1816         /**
1817          * Add row to the redirect table if this is a redirect, remove otherwise.
1818          *
1819          * @param $dbw Database
1820          * @param $redirectTitle Title object pointing to the redirect target,
1821          *                       or NULL if this is not a redirect
1822          * @param $lastRevIsRedirect If given, will optimize adding and
1823          *                           removing rows in redirect table.
1824          * @return bool true on success, false on failure
1825          * @private
1826          */
1827         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1828                 // Always update redirects (target link might have changed)
1829                 // Update/Insert if we don't know if the last revision was a redirect or not
1830                 // Delete if changing from redirect to non-redirect
1831                 $isRedirect = !is_null( $redirectTitle );
1832
1833                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
1834                         return true;
1835                 }
1836
1837                 wfProfileIn( __METHOD__ );
1838                 if ( $isRedirect ) {
1839                         $this->insertRedirectEntry( $redirectTitle );
1840                 } else {
1841                         // This is not a redirect, remove row from redirect table
1842                         $where = array( 'rd_from' => $this->getId() );
1843                         $dbw->delete( 'redirect', $where, __METHOD__ );
1844                 }
1845
1846                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1847                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1848                 }
1849                 wfProfileOut( __METHOD__ );
1850
1851                 return ( $dbw->affectedRows() != 0 );
1852         }
1853
1854         /**
1855          * If the given revision is newer than the currently set page_latest,
1856          * update the page record. Otherwise, do nothing.
1857          *
1858          * @param $dbw Database object
1859          * @param $revision Revision object
1860          * @return mixed
1861          */
1862         public function updateIfNewerOn( &$dbw, $revision ) {
1863                 wfProfileIn( __METHOD__ );
1864
1865                 $row = $dbw->selectRow(
1866                         array( 'revision', 'page' ),
1867                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1868                         array(
1869                                 'page_id' => $this->getId(),
1870                                 'page_latest=rev_id' ),
1871                         __METHOD__ );
1872
1873                 if ( $row ) {
1874                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1875                                 wfProfileOut( __METHOD__ );
1876                                 return false;
1877                         }
1878                         $prev = $row->rev_id;
1879                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1880                 } else {
1881                         # No or missing previous revision; mark the page as new
1882                         $prev = 0;
1883                         $lastRevIsRedirect = null;
1884                 }
1885
1886                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1887
1888                 wfProfileOut( __METHOD__ );
1889                 return $ret;
1890         }
1891
1892         /**
1893          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1894          * @param $text String: new text of the section
1895          * @param $summary String: new section's subject, only if $section is 'new'
1896          * @param $edittime String: revision timestamp or null to use the current revision
1897          * @return string Complete article text, or null if error
1898          */
1899         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1900                 wfProfileIn( __METHOD__ );
1901
1902                 if ( strval( $section ) == '' ) {
1903                         // Whole-page edit; let the whole text through
1904                 } else {
1905                         if ( is_null( $edittime ) ) {
1906                                 $rev = Revision::newFromTitle( $this->mTitle );
1907                         } else {
1908                                 $dbw = wfGetDB( DB_MASTER );
1909                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1910                         }
1911
1912                         if ( !$rev ) {
1913                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1914                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1915                                 wfProfileOut( __METHOD__ );
1916                                 return null;
1917                         }
1918
1919                         $oldtext = $rev->getText();
1920
1921                         if ( $section == 'new' ) {
1922                                 # Inserting a new section
1923                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1924                                 $text = strlen( trim( $oldtext ) ) > 0
1925                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1926                                                 : "{$subject}{$text}";
1927                         } else {
1928                                 # Replacing an existing section; roll out the big guns
1929                                 global $wgParser;
1930
1931                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1932                         }
1933                 }
1934
1935                 wfProfileOut( __METHOD__ );
1936                 return $text;
1937         }
1938
1939         /**
1940          * @deprecated @since 1.7 use Article::doEdit()
1941          */
1942         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1943                 wfDeprecated( __METHOD__ );
1944
1945                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1946                         ( $isminor ? EDIT_MINOR : 0 ) |
1947                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1948                         ( $bot ? EDIT_FORCE_BOT : 0 );
1949
1950                 # If this is a comment, add the summary as headline
1951                 if ( $comment && $summary != "" ) {
1952                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1953                 }
1954                 $this->doEdit( $text, $summary, $flags );
1955
1956                 $dbw = wfGetDB( DB_MASTER );
1957                 if ( $watchthis ) {
1958                         if ( !$this->mTitle->userIsWatching() ) {
1959                                 $dbw->begin();
1960                                 $this->doWatch();
1961                                 $dbw->commit();
1962                         }
1963                 } else {
1964                         if ( $this->mTitle->userIsWatching() ) {
1965                                 $dbw->begin();
1966                                 $this->doUnwatch();
1967                                 $dbw->commit();
1968                         }
1969                 }
1970                 $this->doRedirect( $this->isRedirect( $text ) );
1971         }
1972
1973         /**
1974          * @deprecated @since 1.7 use Article::doEdit()
1975          */
1976         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1977                 wfDeprecated( __METHOD__ );
1978
1979                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1980                         ( $minor ? EDIT_MINOR : 0 ) |
1981                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1982
1983                 $status = $this->doEdit( $text, $summary, $flags );
1984
1985                 if ( !$status->isOK() ) {
1986                         return false;
1987                 }
1988
1989                 $dbw = wfGetDB( DB_MASTER );
1990                 if ( $watchthis ) {
1991                         if ( !$this->mTitle->userIsWatching() ) {
1992                                 $dbw->begin();
1993                                 $this->doWatch();
1994                                 $dbw->commit();
1995                         }
1996                 } else {
1997                         if ( $this->mTitle->userIsWatching() ) {
1998                                 $dbw->begin();
1999                                 $this->doUnwatch();
2000                                 $dbw->commit();
2001                         }
2002                 }
2003
2004                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
2005                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
2006
2007                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
2008                 return true;
2009         }
2010
2011         /**
2012          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
2013          * @param $flags Int
2014          * @return Int updated $flags
2015          */
2016         function checkFlags( $flags ) {
2017                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
2018                         if ( $this->mTitle->getArticleID() ) {
2019                                 $flags |= EDIT_UPDATE;
2020                         } else {
2021                                 $flags |= EDIT_NEW;
2022                         }
2023                 }
2024
2025                 return $flags;
2026         }
2027
2028         /**
2029          * Article::doEdit()
2030          *
2031          * Change an existing article or create a new article. Updates RC and all necessary caches,
2032          * optionally via the deferred update array.
2033          *
2034          * $wgUser must be set before calling this function.
2035          *
2036          * @param $text String: new text
2037          * @param $summary String: edit summary
2038          * @param $flags Integer bitfield:
2039          *      EDIT_NEW
2040          *          Article is known or assumed to be non-existent, create a new one
2041          *      EDIT_UPDATE
2042          *          Article is known or assumed to be pre-existing, update it
2043          *      EDIT_MINOR
2044          *          Mark this edit minor, if the user is allowed to do so
2045          *      EDIT_SUPPRESS_RC
2046          *          Do not log the change in recentchanges
2047          *      EDIT_FORCE_BOT
2048          *          Mark the edit a "bot" edit regardless of user rights
2049          *      EDIT_DEFER_UPDATES
2050          *          Defer some of the updates until the end of index.php
2051          *      EDIT_AUTOSUMMARY
2052          *          Fill in blank summaries with generated text where possible
2053          *
2054          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2055          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2056          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2057          * edit-already-exists error will be returned. These two conditions are also possible with
2058          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2059          *
2060          * @param $baseRevId the revision ID this edit was based off, if any
2061          * @param $user User (optional), $wgUser will be used if not passed
2062          *
2063          * @return Status object. Possible errors:
2064          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2065          *     edit-gone-missing:       In update mode, but the article didn't exist
2066          *     edit-conflict:           In update mode, the article changed unexpectedly
2067          *     edit-no-change:          Warning that the text was the same as before
2068          *     edit-already-exists:     In creation mode, but the article already exists
2069          *
2070          *  Extensions may define additional errors.
2071          *
2072          *  $return->value will contain an associative array with members as follows:
2073          *     new:                     Boolean indicating if the function attempted to create a new article
2074          *     revision:                The revision object for the inserted revision, or null
2075          *
2076          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2077          */
2078         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2079                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2080
2081                 # Low-level sanity check
2082                 if ( $this->mTitle->getText() === '' ) {
2083                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2084                 }
2085
2086                 wfProfileIn( __METHOD__ );
2087
2088                 $user = is_null( $user ) ? $wgUser : $user;
2089                 $status = Status::newGood( array() );
2090
2091                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2092                 $this->loadPageData();
2093
2094                 $flags = $this->checkFlags( $flags );
2095
2096                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2097                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2098                 {
2099                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2100
2101                         if ( $status->isOK() ) {
2102                                 $status->fatal( 'edit-hook-aborted' );
2103                         }
2104
2105                         wfProfileOut( __METHOD__ );
2106                         return $status;
2107                 }
2108
2109                 # Silently ignore EDIT_MINOR if not allowed
2110                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2111                 $bot = $flags & EDIT_FORCE_BOT;
2112
2113                 $oldtext = $this->getRawText(); // current revision
2114                 $oldsize = strlen( $oldtext );
2115
2116                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2117                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2118                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2119                 }
2120
2121                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
2122                 $text = $editInfo->pst;
2123                 $newsize = strlen( $text );
2124
2125                 $dbw = wfGetDB( DB_MASTER );
2126                 $now = wfTimestampNow();
2127                 $this->mTimestamp = $now;
2128
2129                 if ( $flags & EDIT_UPDATE ) {
2130                         # Update article, but only if changed.
2131                         $status->value['new'] = false;
2132
2133                         # Make sure the revision is either completely inserted or not inserted at all
2134                         if ( !$wgDBtransactions ) {
2135                                 $userAbort = ignore_user_abort( true );
2136                         }
2137
2138                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2139
2140                         if ( $changed ) {
2141                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2142                                   - (int)$this->isCountable( $oldtext );
2143                                 $this->mTotalAdjustment = 0;
2144
2145                                 if ( !$this->mLatest ) {
2146                                         # Article gone missing
2147                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2148                                         $status->fatal( 'edit-gone-missing' );
2149
2150                                         wfProfileOut( __METHOD__ );
2151                                         return $status;
2152                                 }
2153
2154                                 $revision = new Revision( array(
2155                                         'page'       => $this->getId(),
2156                                         'comment'    => $summary,
2157                                         'minor_edit' => $isminor,
2158                                         'text'       => $text,
2159                                         'parent_id'  => $this->mLatest,
2160                                         'user'       => $user->getId(),
2161                                         'user_text'  => $user->getName(),
2162                                         'timestamp'  => $now
2163                                 ) );
2164
2165                                 $dbw->begin();
2166                                 $revisionId = $revision->insertOn( $dbw );
2167
2168                                 # Update page
2169                                 #
2170                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2171                                 # during the course of this function. This makes sure that EditPage can detect
2172                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2173                                 # before this function is called. A previous function used a separate query, this
2174                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2175                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2176
2177                                 if ( !$ok ) {
2178                                         /* Belated edit conflict! Run away!! */
2179                                         $status->fatal( 'edit-conflict' );
2180
2181                                         # Delete the invalid revision if the DB is not transactional
2182                                         if ( !$wgDBtransactions ) {
2183                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2184                                         }
2185
2186                                         $revisionId = 0;
2187                                         $dbw->rollback();
2188                                 } else {
2189                                         global $wgUseRCPatrol;
2190                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2191                                         # Update recentchanges
2192                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2193                                                 # Mark as patrolled if the user can do so
2194                                                 $patrolled = $wgUseRCPatrol && !count(
2195                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2196                                                 # Add RC row to the DB
2197                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2198                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2199                                                         $revisionId, $patrolled
2200                                                 );
2201
2202                                                 # Log auto-patrolled edits
2203                                                 if ( $patrolled ) {
2204                                                         PatrolLog::record( $rc, true );
2205                                                 }
2206                                         }
2207                                         $user->incEditCount();
2208                                         $dbw->commit();
2209                                 }
2210                         } else {
2211                                 $status->warning( 'edit-no-change' );
2212                                 $revision = null;
2213                                 // Keep the same revision ID, but do some updates on it
2214                                 $revisionId = $this->getLatest();
2215                                 // Update page_touched, this is usually implicit in the page update
2216                                 // Other cache updates are done in onArticleEdit()
2217                                 $this->mTitle->invalidateCache();
2218                         }
2219
2220                         if ( !$wgDBtransactions ) {
2221                                 ignore_user_abort( $userAbort );
2222                         }
2223
2224                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2225                         if ( !$status->isOK() ) {
2226                                 wfProfileOut( __METHOD__ );
2227                                 return $status;
2228                         }
2229
2230                         # Invalidate cache of this article and all pages using this article
2231                         # as a template. Partly deferred.
2232                         Article::onArticleEdit( $this->mTitle );
2233                         # Update links tables, site stats, etc.
2234                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed, $user );
2235                 } else {
2236                         # Create new article
2237                         $status->value['new'] = true;
2238
2239                         # Set statistics members
2240                         # We work out if it's countable after PST to avoid counter drift
2241                         # when articles are created with {{subst:}}
2242                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2243                         $this->mTotalAdjustment = 1;
2244
2245                         $dbw->begin();
2246
2247                         # Add the page record; stake our claim on this title!
2248                         # This will return false if the article already exists
2249                         $newid = $this->insertOn( $dbw );
2250
2251                         if ( $newid === false ) {
2252                                 $dbw->rollback();
2253                                 $status->fatal( 'edit-already-exists' );
2254
2255                                 wfProfileOut( __METHOD__ );
2256                                 return $status;
2257                         }
2258
2259                         # Save the revision text...
2260                         $revision = new Revision( array(
2261                                 'page'       => $newid,
2262                                 'comment'    => $summary,
2263                                 'minor_edit' => $isminor,
2264                                 'text'       => $text,
2265                                 'user'       => $user->getId(),
2266                                 'user_text'  => $user->getName(),
2267                                 'timestamp'  => $now
2268                         ) );
2269                         $revisionId = $revision->insertOn( $dbw );
2270
2271                         $this->mTitle->resetArticleID( $newid );
2272                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached (FIXME?)
2273                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
2274
2275                         # Update the page record with revision data
2276                         $this->updateRevisionOn( $dbw, $revision, 0 );
2277
2278                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2279
2280                         # Update recentchanges
2281                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2282                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2283
2284                                 # Mark as patrolled if the user can do so
2285                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
2286                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2287                                 # Add RC row to the DB
2288                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2289                                         '', strlen( $text ), $revisionId, $patrolled );
2290
2291                                 # Log auto-patrolled edits
2292                                 if ( $patrolled ) {
2293                                         PatrolLog::record( $rc, true );
2294                                 }
2295                         }
2296                         $user->incEditCount();
2297                         $dbw->commit();
2298
2299                         # Update links, etc.
2300                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true, $user );
2301
2302                         # Clear caches
2303                         Article::onArticleCreate( $this->mTitle );
2304
2305                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2306                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2307                 }
2308
2309                 # Do updates right now unless deferral was requested
2310                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2311                         wfDoUpdates();
2312                 }
2313
2314                 // Return the new revision (or null) to the caller
2315                 $status->value['revision'] = $revision;
2316
2317                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2318                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2319
2320                 wfProfileOut( __METHOD__ );
2321                 return $status;
2322         }
2323
2324         /**
2325          * Output a redirect back to the article.
2326          * This is typically used after an edit.
2327          *
2328          * @param $noRedir Boolean: add redirect=no
2329          * @param $sectionAnchor String: section to redirect to, including "#"
2330          * @param $extraQuery String: extra query params
2331          */
2332         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2333                 global $wgOut;
2334
2335                 if ( $noRedir ) {
2336                         $query = 'redirect=no';
2337                         if ( $extraQuery )
2338                                 $query .= "&$extraQuery";
2339                 } else {
2340                         $query = $extraQuery;
2341                 }
2342
2343                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2344         }
2345
2346         /**
2347          * Mark this particular edit/page as patrolled
2348          */
2349         public function markpatrolled() {
2350                 global $wgOut, $wgUser, $wgRequest;
2351
2352                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2353
2354                 # If we haven't been given an rc_id value, we can't do anything
2355                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2356
2357                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $rcid ) ) {
2358                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2359                         return;
2360                 }
2361
2362                 $rc = RecentChange::newFromId( $rcid );
2363
2364                 if ( is_null( $rc ) ) {
2365                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2366                         return;
2367                 }
2368
2369                 # It would be nice to see where the user had actually come from, but for now just guess
2370                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2371                 $return = SpecialPage::getTitleFor( $returnto );
2372
2373                 $errors = $rc->doMarkPatrolled();
2374
2375                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2376                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2377
2378                         return;
2379                 }
2380
2381                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2382                         // The hook itself has handled any output
2383                         return;
2384                 }
2385
2386                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2387                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2388                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2389                         $wgOut->returnToMain( false, $return );
2390
2391                         return;
2392                 }
2393
2394                 if ( !empty( $errors ) ) {
2395                         $wgOut->showPermissionsErrorPage( $errors );
2396
2397                         return;
2398                 }
2399
2400                 # Inform the user
2401                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2402                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2403                 $wgOut->returnToMain( false, $return );
2404         }
2405
2406         /**
2407          * User-interface handler for the "watch" action
2408          */
2409         public function watch() {
2410                 global $wgUser, $wgOut;
2411
2412                 if ( $wgUser->isAnon() ) {
2413                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2414                         return;
2415                 }
2416
2417                 if ( wfReadOnly() ) {
2418                         $wgOut->readOnlyPage();
2419                         return;
2420                 }
2421
2422                 if ( $this->doWatch() ) {
2423                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2424                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2425                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2426                 }
2427
2428                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2429         }
2430
2431         /**
2432          * Add this page to $wgUser's watchlist
2433          *
2434          * This is safe to be called multiple times
2435          *
2436          * @return bool true on successful watch operation
2437          */
2438         public function doWatch() {
2439                 global $wgUser;
2440
2441                 if ( $wgUser->isAnon() ) {
2442                         return false;
2443                 }
2444
2445                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2446                         $wgUser->addWatch( $this->mTitle );
2447                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2448                 }
2449
2450                 return false;
2451         }
2452
2453         /**
2454          * User interface handler for the "unwatch" action.
2455          */
2456         public function unwatch() {
2457                 global $wgUser, $wgOut;
2458
2459                 if ( $wgUser->isAnon() ) {
2460                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2461                         return;
2462                 }
2463
2464                 if ( wfReadOnly() ) {
2465                         $wgOut->readOnlyPage();
2466                         return;
2467                 }
2468
2469                 if ( $this->doUnwatch() ) {
2470                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2471                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2472                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2473                 }
2474
2475                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2476         }
2477
2478         /**
2479          * Stop watching a page
2480          * @return bool true on successful unwatch
2481          */
2482         public function doUnwatch() {
2483                 global $wgUser;
2484
2485                 if ( $wgUser->isAnon() ) {
2486                         return false;
2487                 }
2488
2489                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2490                         $wgUser->removeWatch( $this->mTitle );
2491                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2492                 }
2493
2494                 return false;
2495         }
2496
2497         /**
2498          * action=protect handler
2499          */
2500         public function protect() {
2501                 $form = new ProtectionForm( $this );
2502                 $form->execute();
2503         }
2504
2505         /**
2506          * action=unprotect handler (alias)
2507          */
2508         public function unprotect() {
2509                 $this->protect();
2510         }
2511
2512         /**
2513          * Update the article's restriction field, and leave a log entry.
2514          *
2515          * @param $limit Array: set of restriction keys
2516          * @param $reason String
2517          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2518          * @param $expiry Array: per restriction type expiration
2519          * @return bool true on success
2520          */
2521         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2522                 global $wgUser, $wgContLang;
2523
2524                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2525
2526                 $id = $this->mTitle->getArticleID();
2527
2528                 if ( $id <= 0 ) {
2529                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
2530                         return false;
2531                 }
2532
2533                 if ( wfReadOnly() ) {
2534                         wfDebug( "updateRestrictions failed: read-only\n" );
2535                         return false;
2536                 }
2537
2538                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2539                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2540                         return false;
2541                 }
2542
2543                 if ( !$cascade ) {
2544                         $cascade = false;
2545                 }
2546
2547                 // Take this opportunity to purge out expired restrictions
2548                 Title::purgeExpiredRestrictions();
2549
2550                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2551                 # we expect a single selection, but the schema allows otherwise.
2552                 $current = array();
2553                 $updated = Article::flattenRestrictions( $limit );
2554                 $changed = false;
2555
2556                 foreach ( $restrictionTypes as $action ) {
2557                         if ( isset( $expiry[$action] ) ) {
2558                                 # Get current restrictions on $action
2559                                 $aLimits = $this->mTitle->getRestrictions( $action );
2560                                 $current[$action] = implode( '', $aLimits );
2561                                 # Are any actual restrictions being dealt with here?
2562                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2563
2564                                 # If something changed, we need to log it. Checking $aRChanged
2565                                 # assures that "unprotecting" a page that is not protected does
2566                                 # not log just because the expiry was "changed".
2567                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2568                                         $changed = true;
2569                                 }
2570                         }
2571                 }
2572
2573                 $current = Article::flattenRestrictions( $current );
2574
2575                 $changed = ( $changed || $current != $updated );
2576                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2577                 $protect = ( $updated != '' );
2578
2579                 # If nothing's changed, do nothing
2580                 if ( $changed ) {
2581                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2582                                 $dbw = wfGetDB( DB_MASTER );
2583
2584                                 # Prepare a null revision to be added to the history
2585                                 $modified = $current != '' && $protect;
2586
2587                                 if ( $protect ) {
2588                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2589                                 } else {
2590                                         $comment_type = 'unprotectedarticle';
2591                                 }
2592
2593                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2594
2595                                 # Only restrictions with the 'protect' right can cascade...
2596                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2597                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2598
2599                                 # The schema allows multiple restrictions
2600                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2601                                         $cascade = false;
2602                                 }
2603
2604                                 $cascade_description = '';
2605
2606                                 if ( $cascade ) {
2607                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2608                                 }
2609
2610                                 if ( $reason ) {
2611                                         $comment .= ": $reason";
2612                                 }
2613
2614                                 $editComment = $comment;
2615                                 $encodedExpiry = array();
2616                                 $protect_description = '';
2617                                 foreach ( $limit as $action => $restrictions ) {
2618                                         if ( !isset( $expiry[$action] ) )
2619                                                 $expiry[$action] = Block::infinity();
2620
2621                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2622                                         if ( $restrictions != '' ) {
2623                                                 $protect_description .= "[$action=$restrictions] (";
2624                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2625                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2626                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2627                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2628                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2629                                                 } else {
2630                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2631                                                 }
2632
2633                                                 $protect_description .= ') ';
2634                                         }
2635                                 }
2636                                 $protect_description = trim( $protect_description );
2637
2638                                 if ( $protect_description && $protect ) {
2639                                         $editComment .= " ($protect_description)";
2640                                 }
2641
2642                                 if ( $cascade ) {
2643                                         $editComment .= "$cascade_description";
2644                                 }
2645
2646                                 # Update restrictions table
2647                                 foreach ( $limit as $action => $restrictions ) {
2648                                         if ( $restrictions != '' ) {
2649                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2650                                                         array( 'pr_page' => $id,
2651                                                                 'pr_type' => $action,
2652                                                                 'pr_level' => $restrictions,
2653                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2654                                                                 'pr_expiry' => $encodedExpiry[$action]
2655                                                         ),
2656                                                         __METHOD__
2657                                                 );
2658                                         } else {
2659                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2660                                                         'pr_type' => $action ), __METHOD__ );
2661                                         }
2662                                 }
2663
2664                                 # Insert a null revision
2665                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2666                                 $nullRevId = $nullRevision->insertOn( $dbw );
2667
2668                                 $latest = $this->getLatest();
2669                                 # Update page record
2670                                 $dbw->update( 'page',
2671                                         array( /* SET */
2672                                                 'page_touched' => $dbw->timestamp(),
2673                                                 'page_restrictions' => '',
2674                                                 'page_latest' => $nullRevId
2675                                         ), array( /* WHERE */
2676                                                 'page_id' => $id
2677                                         ), 'Article::protect'
2678                                 );
2679
2680                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2681                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2682
2683                                 # Update the protection log
2684                                 $log = new LogPage( 'protect' );
2685                                 if ( $protect ) {
2686                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2687                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2688                                 } else {
2689                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2690                                 }
2691                         } # End hook
2692                 } # End "changed" check
2693
2694                 return true;
2695         }
2696
2697         /**
2698          * Take an array of page restrictions and flatten it to a string
2699          * suitable for insertion into the page_restrictions field.
2700          * @param $limit Array
2701          * @return String
2702          */
2703         protected static function flattenRestrictions( $limit ) {
2704                 if ( !is_array( $limit ) ) {
2705                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2706                 }
2707
2708                 $bits = array();
2709                 ksort( $limit );
2710
2711                 foreach ( $limit as $action => $restrictions ) {
2712                         if ( $restrictions != '' ) {
2713                                 $bits[] = "$action=$restrictions";
2714                         }
2715                 }
2716
2717                 return implode( ':', $bits );
2718         }
2719
2720         /**
2721          * Auto-generates a deletion reason
2722          *
2723          * @param &$hasHistory Boolean: whether the page has a history
2724          * @return mixed String containing deletion reason or empty string, or boolean false
2725          *    if no revision occurred
2726          */
2727         public function generateReason( &$hasHistory ) {
2728                 global $wgContLang;
2729
2730                 $dbw = wfGetDB( DB_MASTER );
2731                 // Get the last revision
2732                 $rev = Revision::newFromTitle( $this->mTitle );
2733
2734                 if ( is_null( $rev ) ) {
2735                         return false;
2736                 }
2737
2738                 // Get the article's contents
2739                 $contents = $rev->getText();
2740                 $blank = false;
2741
2742                 // If the page is blank, use the text from the previous revision,
2743                 // which can only be blank if there's a move/import/protect dummy revision involved
2744                 if ( $contents == '' ) {
2745                         $prev = $rev->getPrevious();
2746
2747                         if ( $prev )    {
2748                                 $contents = $prev->getText();
2749                                 $blank = true;
2750                         }
2751                 }
2752
2753                 // Find out if there was only one contributor
2754                 // Only scan the last 20 revisions
2755                 $res = $dbw->select( 'revision', 'rev_user_text',
2756                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2757                         __METHOD__,
2758                         array( 'LIMIT' => 20 )
2759                 );
2760
2761                 if ( $res === false ) {
2762                         // This page has no revisions, which is very weird
2763                         return false;
2764                 }
2765
2766                 $hasHistory = ( $res->numRows() > 1 );
2767                 $row = $dbw->fetchObject( $res );
2768
2769                 if ( $row ) { // $row is false if the only contributor is hidden
2770                         $onlyAuthor = $row->rev_user_text;
2771                         // Try to find a second contributor
2772                         foreach ( $res as $row ) {
2773                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2774                                         $onlyAuthor = false;
2775                                         break;
2776                                 }
2777                         }
2778                 } else {
2779                         $onlyAuthor = false;
2780                 }
2781
2782                 // Generate the summary with a '$1' placeholder
2783                 if ( $blank ) {
2784                         // The current revision is blank and the one before is also
2785                         // blank. It's just not our lucky day
2786                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2787                 } else {
2788                         if ( $onlyAuthor ) {
2789                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2790                         } else {
2791                                 $reason = wfMsgForContent( 'excontent', '$1' );
2792                         }
2793                 }
2794
2795                 if ( $reason == '-' ) {
2796                         // Allow these UI messages to be blanked out cleanly
2797                         return '';
2798                 }
2799
2800                 // Replace newlines with spaces to prevent uglyness
2801                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2802                 // Calculate the maximum amount of chars to get
2803                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2804                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2805                 $contents = $wgContLang->truncate( $contents, $maxLength );
2806                 // Remove possible unfinished links
2807                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2808                 // Now replace the '$1' placeholder
2809                 $reason = str_replace( '$1', $contents, $reason );
2810
2811                 return $reason;
2812         }
2813
2814
2815         /*
2816          * UI entry point for page deletion
2817          */
2818         public function delete() {
2819                 global $wgUser, $wgOut, $wgRequest;
2820
2821                 $confirm = $wgRequest->wasPosted() &&
2822                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2823
2824                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2825                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2826
2827                 $reason = $this->DeleteReasonList;
2828
2829                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2830                         // Entry from drop down menu + additional comment
2831                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2832                 } elseif ( $reason == 'other' ) {
2833                         $reason = $this->DeleteReason;
2834                 }
2835
2836                 # Flag to hide all contents of the archived revisions
2837                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2838
2839                 # This code desperately needs to be totally rewritten
2840
2841                 # Read-only check...
2842                 if ( wfReadOnly() ) {
2843                         $wgOut->readOnlyPage();
2844
2845                         return;
2846                 }
2847
2848                 # Check permissions
2849                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2850
2851                 if ( count( $permission_errors ) > 0 ) {
2852                         $wgOut->showPermissionsErrorPage( $permission_errors );
2853
2854                         return;
2855                 }
2856
2857                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2858
2859                 # Better double-check that it hasn't been deleted yet!
2860                 $dbw = wfGetDB( DB_MASTER );
2861                 $conds = $this->mTitle->pageCond();
2862                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2863                 if ( $latest === false ) {
2864                         $wgOut->showFatalError(
2865                                 Html::rawElement(
2866                                         'div',
2867                                         array( 'class' => 'error mw-error-cannotdelete' ),
2868                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2869                                 )
2870                         );
2871                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2872                         LogEventsList::showLogExtract(
2873                                 $wgOut,
2874                                 'delete',
2875                                 $this->mTitle->getPrefixedText()
2876                         );
2877
2878                         return;
2879                 }
2880
2881                 # Hack for big sites
2882                 $bigHistory = $this->isBigDeletion();
2883                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2884                         global $wgLang, $wgDeleteRevisionsLimit;
2885
2886                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2887                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2888
2889                         return;
2890                 }
2891
2892                 if ( $confirm ) {
2893                         $this->doDelete( $reason, $suppress );
2894
2895                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2896                                 $this->doWatch();
2897                         } elseif ( $this->mTitle->userIsWatching() ) {
2898                                 $this->doUnwatch();
2899                         }
2900
2901                         return;
2902                 }
2903
2904                 // Generate deletion reason
2905                 $hasHistory = false;
2906                 if ( !$reason ) {
2907                         $reason = $this->generateReason( $hasHistory );
2908                 }
2909
2910                 // If the page has a history, insert a warning
2911                 if ( $hasHistory && !$confirm ) {
2912                         global $wgLang;
2913
2914                         $skin = $wgUser->getSkin();
2915                         $revisions = $this->estimateRevisionCount();
2916                         //FIXME: lego
2917                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2918                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2919                                 wfMsgHtml( 'word-separator' ) . $skin->link( $this->mTitle,
2920                                         wfMsgHtml( 'history' ),
2921                                         array( 'rel' => 'archives' ),
2922                                         array( 'action' => 'history' ) ) .
2923                                 '</strong>'
2924                         );
2925
2926                         if ( $bigHistory ) {
2927                                 global $wgDeleteRevisionsLimit;
2928                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2929                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2930                         }
2931                 }
2932
2933                 return $this->confirmDelete( $reason );
2934         }
2935
2936         /**
2937          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2938          */
2939         public function isBigDeletion() {
2940                 global $wgDeleteRevisionsLimit;
2941
2942                 if ( $wgDeleteRevisionsLimit ) {
2943                         $revCount = $this->estimateRevisionCount();
2944
2945                         return $revCount > $wgDeleteRevisionsLimit;
2946                 }
2947
2948                 return false;
2949         }
2950
2951         /**
2952          * @return int approximate revision count
2953          */
2954         public function estimateRevisionCount() {
2955                 $dbr = wfGetDB( DB_SLAVE );
2956
2957                 // For an exact count...
2958                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2959                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2960                 return $dbr->estimateRowCount( 'revision', '*',
2961                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2962         }
2963
2964         /**
2965          * Get the last N authors
2966          * @param $num Integer: number of revisions to get
2967          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2968          * @return array Array of authors, duplicates not removed
2969          */
2970         public function getLastNAuthors( $num, $revLatest = 0 ) {
2971                 wfProfileIn( __METHOD__ );
2972                 // First try the slave
2973                 // If that doesn't have the latest revision, try the master
2974                 $continue = 2;
2975                 $db = wfGetDB( DB_SLAVE );
2976
2977                 do {
2978                         $res = $db->select( array( 'page', 'revision' ),
2979                                 array( 'rev_id', 'rev_user_text' ),
2980                                 array(
2981                                         'page_namespace' => $this->mTitle->getNamespace(),
2982                                         'page_title' => $this->mTitle->getDBkey(),
2983                                         'rev_page = page_id'
2984                                 ), __METHOD__, $this->getSelectOptions( array(
2985                                         'ORDER BY' => 'rev_timestamp DESC',
2986                                         'LIMIT' => $num
2987                                 ) )
2988                         );
2989
2990                         if ( !$res ) {
2991                                 wfProfileOut( __METHOD__ );
2992                                 return array();
2993                         }
2994
2995                         $row = $db->fetchObject( $res );
2996
2997                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2998                                 $db = wfGetDB( DB_MASTER );
2999                                 $continue--;
3000                         } else {
3001                                 $continue = 0;
3002                         }
3003                 } while ( $continue );
3004
3005                 $authors = array( $row->rev_user_text );
3006
3007                 foreach ( $res as $row ) {
3008                         $authors[] = $row->rev_user_text;
3009                 }
3010
3011                 wfProfileOut( __METHOD__ );
3012                 return $authors;
3013         }
3014
3015         /**
3016          * Output deletion confirmation dialog
3017          * FIXME: Move to another file?
3018          * @param $reason String: prefilled reason
3019          */
3020         public function confirmDelete( $reason ) {
3021                 global $wgOut, $wgUser;
3022
3023                 wfDebug( "Article::confirmDelete\n" );
3024
3025                 $deleteBackLink = $wgUser->getSkin()->linkKnown( $this->mTitle );
3026                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
3027                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3028                 $wgOut->addWikiMsg( 'confirmdeletetext' );
3029
3030                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
3031
3032                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
3033                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
3034                                         <td></td>
3035                                         <td class='mw-input'><strong>" .
3036                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
3037                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
3038                                         "</strong></td>
3039                                 </tr>";
3040                 } else {
3041                         $suppress = '';
3042                 }
3043                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3044
3045                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3046                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3047                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3048                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3049                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3050                         "<tr id=\"wpDeleteReasonListRow\">
3051                                 <td class='mw-label'>" .
3052                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3053                                 "</td>
3054                                 <td class='mw-input'>" .
3055                                         Xml::listDropDown( 'wpDeleteReasonList',
3056                                                 wfMsgForContent( 'deletereason-dropdown' ),
3057                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3058                                 "</td>
3059                         </tr>
3060                         <tr id=\"wpDeleteReasonRow\">
3061                                 <td class='mw-label'>" .
3062                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3063                                 "</td>
3064                                 <td class='mw-input'>" .
3065                                 Html::input( 'wpReason', $reason, 'text', array(
3066                                         'size' => '60',
3067                                         'maxlength' => '255',
3068                                         'tabindex' => '2',
3069                                         'id' => 'wpReason',
3070                                         'autofocus'
3071                                 ) ) .
3072                                 "</td>
3073                         </tr>";
3074
3075                 # Disallow watching if user is not logged in
3076                 if ( $wgUser->isLoggedIn() ) {
3077                         $form .= "
3078                         <tr>
3079                                 <td></td>
3080                                 <td class='mw-input'>" .
3081                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3082                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3083                                 "</td>
3084                         </tr>";
3085                 }
3086
3087                 $form .= "
3088                         $suppress
3089                         <tr>
3090                                 <td></td>
3091                                 <td class='mw-submit'>" .
3092                                         Xml::submitButton( wfMsg( 'deletepage' ),
3093                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3094                                 "</td>
3095                         </tr>" .
3096                         Xml::closeElement( 'table' ) .
3097                         Xml::closeElement( 'fieldset' ) .
3098                         Html::hidden( 'wpEditToken', $wgUser->editToken() ) .
3099                         Xml::closeElement( 'form' );
3100
3101                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
3102                                 $skin = $wgUser->getSkin();
3103                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3104                                 $link = $skin->link(
3105                                         $title,
3106                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3107                                         array(),
3108                                         array( 'action' => 'edit' )
3109                                 );
3110                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3111                         }
3112
3113                 $wgOut->addHTML( $form );
3114                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3115                 LogEventsList::showLogExtract( $wgOut, 'delete',
3116                         $this->mTitle->getPrefixedText()
3117                 );
3118         }
3119
3120         /**
3121          * Perform a deletion and output success or failure messages
3122          */
3123         public function doDelete( $reason, $suppress = false ) {
3124                 global $wgOut, $wgUser;
3125
3126                 $id = $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3127
3128                 $error = '';
3129                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3130                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
3131                                 $deleted = $this->mTitle->getPrefixedText();
3132
3133                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3134                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3135
3136                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3137
3138                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3139                                 $wgOut->returnToMain( false );
3140                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3141                         }
3142                 } else {
3143                         if ( $error == '' ) {
3144                                 $wgOut->showFatalError(
3145                                         Html::rawElement(
3146                                                 'div',
3147                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3148                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3149                                         )
3150                                 );
3151
3152                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3153
3154                                 LogEventsList::showLogExtract(
3155                                         $wgOut,
3156                                         'delete',
3157                                         $this->mTitle->getPrefixedText()
3158                                 );
3159                         } else {
3160                                 $wgOut->showFatalError( $error );
3161                         }
3162                 }
3163         }
3164
3165         /**
3166          * Back-end article deletion
3167          * Deletes the article with database consistency, writes logs, purges caches
3168          *
3169          * @param $reason string delete reason for deletion log
3170          * @param suppress bitfield
3171          *      Revision::DELETED_TEXT
3172          *      Revision::DELETED_COMMENT
3173          *      Revision::DELETED_USER
3174          *      Revision::DELETED_RESTRICTED
3175          * @param $id int article ID
3176          * @param $commit boolean defaults to true, triggers transaction end
3177          * @return boolean true if successful
3178          */
3179         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
3180                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3181
3182                 wfDebug( __METHOD__ . "\n" );
3183
3184                 $dbw = wfGetDB( DB_MASTER );
3185                 $t = $this->mTitle->getDBkey();
3186                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3187
3188                 if ( $t === '' || $id == 0 ) {
3189                         return false;
3190                 }
3191
3192                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3193                 array_push( $wgDeferredUpdateList, $u );
3194
3195                 // Bitfields to further suppress the content
3196                 if ( $suppress ) {
3197                         $bitfield = 0;
3198                         // This should be 15...
3199                         $bitfield |= Revision::DELETED_TEXT;
3200                         $bitfield |= Revision::DELETED_COMMENT;
3201                         $bitfield |= Revision::DELETED_USER;
3202                         $bitfield |= Revision::DELETED_RESTRICTED;
3203                 } else {
3204                         $bitfield = 'rev_deleted';
3205                 }
3206
3207                 $dbw->begin();
3208                 // For now, shunt the revision data into the archive table.
3209                 // Text is *not* removed from the text table; bulk storage
3210                 // is left intact to avoid breaking block-compression or
3211                 // immutable storage schemes.
3212                 //
3213                 // For backwards compatibility, note that some older archive
3214                 // table entries will have ar_text and ar_flags fields still.
3215                 //
3216                 // In the future, we may keep revisions and mark them with
3217                 // the rev_deleted field, which is reserved for this purpose.
3218                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3219                         array(
3220                                 'ar_namespace'  => 'page_namespace',
3221                                 'ar_title'      => 'page_title',
3222                                 'ar_comment'    => 'rev_comment',
3223                                 'ar_user'       => 'rev_user',
3224                                 'ar_user_text'  => 'rev_user_text',
3225                                 'ar_timestamp'  => 'rev_timestamp',
3226                                 'ar_minor_edit' => 'rev_minor_edit',
3227                                 'ar_rev_id'     => 'rev_id',
3228                                 'ar_text_id'    => 'rev_text_id',
3229                                 'ar_text'       => '\'\'', // Be explicit to appease
3230                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3231                                 'ar_len'        => 'rev_len',
3232                                 'ar_page_id'    => 'page_id',
3233                                 'ar_deleted'    => $bitfield
3234                         ), array(
3235                                 'page_id' => $id,
3236                                 'page_id = rev_page'
3237                         ), __METHOD__
3238                 );
3239
3240                 # Delete restrictions for it
3241                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3242
3243                 # Now that it's safely backed up, delete it
3244                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3245                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3246
3247                 if ( !$ok ) {
3248                         $dbw->rollback();
3249                         return false;
3250                 }
3251
3252                 # Fix category table counts
3253                 $cats = array();
3254                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3255
3256                 foreach ( $res as $row ) {
3257                         $cats [] = $row->cl_to;
3258                 }
3259
3260                 $this->updateCategoryCounts( array(), $cats );
3261
3262                 # If using cascading deletes, we can skip some explicit deletes
3263                 if ( !$dbw->cascadingDeletes() ) {
3264                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3265
3266                         if ( $wgUseTrackbacks )
3267                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3268
3269                         # Delete outgoing links
3270                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3271                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3272                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3273                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3274                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3275                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3276                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3277                 }
3278
3279                 # If using cleanup triggers, we can skip some manual deletes
3280                 if ( !$dbw->cleanupTriggers() ) {
3281                         # Clean up recentchanges entries...
3282                         $dbw->delete( 'recentchanges',
3283                                 array( 'rc_type != ' . RC_LOG,
3284                                         'rc_namespace' => $this->mTitle->getNamespace(),
3285                                         'rc_title' => $this->mTitle->getDBkey() ),
3286                                 __METHOD__ );
3287                         $dbw->delete( 'recentchanges',
3288                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3289                                 __METHOD__ );
3290                 }
3291
3292                 # Clear caches
3293                 Article::onArticleDelete( $this->mTitle );
3294
3295                 # Clear the cached article id so the interface doesn't act like we exist
3296                 $this->mTitle->resetArticleID( 0 );
3297
3298                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3299                 $logtype = $suppress ? 'suppress' : 'delete';
3300                 $log = new LogPage( $logtype );
3301
3302                 # Make sure logging got through
3303                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3304
3305                 if ( $commit ) {
3306                         $dbw->commit();
3307                 }
3308
3309                 return true;
3310         }
3311
3312         /**
3313          * Roll back the most recent consecutive set of edits to a page
3314          * from the same user; fails if there are no eligible edits to
3315          * roll back to, e.g. user is the sole contributor. This function
3316          * performs permissions checks on $wgUser, then calls commitRollback()
3317          * to do the dirty work
3318          *
3319          * @param $fromP String: Name of the user whose edits to rollback.
3320          * @param $summary String: Custom summary. Set to default summary if empty.
3321          * @param $token String: Rollback token.
3322          * @param $bot Boolean: If true, mark all reverted edits as bot.
3323          *
3324          * @param $resultDetails Array: contains result-specific array of additional values
3325          *    'alreadyrolled' : 'current' (rev)
3326          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3327          *
3328          * @return array of errors, each error formatted as
3329          *   array(messagekey, param1, param2, ...).
3330          * On success, the array is empty.  This array can also be passed to
3331          * OutputPage::showPermissionsErrorPage().
3332          */
3333         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3334                 global $wgUser;
3335
3336                 $resultDetails = null;
3337
3338                 # Check permissions
3339                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3340                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3341                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3342
3343                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3344                         $errors[] = array( 'sessionfailure' );
3345                 }
3346
3347                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3348                         $errors[] = array( 'actionthrottledtext' );
3349                 }
3350
3351                 # If there were errors, bail out now
3352                 if ( !empty( $errors ) ) {
3353                         return $errors;
3354                 }
3355
3356                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3357         }
3358
3359         /**
3360          * Backend implementation of doRollback(), please refer there for parameter
3361          * and return value documentation
3362          *
3363          * NOTE: This function does NOT check ANY permissions, it just commits the
3364          * rollback to the DB Therefore, you should only call this function direct-
3365          * ly if you want to use custom permissions checks. If you don't, use
3366          * doRollback() instead.
3367          */
3368         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3369                 global $wgUseRCPatrol, $wgUser, $wgLang;
3370
3371                 $dbw = wfGetDB( DB_MASTER );
3372
3373                 if ( wfReadOnly() ) {
3374                         return array( array( 'readonlytext' ) );
3375                 }
3376
3377                 # Get the last editor
3378                 $current = Revision::newFromTitle( $this->mTitle );
3379                 if ( is_null( $current ) ) {
3380                         # Something wrong... no page?
3381                         return array( array( 'notanarticle' ) );
3382                 }
3383
3384                 $from = str_replace( '_', ' ', $fromP );
3385                 # User name given should match up with the top revision.
3386                 # If the user was deleted then $from should be empty.
3387                 if ( $from != $current->getUserText() ) {
3388                         $resultDetails = array( 'current' => $current );
3389                         return array( array( 'alreadyrolled',
3390                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3391                                 htmlspecialchars( $fromP ),
3392                                 htmlspecialchars( $current->getUserText() )
3393                         ) );
3394                 }
3395
3396                 # Get the last edit not by this guy...
3397                 # Note: these may not be public values
3398                 $user = intval( $current->getRawUser() );
3399                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3400                 $s = $dbw->selectRow( 'revision',
3401                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3402                         array( 'rev_page' => $current->getPage(),
3403                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3404                         ), __METHOD__,
3405                         array( 'USE INDEX' => 'page_timestamp',
3406                                 'ORDER BY' => 'rev_timestamp DESC' )
3407                         );
3408                 if ( $s === false ) {
3409                         # No one else ever edited this page
3410                         return array( array( 'cantrollback' ) );
3411                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3412                         # Only admins can see this text
3413                         return array( array( 'notvisiblerev' ) );
3414                 }
3415
3416                 $set = array();
3417                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3418                         # Mark all reverted edits as bot
3419                         $set['rc_bot'] = 1;
3420                 }
3421
3422                 if ( $wgUseRCPatrol ) {
3423                         # Mark all reverted edits as patrolled
3424                         $set['rc_patrolled'] = 1;
3425                 }
3426
3427                 if ( count( $set ) ) {
3428                         $dbw->update( 'recentchanges', $set,
3429                                 array( /* WHERE */
3430                                         'rc_cur_id' => $current->getPage(),
3431                                         'rc_user_text' => $current->getUserText(),
3432                                         "rc_timestamp > '{$s->rev_timestamp}'",
3433                                 ), __METHOD__
3434                         );
3435                 }
3436
3437                 # Generate the edit summary if necessary
3438                 $target = Revision::newFromId( $s->rev_id );
3439                 if ( empty( $summary ) ) {
3440                         if ( $from == '' ) { // no public user name
3441                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3442                         } else {
3443                                 $summary = wfMsgForContent( 'revertpage' );
3444                         }
3445                 }
3446
3447                 # Allow the custom summary to use the same args as the default message
3448                 $args = array(
3449                         $target->getUserText(), $from, $s->rev_id,
3450                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3451                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3452                 );
3453                 $summary = wfMsgReplaceArgs( $summary, $args );
3454
3455                 # Save
3456                 $flags = EDIT_UPDATE;
3457
3458                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3459                         $flags |= EDIT_MINOR;
3460                 }
3461
3462                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) ) {
3463                         $flags |= EDIT_FORCE_BOT;
3464                 }
3465
3466                 # Actually store the edit
3467                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3468                 if ( !empty( $status->value['revision'] ) ) {
3469                         $revId = $status->value['revision']->getId();
3470                 } else {
3471                         $revId = false;
3472                 }
3473
3474                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3475
3476                 $resultDetails = array(
3477                         'summary' => $summary,
3478                         'current' => $current,
3479                         'target'  => $target,
3480                         'newid'   => $revId
3481                 );
3482
3483                 return array();
3484         }
3485
3486         /**
3487          * User interface for rollback operations
3488          */
3489         public function rollback() {
3490                 global $wgUser, $wgOut, $wgRequest;
3491
3492                 $details = null;
3493
3494                 $result = $this->doRollback(
3495                         $wgRequest->getVal( 'from' ),
3496                         $wgRequest->getText( 'summary' ),
3497                         $wgRequest->getVal( 'token' ),
3498                         $wgRequest->getBool( 'bot' ),
3499                         $details
3500                 );
3501
3502                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3503                         $wgOut->rateLimited();
3504                         return;
3505                 }
3506
3507                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3508                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3509                         $errArray = $result[0];
3510                         $errMsg = array_shift( $errArray );
3511                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3512
3513                         if ( isset( $details['current'] ) ) {
3514                                 $current = $details['current'];
3515
3516                                 if ( $current->getComment() != '' ) {
3517                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3518                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3519                                 }
3520                         }
3521
3522                         return;
3523                 }
3524
3525                 # Display permissions errors before read-only message -- there's no
3526                 # point in misleading the user into thinking the inability to rollback
3527                 # is only temporary.
3528                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3529                         # array_diff is completely broken for arrays of arrays, sigh.
3530                         # Remove any 'readonlytext' error manually.
3531                         $out = array();
3532                         foreach ( $result as $error ) {
3533                                 if ( $error != array( 'readonlytext' ) ) {
3534                                         $out [] = $error;
3535                                 }
3536                         }
3537                         $wgOut->showPermissionsErrorPage( $out );
3538
3539                         return;
3540                 }
3541
3542                 if ( $result == array( array( 'readonlytext' ) ) ) {
3543                         $wgOut->readOnlyPage();
3544
3545                         return;
3546                 }
3547
3548                 $current = $details['current'];
3549                 $target = $details['target'];
3550                 $newId = $details['newid'];
3551                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3552                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3553
3554                 if ( $current->getUserText() === '' ) {
3555                         $old = wfMsg( 'rev-deleted-user' );
3556                 } else {
3557                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3558                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3559                 }
3560
3561                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3562                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3563                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3564                 $wgOut->returnToMain( false, $this->mTitle );
3565
3566                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3567                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3568                         $de->showDiff( '', '' );
3569                 }
3570         }
3571
3572         /**
3573          * Do standard deferred updates after page view
3574          */
3575         public function viewUpdates() {
3576                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3577                 if ( wfReadOnly() ) {
3578                         return;
3579                 }
3580
3581                 # Don't update page view counters on views from bot users (bug 14044)
3582                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3583                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
3584                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
3585                 }
3586
3587                 # Update newtalk / watchlist notification status
3588                 $wgUser->clearNotification( $this->mTitle );
3589         }
3590
3591         /**
3592          * Prepare text which is about to be saved.
3593          * Returns a stdclass with source, pst and output members
3594          */
3595         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
3596                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3597                         // Already prepared
3598                         return $this->mPreparedEdit;
3599                 }
3600
3601                 global $wgParser;
3602
3603                 if( $user === null ) {
3604                         global $wgUser;
3605                         $user = $wgUser;
3606                 }
3607                 $popts = ParserOptions::newFromUser( $user );
3608                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
3609
3610                 $edit = (object)array();
3611                 $edit->revid = $revid;
3612                 $edit->newText = $text;
3613                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
3614                 $edit->popts = $this->getParserOptions( true );
3615                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3616                 $edit->oldText = $this->getRawText();
3617
3618                 $this->mPreparedEdit = $edit;
3619
3620                 return $edit;
3621         }
3622
3623         /**
3624          * Do standard deferred updates after page edit.
3625          * Update links tables, site stats, search index and message cache.
3626          * Purges pages that include this page if the text was changed here.
3627          * Every 100th edit, prune the recent changes table.
3628          *
3629          * @private
3630          * @param $text String: New text of the article
3631          * @param $summary String: Edit summary
3632          * @param $minoredit Boolean: Minor edit
3633          * @param $timestamp_of_pagechange String timestamp associated with the page change
3634          * @param $newid Integer: rev_id value of the new revision
3635          * @param $changed Boolean: Whether or not the content actually changed
3636          * @param $user User object: User doing the edit
3637          */
3638         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true, User $user = null ) {
3639                 global $wgDeferredUpdateList, $wgUser, $wgEnableParserCache;
3640
3641                 wfProfileIn( __METHOD__ );
3642
3643                 # Parse the text
3644                 # Be careful not to double-PST: $text is usually already PST-ed once
3645                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3646                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3647                         $editInfo = $this->prepareTextForEdit( $text, $newid, $user );
3648                 } else {
3649                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3650                         $editInfo = $this->mPreparedEdit;
3651                 }
3652
3653                 # Save it to the parser cache
3654                 if ( $wgEnableParserCache ) {
3655                         $parserCache = ParserCache::singleton();
3656                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3657                 }
3658
3659                 # Update the links tables
3660                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3661                 $u->doUpdate();
3662
3663                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3664
3665                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3666                         if ( 0 == mt_rand( 0, 99 ) ) {
3667                                 // Flush old entries from the `recentchanges` table; we do this on
3668                                 // random requests so as to avoid an increase in writes for no good reason
3669                                 global $wgRCMaxAge;
3670
3671                                 $dbw = wfGetDB( DB_MASTER );
3672                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3673                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3674                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3675
3676                                 $dbw->query( $sql );
3677                         }
3678                 }
3679
3680                 $id = $this->getID();
3681                 $title = $this->mTitle->getPrefixedDBkey();
3682                 $shortTitle = $this->mTitle->getDBkey();
3683
3684                 if ( 0 == $id ) {
3685                         wfProfileOut( __METHOD__ );
3686                         return;
3687                 }
3688
3689                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3690                 array_push( $wgDeferredUpdateList, $u );
3691                 $u = new SearchUpdate( $id, $title, $text );
3692                 array_push( $wgDeferredUpdateList, $u );
3693
3694                 # If this is another user's talk page, update newtalk
3695                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3696                 # load of user talk pages and piss people off, nor if it's a minor edit
3697                 # by a properly-flagged bot.
3698                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3699                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3700                 ) {
3701                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3702                                 $other = User::newFromName( $shortTitle, false );
3703                                 if ( !$other ) {
3704                                         wfDebug( __METHOD__ . ": invalid username\n" );
3705                                 } elseif ( User::isIP( $shortTitle ) ) {
3706                                         // An anonymous user
3707                                         $other->setNewtalk( true );
3708                                 } elseif ( $other->isLoggedIn() ) {
3709                                         $other->setNewtalk( true );
3710                                 } else {
3711                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3712                                 }
3713                         }
3714                 }
3715
3716                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3717                         MessageCache::singleton()->replace( $shortTitle, $text );
3718                 }
3719
3720                 wfProfileOut( __METHOD__ );
3721         }
3722
3723         /**
3724          * Perform article updates on a special page creation.
3725          *
3726          * @param $rev Revision object
3727          *
3728          * @todo This is a shitty interface function. Kill it and replace the
3729          * other shitty functions like editUpdates and such so it's not needed
3730          * anymore.
3731          */
3732         public function createUpdates( $rev ) {
3733                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3734                 $this->mTotalAdjustment = 1;
3735                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3736                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3737         }
3738
3739         /**
3740          * Generate the navigation links when browsing through an article revisions
3741          * It shows the information as:
3742          *   Revision as of \<date\>; view current revision
3743          *   \<- Previous version | Next Version -\>
3744          *
3745          * @param $oldid String: revision ID of this article revision
3746          */
3747         public function setOldSubtitle( $oldid = 0 ) {
3748                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3749
3750                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3751                         return;
3752                 }
3753
3754                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3755
3756                 # Cascade unhide param in links for easy deletion browsing
3757                 $extraParams = array();
3758                 if ( $wgRequest->getVal( 'unhide' ) ) {
3759                         $extraParams['unhide'] = 1;
3760                 }
3761
3762                 $revision = Revision::newFromId( $oldid );
3763
3764                 $current = ( $oldid == $this->mLatest );
3765                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3766                 $tddate = $wgLang->date( $this->mTimestamp, true );
3767                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3768                 $sk = $wgUser->getSkin();
3769                 $lnk = $current
3770                         ? wfMsgHtml( 'currentrevisionlink' )
3771                         : $sk->link(
3772                                 $this->mTitle,
3773                                 wfMsgHtml( 'currentrevisionlink' ),
3774                                 array(),
3775                                 $extraParams,
3776                                 array( 'known', 'noclasses' )
3777                         );
3778                 $curdiff = $current
3779                         ? wfMsgHtml( 'diff' )
3780                         : $sk->link(
3781                                 $this->mTitle,
3782                                 wfMsgHtml( 'diff' ),
3783                                 array(),
3784                                 array(
3785                                         'diff' => 'cur',
3786                                         'oldid' => $oldid
3787                                 ) + $extraParams,
3788                                 array( 'known', 'noclasses' )
3789                         );
3790                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3791                 $prevlink = $prev
3792                         ? $sk->link(
3793                                 $this->mTitle,
3794                                 wfMsgHtml( 'previousrevision' ),
3795                                 array(),
3796                                 array(
3797                                         'direction' => 'prev',
3798                                         'oldid' => $oldid
3799                                 ) + $extraParams,
3800                                 array( 'known', 'noclasses' )
3801                         )
3802                         : wfMsgHtml( 'previousrevision' );
3803                 $prevdiff = $prev
3804                         ? $sk->link(
3805                                 $this->mTitle,
3806                                 wfMsgHtml( 'diff' ),
3807                                 array(),
3808                                 array(
3809                                         'diff' => 'prev',
3810                                         'oldid' => $oldid
3811                                 ) + $extraParams,
3812                                 array( 'known', 'noclasses' )
3813                         )
3814                         : wfMsgHtml( 'diff' );
3815                 $nextlink = $current
3816                         ? wfMsgHtml( 'nextrevision' )
3817                         : $sk->link(
3818                                 $this->mTitle,
3819                                 wfMsgHtml( 'nextrevision' ),
3820                                 array(),
3821                                 array(
3822                                         'direction' => 'next',
3823                                         'oldid' => $oldid
3824                                 ) + $extraParams,
3825                                 array( 'known', 'noclasses' )
3826                         );
3827                 $nextdiff = $current
3828                         ? wfMsgHtml( 'diff' )
3829                         : $sk->link(
3830                                 $this->mTitle,
3831                                 wfMsgHtml( 'diff' ),
3832                                 array(),
3833                                 array(
3834                                         'diff' => 'next',
3835                                         'oldid' => $oldid
3836                                 ) + $extraParams,
3837                                 array( 'known', 'noclasses' )
3838                         );
3839
3840                 $cdel = '';
3841
3842                 // User can delete revisions or view deleted revisions...
3843                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3844                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3845                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3846                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3847                         } else {
3848                                 $query = array(
3849                                         'type'   => 'revision',
3850                                         'target' => $this->mTitle->getPrefixedDbkey(),
3851                                         'ids'    => $oldid
3852                                 );
3853                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3854                         }
3855                         $cdel .= ' ';
3856                 }
3857
3858                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3859                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3860
3861                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
3862                         ? 'revision-info-current'
3863                         : 'revision-info';
3864
3865                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3866                         wfMsgExt(
3867                                 $infomsg,
3868                                 array( 'parseinline', 'replaceafter' ),
3869                                 $td,
3870                                 $userlinks,
3871                                 $revision->getID(),
3872                                 $tddate,
3873                                 $tdtime,
3874                                 $revision->getUser()
3875                         ) .
3876                         "</div>\n" .
3877                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3878                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3879
3880                 $wgOut->setSubtitle( $r );
3881         }
3882
3883         /**
3884          * This function is called right before saving the wikitext,
3885          * so we can do things like signatures and links-in-context.
3886          *
3887          * @param $text String article contents
3888          * @param $user User object: user doing the edit, $wgUser will be used if
3889          *              null is given
3890          * @param $popts ParserOptions object: parser options, default options for
3891          *               the user loaded if null given
3892          * @return string article contents with altered wikitext markup (signatures
3893          *      converted, {{subst:}}, templates, etc.)
3894          */
3895         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3896                 global $wgParser;
3897
3898                 if ( $user === null ) {
3899                         global $wgUser;
3900                         $user = $wgUser;
3901                 }
3902
3903                 if ( $popts === null ) {
3904                         $popts = ParserOptions::newFromUser( $user );
3905                 }
3906
3907                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3908         }
3909
3910         /* Caching functions */
3911
3912         /**
3913          * checkLastModified returns true if it has taken care of all
3914          * output to the client that is necessary for this request.
3915          * (that is, it has sent a cached version of the page)
3916          *
3917          * @return boolean true if cached version send, false otherwise
3918          */
3919         protected function tryFileCache() {
3920                 static $called = false;
3921
3922                 if ( $called ) {
3923                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3924                         return false;
3925                 }
3926
3927                 $called = true;
3928                 if ( $this->isFileCacheable() ) {
3929                         $cache = new HTMLFileCache( $this->mTitle );
3930                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3931                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3932                                 $cache->loadFromFileCache();
3933                                 return true;
3934                         } else {
3935                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3936                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3937                         }
3938                 } else {
3939                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3940                 }
3941
3942                 return false;
3943         }
3944
3945         /**
3946          * Check if the page can be cached
3947          * @return bool
3948          */
3949         public function isFileCacheable() {
3950                 $cacheable = false;
3951
3952                 if ( HTMLFileCache::useFileCache() ) {
3953                         $cacheable = $this->getID() && !$this->mRedirectedFrom && !$this->mTitle->isRedirect();
3954                         // Extension may have reason to disable file caching on some pages.
3955                         if ( $cacheable ) {
3956                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3957                         }
3958                 }
3959
3960                 return $cacheable;
3961         }
3962
3963         /**
3964          * Loads page_touched and returns a value indicating if it should be used
3965          * @return boolean true if not a redirect
3966          */
3967         public function checkTouched() {
3968                 if ( !$this->mDataLoaded ) {
3969                         $this->loadPageData();
3970                 }
3971
3972                 return !$this->mIsRedirect;
3973         }
3974
3975         /**
3976          * Get the page_touched field
3977          * @return string containing GMT timestamp
3978          */
3979         public function getTouched() {
3980                 if ( !$this->mDataLoaded ) {
3981                         $this->loadPageData();
3982                 }
3983
3984                 return $this->mTouched;
3985         }
3986
3987         /**
3988          * Get the page_latest field
3989          * @return integer rev_id of current revision
3990          */
3991         public function getLatest() {
3992                 if ( !$this->mDataLoaded ) {
3993                         $this->loadPageData();
3994                 }
3995
3996                 return (int)$this->mLatest;
3997         }
3998
3999         /**
4000          * Edit an article without doing all that other stuff
4001          * The article must already exist; link tables etc
4002          * are not updated, caches are not flushed.
4003          *
4004          * @param $text String: text submitted
4005          * @param $comment String: comment submitted
4006          * @param $minor Boolean: whereas it's a minor modification
4007          */
4008         public function quickEdit( $text, $comment = '', $minor = 0 ) {
4009                 wfProfileIn( __METHOD__ );
4010
4011                 $dbw = wfGetDB( DB_MASTER );
4012                 $revision = new Revision( array(
4013                         'page'       => $this->getId(),
4014                         'text'       => $text,
4015                         'comment'    => $comment,
4016                         'minor_edit' => $minor ? 1 : 0,
4017                         ) );
4018                 $revision->insertOn( $dbw );
4019                 $this->updateRevisionOn( $dbw, $revision );
4020
4021                 global $wgUser;
4022                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
4023
4024                 wfProfileOut( __METHOD__ );
4025         }
4026
4027         /**
4028          * The onArticle*() functions are supposed to be a kind of hooks
4029          * which should be called whenever any of the specified actions
4030          * are done.
4031          *
4032          * This is a good place to put code to clear caches, for instance.
4033          *
4034          * This is called on page move and undelete, as well as edit
4035          *
4036          * @param $title Title object
4037          */
4038         public static function onArticleCreate( $title ) {
4039                 # Update existence markers on article/talk tabs...
4040                 if ( $title->isTalkPage() ) {
4041                         $other = $title->getSubjectPage();
4042                 } else {
4043                         $other = $title->getTalkPage();
4044                 }
4045
4046                 $other->invalidateCache();
4047                 $other->purgeSquid();
4048
4049                 $title->touchLinks();
4050                 $title->purgeSquid();
4051                 $title->deleteTitleProtection();
4052         }
4053
4054         /**
4055          * Clears caches when article is deleted
4056          */
4057         public static function onArticleDelete( $title ) {
4058                 # Update existence markers on article/talk tabs...
4059                 if ( $title->isTalkPage() ) {
4060                         $other = $title->getSubjectPage();
4061                 } else {
4062                         $other = $title->getTalkPage();
4063                 }
4064
4065                 $other->invalidateCache();
4066                 $other->purgeSquid();
4067
4068                 $title->touchLinks();
4069                 $title->purgeSquid();
4070
4071                 # File cache
4072                 HTMLFileCache::clearFileCache( $title );
4073
4074                 # Messages
4075                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4076                         MessageCache::singleton()->replace( $title->getDBkey(), false );
4077                 }
4078
4079                 # Images
4080                 if ( $title->getNamespace() == NS_FILE ) {
4081                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4082                         $update->doUpdate();
4083                 }
4084
4085                 # User talk pages
4086                 if ( $title->getNamespace() == NS_USER_TALK ) {
4087                         $user = User::newFromName( $title->getText(), false );
4088                         $user->setNewtalk( false );
4089                 }
4090
4091                 # Image redirects
4092                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4093         }
4094
4095         /**
4096          * Purge caches on page update etc
4097          *
4098          * @param $title Title object
4099          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4100          */
4101         public static function onArticleEdit( $title ) {
4102                 global $wgDeferredUpdateList;
4103
4104                 // Invalidate caches of articles which include this page
4105                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4106
4107                 // Invalidate the caches of all pages which redirect here
4108                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4109
4110                 # Purge squid for this page only
4111                 $title->purgeSquid();
4112
4113                 # Clear file cache for this page only
4114                 HTMLFileCache::clearFileCache( $title );
4115         }
4116
4117         /**#@-*/
4118
4119         /**
4120          * Overriden by ImagePage class, only present here to avoid a fatal error
4121          * Called for ?action=revert
4122          */
4123         public function revert() {
4124                 global $wgOut;
4125                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4126         }
4127
4128         /**
4129          * Info about this page
4130          * Called for ?action=info when $wgAllowPageInfo is on.
4131          */
4132         public function info() {
4133                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4134
4135                 if ( !$wgAllowPageInfo ) {
4136                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4137                         return;
4138                 }
4139
4140                 $page = $this->mTitle->getSubjectPage();
4141
4142                 $wgOut->setPagetitle( $page->getPrefixedText() );
4143                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4144                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4145
4146                 if ( !$this->mTitle->exists() ) {
4147                         $wgOut->addHTML( '<div class="noarticletext">' );
4148                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4149                                 // This doesn't quite make sense; the user is asking for
4150                                 // information about the _page_, not the message... -- RC
4151                                 $wgOut->addHTML( htmlspecialchars( $this->mTitle->getDefaultMessageText() ) );
4152                         } else {
4153                                 $msg = $wgUser->isLoggedIn()
4154                                         ? 'noarticletext'
4155                                         : 'noarticletextanon';
4156                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4157                         }
4158
4159                         $wgOut->addHTML( '</div>' );
4160                 } else {
4161                         $dbr = wfGetDB( DB_SLAVE );
4162                         $wl_clause = array(
4163                                 'wl_title'     => $page->getDBkey(),
4164                                 'wl_namespace' => $page->getNamespace() );
4165                         $numwatchers = $dbr->selectField(
4166                                 'watchlist',
4167                                 'COUNT(*)',
4168                                 $wl_clause,
4169                                 __METHOD__,
4170                                 $this->getSelectOptions() );
4171
4172                         $pageInfo = $this->pageCountInfo( $page );
4173                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4174
4175
4176                         //FIXME: unescaped messages
4177                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4178                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4179
4180                         if ( $talkInfo ) {
4181                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4182                         }
4183
4184                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4185
4186                         if ( $talkInfo ) {
4187                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4188                         }
4189
4190                         $wgOut->addHTML( '</ul>' );
4191                 }
4192         }
4193
4194         /**
4195          * Return the total number of edits and number of unique editors
4196          * on a given page. If page does not exist, returns false.
4197          *
4198          * @param $title Title object
4199          * @return mixed array or boolean false
4200          */
4201         public function pageCountInfo( $title ) {
4202                 $id = $title->getArticleId();
4203
4204                 if ( $id == 0 ) {
4205                         return false;
4206                 }
4207
4208                 $dbr = wfGetDB( DB_SLAVE );
4209                 $rev_clause = array( 'rev_page' => $id );
4210                 $edits = $dbr->selectField(
4211                         'revision',
4212                         'COUNT(rev_page)',
4213                         $rev_clause,
4214                         __METHOD__,
4215                         $this->getSelectOptions()
4216                 );
4217                 $authors = $dbr->selectField(
4218                         'revision',
4219                         'COUNT(DISTINCT rev_user_text)',
4220                         $rev_clause,
4221                         __METHOD__,
4222                         $this->getSelectOptions()
4223                 );
4224
4225                 return array( 'edits' => $edits, 'authors' => $authors );
4226         }
4227
4228         /**
4229          * Return a list of templates used by this article.
4230          * Uses the templatelinks table
4231          *
4232          * @return Array of Title objects
4233          */
4234         public function getUsedTemplates() {
4235                 $result = array();
4236                 $id = $this->mTitle->getArticleID();
4237
4238                 if ( $id == 0 ) {
4239                         return array();
4240                 }
4241
4242                 $dbr = wfGetDB( DB_SLAVE );
4243                 $res = $dbr->select( array( 'templatelinks' ),
4244                         array( 'tl_namespace', 'tl_title' ),
4245                         array( 'tl_from' => $id ),
4246                         __METHOD__ );
4247
4248                 if ( $res !== false ) {
4249                         foreach ( $res as $row ) {
4250                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4251                         }
4252                 }
4253
4254                 return $result;
4255         }
4256
4257         /**
4258          * Returns a list of hidden categories this page is a member of.
4259          * Uses the page_props and categorylinks tables.
4260          *
4261          * @return Array of Title objects
4262          */
4263         public function getHiddenCategories() {
4264                 $result = array();
4265                 $id = $this->mTitle->getArticleID();
4266
4267                 if ( $id == 0 ) {
4268                         return array();
4269                 }
4270
4271                 $dbr = wfGetDB( DB_SLAVE );
4272                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4273                         array( 'cl_to' ),
4274                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4275                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4276                         __METHOD__ );
4277
4278                 if ( $res !== false ) {
4279                         foreach ( $res as $row ) {
4280                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4281                         }
4282                 }
4283
4284                 return $result;
4285         }
4286
4287         /**
4288         * Return an applicable autosummary if one exists for the given edit.
4289         * @param $oldtext String: the previous text of the page.
4290         * @param $newtext String: The submitted text of the page.
4291         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
4292         * @return string An appropriate autosummary, or an empty string.
4293         */
4294         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4295                 global $wgContLang;
4296
4297                 # Decide what kind of autosummary is needed.
4298
4299                 # Redirect autosummaries
4300                 $ot = Title::newFromRedirect( $oldtext );
4301                 $rt = Title::newFromRedirect( $newtext );
4302
4303                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4304                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4305                 }
4306
4307                 # New page autosummaries
4308                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4309                         # If they're making a new article, give its text, truncated, in the summary.
4310
4311                         $truncatedtext = $wgContLang->truncate(
4312                                 str_replace( "\n", ' ', $newtext ),
4313                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4314
4315                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4316                 }
4317
4318                 # Blanking autosummaries
4319                 if ( $oldtext != '' && $newtext == '' ) {
4320                         return wfMsgForContent( 'autosumm-blank' );
4321                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4322                         # Removing more than 90% of the article
4323
4324                         $truncatedtext = $wgContLang->truncate(
4325                                 $newtext,
4326                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4327
4328                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4329                 }
4330
4331                 # If we reach this point, there's no applicable autosummary for our case, so our
4332                 # autosummary is empty.
4333                 return '';
4334         }
4335
4336         /**
4337          * Add the primary page-view wikitext to the output buffer
4338          * Saves the text into the parser cache if possible.
4339          * Updates templatelinks if it is out of date.
4340          *
4341          * @param $text String
4342          * @param $cache Boolean
4343          * @param $parserOptions mixed ParserOptions object, or boolean false
4344          */
4345         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4346                 global $wgOut;
4347
4348                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4349                 $wgOut->addParserOutput( $this->mParserOutput );
4350         }
4351
4352         /**
4353          * This does all the heavy lifting for outputWikitext, except it returns the parser
4354          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4355          * say, embedding thread pages within a discussion system (LiquidThreads)
4356          *
4357          * @param $text string
4358          * @param $cache boolean
4359          * @param $parserOptions parsing options, defaults to false
4360          * @return string containing parsed output
4361          */
4362         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4363                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4364
4365                 if ( !$parserOptions ) {
4366                         $parserOptions = $this->getParserOptions();
4367                 }
4368
4369                 $time = - wfTime();
4370                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4371                         $parserOptions, true, true, $this->getRevIdFetched() );
4372                 $time += wfTime();
4373
4374                 # Timing hack
4375                 if ( $time > 3 ) {
4376                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4377                                 $this->mTitle->getPrefixedDBkey() ) );
4378                 }
4379
4380                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4381                         $parserCache = ParserCache::singleton();
4382                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4383                 }
4384
4385                 // Make sure file cache is not used on uncacheable content.
4386                 // Output that has magic words in it can still use the parser cache
4387                 // (if enabled), though it will generally expire sooner.
4388                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4389                         $wgUseFileCache = false;
4390                 }
4391
4392                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4393
4394                 return $this->mParserOutput;
4395         }
4396
4397         /**
4398          * Get parser options suitable for rendering the primary article wikitext
4399          * @param $canonical boolean Determines that the generated must not depend on user preferences (see bug 14404)
4400          * @return mixed ParserOptions object or boolean false
4401          */
4402         public function getParserOptions( $canonical = false ) {
4403                 global $wgUser, $wgLanguageCode;
4404
4405                 if ( !$this->mParserOptions || $canonical ) {
4406                         $user = !$canonical ? $wgUser : new User;
4407                         $parserOptions = new ParserOptions( $user );
4408                         $parserOptions->setTidy( true );
4409                         $parserOptions->enableLimitReport();
4410
4411                         if ( $canonical ) {
4412                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
4413                                 return $parserOptions;
4414                         }
4415                         $this->mParserOptions = $parserOptions;
4416                 }
4417
4418                 // Clone to allow modifications of the return value without affecting
4419                 // the cache
4420                 return clone $this->mParserOptions;
4421         }
4422
4423         /**
4424          * Updates cascading protections
4425          *
4426          * @param $parserOutput mixed ParserOptions object, or boolean false
4427          **/
4428         protected function doCascadeProtectionUpdates( $parserOutput ) {
4429                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4430                         return;
4431                 }
4432
4433                 // templatelinks table may have become out of sync,
4434                 // especially if using variable-based transclusions.
4435                 // For paranoia, check if things have changed and if
4436                 // so apply updates to the database. This will ensure
4437                 // that cascaded protections apply as soon as the changes
4438                 // are visible.
4439
4440                 # Get templates from templatelinks
4441                 $id = $this->mTitle->getArticleID();
4442
4443                 $tlTemplates = array();
4444
4445                 $dbr = wfGetDB( DB_SLAVE );
4446                 $res = $dbr->select( array( 'templatelinks' ),
4447                         array( 'tl_namespace', 'tl_title' ),
4448                         array( 'tl_from' => $id ),
4449                         __METHOD__
4450                 );
4451
4452                 foreach ( $res as $row ) {
4453                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4454                 }
4455
4456                 # Get templates from parser output.
4457                 $poTemplates = array();
4458                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4459                         foreach ( $templates as $dbk => $id ) {
4460                                 $poTemplates["$ns:$dbk"] = true;
4461                         }
4462                 }
4463
4464                 # Get the diff
4465                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4466
4467                 if ( count( $templates_diff ) > 0 ) {
4468                         # Whee, link updates time.
4469                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4470                         $u->doUpdate();
4471                 }
4472         }
4473
4474         /**
4475          * Update all the appropriate counts in the category table, given that
4476          * we've added the categories $added and deleted the categories $deleted.
4477          *
4478          * @param $added array   The names of categories that were added
4479          * @param $deleted array The names of categories that were deleted
4480          */
4481         public function updateCategoryCounts( $added, $deleted ) {
4482                 $ns = $this->mTitle->getNamespace();
4483                 $dbw = wfGetDB( DB_MASTER );
4484
4485                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4486                 # exist, we might legitimately not create it, but it's simpler to just
4487                 # create it and then give it a negative value, since the value is bogus
4488                 # anyway.
4489                 #
4490                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4491                 $insertCats = array_merge( $added, $deleted );
4492                 if ( !$insertCats ) {
4493                         # Okay, nothing to do
4494                         return;
4495                 }
4496
4497                 $insertRows = array();
4498
4499                 foreach ( $insertCats as $cat ) {
4500                         $insertRows[] = array(
4501                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4502                                 'cat_title' => $cat
4503                         );
4504                 }
4505                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4506
4507                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4508                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4509
4510                 if ( $ns == NS_CATEGORY ) {
4511                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4512                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4513                 } elseif ( $ns == NS_FILE ) {
4514                         $addFields[]    = 'cat_files = cat_files + 1';
4515                         $removeFields[] = 'cat_files = cat_files - 1';
4516                 }
4517
4518                 if ( $added ) {
4519                         $dbw->update(
4520                                 'category',
4521                                 $addFields,
4522                                 array( 'cat_title' => $added ),
4523                                 __METHOD__
4524                         );
4525                 }
4526
4527                 if ( $deleted ) {
4528                         $dbw->update(
4529                                 'category',
4530                                 $removeFields,
4531                                 array( 'cat_title' => $deleted ),
4532                                 __METHOD__
4533                         );
4534                 }
4535         }
4536
4537         /**
4538          * Lightweight method to get the parser output for a page, checking the parser cache
4539          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4540          * consider, so it's not appropriate to use there.
4541          *
4542          * @since 1.16 (r52326) for LiquidThreads
4543          *
4544          * @param $oldid mixed integer Revision ID or null
4545          * @return ParserOutput or false if the given revsion ID is not found
4546          */
4547         public function getParserOutput( $oldid = null ) {
4548                 global $wgEnableParserCache, $wgUser;
4549
4550                 // Should the parser cache be used?
4551                 $useParserCache = $wgEnableParserCache &&
4552                         $wgUser->getStubThreshold() == 0 &&
4553                         $this->exists() &&
4554                         $oldid === null;
4555
4556                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4557
4558                 if ( $wgUser->getStubThreshold() ) {
4559                         wfIncrStats( 'pcache_miss_stub' );
4560                 }
4561
4562                 if ( $useParserCache ) {
4563                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4564                         if ( $parserOutput !== false ) {
4565                                 return $parserOutput;
4566                         }
4567                 }
4568
4569                 // Cache miss; parse and output it.
4570                 if ( $oldid === null ) {
4571                         $text = $this->getRawText();
4572                 } else {
4573                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4574                         if ( $rev === null ) {
4575                                 return false;
4576                         }
4577                         $text = $rev->getText();
4578                 }
4579
4580                 return $this->getOutputFromWikitext( $text, $useParserCache );
4581         }
4582
4583 }
4584
4585 class PoolWorkArticleView extends PoolCounterWork {
4586         private $mArticle;
4587
4588         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4589                 parent::__construct( 'ArticleView', $key );
4590                 $this->mArticle = $article;
4591                 $this->cacheable = $useParserCache;
4592                 $this->parserOptions = $parserOptions;
4593         }
4594
4595         function doWork() {
4596                 return $this->mArticle->doViewParse();
4597         }
4598
4599         function getCachedWork() {
4600                 global $wgOut;
4601
4602                 $parserCache = ParserCache::singleton();
4603                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4604
4605                 if ( $this->mArticle->mParserOutput !== false ) {
4606                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4607                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4608                         # Ensure that UI elements requiring revision ID have
4609                         # the correct version information.
4610                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4611                         return true;
4612                 }
4613                 return false;
4614         }
4615
4616         function fallback() {
4617                 return $this->mArticle->tryDirtyCache();
4618         }
4619
4620         function error( $status ) {
4621                 global $wgOut;
4622
4623                 $wgOut->clearHTML(); // for release() errors
4624                 $wgOut->enableClientCache( false );
4625                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4626
4627                 $errortext = $status->getWikiText( false, 'view-pool-error' );
4628                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4629
4630                 return false;
4631         }
4632 }