includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  * @internal documentation reviewed 15 Mar 2010
  15  */
  16 class Article {
  17         /**@{{
  18          * @private
  19          */
  20         var $mComment = '';               // !<
  21         var $mContent;                    // !<
  22         var $mContentLoaded = false;      // !<
  23         var $mCounter = -1;               // !< Not loaded
  24         var $mCurID = -1;                 // !< Not loaded
  25         var $mDataLoaded = false;         // !<
  26         var $mForUpdate = false;          // !<
  27         var $mGoodAdjustment = 0;         // !<
  28         var $mIsRedirect = false;         // !<
  29         var $mLatest = false;             // !<
  30         var $mMinorEdit;                  // !<
  31         var $mOldId;                      // !<
  32         var $mPreparedEdit = false;       // !< Title object if set
  33         var $mRedirectedFrom = null;      // !< Title object if set
  34         var $mRedirectTarget = null;      // !< Title object if set
  35         var $mRedirectUrl = false;        // !<
  36         var $mRevIdFetched = 0;           // !<
  37         var $mRevision;                   // !< Revision object if set
  38         var $mTimestamp = '';             // !<
  39         var $mTitle;                      // !< Title object
  40         var $mTotalAdjustment = 0;        // !<
  41         var $mTouched = '19700101000000'; // !<
  42         var $mUser = -1;                  // !< Not loaded
  43         var $mUserText = '';              // !< username from Revision if set
  44         var $mParserOptions;              // !< ParserOptions object
  45         var $mParserOutput;               // !< ParserCache object if set
  46         /**@}}*/
  47
  48         /**
  49          * Constructor and clear the article
  50          * @param $title Reference to a Title object.
  51          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  52          */
  53         public function __construct( Title $title, $oldId = null ) {
  54                 // FIXME: does the reference play any role here?
  55                 $this->mTitle =& $title;
  56                 $this->mOldId = $oldId;
  57         }
  58
  59         /**
  60          * Constructor from an page id
  61          * @param $id The article ID to load
  62          */
  63         public static function newFromID( $id ) {
  64                 $t = Title::newFromID( $id );
  65                 # FIXME: doesn't inherit right
  66                 return $t == null ? null : new self( $t );
  67                 # return $t == null ? null : new static( $t ); // PHP 5.3
  68         }
  69
  70         /**
  71          * Tell the page view functions that this view was redirected
  72          * from another page on the wiki.
  73          * @param $from Title object.
  74          */
  75         public function setRedirectedFrom( Title $from ) {
  76                 $this->mRedirectedFrom = $from;
  77         }
  78
  79         /**
  80          * If this page is a redirect, get its target
  81          *
  82          * The target will be fetched from the redirect table if possible.
  83          * If this page doesn't have an entry there, call insertRedirect()
  84          * @return mixed Title object, or null if this page is not a redirect
  85          */
  86         public function getRedirectTarget() {
  87                 if ( !$this->mTitle->isRedirect() ) {
  88                         return null;
  89                 }
  90
  91                 if ( $this->mRedirectTarget !== null ) {
  92                         return $this->mRedirectTarget;
  93                 }
  94
  95                 # Query the redirect table
  96                 $dbr = wfGetDB( DB_SLAVE );
  97                 $row = $dbr->selectRow( 'redirect',
  98                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  99                         array( 'rd_from' => $this->getID() ),
 100                         __METHOD__
 101                 );
 102
 103                 // rd_fragment and rd_interwiki were added later, populate them if empty
 104                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 105                         return $this->mRedirectTarget = Title::makeTitle(
 106                                 $row->rd_namespace, $row->rd_title,
 107                                 $row->rd_fragment, $row->rd_interwiki );
 108                 }
 109
 110                 # This page doesn't have an entry in the redirect table
 111                 return $this->mRedirectTarget = $this->insertRedirect();
 112         }
 113
 114         /**
 115          * Insert an entry for this page into the redirect table.
 116          *
 117          * Don't call this function directly unless you know what you're doing.
 118          * @return Title object or null if not a redirect
 119          */
 120         public function insertRedirect() {
 121                 // recurse through to only get the final target
 122                 $retval = Title::newFromRedirectRecurse( $this->getContent() );
 123                 if ( !$retval ) {
 124                         return null;
 125                 }
 126                 $this->insertRedirectEntry( $retval );
 127                 return $retval;
 128         }
 129
 130         /**
 131          * Insert or update the redirect table entry for this page to indicate
 132          * it redirects to $rt .
 133          * @param $rt Title redirect target
 134          */
 135         public function insertRedirectEntry( $rt ) {
 136                 $dbw = wfGetDB( DB_MASTER );
 137                 $dbw->replace( 'redirect', array( 'rd_from' ),
 138                         array(
 139                                 'rd_from' => $this->getID(),
 140                                 'rd_namespace' => $rt->getNamespace(),
 141                                 'rd_title' => $rt->getDBkey(),
 142                                 'rd_fragment' => $rt->getFragment(),
 143                                 'rd_interwiki' => $rt->getInterwiki(),
 144                         ),
 145                         __METHOD__
 146                 );
 147         }
 148
 149         /**
 150          * Get the Title object or URL this page redirects to
 151          *
 152          * @return mixed false, Title of in-wiki target, or string with URL
 153          */
 154         public function followRedirect() {
 155                 return $this->getRedirectURL( $this->getRedirectTarget() );
 156         }
 157
 158         /**
 159          * Get the Title object this text redirects to
 160          *
 161          * @param $text string article content containing redirect info
 162          * @return mixed false, Title of in-wiki target, or string with URL
 163          * @deprecated
 164          */
 165         public function followRedirectText( $text ) {
 166                 // recurse through to only get the final target
 167                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 168         }
 169
 170         /**
 171          * Get the Title object or URL to use for a redirect. We use Title
 172          * objects for same-wiki, non-special redirects and URLs for everything
 173          * else.
 174          * @param $rt Title Redirect target
 175          * @return mixed false, Title object of local target, or string with URL
 176          */
 177         public function getRedirectURL( $rt ) {
 178                 if ( $rt ) {
 179                         if ( $rt->getInterwiki() != '' ) {
 180                                 if ( $rt->isLocal() ) {
 181                                         // Offsite wikis need an HTTP redirect.
 182                                         //
 183                                         // This can be hard to reverse and may produce loops,
 184                                         // so they may be disabled in the site configuration.
 185                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 186                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 187                                 }
 188                         } else {
 189                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 190                                         // Gotta handle redirects to special pages differently:
 191                                         // Fill the HTTP response "Location" header and ignore
 192                                         // the rest of the page we're on.
 193                                         //
 194                                         // This can be hard to reverse, so they may be disabled.
 195                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 196                                                 // rolleyes
 197                                         } else {
 198                                                 return $rt->getFullURL();
 199                                         }
 200                                 }
 201
 202                                 return $rt;
 203                         }
 204                 }
 205
 206                 // No or invalid redirect
 207                 return false;
 208         }
 209
 210         /**
 211          * Get the title object of the article
 212          * @return Title object of this page
 213          */
 214         public function getTitle() {
 215                 return $this->mTitle;
 216         }
 217
 218         /**
 219          * Clear the object
 220          * FIXME: shouldn't this be public?
 221          * @private
 222          */
 223         public function clear() {
 224                 $this->mDataLoaded    = false;
 225                 $this->mContentLoaded = false;
 226
 227                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 228                 $this->mRedirectedFrom = null; # Title object if set
 229                 $this->mRedirectTarget = null; # Title object if set
 230                 $this->mUserText =
 231                 $this->mTimestamp = $this->mComment = '';
 232                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 233                 $this->mTouched = '19700101000000';
 234                 $this->mForUpdate = false;
 235                 $this->mIsRedirect = false;
 236                 $this->mRevIdFetched = 0;
 237                 $this->mRedirectUrl = false;
 238                 $this->mLatest = false;
 239                 $this->mPreparedEdit = false;
 240         }
 241
 242         /**
 243          * Note that getContent/loadContent do not follow redirects anymore.
 244          * If you need to fetch redirectable content easily, try
 245          * the shortcut in Article::followRedirect()
 246          *
 247          * This function has side effects! Do not use this function if you
 248          * only want the real revision text if any.
 249          *
 250          * @return Return the text of this revision
 251          */
 252         public function getContent() {
 253                 global $wgUser, $wgContLang, $wgMessageCache;
 254
 255                 wfProfileIn( __METHOD__ );
 256
 257                 if ( $this->getID() === 0 ) {
 258                         # If this is a MediaWiki:x message, then load the messages
 259                         # and return the message value for x.
 260                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 261                                 # If this is a system message, get the default text.
 262                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 263                                 $text = wfMsgGetKey( $message, false, $lang, false );
 264
 265                                 if ( wfEmptyMsg( $message, $text ) )
 266                                         $text = '';
 267                         } else {
 268                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 269                         }
 270                         wfProfileOut( __METHOD__ );
 271
 272                         return $text;
 273                 } else {
 274                         $this->loadContent();
 275                         wfProfileOut( __METHOD__ );
 276
 277                         return $this->mContent;
 278                 }
 279         }
 280
 281         /**
 282          * Get the text of the current revision. No side-effects...
 283          *
 284          * @return Return the text of the current revision
 285          */
 286         public function getRawText() {
 287                 // Check process cache for current revision
 288                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 289                         return $this->mContent;
 290                 }
 291
 292                 $rev = Revision::newFromTitle( $this->mTitle );
 293                 $text = $rev ? $rev->getRawText() : false;
 294
 295                 return $text;
 296         }
 297
 298         /**
 299          * This function returns the text of a section, specified by a number ($section).
 300          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 301          * the first section before any such heading (section 0).
 302          *
 303          * If a section contains subsections, these are also returned.
 304          *
 305          * @param $text String: text to look in
 306          * @param $section Integer: section number
 307          * @return string text of the requested section
 308          * @deprecated
 309          */
 310         public function getSection( $text, $section ) {
 311                 global $wgParser;
 312                 return $wgParser->getSection( $text, $section );
 313         }
 314
 315         /**
 316          * Get the text that needs to be saved in order to undo all revisions
 317          * between $undo and $undoafter. Revisions must belong to the same page,
 318          * must exist and must not be deleted
 319          * @param $undo Revision
 320          * @param $undoafter Revision Must be an earlier revision than $undo
 321          * @return mixed string on success, false on failure
 322          */
 323         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 324                 $undo_text = $undo->getText();
 325                 $undoafter_text = $undoafter->getText();
 326                 $cur_text = $this->getContent();
 327
 328                 if ( $cur_text == $undo_text ) {
 329                         # No use doing a merge if it's just a straight revert.
 330                         return $undoafter_text;
 331                 }
 332
 333                 $undone_text = '';
 334
 335                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 336                         return false;
 337                 }
 338
 339                 return $undone_text;
 340         }
 341
 342         /**
 343          * @return int The oldid of the article that is to be shown, 0 for the
 344          *             current revision
 345          */
 346         public function getOldID() {
 347                 if ( is_null( $this->mOldId ) ) {
 348                         $this->mOldId = $this->getOldIDFromRequest();
 349                 }
 350
 351                 return $this->mOldId;
 352         }
 353
 354         /**
 355          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 356          *
 357          * @return int The old id for the request
 358          */
 359         public function getOldIDFromRequest() {
 360                 global $wgRequest;
 361
 362                 $this->mRedirectUrl = false;
 363
 364                 $oldid = $wgRequest->getVal( 'oldid' );
 365
 366                 if ( isset( $oldid ) ) {
 367                         $oldid = intval( $oldid );
 368                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 369                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 370                                 if ( $nextid ) {
 371                                         $oldid = $nextid;
 372                                 } else {
 373                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 374                                 }
 375                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 376                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 377                                 if ( $previd ) {
 378                                         $oldid = $previd;
 379                                 }
 380                         }
 381                 }
 382
 383                 if ( !$oldid ) {
 384                         $oldid = 0;
 385                 }
 386
 387                 return $oldid;
 388         }
 389
 390         /**
 391          * Load the revision (including text) into this object
 392          */
 393         function loadContent() {
 394                 if ( $this->mContentLoaded ) {
 395                         return;
 396                 }
 397
 398                 wfProfileIn( __METHOD__ );
 399
 400                 $oldid = $this->getOldID();
 401                 $this->mOldId = $oldid;
 402                 $this->fetchContent( $oldid );
 403
 404                 wfProfileOut( __METHOD__ );
 405         }
 406
 407         /**
 408          * Fetch a page record with the given conditions
 409          * @param $dbr Database object
 410          * @param $conditions Array
 411          * @return mixed Database result resource, or false on failure
 412          */
 413         protected function pageData( $dbr, $conditions ) {
 414                 $fields = array(
 415                                 'page_id',
 416                                 'page_namespace',
 417                                 'page_title',
 418                                 'page_restrictions',
 419                                 'page_counter',
 420                                 'page_is_redirect',
 421                                 'page_is_new',
 422                                 'page_random',
 423                                 'page_touched',
 424                                 'page_latest',
 425                                 'page_len',
 426                 );
 427
 428                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 429
 430                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 431
 432                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 433
 434                 return $row;
 435         }
 436
 437         /**
 438          * Fetch a page record matching the Title object's namespace and title
 439          * using a sanitized title string
 440          *
 441          * @param $dbr Database object
 442          * @param $title Title object
 443          * @return mixed Database result resource, or false on failure
 444          */
 445         public function pageDataFromTitle( $dbr, $title ) {
 446                 return $this->pageData( $dbr, array(
 447                         'page_namespace' => $title->getNamespace(),
 448                         'page_title'     => $title->getDBkey() ) );
 449         }
 450
 451         /**
 452          * Fetch a page record matching the requested ID
 453          *
 454          * @param $dbr Database
 455          * @param $id Integer
 456          */
 457         protected function pageDataFromId( $dbr, $id ) {
 458                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 459         }
 460
 461         /**
 462          * Set the general counter, title etc data loaded from
 463          * some source.
 464          *
 465          * @param $data Database row object or "fromdb"
 466          */
 467         public function loadPageData( $data = 'fromdb' ) {
 468                 if ( $data === 'fromdb' ) {
 469                         $dbr = wfGetDB( DB_MASTER );
 470                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 471                 }
 472
 473                 $lc = LinkCache::singleton();
 474
 475                 if ( $data ) {
 476                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 477
 478                         $this->mTitle->mArticleID = intval( $data->page_id );
 479
 480                         # Old-fashioned restrictions
 481                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 482
 483                         $this->mCounter     = intval( $data->page_counter );
 484                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 485                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 486                         $this->mLatest      = intval( $data->page_latest );
 487                 } else {
 488                         $lc->addBadLinkObj( $this->mTitle );
 489                         $this->mTitle->mArticleID = 0;
 490                 }
 491
 492                 $this->mDataLoaded = true;
 493         }
 494
 495         /**
 496          * Get text of an article from database
 497          * Does *NOT* follow redirects.
 498          *
 499          * @param $oldid Int: 0 for whatever the latest revision is
 500          * @return mixed string containing article contents, or false if null
 501          */
 502         function fetchContent( $oldid = 0 ) {
 503                 if ( $this->mContentLoaded ) {
 504                         return $this->mContent;
 505                 }
 506
 507                 $dbr = wfGetDB( DB_MASTER );
 508
 509                 # Pre-fill content with error message so that if something
 510                 # fails we'll have something telling us what we intended.
 511                 $t = $this->mTitle->getPrefixedText();
 512                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 513                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 514
 515                 if ( $oldid ) {
 516                         $revision = Revision::newFromId( $oldid );
 517                         if ( $revision === null ) {
 518                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 519                                 return false;
 520                         }
 521
 522                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 523
 524                         if ( !$data ) {
 525                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 526                                 return false;
 527                         }
 528
 529                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 530                         $this->loadPageData( $data );
 531                 } else {
 532                         if ( !$this->mDataLoaded ) {
 533                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 534
 535                                 if ( !$data ) {
 536                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 537                                         return false;
 538                                 }
 539
 540                                 $this->loadPageData( $data );
 541                         }
 542                         $revision = Revision::newFromId( $this->mLatest );
 543                         if (  $revision === null ) {
 544                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 545                                 return false;
 546                         }
 547                 }
 548
 549                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 550                 // We should instead work with the Revision object when we need it...
 551                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 552
 553                 $this->mUser      = $revision->getUser();
 554                 $this->mUserText  = $revision->getUserText();
 555                 $this->mComment   = $revision->getComment();
 556                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 557
 558                 $this->mRevIdFetched = $revision->getId();
 559                 $this->mContentLoaded = true;
 560                 $this->mRevision =& $revision;
 561
 562                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 563
 564                 return $this->mContent;
 565         }
 566
 567         /**
 568          * Read/write accessor to select FOR UPDATE
 569          *
 570          * @param $x Mixed: FIXME
 571          * @return mixed value of $x, or value stored in Article::mForUpdate
 572          */
 573         public function forUpdate( $x = null ) {
 574                 return wfSetVar( $this->mForUpdate, $x );
 575         }
 576
 577         /**
 578          * Get options for all SELECT statements
 579          *
 580          * @param $options Array: an optional options array which'll be appended to
 581          *                       the default
 582          * @return Array: options
 583          */
 584         protected function getSelectOptions( $options = '' ) {
 585                 if ( $this->mForUpdate ) {
 586                         if ( is_array( $options ) ) {
 587                                 $options[] = 'FOR UPDATE';
 588                         } else {
 589                                 $options = 'FOR UPDATE';
 590                         }
 591                 }
 592
 593                 return $options;
 594         }
 595
 596         /**
 597          * @return int Page ID
 598          */
 599         public function getID() {
 600                 return $this->mTitle->getArticleID();
 601         }
 602
 603         /**
 604          * @return bool Whether or not the page exists in the database
 605          */
 606         public function exists() {
 607                 return $this->getId() > 0;
 608         }
 609
 610         /**
 611          * Check if this page is something we're going to be showing
 612          * some sort of sensible content for. If we return false, page
 613          * views (plain action=view) will return an HTTP 404 response,
 614          * so spiders and robots can know they're following a bad link.
 615          *
 616          * @return bool
 617          */
 618         public function hasViewableContent() {
 619                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 620         }
 621
 622         /**
 623          * @return int The view count for the page
 624          */
 625         public function getCount() {
 626                 if ( -1 == $this->mCounter ) {
 627                         $id = $this->getID();
 628
 629                         if ( $id == 0 ) {
 630                                 $this->mCounter = 0;
 631                         } else {
 632                                 $dbr = wfGetDB( DB_SLAVE );
 633                                 $this->mCounter = $dbr->selectField( 'page',
 634                                         'page_counter',
 635                                         array( 'page_id' => $id ),
 636                                         __METHOD__,
 637                                         $this->getSelectOptions()
 638                                 );
 639                         }
 640                 }
 641
 642                 return $this->mCounter;
 643         }
 644
 645         /**
 646          * Determine whether a page would be suitable for being counted as an
 647          * article in the site_stats table based on the title & its content
 648          *
 649          * @param $text String: text to analyze
 650          * @return bool
 651          */
 652         public function isCountable( $text ) {
 653                 global $wgUseCommaCount;
 654
 655                 $token = $wgUseCommaCount ? ',' : '[[';
 656
 657                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 658         }
 659
 660         /**
 661          * Tests if the article text represents a redirect
 662          *
 663          * @param $text mixed string containing article contents, or boolean
 664          * @return bool
 665          */
 666         public function isRedirect( $text = false ) {
 667                 if ( $text === false ) {
 668                         if ( $this->mDataLoaded ) {
 669                                 return $this->mIsRedirect;
 670                         }
 671
 672                         // Apparently loadPageData was never called
 673                         $this->loadContent();
 674                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 675                 } else {
 676                         $titleObj = Title::newFromRedirect( $text );
 677                 }
 678
 679                 return $titleObj !== null;
 680         }
 681
 682         /**
 683          * Returns true if the currently-referenced revision is the current edit
 684          * to this page (and it exists).
 685          * @return bool
 686          */
 687         public function isCurrent() {
 688                 # If no oldid, this is the current version.
 689                 if ( $this->getOldID() == 0 ) {
 690                         return true;
 691                 }
 692
 693                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 694         }
 695
 696         /**
 697          * Loads everything except the text
 698          * This isn't necessary for all uses, so it's only done if needed.
 699          */
 700         protected function loadLastEdit() {
 701                 if ( -1 != $this->mUser ) {
 702                         return;
 703                 }
 704
 705                 # New or non-existent articles have no user information
 706                 $id = $this->getID();
 707                 if ( 0 == $id ) {
 708                         return;
 709                 }
 710
 711                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 712                 if ( !is_null( $this->mLastRevision ) ) {
 713                         $this->mUser      = $this->mLastRevision->getUser();
 714                         $this->mUserText  = $this->mLastRevision->getUserText();
 715                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 716                         $this->mComment   = $this->mLastRevision->getComment();
 717                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 718                         $this->mRevIdFetched = $this->mLastRevision->getId();
 719                 }
 720         }
 721
 722         /**
 723          * @return string GMT timestamp of last article revision
 724          **/
 725
 726         public function getTimestamp() {
 727                 // Check if the field has been filled by ParserCache::get()
 728                 if ( !$this->mTimestamp ) {
 729                         $this->loadLastEdit();
 730                 }
 731
 732                 return wfTimestamp( TS_MW, $this->mTimestamp );
 733         }
 734
 735         /**
 736          * @return int user ID for the user that made the last article revision
 737          */
 738         public function getUser() {
 739                 $this->loadLastEdit();
 740                 return $this->mUser;
 741         }
 742
 743         /**
 744          * @return string username of the user that made the last article revision
 745          */
 746         public function getUserText() {
 747                 $this->loadLastEdit();
 748                 return $this->mUserText;
 749         }
 750
 751         /**
 752          * @return string Comment stored for the last article revision
 753          */
 754         public function getComment() {
 755                 $this->loadLastEdit();
 756                 return $this->mComment;
 757         }
 758
 759         /**
 760          * Returns true if last revision was marked as "minor edit"
 761          *
 762          * @return boolean Minor edit indicator for the last article revision.
 763          */
 764         public function getMinorEdit() {
 765                 $this->loadLastEdit();
 766                 return $this->mMinorEdit;
 767         }
 768
 769         /**
 770          * Use this to fetch the rev ID used on page views
 771          *
 772          * @return int revision ID of last article revision
 773          */
 774         public function getRevIdFetched() {
 775                 $this->loadLastEdit();
 776                 return $this->mRevIdFetched;
 777         }
 778
 779         /**
 780          * FIXME: this does what?
 781          * @param $limit Integer: default 0.
 782          * @param $offset Integer: default 0.
 783          * @return UserArrayFromResult object with User objects of article contributors for requested range
 784          */
 785         public function getContributors( $limit = 0, $offset = 0 ) {
 786                 # FIXME: this is expensive; cache this info somewhere.
 787
 788                 $dbr = wfGetDB( DB_SLAVE );
 789                 $revTable = $dbr->tableName( 'revision' );
 790                 $userTable = $dbr->tableName( 'user' );
 791
 792                 $pageId = $this->getId();
 793
 794                 $user = $this->getUser();
 795
 796                 if ( $user ) {
 797                         $excludeCond = "AND rev_user != $user";
 798                 } else {
 799                         $userText = $dbr->addQuotes( $this->getUserText() );
 800                         $excludeCond = "AND rev_user_text != $userText";
 801                 }
 802
 803                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 804
 805                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 806                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 807                         WHERE rev_page = $pageId
 808                         $excludeCond
 809                         AND $deletedBit = 0
 810                         GROUP BY rev_user, rev_user_text
 811                         ORDER BY timestamp DESC";
 812
 813                 if ( $limit > 0 ) {
 814                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 815                 }
 816
 817                 $sql .= ' ' . $this->getSelectOptions();
 818                 $res = $dbr->query( $sql, __METHOD__ );
 819
 820                 return new UserArrayFromResult( $res );
 821         }
 822
 823         /**
 824          * This is the default action of the index.php entry point: just view the
 825          * page of the given title.
 826          */
 827         public function view() {
 828                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 829                 global $wgUseFileCache, $wgUseETag;
 830
 831                 wfProfileIn( __METHOD__ );
 832
 833                 # Get variables from query string
 834                 $oldid = $this->getOldID();
 835                 $parserCache = ParserCache::singleton();
 836
 837                 $parserOptions = $this->getParserOptions();
 838                 # Render printable version, use printable version cache
 839                 if ( $wgOut->isPrintable() ) {
 840                         $parserOptions->setIsPrintable( true );
 841                         $parserOptions->setEditSection( false );
 842                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 843                         $parserOptions->setEditSection( false );
 844                 }
 845
 846                 # Try client and file cache
 847                 if ( $oldid === 0 && $this->checkTouched() ) {
 848                         if ( $wgUseETag ) {
 849                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 850                         }
 851
 852                         # Is is client cached?
 853                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 854                                 wfDebug( __METHOD__ . ": done 304\n" );
 855                                 wfProfileOut( __METHOD__ );
 856
 857                                 return;
 858                         # Try file cache
 859                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 860                                 wfDebug( __METHOD__ . ": done file cache\n" );
 861                                 # tell wgOut that output is taken care of
 862                                 $wgOut->disable();
 863                                 $this->viewUpdates();
 864                                 wfProfileOut( __METHOD__ );
 865
 866                                 return;
 867                         }
 868                 }
 869
 870                 # getOldID may want us to redirect somewhere else
 871                 if ( $this->mRedirectUrl ) {
 872                         $wgOut->redirect( $this->mRedirectUrl );
 873                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 874                         wfProfileOut( __METHOD__ );
 875
 876                         return;
 877                 }
 878
 879                 $wgOut->setArticleFlag( true );
 880                 # Set page title (may be overridden by DISPLAYTITLE)
 881                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 882
 883                 # If we got diff in the query, we want to see a diff page instead of the article.
 884                 if ( $wgRequest->getCheck( 'diff' ) ) {
 885                         wfDebug( __METHOD__ . ": showing diff page\n" );
 886                         $this->showDiffPage();
 887                         wfProfileOut( __METHOD__ );
 888
 889                         return;
 890                 }
 891
 892                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 893                         $parserOptions->setEditSection( false );
 894                 }
 895
 896                 # Should the parser cache be used?
 897                 $useParserCache = $this->useParserCache( $oldid );
 898                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 899                 if ( $wgUser->getStubThreshold() ) {
 900                         wfIncrStats( 'pcache_miss_stub' );
 901                 }
 902
 903                 $wasRedirected = $this->showRedirectedFromHeader();
 904                 $this->showNamespaceHeader();
 905
 906                 # Iterate through the possible ways of constructing the output text.
 907                 # Keep going until $outputDone is set, or we run out of things to do.
 908                 $pass = 0;
 909                 $outputDone = false;
 910                 $this->mParserOutput = false;
 911
 912                 while ( !$outputDone && ++$pass ) {
 913                         switch( $pass ) {
 914                                 case 1:
 915                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 916                                         break;
 917                                 case 2:
 918                                         # Try the parser cache
 919                                         if ( $useParserCache ) {
 920                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 921
 922                                                 if ( $this->mParserOutput !== false ) {
 923                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 924                                                         $wgOut->addParserOutput( $this->mParserOutput );
 925                                                         # Ensure that UI elements requiring revision ID have
 926                                                         # the correct version information.
 927                                                         $wgOut->setRevisionId( $this->mLatest );
 928                                                         $outputDone = true;
 929                                                 }
 930                                         }
 931                                         break;
 932                                 case 3:
 933                                         $text = $this->getContent();
 934                                         if ( $text === false || $this->getID() == 0 ) {
 935                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 936                                                 $this->showMissingArticle();
 937                                                 wfProfileOut( __METHOD__ );
 938                                                 return;
 939                                         }
 940
 941                                         # Another whitelist check in case oldid is altering the title
 942                                         if ( !$this->mTitle->userCanRead() ) {
 943                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 944                                                 $wgOut->loginToUse();
 945                                                 $wgOut->output();
 946                                                 $wgOut->disable();
 947                                                 wfProfileOut( __METHOD__ );
 948                                                 return;
 949                                         }
 950
 951                                         # Are we looking at an old revision
 952                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 953                                                 $this->setOldSubtitle( $oldid );
 954
 955                                                 if ( !$this->showDeletedRevisionHeader() ) {
 956                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 957                                                         wfProfileOut( __METHOD__ );
 958                                                         return;
 959                                                 }
 960
 961                                                 # If this "old" version is the current, then try the parser cache...
 962                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 963                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 964                                                         if ( $this->mParserOutput ) {
 965                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 966                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 967                                                                 $wgOut->setRevisionId( $this->mLatest );
 968                                                                 $outputDone = true;
 969                                                                 break;
 970                                                         }
 971                                                 }
 972                                         }
 973
 974                                         # Ensure that UI elements requiring revision ID have
 975                                         # the correct version information.
 976                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 977
 978                                         # Pages containing custom CSS or JavaScript get special treatment
 979                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 980                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 981                                                 $this->showCssOrJsPage();
 982                                                 $outputDone = true;
 983                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 984                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 985                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 986                                                 # Don't append the subtitle if this was an old revision
 987                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 988                                                 # Parse just to get categories, displaytitle, etc.
 989                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 990                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 991                                                 $outputDone = true;
 992                                         }
 993                                         break;
 994                                 case 4:
 995                                         # Run the parse, protected by a pool counter
 996                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 997
 998                                         $this->checkTouched();
 999                                         $key = $parserCache->getKey( $this, $parserOptions );
1000                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
1001                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
1002                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
1003
1004                                         if ( !$status->isOK() ) {
1005                                                 # Connection or timeout error
1006                                                 $this->showPoolError( $status );
1007                                                 wfProfileOut( __METHOD__ );
1008                                                 return;
1009                                         } else {
1010                                                 $outputDone = true;
1011                                         }
1012                                         break;
1013                                 # Should be unreachable, but just in case...
1014                                 default:
1015                                         break 2;
1016                         }
1017                 }
1018
1019                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1020                 if ( $this->mParserOutput ) {
1021                         $titleText = $this->mParserOutput->getTitleText();
1022
1023                         if ( strval( $titleText ) !== '' ) {
1024                                 $wgOut->setPageTitle( $titleText );
1025                         }
1026                 }
1027
1028                 # For the main page, overwrite the <title> element with the con-
1029                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1030                 # that's not empty).
1031                 # This message always exists because it is in the i18n files
1032                 if ( $this->mTitle->equals( Title::newMainPage() )
1033                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
1034                 {
1035                         $wgOut->setHTMLTitle( $m );
1036                 }
1037
1038                 # Now that we've filled $this->mParserOutput, we know whether
1039                 # there are any __NOINDEX__ tags on the page
1040                 $policy = $this->getRobotPolicy( 'view' );
1041                 $wgOut->setIndexPolicy( $policy['index'] );
1042                 $wgOut->setFollowPolicy( $policy['follow'] );
1043
1044                 $this->showViewFooter();
1045                 $this->viewUpdates();
1046                 wfProfileOut( __METHOD__ );
1047         }
1048
1049         /**
1050          * Show a diff page according to current request variables. For use within
1051          * Article::view() only, other callers should use the DifferenceEngine class.
1052          */
1053         public function showDiffPage() {
1054                 global $wgRequest, $wgUser;
1055
1056                 $diff = $wgRequest->getVal( 'diff' );
1057                 $rcid = $wgRequest->getVal( 'rcid' );
1058                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1059                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1060                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1061                 $oldid = $this->getOldID();
1062
1063                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1064                 // DifferenceEngine directly fetched the revision:
1065                 $this->mRevIdFetched = $de->mNewid;
1066                 $de->showDiffPage( $diffOnly );
1067
1068                 // Needed to get the page's current revision
1069                 $this->loadPageData();
1070                 if ( $diff == 0 || $diff == $this->mLatest ) {
1071                         # Run view updates for current revision only
1072                         $this->viewUpdates();
1073                 }
1074         }
1075
1076         /**
1077          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1078          * Article::view() only.
1079          *
1080          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1081          * page views.
1082          */
1083         protected function showCssOrJsPage() {
1084                 global $wgOut;
1085
1086                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1087
1088                 // Give hooks a chance to customise the output
1089                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1090                         // Wrap the whole lot in a <pre> and don't parse
1091                         $m = array();
1092                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1093                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1094                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1095                         $wgOut->addHTML( "\n</pre>\n" );
1096                 }
1097         }
1098
1099         /**
1100          * Get the robot policy to be used for the current view
1101          * @param $action String the action= GET parameter
1102          * @return Array the policy that should be set
1103          * TODO: actions other than 'view'
1104          */
1105         public function getRobotPolicy( $action ) {
1106                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1107                 global $wgDefaultRobotPolicy, $wgRequest;
1108
1109                 $ns = $this->mTitle->getNamespace();
1110
1111                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1112                         # Don't index user and user talk pages for blocked users (bug 11443)
1113                         if ( !$this->mTitle->isSubpage() ) {
1114                                 $block = new Block();
1115                                 if ( $block->load( $this->mTitle->getText() ) ) {
1116                                         return array(
1117                                                 'index'  => 'noindex',
1118                                                 'follow' => 'nofollow'
1119                                         );
1120                                 }
1121                         }
1122                 }
1123
1124                 if ( $this->getID() === 0 || $this->getOldID() ) {
1125                         # Non-articles (special pages etc), and old revisions
1126                         return array(
1127                                 'index'  => 'noindex',
1128                                 'follow' => 'nofollow'
1129                         );
1130                 } elseif ( $wgOut->isPrintable() ) {
1131                         # Discourage indexing of printable versions, but encourage following
1132                         return array(
1133                                 'index'  => 'noindex',
1134                                 'follow' => 'follow'
1135                         );
1136                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1137                         # For ?curid=x urls, disallow indexing
1138                         return array(
1139                                 'index'  => 'noindex',
1140                                 'follow' => 'follow'
1141                         );
1142                 }
1143
1144                 # Otherwise, construct the policy based on the various config variables.
1145                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1146
1147                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1148                         # Honour customised robot policies for this namespace
1149                         $policy = array_merge(
1150                                 $policy,
1151                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1152                         );
1153                 }
1154                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1155                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1156                         # a final sanity check that we have really got the parser output.
1157                         $policy = array_merge(
1158                                 $policy,
1159                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1160                         );
1161                 }
1162
1163                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1164                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1165                         $policy = array_merge(
1166                                 $policy,
1167                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1168                         );
1169                 }
1170
1171                 return $policy;
1172         }
1173
1174         /**
1175          * Converts a String robot policy into an associative array, to allow
1176          * merging of several policies using array_merge().
1177          * @param $policy Mixed, returns empty array on null/false/'', transparent
1178          *            to already-converted arrays, converts String.
1179          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1180          */
1181         public static function formatRobotPolicy( $policy ) {
1182                 if ( is_array( $policy ) ) {
1183                         return $policy;
1184                 } elseif ( !$policy ) {
1185                         return array();
1186                 }
1187
1188                 $policy = explode( ',', $policy );
1189                 $policy = array_map( 'trim', $policy );
1190
1191                 $arr = array();
1192                 foreach ( $policy as $var ) {
1193                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1194                                 $arr['index'] = $var;
1195                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1196                                 $arr['follow'] = $var;
1197                         }
1198                 }
1199
1200                 return $arr;
1201         }
1202
1203         /**
1204          * If this request is a redirect view, send "redirected from" subtitle to
1205          * $wgOut. Returns true if the header was needed, false if this is not a
1206          * redirect view. Handles both local and remote redirects.
1207          *
1208          * @return boolean
1209          */
1210         public function showRedirectedFromHeader() {
1211                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1212
1213                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1214                 $sk = $wgUser->getSkin();
1215
1216                 if ( isset( $this->mRedirectedFrom ) ) {
1217                         // This is an internally redirected page view.
1218                         // We'll need a backlink to the source page for navigation.
1219                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1220                                 $redir = $sk->link(
1221                                         $this->mRedirectedFrom,
1222                                         null,
1223                                         array(),
1224                                         array( 'redirect' => 'no' ),
1225                                         array( 'known', 'noclasses' )
1226                                 );
1227
1228                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1229                                 $wgOut->setSubtitle( $s );
1230
1231                                 // Set the fragment if one was specified in the redirect
1232                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1233                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1234                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1235                                 }
1236
1237                                 // Add a <link rel="canonical"> tag
1238                                 $wgOut->addLink( array( 'rel' => 'canonical',
1239                                         'href' => $this->mTitle->getLocalURL() )
1240                                 );
1241
1242                                 return true;
1243                         }
1244                 } elseif ( $rdfrom ) {
1245                         // This is an externally redirected view, from some other wiki.
1246                         // If it was reported from a trusted site, supply a backlink.
1247                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1248                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1249                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1250                                 $wgOut->setSubtitle( $s );
1251
1252                                 return true;
1253                         }
1254                 }
1255
1256                 return false;
1257         }
1258
1259         /**
1260          * Show a header specific to the namespace currently being viewed, like
1261          * [[MediaWiki:Talkpagetext]]. For Article::view().
1262          */
1263         public function showNamespaceHeader() {
1264                 global $wgOut;
1265
1266                 if ( $this->mTitle->isTalkPage() ) {
1267                         $msg = wfMsgNoTrans( 'talkpageheader' );
1268                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1269                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1270                         }
1271                 }
1272         }
1273
1274         /**
1275          * Show the footer section of an ordinary page view
1276          */
1277         public function showViewFooter() {
1278                 global $wgOut, $wgUseTrackbacks;
1279
1280                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1281                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1282                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1283                 }
1284
1285                 # If we have been passed an &rcid= parameter, we want to give the user a
1286                 # chance to mark this new article as patrolled.
1287                 $this->showPatrolFooter();
1288
1289                 # Trackbacks
1290                 if ( $wgUseTrackbacks ) {
1291                         $this->addTrackbacks();
1292                 }
1293         }
1294
1295         /**
1296          * If patrol is possible, output a patrol UI box. This is called from the
1297          * footer section of ordinary page views. If patrol is not possible or not
1298          * desired, does nothing.
1299          */
1300         public function showPatrolFooter() {
1301                 global $wgOut, $wgRequest, $wgUser;
1302
1303                 $rcid = $wgRequest->getVal( 'rcid' );
1304
1305                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1306                         return;
1307                 }
1308
1309                 $sk = $wgUser->getSkin();
1310                 $token = $wgUser->editToken();
1311
1312                 $wgOut->addHTML(
1313                         "<div class='patrollink'>" .
1314                                 wfMsgHtml(
1315                                         'markaspatrolledlink',
1316                                         $sk->link(
1317                                                 $this->mTitle,
1318                                                 wfMsgHtml( 'markaspatrolledtext' ),
1319                                                 array(),
1320                                                 array(
1321                                                         'action' => 'markpatrolled',
1322                                                         'rcid' => $rcid,
1323                                                         'token' => $token,
1324                                                 ),
1325                                                 array( 'known', 'noclasses' )
1326                                         )
1327                                 ) .
1328                         '</div>'
1329                 );
1330         }
1331
1332         /**
1333          * Show the error text for a missing article. For articles in the MediaWiki
1334          * namespace, show the default message text. To be called from Article::view().
1335          */
1336         public function showMissingArticle() {
1337                 global $wgOut, $wgRequest, $wgUser;
1338
1339                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1340                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1341                         $parts = explode( '/', $this->mTitle->getText() );
1342                         $rootPart = $parts[0];
1343                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1344                         $ip = User::isIP( $rootPart );
1345
1346                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1347                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1348                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1349                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1350                                 LogEventsList::showLogExtract(
1351                                         $wgOut,
1352                                         'block',
1353                                         $user->getUserPage()->getPrefixedText(),
1354                                         '',
1355                                         array(
1356                                                 'lim' => 1,
1357                                                 'showIfEmpty' => false,
1358                                                 'msgKey' => array(
1359                                                         'blocked-notice-logextract',
1360                                                         $user->getName() # Support GENDER in notice
1361                                                 )
1362                                         )
1363                                 );
1364                         }
1365                 }
1366
1367                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1368
1369                 # Show delete and move logs
1370                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1371                         array(  'lim' => 10,
1372                                 'conds' => array( "log_action != 'revision'" ),
1373                                 'showIfEmpty' => false,
1374                                 'msgKey' => array( 'moveddeleted-notice' ) )
1375                 );
1376
1377                 # Show error message
1378                 $oldid = $this->getOldID();
1379                 if ( $oldid ) {
1380                         $text = wfMsgNoTrans( 'missing-article',
1381                                 $this->mTitle->getPrefixedText(),
1382                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1383                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1384                         // Use the default message text
1385                         $text = $this->getContent();
1386                 } else {
1387                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1388                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1389                         $errors = array_merge( $createErrors, $editErrors );
1390
1391                         if ( !count( $errors ) ) {
1392                                 $text = wfMsgNoTrans( 'noarticletext' );
1393                         } else {
1394                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1395                         }
1396                 }
1397                 $text = "<div class='noarticletext'>\n$text\n</div>";
1398
1399                 if ( !$this->hasViewableContent() ) {
1400                         // If there's no backing content, send a 404 Not Found
1401                         // for better machine handling of broken links.
1402                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1403                 }
1404
1405                 $wgOut->addWikiText( $text );
1406         }
1407
1408         /**
1409          * If the revision requested for view is deleted, check permissions.
1410          * Send either an error message or a warning header to $wgOut.
1411          *
1412          * @return boolean true if the view is allowed, false if not.
1413          */
1414         public function showDeletedRevisionHeader() {
1415                 global $wgOut, $wgRequest;
1416
1417                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1418                         // Not deleted
1419                         return true;
1420                 }
1421
1422                 // If the user is not allowed to see it...
1423                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1424                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1425                                 'rev-deleted-text-permission' );
1426
1427                         return false;
1428                 // If the user needs to confirm that they want to see it...
1429                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1430                         # Give explanation and add a link to view the revision...
1431                         $oldid = intval( $this->getOldID() );
1432                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1433                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1434                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1435                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1436                                 array( $msg, $link ) );
1437
1438                         return false;
1439                 // We are allowed to see...
1440                 } else {
1441                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1442                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1443                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1444
1445                         return true;
1446                 }
1447         }
1448
1449         /**
1450          * Should the parser cache be used?
1451          *
1452          * @return boolean
1453          */
1454         public function useParserCache( $oldid ) {
1455                 global $wgUser, $wgEnableParserCache;
1456
1457                 return $wgEnableParserCache
1458                         && $wgUser->getStubThreshold() == 0
1459                         && $this->exists()
1460                         && empty( $oldid )
1461                         && !$this->mTitle->isCssOrJsPage()
1462                         && !$this->mTitle->isCssJsSubpage();
1463         }
1464
1465         /**
1466          * Execute the uncached parse for action=view
1467          */
1468         public function doViewParse() {
1469                 global $wgOut;
1470
1471                 $oldid = $this->getOldID();
1472                 $useParserCache = $this->useParserCache( $oldid );
1473                 $parserOptions = $this->getParserOptions();
1474
1475                 # Render printable version, use printable version cache
1476                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1477
1478                 # Don't show section-edit links on old revisions... this way lies madness.
1479                 if ( !$this->isCurrent() || $wgOut->isPrintable() ) {
1480                         $parserOptions->setEditSection( false );
1481                 }
1482
1483                 $useParserCache = $this->useParserCache( $oldid );
1484                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1485         }
1486
1487         /**
1488          * Try to fetch an expired entry from the parser cache. If it is present,
1489          * output it and return true. If it is not present, output nothing and
1490          * return false. This is used as a callback function for
1491          * PoolCounter::executeProtected().
1492          *
1493          * @return boolean
1494          */
1495         public function tryDirtyCache() {
1496                 global $wgOut;
1497                 $parserCache = ParserCache::singleton();
1498                 $options = clone $this->getParserOptions();
1499
1500                 if ( $wgOut->isPrintable() ) {
1501                         $options->setIsPrintable( true );
1502                         $options->setEditSection( false );
1503                 }
1504
1505                 $output = $parserCache->getDirty( $this, $options );
1506
1507                 if ( $output ) {
1508                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1509                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1510                         $wgOut->setSquidMaxage( 0 );
1511                         $this->mParserOutput = $output;
1512                         $wgOut->addParserOutput( $output );
1513                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1514
1515                         return true;
1516                 } else {
1517                         wfDebugLog( 'dirty', "dirty missing\n" );
1518                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1519
1520                         return false;
1521                 }
1522         }
1523
1524         /**
1525          * Show an error page for an error from the pool counter.
1526          * @param $status Status
1527          */
1528         public function showPoolError( $status ) {
1529                 global $wgOut;
1530
1531                 $wgOut->clearHTML(); // for release() errors
1532                 $wgOut->enableClientCache( false );
1533                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1534                 $wgOut->addWikiText(
1535                         '<div class="errorbox">' .
1536                         $status->getWikiText( false, 'view-pool-error' ) .
1537                         '</div>'
1538                 );
1539         }
1540
1541         /**
1542          * View redirect
1543          *
1544          * @param $target Title object or Array of destination(s) to redirect
1545          * @param $appendSubtitle Boolean [optional]
1546          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1547          * @return string containing HMTL with redirect link
1548          */
1549         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1550                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1551
1552                 if ( !is_array( $target ) ) {
1553                         $target = array( $target );
1554                 }
1555
1556                 $imageDir = $wgContLang->getDir();
1557
1558                 if ( $appendSubtitle ) {
1559                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1560                 }
1561
1562                 $sk = $wgUser->getSkin();
1563                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1564                 $title = array_shift( $target );
1565
1566                 if ( $forceKnown ) {
1567                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1568                 } else {
1569                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1570                 }
1571
1572                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1573                 $alt = $wgContLang->isRTL() ? '←' : '→';
1574                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1575                 // FIXME: where this happens?
1576                 foreach ( $target as $rt ) {
1577                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1578                         if ( $forceKnown ) {
1579                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText() ) );
1580                         } else {
1581                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1582                         }
1583                 }
1584
1585                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1586                 return Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1587                         '<span class="redirectText">' . $link . '</span>';
1588         }
1589
1590         /**
1591          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1592          */
1593         public function addTrackbacks() {
1594                 global $wgOut, $wgUser;
1595
1596                 $dbr = wfGetDB( DB_SLAVE );
1597                 $tbs = $dbr->select( 'trackbacks',
1598                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1599                         array( 'tb_page' => $this->getID() )
1600                 );
1601
1602                 if ( !$dbr->numRows( $tbs ) ) {
1603                         return;
1604                 }
1605
1606                 $tbtext = "";
1607                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1608                         $rmvtxt = "";
1609
1610                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1611                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1612                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1613                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1614                         }
1615
1616                         $tbtext .= "\n";
1617                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1618                                         $o->tb_title,
1619                                         $o->tb_url,
1620                                         $o->tb_ex,
1621                                         $o->tb_name,
1622                                         $rmvtxt );
1623                 }
1624
1625                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1626         }
1627
1628         /**
1629          * Removes trackback record for current article from trackbacks table
1630          */
1631         public function deletetrackback() {
1632                 global $wgUser, $wgRequest, $wgOut;
1633
1634                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1635                         $wgOut->addWikiMsg( 'sessionfailure' );
1636
1637                         return;
1638                 }
1639
1640                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1641
1642                 if ( count( $permission_errors ) ) {
1643                         $wgOut->showPermissionsErrorPage( $permission_errors );
1644
1645                         return;
1646                 }
1647
1648                 $db = wfGetDB( DB_MASTER );
1649                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1650
1651                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1652                 $this->mTitle->invalidateCache();
1653         }
1654
1655         /**
1656          * Handle action=render
1657          */
1658
1659         public function render() {
1660                 global $wgOut;
1661
1662                 $wgOut->setArticleBodyOnly( true );
1663                 $this->view();
1664         }
1665
1666         /**
1667          * Handle action=purge
1668          */
1669         public function purge() {
1670                 global $wgUser, $wgRequest, $wgOut;
1671
1672                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1673                         //FIXME: shouldn't this be in doPurge()?
1674                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1675                                 $this->doPurge();
1676                                 $this->view();
1677                         }
1678                 } else {
1679                         $formParams = array(
1680                                 'method' => 'post',
1681                                 'action' =>  $wgRequest->getRequestURL(),
1682                         );
1683
1684                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1685
1686                         $form  = Html::openElement( 'form', $formParams );
1687                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1688                         $form .= Html::closeElement( 'form' );
1689
1690                         $wgOut->addHTML( $form );
1691                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1692
1693                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1694                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1695                 }
1696         }
1697
1698         /**
1699          * Perform the actions of a page purging
1700          */
1701         public function doPurge() {
1702                 global $wgUseSquid;
1703
1704                 // Invalidate the cache
1705                 $this->mTitle->invalidateCache();
1706
1707                 if ( $wgUseSquid ) {
1708                         // Commit the transaction before the purge is sent
1709                         $dbw = wfGetDB( DB_MASTER );
1710                         $dbw->commit();
1711
1712                         // Send purge
1713                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1714                         $update->doUpdate();
1715                 }
1716
1717                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1718                         global $wgMessageCache;
1719
1720                         if ( $this->getID() == 0 ) {
1721                                 $text = false;
1722                         } else {
1723                                 $text = $this->getRawText();
1724                         }
1725
1726                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1727                 }
1728         }
1729
1730         /**
1731          * Insert a new empty page record for this article.
1732          * This *must* be followed up by creating a revision
1733          * and running $this->updateRevisionOn( ... );
1734          * or else the record will be left in a funky state.
1735          * Best if all done inside a transaction.
1736          *
1737          * @param $dbw Database
1738          * @return int The newly created page_id key, or false if the title already existed
1739          * @private
1740          */
1741         public function insertOn( $dbw ) {
1742                 wfProfileIn( __METHOD__ );
1743
1744                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1745                 $dbw->insert( 'page', array(
1746                         'page_id'           => $page_id,
1747                         'page_namespace'    => $this->mTitle->getNamespace(),
1748                         'page_title'        => $this->mTitle->getDBkey(),
1749                         'page_counter'      => 0,
1750                         'page_restrictions' => '',
1751                         'page_is_redirect'  => 0, # Will set this shortly...
1752                         'page_is_new'       => 1,
1753                         'page_random'       => wfRandom(),
1754                         'page_touched'      => $dbw->timestamp(),
1755                         'page_latest'       => 0, # Fill this in shortly...
1756                         'page_len'          => 0, # Fill this in shortly...
1757                 ), __METHOD__, 'IGNORE' );
1758
1759                 $affected = $dbw->affectedRows();
1760
1761                 if ( $affected ) {
1762                         $newid = $dbw->insertId();
1763                         $this->mTitle->resetArticleId( $newid );
1764                 }
1765                 wfProfileOut( __METHOD__ );
1766
1767                 return $affected ? $newid : false;
1768         }
1769
1770         /**
1771          * Update the page record to point to a newly saved revision.
1772          *
1773          * @param $dbw Database object
1774          * @param $revision Revision: For ID number, and text used to set
1775                             length and redirect status fields
1776          * @param $lastRevision Integer: if given, will not overwrite the page field
1777          *                      when different from the currently set value.
1778          *                      Giving 0 indicates the new page flag should be set
1779          *                      on.
1780          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1781          *                           removing rows in redirect table.
1782          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1783          *                    Needed when $lastRevision has to be set to sth. !=0
1784          * @return bool true on success, false on failure
1785          * @private
1786          */
1787         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1788                 wfProfileIn( __METHOD__ );
1789
1790                 $text = $revision->getText();
1791                 $rt = Title::newFromRedirectRecurse( $text );
1792
1793                 $conditions = array( 'page_id' => $this->getId() );
1794
1795                 if ( !is_null( $lastRevision ) ) {
1796                         # An extra check against threads stepping on each other
1797                         $conditions['page_latest'] = $lastRevision;
1798                 }
1799
1800                 if ( !$setNewFlag ) {
1801                         $setNewFlag = ( $lastRevision === 0 );
1802                 }
1803
1804                 $dbw->update( 'page',
1805                         array( /* SET */
1806                                 'page_latest'      => $revision->getId(),
1807                                 'page_touched'     => $dbw->timestamp(),
1808                                 'page_is_new'      => $setNewFlag,
1809                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1810                                 'page_len'         => strlen( $text ),
1811                         ),
1812                         $conditions,
1813                         __METHOD__ );
1814
1815                 $result = $dbw->affectedRows() != 0;
1816                 if ( $result ) {
1817                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1818                 }
1819
1820                 wfProfileOut( __METHOD__ );
1821                 return $result;
1822         }
1823
1824         /**
1825          * Add row to the redirect table if this is a redirect, remove otherwise.
1826          *
1827          * @param $dbw Database
1828          * @param $redirectTitle a title object pointing to the redirect target,
1829          *                       or NULL if this is not a redirect
1830          * @param $lastRevIsRedirect If given, will optimize adding and
1831          *                           removing rows in redirect table.
1832          * @return bool true on success, false on failure
1833          * @private
1834          */
1835         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1836                 // Always update redirects (target link might have changed)
1837                 // Update/Insert if we don't know if the last revision was a redirect or not
1838                 // Delete if changing from redirect to non-redirect
1839                 $isRedirect = !is_null( $redirectTitle );
1840
1841                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1842                         wfProfileIn( __METHOD__ );
1843                         if ( $isRedirect ) {
1844                                 $this->insertRedirectEntry( $redirectTitle );
1845                         } else {
1846                                 // This is not a redirect, remove row from redirect table
1847                                 $where = array( 'rd_from' => $this->getId() );
1848                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1849                         }
1850
1851                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1852                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1853                         }
1854                         wfProfileOut( __METHOD__ );
1855
1856                         return ( $dbw->affectedRows() != 0 );
1857                 }
1858
1859                 return true;
1860         }
1861
1862         /**
1863          * If the given revision is newer than the currently set page_latest,
1864          * update the page record. Otherwise, do nothing.
1865          *
1866          * @param $dbw Database object
1867          * @param $revision Revision object
1868          * @return mixed
1869          */
1870         public function updateIfNewerOn( &$dbw, $revision ) {
1871                 wfProfileIn( __METHOD__ );
1872
1873                 $row = $dbw->selectRow(
1874                         array( 'revision', 'page' ),
1875                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1876                         array(
1877                                 'page_id' => $this->getId(),
1878                                 'page_latest=rev_id' ),
1879                         __METHOD__ );
1880
1881                 if ( $row ) {
1882                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1883                                 wfProfileOut( __METHOD__ );
1884                                 return false;
1885                         }
1886                         $prev = $row->rev_id;
1887                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1888                 } else {
1889                         # No or missing previous revision; mark the page as new
1890                         $prev = 0;
1891                         $lastRevIsRedirect = null;
1892                 }
1893
1894                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1895
1896                 wfProfileOut( __METHOD__ );
1897                 return $ret;
1898         }
1899
1900         /**
1901          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1902          * @param $text String: new text of the section
1903          * @param $summary String: new section's subject, only if $section is 'new'
1904          * @param $edittime String: revision timestamp or null to use the current revision
1905          * @return string Complete article text, or null if error
1906          */
1907         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1908                 wfProfileIn( __METHOD__ );
1909
1910                 if ( strval( $section ) == '' ) {
1911                         // Whole-page edit; let the whole text through
1912                 } else {
1913                         if ( is_null( $edittime ) ) {
1914                                 $rev = Revision::newFromTitle( $this->mTitle );
1915                         } else {
1916                                 $dbw = wfGetDB( DB_MASTER );
1917                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1918                         }
1919
1920                         if ( !$rev ) {
1921                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1922                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1923                                 return null;
1924                         }
1925
1926                         $oldtext = $rev->getText();
1927
1928                         if ( $section == 'new' ) {
1929                                 # Inserting a new section
1930                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1931                                 $text = strlen( trim( $oldtext ) ) > 0
1932                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1933                                                 : "{$subject}{$text}";
1934                         } else {
1935                                 # Replacing an existing section; roll out the big guns
1936                                 global $wgParser;
1937
1938                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1939                         }
1940                 }
1941
1942                 wfProfileOut( __METHOD__ );
1943                 return $text;
1944         }
1945
1946         /**
1947          * This function is not deprecated until somebody fixes the core not to use
1948          * it. Nevertheless, use Article::doEdit() instead.
1949          */
1950         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1951                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1952                         ( $isminor ? EDIT_MINOR : 0 ) |
1953                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1954                         ( $bot ? EDIT_FORCE_BOT : 0 );
1955
1956                 # If this is a comment, add the summary as headline
1957                 if ( $comment && $summary != "" ) {
1958                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1959                 }
1960                 $this->doEdit( $text, $summary, $flags );
1961
1962                 $dbw = wfGetDB( DB_MASTER );
1963                 if ( $watchthis ) {
1964                         if ( !$this->mTitle->userIsWatching() ) {
1965                                 $dbw->begin();
1966                                 $this->doWatch();
1967                                 $dbw->commit();
1968                         }
1969                 } else {
1970                         if ( $this->mTitle->userIsWatching() ) {
1971                                 $dbw->begin();
1972                                 $this->doUnwatch();
1973                                 $dbw->commit();
1974                         }
1975                 }
1976                 $this->doRedirect( $this->isRedirect( $text ) );
1977         }
1978
1979         /**
1980          * @deprecated use Article::doEdit()
1981          */
1982         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1983                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1984                         ( $minor ? EDIT_MINOR : 0 ) |
1985                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1986
1987                 $status = $this->doEdit( $text, $summary, $flags );
1988
1989                 if ( !$status->isOK() ) {
1990                         return false;
1991                 }
1992
1993                 $dbw = wfGetDB( DB_MASTER );
1994                 if ( $watchthis ) {
1995                         if ( !$this->mTitle->userIsWatching() ) {
1996                                 $dbw->begin();
1997                                 $this->doWatch();
1998                                 $dbw->commit();
1999                         }
2000                 } else {
2001                         if ( $this->mTitle->userIsWatching() ) {
2002                                 $dbw->begin();
2003                                 $this->doUnwatch();
2004                                 $dbw->commit();
2005                         }
2006                 }
2007
2008                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
2009                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
2010
2011                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
2012                 return true;
2013         }
2014
2015         /**
2016          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
2017          * @param $flags Int
2018          * @return Int updated $flags
2019          */
2020         function checkFlags( $flags ) {
2021                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
2022                         if ( $this->mTitle->getArticleID() ) {
2023                                 $flags |= EDIT_UPDATE;
2024                         } else {
2025                                 $flags |= EDIT_NEW;
2026                         }
2027                 }
2028
2029                 return $flags;
2030         }
2031
2032         /**
2033          * Article::doEdit()
2034          *
2035          * Change an existing article or create a new article. Updates RC and all necessary caches,
2036          * optionally via the deferred update array.
2037          *
2038          * $wgUser must be set before calling this function.
2039          *
2040          * @param $text String: new text
2041          * @param $summary String: edit summary
2042          * @param $flags Integer bitfield:
2043          *      EDIT_NEW
2044          *          Article is known or assumed to be non-existent, create a new one
2045          *      EDIT_UPDATE
2046          *          Article is known or assumed to be pre-existing, update it
2047          *      EDIT_MINOR
2048          *          Mark this edit minor, if the user is allowed to do so
2049          *      EDIT_SUPPRESS_RC
2050          *          Do not log the change in recentchanges
2051          *      EDIT_FORCE_BOT
2052          *          Mark the edit a "bot" edit regardless of user rights
2053          *      EDIT_DEFER_UPDATES
2054          *          Defer some of the updates until the end of index.php
2055          *      EDIT_AUTOSUMMARY
2056          *          Fill in blank summaries with generated text where possible
2057          *
2058          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2059          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2060          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2061          * edit-already-exists error will be returned. These two conditions are also possible with
2062          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2063          *
2064          * @param $baseRevId the revision ID this edit was based off, if any
2065          * @param $user Optional user object, $wgUser will be used if not passed
2066          *
2067          * @return Status object. Possible errors:
2068          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2069          *     edit-gone-missing:       In update mode, but the article didn't exist
2070          *     edit-conflict:           In update mode, the article changed unexpectedly
2071          *     edit-no-change:          Warning that the text was the same as before
2072          *     edit-already-exists:     In creation mode, but the article already exists
2073          *
2074          *  Extensions may define additional errors.
2075          *
2076          *  $return->value will contain an associative array with members as follows:
2077          *     new:                     Boolean indicating if the function attempted to create a new article
2078          *     revision:                The revision object for the inserted revision, or null
2079          *
2080          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2081          */
2082         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2083                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2084
2085                 # Low-level sanity check
2086                 if ( $this->mTitle->getText() === '' ) {
2087                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2088                 }
2089
2090                 wfProfileIn( __METHOD__ );
2091
2092                 $user = is_null( $user ) ? $wgUser : $user;
2093                 $status = Status::newGood( array() );
2094
2095                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2096                 $this->loadPageData();
2097
2098                 $flags = $this->checkFlags( $flags );
2099
2100                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2101                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2102                 {
2103                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2104                         wfProfileOut( __METHOD__ );
2105
2106                         if ( $status->isOK() ) {
2107                                 $status->fatal( 'edit-hook-aborted' );
2108                         }
2109
2110                         return $status;
2111                 }
2112
2113                 # Silently ignore EDIT_MINOR if not allowed
2114                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2115                 $bot = $flags & EDIT_FORCE_BOT;
2116
2117                 $oldtext = $this->getRawText(); // current revision
2118                 $oldsize = strlen( $oldtext );
2119
2120                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2121                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2122                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2123                 }
2124
2125                 $editInfo = $this->prepareTextForEdit( $text );
2126                 $text = $editInfo->pst;
2127                 $newsize = strlen( $text );
2128
2129                 $dbw = wfGetDB( DB_MASTER );
2130                 $now = wfTimestampNow();
2131                 $this->mTimestamp = $now;
2132
2133                 if ( $flags & EDIT_UPDATE ) {
2134                         # Update article, but only if changed.
2135                         $status->value['new'] = false;
2136
2137                         # Make sure the revision is either completely inserted or not inserted at all
2138                         if ( !$wgDBtransactions ) {
2139                                 $userAbort = ignore_user_abort( true );
2140                         }
2141
2142                         $revisionId = 0;
2143
2144                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2145
2146                         if ( $changed ) {
2147                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2148                                   - (int)$this->isCountable( $oldtext );
2149                                 $this->mTotalAdjustment = 0;
2150
2151                                 if ( !$this->mLatest ) {
2152                                         # Article gone missing
2153                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2154                                         $status->fatal( 'edit-gone-missing' );
2155
2156                                         wfProfileOut( __METHOD__ );
2157                                         return $status;
2158                                 }
2159
2160                                 $revision = new Revision( array(
2161                                         'page'       => $this->getId(),
2162                                         'comment'    => $summary,
2163                                         'minor_edit' => $isminor,
2164                                         'text'       => $text,
2165                                         'parent_id'  => $this->mLatest,
2166                                         'user'       => $user->getId(),
2167                                         'user_text'  => $user->getName(),
2168                                 ) );
2169
2170                                 $dbw->begin();
2171                                 $revisionId = $revision->insertOn( $dbw );
2172
2173                                 # Update page
2174                                 #
2175                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2176                                 # during the course of this function. This makes sure that EditPage can detect
2177                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2178                                 # before this function is called. A previous function used a separate query, this
2179                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2180                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2181
2182                                 if ( !$ok ) {
2183                                         /* Belated edit conflict! Run away!! */
2184                                         $status->fatal( 'edit-conflict' );
2185
2186                                         # Delete the invalid revision if the DB is not transactional
2187                                         if ( !$wgDBtransactions ) {
2188                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2189                                         }
2190
2191                                         $revisionId = 0;
2192                                         $dbw->rollback();
2193                                 } else {
2194                                         global $wgUseRCPatrol;
2195                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2196                                         # Update recentchanges
2197                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2198                                                 # Mark as patrolled if the user can do so
2199                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2200                                                 # Add RC row to the DB
2201                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2202                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2203                                                         $revisionId, $patrolled
2204                                                 );
2205
2206                                                 # Log auto-patrolled edits
2207                                                 if ( $patrolled ) {
2208                                                         PatrolLog::record( $rc, true );
2209                                                 }
2210                                         }
2211                                         $user->incEditCount();
2212                                         $dbw->commit();
2213                                 }
2214                         } else {
2215                                 $status->warning( 'edit-no-change' );
2216                                 $revision = null;
2217                                 // Keep the same revision ID, but do some updates on it
2218                                 $revisionId = $this->getRevIdFetched();
2219                                 // Update page_touched, this is usually implicit in the page update
2220                                 // Other cache updates are done in onArticleEdit()
2221                                 $this->mTitle->invalidateCache();
2222                         }
2223
2224                         if ( !$wgDBtransactions ) {
2225                                 ignore_user_abort( $userAbort );
2226                         }
2227
2228                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2229                         if ( !$status->isOK() ) {
2230                                 wfProfileOut( __METHOD__ );
2231                                 return $status;
2232                         }
2233
2234                         # Invalidate cache of this article and all pages using this article
2235                         # as a template. Partly deferred.
2236                         Article::onArticleEdit( $this->mTitle );
2237                         # Update links tables, site stats, etc.
2238                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2239                 } else {
2240                         # Create new article
2241                         $status->value['new'] = true;
2242
2243                         # Set statistics members
2244                         # We work out if it's countable after PST to avoid counter drift
2245                         # when articles are created with {{subst:}}
2246                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2247                         $this->mTotalAdjustment = 1;
2248
2249                         $dbw->begin();
2250
2251                         # Add the page record; stake our claim on this title!
2252                         # This will return false if the article already exists
2253                         $newid = $this->insertOn( $dbw );
2254
2255                         if ( $newid === false ) {
2256                                 $dbw->rollback();
2257                                 $status->fatal( 'edit-already-exists' );
2258
2259                                 wfProfileOut( __METHOD__ );
2260                                 return $status;
2261                         }
2262
2263                         # Save the revision text...
2264                         $revision = new Revision( array(
2265                                 'page'       => $newid,
2266                                 'comment'    => $summary,
2267                                 'minor_edit' => $isminor,
2268                                 'text'       => $text,
2269                                 'user'       => $user->getId(),
2270                                 'user_text'  => $user->getName(),
2271                                 ) );
2272                         $revisionId = $revision->insertOn( $dbw );
2273
2274                         $this->mTitle->resetArticleID( $newid );
2275
2276                         # Update the page record with revision data
2277                         $this->updateRevisionOn( $dbw, $revision, 0 );
2278
2279                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2280
2281                         # Update recentchanges
2282                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2283                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2284
2285                                 # Mark as patrolled if the user can do so
2286                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
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 );
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          * @deprecated wrapper for doRedirect
2326          */
2327         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2328                 wfDeprecated( __METHOD__ );
2329                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2330         }
2331
2332         /**
2333          * Output a redirect back to the article.
2334          * This is typically used after an edit.
2335          *
2336          * @param $noRedir Boolean: add redirect=no
2337          * @param $sectionAnchor String: section to redirect to, including "#"
2338          * @param $extraQuery String: extra query params
2339          */
2340         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2341                 global $wgOut;
2342
2343                 if ( $noRedir ) {
2344                         $query = 'redirect=no';
2345                         if ( $extraQuery )
2346                                 $query .= "&$extraQuery";
2347                 } else {
2348                         $query = $extraQuery;
2349                 }
2350
2351                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2352         }
2353
2354         /**
2355          * Mark this particular edit/page as patrolled
2356          */
2357         public function markpatrolled() {
2358                 global $wgOut, $wgUser, $wgRequest;
2359
2360                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2361
2362                 # If we haven't been given an rc_id value, we can't do anything
2363                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2364
2365                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
2366                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2367                         return;
2368                 }
2369
2370                 $rc = RecentChange::newFromId( $rcid );
2371
2372                 if ( is_null( $rc ) ) {
2373                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2374                         return;
2375                 }
2376
2377                 # It would be nice to see where the user had actually come from, but for now just guess
2378                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2379                 $return = SpecialPage::getTitleFor( $returnto );
2380
2381                 $errors = $rc->doMarkPatrolled();
2382
2383                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2384                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2385
2386                         return;
2387                 }
2388
2389                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2390                         // The hook itself has handled any output
2391                         return;
2392                 }
2393
2394                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2395                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2396                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2397                         $wgOut->returnToMain( false, $return );
2398
2399                         return;
2400                 }
2401
2402                 if ( !empty( $errors ) ) {
2403                         $wgOut->showPermissionsErrorPage( $errors );
2404
2405                         return;
2406                 }
2407
2408                 # Inform the user
2409                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2410                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2411                 $wgOut->returnToMain( false, $return );
2412         }
2413
2414         /**
2415          * User-interface handler for the "watch" action
2416          */
2417         public function watch() {
2418                 global $wgUser, $wgOut;
2419
2420                 if ( $wgUser->isAnon() ) {
2421                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2422                         return;
2423                 }
2424
2425                 if ( wfReadOnly() ) {
2426                         $wgOut->readOnlyPage();
2427                         return;
2428                 }
2429
2430                 if ( $this->doWatch() ) {
2431                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2432                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2433                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2434                 }
2435
2436                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2437         }
2438
2439         /**
2440          * Add this page to $wgUser's watchlist
2441          * @return bool true on successful watch operation
2442          */
2443         public function doWatch() {
2444                 global $wgUser;
2445
2446                 if ( $wgUser->isAnon() ) {
2447                         return false;
2448                 }
2449
2450                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2451                         $wgUser->addWatch( $this->mTitle );
2452                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2453                 }
2454
2455                 return false;
2456         }
2457
2458         /**
2459          * User interface handler for the "unwatch" action.
2460          */
2461         public function unwatch() {
2462                 global $wgUser, $wgOut;
2463
2464                 if ( $wgUser->isAnon() ) {
2465                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2466                         return;
2467                 }
2468
2469                 if ( wfReadOnly() ) {
2470                         $wgOut->readOnlyPage();
2471                         return;
2472                 }
2473
2474                 if ( $this->doUnwatch() ) {
2475                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2476                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2477                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2478                 }
2479
2480                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2481         }
2482
2483         /**
2484          * Stop watching a page
2485          * @return bool true on successful unwatch
2486          */
2487         public function doUnwatch() {
2488                 global $wgUser;
2489
2490                 if ( $wgUser->isAnon() ) {
2491                         return false;
2492                 }
2493
2494                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2495                         $wgUser->removeWatch( $this->mTitle );
2496                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2497                 }
2498
2499                 return false;
2500         }
2501
2502         /**
2503          * action=protect handler
2504          */
2505         public function protect() {
2506                 $form = new ProtectionForm( $this );
2507                 $form->execute();
2508         }
2509
2510         /**
2511          * action=unprotect handler (alias)
2512          */
2513         public function unprotect() {
2514                 $this->protect();
2515         }
2516
2517         /**
2518          * Update the article's restriction field, and leave a log entry.
2519          *
2520          * @param $limit Array: set of restriction keys
2521          * @param $reason String
2522          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2523          * @param $expiry Array: per restriction type expiration
2524          * @return bool true on success
2525          */
2526         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2527                 global $wgUser, $wgContLang;
2528
2529                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2530
2531                 $id = $this->mTitle->getArticleID();
2532
2533                 if ( $id <= 0 ) {
2534                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2535                         return false;
2536                 }
2537
2538                 if ( wfReadOnly() ) {
2539                         wfDebug( "updateRestrictions failed: read-only\n" );
2540                         return false;
2541                 }
2542
2543                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2544                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2545                         return false;
2546                 }
2547
2548                 if ( !$cascade ) {
2549                         $cascade = false;
2550                 }
2551
2552                 // Take this opportunity to purge out expired restrictions
2553                 Title::purgeExpiredRestrictions();
2554
2555                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2556                 # we expect a single selection, but the schema allows otherwise.
2557                 $current = array();
2558                 $updated = Article::flattenRestrictions( $limit );
2559                 $changed = false;
2560
2561                 foreach ( $restrictionTypes as $action ) {
2562                         if ( isset( $expiry[$action] ) ) {
2563                                 # Get current restrictions on $action
2564                                 $aLimits = $this->mTitle->getRestrictions( $action );
2565                                 $current[$action] = implode( '', $aLimits );
2566                                 # Are any actual restrictions being dealt with here?
2567                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2568
2569                                 # If something changed, we need to log it. Checking $aRChanged
2570                                 # assures that "unprotecting" a page that is not protected does
2571                                 # not log just because the expiry was "changed".
2572                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2573                                         $changed = true;
2574                                 }
2575                         }
2576                 }
2577
2578                 $current = Article::flattenRestrictions( $current );
2579
2580                 $changed = ( $changed || $current != $updated );
2581                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2582                 $protect = ( $updated != '' );
2583
2584                 # If nothing's changed, do nothing
2585                 if ( $changed ) {
2586                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2587                                 $dbw = wfGetDB( DB_MASTER );
2588
2589                                 # Prepare a null revision to be added to the history
2590                                 $modified = $current != '' && $protect;
2591
2592                                 if ( $protect ) {
2593                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2594                                 } else {
2595                                         $comment_type = 'unprotectedarticle';
2596                                 }
2597
2598                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2599
2600                                 # Only restrictions with the 'protect' right can cascade...
2601                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2602                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2603
2604                                 # The schema allows multiple restrictions
2605                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2606                                         $cascade = false;
2607                                 }
2608
2609                                 $cascade_description = '';
2610
2611                                 if ( $cascade ) {
2612                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2613                                 }
2614
2615                                 if ( $reason ) {
2616                                         $comment .= ": $reason";
2617                                 }
2618
2619                                 $editComment = $comment;
2620                                 $encodedExpiry = array();
2621                                 $protect_description = '';
2622                                 foreach ( $limit as $action => $restrictions ) {
2623                                         if ( !isset( $expiry[$action] ) )
2624                                                 $expiry[$action] = 'infinite';
2625
2626                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2627                                         if ( $restrictions != '' ) {
2628                                                 $protect_description .= "[$action=$restrictions] (";
2629                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2630                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2631                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2632                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2633                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2634                                                 } else {
2635                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2636                                                 }
2637
2638                                                 $protect_description .= ') ';
2639                                         }
2640                                 }
2641                                 $protect_description = trim( $protect_description );
2642
2643                                 if ( $protect_description && $protect ) {
2644                                         $editComment .= " ($protect_description)";
2645                                 }
2646
2647                                 if ( $cascade ) {
2648                                         $editComment .= "$cascade_description";
2649                                 }
2650
2651                                 # Update restrictions table
2652                                 foreach ( $limit as $action => $restrictions ) {
2653                                         if ( $restrictions != '' ) {
2654                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2655                                                         array( 'pr_page' => $id,
2656                                                                 'pr_type' => $action,
2657                                                                 'pr_level' => $restrictions,
2658                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2659                                                                 'pr_expiry' => $encodedExpiry[$action]
2660                                                         ),
2661                                                         __METHOD__
2662                                                 );
2663                                         } else {
2664                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2665                                                         'pr_type' => $action ), __METHOD__ );
2666                                         }
2667                                 }
2668
2669                                 # Insert a null revision
2670                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2671                                 $nullRevId = $nullRevision->insertOn( $dbw );
2672
2673                                 $latest = $this->getLatest();
2674                                 # Update page record
2675                                 $dbw->update( 'page',
2676                                         array( /* SET */
2677                                                 'page_touched' => $dbw->timestamp(),
2678                                                 'page_restrictions' => '',
2679                                                 'page_latest' => $nullRevId
2680                                         ), array( /* WHERE */
2681                                                 'page_id' => $id
2682                                         ), 'Article::protect'
2683                                 );
2684
2685                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2686                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2687
2688                                 # Update the protection log
2689                                 $log = new LogPage( 'protect' );
2690                                 if ( $protect ) {
2691                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2692                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2693                                 } else {
2694                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2695                                 }
2696                         } # End hook
2697                 } # End "changed" check
2698
2699                 return true;
2700         }
2701
2702         /**
2703          * Take an array of page restrictions and flatten it to a string
2704          * suitable for insertion into the page_restrictions field.
2705          * @param $limit Array
2706          * @return String
2707          */
2708         protected static function flattenRestrictions( $limit ) {
2709                 if ( !is_array( $limit ) ) {
2710                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2711                 }
2712
2713                 $bits = array();
2714                 ksort( $limit );
2715
2716                 foreach ( $limit as $action => $restrictions ) {
2717                         if ( $restrictions != '' ) {
2718                                 $bits[] = "$action=$restrictions";
2719                         }
2720                 }
2721
2722                 return implode( ':', $bits );
2723         }
2724
2725         /**
2726          * Auto-generates a deletion reason
2727          *
2728          * @param &$hasHistory Boolean: whether the page has a history
2729          * @return mixed String containing deletion reason or empty string, or boolean false
2730          *    if no revision occurred
2731          */
2732         public function generateReason( &$hasHistory ) {
2733                 global $wgContLang;
2734
2735                 $dbw = wfGetDB( DB_MASTER );
2736                 // Get the last revision
2737                 $rev = Revision::newFromTitle( $this->mTitle );
2738
2739                 if ( is_null( $rev ) ) {
2740                         return false;
2741                 }
2742
2743                 // Get the article's contents
2744                 $contents = $rev->getText();
2745                 $blank = false;
2746
2747                 // If the page is blank, use the text from the previous revision,
2748                 // which can only be blank if there's a move/import/protect dummy revision involved
2749                 if ( $contents == '' ) {
2750                         $prev = $rev->getPrevious();
2751
2752                         if ( $prev )    {
2753                                 $contents = $prev->getText();
2754                                 $blank = true;
2755                         }
2756                 }
2757
2758                 // Find out if there was only one contributor
2759                 // Only scan the last 20 revisions
2760                 $res = $dbw->select( 'revision', 'rev_user_text',
2761                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2762                         __METHOD__,
2763                         array( 'LIMIT' => 20 )
2764                 );
2765
2766                 if ( $res === false ) {
2767                         // This page has no revisions, which is very weird
2768                         return false;
2769                 }
2770
2771                 $hasHistory = ( $res->numRows() > 1 );
2772                 $row = $dbw->fetchObject( $res );
2773
2774                 if ( $row ) { // $row is false if the only contributor is hidden
2775                         $onlyAuthor = $row->rev_user_text;
2776                         // Try to find a second contributor
2777                         foreach ( $res as $row ) {
2778                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2779                                         $onlyAuthor = false;
2780                                         break;
2781                                 }
2782                         }
2783                 } else {
2784                         $onlyAuthor = false;
2785                 }
2786
2787                 // Generate the summary with a '$1' placeholder
2788                 if ( $blank ) {
2789                         // The current revision is blank and the one before is also
2790                         // blank. It's just not our lucky day
2791                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2792                 } else {
2793                         if ( $onlyAuthor ) {
2794                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2795                         } else {
2796                                 $reason = wfMsgForContent( 'excontent', '$1' );
2797                         }
2798                 }
2799
2800                 if ( $reason == '-' ) {
2801                         // Allow these UI messages to be blanked out cleanly
2802                         return '';
2803                 }
2804
2805                 // Replace newlines with spaces to prevent uglyness
2806                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2807                 // Calculate the maximum amount of chars to get
2808                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2809                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2810                 $contents = $wgContLang->truncate( $contents, $maxLength );
2811                 // Remove possible unfinished links
2812                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2813                 // Now replace the '$1' placeholder
2814                 $reason = str_replace( '$1', $contents, $reason );
2815
2816                 return $reason;
2817         }
2818
2819
2820         /*
2821          * UI entry point for page deletion
2822          */
2823         public function delete() {
2824                 global $wgUser, $wgOut, $wgRequest;
2825
2826                 $confirm = $wgRequest->wasPosted() &&
2827                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2828
2829                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2830                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2831
2832                 $reason = $this->DeleteReasonList;
2833
2834                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2835                         // Entry from drop down menu + additional comment
2836                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2837                 } elseif ( $reason == 'other' ) {
2838                         $reason = $this->DeleteReason;
2839                 }
2840
2841                 # Flag to hide all contents of the archived revisions
2842                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2843
2844                 # This code desperately needs to be totally rewritten
2845
2846                 # Read-only check...
2847                 if ( wfReadOnly() ) {
2848                         $wgOut->readOnlyPage();
2849
2850                         return;
2851                 }
2852
2853                 # Check permissions
2854                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2855
2856                 if ( count( $permission_errors ) > 0 ) {
2857                         $wgOut->showPermissionsErrorPage( $permission_errors );
2858
2859                         return;
2860                 }
2861
2862                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2863
2864                 # Better double-check that it hasn't been deleted yet!
2865                 $dbw = wfGetDB( DB_MASTER );
2866                 $conds = $this->mTitle->pageCond();
2867                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2868                 if ( $latest === false ) {
2869                         $wgOut->showFatalError(
2870                                 Html::rawElement(
2871                                         'div',
2872                                         array( 'class' => 'error mw-error-cannotdelete' ),
2873                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2874                                 )
2875                         );
2876                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2877                         LogEventsList::showLogExtract(
2878                                 $wgOut,
2879                                 'delete',
2880                                 $this->mTitle->getPrefixedText()
2881                         );
2882
2883                         return;
2884                 }
2885
2886                 # Hack for big sites
2887                 $bigHistory = $this->isBigDeletion();
2888                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2889                         global $wgLang, $wgDeleteRevisionsLimit;
2890
2891                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2892                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2893
2894                         return;
2895                 }
2896
2897                 if ( $confirm ) {
2898                         $this->doDelete( $reason, $suppress );
2899
2900                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2901                                 $this->doWatch();
2902                         } elseif ( $this->mTitle->userIsWatching() ) {
2903                                 $this->doUnwatch();
2904                         }
2905
2906                         return;
2907                 }
2908
2909                 // Generate deletion reason
2910                 $hasHistory = false;
2911                 if ( !$reason ) {
2912                         $reason = $this->generateReason( $hasHistory );
2913                 }
2914
2915                 // If the page has a history, insert a warning
2916                 if ( $hasHistory && !$confirm ) {
2917                         global $wgLang;
2918
2919                         $skin = $wgUser->getSkin();
2920                         $revisions = $this->estimateRevisionCount();
2921                         //FIXME: lego
2922                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2923                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2924                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2925                                 '</strong>'
2926                         );
2927
2928                         if ( $bigHistory ) {
2929                                 global $wgDeleteRevisionsLimit;
2930                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2931                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2932                         }
2933                 }
2934
2935                 return $this->confirmDelete( $reason );
2936         }
2937
2938         /**
2939          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2940          */
2941         public function isBigDeletion() {
2942                 global $wgDeleteRevisionsLimit;
2943
2944                 if ( $wgDeleteRevisionsLimit ) {
2945                         $revCount = $this->estimateRevisionCount();
2946
2947                         return $revCount > $wgDeleteRevisionsLimit;
2948                 }
2949
2950                 return false;
2951         }
2952
2953         /**
2954          * @return int approximate revision count
2955          */
2956         public function estimateRevisionCount() {
2957                 $dbr = wfGetDB( DB_SLAVE );
2958
2959                 // For an exact count...
2960                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2961                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2962                 return $dbr->estimateRowCount( 'revision', '*',
2963                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2964         }
2965
2966         /**
2967          * Get the last N authors
2968          * @param $num Integer: number of revisions to get
2969          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2970          * @return array Array of authors, duplicates not removed
2971          */
2972         public function getLastNAuthors( $num, $revLatest = 0 ) {
2973                 wfProfileIn( __METHOD__ );
2974                 // First try the slave
2975                 // If that doesn't have the latest revision, try the master
2976                 $continue = 2;
2977                 $db = wfGetDB( DB_SLAVE );
2978
2979                 do {
2980                         $res = $db->select( array( 'page', 'revision' ),
2981                                 array( 'rev_id', 'rev_user_text' ),
2982                                 array(
2983                                         'page_namespace' => $this->mTitle->getNamespace(),
2984                                         'page_title' => $this->mTitle->getDBkey(),
2985                                         'rev_page = page_id'
2986                                 ), __METHOD__, $this->getSelectOptions( array(
2987                                         'ORDER BY' => 'rev_timestamp DESC',
2988                                         'LIMIT' => $num
2989                                 ) )
2990                         );
2991
2992                         if ( !$res ) {
2993                                 wfProfileOut( __METHOD__ );
2994                                 return array();
2995                         }
2996
2997                         $row = $db->fetchObject( $res );
2998
2999                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
3000                                 $db = wfGetDB( DB_MASTER );
3001                                 $continue--;
3002                         } else {
3003                                 $continue = 0;
3004                         }
3005                 } while ( $continue );
3006
3007                 $authors = array( $row->rev_user_text );
3008
3009                 while ( $row = $db->fetchObject( $res ) ) {
3010                         $authors[] = $row->rev_user_text;
3011                 }
3012
3013                 wfProfileOut( __METHOD__ );
3014                 return $authors;
3015         }
3016
3017         /**
3018          * Output deletion confirmation dialog
3019          * FIXME: Move to another file?
3020          * @param $reason String: prefilled reason
3021          */
3022         public function confirmDelete( $reason ) {
3023                 global $wgOut, $wgUser;
3024
3025                 wfDebug( "Article::confirmDelete\n" );
3026
3027                 $deleteBackLink = $wgUser->getSkin()->linkKnown( $this->mTitle );
3028                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
3029                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3030                 $wgOut->addWikiMsg( 'confirmdeletetext' );
3031
3032                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
3033
3034                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
3035                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
3036                                         <td></td>
3037                                         <td class='mw-input'><strong>" .
3038                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
3039                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
3040                                         "</strong></td>
3041                                 </tr>";
3042                 } else {
3043                         $suppress = '';
3044                 }
3045                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3046
3047                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3048                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3049                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3050                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3051                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3052                         "<tr id=\"wpDeleteReasonListRow\">
3053                                 <td class='mw-label'>" .
3054                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3055                                 "</td>
3056                                 <td class='mw-input'>" .
3057                                         Xml::listDropDown( 'wpDeleteReasonList',
3058                                                 wfMsgForContent( 'deletereason-dropdown' ),
3059                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3060                                 "</td>
3061                         </tr>
3062                         <tr id=\"wpDeleteReasonRow\">
3063                                 <td class='mw-label'>" .
3064                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3065                                 "</td>
3066                                 <td class='mw-input'>" .
3067                                 Html::input( 'wpReason', $reason, 'text', array(
3068                                         'size' => '60',
3069                                         'maxlength' => '255',
3070                                         'tabindex' => '2',
3071                                         'id' => 'wpReason',
3072                                         'autofocus'
3073                                 ) ) .
3074                                 "</td>
3075                         </tr>";
3076
3077                 # Disallow watching if user is not logged in
3078                 if ( $wgUser->isLoggedIn() ) {
3079                         $form .= "
3080                         <tr>
3081                                 <td></td>
3082                                 <td class='mw-input'>" .
3083                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3084                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3085                                 "</td>
3086                         </tr>";
3087                 }
3088
3089                 $form .= "
3090                         $suppress
3091                         <tr>
3092                                 <td></td>
3093                                 <td class='mw-submit'>" .
3094                                         Xml::submitButton( wfMsg( 'deletepage' ),
3095                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3096                                 "</td>
3097                         </tr>" .
3098                         Xml::closeElement( 'table' ) .
3099                         Xml::closeElement( 'fieldset' ) .
3100                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
3101                         Xml::closeElement( 'form' );
3102
3103                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
3104                                 $skin = $wgUser->getSkin();
3105                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3106                                 $link = $skin->link(
3107                                         $title,
3108                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3109                                         array(),
3110                                         array( 'action' => 'edit' )
3111                                 );
3112                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3113                         }
3114
3115                 $wgOut->addHTML( $form );
3116                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3117                 LogEventsList::showLogExtract( $wgOut, 'delete',
3118                         $this->mTitle->getPrefixedText()
3119                 );
3120         }
3121
3122         /**
3123          * Perform a deletion and output success or failure messages
3124          */
3125         public function doDelete( $reason, $suppress = false ) {
3126                 global $wgOut, $wgUser;
3127
3128                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3129
3130                 $error = '';
3131                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3132                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
3133                                 $deleted = $this->mTitle->getPrefixedText();
3134
3135                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3136                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3137
3138                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3139
3140                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3141                                 $wgOut->returnToMain( false );
3142                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3143                         }
3144                 } else {
3145                         if ( $error == '' ) {
3146                                 $wgOut->showFatalError(
3147                                         Html::rawElement(
3148                                                 'div',
3149                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3150                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3151                                         )
3152                                 );
3153
3154                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3155
3156                                 LogEventsList::showLogExtract(
3157                                         $wgOut,
3158                                         'delete',
3159                                         $this->mTitle->getPrefixedText()
3160                                 );
3161                         } else {
3162                                 $wgOut->showFatalError( $error );
3163                         }
3164                 }
3165         }
3166
3167         /**
3168          * Back-end article deletion
3169          * Deletes the article with database consistency, writes logs, purges caches
3170          *
3171          * @param $reason string delete reason for deletion log
3172          * @param suppress bitfield
3173          *      Revision::DELETED_TEXT
3174          *      Revision::DELETED_COMMENT
3175          *      Revision::DELETED_USER
3176          *      Revision::DELETED_RESTRICTED
3177          * @param $id int article ID
3178          * @param $commit boolean defaults to true, triggers transaction end
3179          * @return boolean true if successful
3180          */
3181         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
3182                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3183
3184                 wfDebug( __METHOD__ . "\n" );
3185
3186                 $dbw = wfGetDB( DB_MASTER );
3187                 $t = $this->mTitle->getDBkey();
3188                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3189
3190                 if ( $t === '' || $id == 0 ) {
3191                         return false;
3192                 }
3193
3194                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3195                 array_push( $wgDeferredUpdateList, $u );
3196
3197                 // Bitfields to further suppress the content
3198                 if ( $suppress ) {
3199                         $bitfield = 0;
3200                         // This should be 15...
3201                         $bitfield |= Revision::DELETED_TEXT;
3202                         $bitfield |= Revision::DELETED_COMMENT;
3203                         $bitfield |= Revision::DELETED_USER;
3204                         $bitfield |= Revision::DELETED_RESTRICTED;
3205                 } else {
3206                         $bitfield = 'rev_deleted';
3207                 }
3208
3209                 $dbw->begin();
3210                 // For now, shunt the revision data into the archive table.
3211                 // Text is *not* removed from the text table; bulk storage
3212                 // is left intact to avoid breaking block-compression or
3213                 // immutable storage schemes.
3214                 //
3215                 // For backwards compatibility, note that some older archive
3216                 // table entries will have ar_text and ar_flags fields still.
3217                 //
3218                 // In the future, we may keep revisions and mark them with
3219                 // the rev_deleted field, which is reserved for this purpose.
3220                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3221                         array(
3222                                 'ar_namespace'  => 'page_namespace',
3223                                 'ar_title'      => 'page_title',
3224                                 'ar_comment'    => 'rev_comment',
3225                                 'ar_user'       => 'rev_user',
3226                                 'ar_user_text'  => 'rev_user_text',
3227                                 'ar_timestamp'  => 'rev_timestamp',
3228                                 'ar_minor_edit' => 'rev_minor_edit',
3229                                 'ar_rev_id'     => 'rev_id',
3230                                 'ar_text_id'    => 'rev_text_id',
3231                                 'ar_text'       => '\'\'', // Be explicit to appease
3232                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3233                                 'ar_len'        => 'rev_len',
3234                                 'ar_page_id'    => 'page_id',
3235                                 'ar_deleted'    => $bitfield
3236                         ), array(
3237                                 'page_id' => $id,
3238                                 'page_id = rev_page'
3239                         ), __METHOD__
3240                 );
3241
3242                 # Delete restrictions for it
3243                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3244
3245                 # Now that it's safely backed up, delete it
3246                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3247                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3248
3249                 if ( !$ok ) {
3250                         $dbw->rollback();
3251                         return false;
3252                 }
3253
3254                 # Fix category table counts
3255                 $cats = array();
3256                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3257
3258                 foreach ( $res as $row ) {
3259                         $cats [] = $row->cl_to;
3260                 }
3261
3262                 $this->updateCategoryCounts( array(), $cats );
3263
3264                 # If using cascading deletes, we can skip some explicit deletes
3265                 if ( !$dbw->cascadingDeletes() ) {
3266                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3267
3268                         if ( $wgUseTrackbacks )
3269                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3270
3271                         # Delete outgoing links
3272                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3273                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3274                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3275                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3276                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3277                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3278                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3279                 }
3280
3281                 # If using cleanup triggers, we can skip some manual deletes
3282                 if ( !$dbw->cleanupTriggers() ) {
3283                         # Clean up recentchanges entries...
3284                         $dbw->delete( 'recentchanges',
3285                                 array( 'rc_type != ' . RC_LOG,
3286                                         'rc_namespace' => $this->mTitle->getNamespace(),
3287                                         'rc_title' => $this->mTitle->getDBkey() ),
3288                                 __METHOD__ );
3289                         $dbw->delete( 'recentchanges',
3290                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3291                                 __METHOD__ );
3292                 }
3293
3294                 # Clear caches
3295                 Article::onArticleDelete( $this->mTitle );
3296
3297                 # Clear the cached article id so the interface doesn't act like we exist
3298                 $this->mTitle->resetArticleID( 0 );
3299
3300                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3301                 $logtype = $suppress ? 'suppress' : 'delete';
3302                 $log = new LogPage( $logtype );
3303
3304                 # Make sure logging got through
3305                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3306
3307                 if ( $commit ) {
3308                         $dbw->commit();
3309                 }
3310
3311                 return true;
3312         }
3313
3314         /**
3315          * Roll back the most recent consecutive set of edits to a page
3316          * from the same user; fails if there are no eligible edits to
3317          * roll back to, e.g. user is the sole contributor. This function
3318          * performs permissions checks on $wgUser, then calls commitRollback()
3319          * to do the dirty work
3320          *
3321          * @param $fromP String: Name of the user whose edits to rollback.
3322          * @param $summary String: Custom summary. Set to default summary if empty.
3323          * @param $token String: Rollback token.
3324          * @param $bot Boolean: If true, mark all reverted edits as bot.
3325          *
3326          * @param $resultDetails Array: contains result-specific array of additional values
3327          *    'alreadyrolled' : 'current' (rev)
3328          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3329          *
3330          * @return array of errors, each error formatted as
3331          *   array(messagekey, param1, param2, ...).
3332          * On success, the array is empty.  This array can also be passed to
3333          * OutputPage::showPermissionsErrorPage().
3334          */
3335         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3336                 global $wgUser;
3337
3338                 $resultDetails = null;
3339
3340                 # Check permissions
3341                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3342                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3343                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3344
3345                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3346                         $errors[] = array( 'sessionfailure' );
3347                 }
3348
3349                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3350                         $errors[] = array( 'actionthrottledtext' );
3351                 }
3352
3353                 # If there were errors, bail out now
3354                 if ( !empty( $errors ) ) {
3355                         return $errors;
3356                 }
3357
3358                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3359         }
3360
3361         /**
3362          * Backend implementation of doRollback(), please refer there for parameter
3363          * and return value documentation
3364          *
3365          * NOTE: This function does NOT check ANY permissions, it just commits the
3366          * rollback to the DB Therefore, you should only call this function direct-
3367          * ly if you want to use custom permissions checks. If you don't, use
3368          * doRollback() instead.
3369          */
3370         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3371                 global $wgUseRCPatrol, $wgUser, $wgLang;
3372
3373                 $dbw = wfGetDB( DB_MASTER );
3374
3375                 if ( wfReadOnly() ) {
3376                         return array( array( 'readonlytext' ) );
3377                 }
3378
3379                 # Get the last editor
3380                 $current = Revision::newFromTitle( $this->mTitle );
3381                 if ( is_null( $current ) ) {
3382                         # Something wrong... no page?
3383                         return array( array( 'notanarticle' ) );
3384                 }
3385
3386                 $from = str_replace( '_', ' ', $fromP );
3387                 # User name given should match up with the top revision.
3388                 # If the user was deleted then $from should be empty.
3389                 if ( $from != $current->getUserText() ) {
3390                         $resultDetails = array( 'current' => $current );
3391                         return array( array( 'alreadyrolled',
3392                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3393                                 htmlspecialchars( $fromP ),
3394                                 htmlspecialchars( $current->getUserText() )
3395                         ) );
3396                 }
3397
3398                 # Get the last edit not by this guy...
3399                 # Note: these may not be public values
3400                 $user = intval( $current->getRawUser() );
3401                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3402                 $s = $dbw->selectRow( 'revision',
3403                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3404                         array( 'rev_page' => $current->getPage(),
3405                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3406                         ), __METHOD__,
3407                         array( 'USE INDEX' => 'page_timestamp',
3408                                 'ORDER BY' => 'rev_timestamp DESC' )
3409                         );
3410                 if ( $s === false ) {
3411                         # No one else ever edited this page
3412                         return array( array( 'cantrollback' ) );
3413                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3414                         # Only admins can see this text
3415                         return array( array( 'notvisiblerev' ) );
3416                 }
3417
3418                 $set = array();
3419                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3420                         # Mark all reverted edits as bot
3421                         $set['rc_bot'] = 1;
3422                 }
3423
3424                 if ( $wgUseRCPatrol ) {
3425                         # Mark all reverted edits as patrolled
3426                         $set['rc_patrolled'] = 1;
3427                 }
3428
3429                 if ( count( $set ) ) {
3430                         $dbw->update( 'recentchanges', $set,
3431                                 array( /* WHERE */
3432                                         'rc_cur_id' => $current->getPage(),
3433                                         'rc_user_text' => $current->getUserText(),
3434                                         "rc_timestamp > '{$s->rev_timestamp}'",
3435                                 ), __METHOD__
3436                         );
3437                 }
3438
3439                 # Generate the edit summary if necessary
3440                 $target = Revision::newFromId( $s->rev_id );
3441                 if ( empty( $summary ) ) {
3442                         if ( $from == '' ) { // no public user name
3443                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3444                         } else {
3445                                 $summary = wfMsgForContent( 'revertpage' );
3446                         }
3447                 }
3448
3449                 # Allow the custom summary to use the same args as the default message
3450                 $args = array(
3451                         $target->getUserText(), $from, $s->rev_id,
3452                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3453                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3454                 );
3455                 $summary = wfMsgReplaceArgs( $summary, $args );
3456
3457                 # Save
3458                 $flags = EDIT_UPDATE;
3459
3460                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3461                         $flags |= EDIT_MINOR;
3462                 }
3463
3464                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) ) {
3465                         $flags |= EDIT_FORCE_BOT;
3466                 }
3467
3468                 # Actually store the edit
3469                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3470                 if ( !empty( $status->value['revision'] ) ) {
3471                         $revId = $status->value['revision']->getId();
3472                 } else {
3473                         $revId = false;
3474                 }
3475
3476                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3477
3478                 $resultDetails = array(
3479                         'summary' => $summary,
3480                         'current' => $current,
3481                         'target'  => $target,
3482                         'newid'   => $revId
3483                 );
3484
3485                 return array();
3486         }
3487
3488         /**
3489          * User interface for rollback operations
3490          */
3491         public function rollback() {
3492                 global $wgUser, $wgOut, $wgRequest;
3493
3494                 $details = null;
3495
3496                 $result = $this->doRollback(
3497                         $wgRequest->getVal( 'from' ),
3498                         $wgRequest->getText( 'summary' ),
3499                         $wgRequest->getVal( 'token' ),
3500                         $wgRequest->getBool( 'bot' ),
3501                         $details
3502                 );
3503
3504                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3505                         $wgOut->rateLimited();
3506                         return;
3507                 }
3508
3509                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3510                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3511                         $errArray = $result[0];
3512                         $errMsg = array_shift( $errArray );
3513                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3514
3515                         if ( isset( $details['current'] ) ) {
3516                                 $current = $details['current'];
3517
3518                                 if ( $current->getComment() != '' ) {
3519                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3520                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3521                                 }
3522                         }
3523
3524                         return;
3525                 }
3526
3527                 # Display permissions errors before read-only message -- there's no
3528                 # point in misleading the user into thinking the inability to rollback
3529                 # is only temporary.
3530                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3531                         # array_diff is completely broken for arrays of arrays, sigh.
3532                         # Remove any 'readonlytext' error manually.
3533                         $out = array();
3534                         foreach ( $result as $error ) {
3535                                 if ( $error != array( 'readonlytext' ) ) {
3536                                         $out [] = $error;
3537                                 }
3538                         }
3539                         $wgOut->showPermissionsErrorPage( $out );
3540
3541                         return;
3542                 }
3543
3544                 if ( $result == array( array( 'readonlytext' ) ) ) {
3545                         $wgOut->readOnlyPage();
3546
3547                         return;
3548                 }
3549
3550                 $current = $details['current'];
3551                 $target = $details['target'];
3552                 $newId = $details['newid'];
3553                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3554                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3555
3556                 if ( $current->getUserText() === '' ) {
3557                         $old = wfMsg( 'rev-deleted-user' );
3558                 } else {
3559                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3560                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3561                 }
3562
3563                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3564                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3565                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3566                 $wgOut->returnToMain( false, $this->mTitle );
3567
3568                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3569                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3570                         $de->showDiff( '', '' );
3571                 }
3572         }
3573
3574         /**
3575          * Do standard deferred updates after page view
3576          */
3577         public function viewUpdates() {
3578                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3579                 if ( wfReadOnly() ) {
3580                         return;
3581                 }
3582
3583                 # Don't update page view counters on views from bot users (bug 14044)
3584                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3585                         Article::incViewCount( $this->getID() );
3586                         $u = new SiteStatsUpdate( 1, 0, 0 );
3587                         array_push( $wgDeferredUpdateList, $u );
3588                 }
3589
3590                 # Update newtalk / watchlist notification status
3591                 $wgUser->clearNotification( $this->mTitle );
3592         }
3593
3594         /**
3595          * Prepare text which is about to be saved.
3596          * Returns a stdclass with source, pst and output members
3597          */
3598         public function prepareTextForEdit( $text, $revid = null ) {
3599                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3600                         // Already prepared
3601                         return $this->mPreparedEdit;
3602                 }
3603
3604                 global $wgParser;
3605
3606                 $edit = (object)array();
3607                 $edit->revid = $revid;
3608                 $edit->newText = $text;
3609                 $edit->pst = $this->preSaveTransform( $text );
3610                 $edit->popts = clone $this->getParserOptions();
3611                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3612                 $edit->oldText = $this->getContent();
3613
3614                 $this->mPreparedEdit = $edit;
3615
3616                 return $edit;
3617         }
3618
3619         /**
3620          * Do standard deferred updates after page edit.
3621          * Update links tables, site stats, search index and message cache.
3622          * Purges pages that include this page if the text was changed here.
3623          * Every 100th edit, prune the recent changes table.
3624          *
3625          * @private
3626          * @param $text New text of the article
3627          * @param $summary Edit summary
3628          * @param $minoredit Minor edit
3629          * @param $timestamp_of_pagechange Timestamp associated with the page change
3630          * @param $newid rev_id value of the new revision
3631          * @param $changed Whether or not the content actually changed
3632          */
3633         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3634                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3635
3636                 wfProfileIn( __METHOD__ );
3637
3638                 # Parse the text
3639                 # Be careful not to double-PST: $text is usually already PST-ed once
3640                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3641                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3642                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3643                 } else {
3644                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3645                         $editInfo = $this->mPreparedEdit;
3646                 }
3647
3648                 # Save it to the parser cache
3649                 if ( $wgEnableParserCache ) {
3650                         $parserCache = ParserCache::singleton();
3651                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3652                 }
3653
3654                 # Update the links tables
3655                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3656                 $u->doUpdate();
3657
3658                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3659
3660                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3661                         if ( 0 == mt_rand( 0, 99 ) ) {
3662                                 // Flush old entries from the `recentchanges` table; we do this on
3663                                 // random requests so as to avoid an increase in writes for no good reason
3664                                 global $wgRCMaxAge;
3665
3666                                 $dbw = wfGetDB( DB_MASTER );
3667                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3668                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3669                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3670
3671                                 $dbw->query( $sql );
3672                         }
3673                 }
3674
3675                 $id = $this->getID();
3676                 $title = $this->mTitle->getPrefixedDBkey();
3677                 $shortTitle = $this->mTitle->getDBkey();
3678
3679                 if ( 0 == $id ) {
3680                         wfProfileOut( __METHOD__ );
3681                         return;
3682                 }
3683
3684                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3685                 array_push( $wgDeferredUpdateList, $u );
3686                 $u = new SearchUpdate( $id, $title, $text );
3687                 array_push( $wgDeferredUpdateList, $u );
3688
3689                 # If this is another user's talk page, update newtalk
3690                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3691                 # load of user talk pages and piss people off, nor if it's a minor edit
3692                 # by a properly-flagged bot.
3693                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3694                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3695                 ) {
3696                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3697                                 $other = User::newFromName( $shortTitle, false );
3698                                 if ( !$other ) {
3699                                         wfDebug( __METHOD__ . ": invalid username\n" );
3700                                 } elseif ( User::isIP( $shortTitle ) ) {
3701                                         // An anonymous user
3702                                         $other->setNewtalk( true );
3703                                 } elseif ( $other->isLoggedIn() ) {
3704                                         $other->setNewtalk( true );
3705                                 } else {
3706                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3707                                 }
3708                         }
3709                 }
3710
3711                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3712                         $wgMessageCache->replace( $shortTitle, $text );
3713                 }
3714
3715                 wfProfileOut( __METHOD__ );
3716         }
3717
3718         /**
3719          * Perform article updates on a special page creation.
3720          *
3721          * @param $rev Revision object
3722          *
3723          * @todo This is a shitty interface function. Kill it and replace the
3724          * other shitty functions like editUpdates and such so it's not needed
3725          * anymore.
3726          */
3727         public function createUpdates( $rev ) {
3728                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3729                 $this->mTotalAdjustment = 1;
3730                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3731                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3732         }
3733
3734         /**
3735          * Generate the navigation links when browsing through an article revisions
3736          * It shows the information as:
3737          *   Revision as of \<date\>; view current revision
3738          *   \<- Previous version | Next Version -\>
3739          *
3740          * @param $oldid String: revision ID of this article revision
3741          */
3742         public function setOldSubtitle( $oldid = 0 ) {
3743                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3744
3745                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3746                         return;
3747                 }
3748
3749                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3750
3751                 # Cascade unhide param in links for easy deletion browsing
3752                 $extraParams = array();
3753                 if ( $wgRequest->getVal( 'unhide' ) ) {
3754                         $extraParams['unhide'] = 1;
3755                 }
3756
3757                 $revision = Revision::newFromId( $oldid );
3758
3759                 $current = ( $oldid == $this->mLatest );
3760                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3761                 $tddate = $wgLang->date( $this->mTimestamp, true );
3762                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3763                 $sk = $wgUser->getSkin();
3764                 $lnk = $current
3765                         ? wfMsgHtml( 'currentrevisionlink' )
3766                         : $sk->link(
3767                                 $this->mTitle,
3768                                 wfMsgHtml( 'currentrevisionlink' ),
3769                                 array(),
3770                                 $extraParams,
3771                                 array( 'known', 'noclasses' )
3772                         );
3773                 $curdiff = $current
3774                         ? wfMsgHtml( 'diff' )
3775                         : $sk->link(
3776                                 $this->mTitle,
3777                                 wfMsgHtml( 'diff' ),
3778                                 array(),
3779                                 array(
3780                                         'diff' => 'cur',
3781                                         'oldid' => $oldid
3782                                 ) + $extraParams,
3783                                 array( 'known', 'noclasses' )
3784                         );
3785                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3786                 $prevlink = $prev
3787                         ? $sk->link(
3788                                 $this->mTitle,
3789                                 wfMsgHtml( 'previousrevision' ),
3790                                 array(),
3791                                 array(
3792                                         'direction' => 'prev',
3793                                         'oldid' => $oldid
3794                                 ) + $extraParams,
3795                                 array( 'known', 'noclasses' )
3796                         )
3797                         : wfMsgHtml( 'previousrevision' );
3798                 $prevdiff = $prev
3799                         ? $sk->link(
3800                                 $this->mTitle,
3801                                 wfMsgHtml( 'diff' ),
3802                                 array(),
3803                                 array(
3804                                         'diff' => 'prev',
3805                                         'oldid' => $oldid
3806                                 ) + $extraParams,
3807                                 array( 'known', 'noclasses' )
3808                         )
3809                         : wfMsgHtml( 'diff' );
3810                 $nextlink = $current
3811                         ? wfMsgHtml( 'nextrevision' )
3812                         : $sk->link(
3813                                 $this->mTitle,
3814                                 wfMsgHtml( 'nextrevision' ),
3815                                 array(),
3816                                 array(
3817                                         'direction' => 'next',
3818                                         'oldid' => $oldid
3819                                 ) + $extraParams,
3820                                 array( 'known', 'noclasses' )
3821                         );
3822                 $nextdiff = $current
3823                         ? wfMsgHtml( 'diff' )
3824                         : $sk->link(
3825                                 $this->mTitle,
3826                                 wfMsgHtml( 'diff' ),
3827                                 array(),
3828                                 array(
3829                                         'diff' => 'next',
3830                                         'oldid' => $oldid
3831                                 ) + $extraParams,
3832                                 array( 'known', 'noclasses' )
3833                         );
3834
3835                 $cdel = '';
3836
3837                 // User can delete revisions or view deleted revisions...
3838                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3839                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3840                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3841                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3842                         } else {
3843                                 $query = array(
3844                                         'type'   => 'revision',
3845                                         'target' => $this->mTitle->getPrefixedDbkey(),
3846                                         'ids'    => $oldid
3847                                 );
3848                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3849                         }
3850                         $cdel .= ' ';
3851                 }
3852
3853                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3854                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3855
3856                 $m = wfMsg( 'revision-info-current' );
3857                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3858                         ? 'revision-info-current'
3859                         : 'revision-info';
3860
3861                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3862                         wfMsgExt(
3863                                 $infomsg,
3864                                 array( 'parseinline', 'replaceafter' ),
3865                                 $td,
3866                                 $userlinks,
3867                                 $revision->getID(),
3868                                 $tddate,
3869                                 $tdtime,
3870                                 $revision->getUser()
3871                         ) .
3872                         "</div>\n" .
3873                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3874                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3875
3876                 $wgOut->setSubtitle( $r );
3877         }
3878
3879         /**
3880          * This function is called right before saving the wikitext,
3881          * so we can do things like signatures and links-in-context.
3882          *
3883          * @param $text String article contents
3884          * @return string article contents with altered wikitext markup (signatures
3885          *      converted, {{subst:}}, templates, etc.)
3886          */
3887         public function preSaveTransform( $text ) {
3888                 global $wgParser, $wgUser;
3889
3890                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3891         }
3892
3893         /* Caching functions */
3894
3895         /**
3896          * checkLastModified returns true if it has taken care of all
3897          * output to the client that is necessary for this request.
3898          * (that is, it has sent a cached version of the page)
3899          *
3900          * @return boolean true if cached version send, false otherwise
3901          */
3902         protected function tryFileCache() {
3903                 static $called = false;
3904
3905                 if ( $called ) {
3906                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3907                         return false;
3908                 }
3909
3910                 $called = true;
3911                 if ( $this->isFileCacheable() ) {
3912                         $cache = new HTMLFileCache( $this->mTitle );
3913                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3914                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3915                                 $cache->loadFromFileCache();
3916                                 return true;
3917                         } else {
3918                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3919                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3920                         }
3921                 } else {
3922                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3923                 }
3924
3925                 return false;
3926         }
3927
3928         /**
3929          * Check if the page can be cached
3930          * @return bool
3931          */
3932         public function isFileCacheable() {
3933                 $cacheable = false;
3934
3935                 if ( HTMLFileCache::useFileCache() ) {
3936                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3937                         // Extension may have reason to disable file caching on some pages.
3938                         if ( $cacheable ) {
3939                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3940                         }
3941                 }
3942
3943                 return $cacheable;
3944         }
3945
3946         /**
3947          * Loads page_touched and returns a value indicating if it should be used
3948          * @return boolean true if not a redirect
3949          */
3950         public function checkTouched() {
3951                 if ( !$this->mDataLoaded ) {
3952                         $this->loadPageData();
3953                 }
3954
3955                 return !$this->mIsRedirect;
3956         }
3957
3958         /**
3959          * Get the page_touched field
3960          * @return string containing GMT timestamp
3961          */
3962         public function getTouched() {
3963                 if ( !$this->mDataLoaded ) {
3964                         $this->loadPageData();
3965                 }
3966
3967                 return $this->mTouched;
3968         }
3969
3970         /**
3971          * Get the page_latest field
3972          * @return integer rev_id of current revision
3973          */
3974         public function getLatest() {
3975                 if ( !$this->mDataLoaded ) {
3976                         $this->loadPageData();
3977                 }
3978
3979                 return (int)$this->mLatest;
3980         }
3981
3982         /**
3983          * Edit an article without doing all that other stuff
3984          * The article must already exist; link tables etc
3985          * are not updated, caches are not flushed.
3986          *
3987          * @param $text String: text submitted
3988          * @param $comment String: comment submitted
3989          * @param $minor Boolean: whereas it's a minor modification
3990          */
3991         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3992                 wfProfileIn( __METHOD__ );
3993
3994                 $dbw = wfGetDB( DB_MASTER );
3995                 $revision = new Revision( array(
3996                         'page'       => $this->getId(),
3997                         'text'       => $text,
3998                         'comment'    => $comment,
3999                         'minor_edit' => $minor ? 1 : 0,
4000                         ) );
4001                 $revision->insertOn( $dbw );
4002                 $this->updateRevisionOn( $dbw, $revision );
4003
4004                 global $wgUser;
4005                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
4006
4007                 wfProfileOut( __METHOD__ );
4008         }
4009
4010         /**
4011          * Used to increment the view counter
4012          *
4013          * @param $id Integer: article id
4014          */
4015         public static function incViewCount( $id ) {
4016                 $id = intval( $id );
4017
4018                 global $wgHitcounterUpdateFreq;
4019
4020                 $dbw = wfGetDB( DB_MASTER );
4021                 $pageTable = $dbw->tableName( 'page' );
4022                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
4023                 $acchitsTable = $dbw->tableName( 'acchits' );
4024                 $dbType = $dbw->getType();
4025
4026                 if ( $wgHitcounterUpdateFreq <= 1 || $dbType == 'sqlite' ) {
4027                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
4028
4029                         return;
4030                 }
4031
4032                 # Not important enough to warrant an error page in case of failure
4033                 $oldignore = $dbw->ignoreErrors( true );
4034
4035                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
4036
4037                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
4038                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
4039                         # Most of the time (or on SQL errors), skip row count check
4040                         $dbw->ignoreErrors( $oldignore );
4041
4042                         return;
4043                 }
4044
4045                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
4046                 $row = $dbw->fetchObject( $res );
4047                 $rown = intval( $row->n );
4048
4049                 if ( $rown >= $wgHitcounterUpdateFreq ) {
4050                         wfProfileIn( 'Article::incViewCount-collect' );
4051                         $old_user_abort = ignore_user_abort( true );
4052
4053                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
4054                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
4055                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
4056                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
4057                                 'GROUP BY hc_id', __METHOD__ );
4058                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
4059                         $dbw->unlockTables( __METHOD__ );
4060
4061                         if ( $dbType == 'mysql' ) {
4062                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
4063                                         'WHERE page_id = hc_id', __METHOD__ );
4064                         } else {
4065                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
4066                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
4067                         }
4068                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
4069
4070                         ignore_user_abort( $old_user_abort );
4071                         wfProfileOut( 'Article::incViewCount-collect' );
4072                 }
4073
4074                 $dbw->ignoreErrors( $oldignore );
4075         }
4076
4077         /**#@+
4078          * The onArticle*() functions are supposed to be a kind of hooks
4079          * which should be called whenever any of the specified actions
4080          * are done.
4081          *
4082          * This is a good place to put code to clear caches, for instance.
4083          *
4084          * This is called on page move and undelete, as well as edit
4085          *
4086          * @param $title a title object
4087          */
4088         public static function onArticleCreate( $title ) {
4089                 # Update existence markers on article/talk tabs...
4090                 if ( $title->isTalkPage() ) {
4091                         $other = $title->getSubjectPage();
4092                 } else {
4093                         $other = $title->getTalkPage();
4094                 }
4095
4096                 $other->invalidateCache();
4097                 $other->purgeSquid();
4098
4099                 $title->touchLinks();
4100                 $title->purgeSquid();
4101                 $title->deleteTitleProtection();
4102         }
4103
4104         /**
4105          * Clears caches when article is deleted
4106          */
4107         public static function onArticleDelete( $title ) {
4108                 global $wgMessageCache;
4109
4110                 # Update existence markers on article/talk tabs...
4111                 if ( $title->isTalkPage() ) {
4112                         $other = $title->getSubjectPage();
4113                 } else {
4114                         $other = $title->getTalkPage();
4115                 }
4116
4117                 $other->invalidateCache();
4118                 $other->purgeSquid();
4119
4120                 $title->touchLinks();
4121                 $title->purgeSquid();
4122
4123                 # File cache
4124                 HTMLFileCache::clearFileCache( $title );
4125
4126                 # Messages
4127                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4128                         $wgMessageCache->replace( $title->getDBkey(), false );
4129                 }
4130
4131                 # Images
4132                 if ( $title->getNamespace() == NS_FILE ) {
4133                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4134                         $update->doUpdate();
4135                 }
4136
4137                 # User talk pages
4138                 if ( $title->getNamespace() == NS_USER_TALK ) {
4139                         $user = User::newFromName( $title->getText(), false );
4140                         $user->setNewtalk( false );
4141                 }
4142
4143                 # Image redirects
4144                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4145         }
4146
4147         /**
4148          * Purge caches on page update etc
4149          *
4150          * @param $title Title object
4151          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4152          */
4153         public static function onArticleEdit( $title ) {
4154                 global $wgDeferredUpdateList;
4155
4156                 // Invalidate caches of articles which include this page
4157                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4158
4159                 // Invalidate the caches of all pages which redirect here
4160                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4161
4162                 # Purge squid for this page only
4163                 $title->purgeSquid();
4164
4165                 # Clear file cache for this page only
4166                 HTMLFileCache::clearFileCache( $title );
4167         }
4168
4169         /**#@-*/
4170
4171         /**
4172          * Overriden by ImagePage class, only present here to avoid a fatal error
4173          * Called for ?action=revert
4174          */
4175         public function revert() {
4176                 global $wgOut;
4177                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4178         }
4179
4180         /**
4181          * Info about this page
4182          * Called for ?action=info when $wgAllowPageInfo is on.
4183          */
4184         public function info() {
4185                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4186
4187                 if ( !$wgAllowPageInfo ) {
4188                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4189                         return;
4190                 }
4191
4192                 $page = $this->mTitle->getSubjectPage();
4193
4194                 $wgOut->setPagetitle( $page->getPrefixedText() );
4195                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4196                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4197
4198                 if ( !$this->mTitle->exists() ) {
4199                         $wgOut->addHTML( '<div class="noarticletext">' );
4200                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4201                                 // This doesn't quite make sense; the user is asking for
4202                                 // information about the _page_, not the message... -- RC
4203                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
4204                         } else {
4205                                 $msg = $wgUser->isLoggedIn()
4206                                         ? 'noarticletext'
4207                                         : 'noarticletextanon';
4208                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4209                         }
4210
4211                         $wgOut->addHTML( '</div>' );
4212                 } else {
4213                         $dbr = wfGetDB( DB_SLAVE );
4214                         $wl_clause = array(
4215                                 'wl_title'     => $page->getDBkey(),
4216                                 'wl_namespace' => $page->getNamespace() );
4217                         $numwatchers = $dbr->selectField(
4218                                 'watchlist',
4219                                 'COUNT(*)',
4220                                 $wl_clause,
4221                                 __METHOD__,
4222                                 $this->getSelectOptions() );
4223
4224                         $pageInfo = $this->pageCountInfo( $page );
4225                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4226
4227
4228                         //FIXME: unescaped messages
4229                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4230                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4231
4232                         if ( $talkInfo ) {
4233                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4234                         }
4235
4236                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4237
4238                         if ( $talkInfo ) {
4239                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4240                         }
4241
4242                         $wgOut->addHTML( '</ul>' );
4243                 }
4244         }
4245
4246         /**
4247          * Return the total number of edits and number of unique editors
4248          * on a given page. If page does not exist, returns false.
4249          *
4250          * @param $title Title object
4251          * @return mixed array or boolean false
4252          */
4253         public function pageCountInfo( $title ) {
4254                 $id = $title->getArticleId();
4255
4256                 if ( $id == 0 ) {
4257                         return false;
4258                 }
4259
4260                 $dbr = wfGetDB( DB_SLAVE );
4261                 $rev_clause = array( 'rev_page' => $id );
4262                 $edits = $dbr->selectField(
4263                         'revision',
4264                         'COUNT(rev_page)',
4265                         $rev_clause,
4266                         __METHOD__,
4267                         $this->getSelectOptions()
4268                 );
4269                 $authors = $dbr->selectField(
4270                         'revision',
4271                         'COUNT(DISTINCT rev_user_text)',
4272                         $rev_clause,
4273                         __METHOD__,
4274                         $this->getSelectOptions()
4275                 );
4276
4277                 return array( 'edits' => $edits, 'authors' => $authors );
4278         }
4279
4280         /**
4281          * Return a list of templates used by this article.
4282          * Uses the templatelinks table
4283          *
4284          * @return Array of Title objects
4285          */
4286         public function getUsedTemplates() {
4287                 $result = array();
4288                 $id = $this->mTitle->getArticleID();
4289
4290                 if ( $id == 0 ) {
4291                         return array();
4292                 }
4293
4294                 $dbr = wfGetDB( DB_SLAVE );
4295                 $res = $dbr->select( array( 'templatelinks' ),
4296                         array( 'tl_namespace', 'tl_title' ),
4297                         array( 'tl_from' => $id ),
4298                         __METHOD__ );
4299
4300                 if ( $res !== false ) {
4301                         foreach ( $res as $row ) {
4302                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4303                         }
4304                 }
4305
4306                 return $result;
4307         }
4308
4309         /**
4310          * Returns a list of hidden categories this page is a member of.
4311          * Uses the page_props and categorylinks tables.
4312          *
4313          * @return Array of Title objects
4314          */
4315         public function getHiddenCategories() {
4316                 $result = array();
4317                 $id = $this->mTitle->getArticleID();
4318
4319                 if ( $id == 0 ) {
4320                         return array();
4321                 }
4322
4323                 $dbr = wfGetDB( DB_SLAVE );
4324                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4325                         array( 'cl_to' ),
4326                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4327                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4328                         __METHOD__ );
4329
4330                 if ( $res !== false ) {
4331                         foreach ( $res as $row ) {
4332                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4333                         }
4334                 }
4335
4336                 return $result;
4337         }
4338
4339         /**
4340         * Return an applicable autosummary if one exists for the given edit.
4341         * @param $oldtext String: the previous text of the page.
4342         * @param $newtext String: The submitted text of the page.
4343         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4344         * @return string An appropriate autosummary, or an empty string.
4345         */
4346         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4347                 global $wgContLang;
4348
4349                 # Decide what kind of autosummary is needed.
4350
4351                 # Redirect autosummaries
4352                 $ot = Title::newFromRedirect( $oldtext );
4353                 $rt = Title::newFromRedirect( $newtext );
4354
4355                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4356                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4357                 }
4358
4359                 # New page autosummaries
4360                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4361                         # If they're making a new article, give its text, truncated, in the summary.
4362
4363                         $truncatedtext = $wgContLang->truncate(
4364                                 str_replace( "\n", ' ', $newtext ),
4365                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4366
4367                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4368                 }
4369
4370                 # Blanking autosummaries
4371                 if ( $oldtext != '' && $newtext == '' ) {
4372                         return wfMsgForContent( 'autosumm-blank' );
4373                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4374                         # Removing more than 90% of the article
4375
4376                         $truncatedtext = $wgContLang->truncate(
4377                                 $newtext,
4378                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4379
4380                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4381                 }
4382
4383                 # If we reach this point, there's no applicable autosummary for our case, so our
4384                 # autosummary is empty.
4385                 return '';
4386         }
4387
4388         /**
4389          * Add the primary page-view wikitext to the output buffer
4390          * Saves the text into the parser cache if possible.
4391          * Updates templatelinks if it is out of date.
4392          *
4393          * @param $text String
4394          * @param $cache Boolean
4395          * @param $parserOptions mixed ParserOptions object, or boolean false
4396          */
4397         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4398                 global $wgOut;
4399
4400                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4401                 $wgOut->addParserOutput( $this->mParserOutput );
4402         }
4403
4404         /**
4405          * This does all the heavy lifting for outputWikitext, except it returns the parser
4406          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4407          * say, embedding thread pages within a discussion system (LiquidThreads)
4408          *
4409          * @param $text string
4410          * @param $cache boolean
4411          * @param $parserOptions parsing options, defaults to false
4412          * @return string containing parsed output
4413          */
4414         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4415                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4416
4417                 if ( !$parserOptions ) {
4418                         $parserOptions = clone $this->getParserOptions();
4419                 }
4420
4421                 $time = - wfTime();
4422                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4423                         $parserOptions, true, true, $this->getRevIdFetched() );
4424                 $time += wfTime();
4425
4426                 # Timing hack
4427                 if ( $time > 3 ) {
4428                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4429                                 $this->mTitle->getPrefixedDBkey() ) );
4430                 }
4431
4432                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4433                         $parserCache = ParserCache::singleton();
4434                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4435                 }
4436
4437                 // Make sure file cache is not used on uncacheable content.
4438                 // Output that has magic words in it can still use the parser cache
4439                 // (if enabled), though it will generally expire sooner.
4440                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4441                         $wgUseFileCache = false;
4442                 }
4443
4444                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4445
4446                 return $this->mParserOutput;
4447         }
4448
4449         /**
4450          * Get parser options suitable for rendering the primary article wikitext
4451          * @return mixed ParserOptions object or boolean false
4452          */
4453         public function getParserOptions() {
4454                 global $wgUser;
4455
4456                 if ( !$this->mParserOptions ) {
4457                         $this->mParserOptions = new ParserOptions( $wgUser );
4458                         $this->mParserOptions->setTidy( true );
4459                         $this->mParserOptions->enableLimitReport();
4460                 }
4461
4462                 // Clone to allow modifications of the return value without affecting
4463                 // the cache
4464                 return clone $this->mParserOptions;
4465         }
4466
4467         /**
4468          * Updates cascading protections
4469          *
4470          * @param $parserOutput mixed ParserOptions object, or boolean false
4471          **/
4472
4473         protected function doCascadeProtectionUpdates( $parserOutput ) {
4474                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4475                         return;
4476                 }
4477
4478                 // templatelinks table may have become out of sync,
4479                 // especially if using variable-based transclusions.
4480                 // For paranoia, check if things have changed and if
4481                 // so apply updates to the database. This will ensure
4482                 // that cascaded protections apply as soon as the changes
4483                 // are visible.
4484
4485                 # Get templates from templatelinks
4486                 $id = $this->mTitle->getArticleID();
4487
4488                 $tlTemplates = array();
4489
4490                 $dbr = wfGetDB( DB_SLAVE );
4491                 $res = $dbr->select( array( 'templatelinks' ),
4492                         array( 'tl_namespace', 'tl_title' ),
4493                         array( 'tl_from' => $id ),
4494                         __METHOD__
4495                 );
4496
4497                 foreach ( $res as $row ) {
4498                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4499                 }
4500
4501                 # Get templates from parser output.
4502                 $poTemplates = array();
4503                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4504                         foreach ( $templates as $dbk => $id ) {
4505                                 $poTemplates["$ns:$dbk"] = true;
4506                         }
4507                 }
4508
4509                 # Get the diff
4510                 # Note that we simulate array_diff_key in PHP <5.0.x
4511                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4512
4513                 if ( count( $templates_diff ) > 0 ) {
4514                         # Whee, link updates time.
4515                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4516                         $u->doUpdate();
4517                 }
4518         }
4519
4520         /**
4521          * Update all the appropriate counts in the category table, given that
4522          * we've added the categories $added and deleted the categories $deleted.
4523          *
4524          * @param $added array   The names of categories that were added
4525          * @param $deleted array The names of categories that were deleted
4526          */
4527         public function updateCategoryCounts( $added, $deleted ) {
4528                 $ns = $this->mTitle->getNamespace();
4529                 $dbw = wfGetDB( DB_MASTER );
4530
4531                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4532                 # exist, we might legitimately not create it, but it's simpler to just
4533                 # create it and then give it a negative value, since the value is bogus
4534                 # anyway.
4535                 #
4536                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4537                 $insertCats = array_merge( $added, $deleted );
4538                 if ( !$insertCats ) {
4539                         # Okay, nothing to do
4540                         return;
4541                 }
4542
4543                 $insertRows = array();
4544
4545                 foreach ( $insertCats as $cat ) {
4546                         $insertRows[] = array(
4547                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4548                                 'cat_title' => $cat
4549                         );
4550                 }
4551                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4552
4553                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4554                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4555
4556                 if ( $ns == NS_CATEGORY ) {
4557                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4558                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4559                 } elseif ( $ns == NS_FILE ) {
4560                         $addFields[]    = 'cat_files = cat_files + 1';
4561                         $removeFields[] = 'cat_files = cat_files - 1';
4562                 }
4563
4564                 if ( $added ) {
4565                         $dbw->update(
4566                                 'category',
4567                                 $addFields,
4568                                 array( 'cat_title' => $added ),
4569                                 __METHOD__
4570                         );
4571                 }
4572
4573                 if ( $deleted ) {
4574                         $dbw->update(
4575                                 'category',
4576                                 $removeFields,
4577                                 array( 'cat_title' => $deleted ),
4578                                 __METHOD__
4579                         );
4580                 }
4581         }
4582
4583         /**
4584          * Lightweight method to get the parser output for a page, checking the parser cache
4585          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4586          * consider, so it's not appropriate to use there.
4587          *
4588          * @since 1.16 (r52326) for LiquidThreads
4589          *
4590          * @param $oldid mixed integer Revision ID or null
4591          */
4592         public function getParserOutput( $oldid = null ) {
4593                 global $wgEnableParserCache, $wgUser;
4594
4595                 // Should the parser cache be used?
4596                 $useParserCache = $wgEnableParserCache &&
4597                         $wgUser->getStubThreshold() == 0 &&
4598                         $this->exists() &&
4599                         $oldid === null;
4600
4601                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4602
4603                 if ( $wgUser->getStubThreshold() ) {
4604                         wfIncrStats( 'pcache_miss_stub' );
4605                 }
4606
4607                 $parserOutput = false;
4608                 if ( $useParserCache ) {
4609                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4610                 }
4611
4612                 if ( $parserOutput === false ) {
4613                         // Cache miss; parse and output it.
4614                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4615
4616                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4617                 } else {
4618                         return $parserOutput;
4619                 }
4620         }
4621
4622         // Deprecated methods
4623         /**
4624          * Get the database which should be used for reads
4625          *
4626          * @return Database
4627          * @deprecated - just call wfGetDB( DB_MASTER ) instead
4628          */
4629         function getDB() {
4630                 wfDeprecated( __METHOD__ );
4631                 return wfGetDB( DB_MASTER );
4632         }
4633
4634 }