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  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         public function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61                 return $t == null ? null : new Article( $t );
  62         }
  63
  64         /**
  65          * Tell the page view functions that this view was redirected
  66          * from another page on the wiki.
  67          * @param $from Title object.
  68          */
  69         public function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * If this page is a redirect, get its target
  75          *
  76          * The target will be fetched from the redirect table if possible.
  77          * If this page doesn't have an entry there, call insertRedirect()
  78          * @return mixed Title object, or null if this page is not a redirect
  79          */
  80         public function getRedirectTarget() {
  81                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  82                         return null;
  83                 if( !is_null($this->mRedirectTarget) )
  84                         return $this->mRedirectTarget;
  85                 # Query the redirect table
  86                 $dbr = wfGetDB( DB_SLAVE );
  87                 $row = $dbr->selectRow( 'redirect',
  88                         array('rd_namespace', 'rd_title'),
  89                         array('rd_from' => $this->getID() ),
  90                         __METHOD__
  91                 );
  92                 if( $row ) {
  93                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  94                 }
  95                 # This page doesn't have an entry in the redirect table
  96                 return $this->mRedirectTarget = $this->insertRedirect();
  97         }
  98
  99         /**
 100          * Insert an entry for this page into the redirect table.
 101          *
 102          * Don't call this function directly unless you know what you're doing.
 103          * @return Title object
 104          */
 105         public function insertRedirect() {
 106                 $retval = Title::newFromRedirect( $this->getContent() );
 107                 if( !$retval ) {
 108                         return null;
 109                 }
 110                 $dbw = wfGetDB( DB_MASTER );
 111                 $dbw->replace( 'redirect', array('rd_from'),
 112                         array(
 113                                 'rd_from' => $this->getID(),
 114                                 'rd_namespace' => $retval->getNamespace(),
 115                                 'rd_title' => $retval->getDBKey()
 116                         ),
 117                         __METHOD__
 118                 );
 119                 return $retval;
 120         }
 121
 122         /**
 123          * Get the Title object this page redirects to
 124          *
 125          * @return mixed false, Title of in-wiki target, or string with URL
 126          */
 127         public function followRedirect() {
 128                 $text = $this->getContent();
 129                 return $this->followRedirectText( $text );
 130         }
 131
 132         /**
 133          * Get the Title object this text redirects to
 134          *
 135          * @return mixed false, Title of in-wiki target, or string with URL
 136          */
 137         public function followRedirectText( $text ) {
 138                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 139                 # process if title object is valid and not special:userlogout
 140                 if( $rt ) {
 141                         if( $rt->getInterwiki() != '' ) {
 142                                 if( $rt->isLocal() ) {
 143                                         // Offsite wikis need an HTTP redirect.
 144                                         //
 145                                         // This can be hard to reverse and may produce loops,
 146                                         // so they may be disabled in the site configuration.
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 158                                                 // rolleyes
 159                                         } else {
 160                                                 return $rt->getFullURL();
 161                                         }
 162                                 }
 163                                 return $rt;
 164                         }
 165                 }
 166                 // No or invalid redirect
 167                 return false;
 168         }
 169
 170         /**
 171          * get the title object of the article
 172          */
 173         public function getTitle() {
 174                 return $this->mTitle;
 175         }
 176
 177         /**
 178          * Clear the object
 179          * @private
 180          */
 181         public function clear() {
 182                 $this->mDataLoaded    = false;
 183                 $this->mContentLoaded = false;
 184
 185                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRedirectTarget = null; # Title object if set
 188                 $this->mUserText =
 189                 $this->mTimestamp = $this->mComment = '';
 190                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 191                 $this->mTouched = '19700101000000';
 192                 $this->mForUpdate = false;
 193                 $this->mIsRedirect = false;
 194                 $this->mRevIdFetched = 0;
 195                 $this->mRedirectUrl = false;
 196                 $this->mLatest = false;
 197                 $this->mPreparedEdit = false;
 198         }
 199
 200         /**
 201          * Note that getContent/loadContent do not follow redirects anymore.
 202          * If you need to fetch redirectable content easily, try
 203          * the shortcut in Article::followContent()
 204          *
 205          * @return Return the text of this revision
 206         */
 207         public function getContent() {
 208                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 209                 wfProfileIn( __METHOD__ );
 210                 if( $this->getID() === 0 ) {
 211                         # If this is a MediaWiki:x message, then load the messages
 212                         # and return the message value for x.
 213                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 214                                 # If this is a system message, get the default text.
 215                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 216                                 $wgMessageCache->loadAllMessages( $lang );
 217                                 $text = wfMsgGetKey( $message, false, $lang, false );
 218                                 if( wfEmptyMsg( $message, $text ) )
 219                                         $text = '';
 220                         } else {
 221                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 222                         }
 223                         wfProfileOut( __METHOD__ );
 224                         return $text;
 225                 } else {
 226                         $this->loadContent();
 227                         wfProfileOut( __METHOD__ );
 228                         return $this->mContent;
 229                 }
 230         }
 231
 232         /**
 233          * Get the text of the current revision. No side-effects...
 234          *
 235          * @return Return the text of the current revision
 236         */
 237         public function getRawText() {
 238                 // Check process cache for current revision
 239                 if( $this->mContentLoaded && $this->mOldId == 0 ) {
 240                         return $this->mContent;
 241                 }
 242                 $rev = Revision::newFromTitle( $this->mTitle );
 243                 $text = $rev ? $rev->getRawText() : false;
 244                 return $text;
 245         }
 246
 247         /**
 248          * This function returns the text of a section, specified by a number ($section).
 249          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 250          * the first section before any such heading (section 0).
 251          *
 252          * If a section contains subsections, these are also returned.
 253          *
 254          * @param $text String: text to look in
 255          * @param $section Integer: section number
 256          * @return string text of the requested section
 257          * @deprecated
 258          */
 259         public function getSection( $text, $section ) {
 260                 global $wgParser;
 261                 return $wgParser->getSection( $text, $section );
 262         }
 263
 264         /**
 265          * Get the text that needs to be saved in order to undo all revisions
 266          * between $undo and $undoafter. Revisions must belong to the same page,
 267          * must exist and must not be deleted
 268          * @param $undo Revision
 269          * @param $undoafter Revision Must be an earlier revision than $undo
 270          * @return mixed string on success, false on failure
 271          */
 272         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 273                 $undo_text = $undo->getText();
 274                 $undoafter_text = $undoafter->getText();
 275                 $cur_text = $this->getContent();
 276                 if ( $cur_text == $undo_text ) {
 277                         # No use doing a merge if it's just a straight revert.
 278                         return $undoafter_text;
 279                 }
 280                 $undone_text = '';
 281                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 282                         return false;
 283                 return $undone_text;
 284         }
 285
 286         /**
 287          * @return int The oldid of the article that is to be shown, 0 for the
 288          *             current revision
 289          */
 290         public function getOldID() {
 291                 if( is_null( $this->mOldId ) ) {
 292                         $this->mOldId = $this->getOldIDFromRequest();
 293                 }
 294                 return $this->mOldId;
 295         }
 296
 297         /**
 298          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 299          *
 300          * @return int The old id for the request
 301          */
 302         public function getOldIDFromRequest() {
 303                 global $wgRequest;
 304                 $this->mRedirectUrl = false;
 305                 $oldid = $wgRequest->getVal( 'oldid' );
 306                 if( isset( $oldid ) ) {
 307                         $oldid = intval( $oldid );
 308                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 309                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 310                                 if( $nextid  ) {
 311                                         $oldid = $nextid;
 312                                 } else {
 313                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 314                                 }
 315                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 316                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 317                                 if( $previd ) {
 318                                         $oldid = $previd;
 319                                 }
 320                         }
 321                 }
 322                 if( !$oldid ) {
 323                         $oldid = 0;
 324                 }
 325                 return $oldid;
 326         }
 327
 328         /**
 329          * Load the revision (including text) into this object
 330          */
 331         function loadContent() {
 332                 if( $this->mContentLoaded ) return;
 333                 wfProfileIn( __METHOD__ );
 334                 # Query variables :P
 335                 $oldid = $this->getOldID();
 336                 # Pre-fill content with error message so that if something
 337                 # fails we'll have something telling us what we intended.
 338                 $this->mOldId = $oldid;
 339                 $this->fetchContent( $oldid );
 340                 wfProfileOut( __METHOD__ );
 341         }
 342
 343
 344         /**
 345          * Fetch a page record with the given conditions
 346          * @param $dbr Database object
 347          * @param $conditions Array
 348          */
 349         protected function pageData( $dbr, $conditions ) {
 350                 $fields = array(
 351                                 'page_id',
 352                                 'page_namespace',
 353                                 'page_title',
 354                                 'page_restrictions',
 355                                 'page_counter',
 356                                 'page_is_redirect',
 357                                 'page_is_new',
 358                                 'page_random',
 359                                 'page_touched',
 360                                 'page_latest',
 361                                 'page_len',
 362                 );
 363                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 364                 $row = $dbr->selectRow(
 365                         'page',
 366                         $fields,
 367                         $conditions,
 368                         __METHOD__
 369                 );
 370                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 371                 return $row ;
 372         }
 373
 374         /**
 375          * @param $dbr Database object
 376          * @param $title Title object
 377          */
 378         public function pageDataFromTitle( $dbr, $title ) {
 379                 return $this->pageData( $dbr, array(
 380                         'page_namespace' => $title->getNamespace(),
 381                         'page_title'     => $title->getDBkey() ) );
 382         }
 383
 384         /**
 385          * @param $dbr Database
 386          * @param $id Integer
 387          */
 388         protected function pageDataFromId( $dbr, $id ) {
 389                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 390         }
 391
 392         /**
 393          * Set the general counter, title etc data loaded from
 394          * some source.
 395          *
 396          * @param $data Database row object or "fromdb"
 397          */
 398         public function loadPageData( $data = 'fromdb' ) {
 399                 if( $data === 'fromdb' ) {
 400                         $dbr = wfGetDB( DB_MASTER );
 401                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 402                 }
 403
 404                 $lc = LinkCache::singleton();
 405                 if( $data ) {
 406                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 407
 408                         $this->mTitle->mArticleID = $data->page_id;
 409
 410                         # Old-fashioned restrictions
 411                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 412
 413                         $this->mCounter     = $data->page_counter;
 414                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mIsRedirect  = $data->page_is_redirect;
 416                         $this->mLatest      = $data->page_latest;
 417                 } else {
 418                         if( is_object( $this->mTitle ) ) {
 419                                 $lc->addBadLinkObj( $this->mTitle );
 420                         }
 421                         $this->mTitle->mArticleID = 0;
 422                 }
 423
 424                 $this->mDataLoaded  = true;
 425         }
 426
 427         /**
 428          * Get text of an article from database
 429          * Does *NOT* follow redirects.
 430          * @param $oldid Int: 0 for whatever the latest revision is
 431          * @return string
 432          */
 433         function fetchContent( $oldid = 0 ) {
 434                 if( $this->mContentLoaded ) {
 435                         return $this->mContent;
 436                 }
 437
 438                 $dbr = wfGetDB( DB_MASTER );
 439
 440                 # Pre-fill content with error message so that if something
 441                 # fails we'll have something telling us what we intended.
 442                 $t = $this->mTitle->getPrefixedText();
 443                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 444                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 445
 446                 if( $oldid ) {
 447                         $revision = Revision::newFromId( $oldid );
 448                         if( is_null( $revision ) ) {
 449                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 450                                 return false;
 451                         }
 452                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 453                         if( !$data ) {
 454                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 455                                 return false;
 456                         }
 457                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 458                         $this->loadPageData( $data );
 459                 } else {
 460                         if( !$this->mDataLoaded ) {
 461                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 462                                 if( !$data ) {
 463                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 464                                         return false;
 465                                 }
 466                                 $this->loadPageData( $data );
 467                         }
 468                         $revision = Revision::newFromId( $this->mLatest );
 469                         if( is_null( $revision ) ) {
 470                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 471                                 return false;
 472                         }
 473                 }
 474
 475                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 476                 // We should instead work with the Revision object when we need it...
 477                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 478
 479                 $this->mUser      = $revision->getUser();
 480                 $this->mUserText  = $revision->getUserText();
 481                 $this->mComment   = $revision->getComment();
 482                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 483
 484                 $this->mRevIdFetched = $revision->getId();
 485                 $this->mContentLoaded = true;
 486                 $this->mRevision =& $revision;
 487
 488                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 489
 490                 return $this->mContent;
 491         }
 492
 493         /**
 494          * Read/write accessor to select FOR UPDATE
 495          *
 496          * @param $x Mixed: FIXME
 497          */
 498         public function forUpdate( $x = NULL ) {
 499                 return wfSetVar( $this->mForUpdate, $x );
 500         }
 501
 502         /**
 503          * Get the database which should be used for reads
 504          *
 505          * @return Database
 506          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 507          */
 508         function getDB() {
 509                 wfDeprecated( __METHOD__ );
 510                 return wfGetDB( DB_MASTER );
 511         }
 512
 513         /**
 514          * Get options for all SELECT statements
 515          *
 516          * @param $options Array: an optional options array which'll be appended to
 517          *                       the default
 518          * @return Array: options
 519          */
 520         protected function getSelectOptions( $options = '' ) {
 521                 if( $this->mForUpdate ) {
 522                         if( is_array( $options ) ) {
 523                                 $options[] = 'FOR UPDATE';
 524                         } else {
 525                                 $options = 'FOR UPDATE';
 526                         }
 527                 }
 528                 return $options;
 529         }
 530
 531         /**
 532          * @return int Page ID
 533          */
 534         public function getID() {
 535                 if( $this->mTitle ) {
 536                         return $this->mTitle->getArticleID();
 537                 } else {
 538                         return 0;
 539                 }
 540         }
 541
 542         /**
 543          * @return bool Whether or not the page exists in the database
 544          */
 545         public function exists() {
 546                 return $this->getId() > 0;
 547         }
 548
 549         /**
 550          * Check if this page is something we're going to be showing
 551          * some sort of sensible content for. If we return false, page
 552          * views (plain action=view) will return an HTTP 404 response,
 553          * so spiders and robots can know they're following a bad link.
 554          *
 555          * @return bool
 556          */
 557         public function hasViewableContent() {
 558                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 559         }
 560
 561         /**
 562          * @return int The view count for the page
 563          */
 564         public function getCount() {
 565                 if( -1 == $this->mCounter ) {
 566                         $id = $this->getID();
 567                         if( $id == 0 ) {
 568                                 $this->mCounter = 0;
 569                         } else {
 570                                 $dbr = wfGetDB( DB_SLAVE );
 571                                 $this->mCounter = $dbr->selectField( 'page',
 572                                         'page_counter',
 573                                         array( 'page_id' => $id ),
 574                                         __METHOD__,
 575                                         $this->getSelectOptions()
 576                                 );
 577                         }
 578                 }
 579                 return $this->mCounter;
 580         }
 581
 582         /**
 583          * Determine whether a page  would be suitable for being counted as an
 584          * article in the site_stats table based on the title & its content
 585          *
 586          * @param $text String: text to analyze
 587          * @return bool
 588          */
 589         public function isCountable( $text ) {
 590                 global $wgUseCommaCount;
 591
 592                 $token = $wgUseCommaCount ? ',' : '[[';
 593                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 594         }
 595
 596         /**
 597          * Tests if the article text represents a redirect
 598          *
 599          * @param $text String: FIXME
 600          * @return bool
 601          */
 602         public function isRedirect( $text = false ) {
 603                 if( $text === false ) {
 604                         if( $this->mDataLoaded ) {
 605                                 return $this->mIsRedirect;
 606                         }
 607                         // Apparently loadPageData was never called
 608                         $this->loadContent();
 609                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 610                 } else {
 611                         $titleObj = Title::newFromRedirect( $text );
 612                 }
 613                 return $titleObj !== NULL;
 614         }
 615
 616         /**
 617          * Returns true if the currently-referenced revision is the current edit
 618          * to this page (and it exists).
 619          * @return bool
 620          */
 621         public function isCurrent() {
 622                 # If no oldid, this is the current version.
 623                 if( $this->getOldID() == 0 ) {
 624                         return true;
 625                 }
 626                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 627         }
 628
 629         /**
 630          * Loads everything except the text
 631          * This isn't necessary for all uses, so it's only done if needed.
 632          */
 633         protected function loadLastEdit() {
 634                 if( -1 != $this->mUser )
 635                         return;
 636
 637                 # New or non-existent articles have no user information
 638                 $id = $this->getID();
 639                 if( 0 == $id ) return;
 640
 641                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 642                 if( !is_null( $this->mLastRevision ) ) {
 643                         $this->mUser      = $this->mLastRevision->getUser();
 644                         $this->mUserText  = $this->mLastRevision->getUserText();
 645                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 646                         $this->mComment   = $this->mLastRevision->getComment();
 647                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 648                         $this->mRevIdFetched = $this->mLastRevision->getId();
 649                 }
 650         }
 651
 652         public function getTimestamp() {
 653                 // Check if the field has been filled by ParserCache::get()
 654                 if( !$this->mTimestamp ) {
 655                         $this->loadLastEdit();
 656                 }
 657                 return wfTimestamp(TS_MW, $this->mTimestamp);
 658         }
 659
 660         public function getUser() {
 661                 $this->loadLastEdit();
 662                 return $this->mUser;
 663         }
 664
 665         public function getUserText() {
 666                 $this->loadLastEdit();
 667                 return $this->mUserText;
 668         }
 669
 670         public function getComment() {
 671                 $this->loadLastEdit();
 672                 return $this->mComment;
 673         }
 674
 675         public function getMinorEdit() {
 676                 $this->loadLastEdit();
 677                 return $this->mMinorEdit;
 678         }
 679
 680         /* Use this to fetch the rev ID used on page views */
 681         public function getRevIdFetched() {
 682                 $this->loadLastEdit();
 683                 return $this->mRevIdFetched;
 684         }
 685
 686         /**
 687          * @param $limit Integer: default 0.
 688          * @param $offset Integer: default 0.
 689          */
 690         public function getContributors($limit = 0, $offset = 0) {
 691                 # XXX: this is expensive; cache this info somewhere.
 692
 693                 $contribs = array();
 694                 $dbr = wfGetDB( DB_SLAVE );
 695                 $revTable = $dbr->tableName( 'revision' );
 696                 $userTable = $dbr->tableName( 'user' );
 697                 $user = $this->getUser();
 698                 $pageId = $this->getId();
 699
 700                 $hideBit = Revision::DELETED_USER; // username hidden?
 701
 702                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 703                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 704                         WHERE rev_page = $pageId
 705                         AND rev_user != $user
 706                         AND rev_deleted & $hideBit = 0
 707                         GROUP BY rev_user, rev_user_text, user_real_name
 708                         ORDER BY timestamp DESC";
 709
 710                 if($limit > 0) { $sql .= ' LIMIT '.$limit; }
 711                 if($offset > 0) { $sql .= ' OFFSET '.$offset; }
 712
 713                 $sql .= ' '. $this->getSelectOptions();
 714
 715                 $res = $dbr->query($sql, __METHOD__ );
 716
 717                 return new UserArrayFromResult( $res );
 718         }
 719
 720         /**
 721          * This is the default action of the script: just view the page of
 722          * the given title.
 723         */
 724         public function view() {
 725                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 726                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 727                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 728                 global $wgDefaultRobotPolicy;
 729
 730                 # Let the parser know if this is the printable version
 731                 if( $wgOut->isPrintable() ) {
 732                         $wgOut->parserOptions()->setIsPrintable( true );
 733                 }
 734
 735                 wfProfileIn( __METHOD__ );
 736
 737                 # Get variables from query string
 738                 $oldid = $this->getOldID();
 739
 740                 # Try client and file cache
 741                 if( $oldid === 0 && $this->checkTouched() ) {
 742                         global $wgUseETag;
 743                         if( $wgUseETag ) {
 744                                 $parserCache = ParserCache::singleton();
 745                                 $wgOut->setETag( $parserCache->getETag($this, $wgOut->parserOptions()) );
 746                         }
 747                         # Is is client cached?
 748                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 749                                 wfProfileOut( __METHOD__ );
 750                                 return;
 751                         # Try file cache
 752                         } else if( $this->tryFileCache() ) {
 753                                 # tell wgOut that output is taken care of
 754                                 $wgOut->disable();
 755                                 $this->viewUpdates();
 756                                 wfProfileOut( __METHOD__ );
 757                                 return;
 758                         }
 759                 }
 760
 761                 $ns = $this->mTitle->getNamespace(); # shortcut
 762                 $sk = $wgUser->getSkin();
 763
 764                 # getOldID may want us to redirect somewhere else
 765                 if( $this->mRedirectUrl ) {
 766                         $wgOut->redirect( $this->mRedirectUrl );
 767                         wfProfileOut( __METHOD__ );
 768                         return;
 769                 }
 770
 771                 $diff = $wgRequest->getVal( 'diff' );
 772                 $rcid = $wgRequest->getVal( 'rcid' );
 773                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 774                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 775                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 776                 $return404 = false;
 777
 778                 $wgOut->setArticleFlag( true );
 779
 780                 # Discourage indexing of printable versions, but encourage following
 781                 if( $wgOut->isPrintable() ) {
 782                         $policy = 'noindex,follow';
 783                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 784                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 785                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 786                         # Honour customised robot policies for this namespace
 787                         $policy = $wgNamespaceRobotPolicies[$ns];
 788                 } else {
 789                         $policy = $wgDefaultRobotPolicy;
 790                 }
 791                 $wgOut->setRobotPolicy( $policy );
 792
 793                 # Allow admins to see deleted content if explicitly requested
 794                 $delId = $diff ? $diff : $oldid;
 795                 $unhide = $wgRequest->getInt('unhide') == 1
 796                         && $wgUser->matchEditToken( $wgRequest->getVal('token'), $delId );
 797                 # If we got diff and oldid in the query, we want to see a
 798                 # diff page instead of the article.
 799                 if( !is_null( $diff ) ) {
 800                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 801
 802                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 803                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 804                         // DifferenceEngine directly fetched the revision:
 805                         $this->mRevIdFetched = $de->mNewid;
 806                         $de->showDiffPage( $diffOnly );
 807
 808                         // Needed to get the page's current revision
 809                         $this->loadPageData();
 810                         if( $diff == 0 || $diff == $this->mLatest ) {
 811                                 # Run view updates for current revision only
 812                                 $this->viewUpdates();
 813                         }
 814                         wfProfileOut( __METHOD__ );
 815                         return;
 816                 }
 817
 818                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
 819                         # User/User_talk subpages are not modified. (bug 11443)
 820                         if( !$this->mTitle->isSubpage() ) {
 821                                 $block = new Block();
 822                                 if( $block->load( $this->mTitle->getBaseText() ) ) {
 823                                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 824                                 }
 825                         }
 826                 }
 827
 828                 # Should the parser cache be used?
 829                 $pcache = $this->useParserCache( $oldid );
 830                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 831                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 832                         wfIncrStats( 'pcache_miss_stub' );
 833                 }
 834
 835                 $wasRedirected = false;
 836                 if( isset( $this->mRedirectedFrom ) ) {
 837                         // This is an internally redirected page view.
 838                         // We'll need a backlink to the source page for navigation.
 839                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 840                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 841                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 842                                 $wgOut->setSubtitle( $s );
 843
 844                                 // Set the fragment if one was specified in the redirect
 845                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 846                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 847                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 848                                 }
 849
 850                                 // Add a <link rel="canonical"> tag
 851                                 $wgOut->addLink( array( 'rel' => 'canonical',
 852                                         'href' => $this->mTitle->getLocalURL() )
 853                                 );
 854                                 $wasRedirected = true;
 855                         }
 856                 } elseif( !empty( $rdfrom ) ) {
 857                         // This is an externally redirected view, from some other wiki.
 858                         // If it was reported from a trusted site, supply a backlink.
 859                         global $wgRedirectSources;
 860                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 861                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 862                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 863                                 $wgOut->setSubtitle( $s );
 864                                 $wasRedirected = true;
 865                         }
 866                 }
 867
 868                 $outputDone = false;
 869                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 870                 if( $pcache && $wgOut->tryParserCache( $this ) ) {
 871                         // Ensure that UI elements requiring revision ID have
 872                         // the correct version information.
 873                         $wgOut->setRevisionId( $this->mLatest );
 874                         $outputDone = true;
 875                 }
 876                 # Fetch content and check for errors
 877                 if( !$outputDone ) {
 878                         # If the article does not exist and was deleted, show the log
 879                         if( $this->getID() == 0 ) {
 880                                 $this->showDeletionLog();
 881                         }
 882                         $text = $this->getContent();
 883                         // For now, check also for ID until getContent actually returns
 884                         // false for pages that do not exists
 885                         if( $text === false || $this->getID() === 0 ) {
 886                                 # Failed to load, replace text with error message
 887                                 $t = $this->mTitle->getPrefixedText();
 888                                 if( $oldid ) {
 889                                         $d = wfMsgExt( 'missingarticle-rev', 'escape', $oldid );
 890                                         $text = wfMsgExt( 'missing-article', 'parsemag', $t, $d );
 891                                 // Always use page content for pages in the MediaWiki namespace
 892                                 // since it contains the default message
 893                                 } elseif ( $this->mTitle->getNamespace() != NS_MEDIAWIKI ) {
 894                                         $text = wfMsgExt( 'noarticletext', 'parsemag' );
 895                                 }
 896                         }
 897
 898                         # Non-existent pages
 899                         if( $this->getID() === 0 ) {
 900                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 901                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 902                                 if( !$this->hasViewableContent() ) {
 903                                         // If there's no backing content, send a 404 Not Found
 904                                         // for better machine handling of broken links.
 905                                         $return404 = true;
 906                                 }
 907                         }
 908
 909                         if( $return404 ) {
 910                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 911                         }
 912
 913                         # Another whitelist check in case oldid is altering the title
 914                         if( !$this->mTitle->userCanRead() ) {
 915                                 $wgOut->loginToUse();
 916                                 $wgOut->output();
 917                                 $wgOut->disable();
 918                                 wfProfileOut( __METHOD__ );
 919                                 return;
 920                         }
 921
 922                         # For ?curid=x urls, disallow indexing
 923                         if( $wgRequest->getInt('curid') )
 924                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 925
 926                         # We're looking at an old revision
 927                         if( !empty( $oldid ) ) {
 928                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 929                                 if( is_null( $this->mRevision ) ) {
 930                                         // FIXME: This would be a nice place to load the 'no such page' text.
 931                                 } else {
 932                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 933                                         # Allow admins to see deleted content if explicitly requested
 934                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 935                                                 if( !$unhide || !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
 936                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-permission' );
 937                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 938                                                         wfProfileOut( __METHOD__ );
 939                                                         return;
 940                                                 } else {
 941                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-view' );
 942                                                         // and we are allowed to see...
 943                                                 }
 944                                         }
 945                                         // Is this the current revision and otherwise cacheable? Try the parser cache...
 946                                         if( $oldid === $this->getLatest() && $this->useParserCache( false )
 947                                                 && $wgOut->tryParserCache( $this ) )
 948                                         {
 949                                                 $outputDone = true;
 950                                         }
 951                                 }
 952                         }
 953
 954                         // Ensure that UI elements requiring revision ID have
 955                         // the correct version information.
 956                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 957
 958                         if( $outputDone ) {
 959                                 // do nothing...
 960                         // Pages containing custom CSS or JavaScript get special treatment
 961                         } else if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 962                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 963                                 // Give hooks a chance to customise the output
 964                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 965                                         // Wrap the whole lot in a <pre> and don't parse
 966                                         $m = array();
 967                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 968                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 969                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 970                                         $wgOut->addHTML( "\n</pre>\n" );
 971                                 }
 972                         } else if( $rt = Title::newFromRedirectArray( $text ) ) { # get an array of redirect targets
 973                                 # Don't append the subtitle if this was an old revision
 974                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 975                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 976                                 $wgOut->addParserOutputNoText( $parseout );
 977                         } else if( $pcache ) {
 978                                 # Display content and save to parser cache
 979                                 $this->outputWikiText( $text );
 980                         } else {
 981                                 # Display content, don't attempt to save to parser cache
 982                                 # Don't show section-edit links on old revisions... this way lies madness.
 983                                 if( !$this->isCurrent() ) {
 984                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 985                                 }
 986                                 # Display content and don't save to parser cache
 987                                 # With timing hack -- TS 2006-07-26
 988                                 $time = -wfTime();
 989                                 $this->outputWikiText( $text, false );
 990                                 $time += wfTime();
 991
 992                                 # Timing hack
 993                                 if( $time > 3 ) {
 994                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 995                                                 $this->mTitle->getPrefixedDBkey()));
 996                                 }
 997
 998                                 if( !$this->isCurrent() ) {
 999                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
1000                                 }
1001                         }
1002                 }
1003                 /* title may have been set from the cache */
1004                 $t = $wgOut->getPageTitle();
1005                 if( empty( $t ) ) {
1006                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1007
1008                         # For the main page, overwrite the <title> element with the con-
1009                         # tents of 'pagetitle-view-mainpage' instead of the default (if
1010                         # that's not empty).
1011                         if( $this->mTitle->equals( Title::newMainPage() ) &&
1012                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
1013                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
1014                         }
1015                 }
1016
1017                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1018                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1019                         $wgOut->addWikiMsg('anontalkpagetext');
1020                 }
1021
1022                 # If we have been passed an &rcid= parameter, we want to give the user a
1023                 # chance to mark this new article as patrolled.
1024                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->quickUserCan('patrol') ) {
1025                         $wgOut->addHTML(
1026                                 "<div class='patrollink'>" .
1027                                         wfMsgHtml( 'markaspatrolledlink',
1028                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
1029                                                 "action=markpatrolled&rcid=$rcid" )
1030                                         ) .
1031                                 '</div>'
1032                          );
1033                 }
1034
1035                 # Trackbacks
1036                 if( $wgUseTrackbacks ) {
1037                         $this->addTrackbacks();
1038                 }
1039
1040                 $this->viewUpdates();
1041                 wfProfileOut( __METHOD__ );
1042         }
1043
1044         protected function showDeletionLog() {
1045                 global $wgUser, $wgOut;
1046                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1047                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
1048                 if( $pager->getNumRows() > 0 ) {
1049                         $pager->mLimit = 10;
1050                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1051                         $wgOut->addWikiMsg( 'deleted-notice' );
1052                         $wgOut->addHTML(
1053                                 $loglist->beginLogEventsList() .
1054                                 $pager->getBody() .
1055                                 $loglist->endLogEventsList()
1056                         );
1057                         if( $pager->getNumRows() > 10 ) {
1058                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1059                                         SpecialPage::getTitleFor( 'Log' ),
1060                                         wfMsgHtml( 'deletelog-fulllog' ),
1061                                         array(),
1062                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
1063                                 ) );
1064                         }
1065                         $wgOut->addHTML( '</div>' );
1066                 }
1067         }
1068
1069         /*
1070         * Should the parser cache be used?
1071         */
1072         protected function useParserCache( $oldid ) {
1073                 global $wgUser, $wgEnableParserCache;
1074
1075                 return $wgEnableParserCache
1076                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1077                         && $this->exists()
1078                         && empty( $oldid )
1079                         && !$this->mTitle->isCssOrJsPage()
1080                         && !$this->mTitle->isCssJsSubpage();
1081         }
1082
1083         /**
1084          * View redirect
1085          * @param $target Title object or Array of destination(s) to redirect
1086          * @param $appendSubtitle Boolean [optional]
1087          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1088          */
1089         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1090                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1091                 # Display redirect
1092                 if( !is_array( $target ) ) {
1093                         $target = array( $target );
1094                 }
1095                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1096                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1097                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1098                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1099
1100                 if( $appendSubtitle ) {
1101                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1102                 }
1103                 $sk = $wgUser->getSkin();
1104                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1105                 $title = array_shift( $target );
1106                 if( $forceKnown ) {
1107                         $link = $sk->makeKnownLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1108                 } else {
1109                         $link = $sk->makeLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1110                 }
1111                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1112                 foreach( $target as $rt ) {
1113                         if( $forceKnown ) {
1114                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1115                                         . $sk->makeKnownLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1116                         } else {
1117                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1118                                         . $sk->makeLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1119                         }
1120                 }
1121                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1122                         '<span class="redirectText">'.$link.'</span>';
1123
1124         }
1125
1126         public function addTrackbacks() {
1127                 global $wgOut, $wgUser;
1128                 $dbr = wfGetDB( DB_SLAVE );
1129                 $tbs = $dbr->select( 'trackbacks',
1130                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1131                         array('tb_page' => $this->getID() )
1132                 );
1133                 if( !$dbr->numRows($tbs) ) return;
1134
1135                 $tbtext = "";
1136                 while( $o = $dbr->fetchObject($tbs) ) {
1137                         $rmvtxt = "";
1138                         if( $wgUser->isAllowed( 'trackback' ) ) {
1139                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1140                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1141                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1142                         }
1143                         $tbtext .= "\n";
1144                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1145                                         $o->tb_title,
1146                                         $o->tb_url,
1147                                         $o->tb_ex,
1148                                         $o->tb_name,
1149                                         $rmvtxt);
1150                 }
1151                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1152                 $this->mTitle->invalidateCache();
1153         }
1154
1155         public function deletetrackback() {
1156                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1157                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1158                         $wgOut->addWikiMsg( 'sessionfailure' );
1159                         return;
1160                 }
1161
1162                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1163                 if( count($permission_errors) ) {
1164                         $wgOut->showPermissionsErrorPage( $permission_errors );
1165                         return;
1166                 }
1167
1168                 $db = wfGetDB( DB_MASTER );
1169                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1170
1171                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1172                 $this->mTitle->invalidateCache();
1173         }
1174
1175         public function render() {
1176                 global $wgOut;
1177                 $wgOut->setArticleBodyOnly(true);
1178                 $this->view();
1179         }
1180
1181         /**
1182          * Handle action=purge
1183          */
1184         public function purge() {
1185                 global $wgUser, $wgRequest, $wgOut;
1186                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1187                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1188                                 $this->doPurge();
1189                                 $this->view();
1190                         }
1191                 } else {
1192                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1193                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1194                         $form = "<form method=\"post\" action=\"$action\">\n" .
1195                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1196                                         "</form>\n";
1197                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1198                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1199                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1200                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1201                         $wgOut->addHTML( $top . $form . $bottom );
1202                 }
1203         }
1204
1205         /**
1206          * Perform the actions of a page purging
1207          */
1208         public function doPurge() {
1209                 global $wgUseSquid;
1210                 // Invalidate the cache
1211                 $this->mTitle->invalidateCache();
1212
1213                 if( $wgUseSquid ) {
1214                         // Commit the transaction before the purge is sent
1215                         $dbw = wfGetDB( DB_MASTER );
1216                         $dbw->immediateCommit();
1217
1218                         // Send purge
1219                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1220                         $update->doUpdate();
1221                 }
1222                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1223                         global $wgMessageCache;
1224                         if( $this->getID() == 0 ) {
1225                                 $text = false;
1226                         } else {
1227                                 $text = $this->getRawText();
1228                         }
1229                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1230                 }
1231         }
1232
1233         /**
1234          * Insert a new empty page record for this article.
1235          * This *must* be followed up by creating a revision
1236          * and running $this->updateToLatest( $rev_id );
1237          * or else the record will be left in a funky state.
1238          * Best if all done inside a transaction.
1239          *
1240          * @param $dbw Database
1241          * @return int The newly created page_id key, or false if the title already existed
1242          * @private
1243          */
1244         public function insertOn( $dbw ) {
1245                 wfProfileIn( __METHOD__ );
1246
1247                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1248                 $dbw->insert( 'page', array(
1249                         'page_id'           => $page_id,
1250                         'page_namespace'    => $this->mTitle->getNamespace(),
1251                         'page_title'        => $this->mTitle->getDBkey(),
1252                         'page_counter'      => 0,
1253                         'page_restrictions' => '',
1254                         'page_is_redirect'  => 0, # Will set this shortly...
1255                         'page_is_new'       => 1,
1256                         'page_random'       => wfRandom(),
1257                         'page_touched'      => $dbw->timestamp(),
1258                         'page_latest'       => 0, # Fill this in shortly...
1259                         'page_len'          => 0, # Fill this in shortly...
1260                 ), __METHOD__, 'IGNORE' );
1261
1262                 $affected = $dbw->affectedRows();
1263                 if( $affected ) {
1264                         $newid = $dbw->insertId();
1265                         $this->mTitle->resetArticleId( $newid );
1266                 }
1267                 wfProfileOut( __METHOD__ );
1268                 return $affected ? $newid : false;
1269         }
1270
1271         /**
1272          * Update the page record to point to a newly saved revision.
1273          *
1274          * @param $dbw Database object
1275          * @param $revision Revision: For ID number, and text used to set
1276                             length and redirect status fields
1277          * @param $lastRevision Integer: if given, will not overwrite the page field
1278          *                      when different from the currently set value.
1279          *                      Giving 0 indicates the new page flag should be set
1280          *                      on.
1281          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1282          *                                                       removing rows in redirect table.
1283          * @return bool true on success, false on failure
1284          * @private
1285          */
1286         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1287                 wfProfileIn( __METHOD__ );
1288
1289                 $text = $revision->getText();
1290                 $rt = Title::newFromRedirect( $text );
1291
1292                 $conditions = array( 'page_id' => $this->getId() );
1293                 if( !is_null( $lastRevision ) ) {
1294                         # An extra check against threads stepping on each other
1295                         $conditions['page_latest'] = $lastRevision;
1296                 }
1297
1298                 $dbw->update( 'page',
1299                         array( /* SET */
1300                                 'page_latest'      => $revision->getId(),
1301                                 'page_touched'     => $dbw->timestamp(),
1302                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1303                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1304                                 'page_len'         => strlen( $text ),
1305                         ),
1306                         $conditions,
1307                         __METHOD__ );
1308
1309                 $result = $dbw->affectedRows() != 0;
1310                 if( $result ) {
1311                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1312                 }
1313
1314                 wfProfileOut( __METHOD__ );
1315                 return $result;
1316         }
1317
1318         /**
1319          * Add row to the redirect table if this is a redirect, remove otherwise.
1320          *
1321          * @param $dbw Database
1322          * @param $redirectTitle a title object pointing to the redirect target,
1323          *                                               or NULL if this is not a redirect
1324          * @param $lastRevIsRedirect If given, will optimize adding and
1325          *                                                       removing rows in redirect table.
1326          * @return bool true on success, false on failure
1327          * @private
1328          */
1329         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1330                 // Always update redirects (target link might have changed)
1331                 // Update/Insert if we don't know if the last revision was a redirect or not
1332                 // Delete if changing from redirect to non-redirect
1333                 $isRedirect = !is_null($redirectTitle);
1334                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1335                         wfProfileIn( __METHOD__ );
1336                         if( $isRedirect ) {
1337                                 // This title is a redirect, Add/Update row in the redirect table
1338                                 $set = array( /* SET */
1339                                         'rd_namespace' => $redirectTitle->getNamespace(),
1340                                         'rd_title'     => $redirectTitle->getDBkey(),
1341                                         'rd_from'      => $this->getId(),
1342                                 );
1343                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1344                         } else {
1345                                 // This is not a redirect, remove row from redirect table
1346                                 $where = array( 'rd_from' => $this->getId() );
1347                                 $dbw->delete( 'redirect', $where, __METHOD__);
1348                         }
1349                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1350                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1351                         }
1352                         wfProfileOut( __METHOD__ );
1353                         return ( $dbw->affectedRows() != 0 );
1354                 }
1355                 return true;
1356         }
1357
1358         /**
1359          * If the given revision is newer than the currently set page_latest,
1360          * update the page record. Otherwise, do nothing.
1361          *
1362          * @param $dbw Database object
1363          * @param $revision Revision object
1364          */
1365         public function updateIfNewerOn( &$dbw, $revision ) {
1366                 wfProfileIn( __METHOD__ );
1367                 $row = $dbw->selectRow(
1368                         array( 'revision', 'page' ),
1369                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1370                         array(
1371                                 'page_id' => $this->getId(),
1372                                 'page_latest=rev_id' ),
1373                         __METHOD__ );
1374                 if( $row ) {
1375                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1376                                 wfProfileOut( __METHOD__ );
1377                                 return false;
1378                         }
1379                         $prev = $row->rev_id;
1380                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1381                 } else {
1382                         # No or missing previous revision; mark the page as new
1383                         $prev = 0;
1384                         $lastRevIsRedirect = null;
1385                 }
1386                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1387                 wfProfileOut( __METHOD__ );
1388                 return $ret;
1389         }
1390
1391         /**
1392          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1393          * @return string Complete article text, or null if error
1394          */
1395         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1396                 wfProfileIn( __METHOD__ );
1397                 if( strval( $section ) == '' ) {
1398                         // Whole-page edit; let the whole text through
1399                 } else {
1400                         if( is_null($edittime) ) {
1401                                 $rev = Revision::newFromTitle( $this->mTitle );
1402                         } else {
1403                                 $dbw = wfGetDB( DB_MASTER );
1404                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1405                         }
1406                         if( !$rev ) {
1407                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1408                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1409                                 return null;
1410                         }
1411                         $oldtext = $rev->getText();
1412
1413                         if( $section == 'new' ) {
1414                                 # Inserting a new section
1415                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1416                                 $text = strlen( trim( $oldtext ) ) > 0
1417                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1418                                                 : "{$subject}{$text}";
1419                         } else {
1420                                 # Replacing an existing section; roll out the big guns
1421                                 global $wgParser;
1422                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1423                         }
1424                 }
1425                 wfProfileOut( __METHOD__ );
1426                 return $text;
1427         }
1428
1429         /**
1430          * @deprecated use Article::doEdit()
1431          */
1432         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1433                 wfDeprecated( __METHOD__ );
1434                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1435                         ( $isminor ? EDIT_MINOR : 0 ) |
1436                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1437                         ( $bot ? EDIT_FORCE_BOT : 0 );
1438
1439                 # If this is a comment, add the summary as headline
1440                 if( $comment && $summary != "" ) {
1441                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1442                 }
1443
1444                 $this->doEdit( $text, $summary, $flags );
1445
1446                 $dbw = wfGetDB( DB_MASTER );
1447                 if($watchthis) {
1448                         if(!$this->mTitle->userIsWatching()) {
1449                                 $dbw->begin();
1450                                 $this->doWatch();
1451                                 $dbw->commit();
1452                         }
1453                 } else {
1454                         if( $this->mTitle->userIsWatching() ) {
1455                                 $dbw->begin();
1456                                 $this->doUnwatch();
1457                                 $dbw->commit();
1458                         }
1459                 }
1460                 $this->doRedirect( $this->isRedirect( $text ) );
1461         }
1462
1463         /**
1464          * @deprecated use Article::doEdit()
1465          */
1466         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1467                 wfDeprecated( __METHOD__ );
1468                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1469                         ( $minor ? EDIT_MINOR : 0 ) |
1470                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1471
1472                 $status = $this->doEdit( $text, $summary, $flags );
1473                 if( !$status->isOK() ) {
1474                         return false;
1475                 }
1476
1477                 $dbw = wfGetDB( DB_MASTER );
1478                 if( $watchthis ) {
1479                         if(!$this->mTitle->userIsWatching()) {
1480                                 $dbw->begin();
1481                                 $this->doWatch();
1482                                 $dbw->commit();
1483                         }
1484                 } else {
1485                         if( $this->mTitle->userIsWatching() ) {
1486                                 $dbw->begin();
1487                                 $this->doUnwatch();
1488                                 $dbw->commit();
1489                         }
1490                 }
1491
1492                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1493                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1494
1495                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1496                 return true;
1497         }
1498
1499         /**
1500          * Article::doEdit()
1501          *
1502          * Change an existing article or create a new article. Updates RC and all necessary caches,
1503          * optionally via the deferred update array.
1504          *
1505          * $wgUser must be set before calling this function.
1506          *
1507          * @param $text String: new text
1508          * @param $summary String: edit summary
1509          * @param $flags Integer bitfield:
1510          *      EDIT_NEW
1511          *          Article is known or assumed to be non-existent, create a new one
1512          *      EDIT_UPDATE
1513          *          Article is known or assumed to be pre-existing, update it
1514          *      EDIT_MINOR
1515          *          Mark this edit minor, if the user is allowed to do so
1516          *      EDIT_SUPPRESS_RC
1517          *          Do not log the change in recentchanges
1518          *      EDIT_FORCE_BOT
1519          *          Mark the edit a "bot" edit regardless of user rights
1520          *      EDIT_DEFER_UPDATES
1521          *          Defer some of the updates until the end of index.php
1522          *      EDIT_AUTOSUMMARY
1523          *          Fill in blank summaries with generated text where possible
1524          *
1525          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1526          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1527          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1528          * edit-already-exists error will be returned. These two conditions are also possible with
1529          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1530          *
1531          * @param $baseRevId the revision ID this edit was based off, if any
1532          * @param $user Optional user object, $wgUser will be used if not passed
1533          *
1534          * @return Status object. Possible errors:
1535          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1536          *     edit-gone-missing:       In update mode, but the article didn't exist
1537          *     edit-conflict:           In update mode, the article changed unexpectedly
1538          *     edit-no-change:          Warning that the text was the same as before
1539          *     edit-already-exists:     In creation mode, but the article already exists
1540          *
1541          *  Extensions may define additional errors.
1542          *
1543          *  $return->value will contain an associative array with members as follows:
1544          *     new:                     Boolean indicating if the function attempted to create a new article
1545          *     revision:                The revision object for the inserted revision, or null
1546          *
1547          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1548          */
1549         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1550                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1551
1552                 # Low-level sanity check
1553                 if( $this->mTitle->getText() == '' ) {
1554                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1555                 }
1556
1557                 wfProfileIn( __METHOD__ );
1558
1559                 $user = is_null($user) ? $wgUser : $user;
1560                 $status = Status::newGood( array() );
1561
1562                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1563                 $this->loadPageData();
1564
1565                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1566                         $aid = $this->mTitle->getArticleID();
1567                         if( $aid ) {
1568                                 $flags |= EDIT_UPDATE;
1569                         } else {
1570                                 $flags |= EDIT_NEW;
1571                         }
1572                 }
1573
1574                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1575                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1576                 {
1577                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1578                         wfProfileOut( __METHOD__ );
1579                         if( $status->isOK() ) {
1580                                 $status->fatal( 'edit-hook-aborted');
1581                         }
1582                         return $status;
1583                 }
1584
1585                 # Silently ignore EDIT_MINOR if not allowed
1586                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1587                 $bot = $flags & EDIT_FORCE_BOT;
1588
1589                 $oldtext = $this->getRawText(); // current revision
1590                 $oldsize = strlen( $oldtext );
1591
1592                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1593                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1594                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1595                 }
1596
1597                 $editInfo = $this->prepareTextForEdit( $text );
1598                 $text = $editInfo->pst;
1599                 $newsize = strlen( $text );
1600
1601                 $dbw = wfGetDB( DB_MASTER );
1602                 $now = wfTimestampNow();
1603
1604                 if( $flags & EDIT_UPDATE ) {
1605                         # Update article, but only if changed.
1606                         $status->value['new'] = false;
1607                         # Make sure the revision is either completely inserted or not inserted at all
1608                         if( !$wgDBtransactions ) {
1609                                 $userAbort = ignore_user_abort( true );
1610                         }
1611
1612                         $revisionId = 0;
1613
1614                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1615
1616                         if( $changed ) {
1617                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1618                                   - (int)$this->isCountable( $oldtext );
1619                                 $this->mTotalAdjustment = 0;
1620
1621                                 if( !$this->mLatest ) {
1622                                         # Article gone missing
1623                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1624                                         $status->fatal( 'edit-gone-missing' );
1625                                         wfProfileOut( __METHOD__ );
1626                                         return $status;
1627                                 }
1628
1629                                 $revision = new Revision( array(
1630                                         'page'       => $this->getId(),
1631                                         'comment'    => $summary,
1632                                         'minor_edit' => $isminor,
1633                                         'text'       => $text,
1634                                         'parent_id'  => $this->mLatest,
1635                                         'user'       => $user->getId(),
1636                                         'user_text'  => $user->getName(),
1637                                         ) );
1638
1639                                 $dbw->begin();
1640                                 $revisionId = $revision->insertOn( $dbw );
1641
1642                                 # Update page
1643                                 #
1644                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1645                                 # during the course of this function. This makes sure that EditPage can detect
1646                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1647                                 # before this function is called. A previous function used a separate query, this
1648                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1649                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1650
1651                                 if( !$ok ) {
1652                                         /* Belated edit conflict! Run away!! */
1653                                         $status->fatal( 'edit-conflict' );
1654                                         # Delete the invalid revision if the DB is not transactional
1655                                         if( !$wgDBtransactions ) {
1656                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1657                                         }
1658                                         $revisionId = 0;
1659                                         $dbw->rollback();
1660                                 } else {
1661                                         global $wgUseRCPatrol;
1662                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1663                                         # Update recentchanges
1664                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1665                                                 # Mark as patrolled if the user can do so
1666                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1667                                                 # Add RC row to the DB
1668                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1669                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1670                                                         $revisionId, $patrolled
1671                                                 );
1672                                                 # Log auto-patrolled edits
1673                                                 if( $patrolled ) {
1674                                                         PatrolLog::record( $rc, true );
1675                                                 }
1676                                         }
1677                                         $user->incEditCount();
1678                                         $dbw->commit();
1679                                 }
1680                         } else {
1681                                 $status->warning( 'edit-no-change' );
1682                                 $revision = null;
1683                                 // Keep the same revision ID, but do some updates on it
1684                                 $revisionId = $this->getRevIdFetched();
1685                                 // Update page_touched, this is usually implicit in the page update
1686                                 // Other cache updates are done in onArticleEdit()
1687                                 $this->mTitle->invalidateCache();
1688                         }
1689
1690                         if( !$wgDBtransactions ) {
1691                                 ignore_user_abort( $userAbort );
1692                         }
1693                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1694                         if( !$status->isOK() ) {
1695                                 wfProfileOut( __METHOD__ );
1696                                 return $status;
1697                         }
1698
1699                         # Invalidate cache of this article and all pages using this article
1700                         # as a template. Partly deferred.
1701                         Article::onArticleEdit( $this->mTitle );
1702                         # Update links tables, site stats, etc.
1703                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1704                 } else {
1705                         # Create new article
1706                         $status->value['new'] = true;
1707
1708                         # Set statistics members
1709                         # We work out if it's countable after PST to avoid counter drift
1710                         # when articles are created with {{subst:}}
1711                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1712                         $this->mTotalAdjustment = 1;
1713
1714                         $dbw->begin();
1715
1716                         # Add the page record; stake our claim on this title!
1717                         # This will return false if the article already exists
1718                         $newid = $this->insertOn( $dbw );
1719
1720                         if( $newid === false ) {
1721                                 $dbw->rollback();
1722                                 $status->fatal( 'edit-already-exists' );
1723                                 wfProfileOut( __METHOD__ );
1724                                 return $status;
1725                         }
1726
1727                         # Save the revision text...
1728                         $revision = new Revision( array(
1729                                 'page'       => $newid,
1730                                 'comment'    => $summary,
1731                                 'minor_edit' => $isminor,
1732                                 'text'       => $text,
1733                                 'user'       => $user->getId(),
1734                                 'user_text'  => $user->getName(),
1735                                 ) );
1736                         $revisionId = $revision->insertOn( $dbw );
1737
1738                         $this->mTitle->resetArticleID( $newid );
1739
1740                         # Update the page record with revision data
1741                         $this->updateRevisionOn( $dbw, $revision, 0 );
1742
1743                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1744                         # Update recentchanges
1745                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1746                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1747                                 # Mark as patrolled if the user can do so
1748                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1749                                 # Add RC row to the DB
1750                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1751                                         '', strlen($text), $revisionId, $patrolled );
1752                                 # Log auto-patrolled edits
1753                                 if( $patrolled ) {
1754                                         PatrolLog::record( $rc, true );
1755                                 }
1756                         }
1757                         $user->incEditCount();
1758                         $dbw->commit();
1759
1760                         # Update links, etc.
1761                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1762
1763                         # Clear caches
1764                         Article::onArticleCreate( $this->mTitle );
1765
1766                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1767                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1768                 }
1769
1770                 # Do updates right now unless deferral was requested
1771                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1772                         wfDoUpdates();
1773                 }
1774
1775                 // Return the new revision (or null) to the caller
1776                 $status->value['revision'] = $revision;
1777
1778                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1779                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1780
1781                 wfProfileOut( __METHOD__ );
1782                 return $status;
1783         }
1784
1785         /**
1786          * @deprecated wrapper for doRedirect
1787          */
1788         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1789                 wfDeprecated( __METHOD__ );
1790                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1791         }
1792
1793         /**
1794          * Output a redirect back to the article.
1795          * This is typically used after an edit.
1796          *
1797          * @param $noRedir Boolean: add redirect=no
1798          * @param $sectionAnchor String: section to redirect to, including "#"
1799          * @param $extraQuery String: extra query params
1800          */
1801         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1802                 global $wgOut;
1803                 if( $noRedir ) {
1804                         $query = 'redirect=no';
1805                         if( $extraQuery )
1806                                 $query .= "&$query";
1807                 } else {
1808                         $query = $extraQuery;
1809                 }
1810                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1811         }
1812
1813         /**
1814          * Mark this particular edit/page as patrolled
1815          */
1816         public function markpatrolled() {
1817                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1818                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1819
1820                 # If we haven't been given an rc_id value, we can't do anything
1821                 $rcid = (int) $wgRequest->getVal('rcid');
1822                 $rc = RecentChange::newFromId($rcid);
1823                 if( is_null($rc) ) {
1824                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1825                         return;
1826                 }
1827
1828                 #It would be nice to see where the user had actually come from, but for now just guess
1829                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1830                 $return = SpecialPage::getTitleFor( $returnto );
1831
1832                 $dbw = wfGetDB( DB_MASTER );
1833                 $errors = $rc->doMarkPatrolled();
1834
1835                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1836                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1837                         return;
1838                 }
1839
1840                 if( in_array(array('hookaborted'), $errors) ) {
1841                         // The hook itself has handled any output
1842                         return;
1843                 }
1844
1845                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1846                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1847                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1848                         $wgOut->returnToMain( false, $return );
1849                         return;
1850                 }
1851
1852                 if( !empty($errors) ) {
1853                         $wgOut->showPermissionsErrorPage( $errors );
1854                         return;
1855                 }
1856
1857                 # Inform the user
1858                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1859                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1860                 $wgOut->returnToMain( false, $return );
1861         }
1862
1863         /**
1864          * User-interface handler for the "watch" action
1865          */
1866
1867         public function watch() {
1868                 global $wgUser, $wgOut;
1869                 if( $wgUser->isAnon() ) {
1870                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1871                         return;
1872                 }
1873                 if( wfReadOnly() ) {
1874                         $wgOut->readOnlyPage();
1875                         return;
1876                 }
1877                 if( $this->doWatch() ) {
1878                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1879                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1880                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1881                 }
1882                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1883         }
1884
1885         /**
1886          * Add this page to $wgUser's watchlist
1887          * @return bool true on successful watch operation
1888          */
1889         public function doWatch() {
1890                 global $wgUser;
1891                 if( $wgUser->isAnon() ) {
1892                         return false;
1893                 }
1894                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1895                         $wgUser->addWatch( $this->mTitle );
1896                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1897                 }
1898                 return false;
1899         }
1900
1901         /**
1902          * User interface handler for the "unwatch" action.
1903          */
1904         public function unwatch() {
1905                 global $wgUser, $wgOut;
1906                 if( $wgUser->isAnon() ) {
1907                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1908                         return;
1909                 }
1910                 if( wfReadOnly() ) {
1911                         $wgOut->readOnlyPage();
1912                         return;
1913                 }
1914                 if( $this->doUnwatch() ) {
1915                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1916                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1917                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1918                 }
1919                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1920         }
1921
1922         /**
1923          * Stop watching a page
1924          * @return bool true on successful unwatch
1925          */
1926         public function doUnwatch() {
1927                 global $wgUser;
1928                 if( $wgUser->isAnon() ) {
1929                         return false;
1930                 }
1931                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1932                         $wgUser->removeWatch( $this->mTitle );
1933                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1934                 }
1935                 return false;
1936         }
1937
1938         /**
1939          * action=protect handler
1940          */
1941         public function protect() {
1942                 $form = new ProtectionForm( $this );
1943                 $form->execute();
1944         }
1945
1946         /**
1947          * action=unprotect handler (alias)
1948          */
1949         public function unprotect() {
1950                 $this->protect();
1951         }
1952
1953         /**
1954          * Update the article's restriction field, and leave a log entry.
1955          *
1956          * @param $limit Array: set of restriction keys
1957          * @param $reason String
1958          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1959          * @param $expiry Array: per restriction type expiration
1960          * @return bool true on success
1961          */
1962         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1963                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1964
1965                 $id = $this->mTitle->getArticleID();
1966                 if ( $id <= 0 ) {
1967                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
1968                         return false;
1969                 }
1970
1971                 if ( wfReadOnly() ) {
1972                         wfDebug( "updateRestrictions failed: read-only\n" );
1973                         return false;
1974                 }
1975
1976                 if ( !$this->mTitle->userCan( 'protect' ) ) {
1977                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1978                         return false;
1979                 }
1980
1981                 if( !$cascade ) {
1982                         $cascade = false;
1983                 }
1984
1985                 // Take this opportunity to purge out expired restrictions
1986                 Title::purgeExpiredRestrictions();
1987
1988                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1989                 # we expect a single selection, but the schema allows otherwise.
1990                 $current = array();
1991                 $updated = Article::flattenRestrictions( $limit );
1992                 $changed = false;
1993                 foreach( $wgRestrictionTypes as $action ) {
1994                         if( isset( $expiry[$action] ) ) {
1995                                 # Get current restrictions on $action
1996                                 $aLimits = $this->mTitle->getRestrictions( $action );
1997                                 $current[$action] = implode( '', $aLimits );
1998                                 # Are any actual restrictions being dealt with here?
1999                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
2000                                 # If something changed, we need to log it. Checking $aRChanged
2001                                 # assures that "unprotecting" a page that is not protected does
2002                                 # not log just because the expiry was "changed".
2003                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2004                                         $changed = true;
2005                                 }
2006                         }
2007                 }
2008
2009                 $current = Article::flattenRestrictions( $current );
2010
2011                 $changed = ($changed || $current != $updated );
2012                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
2013                 $protect = ( $updated != '' );
2014
2015                 # If nothing's changed, do nothing
2016                 if( $changed ) {
2017                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2018
2019                                 $dbw = wfGetDB( DB_MASTER );
2020
2021                                 # Prepare a null revision to be added to the history
2022                                 $modified = $current != '' && $protect;
2023                                 if( $protect ) {
2024                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2025                                 } else {
2026                                         $comment_type = 'unprotectedarticle';
2027                                 }
2028                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2029
2030                                 # Only restrictions with the 'protect' right can cascade...
2031                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2032                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2033                                 # The schema allows multiple restrictions
2034                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2035                                         $cascade = false;
2036                                 $cascade_description = '';
2037                                 if( $cascade ) {
2038                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2039                                 }
2040
2041                                 if( $reason )
2042                                         $comment .= ": $reason";
2043
2044                                 $editComment = $comment;
2045                                 $encodedExpiry = array();
2046                                 $protect_description = '';
2047                                 foreach( $limit as $action => $restrictions  ) {
2048                                         if ( !isset($expiry[$action]) )
2049                                                 $expiry[$action] = 'infinite';
2050
2051                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2052                                         if( $restrictions != '' ) {
2053                                                 $protect_description .= "[$action=$restrictions] (";
2054                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2055                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2056                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2057                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2058                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2059                                                 } else {
2060                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2061                                                 }
2062                                                 $protect_description .= ') ';
2063                                         }
2064                                 }
2065                                 $protect_description = trim($protect_description);
2066
2067                                 if( $protect_description && $protect )
2068                                         $editComment .= " ($protect_description)";
2069                                 if( $cascade )
2070                                         $editComment .= "$cascade_description";
2071                                 # Update restrictions table
2072                                 foreach( $limit as $action => $restrictions ) {
2073                                         if($restrictions != '' ) {
2074                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2075                                                         array( 'pr_page' => $id,
2076                                                                 'pr_type' => $action,
2077                                                                 'pr_level' => $restrictions,
2078                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2079                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2080                                         } else {
2081                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2082                                                         'pr_type' => $action ), __METHOD__ );
2083                                         }
2084                                 }
2085
2086                                 # Insert a null revision
2087                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2088                                 $nullRevId = $nullRevision->insertOn( $dbw );
2089
2090                                 $latest = $this->getLatest();
2091                                 # Update page record
2092                                 $dbw->update( 'page',
2093                                         array( /* SET */
2094                                                 'page_touched' => $dbw->timestamp(),
2095                                                 'page_restrictions' => '',
2096                                                 'page_latest' => $nullRevId
2097                                         ), array( /* WHERE */
2098                                                 'page_id' => $id
2099                                         ), 'Article::protect'
2100                                 );
2101
2102                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2103                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2104
2105                                 # Update the protection log
2106                                 $log = new LogPage( 'protect' );
2107                                 if( $protect ) {
2108                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2109                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2110                                 } else {
2111                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2112                                 }
2113
2114                         } # End hook
2115                 } # End "changed" check
2116
2117                 return true;
2118         }
2119
2120         /**
2121          * Take an array of page restrictions and flatten it to a string
2122          * suitable for insertion into the page_restrictions field.
2123          * @param $limit Array
2124          * @return String
2125          */
2126         protected static function flattenRestrictions( $limit ) {
2127                 if( !is_array( $limit ) ) {
2128                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2129                 }
2130                 $bits = array();
2131                 ksort( $limit );
2132                 foreach( $limit as $action => $restrictions ) {
2133                         if( $restrictions != '' ) {
2134                                 $bits[] = "$action=$restrictions";
2135                         }
2136                 }
2137                 return implode( ':', $bits );
2138         }
2139
2140         /**
2141          * Auto-generates a deletion reason
2142          * @param &$hasHistory Boolean: whether the page has a history
2143          */
2144         public function generateReason( &$hasHistory ) {
2145                 global $wgContLang;
2146                 $dbw = wfGetDB( DB_MASTER );
2147                 // Get the last revision
2148                 $rev = Revision::newFromTitle( $this->mTitle );
2149                 if( is_null( $rev ) )
2150                         return false;
2151
2152                 // Get the article's contents
2153                 $contents = $rev->getText();
2154                 $blank = false;
2155                 // If the page is blank, use the text from the previous revision,
2156                 // which can only be blank if there's a move/import/protect dummy revision involved
2157                 if( $contents == '' ) {
2158                         $prev = $rev->getPrevious();
2159                         if( $prev )     {
2160                                 $contents = $prev->getText();
2161                                 $blank = true;
2162                         }
2163                 }
2164
2165                 // Find out if there was only one contributor
2166                 // Only scan the last 20 revisions
2167                 $limit = 20;
2168                 $res = $dbw->select( 'revision', 'rev_user_text',
2169                         array( 'rev_page' => $this->getID() ), __METHOD__,
2170                         array( 'LIMIT' => $limit )
2171                 );
2172                 if( $res === false )
2173                         // This page has no revisions, which is very weird
2174                         return false;
2175                 if( $res->numRows() > 1 )
2176                                 $hasHistory = true;
2177                 else
2178                                 $hasHistory = false;
2179                 $row = $dbw->fetchObject( $res );
2180                 $onlyAuthor = $row->rev_user_text;
2181                 // Try to find a second contributor
2182                 foreach( $res as $row ) {
2183                         if( $row->rev_user_text != $onlyAuthor ) {
2184                                 $onlyAuthor = false;
2185                                 break;
2186                         }
2187                 }
2188                 $dbw->freeResult( $res );
2189
2190                 // Generate the summary with a '$1' placeholder
2191                 if( $blank ) {
2192                         // The current revision is blank and the one before is also
2193                         // blank. It's just not our lucky day
2194                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2195                 } else {
2196                         if( $onlyAuthor )
2197                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2198                         else
2199                                 $reason = wfMsgForContent( 'excontent', '$1' );
2200                 }
2201
2202                 if( $reason == '-' ) {
2203                         // Allow these UI messages to be blanked out cleanly
2204                         return '';
2205                 }
2206
2207                 // Replace newlines with spaces to prevent uglyness
2208                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2209                 // Calculate the maximum amount of chars to get
2210                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2211                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2212                 $contents = $wgContLang->truncate( $contents, $maxLength );
2213                 // Remove possible unfinished links
2214                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2215                 // Now replace the '$1' placeholder
2216                 $reason = str_replace( '$1', $contents, $reason );
2217                 return $reason;
2218         }
2219
2220
2221         /*
2222          * UI entry point for page deletion
2223          */
2224         public function delete() {
2225                 global $wgUser, $wgOut, $wgRequest;
2226
2227                 $confirm = $wgRequest->wasPosted() &&
2228                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2229
2230                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2231                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2232
2233                 $reason = $this->DeleteReasonList;
2234
2235                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2236                         // Entry from drop down menu + additional comment
2237                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2238                 } elseif( $reason == 'other' ) {
2239                         $reason = $this->DeleteReason;
2240                 }
2241                 # Flag to hide all contents of the archived revisions
2242                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2243
2244                 # This code desperately needs to be totally rewritten
2245
2246                 # Read-only check...
2247                 if( wfReadOnly() ) {
2248                         $wgOut->readOnlyPage();
2249                         return;
2250                 }
2251
2252                 # Check permissions
2253                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2254
2255                 if( count( $permission_errors ) > 0 ) {
2256                         $wgOut->showPermissionsErrorPage( $permission_errors );
2257                         return;
2258                 }
2259
2260                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2261
2262                 # Better double-check that it hasn't been deleted yet!
2263                 $dbw = wfGetDB( DB_MASTER );
2264                 $conds = $this->mTitle->pageCond();
2265                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2266                 if( $latest === false ) {
2267                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2268                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2269                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2270                         return;
2271                 }
2272
2273                 # Hack for big sites
2274                 $bigHistory = $this->isBigDeletion();
2275                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2276                         global $wgLang, $wgDeleteRevisionsLimit;
2277                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2278                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2279                         return;
2280                 }
2281
2282                 if( $confirm ) {
2283                         $this->doDelete( $reason, $suppress );
2284                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2285                                 $this->doWatch();
2286                         } elseif( $this->mTitle->userIsWatching() ) {
2287                                 $this->doUnwatch();
2288                         }
2289                         return;
2290                 }
2291
2292                 // Generate deletion reason
2293                 $hasHistory = false;
2294                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2295
2296                 // If the page has a history, insert a warning
2297                 if( $hasHistory && !$confirm ) {
2298                         $skin = $wgUser->getSkin();
2299                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2300                         if( $bigHistory ) {
2301                                 global $wgLang, $wgDeleteRevisionsLimit;
2302                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2303                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2304                         }
2305                 }
2306
2307                 return $this->confirmDelete( $reason );
2308         }
2309
2310         /**
2311          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2312          */
2313         public function isBigDeletion() {
2314                 global $wgDeleteRevisionsLimit;
2315                 if( $wgDeleteRevisionsLimit ) {
2316                         $revCount = $this->estimateRevisionCount();
2317                         return $revCount > $wgDeleteRevisionsLimit;
2318                 }
2319                 return false;
2320         }
2321
2322         /**
2323          * @return int approximate revision count
2324          */
2325         public function estimateRevisionCount() {
2326                 $dbr = wfGetDB( DB_SLAVE );
2327                 // For an exact count...
2328                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2329                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2330                 return $dbr->estimateRowCount( 'revision', '*',
2331                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2332         }
2333
2334         /**
2335          * Get the last N authors
2336          * @param $num Integer: number of revisions to get
2337          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2338          * @return array Array of authors, duplicates not removed
2339          */
2340         public function getLastNAuthors( $num, $revLatest = 0 ) {
2341                 wfProfileIn( __METHOD__ );
2342                 // First try the slave
2343                 // If that doesn't have the latest revision, try the master
2344                 $continue = 2;
2345                 $db = wfGetDB( DB_SLAVE );
2346                 do {
2347                         $res = $db->select( array( 'page', 'revision' ),
2348                                 array( 'rev_id', 'rev_user_text' ),
2349                                 array(
2350                                         'page_namespace' => $this->mTitle->getNamespace(),
2351                                         'page_title' => $this->mTitle->getDBkey(),
2352                                         'rev_page = page_id'
2353                                 ), __METHOD__, $this->getSelectOptions( array(
2354                                         'ORDER BY' => 'rev_timestamp DESC',
2355                                         'LIMIT' => $num
2356                                 ) )
2357                         );
2358                         if( !$res ) {
2359                                 wfProfileOut( __METHOD__ );
2360                                 return array();
2361                         }
2362                         $row = $db->fetchObject( $res );
2363                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2364                                 $db = wfGetDB( DB_MASTER );
2365                                 $continue--;
2366                         } else {
2367                                 $continue = 0;
2368                         }
2369                 } while ( $continue );
2370
2371                 $authors = array( $row->rev_user_text );
2372                 while ( $row = $db->fetchObject( $res ) ) {
2373                         $authors[] = $row->rev_user_text;
2374                 }
2375                 wfProfileOut( __METHOD__ );
2376                 return $authors;
2377         }
2378
2379         /**
2380          * Output deletion confirmation dialog
2381          * @param $reason String: prefilled reason
2382          */
2383         public function confirmDelete( $reason ) {
2384                 global $wgOut, $wgUser;
2385
2386                 wfDebug( "Article::confirmDelete\n" );
2387
2388                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2389                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2390                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2391
2392                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2393                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2394                                         <td></td>
2395                                         <td class='mw-input'>" .
2396                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2397                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2398                                         "</td>
2399                                 </tr>";
2400                 } else {
2401                         $suppress = '';
2402                 }
2403                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2404
2405                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2406                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2407                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2408                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2409                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2410                         "<tr id=\"wpDeleteReasonListRow\">
2411                                 <td class='mw-label'>" .
2412                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2413                                 "</td>
2414                                 <td class='mw-input'>" .
2415                                         Xml::listDropDown( 'wpDeleteReasonList',
2416                                                 wfMsgForContent( 'deletereason-dropdown' ),
2417                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2418                                 "</td>
2419                         </tr>
2420                         <tr id=\"wpDeleteReasonRow\">
2421                                 <td class='mw-label'>" .
2422                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2423                                 "</td>
2424                                 <td class='mw-input'>" .
2425                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2426                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2427                                 "</td>
2428                         </tr>
2429                         <tr>
2430                                 <td></td>
2431                                 <td class='mw-input'>" .
2432                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2433                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2434                                 "</td>
2435                         </tr>
2436                         $suppress
2437                         <tr>
2438                                 <td></td>
2439                                 <td class='mw-submit'>" .
2440                                         Xml::submitButton( wfMsg( 'deletepage' ),
2441                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2442                                 "</td>
2443                         </tr>" .
2444                         Xml::closeElement( 'table' ) .
2445                         Xml::closeElement( 'fieldset' ) .
2446                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2447                         Xml::closeElement( 'form' );
2448
2449                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2450                                 $skin = $wgUser->getSkin();
2451                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2452                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2453                         }
2454
2455                 $wgOut->addHTML( $form );
2456                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2457         }
2458
2459         /**
2460          * Perform a deletion and output success or failure messages
2461          */
2462         public function doDelete( $reason, $suppress = false ) {
2463                 global $wgOut, $wgUser;
2464                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2465
2466                 $error = '';
2467                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2468                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2469                                 $deleted = $this->mTitle->getPrefixedText();
2470
2471                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2472                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2473
2474                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2475
2476                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2477                                 $wgOut->returnToMain( false );
2478                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2479                         } else {
2480                                 if( $error == '' ) {
2481                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2482                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2483                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2484                                 } else {
2485                                         $wgOut->showFatalError( $error );
2486                                 }
2487                         }
2488                 }
2489         }
2490
2491         /**
2492          * Back-end article deletion
2493          * Deletes the article with database consistency, writes logs, purges caches
2494          * Returns success
2495          */
2496         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2497                 global $wgUseSquid, $wgDeferredUpdateList;
2498                 global $wgUseTrackbacks;
2499
2500                 wfDebug( __METHOD__."\n" );
2501
2502                 $dbw = wfGetDB( DB_MASTER );
2503                 $ns = $this->mTitle->getNamespace();
2504                 $t = $this->mTitle->getDBkey();
2505                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2506
2507                 if( $t == '' || $id == 0 ) {
2508                         return false;
2509                 }
2510
2511                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2512                 array_push( $wgDeferredUpdateList, $u );
2513
2514                 // Bitfields to further suppress the content
2515                 if( $suppress ) {
2516                         $bitfield = 0;
2517                         // This should be 15...
2518                         $bitfield |= Revision::DELETED_TEXT;
2519                         $bitfield |= Revision::DELETED_COMMENT;
2520                         $bitfield |= Revision::DELETED_USER;
2521                         $bitfield |= Revision::DELETED_RESTRICTED;
2522                 } else {
2523                         $bitfield = 'rev_deleted';
2524                 }
2525
2526                 $dbw->begin();
2527                 // For now, shunt the revision data into the archive table.
2528                 // Text is *not* removed from the text table; bulk storage
2529                 // is left intact to avoid breaking block-compression or
2530                 // immutable storage schemes.
2531                 //
2532                 // For backwards compatibility, note that some older archive
2533                 // table entries will have ar_text and ar_flags fields still.
2534                 //
2535                 // In the future, we may keep revisions and mark them with
2536                 // the rev_deleted field, which is reserved for this purpose.
2537                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2538                         array(
2539                                 'ar_namespace'  => 'page_namespace',
2540                                 'ar_title'      => 'page_title',
2541                                 'ar_comment'    => 'rev_comment',
2542                                 'ar_user'       => 'rev_user',
2543                                 'ar_user_text'  => 'rev_user_text',
2544                                 'ar_timestamp'  => 'rev_timestamp',
2545                                 'ar_minor_edit' => 'rev_minor_edit',
2546                                 'ar_rev_id'     => 'rev_id',
2547                                 'ar_text_id'    => 'rev_text_id',
2548                                 'ar_text'       => '\'\'', // Be explicit to appease
2549                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2550                                 'ar_len'        => 'rev_len',
2551                                 'ar_page_id'    => 'page_id',
2552                                 'ar_deleted'    => $bitfield
2553                         ), array(
2554                                 'page_id' => $id,
2555                                 'page_id = rev_page'
2556                         ), __METHOD__
2557                 );
2558
2559                 # Delete restrictions for it
2560                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2561
2562                 # Now that it's safely backed up, delete it
2563                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2564                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2565                 if( !$ok ) {
2566                         $dbw->rollback();
2567                         return false;
2568                 }
2569
2570                 # Fix category table counts
2571                 $cats = array();
2572                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2573                 foreach( $res as $row ) {
2574                         $cats []= $row->cl_to;
2575                 }
2576                 $this->updateCategoryCounts( array(), $cats );
2577
2578                 # If using cascading deletes, we can skip some explicit deletes
2579                 if( !$dbw->cascadingDeletes() ) {
2580                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2581
2582                         if($wgUseTrackbacks)
2583                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2584
2585                         # Delete outgoing links
2586                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2587                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2588                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2589                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2590                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2591                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2592                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2593                 }
2594
2595                 # If using cleanup triggers, we can skip some manual deletes
2596                 if( !$dbw->cleanupTriggers() ) {
2597                         # Clean up recentchanges entries...
2598                         $dbw->delete( 'recentchanges',
2599                                 array( 'rc_type != '.RC_LOG,
2600                                         'rc_namespace' => $this->mTitle->getNamespace(),
2601                                         'rc_title' => $this->mTitle->getDBKey() ),
2602                                 __METHOD__ );
2603                         $dbw->delete( 'recentchanges',
2604                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2605                                 __METHOD__ );
2606                 }
2607
2608                 # Clear caches
2609                 Article::onArticleDelete( $this->mTitle );
2610
2611                 # Clear the cached article id so the interface doesn't act like we exist
2612                 $this->mTitle->resetArticleID( 0 );
2613
2614                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2615                 $logtype = $suppress ? 'suppress' : 'delete';
2616                 $log = new LogPage( $logtype );
2617
2618                 # Make sure logging got through
2619                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2620
2621                 $dbw->commit();
2622
2623                 return true;
2624         }
2625
2626         /**
2627          * Roll back the most recent consecutive set of edits to a page
2628          * from the same user; fails if there are no eligible edits to
2629          * roll back to, e.g. user is the sole contributor. This function
2630          * performs permissions checks on $wgUser, then calls commitRollback()
2631          * to do the dirty work
2632          *
2633          * @param $fromP String: Name of the user whose edits to rollback.
2634          * @param $summary String: Custom summary. Set to default summary if empty.
2635          * @param $token String: Rollback token.
2636          * @param $bot Boolean: If true, mark all reverted edits as bot.
2637          *
2638          * @param $resultDetails Array: contains result-specific array of additional values
2639          *    'alreadyrolled' : 'current' (rev)
2640          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2641          *
2642          * @return array of errors, each error formatted as
2643          *   array(messagekey, param1, param2, ...).
2644          * On success, the array is empty.  This array can also be passed to
2645          * OutputPage::showPermissionsErrorPage().
2646          */
2647         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2648                 global $wgUser;
2649                 $resultDetails = null;
2650
2651                 # Check permissions
2652                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2653                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2654                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2655
2656                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2657                         $errors[] = array( 'sessionfailure' );
2658
2659                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2660                         $errors[] = array( 'actionthrottledtext' );
2661                 }
2662                 # If there were errors, bail out now
2663                 if( !empty( $errors ) )
2664                         return $errors;
2665
2666                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2667         }
2668
2669         /**
2670          * Backend implementation of doRollback(), please refer there for parameter
2671          * and return value documentation
2672          *
2673          * NOTE: This function does NOT check ANY permissions, it just commits the
2674          * rollback to the DB Therefore, you should only call this function direct-
2675          * ly if you want to use custom permissions checks. If you don't, use
2676          * doRollback() instead.
2677          */
2678         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2679                 global $wgUseRCPatrol, $wgUser, $wgLang;
2680                 $dbw = wfGetDB( DB_MASTER );
2681
2682                 if( wfReadOnly() ) {
2683                         return array( array( 'readonlytext' ) );
2684                 }
2685
2686                 # Get the last editor
2687                 $current = Revision::newFromTitle( $this->mTitle );
2688                 if( is_null( $current ) ) {
2689                         # Something wrong... no page?
2690                         return array(array('notanarticle'));
2691                 }
2692
2693                 $from = str_replace( '_', ' ', $fromP );
2694                 if( $from != $current->getUserText() ) {
2695                         $resultDetails = array( 'current' => $current );
2696                         return array(array('alreadyrolled',
2697                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2698                                 htmlspecialchars($fromP),
2699                                 htmlspecialchars($current->getUserText())
2700                         ));
2701                 }
2702
2703                 # Get the last edit not by this guy
2704                 $user = intval( $current->getUser() );
2705                 $user_text = $dbw->addQuotes( $current->getUserText() );
2706                 $s = $dbw->selectRow( 'revision',
2707                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2708                         array(  'rev_page' => $current->getPage(),
2709                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2710                         ), __METHOD__,
2711                         array(  'USE INDEX' => 'page_timestamp',
2712                                 'ORDER BY'  => 'rev_timestamp DESC' )
2713                         );
2714                 if( $s === false ) {
2715                         # No one else ever edited this page
2716                         return array(array('cantrollback'));
2717                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2718                         # Only admins can see this text
2719                         return array(array('notvisiblerev'));
2720                 }
2721
2722                 $set = array();
2723                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2724                         # Mark all reverted edits as bot
2725                         $set['rc_bot'] = 1;
2726                 }
2727                 if( $wgUseRCPatrol ) {
2728                         # Mark all reverted edits as patrolled
2729                         $set['rc_patrolled'] = 1;
2730                 }
2731
2732                 if( $set ) {
2733                         $dbw->update( 'recentchanges', $set,
2734                                         array( /* WHERE */
2735                                                 'rc_cur_id' => $current->getPage(),
2736                                                 'rc_user_text' => $current->getUserText(),
2737                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2738                                         ), __METHOD__
2739                                 );
2740                 }
2741
2742                 # Generate the edit summary if necessary
2743                 $target = Revision::newFromId( $s->rev_id );
2744                 if( empty( $summary ) ){
2745                         $summary = wfMsgForContent( 'revertpage' );
2746                 }
2747
2748                 # Allow the custom summary to use the same args as the default message
2749                 $args = array(
2750                         $target->getUserText(), $from, $s->rev_id,
2751                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2752                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2753                 );
2754                 $summary = wfMsgReplaceArgs( $summary, $args );
2755
2756                 # Save
2757                 $flags = EDIT_UPDATE;
2758
2759                 if( $wgUser->isAllowed('minoredit') )
2760                         $flags |= EDIT_MINOR;
2761
2762                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2763                         $flags |= EDIT_FORCE_BOT;
2764                 # Actually store the edit
2765                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2766                 if( !empty( $status->value['revision'] ) ) {
2767                         $revId = $status->value['revision']->getId();
2768                 } else {
2769                         $revId = false;
2770                 }
2771
2772                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2773
2774                 $resultDetails = array(
2775                         'summary' => $summary,
2776                         'current' => $current,
2777                         'target' => $target,
2778                         'newid' => $revId
2779                 );
2780                 return array();
2781         }
2782
2783         /**
2784          * User interface for rollback operations
2785          */
2786         public function rollback() {
2787                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2788                 $details = null;
2789
2790                 $result = $this->doRollback(
2791                         $wgRequest->getVal( 'from' ),
2792                         $wgRequest->getText( 'summary' ),
2793                         $wgRequest->getVal( 'token' ),
2794                         $wgRequest->getBool( 'bot' ),
2795                         $details
2796                 );
2797
2798                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2799                         $wgOut->rateLimited();
2800                         return;
2801                 }
2802                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2803                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2804                         $errArray = $result[0];
2805                         $errMsg = array_shift( $errArray );
2806                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2807                         if( isset( $details['current'] ) ){
2808                                 $current = $details['current'];
2809                                 if( $current->getComment() != '' ) {
2810                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2811                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2812                                 }
2813                         }
2814                         return;
2815                 }
2816                 # Display permissions errors before read-only message -- there's no
2817                 # point in misleading the user into thinking the inability to rollback
2818                 # is only temporary.
2819                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2820                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2821                         # move any 'readonlytext' error manually.
2822                         $out = array();
2823                         foreach( $result as $error ) {
2824                                 if( $error != array( 'readonlytext' ) ) {
2825                                         $out []= $error;
2826                                 }
2827                         }
2828                         $wgOut->showPermissionsErrorPage( $out );
2829                         return;
2830                 }
2831                 if( $result == array( array( 'readonlytext' ) ) ) {
2832                         $wgOut->readOnlyPage();
2833                         return;
2834                 }
2835
2836                 $current = $details['current'];
2837                 $target = $details['target'];
2838                 $newId = $details['newid'];
2839                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2840                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2841                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2842                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2843                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2844                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2845                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2846                 $wgOut->returnToMain( false, $this->mTitle );
2847
2848                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2849                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2850                         $de->showDiff( '', '' );
2851                 }
2852         }
2853
2854
2855         /**
2856          * Do standard deferred updates after page view
2857          */
2858         public function viewUpdates() {
2859                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2860                 # Don't update page view counters on views from bot users (bug 14044)
2861                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2862                         Article::incViewCount( $this->getID() );
2863                         $u = new SiteStatsUpdate( 1, 0, 0 );
2864                         array_push( $wgDeferredUpdateList, $u );
2865                 }
2866                 # Update newtalk / watchlist notification status
2867                 $wgUser->clearNotification( $this->mTitle );
2868         }
2869
2870         /**
2871          * Prepare text which is about to be saved.
2872          * Returns a stdclass with source, pst and output members
2873          */
2874         public function prepareTextForEdit( $text, $revid=null ) {
2875                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2876                         // Already prepared
2877                         return $this->mPreparedEdit;
2878                 }
2879                 global $wgParser;
2880                 $edit = (object)array();
2881                 $edit->revid = $revid;
2882                 $edit->newText = $text;
2883                 $edit->pst = $this->preSaveTransform( $text );
2884                 $options = new ParserOptions;
2885                 $options->setTidy( true );
2886                 $options->enableLimitReport();
2887                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2888                 $edit->oldText = $this->getContent();
2889                 $this->mPreparedEdit = $edit;
2890                 return $edit;
2891         }
2892
2893         /**
2894          * Do standard deferred updates after page edit.
2895          * Update links tables, site stats, search index and message cache.
2896          * Purges pages that include this page if the text was changed here.
2897          * Every 100th edit, prune the recent changes table.
2898          *
2899          * @private
2900          * @param $text New text of the article
2901          * @param $summary Edit summary
2902          * @param $minoredit Minor edit
2903          * @param $timestamp_of_pagechange Timestamp associated with the page change
2904          * @param $newid rev_id value of the new revision
2905          * @param $changed Whether or not the content actually changed
2906          */
2907         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2908                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2909
2910                 wfProfileIn( __METHOD__ );
2911
2912                 # Parse the text
2913                 # Be careful not to double-PST: $text is usually already PST-ed once
2914                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2915                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2916                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2917                 } else {
2918                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2919                         $editInfo = $this->mPreparedEdit;
2920                 }
2921
2922                 # Save it to the parser cache
2923                 if( $wgEnableParserCache ) {
2924                         $popts = new ParserOptions;
2925                         $popts->setTidy( true );
2926                         $popts->enableLimitReport();
2927                         $parserCache = ParserCache::singleton();
2928                         $parserCache->save( $editInfo->output, $this, $popts );
2929                 }
2930
2931                 # Update the links tables
2932                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2933                 $u->doUpdate();
2934
2935                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2936
2937                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2938                         if( 0 == mt_rand( 0, 99 ) ) {
2939                                 // Flush old entries from the `recentchanges` table; we do this on
2940                                 // random requests so as to avoid an increase in writes for no good reason
2941                                 global $wgRCMaxAge;
2942                                 $dbw = wfGetDB( DB_MASTER );
2943                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2944                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2945                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2946                                 $dbw->query( $sql );
2947                         }
2948                 }
2949
2950                 $id = $this->getID();
2951                 $title = $this->mTitle->getPrefixedDBkey();
2952                 $shortTitle = $this->mTitle->getDBkey();
2953
2954                 if( 0 == $id ) {
2955                         wfProfileOut( __METHOD__ );
2956                         return;
2957                 }
2958
2959                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2960                 array_push( $wgDeferredUpdateList, $u );
2961                 $u = new SearchUpdate( $id, $title, $text );
2962                 array_push( $wgDeferredUpdateList, $u );
2963
2964                 # If this is another user's talk page, update newtalk
2965                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2966                 # load of user talk pages and piss people off, nor if it's a minor edit
2967                 # by a properly-flagged bot.
2968                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2969                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2970                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2971                                 $other = User::newFromName( $shortTitle, false );
2972                                 if( !$other ) {
2973                                         wfDebug( __METHOD__.": invalid username\n" );
2974                                 } elseif( User::isIP( $shortTitle ) ) {
2975                                         // An anonymous user
2976                                         $other->setNewtalk( true );
2977                                 } elseif( $other->isLoggedIn() ) {
2978                                         $other->setNewtalk( true );
2979                                 } else {
2980                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2981                                 }
2982                         }
2983                 }
2984
2985                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2986                         $wgMessageCache->replace( $shortTitle, $text );
2987                 }
2988
2989                 wfProfileOut( __METHOD__ );
2990         }
2991
2992         /**
2993          * Perform article updates on a special page creation.
2994          *
2995          * @param $rev Revision object
2996          *
2997          * @todo This is a shitty interface function. Kill it and replace the
2998          * other shitty functions like editUpdates and such so it's not needed
2999          * anymore.
3000          */
3001         public function createUpdates( $rev ) {
3002                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3003                 $this->mTotalAdjustment = 1;
3004                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3005                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3006         }
3007
3008         /**
3009          * Generate the navigation links when browsing through an article revisions
3010          * It shows the information as:
3011          *   Revision as of \<date\>; view current revision
3012          *   \<- Previous version | Next Version -\>
3013          *
3014          * @param $oldid String: revision ID of this article revision
3015          */
3016         public function setOldSubtitle( $oldid = 0 ) {
3017                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3018
3019                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3020                         return;
3021                 }
3022
3023                 $revision = Revision::newFromId( $oldid );
3024
3025                 $current = ( $oldid == $this->mLatest );
3026                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3027                 $sk = $wgUser->getSkin();
3028                 $lnk = $current
3029                         ? wfMsgHtml( 'currentrevisionlink' )
3030                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
3031                 $curdiff = $current
3032                         ? wfMsgHtml( 'diff' )
3033                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
3034                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3035                 $prevlink = $prev
3036                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
3037                         : wfMsgHtml( 'previousrevision' );
3038                 $prevdiff = $prev
3039                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
3040                         : wfMsgHtml( 'diff' );
3041                 $nextlink = $current
3042                         ? wfMsgHtml( 'nextrevision' )
3043                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
3044                 $nextdiff = $current
3045                         ? wfMsgHtml( 'diff' )
3046                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
3047
3048                 $cdel='';
3049                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3050                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3051                         if( $revision->isCurrent() ) {
3052                         // We don't handle top deleted edits too well
3053                                 $cdel = wfMsgHtml( 'rev-delundel' );
3054                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3055                         // If revision was hidden from sysops
3056                                 $cdel = wfMsgHtml( 'rev-delundel' );
3057                         } else {
3058                                 $cdel = $sk->makeKnownLinkObj( $revdel,
3059                                         wfMsgHtml('rev-delundel'),
3060                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
3061                                         '&oldid=' . urlencode( $oldid ) );
3062                                 // Bolden oversighted content
3063                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3064                                         $cdel = "<strong>$cdel</strong>";
3065                         }
3066                         $cdel = "(<small>$cdel</small>) ";
3067                 }
3068                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3069                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3070                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3071
3072                 $m = wfMsg( 'revision-info-current' );
3073                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3074                         ? 'revision-info-current'
3075                         : 'revision-info';
3076
3077                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ),
3078                         $td, $userlinks, $revision->getID() ) . "</div>\n" .
3079
3080                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3081                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3082                 $wgOut->setSubtitle( $r );
3083         }
3084
3085         /**
3086          * This function is called right before saving the wikitext,
3087          * so we can do things like signatures and links-in-context.
3088          *
3089          * @param $text String
3090          */
3091         public function preSaveTransform( $text ) {
3092                 global $wgParser, $wgUser;
3093                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3094         }
3095
3096         /* Caching functions */
3097
3098         /**
3099          * checkLastModified returns true if it has taken care of all
3100          * output to the client that is necessary for this request.
3101          * (that is, it has sent a cached version of the page)
3102          */
3103         protected function tryFileCache() {
3104                 static $called = false;
3105                 if( $called ) {
3106                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3107                         return false;
3108                 }
3109                 $called = true;
3110                 if( $this->isFileCacheable() ) {
3111                         $cache = new HTMLFileCache( $this->mTitle );
3112                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3113                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3114                                 $cache->loadFromFileCache();
3115                                 return true;
3116                         } else {
3117                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3118                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3119                         }
3120                 } else {
3121                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3122                 }
3123                 return false;
3124         }
3125
3126         /**
3127          * Check if the page can be cached
3128          * @return bool
3129          */
3130         public function isFileCacheable() {
3131                 $cacheable = false;
3132                 if( HTMLFileCache::useFileCache() ) {
3133                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3134                         // Extension may have reason to disable file caching on some pages.
3135                         if( $cacheable ) {
3136                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3137                         }
3138                 }
3139                 return $cacheable;
3140         }
3141
3142         /**
3143          * Loads page_touched and returns a value indicating if it should be used
3144          *
3145          */
3146         public function checkTouched() {
3147                 if( !$this->mDataLoaded ) {
3148                         $this->loadPageData();
3149                 }
3150                 return !$this->mIsRedirect;
3151         }
3152
3153         /**
3154          * Get the page_touched field
3155          */
3156         public function getTouched() {
3157                 # Ensure that page data has been loaded
3158                 if( !$this->mDataLoaded ) {
3159                         $this->loadPageData();
3160                 }
3161                 return $this->mTouched;
3162         }
3163
3164         /**
3165          * Get the page_latest field
3166          */
3167         public function getLatest() {
3168                 if( !$this->mDataLoaded ) {
3169                         $this->loadPageData();
3170                 }
3171                 return (int)$this->mLatest;
3172         }
3173
3174         /**
3175          * Edit an article without doing all that other stuff
3176          * The article must already exist; link tables etc
3177          * are not updated, caches are not flushed.
3178          *
3179          * @param $text String: text submitted
3180          * @param $comment String: comment submitted
3181          * @param $minor Boolean: whereas it's a minor modification
3182          */
3183         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3184                 wfProfileIn( __METHOD__ );
3185
3186                 $dbw = wfGetDB( DB_MASTER );
3187                 $revision = new Revision( array(
3188                         'page'       => $this->getId(),
3189                         'text'       => $text,
3190                         'comment'    => $comment,
3191                         'minor_edit' => $minor ? 1 : 0,
3192                         ) );
3193                 $revision->insertOn( $dbw );
3194                 $this->updateRevisionOn( $dbw, $revision );
3195
3196                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3197
3198                 wfProfileOut( __METHOD__ );
3199         }
3200
3201         /**
3202          * Used to increment the view counter
3203          *
3204          * @param $id Integer: article id
3205          */
3206         public static function incViewCount( $id ) {
3207                 $id = intval( $id );
3208                 global $wgHitcounterUpdateFreq, $wgDBtype;
3209
3210                 $dbw = wfGetDB( DB_MASTER );
3211                 $pageTable = $dbw->tableName( 'page' );
3212                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3213                 $acchitsTable = $dbw->tableName( 'acchits' );
3214
3215                 if( $wgHitcounterUpdateFreq <= 1 ) {
3216                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3217                         return;
3218                 }
3219
3220                 # Not important enough to warrant an error page in case of failure
3221                 $oldignore = $dbw->ignoreErrors( true );
3222
3223                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3224
3225                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3226                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3227                         # Most of the time (or on SQL errors), skip row count check
3228                         $dbw->ignoreErrors( $oldignore );
3229                         return;
3230                 }
3231
3232                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3233                 $row = $dbw->fetchObject( $res );
3234                 $rown = intval( $row->n );
3235                 if( $rown >= $wgHitcounterUpdateFreq ){
3236                         wfProfileIn( 'Article::incViewCount-collect' );
3237                         $old_user_abort = ignore_user_abort( true );
3238
3239                         if($wgDBtype == 'mysql')
3240                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3241                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3242                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3243                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3244                                 'GROUP BY hc_id');
3245                         $dbw->query("DELETE FROM $hitcounterTable");
3246                         if($wgDBtype == 'mysql') {
3247                                 $dbw->query('UNLOCK TABLES');
3248                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3249                                         'WHERE page_id = hc_id');
3250                         }
3251                         else {
3252                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3253                                         "FROM $acchitsTable WHERE page_id = hc_id");
3254                         }
3255                         $dbw->query("DROP TABLE $acchitsTable");
3256
3257                         ignore_user_abort( $old_user_abort );
3258                         wfProfileOut( 'Article::incViewCount-collect' );
3259                 }
3260                 $dbw->ignoreErrors( $oldignore );
3261         }
3262
3263         /**#@+
3264          * The onArticle*() functions are supposed to be a kind of hooks
3265          * which should be called whenever any of the specified actions
3266          * are done.
3267          *
3268          * This is a good place to put code to clear caches, for instance.
3269          *
3270          * This is called on page move and undelete, as well as edit
3271          *
3272          * @param $title a title object
3273          */
3274
3275         public static function onArticleCreate( $title ) {
3276                 # Update existence markers on article/talk tabs...
3277                 if( $title->isTalkPage() ) {
3278                         $other = $title->getSubjectPage();
3279                 } else {
3280                         $other = $title->getTalkPage();
3281                 }
3282                 $other->invalidateCache();
3283                 $other->purgeSquid();
3284
3285                 $title->touchLinks();
3286                 $title->purgeSquid();
3287                 $title->deleteTitleProtection();
3288         }
3289
3290         public static function onArticleDelete( $title ) {
3291                 global $wgMessageCache;
3292                 # Update existence markers on article/talk tabs...
3293                 if( $title->isTalkPage() ) {
3294                         $other = $title->getSubjectPage();
3295                 } else {
3296                         $other = $title->getTalkPage();
3297                 }
3298                 $other->invalidateCache();
3299                 $other->purgeSquid();
3300
3301                 $title->touchLinks();
3302                 $title->purgeSquid();
3303
3304                 # File cache
3305                 HTMLFileCache::clearFileCache( $title );
3306
3307                 # Messages
3308                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3309                         $wgMessageCache->replace( $title->getDBkey(), false );
3310                 }
3311                 # Images
3312                 if( $title->getNamespace() == NS_FILE ) {
3313                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3314                         $update->doUpdate();
3315                 }
3316                 # User talk pages
3317                 if( $title->getNamespace() == NS_USER_TALK ) {
3318                         $user = User::newFromName( $title->getText(), false );
3319                         $user->setNewtalk( false );
3320                 }
3321                 # Image redirects
3322                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3323         }
3324
3325         /**
3326          * Purge caches on page update etc
3327          */
3328         public static function onArticleEdit( $title, $flags = '' ) {
3329                 global $wgDeferredUpdateList;
3330
3331                 // Invalidate caches of articles which include this page
3332                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3333
3334                 // Invalidate the caches of all pages which redirect here
3335                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3336
3337                 # Purge squid for this page only
3338                 $title->purgeSquid();
3339
3340                 # Clear file cache for this page only
3341                 HTMLFileCache::clearFileCache( $title );
3342         }
3343
3344         /**#@-*/
3345
3346         /**
3347          * Overriden by ImagePage class, only present here to avoid a fatal error
3348          * Called for ?action=revert
3349          */
3350         public function revert() {
3351                 global $wgOut;
3352                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3353         }
3354
3355         /**
3356          * Info about this page
3357          * Called for ?action=info when $wgAllowPageInfo is on.
3358          */
3359         public function info() {
3360                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3361
3362                 if( !$wgAllowPageInfo ) {
3363                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3364                         return;
3365                 }
3366
3367                 $page = $this->mTitle->getSubjectPage();
3368
3369                 $wgOut->setPagetitle( $page->getPrefixedText() );
3370                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3371                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3372
3373                 if( !$this->mTitle->exists() ) {
3374                         $wgOut->addHTML( '<div class="noarticletext">' );
3375                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3376                                 // This doesn't quite make sense; the user is asking for
3377                                 // information about the _page_, not the message... -- RC
3378                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3379                         } else {
3380                                 $msg = $wgUser->isLoggedIn()
3381                                         ? 'noarticletext'
3382                                         : 'noarticletextanon';
3383                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3384                         }
3385                         $wgOut->addHTML( '</div>' );
3386                 } else {
3387                         $dbr = wfGetDB( DB_SLAVE );
3388                         $wl_clause = array(
3389                                 'wl_title'     => $page->getDBkey(),
3390                                 'wl_namespace' => $page->getNamespace() );
3391                         $numwatchers = $dbr->selectField(
3392                                 'watchlist',
3393                                 'COUNT(*)',
3394                                 $wl_clause,
3395                                 __METHOD__,
3396                                 $this->getSelectOptions() );
3397
3398                         $pageInfo = $this->pageCountInfo( $page );
3399                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3400
3401                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3402                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3403                         if( $talkInfo ) {
3404                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3405                         }
3406                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3407                         if( $talkInfo ) {
3408                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3409                         }
3410                         $wgOut->addHTML( '</ul>' );
3411                 }
3412         }
3413
3414         /**
3415          * Return the total number of edits and number of unique editors
3416          * on a given page. If page does not exist, returns false.
3417          *
3418          * @param $title Title object
3419          * @return array
3420          */
3421         protected function pageCountInfo( $title ) {
3422                 $id = $title->getArticleId();
3423                 if( $id == 0 ) {
3424                         return false;
3425                 }
3426                 $dbr = wfGetDB( DB_SLAVE );
3427                 $rev_clause = array( 'rev_page' => $id );
3428                 $edits = $dbr->selectField(
3429                         'revision',
3430                         'COUNT(rev_page)',
3431                         $rev_clause,
3432                         __METHOD__,
3433                         $this->getSelectOptions()
3434                 );
3435                 $authors = $dbr->selectField(
3436                         'revision',
3437                         'COUNT(DISTINCT rev_user_text)',
3438                         $rev_clause,
3439                         __METHOD__,
3440                         $this->getSelectOptions()
3441                 );
3442                 return array( 'edits' => $edits, 'authors' => $authors );
3443         }
3444
3445         /**
3446          * Return a list of templates used by this article.
3447          * Uses the templatelinks table
3448          *
3449          * @return Array of Title objects
3450          */
3451         public function getUsedTemplates() {
3452                 $result = array();
3453                 $id = $this->mTitle->getArticleID();
3454                 if( $id == 0 ) {
3455                         return array();
3456                 }
3457                 $dbr = wfGetDB( DB_SLAVE );
3458                 $res = $dbr->select( array( 'templatelinks' ),
3459                         array( 'tl_namespace', 'tl_title' ),
3460                         array( 'tl_from' => $id ),
3461                         __METHOD__ );
3462                 if( $res !== false ) {
3463                         foreach( $res as $row ) {
3464                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3465                         }
3466                 }
3467                 $dbr->freeResult( $res );
3468                 return $result;
3469         }
3470
3471         /**
3472          * Returns a list of hidden categories this page is a member of.
3473          * Uses the page_props and categorylinks tables.
3474          *
3475          * @return Array of Title objects
3476          */
3477         public function getHiddenCategories() {
3478                 $result = array();
3479                 $id = $this->mTitle->getArticleID();
3480                 if( $id == 0 ) {
3481                         return array();
3482                 }
3483                 $dbr = wfGetDB( DB_SLAVE );
3484                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3485                         array( 'cl_to' ),
3486                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3487                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3488                         __METHOD__ );
3489                 if( $res !== false ) {
3490                         foreach( $res as $row ) {
3491                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3492                         }
3493                 }
3494                 $dbr->freeResult( $res );
3495                 return $result;
3496         }
3497
3498         /**
3499         * Return an applicable autosummary if one exists for the given edit.
3500         * @param $oldtext String: the previous text of the page.
3501         * @param $newtext String: The submitted text of the page.
3502         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3503         * @return string An appropriate autosummary, or an empty string.
3504         */
3505         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3506                 # Decide what kind of autosummary is needed.
3507
3508                 # Redirect autosummaries
3509                 $ot = Title::newFromRedirect( $oldtext );
3510                 $rt = Title::newFromRedirect( $newtext );
3511                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3512                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3513                 }
3514
3515                 # New page autosummaries
3516                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3517                         # If they're making a new article, give its text, truncated, in the summary.
3518                         global $wgContLang;
3519                         $truncatedtext = $wgContLang->truncate(
3520                                 str_replace("\n", ' ', $newtext),
3521                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3522                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3523                 }
3524
3525                 # Blanking autosummaries
3526                 if( $oldtext != '' && $newtext == '' ) {
3527                         return wfMsgForContent( 'autosumm-blank' );
3528                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3529                         # Removing more than 90% of the article
3530                         global $wgContLang;
3531                         $truncatedtext = $wgContLang->truncate(
3532                                 $newtext,
3533                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3534                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3535                 }
3536
3537                 # If we reach this point, there's no applicable autosummary for our case, so our
3538                 # autosummary is empty.
3539                 return '';
3540         }
3541
3542         /**
3543          * Add the primary page-view wikitext to the output buffer
3544          * Saves the text into the parser cache if possible.
3545          * Updates templatelinks if it is out of date.
3546          *
3547          * @param $text String
3548          * @param $cache Boolean
3549          */
3550         public function outputWikiText( $text, $cache = true ) {
3551                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3552
3553                 $popts = $wgOut->parserOptions();
3554                 $popts->setTidy(true);
3555                 $popts->enableLimitReport();
3556                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3557                         $popts, true, true, $this->getRevIdFetched() );
3558                 $popts->setTidy(false);
3559                 $popts->enableLimitReport( false );
3560                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3561                         $parserCache = ParserCache::singleton();
3562                         $parserCache->save( $parserOutput, $this, $popts );
3563                 }
3564                 // Make sure file cache is not used on uncacheable content.
3565                 // Output that has magic words in it can still use the parser cache
3566                 // (if enabled), though it will generally expire sooner.
3567                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3568                         $wgUseFileCache = false;
3569                 }
3570
3571                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3572                         // templatelinks table may have become out of sync,
3573                         // especially if using variable-based transclusions.
3574                         // For paranoia, check if things have changed and if
3575                         // so apply updates to the database. This will ensure
3576                         // that cascaded protections apply as soon as the changes
3577                         // are visible.
3578
3579                         # Get templates from templatelinks
3580                         $id = $this->mTitle->getArticleID();
3581
3582                         $tlTemplates = array();
3583
3584                         $dbr = wfGetDB( DB_SLAVE );
3585                         $res = $dbr->select( array( 'templatelinks' ),
3586                                 array( 'tl_namespace', 'tl_title' ),
3587                                 array( 'tl_from' => $id ),
3588                                 __METHOD__ );
3589
3590                         global $wgContLang;
3591                         foreach( $res as $row ) {
3592                                 $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3593                         }
3594
3595                         # Get templates from parser output.
3596                         $poTemplates = array();
3597                         foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3598                                 foreach ( $templates as $dbk => $id ) {
3599                                         $key = $row->tl_namespace . ':'. $row->tl_title;
3600                                         $poTemplates["$ns:$dbk"] = true;
3601                                 }
3602                         }
3603
3604                         # Get the diff
3605                         # Note that we simulate array_diff_key in PHP <5.0.x
3606                         $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3607
3608                         if( count( $templates_diff ) > 0 ) {
3609                                 # Whee, link updates time.
3610                                 $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3611                                 $u->doUpdate();
3612                         }
3613                 }
3614
3615                 $wgOut->addParserOutput( $parserOutput );
3616         }
3617
3618         /**
3619          * Update all the appropriate counts in the category table, given that
3620          * we've added the categories $added and deleted the categories $deleted.
3621          *
3622          * @param $added array   The names of categories that were added
3623          * @param $deleted array The names of categories that were deleted
3624          * @return null
3625          */
3626         public function updateCategoryCounts( $added, $deleted ) {
3627                 $ns = $this->mTitle->getNamespace();
3628                 $dbw = wfGetDB( DB_MASTER );
3629
3630                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3631                 # exist, we might legitimately not create it, but it's simpler to just
3632                 # create it and then give it a negative value, since the value is bogus
3633                 # anyway.
3634                 #
3635                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3636                 $insertCats = array_merge( $added, $deleted );
3637                 if( !$insertCats ) {
3638                         # Okay, nothing to do
3639                         return;
3640                 }
3641                 $insertRows = array();
3642                 foreach( $insertCats as $cat ) {
3643                         $insertRows[] = array( 'cat_title' => $cat );
3644                 }
3645                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3646
3647                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3648                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3649                 if( $ns == NS_CATEGORY ) {
3650                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3651                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3652                 } elseif( $ns == NS_FILE ) {
3653                         $addFields[]    = 'cat_files = cat_files + 1';
3654                         $removeFields[] = 'cat_files = cat_files - 1';
3655                 }
3656
3657                 if( $added ) {
3658                         $dbw->update(
3659                                 'category',
3660                                 $addFields,
3661                                 array( 'cat_title' => $added ),
3662                                 __METHOD__
3663                         );
3664                 }
3665                 if( $deleted ) {
3666                         $dbw->update(
3667                                 'category',
3668                                 $removeFields,
3669                                 array( 'cat_title' => $deleted ),
3670                                 __METHOD__
3671                         );
3672                 }
3673         }
3674 }