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                 $deletedBit = $dbr->bitAnd('rev_deleted', 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 $deletedBit = 0
 707                         GROUP BY rev_user, rev_user_text, user_real_name
 708                         ORDER BY timestamp DESC";
 709
 710                 if($limit > 0)
 711                         $sql = $dbr->limitResult($sql, $limit, $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                 # If we got diff and oldid in the query, we want to see a
 797                 # diff page instead of the article.
 798                 if( !is_null( $diff ) ) {
 799                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 800
 801                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 802                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 803                         // DifferenceEngine directly fetched the revision:
 804                         $this->mRevIdFetched = $de->mNewid;
 805                         $de->showDiffPage( $diffOnly );
 806
 807                         // Needed to get the page's current revision
 808                         $this->loadPageData();
 809                         if( $diff == 0 || $diff == $this->mLatest ) {
 810                                 # Run view updates for current revision only
 811                                 $this->viewUpdates();
 812                         }
 813                         wfProfileOut( __METHOD__ );
 814                         return;
 815                 }
 816
 817                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
 818                         # User/User_talk subpages are not modified. (bug 11443)
 819                         if( !$this->mTitle->isSubpage() ) {
 820                                 $block = new Block();
 821                                 if( $block->load( $this->mTitle->getBaseText() ) ) {
 822                                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 823                                 }
 824                         }
 825                 }
 826
 827                 # Should the parser cache be used?
 828                 $pcache = $this->useParserCache( $oldid );
 829                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 830                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 831                         wfIncrStats( 'pcache_miss_stub' );
 832                 }
 833
 834                 $wasRedirected = false;
 835                 if( isset( $this->mRedirectedFrom ) ) {
 836                         // This is an internally redirected page view.
 837                         // We'll need a backlink to the source page for navigation.
 838                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 839                                 $redir = $sk->link(
 840                                         $this->mRedirectedFrom,
 841                                         null,
 842                                         array(),
 843                                         array( 'redirect' => 'no' ),
 844                                         array( 'known', 'noclasses' )
 845                                 );
 846                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 847                                 $wgOut->setSubtitle( $s );
 848
 849                                 // Set the fragment if one was specified in the redirect
 850                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 851                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 852                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 853                                 }
 854
 855                                 // Add a <link rel="canonical"> tag
 856                                 $wgOut->addLink( array( 'rel' => 'canonical',
 857                                         'href' => $this->mTitle->getLocalURL() )
 858                                 );
 859                                 $wasRedirected = true;
 860                         }
 861                 } elseif( !empty( $rdfrom ) ) {
 862                         // This is an externally redirected view, from some other wiki.
 863                         // If it was reported from a trusted site, supply a backlink.
 864                         global $wgRedirectSources;
 865                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 866                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 867                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 868                                 $wgOut->setSubtitle( $s );
 869                                 $wasRedirected = true;
 870                         }
 871                 }
 872
 873                 # Allow a specific header on talk pages, like [[MediaWiki:Talkpagetext]]
 874                 if( $this->mTitle->isTalkPage() ) {
 875                         $msg = wfMsgNoTrans( 'talkpageheader' );
 876                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
 877                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
 878                         }
 879                 }
 880
 881                 $outputDone = false;
 882                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 883                 if( $pcache && $wgOut->tryParserCache( $this ) ) {
 884                         // Ensure that UI elements requiring revision ID have
 885                         // the correct version information.
 886                         $wgOut->setRevisionId( $this->mLatest );
 887                         $outputDone = true;
 888                 }
 889                 # Fetch content and check for errors
 890                 if( !$outputDone ) {
 891                         # If the article does not exist and was deleted/moved, show the log
 892                         if( $this->getID() == 0 ) {
 893                                 $this->showLogs();
 894                         }
 895                         $text = $this->getContent();
 896                         // For now, check also for ID until getContent actually returns
 897                         // false for pages that do not exists
 898                         if( $text === false || $this->getID() === 0 ) {
 899                                 # Failed to load, replace text with error message
 900                                 $t = $this->mTitle->getPrefixedText();
 901                                 if( $oldid ) {
 902                                         $d = wfMsgExt( 'missingarticle-rev', 'escape', $oldid );
 903                                         $text = wfMsgExt( 'missing-article', 'parsemag', $t, $d );
 904                                 // Always use page content for pages in the MediaWiki namespace
 905                                 // since it contains the default message
 906                                 } elseif ( $this->mTitle->getNamespace() != NS_MEDIAWIKI ) {
 907                                         $text = wfMsgExt( 'noarticletext', 'parsemag' );
 908                                 }
 909                         }
 910
 911                         # Non-existent pages
 912                         if( $this->getID() === 0 ) {
 913                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 914                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 915                                 if( !$this->hasViewableContent() ) {
 916                                         // If there's no backing content, send a 404 Not Found
 917                                         // for better machine handling of broken links.
 918                                         $return404 = true;
 919                                 }
 920                         }
 921
 922                         if( $return404 ) {
 923                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 924                         }
 925
 926                         # Another whitelist check in case oldid is altering the title
 927                         if( !$this->mTitle->userCanRead() ) {
 928                                 $wgOut->loginToUse();
 929                                 $wgOut->output();
 930                                 $wgOut->disable();
 931                                 wfProfileOut( __METHOD__ );
 932                                 return;
 933                         }
 934
 935                         # For ?curid=x urls, disallow indexing
 936                         if( $wgRequest->getInt('curid') )
 937                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 938
 939                         # We're looking at an old revision
 940                         if( !empty( $oldid ) ) {
 941                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 942                                 if( is_null( $this->mRevision ) ) {
 943                                         // FIXME: This would be a nice place to load the 'no such page' text.
 944                                 } else {
 945                                         $this->setOldSubtitle( $oldid );
 946                                         # Allow admins to see deleted content if explicitly requested
 947                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 948                                                 // If the user is not allowed to see it...
 949                                                 if( !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
 950                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 951                                                                 'rev-deleted-text-permission' );
 952                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 953                                                         wfProfileOut( __METHOD__ );
 954                                                         return;
 955                                                 // If the user needs to confirm that they want to see it...
 956                                                 } else if( !$unhide ) {
 957                                                         # Give explanation and add a link to view the revision...
 958                                                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
 959                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 960                                                                 array('rev-deleted-text-unhide',$link) );
 961                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 962                                                         wfProfileOut( __METHOD__ );
 963                                                         return;
 964                                                 // We are allowed to see...
 965                                                 } else {
 966                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 967                                                                 'rev-deleted-text-view' );
 968                                                 }
 969                                         }
 970                                         // Is this the current revision and otherwise cacheable? Try the parser cache...
 971                                         if( $oldid === $this->getLatest() && $this->useParserCache( false )
 972                                                 && $wgOut->tryParserCache( $this ) )
 973                                         {
 974                                                 $outputDone = true;
 975                                         }
 976                                 }
 977                         }
 978
 979                         // Ensure that UI elements requiring revision ID have
 980                         // the correct version information.
 981                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 982
 983                         if( $outputDone ) {
 984                                 // do nothing...
 985                         // Pages containing custom CSS or JavaScript get special treatment
 986                         } else if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 987                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 988                                 // Give hooks a chance to customise the output
 989                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 990                                         // Wrap the whole lot in a <pre> and don't parse
 991                                         $m = array();
 992                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 993                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 994                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 995                                         $wgOut->addHTML( "\n</pre>\n" );
 996                                 }
 997                         } else if( $rt = Title::newFromRedirectArray( $text ) ) { # get an array of redirect targets
 998                                 # Don't append the subtitle if this was an old revision
 999                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
1000                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
1001                                 $wgOut->addParserOutputNoText( $parseout );
1002                         } else if( $pcache ) {
1003                                 # Display content and save to parser cache
1004                                 $this->outputWikiText( $text );
1005                         } else {
1006                                 # Display content, don't attempt to save to parser cache
1007                                 # Don't show section-edit links on old revisions... this way lies madness.
1008                                 if( !$this->isCurrent() ) {
1009                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
1010                                 }
1011                                 # Display content and don't save to parser cache
1012                                 # With timing hack -- TS 2006-07-26
1013                                 $time = -wfTime();
1014                                 $this->outputWikiText( $text, false );
1015                                 $time += wfTime();
1016
1017                                 # Timing hack
1018                                 if( $time > 3 ) {
1019                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1020                                                 $this->mTitle->getPrefixedDBkey()));
1021                                 }
1022
1023                                 if( !$this->isCurrent() ) {
1024                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
1025                                 }
1026                         }
1027                 }
1028                 /* title may have been set from the cache */
1029                 $t = $wgOut->getPageTitle();
1030                 if( empty( $t ) ) {
1031                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1032
1033                         # For the main page, overwrite the <title> element with the con-
1034                         # tents of 'pagetitle-view-mainpage' instead of the default (if
1035                         # that's not empty).
1036                         if( $this->mTitle->equals( Title::newMainPage() ) &&
1037                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
1038                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
1039                         }
1040                 }
1041
1042                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1043                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1044                         $wgOut->addWikiMsg('anontalkpagetext');
1045                 }
1046
1047                 # If we have been passed an &rcid= parameter, we want to give the user a
1048                 # chance to mark this new article as patrolled.
1049                 if( !empty( $rcid ) && $this->mTitle->exists() && $this->mTitle->quickUserCan( 'patrol' ) ) {
1050                         $wgOut->addHTML(
1051                                 "<div class='patrollink'>" .
1052                                         wfMsgHtml(
1053                                                 'markaspatrolledlink',
1054                                                 $sk->link(
1055                                                         $this->mTitle,
1056                                                         wfMsgHtml( 'markaspatrolledtext' ),
1057                                                         array(),
1058                                                         array(
1059                                                                 'action' => 'markpatrolled',
1060                                                                 'rcid' => $rcid
1061                                                         ),
1062                                                         array( 'known', 'noclasses' )
1063                                                 )
1064                                         ) .
1065                                 '</div>'
1066                         );
1067                 }
1068
1069                 # Trackbacks
1070                 if( $wgUseTrackbacks ) {
1071                         $this->addTrackbacks();
1072                 }
1073
1074                 $this->viewUpdates();
1075                 wfProfileOut( __METHOD__ );
1076         }
1077
1078         protected function showLogs() {
1079                 global $wgUser, $wgOut;
1080                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1081                 $pager = new LogPager( $loglist, array('move', 'delete'), false,
1082                         $this->mTitle->getPrefixedText(), '', array( "log_action != 'revision'" ) );
1083                 if( $pager->getNumRows() > 0 ) {
1084                         $pager->mLimit = 10;
1085                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1086                         $wgOut->addWikiMsg( 'moveddeleted-notice' );
1087                         $wgOut->addHTML(
1088                                 $loglist->beginLogEventsList() .
1089                                 $pager->getBody() .
1090                                 $loglist->endLogEventsList()
1091                         );
1092                         if( $pager->getNumRows() > 10 ) {
1093                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1094                                         SpecialPage::getTitleFor( 'Log' ),
1095                                         wfMsgHtml( 'log-fulllog' ),
1096                                         array(),
1097                                         array( 'page' => $this->mTitle->getPrefixedText() )
1098                                 ) );
1099                         }
1100                         $wgOut->addHTML( '</div>' );
1101                 }
1102         }
1103
1104         /*
1105         * Should the parser cache be used?
1106         */
1107         protected function useParserCache( $oldid ) {
1108                 global $wgUser, $wgEnableParserCache;
1109
1110                 return $wgEnableParserCache
1111                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1112                         && $this->exists()
1113                         && empty( $oldid )
1114                         && !$this->mTitle->isCssOrJsPage()
1115                         && !$this->mTitle->isCssJsSubpage();
1116         }
1117
1118         /**
1119          * View redirect
1120          * @param $target Title object or Array of destination(s) to redirect
1121          * @param $appendSubtitle Boolean [optional]
1122          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1123          */
1124         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1125                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1126                 # Display redirect
1127                 if( !is_array( $target ) ) {
1128                         $target = array( $target );
1129                 }
1130                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1131                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1132                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1133                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1134
1135                 if( $appendSubtitle ) {
1136                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1137                 }
1138                 $sk = $wgUser->getSkin();
1139                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1140                 $title = array_shift( $target );
1141                 if( $forceKnown ) {
1142                         $link = $sk->link(
1143                                 $title,
1144                                 htmlspecialchars( $title->getFullText() ),
1145                                 array(),
1146                                 array(),
1147                                 array( 'known', 'noclasses' )
1148                         );
1149                 } else {
1150                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1151                 }
1152                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1153                 foreach( $target as $rt ) {
1154                         if( $forceKnown ) {
1155                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1156                                         . $sk->link(
1157                                                 $rt,
1158                                                 htmlspecialchars( $rt->getFullText() ),
1159                                                 array(),
1160                                                 array(),
1161                                                 array( 'known', 'noclasses' )
1162                                         );
1163                         } else {
1164                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1165                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1166                         }
1167                 }
1168                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1169                         '<span class="redirectText">'.$link.'</span>';
1170
1171         }
1172
1173         public function addTrackbacks() {
1174                 global $wgOut, $wgUser;
1175                 $dbr = wfGetDB( DB_SLAVE );
1176                 $tbs = $dbr->select( 'trackbacks',
1177                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1178                         array('tb_page' => $this->getID() )
1179                 );
1180                 if( !$dbr->numRows($tbs) ) return;
1181
1182                 $tbtext = "";
1183                 while( $o = $dbr->fetchObject($tbs) ) {
1184                         $rmvtxt = "";
1185                         if( $wgUser->isAllowed( 'trackback' ) ) {
1186                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1187                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1188                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1189                         }
1190                         $tbtext .= "\n";
1191                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1192                                         $o->tb_title,
1193                                         $o->tb_url,
1194                                         $o->tb_ex,
1195                                         $o->tb_name,
1196                                         $rmvtxt);
1197                 }
1198                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1199                 $this->mTitle->invalidateCache();
1200         }
1201
1202         public function deletetrackback() {
1203                 global $wgUser, $wgRequest, $wgOut;
1204                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1205                         $wgOut->addWikiMsg( 'sessionfailure' );
1206                         return;
1207                 }
1208
1209                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1210                 if( count($permission_errors) ) {
1211                         $wgOut->showPermissionsErrorPage( $permission_errors );
1212                         return;
1213                 }
1214
1215                 $db = wfGetDB( DB_MASTER );
1216                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1217
1218                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1219                 $this->mTitle->invalidateCache();
1220         }
1221
1222         public function render() {
1223                 global $wgOut;
1224                 $wgOut->setArticleBodyOnly(true);
1225                 $this->view();
1226         }
1227
1228         /**
1229          * Handle action=purge
1230          */
1231         public function purge() {
1232                 global $wgUser, $wgRequest, $wgOut;
1233                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1234                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1235                                 $this->doPurge();
1236                                 $this->view();
1237                         }
1238                 } else {
1239                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1240                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1241                         $form = "<form method=\"post\" action=\"$action\">\n" .
1242                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1243                                         "</form>\n";
1244                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1245                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1246                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1247                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1248                         $wgOut->addHTML( $top . $form . $bottom );
1249                 }
1250         }
1251
1252         /**
1253          * Perform the actions of a page purging
1254          */
1255         public function doPurge() {
1256                 global $wgUseSquid;
1257                 // Invalidate the cache
1258                 $this->mTitle->invalidateCache();
1259
1260                 if( $wgUseSquid ) {
1261                         // Commit the transaction before the purge is sent
1262                         $dbw = wfGetDB( DB_MASTER );
1263                         $dbw->immediateCommit();
1264
1265                         // Send purge
1266                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1267                         $update->doUpdate();
1268                 }
1269                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1270                         global $wgMessageCache;
1271                         if( $this->getID() == 0 ) {
1272                                 $text = false;
1273                         } else {
1274                                 $text = $this->getRawText();
1275                         }
1276                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1277                 }
1278         }
1279
1280         /**
1281          * Insert a new empty page record for this article.
1282          * This *must* be followed up by creating a revision
1283          * and running $this->updateToLatest( $rev_id );
1284          * or else the record will be left in a funky state.
1285          * Best if all done inside a transaction.
1286          *
1287          * @param $dbw Database
1288          * @return int The newly created page_id key, or false if the title already existed
1289          * @private
1290          */
1291         public function insertOn( $dbw ) {
1292                 wfProfileIn( __METHOD__ );
1293
1294                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1295                 $dbw->insert( 'page', array(
1296                         'page_id'           => $page_id,
1297                         'page_namespace'    => $this->mTitle->getNamespace(),
1298                         'page_title'        => $this->mTitle->getDBkey(),
1299                         'page_counter'      => 0,
1300                         'page_restrictions' => '',
1301                         'page_is_redirect'  => 0, # Will set this shortly...
1302                         'page_is_new'       => 1,
1303                         'page_random'       => wfRandom(),
1304                         'page_touched'      => $dbw->timestamp(),
1305                         'page_latest'       => 0, # Fill this in shortly...
1306                         'page_len'          => 0, # Fill this in shortly...
1307                 ), __METHOD__, 'IGNORE' );
1308
1309                 $affected = $dbw->affectedRows();
1310                 if( $affected ) {
1311                         $newid = $dbw->insertId();
1312                         $this->mTitle->resetArticleId( $newid );
1313                 }
1314                 wfProfileOut( __METHOD__ );
1315                 return $affected ? $newid : false;
1316         }
1317
1318         /**
1319          * Update the page record to point to a newly saved revision.
1320          *
1321          * @param $dbw Database object
1322          * @param $revision Revision: For ID number, and text used to set
1323                             length and redirect status fields
1324          * @param $lastRevision Integer: if given, will not overwrite the page field
1325          *                      when different from the currently set value.
1326          *                      Giving 0 indicates the new page flag should be set
1327          *                      on.
1328          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1329          *                                                       removing rows in redirect table.
1330          * @return bool true on success, false on failure
1331          * @private
1332          */
1333         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1334                 wfProfileIn( __METHOD__ );
1335
1336                 $text = $revision->getText();
1337                 $rt = Title::newFromRedirect( $text );
1338
1339                 $conditions = array( 'page_id' => $this->getId() );
1340                 if( !is_null( $lastRevision ) ) {
1341                         # An extra check against threads stepping on each other
1342                         $conditions['page_latest'] = $lastRevision;
1343                 }
1344
1345                 $dbw->update( 'page',
1346                         array( /* SET */
1347                                 'page_latest'      => $revision->getId(),
1348                                 'page_touched'     => $dbw->timestamp(),
1349                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1350                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1351                                 'page_len'         => strlen( $text ),
1352                         ),
1353                         $conditions,
1354                         __METHOD__ );
1355
1356                 $result = $dbw->affectedRows() != 0;
1357                 if( $result ) {
1358                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1359                 }
1360
1361                 wfProfileOut( __METHOD__ );
1362                 return $result;
1363         }
1364
1365         /**
1366          * Add row to the redirect table if this is a redirect, remove otherwise.
1367          *
1368          * @param $dbw Database
1369          * @param $redirectTitle a title object pointing to the redirect target,
1370          *                                               or NULL if this is not a redirect
1371          * @param $lastRevIsRedirect If given, will optimize adding and
1372          *                                                       removing rows in redirect table.
1373          * @return bool true on success, false on failure
1374          * @private
1375          */
1376         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1377                 // Always update redirects (target link might have changed)
1378                 // Update/Insert if we don't know if the last revision was a redirect or not
1379                 // Delete if changing from redirect to non-redirect
1380                 $isRedirect = !is_null($redirectTitle);
1381                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1382                         wfProfileIn( __METHOD__ );
1383                         if( $isRedirect ) {
1384                                 // This title is a redirect, Add/Update row in the redirect table
1385                                 $set = array( /* SET */
1386                                         'rd_namespace' => $redirectTitle->getNamespace(),
1387                                         'rd_title'     => $redirectTitle->getDBkey(),
1388                                         'rd_from'      => $this->getId(),
1389                                 );
1390                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1391                         } else {
1392                                 // This is not a redirect, remove row from redirect table
1393                                 $where = array( 'rd_from' => $this->getId() );
1394                                 $dbw->delete( 'redirect', $where, __METHOD__);
1395                         }
1396                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1397                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1398                         }
1399                         wfProfileOut( __METHOD__ );
1400                         return ( $dbw->affectedRows() != 0 );
1401                 }
1402                 return true;
1403         }
1404
1405         /**
1406          * If the given revision is newer than the currently set page_latest,
1407          * update the page record. Otherwise, do nothing.
1408          *
1409          * @param $dbw Database object
1410          * @param $revision Revision object
1411          */
1412         public function updateIfNewerOn( &$dbw, $revision ) {
1413                 wfProfileIn( __METHOD__ );
1414                 $row = $dbw->selectRow(
1415                         array( 'revision', 'page' ),
1416                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1417                         array(
1418                                 'page_id' => $this->getId(),
1419                                 'page_latest=rev_id' ),
1420                         __METHOD__ );
1421                 if( $row ) {
1422                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1423                                 wfProfileOut( __METHOD__ );
1424                                 return false;
1425                         }
1426                         $prev = $row->rev_id;
1427                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1428                 } else {
1429                         # No or missing previous revision; mark the page as new
1430                         $prev = 0;
1431                         $lastRevIsRedirect = null;
1432                 }
1433                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1434                 wfProfileOut( __METHOD__ );
1435                 return $ret;
1436         }
1437
1438         /**
1439          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1440          * @return string Complete article text, or null if error
1441          */
1442         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1443                 wfProfileIn( __METHOD__ );
1444                 if( strval( $section ) == '' ) {
1445                         // Whole-page edit; let the whole text through
1446                 } else {
1447                         if( is_null($edittime) ) {
1448                                 $rev = Revision::newFromTitle( $this->mTitle );
1449                         } else {
1450                                 $dbw = wfGetDB( DB_MASTER );
1451                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1452                         }
1453                         if( !$rev ) {
1454                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1455                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1456                                 return null;
1457                         }
1458                         $oldtext = $rev->getText();
1459
1460                         if( $section == 'new' ) {
1461                                 # Inserting a new section
1462                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1463                                 $text = strlen( trim( $oldtext ) ) > 0
1464                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1465                                                 : "{$subject}{$text}";
1466                         } else {
1467                                 # Replacing an existing section; roll out the big guns
1468                                 global $wgParser;
1469                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1470                         }
1471                 }
1472                 wfProfileOut( __METHOD__ );
1473                 return $text;
1474         }
1475
1476         /**
1477          * This function is not deprecated until somebody fixes the core not to use
1478          * it. Nevertheless, use Article::doEdit() instead.
1479          */
1480         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1481                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1482                         ( $isminor ? EDIT_MINOR : 0 ) |
1483                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1484                         ( $bot ? EDIT_FORCE_BOT : 0 );
1485
1486                 # If this is a comment, add the summary as headline
1487                 if( $comment && $summary != "" ) {
1488                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1489                 }
1490
1491                 $this->doEdit( $text, $summary, $flags );
1492
1493                 $dbw = wfGetDB( DB_MASTER );
1494                 if($watchthis) {
1495                         if(!$this->mTitle->userIsWatching()) {
1496                                 $dbw->begin();
1497                                 $this->doWatch();
1498                                 $dbw->commit();
1499                         }
1500                 } else {
1501                         if( $this->mTitle->userIsWatching() ) {
1502                                 $dbw->begin();
1503                                 $this->doUnwatch();
1504                                 $dbw->commit();
1505                         }
1506                 }
1507                 $this->doRedirect( $this->isRedirect( $text ) );
1508         }
1509
1510         /**
1511          * @deprecated use Article::doEdit()
1512          */
1513         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1514                 wfDeprecated( __METHOD__ );
1515                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1516                         ( $minor ? EDIT_MINOR : 0 ) |
1517                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1518
1519                 $status = $this->doEdit( $text, $summary, $flags );
1520                 if( !$status->isOK() ) {
1521                         return false;
1522                 }
1523
1524                 $dbw = wfGetDB( DB_MASTER );
1525                 if( $watchthis ) {
1526                         if(!$this->mTitle->userIsWatching()) {
1527                                 $dbw->begin();
1528                                 $this->doWatch();
1529                                 $dbw->commit();
1530                         }
1531                 } else {
1532                         if( $this->mTitle->userIsWatching() ) {
1533                                 $dbw->begin();
1534                                 $this->doUnwatch();
1535                                 $dbw->commit();
1536                         }
1537                 }
1538
1539                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1540                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1541
1542                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1543                 return true;
1544         }
1545
1546         /**
1547          * Article::doEdit()
1548          *
1549          * Change an existing article or create a new article. Updates RC and all necessary caches,
1550          * optionally via the deferred update array.
1551          *
1552          * $wgUser must be set before calling this function.
1553          *
1554          * @param $text String: new text
1555          * @param $summary String: edit summary
1556          * @param $flags Integer bitfield:
1557          *      EDIT_NEW
1558          *          Article is known or assumed to be non-existent, create a new one
1559          *      EDIT_UPDATE
1560          *          Article is known or assumed to be pre-existing, update it
1561          *      EDIT_MINOR
1562          *          Mark this edit minor, if the user is allowed to do so
1563          *      EDIT_SUPPRESS_RC
1564          *          Do not log the change in recentchanges
1565          *      EDIT_FORCE_BOT
1566          *          Mark the edit a "bot" edit regardless of user rights
1567          *      EDIT_DEFER_UPDATES
1568          *          Defer some of the updates until the end of index.php
1569          *      EDIT_AUTOSUMMARY
1570          *          Fill in blank summaries with generated text where possible
1571          *
1572          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1573          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1574          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1575          * edit-already-exists error will be returned. These two conditions are also possible with
1576          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1577          *
1578          * @param $baseRevId the revision ID this edit was based off, if any
1579          * @param $user Optional user object, $wgUser will be used if not passed
1580          *
1581          * @return Status object. Possible errors:
1582          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1583          *     edit-gone-missing:       In update mode, but the article didn't exist
1584          *     edit-conflict:           In update mode, the article changed unexpectedly
1585          *     edit-no-change:          Warning that the text was the same as before
1586          *     edit-already-exists:     In creation mode, but the article already exists
1587          *
1588          *  Extensions may define additional errors.
1589          *
1590          *  $return->value will contain an associative array with members as follows:
1591          *     new:                     Boolean indicating if the function attempted to create a new article
1592          *     revision:                The revision object for the inserted revision, or null
1593          *
1594          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1595          */
1596         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1597                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1598
1599                 # Low-level sanity check
1600                 if( $this->mTitle->getText() == '' ) {
1601                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1602                 }
1603
1604                 wfProfileIn( __METHOD__ );
1605
1606                 $user = is_null($user) ? $wgUser : $user;
1607                 $status = Status::newGood( array() );
1608
1609                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1610                 $this->loadPageData();
1611
1612                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1613                         $aid = $this->mTitle->getArticleID();
1614                         if( $aid ) {
1615                                 $flags |= EDIT_UPDATE;
1616                         } else {
1617                                 $flags |= EDIT_NEW;
1618                         }
1619                 }
1620
1621                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1622                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1623                 {
1624                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1625                         wfProfileOut( __METHOD__ );
1626                         if( $status->isOK() ) {
1627                                 $status->fatal( 'edit-hook-aborted');
1628                         }
1629                         return $status;
1630                 }
1631
1632                 # Silently ignore EDIT_MINOR if not allowed
1633                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1634                 $bot = $flags & EDIT_FORCE_BOT;
1635
1636                 $oldtext = $this->getRawText(); // current revision
1637                 $oldsize = strlen( $oldtext );
1638
1639                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1640                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1641                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1642                 }
1643
1644                 $editInfo = $this->prepareTextForEdit( $text );
1645                 $text = $editInfo->pst;
1646                 $newsize = strlen( $text );
1647
1648                 $dbw = wfGetDB( DB_MASTER );
1649                 $now = wfTimestampNow();
1650
1651                 if( $flags & EDIT_UPDATE ) {
1652                         # Update article, but only if changed.
1653                         $status->value['new'] = false;
1654                         # Make sure the revision is either completely inserted or not inserted at all
1655                         if( !$wgDBtransactions ) {
1656                                 $userAbort = ignore_user_abort( true );
1657                         }
1658
1659                         $revisionId = 0;
1660
1661                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1662
1663                         if( $changed ) {
1664                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1665                                   - (int)$this->isCountable( $oldtext );
1666                                 $this->mTotalAdjustment = 0;
1667
1668                                 if( !$this->mLatest ) {
1669                                         # Article gone missing
1670                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1671                                         $status->fatal( 'edit-gone-missing' );
1672                                         wfProfileOut( __METHOD__ );
1673                                         return $status;
1674                                 }
1675
1676                                 $revision = new Revision( array(
1677                                         'page'       => $this->getId(),
1678                                         'comment'    => $summary,
1679                                         'minor_edit' => $isminor,
1680                                         'text'       => $text,
1681                                         'parent_id'  => $this->mLatest,
1682                                         'user'       => $user->getId(),
1683                                         'user_text'  => $user->getName(),
1684                                         ) );
1685
1686                                 $dbw->begin();
1687                                 $revisionId = $revision->insertOn( $dbw );
1688
1689                                 # Update page
1690                                 #
1691                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1692                                 # during the course of this function. This makes sure that EditPage can detect
1693                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1694                                 # before this function is called. A previous function used a separate query, this
1695                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1696                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1697
1698                                 if( !$ok ) {
1699                                         /* Belated edit conflict! Run away!! */
1700                                         $status->fatal( 'edit-conflict' );
1701                                         # Delete the invalid revision if the DB is not transactional
1702                                         if( !$wgDBtransactions ) {
1703                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1704                                         }
1705                                         $revisionId = 0;
1706                                         $dbw->rollback();
1707                                 } else {
1708                                         global $wgUseRCPatrol;
1709                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1710                                         # Update recentchanges
1711                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1712                                                 # Mark as patrolled if the user can do so
1713                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1714                                                 # Add RC row to the DB
1715                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1716                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1717                                                         $revisionId, $patrolled
1718                                                 );
1719                                                 # Log auto-patrolled edits
1720                                                 if( $patrolled ) {
1721                                                         PatrolLog::record( $rc, true );
1722                                                 }
1723                                         }
1724                                         $user->incEditCount();
1725                                         $dbw->commit();
1726                                 }
1727                         } else {
1728                                 $status->warning( 'edit-no-change' );
1729                                 $revision = null;
1730                                 // Keep the same revision ID, but do some updates on it
1731                                 $revisionId = $this->getRevIdFetched();
1732                                 // Update page_touched, this is usually implicit in the page update
1733                                 // Other cache updates are done in onArticleEdit()
1734                                 $this->mTitle->invalidateCache();
1735                         }
1736
1737                         if( !$wgDBtransactions ) {
1738                                 ignore_user_abort( $userAbort );
1739                         }
1740                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1741                         if( !$status->isOK() ) {
1742                                 wfProfileOut( __METHOD__ );
1743                                 return $status;
1744                         }
1745
1746                         # Invalidate cache of this article and all pages using this article
1747                         # as a template. Partly deferred.
1748                         Article::onArticleEdit( $this->mTitle );
1749                         # Update links tables, site stats, etc.
1750                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1751                 } else {
1752                         # Create new article
1753                         $status->value['new'] = true;
1754
1755                         # Set statistics members
1756                         # We work out if it's countable after PST to avoid counter drift
1757                         # when articles are created with {{subst:}}
1758                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1759                         $this->mTotalAdjustment = 1;
1760
1761                         $dbw->begin();
1762
1763                         # Add the page record; stake our claim on this title!
1764                         # This will return false if the article already exists
1765                         $newid = $this->insertOn( $dbw );
1766
1767                         if( $newid === false ) {
1768                                 $dbw->rollback();
1769                                 $status->fatal( 'edit-already-exists' );
1770                                 wfProfileOut( __METHOD__ );
1771                                 return $status;
1772                         }
1773
1774                         # Save the revision text...
1775                         $revision = new Revision( array(
1776                                 'page'       => $newid,
1777                                 'comment'    => $summary,
1778                                 'minor_edit' => $isminor,
1779                                 'text'       => $text,
1780                                 'user'       => $user->getId(),
1781                                 'user_text'  => $user->getName(),
1782                                 ) );
1783                         $revisionId = $revision->insertOn( $dbw );
1784
1785                         $this->mTitle->resetArticleID( $newid );
1786
1787                         # Update the page record with revision data
1788                         $this->updateRevisionOn( $dbw, $revision, 0 );
1789
1790                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1791                         # Update recentchanges
1792                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1793                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1794                                 # Mark as patrolled if the user can do so
1795                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1796                                 # Add RC row to the DB
1797                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1798                                         '', strlen($text), $revisionId, $patrolled );
1799                                 # Log auto-patrolled edits
1800                                 if( $patrolled ) {
1801                                         PatrolLog::record( $rc, true );
1802                                 }
1803                         }
1804                         $user->incEditCount();
1805                         $dbw->commit();
1806
1807                         # Update links, etc.
1808                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1809
1810                         # Clear caches
1811                         Article::onArticleCreate( $this->mTitle );
1812
1813                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1814                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1815                 }
1816
1817                 # Do updates right now unless deferral was requested
1818                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1819                         wfDoUpdates();
1820                 }
1821
1822                 // Return the new revision (or null) to the caller
1823                 $status->value['revision'] = $revision;
1824
1825                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1826                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1827
1828                 wfProfileOut( __METHOD__ );
1829                 return $status;
1830         }
1831
1832         /**
1833          * @deprecated wrapper for doRedirect
1834          */
1835         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1836                 wfDeprecated( __METHOD__ );
1837                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1838         }
1839
1840         /**
1841          * Output a redirect back to the article.
1842          * This is typically used after an edit.
1843          *
1844          * @param $noRedir Boolean: add redirect=no
1845          * @param $sectionAnchor String: section to redirect to, including "#"
1846          * @param $extraQuery String: extra query params
1847          */
1848         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1849                 global $wgOut;
1850                 if( $noRedir ) {
1851                         $query = 'redirect=no';
1852                         if( $extraQuery )
1853                                 $query .= "&$query";
1854                 } else {
1855                         $query = $extraQuery;
1856                 }
1857                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1858         }
1859
1860         /**
1861          * Mark this particular edit/page as patrolled
1862          */
1863         public function markpatrolled() {
1864                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1865                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1866
1867                 # If we haven't been given an rc_id value, we can't do anything
1868                 $rcid = (int) $wgRequest->getVal('rcid');
1869                 $rc = RecentChange::newFromId($rcid);
1870                 if( is_null($rc) ) {
1871                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1872                         return;
1873                 }
1874
1875                 #It would be nice to see where the user had actually come from, but for now just guess
1876                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1877                 $return = SpecialPage::getTitleFor( $returnto );
1878
1879                 $dbw = wfGetDB( DB_MASTER );
1880                 $errors = $rc->doMarkPatrolled();
1881
1882                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1883                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1884                         return;
1885                 }
1886
1887                 if( in_array(array('hookaborted'), $errors) ) {
1888                         // The hook itself has handled any output
1889                         return;
1890                 }
1891
1892                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1893                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1894                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1895                         $wgOut->returnToMain( false, $return );
1896                         return;
1897                 }
1898
1899                 if( !empty($errors) ) {
1900                         $wgOut->showPermissionsErrorPage( $errors );
1901                         return;
1902                 }
1903
1904                 # Inform the user
1905                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1906                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1907                 $wgOut->returnToMain( false, $return );
1908         }
1909
1910         /**
1911          * User-interface handler for the "watch" action
1912          */
1913
1914         public function watch() {
1915                 global $wgUser, $wgOut;
1916                 if( $wgUser->isAnon() ) {
1917                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1918                         return;
1919                 }
1920                 if( wfReadOnly() ) {
1921                         $wgOut->readOnlyPage();
1922                         return;
1923                 }
1924                 if( $this->doWatch() ) {
1925                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1926                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1927                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1928                 }
1929                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1930         }
1931
1932         /**
1933          * Add this page to $wgUser's watchlist
1934          * @return bool true on successful watch operation
1935          */
1936         public function doWatch() {
1937                 global $wgUser;
1938                 if( $wgUser->isAnon() ) {
1939                         return false;
1940                 }
1941                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1942                         $wgUser->addWatch( $this->mTitle );
1943                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1944                 }
1945                 return false;
1946         }
1947
1948         /**
1949          * User interface handler for the "unwatch" action.
1950          */
1951         public function unwatch() {
1952                 global $wgUser, $wgOut;
1953                 if( $wgUser->isAnon() ) {
1954                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1955                         return;
1956                 }
1957                 if( wfReadOnly() ) {
1958                         $wgOut->readOnlyPage();
1959                         return;
1960                 }
1961                 if( $this->doUnwatch() ) {
1962                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1963                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1964                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1965                 }
1966                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1967         }
1968
1969         /**
1970          * Stop watching a page
1971          * @return bool true on successful unwatch
1972          */
1973         public function doUnwatch() {
1974                 global $wgUser;
1975                 if( $wgUser->isAnon() ) {
1976                         return false;
1977                 }
1978                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1979                         $wgUser->removeWatch( $this->mTitle );
1980                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1981                 }
1982                 return false;
1983         }
1984
1985         /**
1986          * action=protect handler
1987          */
1988         public function protect() {
1989                 $form = new ProtectionForm( $this );
1990                 $form->execute();
1991         }
1992
1993         /**
1994          * action=unprotect handler (alias)
1995          */
1996         public function unprotect() {
1997                 $this->protect();
1998         }
1999
2000         /**
2001          * Update the article's restriction field, and leave a log entry.
2002          *
2003          * @param $limit Array: set of restriction keys
2004          * @param $reason String
2005          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2006          * @param $expiry Array: per restriction type expiration
2007          * @return bool true on success
2008          */
2009         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2010                 global $wgUser, $wgRestrictionTypes, $wgContLang;
2011
2012                 $id = $this->mTitle->getArticleID();
2013                 if ( $id <= 0 ) {
2014                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2015                         return false;
2016                 }
2017
2018                 if ( wfReadOnly() ) {
2019                         wfDebug( "updateRestrictions failed: read-only\n" );
2020                         return false;
2021                 }
2022
2023                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2024                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2025                         return false;
2026                 }
2027
2028                 if( !$cascade ) {
2029                         $cascade = false;
2030                 }
2031
2032                 // Take this opportunity to purge out expired restrictions
2033                 Title::purgeExpiredRestrictions();
2034
2035                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2036                 # we expect a single selection, but the schema allows otherwise.
2037                 $current = array();
2038                 $updated = Article::flattenRestrictions( $limit );
2039                 $changed = false;
2040                 foreach( $wgRestrictionTypes as $action ) {
2041                         if( isset( $expiry[$action] ) ) {
2042                                 # Get current restrictions on $action
2043                                 $aLimits = $this->mTitle->getRestrictions( $action );
2044                                 $current[$action] = implode( '', $aLimits );
2045                                 # Are any actual restrictions being dealt with here?
2046                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
2047                                 # If something changed, we need to log it. Checking $aRChanged
2048                                 # assures that "unprotecting" a page that is not protected does
2049                                 # not log just because the expiry was "changed".
2050                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2051                                         $changed = true;
2052                                 }
2053                         }
2054                 }
2055
2056                 $current = Article::flattenRestrictions( $current );
2057
2058                 $changed = ($changed || $current != $updated );
2059                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
2060                 $protect = ( $updated != '' );
2061
2062                 # If nothing's changed, do nothing
2063                 if( $changed ) {
2064                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2065
2066                                 $dbw = wfGetDB( DB_MASTER );
2067
2068                                 # Prepare a null revision to be added to the history
2069                                 $modified = $current != '' && $protect;
2070                                 if( $protect ) {
2071                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2072                                 } else {
2073                                         $comment_type = 'unprotectedarticle';
2074                                 }
2075                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2076
2077                                 # Only restrictions with the 'protect' right can cascade...
2078                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2079                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2080                                 # The schema allows multiple restrictions
2081                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2082                                         $cascade = false;
2083                                 $cascade_description = '';
2084                                 if( $cascade ) {
2085                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2086                                 }
2087
2088                                 if( $reason )
2089                                         $comment .= ": $reason";
2090
2091                                 $editComment = $comment;
2092                                 $encodedExpiry = array();
2093                                 $protect_description = '';
2094                                 foreach( $limit as $action => $restrictions  ) {
2095                                         if ( !isset($expiry[$action]) )
2096                                                 $expiry[$action] = 'infinite';
2097
2098                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2099                                         if( $restrictions != '' ) {
2100                                                 $protect_description .= "[$action=$restrictions] (";
2101                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2102                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2103                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2104                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2105                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2106                                                 } else {
2107                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2108                                                 }
2109                                                 $protect_description .= ') ';
2110                                         }
2111                                 }
2112                                 $protect_description = trim($protect_description);
2113
2114                                 if( $protect_description && $protect )
2115                                         $editComment .= " ($protect_description)";
2116                                 if( $cascade )
2117                                         $editComment .= "$cascade_description";
2118                                 # Update restrictions table
2119                                 foreach( $limit as $action => $restrictions ) {
2120                                         if($restrictions != '' ) {
2121                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2122                                                         array( 'pr_page' => $id,
2123                                                                 'pr_type' => $action,
2124                                                                 'pr_level' => $restrictions,
2125                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2126                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2127                                         } else {
2128                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2129                                                         'pr_type' => $action ), __METHOD__ );
2130                                         }
2131                                 }
2132
2133                                 # Insert a null revision
2134                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2135                                 $nullRevId = $nullRevision->insertOn( $dbw );
2136
2137                                 $latest = $this->getLatest();
2138                                 # Update page record
2139                                 $dbw->update( 'page',
2140                                         array( /* SET */
2141                                                 'page_touched' => $dbw->timestamp(),
2142                                                 'page_restrictions' => '',
2143                                                 'page_latest' => $nullRevId
2144                                         ), array( /* WHERE */
2145                                                 'page_id' => $id
2146                                         ), 'Article::protect'
2147                                 );
2148
2149                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2150                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2151
2152                                 # Update the protection log
2153                                 $log = new LogPage( 'protect' );
2154                                 if( $protect ) {
2155                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2156                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2157                                 } else {
2158                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2159                                 }
2160
2161                         } # End hook
2162                 } # End "changed" check
2163
2164                 return true;
2165         }
2166
2167         /**
2168          * Take an array of page restrictions and flatten it to a string
2169          * suitable for insertion into the page_restrictions field.
2170          * @param $limit Array
2171          * @return String
2172          */
2173         protected static function flattenRestrictions( $limit ) {
2174                 if( !is_array( $limit ) ) {
2175                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2176                 }
2177                 $bits = array();
2178                 ksort( $limit );
2179                 foreach( $limit as $action => $restrictions ) {
2180                         if( $restrictions != '' ) {
2181                                 $bits[] = "$action=$restrictions";
2182                         }
2183                 }
2184                 return implode( ':', $bits );
2185         }
2186
2187         /**
2188          * Auto-generates a deletion reason
2189          * @param &$hasHistory Boolean: whether the page has a history
2190          */
2191         public function generateReason( &$hasHistory ) {
2192                 global $wgContLang;
2193                 $dbw = wfGetDB( DB_MASTER );
2194                 // Get the last revision
2195                 $rev = Revision::newFromTitle( $this->mTitle );
2196                 if( is_null( $rev ) )
2197                         return false;
2198
2199                 // Get the article's contents
2200                 $contents = $rev->getText();
2201                 $blank = false;
2202                 // If the page is blank, use the text from the previous revision,
2203                 // which can only be blank if there's a move/import/protect dummy revision involved
2204                 if( $contents == '' ) {
2205                         $prev = $rev->getPrevious();
2206                         if( $prev )     {
2207                                 $contents = $prev->getText();
2208                                 $blank = true;
2209                         }
2210                 }
2211
2212                 // Find out if there was only one contributor
2213                 // Only scan the last 20 revisions
2214                 $res = $dbw->select( 'revision', 'rev_user_text',
2215                         array( 'rev_page' => $this->getID(), $dbw->bitAnd('rev_deleted', Revision::DELETED_USER) . ' = 0' ),
2216                         __METHOD__,
2217                         array( 'LIMIT' => 20 )
2218                 );
2219                 if( $res === false )
2220                         // This page has no revisions, which is very weird
2221                         return false;
2222
2223                 $hasHistory = ( $res->numRows() > 1 );
2224                 $row = $dbw->fetchObject( $res );
2225                 $onlyAuthor = $row->rev_user_text;
2226                 // Try to find a second contributor
2227                 foreach( $res as $row ) {
2228                         if( $row->rev_user_text != $onlyAuthor ) {
2229                                 $onlyAuthor = false;
2230                                 break;
2231                         }
2232                 }
2233                 $dbw->freeResult( $res );
2234
2235                 // Generate the summary with a '$1' placeholder
2236                 if( $blank ) {
2237                         // The current revision is blank and the one before is also
2238                         // blank. It's just not our lucky day
2239                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2240                 } else {
2241                         if( $onlyAuthor )
2242                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2243                         else
2244                                 $reason = wfMsgForContent( 'excontent', '$1' );
2245                 }
2246
2247                 if( $reason == '-' ) {
2248                         // Allow these UI messages to be blanked out cleanly
2249                         return '';
2250                 }
2251
2252                 // Replace newlines with spaces to prevent uglyness
2253                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2254                 // Calculate the maximum amount of chars to get
2255                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2256                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2257                 $contents = $wgContLang->truncate( $contents, $maxLength );
2258                 // Remove possible unfinished links
2259                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2260                 // Now replace the '$1' placeholder
2261                 $reason = str_replace( '$1', $contents, $reason );
2262                 return $reason;
2263         }
2264
2265
2266         /*
2267          * UI entry point for page deletion
2268          */
2269         public function delete() {
2270                 global $wgUser, $wgOut, $wgRequest;
2271
2272                 $confirm = $wgRequest->wasPosted() &&
2273                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2274
2275                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2276                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2277
2278                 $reason = $this->DeleteReasonList;
2279
2280                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2281                         // Entry from drop down menu + additional comment
2282                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2283                 } elseif( $reason == 'other' ) {
2284                         $reason = $this->DeleteReason;
2285                 }
2286                 # Flag to hide all contents of the archived revisions
2287                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2288
2289                 # This code desperately needs to be totally rewritten
2290
2291                 # Read-only check...
2292                 if( wfReadOnly() ) {
2293                         $wgOut->readOnlyPage();
2294                         return;
2295                 }
2296
2297                 # Check permissions
2298                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2299
2300                 if( count( $permission_errors ) > 0 ) {
2301                         $wgOut->showPermissionsErrorPage( $permission_errors );
2302                         return;
2303                 }
2304
2305                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2306
2307                 # Better double-check that it hasn't been deleted yet!
2308                 $dbw = wfGetDB( DB_MASTER );
2309                 $conds = $this->mTitle->pageCond();
2310                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2311                 if( $latest === false ) {
2312                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2313                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2314                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2315                         return;
2316                 }
2317
2318                 # Hack for big sites
2319                 $bigHistory = $this->isBigDeletion();
2320                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2321                         global $wgLang, $wgDeleteRevisionsLimit;
2322                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2323                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2324                         return;
2325                 }
2326
2327                 if( $confirm ) {
2328                         $this->doDelete( $reason, $suppress );
2329                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2330                                 $this->doWatch();
2331                         } elseif( $this->mTitle->userIsWatching() ) {
2332                                 $this->doUnwatch();
2333                         }
2334                         return;
2335                 }
2336
2337                 // Generate deletion reason
2338                 $hasHistory = false;
2339                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2340
2341                 // If the page has a history, insert a warning
2342                 if( $hasHistory && !$confirm ) {
2343                         $skin = $wgUser->getSkin();
2344                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2345                         if( $bigHistory ) {
2346                                 global $wgLang, $wgDeleteRevisionsLimit;
2347                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2348                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2349                         }
2350                 }
2351
2352                 return $this->confirmDelete( $reason );
2353         }
2354
2355         /**
2356          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2357          */
2358         public function isBigDeletion() {
2359                 global $wgDeleteRevisionsLimit;
2360                 if( $wgDeleteRevisionsLimit ) {
2361                         $revCount = $this->estimateRevisionCount();
2362                         return $revCount > $wgDeleteRevisionsLimit;
2363                 }
2364                 return false;
2365         }
2366
2367         /**
2368          * @return int approximate revision count
2369          */
2370         public function estimateRevisionCount() {
2371                 $dbr = wfGetDB( DB_SLAVE );
2372                 // For an exact count...
2373                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2374                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2375                 return $dbr->estimateRowCount( 'revision', '*',
2376                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2377         }
2378
2379         /**
2380          * Get the last N authors
2381          * @param $num Integer: number of revisions to get
2382          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2383          * @return array Array of authors, duplicates not removed
2384          */
2385         public function getLastNAuthors( $num, $revLatest = 0 ) {
2386                 wfProfileIn( __METHOD__ );
2387                 // First try the slave
2388                 // If that doesn't have the latest revision, try the master
2389                 $continue = 2;
2390                 $db = wfGetDB( DB_SLAVE );
2391                 do {
2392                         $res = $db->select( array( 'page', 'revision' ),
2393                                 array( 'rev_id', 'rev_user_text' ),
2394                                 array(
2395                                         'page_namespace' => $this->mTitle->getNamespace(),
2396                                         'page_title' => $this->mTitle->getDBkey(),
2397                                         'rev_page = page_id'
2398                                 ), __METHOD__, $this->getSelectOptions( array(
2399                                         'ORDER BY' => 'rev_timestamp DESC',
2400                                         'LIMIT' => $num
2401                                 ) )
2402                         );
2403                         if( !$res ) {
2404                                 wfProfileOut( __METHOD__ );
2405                                 return array();
2406                         }
2407                         $row = $db->fetchObject( $res );
2408                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2409                                 $db = wfGetDB( DB_MASTER );
2410                                 $continue--;
2411                         } else {
2412                                 $continue = 0;
2413                         }
2414                 } while ( $continue );
2415
2416                 $authors = array( $row->rev_user_text );
2417                 while ( $row = $db->fetchObject( $res ) ) {
2418                         $authors[] = $row->rev_user_text;
2419                 }
2420                 wfProfileOut( __METHOD__ );
2421                 return $authors;
2422         }
2423
2424         /**
2425          * Output deletion confirmation dialog
2426          * @param $reason String: prefilled reason
2427          */
2428         public function confirmDelete( $reason ) {
2429                 global $wgOut, $wgUser;
2430
2431                 wfDebug( "Article::confirmDelete\n" );
2432
2433                 $deleteBackLink = $wgUser->getSkin()->link(
2434                         $this->mTitle,
2435                         null,
2436                         array(),
2437                         array(),
2438                         array( 'known', 'noclasses' )
2439                 );
2440                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2441                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2442                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2443
2444                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2445                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2446                                         <td></td>
2447                                         <td class='mw-input'><strong>" .
2448                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2449                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2450                                         "</strong></td>
2451                                 </tr>";
2452                 } else {
2453                         $suppress = '';
2454                 }
2455                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2456
2457                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2458                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2459                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2460                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2461                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2462                         "<tr id=\"wpDeleteReasonListRow\">
2463                                 <td class='mw-label'>" .
2464                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2465                                 "</td>
2466                                 <td class='mw-input'>" .
2467                                         Xml::listDropDown( 'wpDeleteReasonList',
2468                                                 wfMsgForContent( 'deletereason-dropdown' ),
2469                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2470                                 "</td>
2471                         </tr>
2472                         <tr id=\"wpDeleteReasonRow\">
2473                                 <td class='mw-label'>" .
2474                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2475                                 "</td>
2476                                 <td class='mw-input'>" .
2477                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2478                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2479                                 "</td>
2480                         </tr>
2481                         <tr>
2482                                 <td></td>
2483                                 <td class='mw-input'>" .
2484                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2485                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2486                                 "</td>
2487                         </tr>
2488                         $suppress
2489                         <tr>
2490                                 <td></td>
2491                                 <td class='mw-submit'>" .
2492                                         Xml::submitButton( wfMsg( 'deletepage' ),
2493                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2494                                 "</td>
2495                         </tr>" .
2496                         Xml::closeElement( 'table' ) .
2497                         Xml::closeElement( 'fieldset' ) .
2498                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2499                         Xml::closeElement( 'form' );
2500
2501                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2502                                 $skin = $wgUser->getSkin();
2503                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2504                                 $link = $skin->link(
2505                                         $title,
2506                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2507                                         array(),
2508                                         array( 'action' => 'edit' )
2509                                 );
2510                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2511                         }
2512
2513                 $wgOut->addHTML( $form );
2514                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2515         }
2516
2517         /**
2518          * Perform a deletion and output success or failure messages
2519          */
2520         public function doDelete( $reason, $suppress = false ) {
2521                 global $wgOut, $wgUser;
2522                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2523
2524                 $error = '';
2525                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2526                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2527                                 $deleted = $this->mTitle->getPrefixedText();
2528
2529                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2530                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2531
2532                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2533
2534                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2535                                 $wgOut->returnToMain( false );
2536                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2537                         } else {
2538                                 if( $error == '' ) {
2539                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2540                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2541                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2542                                 } else {
2543                                         $wgOut->showFatalError( $error );
2544                                 }
2545                         }
2546                 }
2547         }
2548
2549         /**
2550          * Back-end article deletion
2551          * Deletes the article with database consistency, writes logs, purges caches
2552          * Returns success
2553          */
2554         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2555                 global $wgUseSquid, $wgDeferredUpdateList;
2556                 global $wgUseTrackbacks;
2557
2558                 wfDebug( __METHOD__."\n" );
2559
2560                 $dbw = wfGetDB( DB_MASTER );
2561                 $ns = $this->mTitle->getNamespace();
2562                 $t = $this->mTitle->getDBkey();
2563                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2564
2565                 if( $t == '' || $id == 0 ) {
2566                         return false;
2567                 }
2568
2569                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2570                 array_push( $wgDeferredUpdateList, $u );
2571
2572                 // Bitfields to further suppress the content
2573                 if( $suppress ) {
2574                         $bitfield = 0;
2575                         // This should be 15...
2576                         $bitfield |= Revision::DELETED_TEXT;
2577                         $bitfield |= Revision::DELETED_COMMENT;
2578                         $bitfield |= Revision::DELETED_USER;
2579                         $bitfield |= Revision::DELETED_RESTRICTED;
2580                 } else {
2581                         $bitfield = 'rev_deleted';
2582                 }
2583
2584                 $dbw->begin();
2585                 // For now, shunt the revision data into the archive table.
2586                 // Text is *not* removed from the text table; bulk storage
2587                 // is left intact to avoid breaking block-compression or
2588                 // immutable storage schemes.
2589                 //
2590                 // For backwards compatibility, note that some older archive
2591                 // table entries will have ar_text and ar_flags fields still.
2592                 //
2593                 // In the future, we may keep revisions and mark them with
2594                 // the rev_deleted field, which is reserved for this purpose.
2595                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2596                         array(
2597                                 'ar_namespace'  => 'page_namespace',
2598                                 'ar_title'      => 'page_title',
2599                                 'ar_comment'    => 'rev_comment',
2600                                 'ar_user'       => 'rev_user',
2601                                 'ar_user_text'  => 'rev_user_text',
2602                                 'ar_timestamp'  => 'rev_timestamp',
2603                                 'ar_minor_edit' => 'rev_minor_edit',
2604                                 'ar_rev_id'     => 'rev_id',
2605                                 'ar_text_id'    => 'rev_text_id',
2606                                 'ar_text'       => '\'\'', // Be explicit to appease
2607                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2608                                 'ar_len'        => 'rev_len',
2609                                 'ar_page_id'    => 'page_id',
2610                                 'ar_deleted'    => $bitfield
2611                         ), array(
2612                                 'page_id' => $id,
2613                                 'page_id = rev_page'
2614                         ), __METHOD__
2615                 );
2616
2617                 # Delete restrictions for it
2618                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2619
2620                 # Now that it's safely backed up, delete it
2621                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2622                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2623                 if( !$ok ) {
2624                         $dbw->rollback();
2625                         return false;
2626                 }
2627
2628                 # Fix category table counts
2629                 $cats = array();
2630                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2631                 foreach( $res as $row ) {
2632                         $cats []= $row->cl_to;
2633                 }
2634                 $this->updateCategoryCounts( array(), $cats );
2635
2636                 # If using cascading deletes, we can skip some explicit deletes
2637                 if( !$dbw->cascadingDeletes() ) {
2638                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2639
2640                         if($wgUseTrackbacks)
2641                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2642
2643                         # Delete outgoing links
2644                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2645                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2646                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2647                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2648                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2649                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2650                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2651                 }
2652
2653                 # If using cleanup triggers, we can skip some manual deletes
2654                 if( !$dbw->cleanupTriggers() ) {
2655                         # Clean up recentchanges entries...
2656                         $dbw->delete( 'recentchanges',
2657                                 array( 'rc_type != '.RC_LOG,
2658                                         'rc_namespace' => $this->mTitle->getNamespace(),
2659                                         'rc_title' => $this->mTitle->getDBkey() ),
2660                                 __METHOD__ );
2661                         $dbw->delete( 'recentchanges',
2662                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2663                                 __METHOD__ );
2664                 }
2665
2666                 # Clear caches
2667                 Article::onArticleDelete( $this->mTitle );
2668
2669                 # Clear the cached article id so the interface doesn't act like we exist
2670                 $this->mTitle->resetArticleID( 0 );
2671
2672                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2673                 $logtype = $suppress ? 'suppress' : 'delete';
2674                 $log = new LogPage( $logtype );
2675
2676                 # Make sure logging got through
2677                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2678
2679                 $dbw->commit();
2680
2681                 return true;
2682         }
2683
2684         /**
2685          * Roll back the most recent consecutive set of edits to a page
2686          * from the same user; fails if there are no eligible edits to
2687          * roll back to, e.g. user is the sole contributor. This function
2688          * performs permissions checks on $wgUser, then calls commitRollback()
2689          * to do the dirty work
2690          *
2691          * @param $fromP String: Name of the user whose edits to rollback.
2692          * @param $summary String: Custom summary. Set to default summary if empty.
2693          * @param $token String: Rollback token.
2694          * @param $bot Boolean: If true, mark all reverted edits as bot.
2695          *
2696          * @param $resultDetails Array: contains result-specific array of additional values
2697          *    'alreadyrolled' : 'current' (rev)
2698          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2699          *
2700          * @return array of errors, each error formatted as
2701          *   array(messagekey, param1, param2, ...).
2702          * On success, the array is empty.  This array can also be passed to
2703          * OutputPage::showPermissionsErrorPage().
2704          */
2705         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2706                 global $wgUser;
2707                 $resultDetails = null;
2708
2709                 # Check permissions
2710                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2711                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2712                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2713
2714                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2715                         $errors[] = array( 'sessionfailure' );
2716
2717                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2718                         $errors[] = array( 'actionthrottledtext' );
2719                 }
2720                 # If there were errors, bail out now
2721                 if( !empty( $errors ) )
2722                         return $errors;
2723
2724                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2725         }
2726
2727         /**
2728          * Backend implementation of doRollback(), please refer there for parameter
2729          * and return value documentation
2730          *
2731          * NOTE: This function does NOT check ANY permissions, it just commits the
2732          * rollback to the DB Therefore, you should only call this function direct-
2733          * ly if you want to use custom permissions checks. If you don't, use
2734          * doRollback() instead.
2735          */
2736         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2737                 global $wgUseRCPatrol, $wgUser, $wgLang;
2738                 $dbw = wfGetDB( DB_MASTER );
2739
2740                 if( wfReadOnly() ) {
2741                         return array( array( 'readonlytext' ) );
2742                 }
2743
2744                 # Get the last editor
2745                 $current = Revision::newFromTitle( $this->mTitle );
2746                 if( is_null( $current ) ) {
2747                         # Something wrong... no page?
2748                         return array(array('notanarticle'));
2749                 }
2750
2751                 $from = str_replace( '_', ' ', $fromP );
2752                 if( $from != $current->getUserText() ) {
2753                         $resultDetails = array( 'current' => $current );
2754                         return array(array('alreadyrolled',
2755                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2756                                 htmlspecialchars($fromP),
2757                                 htmlspecialchars($current->getUserText())
2758                         ));
2759                 }
2760
2761                 # Get the last edit not by this guy
2762                 $user = intval( $current->getUser() );
2763                 $user_text = $dbw->addQuotes( $current->getUserText() );
2764                 $s = $dbw->selectRow( 'revision',
2765                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2766                         array(  'rev_page' => $current->getPage(),
2767                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2768                         ), __METHOD__,
2769                         array(  'USE INDEX' => 'page_timestamp',
2770                                 'ORDER BY'  => 'rev_timestamp DESC' )
2771                         );
2772                 if( $s === false ) {
2773                         # No one else ever edited this page
2774                         return array(array('cantrollback'));
2775                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2776                         # Only admins can see this text
2777                         return array(array('notvisiblerev'));
2778                 }
2779
2780                 $set = array();
2781                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2782                         # Mark all reverted edits as bot
2783                         $set['rc_bot'] = 1;
2784                 }
2785                 if( $wgUseRCPatrol ) {
2786                         # Mark all reverted edits as patrolled
2787                         $set['rc_patrolled'] = 1;
2788                 }
2789
2790                 if( $set ) {
2791                         $dbw->update( 'recentchanges', $set,
2792                                         array( /* WHERE */
2793                                                 'rc_cur_id' => $current->getPage(),
2794                                                 'rc_user_text' => $current->getUserText(),
2795                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2796                                         ), __METHOD__
2797                                 );
2798                 }
2799
2800                 # Generate the edit summary if necessary
2801                 $target = Revision::newFromId( $s->rev_id );
2802                 if( empty( $summary ) ){
2803                         $summary = wfMsgForContent( 'revertpage' );
2804                 }
2805
2806                 # Allow the custom summary to use the same args as the default message
2807                 $args = array(
2808                         $target->getUserText(), $from, $s->rev_id,
2809                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2810                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2811                 );
2812                 $summary = wfMsgReplaceArgs( $summary, $args );
2813
2814                 # Save
2815                 $flags = EDIT_UPDATE;
2816
2817                 if( $wgUser->isAllowed('minoredit') )
2818                         $flags |= EDIT_MINOR;
2819
2820                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2821                         $flags |= EDIT_FORCE_BOT;
2822                 # Actually store the edit
2823                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2824                 if( !empty( $status->value['revision'] ) ) {
2825                         $revId = $status->value['revision']->getId();
2826                 } else {
2827                         $revId = false;
2828                 }
2829
2830                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2831
2832                 $resultDetails = array(
2833                         'summary' => $summary,
2834                         'current' => $current,
2835                         'target' => $target,
2836                         'newid' => $revId
2837                 );
2838                 return array();
2839         }
2840
2841         /**
2842          * User interface for rollback operations
2843          */
2844         public function rollback() {
2845                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2846                 $details = null;
2847
2848                 $result = $this->doRollback(
2849                         $wgRequest->getVal( 'from' ),
2850                         $wgRequest->getText( 'summary' ),
2851                         $wgRequest->getVal( 'token' ),
2852                         $wgRequest->getBool( 'bot' ),
2853                         $details
2854                 );
2855
2856                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2857                         $wgOut->rateLimited();
2858                         return;
2859                 }
2860                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2861                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2862                         $errArray = $result[0];
2863                         $errMsg = array_shift( $errArray );
2864                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2865                         if( isset( $details['current'] ) ){
2866                                 $current = $details['current'];
2867                                 if( $current->getComment() != '' ) {
2868                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2869                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2870                                 }
2871                         }
2872                         return;
2873                 }
2874                 # Display permissions errors before read-only message -- there's no
2875                 # point in misleading the user into thinking the inability to rollback
2876                 # is only temporary.
2877                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2878                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2879                         # move any 'readonlytext' error manually.
2880                         $out = array();
2881                         foreach( $result as $error ) {
2882                                 if( $error != array( 'readonlytext' ) ) {
2883                                         $out []= $error;
2884                                 }
2885                         }
2886                         $wgOut->showPermissionsErrorPage( $out );
2887                         return;
2888                 }
2889                 if( $result == array( array( 'readonlytext' ) ) ) {
2890                         $wgOut->readOnlyPage();
2891                         return;
2892                 }
2893
2894                 $current = $details['current'];
2895                 $target = $details['target'];
2896                 $newId = $details['newid'];
2897                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2898                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2899                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2900                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2901                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2902                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2903                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2904                 $wgOut->returnToMain( false, $this->mTitle );
2905
2906                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2907                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2908                         $de->showDiff( '', '' );
2909                 }
2910         }
2911
2912
2913         /**
2914          * Do standard deferred updates after page view
2915          */
2916         public function viewUpdates() {
2917                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2918                 # Don't update page view counters on views from bot users (bug 14044)
2919                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2920                         Article::incViewCount( $this->getID() );
2921                         $u = new SiteStatsUpdate( 1, 0, 0 );
2922                         array_push( $wgDeferredUpdateList, $u );
2923                 }
2924                 # Update newtalk / watchlist notification status
2925                 $wgUser->clearNotification( $this->mTitle );
2926         }
2927
2928         /**
2929          * Prepare text which is about to be saved.
2930          * Returns a stdclass with source, pst and output members
2931          */
2932         public function prepareTextForEdit( $text, $revid=null ) {
2933                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2934                         // Already prepared
2935                         return $this->mPreparedEdit;
2936                 }
2937                 global $wgParser;
2938                 $edit = (object)array();
2939                 $edit->revid = $revid;
2940                 $edit->newText = $text;
2941                 $edit->pst = $this->preSaveTransform( $text );
2942                 $options = new ParserOptions;
2943                 $options->setTidy( true );
2944                 $options->enableLimitReport();
2945                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2946                 $edit->oldText = $this->getContent();
2947                 $this->mPreparedEdit = $edit;
2948                 return $edit;
2949         }
2950
2951         /**
2952          * Do standard deferred updates after page edit.
2953          * Update links tables, site stats, search index and message cache.
2954          * Purges pages that include this page if the text was changed here.
2955          * Every 100th edit, prune the recent changes table.
2956          *
2957          * @private
2958          * @param $text New text of the article
2959          * @param $summary Edit summary
2960          * @param $minoredit Minor edit
2961          * @param $timestamp_of_pagechange Timestamp associated with the page change
2962          * @param $newid rev_id value of the new revision
2963          * @param $changed Whether or not the content actually changed
2964          */
2965         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2966                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2967
2968                 wfProfileIn( __METHOD__ );
2969
2970                 # Parse the text
2971                 # Be careful not to double-PST: $text is usually already PST-ed once
2972                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2973                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2974                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2975                 } else {
2976                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2977                         $editInfo = $this->mPreparedEdit;
2978                 }
2979
2980                 # Save it to the parser cache
2981                 if( $wgEnableParserCache ) {
2982                         $popts = new ParserOptions;
2983                         $popts->setTidy( true );
2984                         $popts->enableLimitReport();
2985                         $parserCache = ParserCache::singleton();
2986                         $parserCache->save( $editInfo->output, $this, $popts );
2987                 }
2988
2989                 # Update the links tables
2990                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2991                 $u->doUpdate();
2992
2993                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2994
2995                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2996                         if( 0 == mt_rand( 0, 99 ) ) {
2997                                 // Flush old entries from the `recentchanges` table; we do this on
2998                                 // random requests so as to avoid an increase in writes for no good reason
2999                                 global $wgRCMaxAge;
3000                                 $dbw = wfGetDB( DB_MASTER );
3001                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3002                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3003                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3004                                 $dbw->query( $sql );
3005                         }
3006                 }
3007
3008                 $id = $this->getID();
3009                 $title = $this->mTitle->getPrefixedDBkey();
3010                 $shortTitle = $this->mTitle->getDBkey();
3011
3012                 if( 0 == $id ) {
3013                         wfProfileOut( __METHOD__ );
3014                         return;
3015                 }
3016
3017                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3018                 array_push( $wgDeferredUpdateList, $u );
3019                 $u = new SearchUpdate( $id, $title, $text );
3020                 array_push( $wgDeferredUpdateList, $u );
3021
3022                 # If this is another user's talk page, update newtalk
3023                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3024                 # load of user talk pages and piss people off, nor if it's a minor edit
3025                 # by a properly-flagged bot.
3026                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3027                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3028                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3029                                 $other = User::newFromName( $shortTitle, false );
3030                                 if( !$other ) {
3031                                         wfDebug( __METHOD__.": invalid username\n" );
3032                                 } elseif( User::isIP( $shortTitle ) ) {
3033                                         // An anonymous user
3034                                         $other->setNewtalk( true );
3035                                 } elseif( $other->isLoggedIn() ) {
3036                                         $other->setNewtalk( true );
3037                                 } else {
3038                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
3039                                 }
3040                         }
3041                 }
3042
3043                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3044                         $wgMessageCache->replace( $shortTitle, $text );
3045                 }
3046
3047                 wfProfileOut( __METHOD__ );
3048         }
3049
3050         /**
3051          * Perform article updates on a special page creation.
3052          *
3053          * @param $rev Revision object
3054          *
3055          * @todo This is a shitty interface function. Kill it and replace the
3056          * other shitty functions like editUpdates and such so it's not needed
3057          * anymore.
3058          */
3059         public function createUpdates( $rev ) {
3060                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3061                 $this->mTotalAdjustment = 1;
3062                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3063                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3064         }
3065
3066         /**
3067          * Generate the navigation links when browsing through an article revisions
3068          * It shows the information as:
3069          *   Revision as of \<date\>; view current revision
3070          *   \<- Previous version | Next Version -\>
3071          *
3072          * @param $oldid String: revision ID of this article revision
3073          */
3074         public function setOldSubtitle( $oldid = 0 ) {
3075                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3076
3077                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3078                         return;
3079                 }
3080
3081                 $revision = Revision::newFromId( $oldid );
3082
3083                 $current = ( $oldid == $this->mLatest );
3084                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3085                 $tddate = $wgLang->time( $this->mTimestamp, true );
3086                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3087                 $sk = $wgUser->getSkin();
3088                 $lnk = $current
3089                         ? wfMsgHtml( 'currentrevisionlink' )
3090                         : $sk->link(
3091                                 $this->mTitle,
3092                                 wfMsgHtml( 'currentrevisionlink' ),
3093                                 array(),
3094                                 array(),
3095                                 array( 'known', 'noclasses' )
3096                         );
3097                 $curdiff = $current
3098                         ? wfMsgHtml( 'diff' )
3099                         : $sk->link(
3100                                 $this->mTitle,
3101                                 wfMsgHtml( 'diff' ),
3102                                 array(),
3103                                 array(
3104                                         'diff' => 'cur',
3105                                         'oldid' => $oldid
3106                                 ),
3107                                 array( 'known', 'noclasses' )
3108                         );
3109                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3110                 $prevlink = $prev
3111                         ? $sk->link(
3112                                 $this->mTitle,
3113                                 wfMsgHtml( 'previousrevision' ),
3114                                 array(),
3115                                 array(
3116                                         'direction' => 'prev',
3117                                         'oldid' => $oldid
3118                                 ),
3119                                 array( 'known', 'noclasses' )
3120                         )
3121                         : wfMsgHtml( 'previousrevision' );
3122                 $prevdiff = $prev
3123                         ? $sk->link(
3124                                 $this->mTitle,
3125                                 wfMsgHtml( 'diff' ),
3126                                 array(),
3127                                 array(
3128                                         'diff' => 'prev',
3129                                         'oldid' => $oldid
3130                                 ),
3131                                 array( 'known', 'noclasses' )
3132                         )
3133                         : wfMsgHtml( 'diff' );
3134                 $nextlink = $current
3135                         ? wfMsgHtml( 'nextrevision' )
3136                         : $sk->link(
3137                                 $this->mTitle,
3138                                 wfMsgHtml( 'nextrevision' ),
3139                                 array(),
3140                                 array(
3141                                         'direction' => 'next',
3142                                         'oldid' => $oldid
3143                                 ),
3144                                 array( 'known', 'noclasses' )
3145                         );
3146                 $nextdiff = $current
3147                         ? wfMsgHtml( 'diff' )
3148                         : $sk->link(
3149                                 $this->mTitle,
3150                                 wfMsgHtml( 'diff' ),
3151                                 array(),
3152                                 array(
3153                                         'diff' => 'next',
3154                                         'oldid' => $oldid
3155                                 ),
3156                                 array( 'known', 'noclasses' )
3157                         );
3158
3159                 $cdel='';
3160                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3161                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3162                         if( $revision->isCurrent() ) {
3163                         // We don't handle top deleted edits too well
3164                                 $cdel = wfMsgHtml( 'rev-delundel' );
3165                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3166                         // If revision was hidden from sysops
3167                                 $cdel = wfMsgHtml( 'rev-delundel' );
3168                         } else {
3169                                 $cdel = $sk->link(
3170                                         $revdel,
3171                                         wfMsgHtml('rev-delundel'),
3172                                         array(),
3173                                         array(
3174                                                 'type' => 'revision',
3175                                                 'target' => urlencode( $this->mTitle->getPrefixedDbkey() ),
3176                                                 'ids' => urlencode( $oldid )
3177                                         ),
3178                                         array( 'known', 'noclasses' )
3179                                 );
3180                                 // Bolden oversighted content
3181                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3182                                         $cdel = "<strong>$cdel</strong>";
3183                         }
3184                         $cdel = "(<small>$cdel</small>) ";
3185                 }
3186                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3187                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3188                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3189
3190                 $m = wfMsg( 'revision-info-current' );
3191                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3192                         ? 'revision-info-current'
3193                         : 'revision-info';
3194
3195                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3196                         wfMsgExt(
3197                                 $infomsg,
3198                                 array( 'parseinline', 'replaceafter' ),
3199                                 $td,
3200                                 $userlinks,
3201                                 $revision->getID(),
3202                                 $tddate,
3203                                 $tdtime
3204                         ) .
3205                         "</div>\n" .
3206                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3207                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3208                 $wgOut->setSubtitle( $r );
3209         }
3210
3211         /**
3212          * This function is called right before saving the wikitext,
3213          * so we can do things like signatures and links-in-context.
3214          *
3215          * @param $text String
3216          */
3217         public function preSaveTransform( $text ) {
3218                 global $wgParser, $wgUser;
3219                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3220         }
3221
3222         /* Caching functions */
3223
3224         /**
3225          * checkLastModified returns true if it has taken care of all
3226          * output to the client that is necessary for this request.
3227          * (that is, it has sent a cached version of the page)
3228          */
3229         protected function tryFileCache() {
3230                 static $called = false;
3231                 if( $called ) {
3232                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3233                         return false;
3234                 }
3235                 $called = true;
3236                 if( $this->isFileCacheable() ) {
3237                         $cache = new HTMLFileCache( $this->mTitle );
3238                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3239                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3240                                 $cache->loadFromFileCache();
3241                                 return true;
3242                         } else {
3243                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3244                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3245                         }
3246                 } else {
3247                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3248                 }
3249                 return false;
3250         }
3251
3252         /**
3253          * Check if the page can be cached
3254          * @return bool
3255          */
3256         public function isFileCacheable() {
3257                 $cacheable = false;
3258                 if( HTMLFileCache::useFileCache() ) {
3259                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3260                         // Extension may have reason to disable file caching on some pages.
3261                         if( $cacheable ) {
3262                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3263                         }
3264                 }
3265                 return $cacheable;
3266         }
3267
3268         /**
3269          * Loads page_touched and returns a value indicating if it should be used
3270          *
3271          */
3272         public function checkTouched() {
3273                 if( !$this->mDataLoaded ) {
3274                         $this->loadPageData();
3275                 }
3276                 return !$this->mIsRedirect;
3277         }
3278
3279         /**
3280          * Get the page_touched field
3281          */
3282         public function getTouched() {
3283                 # Ensure that page data has been loaded
3284                 if( !$this->mDataLoaded ) {
3285                         $this->loadPageData();
3286                 }
3287                 return $this->mTouched;
3288         }
3289
3290         /**
3291          * Get the page_latest field
3292          */
3293         public function getLatest() {
3294                 if( !$this->mDataLoaded ) {
3295                         $this->loadPageData();
3296                 }
3297                 return (int)$this->mLatest;
3298         }
3299
3300         /**
3301          * Edit an article without doing all that other stuff
3302          * The article must already exist; link tables etc
3303          * are not updated, caches are not flushed.
3304          *
3305          * @param $text String: text submitted
3306          * @param $comment String: comment submitted
3307          * @param $minor Boolean: whereas it's a minor modification
3308          */
3309         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3310                 wfProfileIn( __METHOD__ );
3311
3312                 $dbw = wfGetDB( DB_MASTER );
3313                 $revision = new Revision( array(
3314                         'page'       => $this->getId(),
3315                         'text'       => $text,
3316                         'comment'    => $comment,
3317                         'minor_edit' => $minor ? 1 : 0,
3318                         ) );
3319                 $revision->insertOn( $dbw );
3320                 $this->updateRevisionOn( $dbw, $revision );
3321
3322                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3323
3324                 wfProfileOut( __METHOD__ );
3325         }
3326
3327         /**
3328          * Used to increment the view counter
3329          *
3330          * @param $id Integer: article id
3331          */
3332         public static function incViewCount( $id ) {
3333                 $id = intval( $id );
3334                 global $wgHitcounterUpdateFreq, $wgDBtype;
3335
3336                 $dbw = wfGetDB( DB_MASTER );
3337                 $pageTable = $dbw->tableName( 'page' );
3338                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3339                 $acchitsTable = $dbw->tableName( 'acchits' );
3340
3341                 if( $wgHitcounterUpdateFreq <= 1 ) {
3342                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3343                         return;
3344                 }
3345
3346                 # Not important enough to warrant an error page in case of failure
3347                 $oldignore = $dbw->ignoreErrors( true );
3348
3349                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3350
3351                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3352                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3353                         # Most of the time (or on SQL errors), skip row count check
3354                         $dbw->ignoreErrors( $oldignore );
3355                         return;
3356                 }
3357
3358                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3359                 $row = $dbw->fetchObject( $res );
3360                 $rown = intval( $row->n );
3361                 if( $rown >= $wgHitcounterUpdateFreq ){
3362                         wfProfileIn( 'Article::incViewCount-collect' );
3363                         $old_user_abort = ignore_user_abort( true );
3364
3365                         if($wgDBtype == 'mysql')
3366                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3367                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3368                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3369                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3370                                 'GROUP BY hc_id');
3371                         $dbw->query("DELETE FROM $hitcounterTable");
3372                         if($wgDBtype == 'mysql') {
3373                                 $dbw->query('UNLOCK TABLES');
3374                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3375                                         'WHERE page_id = hc_id');
3376                         }
3377                         else {
3378                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3379                                         "FROM $acchitsTable WHERE page_id = hc_id");
3380                         }
3381                         $dbw->query("DROP TABLE $acchitsTable");
3382
3383                         ignore_user_abort( $old_user_abort );
3384                         wfProfileOut( 'Article::incViewCount-collect' );
3385                 }
3386                 $dbw->ignoreErrors( $oldignore );
3387         }
3388
3389         /**#@+
3390          * The onArticle*() functions are supposed to be a kind of hooks
3391          * which should be called whenever any of the specified actions
3392          * are done.
3393          *
3394          * This is a good place to put code to clear caches, for instance.
3395          *
3396          * This is called on page move and undelete, as well as edit
3397          *
3398          * @param $title a title object
3399          */
3400
3401         public static function onArticleCreate( $title ) {
3402                 # Update existence markers on article/talk tabs...
3403                 if( $title->isTalkPage() ) {
3404                         $other = $title->getSubjectPage();
3405                 } else {
3406                         $other = $title->getTalkPage();
3407                 }
3408                 $other->invalidateCache();
3409                 $other->purgeSquid();
3410
3411                 $title->touchLinks();
3412                 $title->purgeSquid();
3413                 $title->deleteTitleProtection();
3414         }
3415
3416         public static function onArticleDelete( $title ) {
3417                 global $wgMessageCache;
3418                 # Update existence markers on article/talk tabs...
3419                 if( $title->isTalkPage() ) {
3420                         $other = $title->getSubjectPage();
3421                 } else {
3422                         $other = $title->getTalkPage();
3423                 }
3424                 $other->invalidateCache();
3425                 $other->purgeSquid();
3426
3427                 $title->touchLinks();
3428                 $title->purgeSquid();
3429
3430                 # File cache
3431                 HTMLFileCache::clearFileCache( $title );
3432
3433                 # Messages
3434                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3435                         $wgMessageCache->replace( $title->getDBkey(), false );
3436                 }
3437                 # Images
3438                 if( $title->getNamespace() == NS_FILE ) {
3439                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3440                         $update->doUpdate();
3441                 }
3442                 # User talk pages
3443                 if( $title->getNamespace() == NS_USER_TALK ) {
3444                         $user = User::newFromName( $title->getText(), false );
3445                         $user->setNewtalk( false );
3446                 }
3447                 # Image redirects
3448                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3449         }
3450
3451         /**
3452          * Purge caches on page update etc
3453          */
3454         public static function onArticleEdit( $title, $flags = '' ) {
3455                 global $wgDeferredUpdateList;
3456
3457                 // Invalidate caches of articles which include this page
3458                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3459
3460                 // Invalidate the caches of all pages which redirect here
3461                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3462
3463                 # Purge squid for this page only
3464                 $title->purgeSquid();
3465
3466                 # Clear file cache for this page only
3467                 HTMLFileCache::clearFileCache( $title );
3468         }
3469
3470         /**#@-*/
3471
3472         /**
3473          * Overriden by ImagePage class, only present here to avoid a fatal error
3474          * Called for ?action=revert
3475          */
3476         public function revert() {
3477                 global $wgOut;
3478                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3479         }
3480
3481         /**
3482          * Info about this page
3483          * Called for ?action=info when $wgAllowPageInfo is on.
3484          */
3485         public function info() {
3486                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3487
3488                 if( !$wgAllowPageInfo ) {
3489                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3490                         return;
3491                 }
3492
3493                 $page = $this->mTitle->getSubjectPage();
3494
3495                 $wgOut->setPagetitle( $page->getPrefixedText() );
3496                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3497                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3498
3499                 if( !$this->mTitle->exists() ) {
3500                         $wgOut->addHTML( '<div class="noarticletext">' );
3501                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3502                                 // This doesn't quite make sense; the user is asking for
3503                                 // information about the _page_, not the message... -- RC
3504                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3505                         } else {
3506                                 $msg = $wgUser->isLoggedIn()
3507                                         ? 'noarticletext'
3508                                         : 'noarticletextanon';
3509                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3510                         }
3511                         $wgOut->addHTML( '</div>' );
3512                 } else {
3513                         $dbr = wfGetDB( DB_SLAVE );
3514                         $wl_clause = array(
3515                                 'wl_title'     => $page->getDBkey(),
3516                                 'wl_namespace' => $page->getNamespace() );
3517                         $numwatchers = $dbr->selectField(
3518                                 'watchlist',
3519                                 'COUNT(*)',
3520                                 $wl_clause,
3521                                 __METHOD__,
3522                                 $this->getSelectOptions() );
3523
3524                         $pageInfo = $this->pageCountInfo( $page );
3525                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3526
3527                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3528                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3529                         if( $talkInfo ) {
3530                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3531                         }
3532                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3533                         if( $talkInfo ) {
3534                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3535                         }
3536                         $wgOut->addHTML( '</ul>' );
3537                 }
3538         }
3539
3540         /**
3541          * Return the total number of edits and number of unique editors
3542          * on a given page. If page does not exist, returns false.
3543          *
3544          * @param $title Title object
3545          * @return array
3546          */
3547         public function pageCountInfo( $title ) {
3548                 $id = $title->getArticleId();
3549                 if( $id == 0 ) {
3550                         return false;
3551                 }
3552                 $dbr = wfGetDB( DB_SLAVE );
3553                 $rev_clause = array( 'rev_page' => $id );
3554                 $edits = $dbr->selectField(
3555                         'revision',
3556                         'COUNT(rev_page)',
3557                         $rev_clause,
3558                         __METHOD__,
3559                         $this->getSelectOptions()
3560                 );
3561                 $authors = $dbr->selectField(
3562                         'revision',
3563                         'COUNT(DISTINCT rev_user_text)',
3564                         $rev_clause,
3565                         __METHOD__,
3566                         $this->getSelectOptions()
3567                 );
3568                 return array( 'edits' => $edits, 'authors' => $authors );
3569         }
3570
3571         /**
3572          * Return a list of templates used by this article.
3573          * Uses the templatelinks table
3574          *
3575          * @return Array of Title objects
3576          */
3577         public function getUsedTemplates() {
3578                 $result = array();
3579                 $id = $this->mTitle->getArticleID();
3580                 if( $id == 0 ) {
3581                         return array();
3582                 }
3583                 $dbr = wfGetDB( DB_SLAVE );
3584                 $res = $dbr->select( array( 'templatelinks' ),
3585                         array( 'tl_namespace', 'tl_title' ),
3586                         array( 'tl_from' => $id ),
3587                         __METHOD__ );
3588                 if( $res !== false ) {
3589                         foreach( $res as $row ) {
3590                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3591                         }
3592                 }
3593                 $dbr->freeResult( $res );
3594                 return $result;
3595         }
3596
3597         /**
3598          * Returns a list of hidden categories this page is a member of.
3599          * Uses the page_props and categorylinks tables.
3600          *
3601          * @return Array of Title objects
3602          */
3603         public function getHiddenCategories() {
3604                 $result = array();
3605                 $id = $this->mTitle->getArticleID();
3606                 if( $id == 0 ) {
3607                         return array();
3608                 }
3609                 $dbr = wfGetDB( DB_SLAVE );
3610                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3611                         array( 'cl_to' ),
3612                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3613                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3614                         __METHOD__ );
3615                 if( $res !== false ) {
3616                         foreach( $res as $row ) {
3617                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3618                         }
3619                 }
3620                 $dbr->freeResult( $res );
3621                 return $result;
3622         }
3623
3624         /**
3625         * Return an applicable autosummary if one exists for the given edit.
3626         * @param $oldtext String: the previous text of the page.
3627         * @param $newtext String: The submitted text of the page.
3628         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3629         * @return string An appropriate autosummary, or an empty string.
3630         */
3631         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3632                 # Decide what kind of autosummary is needed.
3633
3634                 # Redirect autosummaries
3635                 $ot = Title::newFromRedirect( $oldtext );
3636                 $rt = Title::newFromRedirect( $newtext );
3637                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3638                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3639                 }
3640
3641                 # New page autosummaries
3642                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3643                         # If they're making a new article, give its text, truncated, in the summary.
3644                         global $wgContLang;
3645                         $truncatedtext = $wgContLang->truncate(
3646                                 str_replace("\n", ' ', $newtext),
3647                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3648                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3649                 }
3650
3651                 # Blanking autosummaries
3652                 if( $oldtext != '' && $newtext == '' ) {
3653                         return wfMsgForContent( 'autosumm-blank' );
3654                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3655                         # Removing more than 90% of the article
3656                         global $wgContLang;
3657                         $truncatedtext = $wgContLang->truncate(
3658                                 $newtext,
3659                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3660                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3661                 }
3662
3663                 # If we reach this point, there's no applicable autosummary for our case, so our
3664                 # autosummary is empty.
3665                 return '';
3666         }
3667
3668         /**
3669          * Add the primary page-view wikitext to the output buffer
3670          * Saves the text into the parser cache if possible.
3671          * Updates templatelinks if it is out of date.
3672          *
3673          * @param $text String
3674          * @param $cache Boolean
3675          */
3676         public function outputWikiText( $text, $cache = true ) {
3677                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3678
3679                 $popts = $wgOut->parserOptions();
3680                 $popts->setTidy(true);
3681                 $popts->enableLimitReport();
3682                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3683                         $popts, true, true, $this->getRevIdFetched() );
3684                 $popts->setTidy(false);
3685                 $popts->enableLimitReport( false );
3686                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3687                         $parserCache = ParserCache::singleton();
3688                         $parserCache->save( $parserOutput, $this, $popts );
3689                 }
3690                 // Make sure file cache is not used on uncacheable content.
3691                 // Output that has magic words in it can still use the parser cache
3692                 // (if enabled), though it will generally expire sooner.
3693                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3694                         $wgUseFileCache = false;
3695                 }
3696
3697                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3698                         // templatelinks table may have become out of sync,
3699                         // especially if using variable-based transclusions.
3700                         // For paranoia, check if things have changed and if
3701                         // so apply updates to the database. This will ensure
3702                         // that cascaded protections apply as soon as the changes
3703                         // are visible.
3704
3705                         # Get templates from templatelinks
3706                         $id = $this->mTitle->getArticleID();
3707
3708                         $tlTemplates = array();
3709
3710                         $dbr = wfGetDB( DB_SLAVE );
3711                         $res = $dbr->select( array( 'templatelinks' ),
3712                                 array( 'tl_namespace', 'tl_title' ),
3713                                 array( 'tl_from' => $id ),
3714                                 __METHOD__ );
3715
3716                         global $wgContLang;
3717                         foreach( $res as $row ) {
3718                                 $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3719                         }
3720
3721                         # Get templates from parser output.
3722                         $poTemplates = array();
3723                         foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3724                                 foreach ( $templates as $dbk => $id ) {
3725                                         $poTemplates["$ns:$dbk"] = true;
3726                                 }
3727                         }
3728
3729                         # Get the diff
3730                         # Note that we simulate array_diff_key in PHP <5.0.x
3731                         $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3732
3733                         if( count( $templates_diff ) > 0 ) {
3734                                 # Whee, link updates time.
3735                                 $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3736                                 $u->doUpdate();
3737                         }
3738                 }
3739
3740                 $wgOut->addParserOutput( $parserOutput );
3741         }
3742
3743         /**
3744          * Update all the appropriate counts in the category table, given that
3745          * we've added the categories $added and deleted the categories $deleted.
3746          *
3747          * @param $added array   The names of categories that were added
3748          * @param $deleted array The names of categories that were deleted
3749          * @return null
3750          */
3751         public function updateCategoryCounts( $added, $deleted ) {
3752                 $ns = $this->mTitle->getNamespace();
3753                 $dbw = wfGetDB( DB_MASTER );
3754
3755                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3756                 # exist, we might legitimately not create it, but it's simpler to just
3757                 # create it and then give it a negative value, since the value is bogus
3758                 # anyway.
3759                 #
3760                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3761                 $insertCats = array_merge( $added, $deleted );
3762                 if( !$insertCats ) {
3763                         # Okay, nothing to do
3764                         return;
3765                 }
3766                 $insertRows = array();
3767                 foreach( $insertCats as $cat ) {
3768                         $insertRows[] = array( 'cat_title' => $cat );
3769                 }
3770                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3771
3772                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3773                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3774                 if( $ns == NS_CATEGORY ) {
3775                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3776                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3777                 } elseif( $ns == NS_FILE ) {
3778                         $addFields[]    = 'cat_files = cat_files + 1';
3779                         $removeFields[] = 'cat_files = cat_files - 1';
3780                 }
3781
3782                 if( $added ) {
3783                         $dbw->update(
3784                                 'category',
3785                                 $addFields,
3786                                 array( 'cat_title' => $added ),
3787                                 __METHOD__
3788                         );
3789                 }
3790                 if( $deleted ) {
3791                         $dbw->update(
3792                                 'category',
3793                                 $removeFields,
3794                                 array( 'cat_title' => $deleted ),
3795                                 __METHOD__
3796                         );
3797                 }
3798         }
3799 }