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