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