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